57 lines
2.3 KiB
Plaintext
57 lines
2.3 KiB
Plaintext
grammar JavascriptRegexp
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root <- ( ( "/" regexp "/" flags:[yigmu]* ) / regexp flags:""? ) <Root>
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regexp <- match:match alternates:( "|" match )* <Regexp>
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match <- (!repeat) parts:match_fragment* <Match>
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anchor <- ( "^" / "$" ) <Anchor>
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match_fragment <- content:( anchor / subexp / charset / terminal ) repeat:repeat? <MatchFragment>
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repeat <- spec:( repeat_any / repeat_required / repeat_optional / repeat_spec ) greedy:"?"? <Repeat>
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repeat_any <- "*" <RepeatAny>
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repeat_required <- "+" <RepeatRequired>
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repeat_optional <- "?" <RepeatOptional>
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repeat_spec <- ( "{" min:[0-9]+ "," max:[0-9]+ "}"
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/ "{" min:[0-9]+ ",}"
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/ "{" exact:[0-9]+ "}" ) <RepeatSpec>
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subexp <- "(" capture:( "?:" / "?=" / "?!" )? regexp ")" <Subexp>
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charset <- "[" invert:"^"? parts:( charset_range / charset_terminal )* "]" <Charset>
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charset_range <- first:charset_range_terminal "-" last:charset_range_terminal <CharsetRange>
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charset_terminal <- charset_escape <CharsetEscape>
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/ charset_literal <Literal>
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charset_range_terminal <- charset_range_escape <CharsetEscape>
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/ charset_literal <Literal>
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charset_escape <- "\\" esc:(
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code:[bdDfnrsStvwW] arg:""?
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/ control_escape
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/ octal_escape
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/ hex_escape
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/ unicode_escape
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/ null_escape )
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charset_range_escape <- "\\" esc:(
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code:[bfnrtv] arg:""?
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/ control_escape
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/ octal_escape
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/ hex_escape
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/ unicode_escape
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/ null_escape )
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charset_literal <- ( ""? literal:[^\\\]] )
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/ ( literal:"\\" &"c" )
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/ ( "\\" literal:[^bdDfnrsStvwW] )
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terminal <- "." <AnyCharacter>
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/ escape <Escape>
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/ literal <Literal>
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escape <- "\\" esc:(
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code:[bBdDfnrsStvwW1-9] arg:""?
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/ control_escape
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/ octal_escape
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/ hex_escape
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/ unicode_escape
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/ null_escape )
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literal <- ( ""? literal:[^|\\/.\[\(\)?+*$^] )
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/ ( literal:"\\" &"c" )
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/ ( "\\" literal:. )
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control_escape <- code:"c" arg:[a-zA-Z]
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octal_escape <- code:"0" arg:[0-7]+
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hex_escape <- code:"x" arg:( [0-9a-fA-F] [0-9a-fA-F] )
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unicode_escape <- code:"u" arg:( [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] )
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null_escape <- code:"0" arg:""?
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