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Add Langium Language (#7649)
* Add Langium Language * added unique id * swap c4 w/ ox
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‎.gitmodules‎

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[submodule "vendor/grammars/language-kotlin"]
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path = vendor/grammars/language-kotlin
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url = https://github.com/nishtahir/language-kotlin
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[submodule "vendor/grammars/language-langium"]
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path = vendor/grammars/language-langium
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url = https://github.com/eclipse-langium/language-langium.git
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[submodule "vendor/grammars/language-less"]
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path = vendor/grammars/language-less
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url = https://github.com/atom/language-less.git

‎grammars.yml‎

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- source.kickstart
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vendor/grammars/language-kotlin:
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- source.kotlin
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vendor/grammars/language-langium:
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- source.langium
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vendor/grammars/language-less:
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- source.css.less
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vendor/grammars/language-m68k:

‎lib/linguist/languages.yml‎

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codemirror_mode: xml
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codemirror_mime_type: text/xml
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language_id: 194
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Langium:
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type: programming
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color: "#2c8c87"
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extensions:
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- ".langium"
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tm_scope: source.langium
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ace_mode: text
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language_id: 548603830
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Lark:
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type: data
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color: "#2980B9"

‎samples/Langium/ox.langium‎

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grammar Ox
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entry OxProgram:
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elements+=OxElement*;
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OxElement:
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Block |
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IfStatement |
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WhileStatement |
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ForStatement |
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FunctionDeclaration |
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VariableDeclaration ';' |
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AssignmentStatement ';' |
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PrintStatement ';' |
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ReturnStatement ';' |
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Expression ';'
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;
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IfStatement:
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'if' '(' condition=Expression ')' block=Block
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('else' elseBlock=Block)?
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;
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WhileStatement:
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'while' '(' condition=Expression ')' block=Block
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;
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ForStatement:
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'for' '(' counter=VariableDeclaration? ';' condition=Expression? ';' execution=AssignmentStatement? ')' block=Block
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;
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PrintStatement: 'print' value=Expression;
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ReturnStatement: 'return' value=Expression?;
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Block: '{'
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elements+=OxElement*
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'}';
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VariableDeclaration returns NamedElement:
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{infer VariableDeclaration} 'var' name=ID (':' type=TypeReference) (assignment?='=' value=Expression)?
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;
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AssignmentStatement:
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varRef=[VariableDeclaration:ID] '=' value=Expression
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;
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Expression:
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Addition;
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Addition infers Expression:
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Multiplication ({infer BinaryExpression.left=current} operator=('+' | '-') right=Multiplication)*;
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Multiplication infers Expression:
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Logical ({infer BinaryExpression.left=current} operator=('*' | '/') right=Logical)*;
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Logical infers Expression:
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Comparison ({infer BinaryExpression.left=current} operator=('and' | 'or') right=Comparison)*;
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Comparison infers Expression:
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Primary ({infer BinaryExpression.left=current} operator=('<' | '<=' | '>' | '>=' | '==' | '!=') right=Primary)*;
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Primary infers Expression:
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'(' Expression ')' |
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UnaryExpression |
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BooleanLiteral |
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NumberLiteral |
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MemberCall;
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MemberCall:
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element=[NamedElement:ID]
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(
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explicitOperationCall?='('
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(
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arguments+=Expression (',' arguments+=Expression)*
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)?
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')'
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)?;
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UnaryExpression:
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operator=('!' | '-') value=Expression;
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NumberLiteral: value=NUMBER;
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BooleanLiteral: value?='true' | 'false';
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FunctionDeclaration:
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'fun' name=ID '(' (parameters+=Parameter (',' parameters+=Parameter)*)? ')' ':' returnType=TypeReference body=Block;
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Parameter: name=ID ':' type=TypeReference;
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TypeReference: primitive=("number" | "boolean" | "void");
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type NamedElement = Parameter | FunctionDeclaration | VariableDeclaration;
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hidden terminal WS: /\s+/;
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terminal ID: /[_a-zA-Z][\w_]*/;
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terminal NUMBER returns number: /[0-9]+(\.[0-9]+)?/;
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// terminal STRING: /"[^"]*"/;
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hidden terminal ML_COMMENT: /\/\*[\s\S]*?\*\//;
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hidden terminal SL_COMMENT: /\/\/[^\n\r]*/;

‎samples/Langium/treemap.langium‎

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/**
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* Treemap grammar for Langium
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* Converted from mindmap grammar
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*
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* The ML_COMMENT and NL hidden terminals handle whitespace, comments, and newlines
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* before the treemap keyword, allowing for empty lines and comments before the
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* treemap declaration.
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*/
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grammar TreemapGrammar
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fragment TitleAndAccessibilities:
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((accDescr=ACC_DESCR | accTitle=ACC_TITLE | title=TITLE))+
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;
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terminal BOOLEAN returns boolean: 'true' | 'false';
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terminal ACC_DESCR: /[\t ]*accDescr(?:[\t ]*:([^\n\r]*?(?=%%)|[^\n\r]*)|\s*{([^}]*)})/;
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terminal ACC_TITLE: /[\t ]*accTitle[\t ]*:(?:[^\n\r]*?(?=%%)|[^\n\r]*)/;
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terminal TITLE: /[\t ]*title(?:[\t ][^\n\r]*?(?=%%)|[\t ][^\n\r]*|)/;
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// Interface declarations for data types
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interface Item {
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name: string
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classSelector?: string // For ::: class
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}
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interface Section extends Item {
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}
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interface Leaf extends Item {
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value: number
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}
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interface ClassDefStatement {
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className: string
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styleText: string // Optional style text
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}
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interface Treemap {
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TreemapRows: TreemapRow[]
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title?: string
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accTitle?: string
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accDescr?: string
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}
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entry Treemap returns Treemap:
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TREEMAP_KEYWORD
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(
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TitleAndAccessibilities
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| TreemapRows+=TreemapRow
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)*;
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terminal TREEMAP_KEYWORD: 'treemap-beta' | 'treemap';
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terminal CLASS_DEF: /classDef\s+([a-zA-Z_][a-zA-Z0-9_]+)(?:\s+([^;\r\n]*))?(?:;)?/;
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terminal STYLE_SEPARATOR: ':::';
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terminal SEPARATOR: ':';
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terminal COMMA: ',';
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hidden terminal WS: /[ \t]+/; // One or more spaces or tabs for hidden whitespace
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hidden terminal ML_COMMENT: /\%\%[^\n]*/;
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hidden terminal NL: /\r?\n/;
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TreemapRow:
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indent=INDENTATION? (item=Item | ClassDef);
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// Class definition statement handled by the value converter
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ClassDef returns string:
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CLASS_DEF;
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Item returns Item:
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Leaf | Section;
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// Use a special rule order to handle the parsing precedence
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Section returns Section:
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name=STRING2 (STYLE_SEPARATOR classSelector=ID2)?;
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Leaf returns Leaf:
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name=STRING2 INDENTATION? (SEPARATOR | COMMA) INDENTATION? value=MyNumber (STYLE_SEPARATOR classSelector=ID2)?;
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// This should be processed before whitespace is ignored
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terminal INDENTATION: /[ \t]{1,}/; // One or more spaces/tabs for indentation
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// Keywords with fixed text patterns
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terminal ID2: /[a-zA-Z_][a-zA-Z0-9_]*/;
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// Define as a terminal rule
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terminal NUMBER2: /[0-9_\.\,]+/;
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// Then create a data type rule that uses it
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MyNumber returns number: NUMBER2;
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terminal STRING2: /"[^"]*"|'[^']*'/;
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// Modified indentation rule to have higher priority than WS

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