Update README.md (#560)

Added Golang library that supports both v1 and v2, and passes kdl-rs and kdl-test.

.editorconfig

@@ -0,0 +1,8 @@
+# See http://editorconfig.org
+
+root = true
+
+[*.{md,xml,org}]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true

.github/workflows/ghpages.yml

@@ -0,0 +1,60 @@
+name: "Update Editor's Copy"
+
+on:
+  push:
+    paths-ignore:
+    - README.md
+    - CONTRIBUTING.md
+    - LICENSE.md
+    - .gitignore
+  pull_request:
+    paths-ignore:
+    - README.md
+    - CONTRIBUTING.md
+    - LICENSE.md
+    - .gitignore
+
+jobs:
+  build:
+    name: "Update Editor's Copy"
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+    - name: "Checkout"
+      uses: actions/checkout@v4
+
+    - name: "Setup"
+      id: setup
+      run: date -u "+date=%FT%T" >>"$GITHUB_OUTPUT"
+
+    - name: "Caching"
+      uses: actions/cache@v4
+      with:
+        path: |
+          .refcache
+          .venv
+          .gems
+          node_modules
+          .targets.mk
+        key: i-d-${{ steps.setup.outputs.date }}
+        restore-keys: i-d-
+
+    - name: "Build Drafts"
+      uses: martinthomson/i-d-template@v1
+      with:
+        token: ${{ github.token }}
+
+    - name: "Update GitHub Pages"
+      uses: martinthomson/i-d-template@v1
+      if: ${{ github.event_name == 'push' }}
+      with:
+        make: gh-pages
+        token: ${{ github.token }}
+
+    - name: "Archive Built Drafts"
+      uses: actions/upload-artifact@v4
+      with:
+        path: |
+          draft-*.html
+          draft-*.txt

.github/workflows/lint-tests.yml

@@ -0,0 +1,25 @@
+name: Lint the test files
+
+on:
+  push:
+    paths:
+      - "tests/**"
+  pull_request:
+    paths:
+      - "tests/**"
+  workflow_dispatch: {}
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.10'
+    - name: Verify failing tests and orphaned tests
+      run: |
+        cd tests/test_cases
+        python ../../.github/workflows/lint-tests/lint.py

.github/workflows/lint-tests/lint.py

@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import os
+import sys
+import typing
+
+def findTestFiles(path) -> typing.Generator[str, None, None]:
+    for root, _, filenames in os.walk(path):
+        for filename in filenames:
+            yield os.path.join(root, filename)
+
+# strip the leading folder name, so they can be directly compared
+inputFiles = set(x[len("input")+1:] for x in findTestFiles("input"))
+validFiles = set(x[len("expected_kdl")+1:] for x in findTestFiles("expected_kdl"))
+
+invalidFiles = inputFiles - validFiles
+orphanedFiles = validFiles - inputFiles
+
+SUCCESS = True
+
+# Check for any expected_kdl files without a corresponding input file.
+if orphanedFiles:
+	SUCCESS = False
+	print("ERROR: There are outputs in /expected_kdl without corresponding tests in /input:\n" + "\n".join(["  "+x for x in orphanedFiles]))
+
+# Check for any input files lacking an expected_kdl file
+# (aka inputs expected to generate a parse error)
+# that don't have a _fail suffix.
+misnamedFiles: list[str] = []
+for filepath in invalidFiles:
+	basepath, ext = os.path.splitext(filepath)
+	if not basepath.endswith("_fail"):
+		misnamedFiles.append(filepath)
+if misnamedFiles:
+	SUCCESS = False
+	print("ERROR: There are tests in /input without corresponding outputs in /expected_kdl, but they don't have a _fail suffix:\n" + "\n".join(["  "+x for x in misnamedFiles]))
+
+# Check for any expected_kdl files that don't end in a newline.
+noNewlineFiles: list[str] = []
+for filepath in validFiles:
+	with open("expected_kdl/" + filepath, "r", encoding="utf-8") as fh:
+		text = fh.read()
+		if not text.endswith("\n"):
+			noNewlineFiles.append(filepath)
+if noNewlineFiles:
+	SUCCESS = False
+	print("ERROR: There are outputs in /expected_kdl that don't end with a newline:\n" + "\n".join(["  "+x for x in noNewlineFiles]))
+
+if not SUCCESS:
+	sys.exit(1)

.github/workflows/publish.yml

@@ -0,0 +1,57 @@
+name: "Publish New Draft Version"
+
+on:
+  push:
+    tags:
+      - "draft-*"
+  workflow_dispatch:
+    inputs:
+      email:
+        description: "Submitter email"
+        default: ""
+        type: string
+
+jobs:
+  build:
+    name: "Publish New Draft Version"
+    runs-on: ubuntu-latest
+    steps:
+    - name: "Checkout"
+      uses: actions/checkout@v4
+
+    # See https://github.com/actions/checkout/issues/290
+    - name: "Get Tag Annotations"
+      run: git fetch -f origin ${{ github.ref }}:${{ github.ref }}
+
+    - name: "Setup"
+      id: setup
+      run: date -u "+date=%FT%T" >>"$GITHUB_OUTPUT"
+
+    - name: "Caching"
+      uses: actions/cache@v4
+      with:
+        path: |
+          .refcache
+          .venv
+          .gems
+          node_modules
+          .targets.mk
+        key: i-d-${{ steps.setup.outputs.date }}
+        restore-keys: i-d-
+
+    - name: "Build Drafts"
+      uses: martinthomson/i-d-template@v1
+      with:
+        token: ${{ github.token }}
+
+    - name: "Upload to Datatracker"
+      uses: martinthomson/i-d-template@v1
+      with:
+        make: upload
+      env:
+        UPLOAD_EMAIL: ${{ inputs.email }}
+
+    - name: "Archive Submitted Drafts"
+      uses: actions/upload-artifact@v4
+      with:
+        path: "versioned/draft-*-[0-9][0-9].*"

.gitignore

@@ -1,2 +1,25 @@
 /target
 Cargo.lock
+*.html
+*.pdf
+*.redxml
+*.swp
+*.txt
+*.upload
+*~
+.tags
+/*-[0-9][0-9].xml
+/.*.mk
+/.gems/
+/.refcache
+/.venv/
+/.vscode/
+/lib
+/node_modules/
+/versioned/
+Gemfile.lock
+archive.json
+draft-marchan-kdl2.xml
+package-lock.json
+report.xml
+!requirements.txt

.note.xml

@@ -0,0 +1,4 @@
+<note title="Discussion Venues" removeInRFC="true">
+<t>Source for this draft and an issue tracker can be found at
+    <eref target="https://github.com/kdl-org/kdl"/>.</t>
+</note>

CHANGELOG.md

@@ -1,6 +1,6 @@
 # KDL Changelog
 
-## 2.0.0 (2022-08-28)
+## 2.0.0 (2024-12-21)
 
 ### Grammar
 
@@ -9,14 +9,15 @@
   escape.
 * Single line comments (`//`) can now be immediately followed by a newline.
 * All literal whitespace following a `\` in a string is now discarded.
-* Vertical tabs (`U+000B`) are now considered to be whitespace.
+* Vertical tabs (`U+000B`) are now considered to be newlines.
 * The grammar syntax itself has been described, and some confusing definitions
   in the grammar have been fixed accordingly (mostly related to escaped
   characters).
 * `,`, `<`, and `>` are now legal identifier characters. They were previously
   reserved for KQL but this is no longer necessary.
-* Code points under `0x20`, code points above `0x10FFFF`, Delete control
-  character (`0x7F`), and the [unicode "direction control"
+* Code points under `0x20` (except newline and whitespace code points), code
+  points above `0x10FFFF`, Delete control character (`0x7F`), and the [unicode
+  "direction control"
   characters](https://www.w3.org/International/questions/qa-bidi-unicode-controls)
   are now completely banned from appearing literally in KDL documents. They
   can now only be represented in regular strings, and there's no facilities to
@@ -24,6 +25,7 @@
   improvement.
 * Raw strings no longer require an `r` prefix: they are now specified by using
   `#""#`.
+* Raw string productions are now explicitly non-greedy (and "fallible").
 * Line continuations can be followed by an EOF now, instead of requiring a
   newline (or comment). `node \<EOF>` is now a legal KDL document.
 * `#` is no longer a legal identifier character.
@@ -35,7 +37,7 @@
 * Bare identifiers can now be used as values in Arguments and Properties, and are interpreted as string values.
 * The spec prose now more explicitly states that strings and raw strings can
   be used as type annotations.
-* A statement in the spec prose that said "It is reasonable for an
+* Removed a statement in the spec prose that said "It is reasonable for an
   implementation to ignore null values altogether when deserializing". This is
   no longer encouraged or desired.
 * Code points have been constrained to [Unicode Scalar
@@ -44,7 +46,7 @@
   should be valid UTF-8 now, as was intended.
 * The last node in a child block no longer needs to be terminated with `;`,
   even if the closing `}` is on the same line, so this is now a legal node:
-  `node {foo;bar;baz}`
+  `node{foo;bar;baz}`
 * More places allow whitespace (node-spaces, specifically) now. With great
   power comes great responsibility:
   * Inside `(foo)` annotations (so, `( foo )` would be legal (`( f oo )` would
@@ -54,21 +56,89 @@
   * Around `=` for props (`x = 1`)
 * The BOM is now only allowed as the first character in a document. It was
   previously treated as generic whitespace.
-* Multi-line strings are now automatically dedented, according to the
-  least-indented line in the body. Multiline strings and raw strings now must
-  have a newline immediately following their opening `"`, and a final newline
-  preceding the closing `"`.
-* SMALL EQUALS SIGN (`U+FE66`), FULLWIDTH EQUALS SIGN (`U+FF1D`), and HEAVY
-  EQUALS SIGN (`U+1F7F0`) are now treated the same as `=` and can be used for
-  properties (e.g. `お名前＝☜(ﾟヮﾟ☜)`). They are also no longer valid in bare
-  identifiers.
+* Multi-line strings must now use `"""` as delimiters. The opening delimiter must be immediately followed by a newline, and the closing delimiter must be on its own line, prefixed by optional whitespace.
+* Multi-line strings are now automatically dedented, according to the common
+  whitespace matching the whitespace prefix of the closing line.
 * `.1`, `+.1` etc are no longer valid identifiers, to prevent confusion and
   conflicts with numbers.
+* Multi-line strings' literal Newline sequences are now normalized to single
+  `LF`s.
+* `#inf`, `#-inf`, and `#nan` have been added in order to properly support
+  IEEE floats for implementations that choose to represent their decimals that
+  way.
+* Correspondingly, the identifiers `inf`, `-inf`, and `nan` are now syntax
+  errors.
+* `u128` and `i128` have been added as well-known number type annotations.
+* Slashdash (`/-`) -compatible locations adjusted to be more clear and
+  intuitive. They can now be used in exactly three different places: before nodes,
+  before entire entries, or before entire child blocks.
+* Furthermore, The ordering of slashdashed elements has been restricted such
+  that a slashdashed child block cannot go before an entry (including slashdashed
+  entries).
+* Optional version marker `/- kdl-version 2` (or `1`) as the first line in a document, optionally preceded by the BOM.
 
