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WilstonOreoWilstonOreo
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Add lexer for microcad (#1171)
µcad is a domain specific language for CAD and is hosted on https://codeberg.org/microcad/microcad/ , which uses forgejo, which uses chroma. We want to have syntax highlighting support for µcad on Codeberg, hence the PR.
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‎lexers/embedded/microcad.xml‎

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<lexer>
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<config>
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<name>microcad</name>
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<alias>µcad</alias>
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<filename>*.µcad</filename>
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<filename>*.ucad</filename>
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<filename>*.mcad</filename>
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<mime_type>text/microcad</mime_type>
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<ensure_nl>true</ensure_nl>
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</config>
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<rules>
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<!-- Root state -->
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<state name="root">
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<rule pattern="\n">
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<token type="TextWhitespace"/>
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</rule>
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<rule pattern="\s+">
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<token type="TextWhitespace"/>
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</rule>
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<!-- COMMENTS -->
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<rule pattern="///.*">
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<token type="LiteralStringDoc"/>
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</rule>
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<rule pattern="//.*">
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<token type="CommentSingle"/>
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</rule>
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<rule pattern="/\*.*">
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<token type="CommentMultiline"/>
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<push state="comment"/>
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</rule>
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<!-- KEYWORDS -->
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<rule pattern="\b(pub|sketch|part|op|mod|use|fn|const|prop|init|return|if|else|mat|__builtin|or|and|not|as)\b">
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<token type="Keyword"/>
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</rule>
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<!-- TYPES -->
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<rule pattern="\b(Integer|Scalar|String|Color|Length|Area|Volume|Angle|Weight|Density|Bool|Matrix[0-9])\b">
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<token type="KeywordType"/>
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</rule>
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<!-- FUNCTION NAMES -->
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<rule pattern="\b([a-z_][a-zA-Z0-9_]*)\s*(?=\()">
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<token type="NameFunction"/>
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</rule>
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<!-- OPERATORS -->
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<rule pattern="[+\-*/%&amp;|&lt;&gt;^!@=]">
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<token type="Operator"/>
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</rule>
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<!-- NUMBERS + UNITS -->
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<rule pattern="\b(([0-9]+(\.[0-9]+)?)(%|m²|cm²|mm²|µm²|in²|ft²|yd²|m³|cm³|mm³|µm³|in³|ft³|yd³|ml|cl|l|µl|cm|mm|m|µm|in|ft|yd|deg|°|grad|turn|rad|g|kg|lb|oz)?)|true|false\b">
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<token type="LiteralNumber"/>
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</rule>
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<!-- NAMESPACES -->
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<rule pattern="([a-z_][a-z0-9_]*)(::)">
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<bygroups>
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<token type="NameNamespace"/>
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<token type="Operator"/>
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</bygroups>
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</rule>
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<!-- CONSTANTS (ALL CAPS) -->
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<rule pattern="\b([A-Z_][A-Z0-9_]*)\b">
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<token type="NameConstant"/>
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</rule>
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<!-- CUSTOM TYPES (Capitalized identifiers) -->
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<rule pattern="\b([A-Z_][a-zA-Z0-9_]*)\b">
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<token type="NameClass"/>
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</rule>
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<!-- VARIABLES -->
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<rule pattern="\b([a-z_][a-zA-Z0-9_]*)\b">
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<token type="Name"/>
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</rule>
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<!-- STRINGS -->
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<rule pattern="&quot;[^&quot;]*&quot;">
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<token type="LiteralString"/>
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</rule>
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<!-- PAREN GROUP -->
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<rule pattern="[{}()\[\],.;:]">
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<token type="Punctuation"/>
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</rule>
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<!-- BRACE GROUP -->
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<rule pattern="\{">
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<token type="Punctuation"/>
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<push state="brace"/>
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</rule>
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<rule pattern="[\}\)]">
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<token type="Punctuation"/>
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</rule>
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</state>
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<!-- Parenthesized expression -->
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<state name="paren">
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<rule pattern="\)">
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<token type="Punctuation"/>
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<pop/>
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</rule>
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<rule>
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<include state="root"/>
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</rule>
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</state>
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<!-- Braced expression -->
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<state name="brace">
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<rule pattern="\}">
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<token type="Punctuation"/>
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<pop/>
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</rule>
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<rule>
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<include state="root"/>
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</rule>
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</state>
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<state name="comment">
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<!-- End of comment -->
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<rule pattern="\*/">
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<token type="CommentMultiline"/>
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<pop/>
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</rule>
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</state>
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</rules>
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</lexer>

