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主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
79 行
3.6 KiB
79 行
3.6 KiB
grammar = - ( d:definition { d; }
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| end-of-file { nil; }
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)
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definition = i:identifier ASSIGN e:expression SEMI? { Definition.new(name: i, expression: e); }
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expression = s:sequence !BAR { s; }
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| s1:sequence { s1 = Alternation.new().push(s1); }
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( BAR s2:sequence { s1.push(s2); }
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) * { s1; }
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sequence = p:prefix ( q:prefix { p = Sequence.new().push(p).push(q); }
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( q:prefix { p.push(q); }
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) * ) ? { p; }
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prefix = AND a:action { ParseTimeAction.new(action: a); }
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| AT a:action { ExecuteAction.new(action: a); }
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( AND s:suffix { And.new(expression: s); }
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| NOT s:suffix { Not.new(expression: s); }
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| s:suffix { s; }
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)
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suffix = p:primary
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( QUERY { p = Optional.new(expression: p); }
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| STAR { p = Star.new(expression: p); }
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| PLUS { p = Plus.new(expression: p); }
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) ? { p; }
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primary = i1:identifier COLON i2:ruleCall !ASSIGN { Assignment.new(name: i1, rule: i2); }
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| i:ruleCall !ASSIGN { i; }
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| LPAREN e:expression RPAREN { e; }
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| l:literal { l; }
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| c:class { c; }
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| DOT { Dot.new(); }
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| a:action { a; }
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| BEGIN e:expression END { Capture.new(expression: e); }
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identifier = < [-a-zA-Z_][-a-zA-Z_0-9]* > - { intern(yytext); }
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ruleCall = n:identifier CCOLON r:identifier { NamespacedRuleCall.new(namespace: n, name: r); }
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| i:identifier { RuleCall.new(name: i); }
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literal = ['] < ( !['] char )* > ['] - { StringLiteral.new(string: yytext); }
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| ["] < ( !["] char )* > ["] - { StringLiteral.new(string: yytext); }
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class = '[' < ( !']' range )* > ']' - { CharacterClass.new(value: yytext); }
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range = char '-' char | char
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char = '\\' [abefnrtv'"\[\]\\]
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| '\\' [0-3][0-7][0-7]
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| '\\' [0-7][0-7]?
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| !'\\' .
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action = m:metaLanguage::block - { Action.new(parseTree: Block.new(body: m)); }
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- = ( space | comment )*
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space = ' ' | '\t' | end-of-line
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comment = '#' ( !end-of-line . )* end-of-line
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end-of-line = '\r\n' | '\n' | '\r'
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end-of-file = !.
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BAR = '|' -
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NOT = '!' -
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QUERY = '?' -
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BEGIN = '<' -
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END = '>' -
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SEMI = ";" -
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CCOLON = "::" -
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LPAREN = "(" -
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RPAREN = ")" -
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ASSIGN = "=" ![=] -
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AND = "&" ![&=] -
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PLUS = "+" ![+=] -
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STAR = "*" ![=] -
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DOT = "." ![.] -
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COLON = ":" ![:] -
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AT = "@" -
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