 ### KQL
 
+> [!INFO] Note: these are provided for convenience, but as of the 2.0.0 KDL spec release,
+> KQL itself is not finalized and should be considered a separate specification,
+> alongside the Schema spec and others.
+
 * There's now a _required_ descendant selector (`>>`), instead of using plain
   spaces for that purpose.
 * The "any sibling" selector is now `++` instead of `~`, for consistency with
   the new descendant selector.
+* Some parsing logic around the grammar has changed.
+* Multi- and single-line comments are now supported, as well as line
+  continuations with `\`.
 * Map operators have been removed entirely.
+
+---
+
+## 2.0.0 Draft Changelogs
+
+### 2.0.0-draft.8 (2024-12-14)
+
+* Some details have been clarified around the treatment of whitespace in
+  multiline strings.
+* `raw-string` productions have been updated to be explicitly non-greedy and
+  "fallible".
+* Some tests have been added, others adjusted, some removed, after a cleanup pass.
+
+
+### 2.0.0-draft.7 (2024-12-10)
+
+* `node-space` is now allowed as whitespace after a `slashdash`, meaning line
+  continuations will work now.
+* One or two consecutive double-quotes are now allowed in the bodies of
+  multi-line quoted strings, without needing to be escaped.
+* Grammar has been fixed to disallow raw strings like `#"""#`, which are now
+  properly treated as invalid multi-line raw strings (instead of the equivalent of
+  `"\""`).
+* Test suite has been updated to include a `_fail` suffix in all test cases
+  which are expected to fail.
+* A slew of additional slashdash and multi-line string compliance tests have
+  been added. Have fun. :)
+* The organization of string types in the spec prose has been updated to a
+  hopefully more helpful structure.
+
+
+### 2.0.0-draft.6 (2024-12-04)
+
+* Multiline strings, both Raw and Quoted, must now use `"""` instead of a single `"`. Using `"""` for a single-line string is a syntax error.
+* Fixed an issue with the `unicode_silly` test case.
+* Some rewordings and clarification in the spec prose.
+* Slight grammar tweak where the pre-terminator `node-space*` for `node` and `final-node` have been moved into `base-node`.
+
+
+### 2.0.0-draft.5 (2024-11-28)
+
+* Equals signs other than `=` are no longer supported in properties.
+* 128-bit integer type annotations have been added to the list of "well-known"
+  type annotations.
+* Multiline string escape rules have been tweaked significantly.
+* `\s` is now a valid escape within a string, representing a space character.
+* Slashdash (`/-`)-compatible locations and related grammar adjusted to be more
+  clear and intuitive. This includes some changes relating to whitespace,
+  including comments and newlines, which are breaking changes.
+* Various updates to test suite to reflect changes.
+

CONTRIBUTING.md

@@ -0,0 +1,22 @@
+# Contributing
+
+## Mechanics
+
+Contributions can be made by creating pull requests.
+The GitHub interface supports creating pull requests using the Edit (✏) button.
+
+
+## Building the Specification
+
+The specification is written in
+[kramdown-rfc](https://github.com/cabo/kramdown-rfc/wiki/Syntax2), which
+compiles via [RFCXML](https://authors.ietf.org/rfcxml-vocabulary) to text and
+HTML.
+
+You can build the formatted versions or the intermediate RFCXML file using
+https://author-tools.ietf.org/ or locally by running `make`. To preserve the
+intermediate RFCXML form in a local build, run `make draft-marchan-kdl2.xml`
+once.
+
+Command line usage requires that you have the necessary software installed.  See
+[the instructions](https://github.com/martinthomson/i-d-template/blob/main/doc/SETUP.md).

JSON-IN-KDL.md

@@ -98,7 +98,7 @@ The properties and/or children of the node represent the items of the object,
 with the property names and child nodenames as each item's key.
 All "keys" in an object node must be unique.
 
-As with arrays, there are two ambiguous cases that must be manually annoted with the `(object)` type annotation:
+As with arrays, there are two ambiguous cases that must be manually annotated with the `(object)` type annotation:
 
 * An object containing a single item whose key is "-" (like `{"-": 1}`) written using children (like `- { - 1 }`)
 	would be ambiguous with an array node.

Makefile

@@ -0,0 +1,15 @@
+LIBDIR := lib
+include $(LIBDIR)/main.mk
+
+$(LIBDIR)/main.mk:
+ifneq (,$(shell grep "path *= *$(LIBDIR)" .gitmodules 2>/dev/null))
+	git submodule sync
+	git submodule update --init
+else
+ifneq (,$(wildcard $(ID_TEMPLATE_HOME)))
+	ln -s "$(ID_TEMPLATE_HOME)" $(LIBDIR)
+else
+	git clone -q --depth 10 -b main \
+	    https://github.com/martinthomson/i-d-template $(LIBDIR)
+endif
+endif

QUERY-SPEC.md

@@ -30,6 +30,11 @@ properties, node names, etc). With the exception of `top()` and `()`, they are a
 used inside a `[]` selector. Some matchers are unary, but most of them involve
 binary operators.
 
+The `top()` matcher can only be used as the first matcher of a selector. This means
+that it cannot be the right operand of the `>`, `>>`, `+`, or `++` operators. As `||`
+combines selectors, the `top()` can appear just after it. For instance,
+ `a > b || top() > b` is valid, but `a > top()` is not.
+
 * `top()`: Returns all toplevel children of the current document.
 * `top() > []`: Equivalent to `top()` on its own.
 * `(foo)`: Selects any element whose type annotation is `foo`.
@@ -104,18 +109,23 @@ Then the following queries are valid:
 
 ## Full Grammar
 
-For rules that are not defined in this grammar, see [the KDL grammar](https://github.com/kdl-org/kdl/blob/main/SPEC.md#full-grammar).
+Rules that are not defined in this grammar are prefixed with `$`, see [the KDL
+grammar](https://kdl.dev/spec/#name-full-grammar) for
+what they expand to.
 
 ```
-query := selector q-ws* "||" q-ws* query | selector
-selector := filter q-ws* selector-operator q-ws* selector | filter
+query-str := $bom? query
+query := selector q-ws+ "||" q-ws+ query | selector
+selector := filter q-ws+ selector-operator q-ws+ selector-subsequent | filter
+selector-subsequent := matchers q-ws+ selector-operator q-ws+ selector-subsequent | matchers
 selector-operator := ">>" | ">" | "++" | "+"
-filter := matcher+
-matcher := "top()"| "()" | identifier | type | accessor-matcher
-accessor-matcher := "[" (comparison | accessor)? "]"
-comparison := accessor q-ws* matcher-operator q-ws* (type | identifier | string | number | keyword)
-accessor := "val(" number ")" | "prop(" identifier ")" | "name()" | "tag()" | "values()" | "props()" | identifier
+filter := "top(" q-ws* ")" | matchers
+matchers := type-matcher $string? accessor-matcher* | $string accessor-matcher* | accessor-matcher+
+type-matcher := "(" q-ws* ")" | $type
+accessor-matcher := "[" q-ws* (comparison | accessor)? q-ws* "]"
+comparison := accessor q-ws+ matcher-operator q-ws+ ($type | $string | $number | $keyword)
+accessor := "val(" q-ws* $integer q-ws* ")" | "prop(" q-ws* $string q-ws* ")" | "name(" q-ws* ")" | "tag(" q-ws* ")" | "values(" q-ws* ")" | "props(" q-ws* ")" | $string
 matcher-operator := "=" | "!=" | ">" | "<" | ">=" | "<=" | "^=" | "$=" | "*="
 
-q-ws := bom | unicode-space
+q-ws := $node-space
 ```

README.md

@@ -2,8 +2,8 @@
 
 KDL is a small, pleasant document language with XML-like node semantics that
 looks like you're invoking a bunch of CLI commands! It's meant to be used both
-as a serialization format and a configuration language, much like JSON, YAML,
-or XML. It looks like this:
+as a serialization format and a configuration language, much like JSON, YAML, or
+XML. It looks like this:
 
 ```kdl
 package {
@@ -18,11 +18,15 @@ package {
 
   scripts {
     // "Raw" and dedented multi-line strings are supported.
-    build #"
+    message """
+      hello
+      world
+      """
+    build #"""
       echo "foo"
       node -c "console.log('hello, world!');"
       echo "foo" > some-file.txt
-      "#
+      """#
   }
 
   // `\` breaks up a single node across multiple lines.
@@ -40,46 +44,97 @@ package {
 }
 ```
 
-There's a living [specification](SPEC.md), as well as various
+For more details, see the [overview below](#overview).
+
+There's a living [specification](https://kdl.dev/spec/), as well as various
 [implementations](#implementations). You can also check out the [FAQ](#faq) to
 answer all your burning questions!
 
-In addition to a spec for KDL itself, there are also standard specs for [a KDL
-Query Language](QUERY-SPEC.md) based on CSS selectors, and [a KDL Schema
+The current version of the KDL spec is
+[KDL 2.0.0](https://kdl-org.github.io/kdl/#go.draft-marchan-kdl2.html). For legacy KDL,
+please refer to the [KDL 1.0.0
+spec](https://github.com/kdl-org/kdl/blob/2.0.0/SPEC_v1.md). All users are
+encouraged to migrate. [Migration is forward-and-backward-compatible and
+safe](https://kdl-org.github.io/kdl/#go.draft-marchan-kdl2.html#compatibility), and can
+be automated.
+
+In addition to a spec for KDL itself, there are specifications for [a KDL Query
+Language](QUERY-SPEC.md) based on CSS selectors, and [a KDL Schema
 Language](SCHEMA-SPEC.md) loosely based on JSON Schema.
 
-The language is based on [SDLang](https://sdlang.org), with a number of
-modifications and clarifications on its syntax and behavior.
+The language is based on [SDLang](https://sdlang.org), with a [number of
+modifications and clarifications on its syntax and behavior](#why-not-sdlang).
+We are grateful for their work as an inspiration to ours.
 
-The current version of the KDL spec is `2.0.0-draft.2`.
-
-[Play with it in your browser!](https://kdl-play.danini.dev/)
+[Play with it in your browser!](https://kdl.dev/play/)
 
 ## Design and Discussion
 
-KDL is still extremely new, and discussion about the format should happen over
-on the [discussions page](https://github.com/kdl-org/kdl/discussions). Feel
-free to jump in and give us your 2 cents!
+KDL 2.0.0 has been finalized, and no further changes are expected. For questions
+about KDL and discussions, please see the [discussions
+page](https://github.com/kdl-org/kdl/discussions). For minor editorial fixes or
+critical spec errata, please feel free to [file an
+issue](https://github.com/kdl-org/kdl/issues).
+
+## Used By
+
+A lot of folks have started picking up KDL for both personal projects, and
+larger open source, and even proprietary projects! This section includes a list
+of some examples of KDL in the wild (either v1, v2, or both):
+
+* [Zellij](https://zellij.dev) - Terminal workspace/multiplexer
+* [Niri](https://github.com/YaLTeR/niri) - Scrollable-tiling window manager for Wayland
+* [Bikeshed](https://github.com/speced/bikeshed) ([here](https://github.com/speced/bikeshed-boilerplate/blob/main/boilerplate/doctypes.kdl) and [here](https://github.com/speced/bikeshed-data/blob/main/data/manifest.txt)) - Specification pre-processor used by CSS, C++, WHATWG, various W3C working groups, and others.
+* [orogene](https://orogene.dev) - Lightning-fast JavaScript package manager
+* [Onyx](https://onyxlang.io/) - An efficient, procedural, and pragmatic programming language that compiles to WASM. Used for package manifests.
+* [Pop!_OS/System76 Scheduler](https://github.com/pop-os/system76-scheduler) - Scheduling service which optimizes Linux's CPU scheduler and makes it go faster.
+* [ImStyle](https://patitotective.github.io/ImStyle/) - ImGui application styling with Nim and KDL
+* [fmod-rs](https://github.com/CAD97/fmod-rs) - Rust bindings to FMOD Core and FMOD Studio
+* [mise](https://mise.jdx.dev/) - dev tools, env vars, task runner
+* [Camping](https://github.com/camping/camping) - Ruby web microframework
+* [Iron Vault](https://ironvault.quest) - VTT (Virtual Tabletop) plugin for Obsidian for the Ironsworn family of games
+* [Microsoft TypeScript DOM Generator](https://github.com/microsoft/TypeScript-DOM-lib-generator) - Tool for generating DOM-related TypeScript and JavaScript library files
+* [Ferron](https://ferron.sh/) - A fast, memory-safe web server written in Rust
+* You?
 