‎lexers/testdata/microcad.actual‎

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// Copyright © 2025 The µcad authors <info@ucad.xyz>
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// SPDX-License-Identifier: AGPL-3.0-or-later
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use std::math::*;
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use std::ops::*;
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use std::geo3d::*;
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/// A CSG cube.
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part CsgCube(size: Length) {
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s = size / sqrt(2.1); /* Inline comment */
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body = Sphere(r = s) & Cube(size);
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holes = Cylinder(h = size, d = s).orient([X,Y,Z]);
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body - holes;
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}
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CsgCube(50mm);

‎lexers/testdata/microcad.expected‎

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[
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{"type":"CommentSingle","value":"// Copyright © 2025 The µcad authors \u003cinfo@ucad.xyz\u003e"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":"// SPDX-License-Identifier: AGPL-3.0-or-later"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"Keyword","value":"use"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameNamespace","value":"std"},
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{"type":"Operator","value":"::"},
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{"type":"NameNamespace","value":"math"},
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{"type":"Operator","value":"::*"},
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{"type":"Punctuation","value":";"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"Keyword","value":"use"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameNamespace","value":"std"},
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{"type":"Operator","value":"::"},
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{"type":"NameNamespace","value":"ops"},
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{"type":"Operator","value":"::*"},
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{"type":"Punctuation","value":";"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"Keyword","value":"use"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameNamespace","value":"std"},
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{"type":"Operator","value":"::"},
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{"type":"NameNamespace","value":"geo3d"},
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{"type":"Operator","value":"::*"},
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{"type":"Punctuation","value":";"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"LiteralStringDoc","value":"/// A CSG cube."},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"Keyword","value":"part"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameClass","value":"CsgCube"},
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{"type":"Punctuation","value":"("},
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{"type":"Name","value":"size"},
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{"type":"Punctuation","value":":"},
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{"type":"TextWhitespace","value":" "},
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{"type":"KeywordType","value":"Length"},
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{"type":"Punctuation","value":")"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"{"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Name","value":"s"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"size"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"/"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameFunction","value":"sqrt"},
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{"type":"Punctuation","value":"("},
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{"type":"LiteralNumber","value":"2.1"},
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{"type":"Punctuation","value":");"},
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{"type":"TextWhitespace","value":" "},
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{"type":"CommentMultiline","value":"/* Inline comment */"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Name","value":"body"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameClass","value":"Sphere"},
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{"type":"Punctuation","value":"("},
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{"type":"Name","value":"r"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"s"},
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{"type":"Punctuation","value":")"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"\u0026"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameClass","value":"Cube"},
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{"type":"Punctuation","value":"("},
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{"type":"Name","value":"size"},
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{"type":"Punctuation","value":");"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Name","value":"holes"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameClass","value":"Cylinder"},
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{"type":"Punctuation","value":"("},
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{"type":"Name","value":"h"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"size"},
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{"type":"Punctuation","value":","},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"d"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"="},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"s"},
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{"type":"Punctuation","value":")."},
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{"type":"NameFunction","value":"orient"},
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{"type":"Punctuation","value":"(["},
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{"type":"NameConstant","value":"X"},
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{"type":"Punctuation","value":","},
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{"type":"NameConstant","value":"Y"},
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{"type":"Punctuation","value":","},
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{"type":"NameConstant","value":"Z"},
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{"type":"Punctuation","value":"]);"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Name","value":"body"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Operator","value":"-"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Name","value":"holes"},
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{"type":"Punctuation","value":";"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"Punctuation","value":"}"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"NameClass","value":"CsgCube"},
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{"type":"Punctuation","value":"("},
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{"type":"LiteralNumber","value":"50mm"},
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{"type":"Punctuation","value":");"},
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{"type":"TextWhitespace","value":"\n"}
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]

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