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LessParser.g4
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LessParser.g4
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/*
[The "MIT licence"]
Copyright (c) 2014 Kyle Lee
All rights reserved.
*/
parser grammar LessParser;
options { tokenVocab=LessLexer; }
stylesheet
: statement*
;
statement
: importDeclaration
| ruleset
| variableDeclaration ';'
| mixinDefinition
;
variableName
: AT variableName
| AT Identifier
;
commandStatement
: (expression+) mathStatement?
;
mathCharacter
: TIMES | PLUS | DIV | MINUS | PERC
;
mathStatement
: mathCharacter commandStatement
;
expression
: measurement
| identifier
| identifier LPAREN values? RPAREN
| Color
| StringLiteral
| url
| variableName
;
function
: FUNCTION_NAME LPAREN values? RPAREN
;
conditions
: condition ((AND|COMMA) condition)*
;
condition
: LPAREN conditionStatement RPAREN
| NOT LPAREN conditionStatement RPAREN
;
conditionStatement
: commandStatement ( EQ | LT | GT | GTEQ | LTEQ ) commandStatement
| commandStatement
;
variableDeclaration
: variableName COLON values
;
//Imports
importDeclaration
: '@import' referenceUrl mediaTypes? ';'
;
referenceUrl
: StringLiteral
| UrlStart Url UrlEnd
;
mediaTypes
: (Identifier (COMMA Identifier)*)
;
//Rules
ruleset
: selectors block
;
block
: BlockStart (property ';' | statement | mixinReference)* property? BlockEnd
;
mixinDefinition
: selectors LPAREN (mixinDefinitionParam (';' mixinDefinitionParam)*)? Ellipsis? RPAREN mixinGuard? block
;
mixinGuard
: WHEN conditions
;
mixinDefinitionParam
: variableName
| variableDeclaration
;
mixinReference
: selector LPAREN values? RPAREN IMPORTANT? ';'
;
selectors
: selector (COMMA selector)*
;
selector
: element+ (selectorPrefix element)* attrib* pseudo?
;
attrib
: '[' Identifier (attribRelate (StringLiteral | Identifier))? ']'
;
pseudo
: (COLON|COLONCOLON) Identifier
;
element
: identifier
| '#' identifier
| '.' identifier
| PARENTREF
| '*'
;
selectorPrefix
: (GT | PLUS | TIL)
;
attribRelate
: '='
| '~='
| '|='
;
identifier
: Identifier identifierPart*
| InterpolationStart identifierVariableName BlockEnd identifierPart*
;
identifierPart
: InterpolationStartAfter identifierVariableName BlockEnd
| IdentifierAfter
;
identifierVariableName
: (Identifier | IdentifierAfter)
;
property
: identifier COLON values
;
values
: commandStatement (COMMA commandStatement)*
;
url
: UrlStart Url UrlEnd
;
measurement
: Number Unit?
;