 ## Implementations
 
-* Rust: [kdl-rs](https://github.com/kdl-org/kdl-rs), [knuffel](https://crates.io/crates/knuffel/) (latter includes derive macro), and [kaydle](https://github.com/Lucretiel/kaydle) (serde-based)
-* JavaScript: [kdljs](https://github.com/kdl-org/kdljs), [@virtualstate/kdl](https://github.com/virtualstate/kdl) (query only, JSX based)
-* Ruby: [kdl-rb](https://github.com/danini-the-panini/kdl-rb)
-* Dart: [kdl-dart](https://github.com/danini-the-panini/kdl-dart)
-* Java: [kdl4j](https://github.com/hkolbeck/kdl4j)
-* PHP: [kdl-php](https://github.com/kdl-org/kdl-php)
-* Python: [kdl-py](https://github.com/tabatkins/kdlpy), [cuddle](https://github.com/djmattyg007/python-cuddle), [ckdl](https://github.com/tjol/ckdl)
-* Elixir: [kuddle](https://github.com/IceDragon200/kuddle)
-* XSLT: [xml2kdl](https://github.com/Devasta/XML2KDL)
-* Haskell: [Hustle](https://github.com/fuzzypixelz/Hustle)
-* .NET: [Kadlet](https://github.com/oledfish/Kadlet)
-* C: [ckdl](https://github.com/tjol/ckdl)
-* C++: [kdlpp](https://github.com/tjol/ckdl) (part of ckdl, requires C++20)
-* OCaml: [ocaml-kdl](https://github.com/Bannerets/ocaml-kdl)
-* Nim: [kdl-nim](https://github.com/Patitotective/kdl-nim)
-* Common Lisp: [kdlcl](https://github.com/chee/kdlcl)
-* Go: [gokdl](https://github.com/lunjon/gokdl), [kdl-go](https://github.com/sblinch/kdl-go)
+> [!INFO] There are two major versions of KDL. Different libraries may support one or the
+> other, or even provide a "hybrid" mode where both versions are attempted, since
+> there's no data ambiguity between v1 and v2 documents.
+
+| Language | Implementation | v1 | v2 | Notes |
+|---|---|---|---|---|
+| C | [ckdl](https://github.com/tjol/ckdl) | ✅ | ✅ | |
+| C#/.NET | [Kadlet](https://github.com/oledfish/Kadlet) | ✅ | ✖️ | |
+| C#/.NET | [KadSharp](https://github.com/AndreyAkinshin/KdlSharp) | ✅ | ✅ | .NET Std: 2.1+, .NET 6+, .NET FW 4.7.2+, Mono, Xamarin |
+| C++ | [kdlpp](https://github.com/tjol/ckdl) | ✅ | ✅ | part of ckdl, requires C++20 |
+| Common Lisp | [kdlcl](https://github.com/chee/kdlcl) | ✅ | ✖️ | |
+| Crystal | [kdl-cr](https://github.com/danini-the-panini/kdl-cr) | ✅ | ✖️ | |
+| Dart | [kdl-dart](https://github.com/danini-the-panini/kdl-dart) | ✅ | ✅ | |
+| Elixir | [kuddle](https://github.com/IceDragon200/kuddle) | ✅ | ✅ | |
+| Go | [gokdl](https://github.com/lunjon/gokdl) | ✅ | ✖️ | |
+| Go | [kdl-go](https://github.com/sblinch/kdl-go) | ✅ | ✖️ | |
+| Go | [gokdl2](https://github.com/njreid/gokdl2) | ✅ | ✅ | Friendly errors & arena allocator |
+| Haskell | [Hustle](https://github.com/fuzzypixelz/Hustle) | ✅ | ✖️ | |
+| Haskell | [kdl-hs](https://github.com/brandonchinn178/kdl-hs) | ✅ | ✅ | Format/comment-preserving parser |
+| Java | [kdl4j](https://github.com/kdl-org/kdl4j) | ✅ | ✅ | |
+| JavaScript | [@bgotink/kdl](https://github.com/bgotink/kdl) | ✅ | ✅ | Format/comment-preserving parser |
+| JavaScript | [@virtualstate/kdl](https://github.com/virtualstate/kdl) | ✅ | ✖️ | query only, JSX based |
+| JavaScript | [kdljs](https://github.com/kdl-org/kdljs) | ✅ | ✅ | |
+| Lua | [kdlua](https://github.com/danini-the-panini/kdlua) | ✅ | ✖️ | |
+| Nim | [kdl-nim](https://github.com/Patitotective/kdl-nim) | ✅ | ✖️ | |
+| OCaml | [ocaml-kdl](https://github.com/eilvelia/ocaml-kdl) | ✅ | ✅ | |
+| PHP | [kdl-php](https://github.com/kdl-org/kdl-php) | ✅ | ✖️ | |
+| Python | [ckdl](https://github.com/tjol/ckdl) | ✅ | ✅ | |
+| Python | [cuddle](https://github.com/djmattyg007/python-cuddle) | ✅ | ✖️ | |
+| Python | [kdl-py](https://github.com/tabatkins/kdlpy) | ✅ | ✅ | |
+| Ruby | [kdl-rb](https://github.com/danini-the-panini/kdl-rb) | ✅ | ✅ | |
+| Rust | [kdl-rs](https://github.com/kdl-org/kdl-rs) | ✅ | ✅ | Format/comment-preserving parser |
+| Rust | [knus](https://crates.io/crates/knus/) | ✅ | ✖️ | Serde-_style_ derive macros (not actual Serde) |
+| Swift | [kdl-swift](https://github.com/danini-the-panini/kdl-swift) | ✅ | ✖️ | |
+| XSLT | [xml2kdl](https://github.com/Devasta/XML2KDL) | ✅ | ✖️ | |
+| Zig | [zig-kdl](https://codeberg.org/desttinghim/zig-kdl) | ✅ | ✅ | Format/comment-preserving parser |
 
 ## Compatibility Test Suite
 
@@ -91,10 +146,15 @@ entirety, but in the future, may be required to in order to be included here.
 
 ## Editor Support
 
-* [VS Code](https://marketplace.visualstudio.com/items?itemName=kdl-org.kdl&ssr=false#review-details)
-* [Sublime Text](https://packagecontrol.io/packages/KDL)
-* [vim](https://github.com/imsnif/kdl.vim)
 * [Intellij IDEA](https://plugins.jetbrains.com/plugin/20136-kdl-document-language)
+* [Sublime Text](https://packagecontrol.io/packages/KDL)\*
+* [TreeSitter](https://github.com/tree-sitter-grammars/tree-sitter-kdl) (neovim, among others)
+* [VS Code](https://marketplace.visualstudio.com/items?itemName=kdl-org.kdl&ssr=false#review-details)\*
+* [vim](https://github.com/imsnif/kdl.vim)
+* [Kate](https://github.com/larsgw/katepart-kdl)\*
+* [Zed](https://zed.dev/extensions/kdl)
+
+\* Supports KDL 2.0.0
 
 ## Overview
 
@@ -134,7 +194,7 @@ Nodes without children are terminated by a newline, a semicolon, or the end of
 a file stream:
 
 ```kdl
-node1; node2; node3;
+node1; node2; node3
 ```
 
 ### Values
@@ -142,13 +202,13 @@ node1; node2; node3;
 KDL supports 4 data types:
 
 * Strings: `unquoted`, `"hello world"`, or `#"hello world"#`
-* Numbers: `123.45`
+* Numbers: `123.45`, `0xdeadbeef`, `#inf`, `#-inf`, `#nan`
 * Booleans: `#true` and `#false`
 * Null: `#null`
 
 #### Strings
 
-It supports three different formats for string input: identifiers, quoted, and raw.
+It supports three different formats for string input: unquoted, quoted, and raw.
 
 ```kdl
 node1 this-is-a-string
@@ -156,38 +216,38 @@ node2 "this\nhas\tescapes"
 node3 #"C:\Users\zkat\raw\string"#
 ```
 
-You don't have to quote strings unless they contain whitespace, or if any the
-following apply:
-  * The string contains any of `[]{}()\/#";`.
+You don't have to quote strings unless any the following apply:
   * The string contains whitespace.
-  * The string is one of `true`, `false`, or `null`.
-  * The strings starts with a digit, or `+`/`-` and a digit.
-  * The string contains an equals sign (including unicode equals signs `﹦`,
-    `＝`, and `🟰`).
+  * The string contains any of `[]{}()\/#";=`.
+  * The string is one of `true`, `false`, `null`, `inf`, `-inf`, or `nan`.
+  * The strings starts with a digit, or `+`/`-`/`.`/`-.`,`+.` and a digit.
+    (aka "looks like a number")
 
-In essence, if it can get confused for other KDL syntax, it needs quotes.
+In essence, if it can get confused for other KDL or KQL syntax, it needs
+quotes.
 
-Both types of quoted string can be multiline as-is, without a different
-syntax. Additionally, these multi-line strings will be "dedented" according to
-the common indentation that all lines share:
+Both types of quoted string can be written across multiple lines by using triple
+quotes (`"""`) followed immediately by a newline. Additionally, common
+indentation shared with the line containing the closing quotes will be
+stripped/dedented:
 
 ```kdl
-string "
+string """
   my
     multiline
   value
-"
+  """
 ```
 
 Raw strings, which do not support `\` escapes and can be used when you want
 certain kinds of strings to look nicer without having to escape a lot:
 
 ```kdl
-exec #"
+exec #"""
   echo "foo"
   echo "bar"
   cd C:\path\to\dir
-"#
+  """#
 
 regex #"\d{3} "[^/"]+""#
 ```
@@ -196,15 +256,15 @@ You can add any number of `#`s before and after the opening and
 closing `#` to disambiguate literal closing `#"` sequences:
 
 ```kdl
-other-raw ##"hello"#world"##
+other-raw ##"hello#"world"##
 ```
 
 #### Numbers
 
-There are 4 ways to represent numbers in KDL. KDL does not prescribe any
-representation for these numbers, and it's entirely up to individual
-implementations whether to represent all numbers with a single type, or to
-have different representations for different forms.
+There are 4 ways to represent numbers in KDL, plus 3 float keywords. KDL does
+not prescribe any representation for these numbers, and it's entirely up to
+individual implementations whether to represent all numbers with a single type,
+or to have different representations for different forms.
 
 KDL has regular decimal-radix numbers, with optional decimal part, as well as
 an optional exponent.
@@ -222,6 +282,13 @@ my-octal 0o755
 my-binary 0b10101101
 ```
 
+If you're intending to represent IEEE 754 floats, there are three special
+keywords you can use:
+
+```kdl
+special-floats #inf #-inf #nan
+```
+
 Finally, all numbers can have underscores to help readability:
 
 ```kdl
@@ -248,7 +315,7 @@ hello
 ```
 
 On top of that, KDL supports `/-` "slashdash" comments, which can be used to
-comment out individual nodes, arguments, or children:
+comment out individual nodes, entries, or child blocks:
 
 ```kdl
 // This entire node and its children are all commented out.
@@ -262,6 +329,8 @@ mynode /-commented "not commented" /-key=value /-{
   a
   b
 }
+// The above is equivalent to:
+mynode "not commented"
 ```
 
 ### Type Annotations
@@ -291,13 +360,13 @@ smile 😁
 
 // Node names and property keys are just strings, so you can write them like
 // quoted or raw strings, too!
-"illegal{}[]/\\=#;identifier" #"1.2.3"# "#false"=#true
+"illegal(){}[]/\\=#;identifier" #"1.2.3"# "#false"=#true
 
 // Identifiers are very flexible. The following is a legal bare identifier:
-<@foo123~!$%^&*.:'|?+>
+-<123~!$@%^&*,.:'`|?+>
 
-// And you can also use unicode, even for the equals sign!
-ノード　お名前＝☜(ﾟヮﾟ☜)
+// And you can also use non-ASCII unicode!
+ノード　お名前=ฅ^•ﻌ•^ฅ
 
 // kdl specifically allows properties and values to be
 // interspersed with each other, much like CLI commands.
@@ -306,9 +375,9 @@ foo bar=#true baz quux=#false 1 2 3
 
 ## Design Principles
 
-1. Maintainability
+1. Human Maintainability
 1. Flexibility
-1. Cognitive simplicity and Learnability
+1. Cognitive Simplicity and Learnability
 1. Ease of de/serialization
 1. Ease of implementation
 
@@ -333,28 +402,43 @@ Same as "cuddle".
 Because nothing out there felt quite right. The closest one I found was
 SDLang, but that had some design choices I disagreed with.
 
+<a name="why-not-sdlang"></a>
 #### Ok, then, why not SDLang?
 
-SDLang is designed for use cases that are not interesting to me, but are very
-relevant to the D-lang community. KDL is very similar in many ways, but is
-different in the following ways:
+SDLang is an excellent base, but I wanted some details ironed out, and some
+things removed that only really made sense for SDLang's current use-cases, including
+some restrictions about data representation. KDL is very similar in many ways, except:
 
-* The grammar and expected semantics are [well-defined and specified](SPEC.md).
-* There is only one "number" type. KDL does not prescribe representations.
+* The grammar and expected semantics are [well-defined and specified](https://kdl-org.github.io/kdl/#go.draft-marchan-kdl2.html).
+  This was the original impetus for working on KDL, followed by details that
+  seemed like they could be improved.
+* There is only one "number" type. KDL does not prescribe representations, but
+  does have keywords for NaN, infinity, and negative infinity if decimal numbers
+  are intended to be represented as IEEE754 floats.
 * Slashdash (`/-`) comments are great and useful!
-* I am not interested in having first-class date types, and SDLang's are very
-  non-standard.
+* Quoteless "identifier" strings (e.g. `node foo=bar`, vs `node foo="bar"`).
+* KDL does not have first-class date or binary data types. Instead, it
+  supports arbitrary type annotations for any custom data type you might need:
+  `(date)"2021-02-03"`, `(binary)"deadbeefbadc0ffee"`.
 * Values and properties can be interspersed with each other, rather than one
-  having to follow the other.
-* KDL does not have a first-class binary data type. Just use strings with base64.
-* All strings in KDL are multi-line, and raw strings are written with
-  Rust-style syntax (`r"foo"`), instead of backticks.
-* KDL identifiers can use UTF-8 and are much more lax about symbols than SDLang.
-* KDL does not support "anonymous" nodes.
-* Instead, KDL supports arbitrary identifiers for node names and attribute
+  having to follow the other. It was not clear whether this was actually allowed in SDLang.
+* Multi-line strings are supported using `"""<newline>` and their lines are automatically
+  "dedented" to match their closing quotes' indentation level.
+* Raw strings are written with `#` (`#"foo\bar"#`), instead of backticks. This,
+  while more verbose, allows embedding of languages, especially scripting
+  languages, that use this syntax on a regular basis, without additional escaping
+  (e.g. bash and JavaScript).
+* KDL identifiers can use a wide range of UTF-8 and are much more lax about
+  valid characters than SDLang.
+* KDL does not support "anonymous" nodes. Instead, any string can be used as a
+  node name. For lists of arbitrary values, there is a convention of naming the nodes
+  simply `-`.
+* Namespaces are not supported, but `:` is a legal identifier character, and applications
+  can choose to implement namespaces as they see fit.
+* KDL supports arbitrary identifiers for node names and attribute
   names, meaning you can use arbitrary strings for those: `"123" "value"=1` is
   a valid node, for example. This makes it easier to use KDL for
-  representing arbitrary key/value pairs.
+  representing arbitrary key/value pairs using child nodes.
 
 #### Have you seen that one XKCD comic about standards?
 
@@ -392,7 +476,10 @@ microsyntax for losslessly encoding JSON](JSON-IN-KDL.md).
 
 #### What about TOML?
 
-It nests very poorly. It doesn't fare well with large files.
+It nests very poorly. It doesn't fare well with large files. Also, I felt some
+discomfort [continuing to use and promote something by its
+creator](https://en.wikipedia.org/wiki/Tom_Preston-Werner#Resignation_from_GitHub).
+
 
 #### What about XML?
 

SCHEMA-SPEC.md

@@ -268,7 +268,7 @@ and property names when the `node-names` or `prop-names` options are activated.
 
 * `tag`: [Validations](#validation-nodes) to apply to the tag of the value.
 * `type`: A string denoting the type of the property value.
-* `enum`: A specific list of allowed values for this property. May be heterogenous as long as it agrees with the `type`, if specified.
+* `enum`: A specific list of allowed values for this property. May be heterogeneous as long as it agrees with the `type`, if specified.
 
 #### String validations
 
@@ -287,7 +287,7 @@ and property names when the `node-names` or `prop-names` options are activated.
     * `country-subdivision`: ISO 3166-2 country subdivision code.
     * `email`: RFC5302 email address.
     * `idn-email`: RFC6531 internationalized email address.
-    * `hostname`: RFC1132 internet hostname.
+    * `hostname`: RFC1123 internet hostname.
     * `idn-hostname`: RFC5890 internationalized internet hostname.
     * `ipv4`: RFC2673 dotted-quad IPv4 address.
     * `ipv6`: RFC2373 IPv6 address.
@@ -313,10 +313,12 @@ and property names when the `node-names` or `prop-names` options are activated.
     * `i16`: 16-bit signed integer
     * `i32`: 32-bit signed integer
     * `i64`: 64-bit signed integer
+    * `i128`: 128-bit signed integer
     * `u8`: 8-bit unsigned integer
     * `u16`: 16-bit unsigned integer
     * `u32`: 32-bit unsigned integer
     * `u64`: 64-bit unsigned integer
+    * `u128`: 128-bit unsigned integer
     * `isize`: Platform-dependent signed integer
     * `usize`: Platform-dependent unsigned integer
     * `f32`: IEEE 754 single (32-bit) precision floating point number

SPEC.md

@@ -1,770 +1 @@
-# KDL Spec
-
-This is the semi-formal specification for KDL, including the intended data
-model and the grammar.
-
-This document describes KDL version `2.0.0-draft.2`. It was released on
-2024-02-06.
-
-## Introduction
-
-KDL is a node-oriented document language. Its niche and purpose overlaps with
-XML, and as do many of its semantics. You can use KDL both as a configuration
-language, and a data exchange or storage format, if you so choose.
-
-The bulk of this document is dedicated to a long-form description of all
-[Components](#components) of a KDL document. There is also a much more terse
-[Grammar](#full-grammar) at the end of the document that covers most of the
-rules, with some semantic exceptions involving the data model.
-
-KDL is designed to be easy to read _and_ easy to implement.
-
-In this document, references to "left" or "right" refer to directions in the
-*data stream* towards the beginning or end, respectively; in other words,
-the directions if the data stream were only ASCII text. They do not refer
-to the writing direction of text, which can flow in either direction,
-depending on the characters used.
-
-## Components
-
-### Document
-
-The toplevel concept of KDL is a Document. A Document is composed of zero or
-more [Nodes](#node), separated by newlines and whitespace, and eventually
-terminated by an EOF.
-
-All KDL documents should be UTF-8 encoded and conform to the specifications in
-this document.
-
-#### Example
-
-The following is a document composed of two toplevel nodes:
-
-```kdl
-foo {
-    bar
-}
-baz
-```
-
-### Node
-
-Being a node-oriented language means that the real core component of any KDL
-document is the "node". Every node must have a name, which must be a
-[String](#string).
-
-The name may be preceded by a [Type Annotation](#type-annotation) to further
-clarify its type, particularly in relation to its parent node. (For example,
-clarifying that a particular `date` child node is for the _publication_ date,
-rather than the last-modified date, with `(published)date`.)
-
-Following the name are zero or more [Arguments](#argument) or
-[Properties](#property), separated by either [whitespace](#whitespace) or [a
-slash-escaped line continuation](#line-continuation). Arguments and Properties
-may be interspersed in any order, much like is common with positional
-arguments vs options in command line tools.
-
-[Children](#children-block) can be placed after the name and the optional
-Arguments and Properties, possibly separated by either whitespace or a
-slash-escaped line continuation.
-
-Arguments are ordered relative to each other (but not relative to Properties)
-and that order must be preserved in order to maintain the semantics.
-
-By contrast, Property order _SHOULD NOT_ matter to implementations.
-[Children](#children-block) should be used if an order-sensitive key/value
-data structure must be represented in KDL.
-
-Nodes _MAY_ be prefixed with [Slashdash](#slashdash-comments) to "comment out"
-the entire node, including its properties, arguments, and children, and make
-it act as plain whitespace, even if it spreads across multiple lines.
-
-Finally, a node is terminated by either a [Newline](#newline), a semicolon (`;`)
-or the end of the file/stream (an `EOF`).
-
-#### Example
-
-```kdl
-foo 1 key=val 3 {
-    bar
-    (role)baz 1 2
-}
-```
-
-### Line Continuation
-
-Line continuations allow [Nodes](#node) to be spread across multiple lines.
-
-A line continuation is a `\` character followed by zero or more whitespace
-items (including multiline comments) and an optional single-line comment. It
-must be terminated by a [Newline](#newline) (including the Newline that is
-part of single-line comments).
-
-Following a line continuation, processing of a Node can continue as usual.
-
-#### Example
-
-```kdl
-my-node 1 2 \  // comments are ok after \
-        3 4    // This is the actual end of the Node.
-```
-
-### Property
-
-A Property is a key/value pair attached to a [Node](#node). A Property is
-composed of a [String](#string), followed immediately by an [equals
-sign](#equals-sign), and then a [Value](#value).
-
-Properties should be interpreted left-to-right, with rightmost properties with
-identical names overriding earlier properties. That is:
-
-```kdl
-node a=1 a=2
-```
-
-In this example, the node's `a` value must be `2`, not `1`.
-
-No other guarantees about order should be expected by implementers.
-Deserialized representations may iterate over properties in any order and
-still be spec-compliant.
-
-Properties _MAY_ be prefixed with `/-` to "comment out" the entire token and
-make it act as plain whitespace, even if it spreads across multiple lines.
-
-#### Equals Sign
-
-Any of the following characters may be used as equals signs in properties:
-
-| Name | Character | Code Point |
-|----|-----|----|
-| EQUALS SIGN | `=` | `U+003D` |
-| SMALL EQUALS SIGN | `﹦` | `U+FE66` |
-| FULLWIDTH EQUALS SIGN | `＝` | `U+FF1D` |
-| HEAVY EQUALS SIGN | `🟰` | `U+1F7F0` |
-
-### Argument
-
-An Argument is a bare [Value](#value) attached to a [Node](#node), with no
-associated key. It shares the same space as [Properties](#properties), and may be interleaved with them.
-
-A Node may have any number of Arguments, which should be evaluated left to
-right. KDL implementations _MUST_ preserve the order of Arguments relative to
-each other (not counting Properties).
-
-Arguments _MAY_ be prefixed with `/-` to "comment out" the entire token and
-make it act as plain whitespace, even if it spreads across multiple lines.
-
-#### Example
-
-```kdl
-my-node 1 2 3 a b c
-```
-
-### Children Block
-
-A children block is a block of [Nodes](#node), surrounded by `{` and `}`. They
-are an optional part of nodes, and create a hierarchy of KDL nodes.
-
-Regular node termination rules apply, which means multiple nodes can be
-included in a single-line children block, as long as they're all terminated by
-`;`.
-
-#### Example
-
-```kdl
-parent {
-    child1
-    child2
-}
-
-parent { child1; child2; }
-```
-
-### Value
-
-A value is either: a [String](#string), a [Number](#number), a
-[Boolean](#boolean), or [Null](#null).
-
-Values _MUST_ be either [Arguments](#argument) or values of
-[Properties](#property). Only [String](#string) values may be used as
-[Node](#node) names or [Property](#property) keys.
-
-Values (both as arguments and as properties) _MAY_ be prefixed by a single
-[Type Annotation](#type-annotation).
-
-### Type Annotation
-
-A type annotation is a prefix to any [Node Name](#node) or [Value](#value) that
-includes a _suggestion_ of what type the value is _intended_ to be treated as,
-or as a _context-specific elaboration_ of the more generic type the node name
-indicates.
-
-Type annotations are written as a set of `(` and `)` with a single
-[String](#string) in it. It may contain Whitespace after the `(` and before
-the `)`, and may be separated from its target by Whitespace.
-
-KDL does not specify any restrictions on what implementations might do with
-these annotations. They are free to ignore them, or use them to make decisions
-about how to interpret a value.
-
-Additionally, the following type annotations MAY be recognized by KDL parsers
-and, if used, SHOULD interpret these types as follows:
-
-#### Reserved Type Annotations for Numbers Without Decimals:
-
-Signed integers of various sizes (the number is the bit size):
-
-* `i8`
-* `i16`
-* `i32`
-* `i64`
-
-Unsigned integers of various sizes (the number is the bit size):
-
-* `u8`
-* `u16`
-* `u32`
-* `u64`
-
-Platform-dependent integer types, both signed and unsigned:
-
-* `isize`
-* `usize`
-
-#### Reserved Type Annotations for Numbers With Decimals:
-
-IEEE 754 floating point numbers, both single (32) and double (64) precision:
-
-* `f32`
-* `f64`
-
-IEEE 754-2008 decimal floating point numbers
-
-* `decimal64`
-* `decimal128`
-
-#### Reserved Type Annotations for Strings:
-
-* `date-time`: ISO8601 date/time format.
-* `time`: "Time" section of ISO8601.
-* `date`: "Date" section of ISO8601.
-* `duration`: ISO8601 duration format.
-* `decimal`: IEEE 754-2008 decimal string format.
-* `currency`: ISO 4217 currency code.
-* `country-2`: ISO 3166-1 alpha-2 country code.
-* `country-3`: ISO 3166-1 alpha-3 country code.
-* `country-subdivision`: ISO 3166-2 country subdivision code.
-* `email`: RFC5322 email address.
-* `idn-email`: RFC6531 internationalized email address.
-* `hostname`: RFC1132 internet hostname (only ASCII segments)
-* `idn-hostname`: RFC5890 internationalized internet hostname (only `xn--`-prefixed ASCII "punycode" segments, or non-ASCII segments)
-* `ipv4`: RFC2673 dotted-quad IPv4 address.
-* `ipv6`: RFC2373 IPv6 address.
-* `url`: RFC3986 URI.
-* `url-reference`: RFC3986 URI Reference.
-* `irl`: RFC3987 Internationalized Resource Identifier.
-* `irl-reference`: RFC3987 Internationalized Resource Identifier Reference.
-* `url-template`: RFC6570 URI Template.
-* `uuid`: RFC4122 UUID.
-* `regex`: Regular expression. Specific patterns may be implementation-dependent.
-* `base64`: A Base64-encoded string, denoting arbitrary binary data.
-
-#### Examples
-
-```kdl
-node (u8)123
-node prop=(regex).*
-(published)date "1970-01-01"
-(contributor)person name="Foo McBar"
-```
-
-### String
-
-Strings in KDL represent textual UTF-8 [Values](#value). A String is either an
-[Identifier String](#identifier-string) (like `foo`), a [Quoted String](#quoted-string) (like `"foo"`) or
-a [Raw String](#raw-string) (like `#"foo"#`). Identifier Strings let you write short, "single-word" strings with a minimum of syntax; Quoted Strings let you write strings with whitespace (including newlines!) or escapes; Raw Strings let you write strings with whitespace *but without escapes*, allowing you to not worry about the string's content containing anything that might look like an escape.
-
-Strings _MUST_ be represented as UTF-8 values.
-
-Strings _MUST NOT_ include the code points for [disallowed literal code
-points](#disallowed-literal-code-points) directly. Quoted Strings may include
-these code points as _values_ by representing them with their corresponding
-`\u{...}` escape.
-
-### Identifier String
-
-An Identifier String (sometimes referred to as just an "identifier") is
-composed of any [Unicode Scalar
-Value](https://unicode.org/glossary/#unicode_scalar_value) other than
-[non-initial characters](#non-initial-characters), followed by any number of
-Unicode Scalar Values other than [non-identifier
-characters](#non-identifier-characters).
-
-A handful of patterns are disallowed, to avoid confusion with other values:
-
-* idents that appear to start with a [Number](#number)
-    (like `1.0v2` or `-1em`)
-    or the "almost a number" pattern of a decimal point without a leading digit
-    (like `.1`)
-* idents that are the language keywords (`true`, `false`, and `null`) without their leading `#`
-
-Identifiers that match these patterns _MUST_ be treated as a syntax error;
-such values can only be written as quoted or raw strings.
-The precise details of the identifier syntax is specified in the [Full Grammar](#full-grammar) below.
-
-Identifier Strings are terminated by [Whitespace](#whitespace) or
-[Newlines](#newline).
-
-#### Non-initial characters
-
-The following characters cannot be the first character in an
-[Identifier String](#identifier-string):
-
-* Any decimal digit (0-9)
-* Any [non-identifier characters](#non-identifier-characters)
-
-Additionally, the `-` character can only be used as an initial character if
-the second character is *not* a digit. This allows identifiers to look like
-`--this`, and removes the ambiguity of having an identifier look like a
-negative number.
-
-#### Non-identifier characters
-
-The following characters cannot be used anywhere in a [Identifier String](#identifier-string):
-
-* Any of `(){}[]/\"#;`
-* Any [Equals Sign](#equals-sign)
-* Any [Whitespace](#whitespace) or [Newline](#newline).
-* Any [disallowed literal code points](#disallowed-literal-code-points) in KDL
-  documents.
-
-### Quoted String
-
-A Quoted String is delimited by `"` on either side of any number of literal
-string characters except unescaped `"` and `\`. This includes literal
-[Newline](#newline) characters, which means a String Value can encompass
-multiple lines without behaving like a Newline for [Node](#node) parsing
-purposes.
-
-Like Identifier Strings, Quoted Strings _MUST NOT_ include any of the [disallowed literal
-code-points](#disallowed-literal-code-points) as code points in their body.
-
-Quoted Strings also follow the Multi-line rules specified in [Multi-line
-String](#multi-line-strings).
-
-#### Escapes
-
-In addition to literal code points, a number of "escapes" are supported in Quoted Strings.
-"Escapes" are the character `\` followed by another character, and are
-interpreted as described in the following table:
-
-| Name                          | Escape | Code Pt  |
-|-------------------------------|--------|----------|
-| Line Feed                     | `\n`   | `U+000A` |
-| Carriage Return               | `\r`   | `U+000D` |
-| Character Tabulation (Tab)    | `\t`   | `U+0009` |
-| Reverse Solidus (Backslash)   | `\\`   | `U+005C` |
-| Quotation Mark (Double Quote) | `\"`   | `U+0022` |
-| Backspace                     | `\b`   | `U+0008` |
-| Form Feed                     | `\f`   | `U+000C` |
-| Space                         | `\s`   | `U+0020` |
-| Unicode Escape                | `\u{(1-6 hex chars)}` | Code point described by hex characters, as long as it represents a [Unicode Scalar Value](https://unicode.org/glossary/#unicode_scalar_value) |
-| Whitespace Escape             | See below | N/A   |
-
-##### Escaped Whitespace
-
-In addition to escaping individual characters, `\` can also escape whitespace.
-When a `\` is followed by one or more literal whitespace characters, the `\`
-and all of that whitespace are discarded. For example, `"Hello World"` and
-`"Hello \    World"` are semantically identical. See [whitespace](#whitespace)
-and [newlines](#newlines) for how whitespace is defined.
-
-Note that only literal whitespace is escaped; whitespace escapes (`\n` and
-such) are retained. For example, these strings are all semantically identical:
-
-```kdl
-"Hello\       \nWorld"
-
-    "Hello\n\
-    World"
-
-"Hello\nWorld"
-
-"
-  Hello
-  World
-  "
-```
-
-##### Invalid escapes
-
-Except as described in the escapes table, above, `\` *MUST NOT* precede any
-other characters in a string.
-
-### Raw String
-
-Raw Strings in KDL are much like [Quoted Strings](#quoted-string), except they
-do not support `\`-escapes. They otherwise share the same properties as far as
-literal [Newline](#newline) characters go, multi-line rules, and the requirement
-of UTF-8 representation.
-
-Raw String literals are represented with one or more `#` characters, followed
-by `"`, followed by any number of UTF-8 literals. The string is then closed by
-a `"` followed by a _matching_ number of `#` characters. This means that the
-string sequence `"` or `"#` and such must not match the closing `"` with the
-same or more `#` characters as the opening `#`, in the body of the string.
-
-Like other Strings, Raw Strings _MUST NOT_ include any of the [disallowed
-literal code-points](#disallowed-literal-code-points) as code points in their
-body. Unlike with Quoted Strings, these cannot simply be escaped, and are thus
-unrepresentable when using Raw Strings.
-
-#### Example
-
-```kdl
-just-escapes #"\n will be literal"#
-```
-
-The string contains the literal characters `\n will be literal`.
-
-```kdl
-quotes-and-escapes ##"hello\n\r\asd"#world"##
-```
-
-The string contains the literal characters `hello\n\r\asd"#world`
-
-
-### Multi-line Strings
-
-When a Quoted or Raw String spans multiple lines with literal, non-escaped Newlines,
-it follows a special multi-line syntax
-that automatically "dedents" the string,
-allowing its value to be indented to a visually matching level if desired.
-
-A Multi-line string _MUST_ start with a [Newline](#newline)
-immediately following its opening `"`.
-Its final line, preceding the closing `"`,
-_MUST_ contain only whitespace.
-All in-between lines that contain non-whitespace characters
-_MUST_ start with the exact same whitespace as the final line
-(precisely matching codepoints, not merely counting characters).
-
-The value of the Multi-line String omits the first and last Newline,
-the Whitespace of the last line,
-the matching Whitespace prefix on all intermediate lines,
-and all Whitespace on intermediate Whitespace-only lines.
-The first and last Newline can be the same character
-(that is, empty multi-line strings are legal).
-
-Strings with literal Newlines that do not immediately start with a Newline and
-whose final `"` is not preceeded by optional whitespace and a Newline are illegal.
-
-In other words, the final line specifies the whitespace prefix that will be removed from all other lines.
-
-#### Example
-
-```kdl
-multi-line "
-        foo
-    This is the base indentation
-            bar
-    "
-```
-
-The last example's string value will be:
-
-```
-    foo
-This is the base indentation
-        bar
-```
-
-Equivalent to `"    foo\nThis is the base indentation\n        bar"`.
-
----------
-
-If the last line wasn't indented as far,
-it won't dedent the rest of the lines as much:
-
-```kdl
-multi-line "
-        foo
-    This is no longer on the left edge
-            bar
-  "
-```
-
-This example's string value will be:
-
-```
-      foo
-  This is no longer on the left edge
-          bar
-```
-
-Equivalent to `"      foo\n  This is no longer on the left edge\n          bar"`.
-
------------
-
-Empty lines can contain any whitespace, or none at all, and will be reflected as empty in the value:
-
-```kdl
-multi-line "
-    Indented a bit
-
-    A second indented paragraph.
-    "
-```
-
-This example's string value will be:
-
-```
-Indented a bit.
-
-A second indented paragraph.
-```
-
-Equivalent to `"Indented a bit.\n\nA second indented paragraph."`
-
-
-### Number
-
-Numbers in KDL represent numerical [Values](#value). There is no logical distinction in KDL
-between real numbers, integers, and floating point numbers. It's up to
-individual implementations to determine how to represent KDL numbers.
-
-There are four syntaxes for Numbers: Decimal, Hexadecimal, Octal, and Binary.
-
-* All numbers may optionally start with one of `-` or `+`, which determine whether they'll be positive or negative.
-* Binary numbers start with `0b` and only allow `0` and `1` as digits, which may be separated by `_`. They represent numbers in radix 2.
-* Octal numbers start with `0o` and only allow digits between `0` and `7`, which may be separated by `_`. They represent numbers in radix 8.
-* Hexadecimal numbers start with `0x` and allow digits between `0` and `9`, as well as letters `A` through `F`, in either lower or upper case, which may be separated by `_`. They represent numbers in radix 16.
-* Decimal numbers are a bit more special:
-    * They have no radix prefix.
-    * They use digits `0` through `9`, which may be separated by `_`.
-    * They may optionally include a decimal separator `.`, followed by more digits, which may again be separated by `_`.
-    * They may optionally be followed by `E` or `e`, an optional `-` or `+`, and more digits, to represent an exponent value.
-
-Note that, similar to JSON and some other languages,
-numbers without an integer digit (such as `.1`) are illegal.
-They must be written with at least one integer digit, like `0.1`.
-(These patterns are also disallowed from [Identifier Strings](#identifier-string), to avoid confusion.)
-
-### Boolean
-
-A boolean [Value](#value) is either the symbol `#true` or `#false`. These
-_SHOULD_ be represented by implementation as boolean logical values, or some
-approximation thereof.
-
-#### Example
-
-```kdl
-my-node true value=#false
-```
-
-### Null
-
-The symbol `#null` represents a null [Value](#value). It's up to the
-implementation to decide how to represent this, but it generally signals the
-"absence" of a value.
-
-#### Example
-
-```kdl
-my-node #null key=#null
-```
-
-### Whitespace
-
-The following characters should be treated as non-[Newline](#newline) [white
-space](https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt):
-
-| Name                 | Code Pt |
-|----------------------|---------|
-| Character Tabulation | `U+0009`  |
-| Line Tabulation      | `U+000B`  |
-| Space                | `U+0020`  |
-| No-Break Space       | `U+00A0`  |
-| Ogham Space Mark     | `U+1680`  |
-| En Quad              | `U+2000`  |
-| Em Quad              | `U+2001`  |
-| En Space             | `U+2002`  |
-| Em Space             | `U+2003`  |
-| Three-Per-Em Space   | `U+2004`  |
-| Four-Per-Em Space    | `U+2005`  |
-| Six-Per-Em Space     | `U+2006`  |
-| Figure Space         | `U+2007`  |
-| Punctuation Space    | `U+2008`  |
-| Thin Space           | `U+2009`  |
-| Hair Space           | `U+200A`  |
-| Narrow No-Break Space| `U+202F`  |
-| Medium Mathematical Space | `U+205F`  |
-| Ideographic Space    | `U+3000`  |
-
-#### Single-line comments
-
-Any text after `//`, until the next literal [Newline](#newline) is "commented
-out", and is considered to be [Whitespace](#whitespace).
-
-#### Multi-line comments
-
-In addition to single-line comments using `//`, comments can also be started
-with `/*` and ended with `*/`. These comments can span multiple lines. They
-are allowed in all positions where [Whitespace](#whitespace) is allowed and
-can be nested.
-
-#### Slashdash comments
-
-Finally, a special kind of comment called a "slashdash", denoted by `/-`, can
-be used to comment out entire _components_ of a KDL document logically, and
-have those elements be treated as whitespace.
-
-Slashdash comments can be used before:
-
-* A [Node](#node) name (or its type annotation): the entire Node is
-  treated as Whitespace, including all props, args, and children.
-* A node [Argument](#argument) (or its type annotation), in which case
-  the Argument value is treated as Whitespace.
-* A [Property](#property) key, in which case the entire property, both
-  key and value, is treated as Whitespace.
-* A [Children Block](#children-block), in which case the entire block,
-  including all children within, is treated as Whitespace.
-
-### Newline
-
-The following characters [should be treated as new
-lines](https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf):
-
-| Acronym | Name            | Code Pt |
-|---------|-----------------|---------|
-| CR      | Carriage Return | `U+000D`  |
-| LF      | Line Feed       | `U+000A`  |
-| CRLF    | Carriage Return and Line Feed | `U+000D` + `U+000A` |
-| NEL     | Next Line       | `U+0085`  |
-| FF      | Form Feed       | `U+000C`  |
-| LS      | Line Separator  | `U+2028`  |
-| PS      | Paragraph Separator | `U+2029` |
-
-Note that for the purpose of new lines, CRLF is considered _a single newline_.
-
-### Disallowed Literal Code Points
-
-The following code points may not appear literally anywhere in the document.
-They may be represented in Strings (but not Raw Strings) using `\u{}`.
-
-* The codepoints `U+0000-0009`,
-    the codepoint `U+000B`,
-    or the codepoints `U+000E-001F`  (various control characters).
-* `U+007F` (the Delete control character).
-* Any codepoint that is not a [Unicode Scalar
-  Value](https://unicode.org/glossary/#unicode_scalar_value).
-* `U+2066-2069`, `U+202A-202E`, `U+200E`, and `U+200F`, the [unicode
-  "direction control"
-  characters](https://www.w3.org/International/questions/qa-bidi-unicode-controls)
-
-## Full Grammar
-
-This is the full official grammar for KDL and should be considered
-authoritative if something seems to disagree with the text above. The [grammar
-language syntax](#grammar-language) is defined below.
-
-```
-document := bom? nodes
-
-nodes := (line-space* node)* line-space*
-
-plain-line-space := newline | ws | single-line-comment
-plain-node-space := ws* escline ws* | ws+
-
-line-space := plain-line-space+ ('/-' plain-node-space* node)?
-node-space := plain-node-space+ ('/-' plain-node-space* (node-prop-or-arg | node-children))?
-
-required-node-space := node-space* plain-node-space+
-optional-node-space := node-space*
-
-base-node := type? optional-node-space string (required-node-space node-prop-or-arg)* (required-node-space node-children)?
-node := base-node optional-node-space node-terminator
-final-node := base-node optional-node-space node-terminator?
-node-prop-or-arg := prop | value
-node-children := '{' nodes final-node? '}'
-node-terminator := single-line-comment | newline | ';' | eof
-
-prop := string optional-node-space equals-sign optional-node-space value
-value := type? optional-node-space (string | number | keyword)
-type := '(' optional-node-space string optional-node-space ')'
-equals-sign := See Table (Equals Sign)
-
-string := identifier-string | quoted-string | raw-string
-
-identifier-string := unambiguous-ident | signed-ident | dotted-ident
-unambiguous-ident := ((identifier-char - digit - sign - '.') identifier-char*) - 'true' - 'false' - 'null'
-signed-ident := sign ((identifier-char - digit - '.') identifier-char*)?
-dotted-ident := sign? '.' ((identifier-char - digit) identifier-char*)?
-identifier-char := unicode - line-space - [\\/(){};\[\]="#] - disallowed-literal-code-points
-
-quoted-string := '"' (single-line-string-body | newline multi-line-string-body newline ws*) '"'
-single-line-string-body := (string-character - newline)*
-multi-line-string-body := string-character*
-string-character := '\' escape | [^\\"] - disallowed-literal-code-points
-escape := ["\\bfnrt] | 'u{' hex-digit{1, 6} '}' | (unicode-space | newline)+
-hex-digit := [0-9a-fA-F]
-
-raw-string := '#' raw-string-quotes '#' | '#' raw-string '#'
-raw-string-quotes := '"' (single-line-raw-string-body | newline multi-line-raw-string-body newline ws*) '"'
-single-line-raw-string-body := (unicode - newline - disallowed-literal-code-points)*
-multi-line-raw-string-body := (unicode - disallowed-literal-code-points)*
-
-number := hex | octal | binary | decimal
-
-decimal := sign? integer ('.' integer)? exponent?
-exponent := ('e' | 'E') sign? integer
-integer := digit (digit | '_')*
-digit := [0-9]
-sign := '+' | '-'
-
-hex := sign? '0x' hex-digit (hex-digit | '_')*
-octal := sign? '0o' [0-7] [0-7_]*
-binary := sign? '0b' ('0' | '1') ('0' | '1' | '_')*
-
-keyword := boolean | '#null'
-
-boolean := '#true' | '#false'
-
-escline := '\\' ws* (single-line-comment | newline | eof)
-
-newline := See Table (All line-break white_space)
-
-ws := unicode-space | multi-line-comment
-
-bom := '\u{FEFF}'
-
-disallowed-literal-code-points := See Table (Disallowed Literal Code Points)
-
-unicode-space := See Table (All White_Space unicode characters which are not `newline`)
-
-single-line-comment := '//' ^newline* (newline | eof)
-multi-line-comment := '/*' commented-block
-commented-block := '*/' | (multi-line-comment | '*' | '/' | [^*/]+) commented-block
-```
-
-### Grammar language
-
-The grammar language syntax is a combination of ABNF with some regex spice thrown in.
-Specifically:
-
-* Single quotes (`'`) are used to denote literal text. `\` within a literal
-  string is used for escaping other single-quotes, for initiating unicode
-  characters using hex values (`\u{FEFF}`), and for escaping `\` itself
-  (`\\`).
-* `*` is used for "zero or more", `+` is used for "one or more", and `?` is
-  used for "zero or one".
-* `()` can be used to group matches that must be matched together.
-* `a | b` means `a or b`, whichever matches first. If multipe items are before
-  a `|`, they are a single group. `a b c | d` is equivalent to `(a b c) | d`.
-* `[]` are used for regex-style character matches, where any character between
-  the brackets will be a single match. `\` is used to escape `\`, `[`, and
-  `]`. They also support character ranges (`0-9`), and negation (`^`)
-* `-` is used for "except for" or "minus" whatever follows it. For example, `a
-  - `'x'` means "any `a`, except something that matches the literal `'x'`".
-* The prefix `^` means "something that does not match" whatever follows it.
-  For example, `^foo` means "must not match `foo`".
+The v2 specification has been moved [here](draft-marchan-kdl2.md).

SPEC_v1.md

@@ -0,0 +1,544 @@
+# KDL v1 Spec
+
+This is the semi-formal specification for the legacy version of KDL, including
+the intended data model and the grammar.
+
+This document describes KDL version `1.0.0`. It was released on September 11, 2021.
+
+Information in this spec is intended as both an accessible historical record,
+and a reference for KDL implementors who are interested in supporting both major
+versions of the language.
+
+The v1 spec will not receive further updates outside of minor, inconsequential
+rewordings or other superficial fixes and is considered a "legacy" version.
+
+## Compatibility
+
+KDL v2 is designed such that for any given KDL document in either v1 or v2, the
+parse will either fail completely, or, if the parse succeeds, the data
+represented by a v1 or v2 parser will be identical. This means that it's safe to
+use a fallback parsing strategy in order to support both v1 and v2
+simultaneously. For example, `node "foo"` is a valid node in both versions, and
+should be represented identically by parsers.
+
+KDL v2 is designed such that for any given KDL document written as KDL
+1.0 or [KDL 2.0](https://kdl-org.github.io/kdl/#go.draft-marchan-kdl2.html),
+the parse will either fail completely, or, if the
+parse succeeds, the data represented by a v1 or v2 parser will be identical.
+This means that it's safe to use a fallback parsing strategy in order to support
+both v1 and v2 simultaneously. For example, `node "foo"` is a valid node in both
+versions, and should be represented identically by parsers.
+
+A version marker `/- kdl-version 1` (or `2`) _MAY_ be added to the beginning of
+a KDL document, optionally preceded by the BOM, and parsers _MAY_ use that as a
+hint as to which version to parse the document as.
+
+## Introduction
+
+KDL is a node-oriented document language. Its niche and purpose overlaps with
+XML, and as do many of its semantics. You can use KDL both as a configuration
+language, and a data exchange or storage format, if you so choose.
+
+The bulk of this document is dedicated to a long-form description of all
+[Components](#components) of a KDL document. There is also a much more terse
+[Grammar](#full-grammar) at the end of the document that covers most of the
+rules, with some semantic exceptions involving the data model.
+
+KDL is designed to be easy to read _and_ easy to implement.
+
+In this document, references to "left" or "right" refer to directions in the
+*data stream* towards the beginning or end, respectively; in other words,
+the directions if the data stream were only ASCII text. They do not refer
+to the writing direction of text, which can flow in either direction,
+depending on the characters used.
+
+## Components
+
+### Document
+
+The toplevel concept of KDL is a Document. A Document is composed of zero or
+more [Nodes](#node), separated by newlines and whitespace, and eventually
+terminated by an EOF.
+
+All KDL documents should be UTF-8 encoded and conform to the specifications in
+this document.
+
+#### Example
+
+The following is a document composed of two toplevel nodes:
+
+```kdl
+foo {
+    bar
+}
+baz
+```
+
+### Node
+
+Being a node-oriented language means that the real core component of any KDL
+document is the "node". Every node must have a name, which is an
+[Identifier](#identifier).
+
+The name may be preceded by a [Type Annotation](#type-annotation) to further
+clarify its type, particularly in relation to its parent node. (For example,
+clarifying that a particular `date` child node is for the _publication_ date,
+rather than the last-modified date, with `(published)date`.)
+
+Following the name are zero or more [Arguments](#argument) or
+[Properties](#property), separated by either [whitespace](#whitespace) or [a
+slash-escaped line continuation](#line-continuation). Arguments and Properties
+may be interspersed in any order, much like is common with positional
+arguments vs options in command line tools.
+
+[Children](#children-block) can be placed after the name and the optional
+Arguments and Properties, possibly separated by either whitespace or a
+slash-escaped line continuation.
+
+Arguments are ordered relative to each other (but not relative to Properties)
+and that order must be preserved in order to maintain the semantics.
+
+By contrast, Property order _SHOULD NOT_ matter to implementations.
+[Children](#children-block) should be used if an order-sensitive key/value
+data structure must be represented in KDL.
+
+Nodes _MAY_ be prefixed with `/-` to "comment out" the entire node, including
+its properties, arguments, and children, and make it act as plain whitespace,
+even if it spreads across multiple lines.
+
+Finally, a node is terminated by either a [Newline](#newline), a semicolon (`;`)
+or the end of the file/stream (an `EOF`).
+
+#### Example
+
+```kdl
+foo 1 key="val" 3 {
+    bar
+    (role)baz 1 2
+}
+```
+
+### Identifier
+
+An Identifier is either a [Bare Identifier](#bare-identifier), which is an
+unquoted string like `node` or `item`, or a [String](#string), which is quoted,
+like `"node"` or `"two words"`. There's no semantic difference between the
+kinds of identifier; this simply allows for the use of quotes to have unusual
+identifiers that are inexpressible as bare identifiers.
+
+### Bare Identifier
+
+A Bare Identifier is composed of any Unicode codepoint other than [non-initial
+characters](#non-initial-characters), followed by any number of Unicode
+codepoints other than [non-identifier characters](#non-identifier-characters),
+so long as this doesn't produce something confusable for a [Number](#number),
+[Boolean](#boolean), or [Null](#null). For example, both a [Number](#number)
+and an Identifier can start with `-`, but when an Identifier starts with `-`
+the second character cannot be a digit. This is precisely specified in the
+[Full Grammar](#full-grammar) below.
+
+Identifiers are terminated by [Whitespace](#whitespace) or
+[Newlines](#newline).
+
+### Non-initial characters
+
+The following characters cannot be the first character in a
+[Bare Identifier](#identifier):
+
+* Any decimal digit (0-9)
+* Any [non-identifier characters](#non-identifier-characters)
+
+Be aware that the `-` character can only be used as an initial
+character if the second character is not a digit. This allows
+identifiers to look like `--this`, and removes the ambiguity
+of having an identifier look like a negative number.
+
+### Non-identifier characters
+
+The following characters cannot be used anywhere in a [Bare Identifier](#identifier):
+
+* Any codepoint with hexadecimal value `0x20` or below.
+* Any codepoint with hexadecimal value higher than `0x10FFFF`.
+* Any of `\/(){}<>;[]=,"`
+
+### Line Continuation
+
+Line continuations allow [Nodes](#node) to be spread across multiple lines.
+
+A line continuation is a `\` character followed by zero or more whitespace
+characters and an optional single-line comment. It must be terminated by a
+[Newline](#newline) (including the Newline that is part of single-line comments).
+
+Following a line continuation, processing of a Node can continue as usual.
+
+#### Example
+
+```kdl
+my-node 1 2 \  // comments are ok after \
+        3 4    // This is the actual end of the Node.
+```
+
+### Property
+
+A Property is a key/value pair attached to a [Node](#node). A Property is
+composed of an [Identifier](#identifier), followed immediately by a `=`, and then a [Value](#value).
+
+Properties should be interpreted left-to-right, with rightmost properties with
+identical names overriding earlier properties. That is:
+
+```kdl
+node a=1 a=2
+```
+
+In this example, the node's `a` value must be `2`, not `1`.
+
+No other guarantees about order should be expected by implementers.
+Deserialized representations may iterate over properties in any order and
+still be spec-compliant.
+
+Properties _MAY_ be prefixed with `/-` to "comment out" the entire token and
+make it act as plain whitespace, even if it spreads across multiple lines.
+
+### Argument
+
+An Argument is a bare [Value](#value) attached to a [Node](#node), with no
+associated key. It shares the same space as [Properties](#properties), and may be interleaved with them.
+
+A Node may have any number of Arguments, which should be evaluated left to
+right. KDL implementations _MUST_ preserve the order of Arguments relative to
+each other (not counting Properties).
+
+Arguments _MAY_ be prefixed with `/-` to "comment out" the entire token and
+make it act as plain whitespace, even if it spreads across multiple lines.
+
+#### Example
+
+```kdl
+my-node 1 2 3 "a" "b" "c"
+```
+
+### Children Block
+
+A children block is a block of [Nodes](#node), surrounded by `{` and `}`. They
+are an optional part of nodes, and create a hierarchy of KDL nodes.
+
+Regular node termination rules apply, which means multiple nodes can be
+included in a single-line children block, as long as they're all terminated by
+`;`.
+
+#### Example
+
+```kdl
+parent {
+    child1
+    child2
+}
+
+parent { child1; child2; }
+```
+
+### Value
+
+A value is either: a [String](#string), a [Number](#number), a
+[Boolean](#boolean), or [Null](#null).
+
+Values _MUST_ be either [Arguments](#argument) or values of
+[Properties](#property).
+
+Values (both as arguments and as properties) _MAY_ be prefixed by a single
+[Type Annotation](#type-annotation).
+
+### Type Annotation
+
+A type annotation is a prefix to any [Node Name](#node) or [Value](#value) that
+includes a _suggestion_ of what type the value is _intended_ to be treated as,
+or as a _context-specific elaboration_ of the more generic type the node name
+indicates.
+
+Type annotations are written as a set of `(` and `)` with an
+[Identifier](#identifier) in it. Any valid identifier is considered a valid
+type annotation. There must be no whitespace between a type annotation and its
+associated Node Name or Value.
+
+KDL does not specify any restrictions on what implementations might do with
+these annotations. They are free to ignore them, or use them to make decisions
+about how to interpret a value.
+
+Additionally, the following type annotations MAY be recognized by KDL parsers
+and, if used, SHOULD interpret these types as follows:
+
+#### Reserved Type Annotations for Numbers Without Decimals:
+
+Signed integers of various sizes (the number is the bit size):
+
+* `i8`
+* `i16`
+* `i32`
+* `i64`
+
+Unsigned integers of various sizes (the number is the bit size):
+
+* `u8`
+* `u16`
+* `u32`
+* `u64`
+
+Platform-dependent integer types, both signed and unsigned:
+
+* `isize`
+* `usize`
+
+#### Reserved Type Annotations for Numbers With Decimals:
+
+IEEE 754 floating point numbers, both single (32) and double (64) precision:
+
+* `f32`
+* `f64`
+
+IEEE 754-2008 decimal floating point numbers
+
+* `decimal64`
+* `decimal128`
+
+#### Reserved Type Annotations for Strings:
+
+* `date-time`: ISO8601 date/time format.
+* `time`: "Time" section of ISO8601.
+* `date`: "Date" section of ISO8601.
+* `duration`: ISO8601 duration format.
+* `decimal`: IEEE 754-2008 decimal string format.
+* `currency`: ISO 4217 currency code.
+* `country-2`: ISO 3166-1 alpha-2 country code.
+* `country-3`: ISO 3166-1 alpha-3 country code.
+* `country-subdivision`: ISO 3166-2 country subdivision code.
+* `email`: RFC5322 email address.
+* `idn-email`: RFC6531 internationalized email address.
+* `hostname`: RFC1123 internet hostname (only ASCII segments)
+* `idn-hostname`: RFC5890 internationalized internet hostname (only `xn--`-prefixed ASCII "punycode" segments, or non-ASCII segments)
+* `ipv4`: RFC2673 dotted-quad IPv4 address.
+* `ipv6`: RFC2373 IPv6 address.
+* `url`: RFC3986 URI.
+* `url-reference`: RFC3986 URI Reference.
+* `irl`: RFC3987 Internationalized Resource Identifier.
+* `irl-reference`: RFC3987 Internationalized Resource Identifier Reference.
+* `url-template`: RFC6570 URI Template.
+* `uuid`: RFC4122 UUID.
+* `regex`: Regular expression. Specific patterns may be implementation-dependent.
+* `base64`: A Base64-encoded string, denoting arbitrary binary data.
+
+#### Examples
+
+```kdl
+node (u8)123
+node prop=(regex)".*"
+(published)date "1970-01-01"
+(contributor)person name="Foo McBar"
+```
+
+### String
+
+Strings in KDL represent textual [Values](#value), or unusual identifiers. A
+String is either a [Quoted String](#quoted-string) or a
+[Raw String](#raw-string). Quoted Strings may include escaped characters, while
+Raw Strings always contain only the literal characters that are present.
+
+### Quoted String
+
+A Quoted String is delimited by `"` on either side of any number of literal
+string characters except unescaped `"` and `\`. This includes literal
+[Newline](#newline) characters, which means a String Value can encompass
+multiple lines without behaving like a Newline for [Node](#node) parsing
+purposes.
+
+Strings _MUST_ be represented as UTF-8 values.
+
+In addition to literal code points, a number of "escapes" are supported.
+"Escapes" are the character `\` followed by another character, and are
+interpreted as described in the following table:
+
+| Name                          | Escape | Code Pt  |
+|-------------------------------|--------|----------|
+| Line Feed                     | `\n`   | `U+000A` |
+| Carriage Return               | `\r`   | `U+000D` |
+| Character Tabulation (Tab)    | `\t`   | `U+0009` |
+| Reverse Solidus (Backslash)   | `\\`   | `U+005C` |
+| Solidus (Forwardslash)        | `\/`   | `U+002F` |
+| Quotation Mark (Double Quote) | `\"`   | `U+0022` |
+| Backspace                     | `\b`   | `U+0008` |
+| Form Feed                     | `\f`   | `U+000C` |
+| Unicode Escape                | `\u{(1-6 hex chars)}` | Code point described by hex characters, up to `10FFFF` |
+
+### Raw String
+
+Raw Strings in KDL are much like [Quoted Strings](#quoted-string), except they
+do not support `\`-escapes. They otherwise share the same properties as far as
+literal [Newline](#newline) characters go, and the requirement of UTF-8
+representation.
+
+Raw String literals are represented as `r`, followed by zero or more `#`
+characters, followed by `"`, followed by any number of UTF-8 literals. The
+string is then closed by a `"` followed by a _matching_ number of `#`
+characters. This allows them to contain raw `"` or `#` characters; only the
+precise terminator (resembling `"##`, for example) ends the raw string. This
+means that the string sequence `"` or `"#` and such must not match the closing
+`"` with the same or more `#` characters as the opening `r`.
+
+#### Example
+
+```kdl
+just-escapes r"\n will be literal"
+quotes-and-escapes r#"hello\n\r\asd"world"#
+```
+
+### Number
+
+Numbers in KDL represent numerical [Values](#value). There is no logical distinction in KDL
+between real numbers, integers, and floating point numbers. It's up to
+individual implementations to determine how to represent KDL numbers.
+
+There are four syntaxes for Numbers: Decimal, Hexadecimal, Octal, and Binary.
+
+* All numbers may optionally start with one of `-` or `+`, which determine whether they'll be positive or negative.
+* Binary numbers start with `0b` and only allow `0` and `1` as digits, which may be separated by `_`. They represent numbers in radix 2.
+* Octal numbers start with `0o` and only allow digits between `0` and `7`, which may be separated by `_`. They represent numbers in radix 8.
+* Hexadecimal numbers start with `0x` and allow digits between `0` and `9`, as well as letters `A` through `F`, in either lower or upper case, which may be separated by `_`. They represent numbers in radix 16.
+* Decimal numbers are a bit more special:
+    * They have no radix prefix.
+    * They use digits `0` through `9`, which may be separated by `_`.
+    * They may optionally include a decimal separator `.`, followed by more digits, which may again be separated by `_`.
+    * They may optionally be followed by `E` or `e`, an optional `-` or `+`, and more digits, to represent an exponent value.
+
+### Boolean
+
+A boolean [Value](#value) is either the symbol `true` or `false`. These
+_SHOULD_ be represented by implementation as boolean logical values, or some
+approximation thereof.
+
+#### Example
+
+```kdl
+my-node true value=false
+```
+
+### Null
+
+The symbol `null` represents a null [Value](#value). It's up to the
+implementation to decide how to represent this, but it generally signals the
+"absence" of a value. It is reasonable for an implementation to ignore null
+values altogether when deserializing.
+
+#### Example
+
+```kdl
+my-node null key=null
+```
+
+### Whitespace
+
+The following characters should be treated as non-[Newline](#newline) [white
+space](https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt):
+
+| Name                 | Code Pt |
+|----------------------|---------|
+| Character Tabulation | `U+0009`  |
+| Space                | `U+0020`  |
+| No-Break Space       | `U+00A0`  |
+| Ogham Space Mark     | `U+1680`  |
+| En Quad              | `U+2000`  |
+| Em Quad              | `U+2001`  |
+| En Space             | `U+2002`  |
+| Em Space             | `U+2003`  |
+| Three-Per-Em Space   | `U+2004`  |
+| Four-Per-Em Space    | `U+2005`  |
+| Six-Per-Em Space     | `U+2006`  |
+| Figure Space         | `U+2007`  |
+| Punctuation Space    | `U+2008`  |
+| Thin Space           | `U+2009`  |
+| Hair Space           | `U+200A`  |
+| Narrow No-Break Space| `U+202F`  |
+| Medium Mathematical Space | `U+205F`  |
+| Ideographic Space    | `U+3000`  |
+
+#### Multi-line comments
+
+In addition to single-line comments using `//`, comments can also be started
+with `/*` and ended with `*/`. These comments can span multiple lines. They
+are allowed in all positions where [Whitespace](#whitespace) is allowed and
+can be nested.
+
+### Newline
+
+The following characters [should be treated as new
+lines](https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-5/#G41643):
+
+| Acronym | Name            | Code Pt |
+|---------|-----------------|---------|
+| CRLF    | Carriage Return and Line Feed | `U+000D` + `U+000A` |
+| CR      | Carriage Return | `U+000D`  |
+| LF      | Line Feed       | `U+000A`  |
+| NEL     | Next Line       | `U+0085`  |
+| FF      | Form Feed       | `U+000C`  |
+| LS      | Line Separator  | `U+2028`  |
+| PS      | Paragraph Separator | `U+2029` |
+
+Note that for the purpose of new lines, CRLF is considered _a single newline_. `VT` `Vertical tab` `U+000B` was mistakenly excluded, but the v1 spec if frozen, so it's left unchanged.
+
+## Full Grammar
+
+```
+nodes := linespace* (node nodes?)? linespace*
+
+node := ('/-' node-space*)? type? identifier (node-space+ node-prop-or-arg)* (node-space* node-children ws*)? node-space* node-terminator
+node-prop-or-arg := ('/-' node-space*)? (prop | value)
+node-children := ('/-' node-space*)? '{' nodes '}'
+node-space := ws* escline ws* | ws+
+node-terminator := single-line-comment | newline | ';' | eof
+
+identifier := string | bare-identifier
+bare-identifier := ((identifier-char - digit - sign) identifier-char* | sign ((identifier-char - digit) identifier-char*)?) - keyword
+identifier-char := unicode - linespace - [\/(){}<>;[]=,"]
+keyword := boolean | 'null'
+prop := identifier '=' value
+value := type? (string | number | keyword)
+type := '(' identifier ')'
+
+string := raw-string | escaped-string
+escaped-string := '"' character* '"'
+character := '\' escape | [^\"]
+escape := ["\\/bfnrt] | 'u{' hex-digit{1, 6} '}'
+hex-digit := [0-9a-fA-F]
+
+raw-string := 'r' raw-string-hash
+raw-string-hash := '#' raw-string-hash '#' | raw-string-quotes
+raw-string-quotes := '"' .* '"'
+
+number := hex | octal | binary | decimal
+
+decimal := sign? integer ('.' integer)? exponent?
+exponent := ('e' | 'E') sign? integer
+integer := digit (digit | '_')*
+digit := [0-9]
+sign := '+' | '-'
+
+hex := sign? '0x' hex-digit (hex-digit | '_')*
+octal := sign? '0o' [0-7] [0-7_]*
+binary := sign? '0b' ('0' | '1') ('0' | '1' | '_')*
+
+boolean := 'true' | 'false'
+
+escline := '\\' ws* (single-line-comment | newline)
+
+linespace := newline | ws | single-line-comment
+
+newline := See Table (All line-break white_space)
+
+ws := bom | unicode-space | multi-line-comment
+
+bom := '\u{FEFF}'
+
+unicode-space := See Table (All White_Space unicode characters which are not `newline`)
+
+single-line-comment := '//' ^newline+ (newline | eof)
+multi-line-comment := '/*' commented-block
+commented-block := '*/' | (multi-line-comment | '*' | '/' | [^*/]+) commented-block
+```

XML-IN-KDL.md

@@ -25,7 +25,7 @@ XML elements and KDL nodes have a direct correspondence. In XiK, an XML element
 * making the attributes into KDL properties
 * making the child nodes as KDL child nodes
 
-For example, the XML `<element foo="bar"><child baz="qux" /></element>` is encoded into XiK as `element foo=bar { child baz=quux }`.
+For example, the XML `<element foo="bar"><child baz="quux" /></element>` is encoded into XiK as `element foo=bar { child baz=quux }`.
 
 XML namespaces are encoded the same as XML: the node name simply contains a `:` character. Note that KDL identifier syntax allows `:` directly in an ident, so a name like `xml:space` or `xlink:href` is a valid node or property name.
 

examples/Cargo.kdl

@@ -1,7 +1,7 @@
 package {
     name kdl
     version "0.0.0"
-    description "kat's document language"
+    description "The kdl document language"
     authors "Kat Marchán <kzm@zkat.tech>"
     license-file LICENSE.md
     edition "2018"

examples/ci.kdl

@@ -19,8 +19,8 @@ jobs {
         components rustfmt
         override #true
       }
-      step rustfmt run="cargo fmt --all -- --check"
-      step docs run="cargo doc --no-deps"
+      step rustfmt { run cargo fmt --all -- --check }
+      step docs { run cargo doc --no-deps }
     }
   }
   build_and_test "Build & Test" {
@@ -40,13 +40,13 @@ jobs {
         components clippy
         override #true
       }
-      step Clippy run="cargo clippy --all -- -D warnings"
-      step "Run tests" run="cargo test --all --verbose"
-      step "Other Stuff" run="
+      step Clippy { run cargo clippy --all -- -D warnings }
+      step "Run tests" { run cargo test --all --verbose }
+      step "Other Stuff" run="""
         echo foo
         echo bar
-          echo baz
-      "
+        echo baz
+        """
     }
   }
 }

examples/kdl-schema.kdl

@@ -290,7 +290,7 @@ document {
                                     type number
                                 }
                             }
-                            node >= description="Only used for numeric values. Constrains them to be greater than or equal to the given number(s)" {
+                            node ">=" description="Only used for numeric values. Constrains them to be greater than or equal to the given number(s)" {
                                 max 1
                                 value {
                                     min 1
@@ -306,7 +306,7 @@ document {
                                     type number
                                 }
                             }
-                            node <= description="Only used for numeric values. Constrains them to be less than or equal to the given number(s)" {
+                            node "<=" description="Only used for numeric values. Constrains them to be less than or equal to the given number(s)" {
                                 max 1
                                 value {
                                     min 1

examples/website.kdl

@@ -6,13 +6,13 @@ html lang=en {
         meta \
             name=description \
             content="kdl is a document language, mostly based on SDLang, with xml-like semantics that looks like you're invoking a bunch of CLI commands!"
-        title "kdl - Kat's Document Language"
+        title "kdl - The KDL Document Language"
         link rel=stylesheet href="/styles/global.css"
     }
     body {
         main {
             header class="py-10 bg-gray-300" {
-                h1 class="text-4xl text-center" "kdl - Kat's Document Language"
+                h1 class="text-4xl text-center" "kdl - The KDL Document Language"
             }
             section class=kdl-section id=description {
                 p {

tests/README.md

@@ -2,9 +2,11 @@
 
 The `input` folder contains test cases for KDL parsers. The `expected_kdl`
 folder contains files with the same name as those in `input` with the expected
-output after being run through the parser and printed out again. If there's no
-file in `expected_kdl` with a name corresponding to one in `input` it
-indicates that parsing for that case should fail.
+output after being run through the parser and printed out again.
+
+If a testcase is intended to fail parsing,
+the `input` file _MUST_ have a `_fail` suffix,
+and there must be no corresponding file in `expected_kdl`.
 
 ## Translation Rules
 
@@ -52,3 +54,7 @@ please send a PR.
 If you think the disagreement is due to a genuine error or oversight in the
 KDL specification, please open an issue explaining the matter and the change
 will be considered for the next version of the KDL spec.
+
+# Benchmarks
+
+The `benchmarks` folder contains some large or gnarly documents intended to be used to stress-test your parser and help with profiling. They are intentionally not part of the testsuite, and just provided for your own personal benefit.

tests/test_cases/expected_kdl/braces_in_bare_id.kdl

@@ -0,0 +1,3 @@
+foo123 {
+    bar
+}

tests/test_cases/expected_kdl/esc_multiple_newlines.kdl

@@ -0,0 +1 @@
+node "12"

tests/test_cases/expected_kdl/escline_after_semicolon.kdl

@@ -0,0 +1,2 @@
+node
+node

tests/test_cases/expected_kdl/escline_alone.kdl

@@ -0,0 +1 @@
+

tests/test_cases/expected_kdl/escline_empty_line.kdl

@@ -0,0 +1 @@
+node

tests/test_cases/expected_kdl/escline_end_of_node.kdl

@@ -0,0 +1,2 @@
+a
+b

tests/test_cases/expected_kdl/escline_in_child_block.kdl

@@ -0,0 +1,4 @@
+parent {
+    child
+    child
+}

tests/test_cases/expected_kdl/escline_node_type.kdl

@@ -0,0 +1 @@
+(type)node

tests/test_cases/expected_kdl/escline_slashdash.kdl

@@ -0,0 +1 @@
+node

tests/test_cases/expected_kdl/floating_point_keywords.kdl

@@ -0,0 +1 @@
+floats #inf #-inf #nan

tests/test_cases/expected_kdl/initial_slashdash.kdl

@@ -0,0 +1 @@
+another-node

tests/test_cases/expected_kdl/multiline_raw_string_containing_quotes.kdl

@@ -0,0 +1 @@
+node "\"\"\"triple-quote\"\"\"\n##\"too few quotes\"##\n#\"\"\"too few #\"\"\"#"

tests/test_cases/expected_kdl/multiline_raw_string_empty.kdl

@@ -0,0 +1 @@
+node ""

tests/test_cases/expected_kdl/multiline_raw_string_empty_indented.kdl

@@ -0,0 +1 @@
+node ""

tests/test_cases/expected_kdl/multiline_raw_string_indented.kdl

@@ -0,0 +1 @@
+node "  hey\n everyone\n   how goes?"

tests/test_cases/expected_kdl/multiline_string_containing_quotes.kdl

@@ -0,0 +1 @@
+node "this string contains \"quotes\", twice\"\""

tests/test_cases/expected_kdl/multiline_string_double_backslash.kdl

@@ -0,0 +1 @@
+node "a\\ b\na\\b"

tests/test_cases/expected_kdl/multiline_string_empty.kdl

@@ -0,0 +1 @@
+node ""

tests/test_cases/expected_kdl/multiline_string_empty_indented.kdl

@@ -0,0 +1 @@
+node ""

tests/test_cases/expected_kdl/multiline_string_escape_delimiter.kdl

@@ -0,0 +1 @@
+node "\"\"\""

tests/test_cases/expected_kdl/multiline_string_escape_in_closing_line.kdl

@@ -0,0 +1 @@
+node "foo bar\nbaz"

tests/test_cases/expected_kdl/multiline_string_escape_in_closing_line_shallow.kdl

@@ -0,0 +1 @@
+node "  foo bar\n  baz"

tests/test_cases/expected_kdl/multiline_string_escape_newline_at_end.kdl

@@ -0,0 +1 @@
+node " a"

tests/test_cases/expected_kdl/multiline_string_indented.kdl

@@ -0,0 +1 @@
+node "  hey\n everyone\n   how goes?"

tests/test_cases/expected_kdl/multiline_string_only_2_quotes.kdl

@@ -0,0 +1 @@
+node "\"\""

tests/test_cases/expected_kdl/multiline_string_whitespace_only.kdl

@@ -0,0 +1 @@
+node "" "" "" "\n\n    " "\n"

tests/test_cases/expected_kdl/multiline_string_wrapped_binary.kdl

@@ -0,0 +1 @@
+node deadbeef

tests/test_cases/expected_kdl/slashdash_escline_before_arg_type.kdl

@@ -0,0 +1 @@
+node arg2

tests/test_cases/expected_kdl/slashdash_escline_before_children.kdl

@@ -0,0 +1 @@
+node arg1

tests/test_cases/expected_kdl/slashdash_escline_before_node.kdl

@@ -0,0 +1 @@
+node2

tests/test_cases/expected_kdl/slashdash_false_node.kdl

@@ -0,0 +1 @@
+node foo bar

tests/test_cases/expected_kdl/slashdash_multi_line_comment_entry.kdl

@@ -0,0 +1 @@
+node 1 3

tests/test_cases/expected_kdl/slashdash_multi_line_comment_inline.kdl

@@ -0,0 +1 @@
+node 1 3

tests/test_cases/expected_kdl/slashdash_multiple_child_blocks.kdl

@@ -0,0 +1,3 @@
+node foo {
+    three
+}

tests/test_cases/expected_kdl/slashdash_newline_before_children.kdl

@@ -0,0 +1 @@
+node 1 2

tests/test_cases/expected_kdl/slashdash_newline_before_entry.kdl

@@ -0,0 +1 @@
+node 1 3

tests/test_cases/expected_kdl/slashdash_newline_before_node.kdl

@@ -0,0 +1 @@
+

tests/test_cases/expected_kdl/slashdash_single_line_comment_entry.kdl

@@ -0,0 +1 @@
+node 1 3

tests/test_cases/expected_kdl/slashdash_single_line_comment_node.kdl

@@ -0,0 +1 @@
+node2

tests/test_cases/expected_kdl/unicode_equals_signs.kdl

@@ -1 +0,0 @@
-node p1=val1 p2=val2 p3=val3

tests/test_cases/expected_kdl/unicode_silly.kdl

@@ -0,0 +1 @@
+ノード お名前=ฅ^•ﻌ•^ฅ

tests/test_cases/expected_kdl/unusual_bare_id_chars_in_quoted_id.kdl

@@ -1 +1 @@
-foo123~!@$%^&*.:'|?+<>, weeee
+foo123~!@$%^&*.:'|?+<>,`-_ weeee

tests/test_cases/expected_kdl/unusual_chars_in_bare_id.kdl

@@ -1 +1 @@
-foo123~!@$%^&*.:'|?+<>, weeee
+foo123~!@$%^&*.:'|?+<>,`-_ weeee

tests/test_cases/expected_kdl/vertical_tab_whitespace.kdl

@@ -1 +1,2 @@
 node arg
+node2 arg2

tests/test_cases/expected_kdl/zero_arg.kdl

@@ -1 +0,0 @@
-node 0

tests/test_cases/expected_kdl/zero_space_before_slashdash_arg.kdl

@@ -0,0 +1 @@
+node string

tests/test_cases/expected_kdl/zero_space_before_slashdash_children.kdl

@@ -0,0 +1,2 @@
+node string
+node string

tests/test_cases/expected_kdl/zero_space_before_slashdash_prop.kdl

@@ -0,0 +1 @@
+node string

tests/test_cases/input/braces_in_bare_id.kdl

@@ -0,0 +1 @@
+foo123{bar}

tests/test_cases/input/commented_node.kdl

@@ -1,2 +1,3 @@
 /- node_1
 node_2
+/- node_3

tests/test_cases/input/esc_multiple_newlines.kdl

@@ -0,0 +1,4 @@
+node "1\
+
+
+2"

tests/test_cases/input/escaped_whitespace.kdl

@@ -1,10 +1,10 @@
 // All of these strings are the same
 node \
 	"Hello\n\tWorld" \
-	"
+	"""
 	Hello
 		World
-	" \
+	""" \
 	"Hello\n\      \tWorld" \
 	"Hello\n\
     \tWorld" \

tests/test_cases/input/escline_after_semicolon.kdl

@@ -0,0 +1,2 @@
+node; \
+node

tests/test_cases/input/escline_alone.kdl

@@ -0,0 +1 @@
+\

tests/test_cases/input/escline_empty_line.kdl

@@ -0,0 +1,3 @@
+\
+
+node

tests/test_cases/input/escline_end_of_node.kdl

@@ -0,0 +1,3 @@
+a \
+
+b

tests/test_cases/input/escline_in_child_block.kdl

@@ -0,0 +1,5 @@
+parent {
+    child
+    \ // comment
+    child
+}

tests/test_cases/input/escline_node.kdl

@@ -1,2 +1,3 @@
 node1
+\
 node2

tests/test_cases/input/escline_node_type.kdl

@@ -0,0 +1,2 @@
+\
+(type)node

tests/test_cases/input/escline_slashdash.kdl

@@ -0,0 +1,4 @@
+node
+\
+/-
+node

tests/test_cases/input/floating_point_keyword_identifier_strings_fail.kdl

@@ -0,0 +1 @@
+floats inf -inf nan