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149 lines
3.6 KiB
149 lines
3.6 KiB
# Setup PEG syntax parser
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Grammar <- Spacing Definition+ EndOfFile
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Definition <-
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Ignore IdentCont Parameters LEFTARROW Expression Instruction?
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/ Ignore Identifier LEFTARROW Expression Instruction?
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Expression <- Sequence (SLASH Sequence)*
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Sequence <- (CUT / Prefix)*
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Prefix <- (AND / NOT)? SuffixWithLabel
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SuffixWithLabel <- Suffix (LABEL Identifier)?
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Suffix <- Primary Loop?
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Loop <- QUESTION / STAR / PLUS / Repetition
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Primary <-
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Ignore IdentCont Arguments !LEFTARROW
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/ Ignore Identifier !(Parameters? LEFTARROW)
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/ OPEN Expression CLOSE
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/ BeginTok Expression EndTok
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/ BeginCapScope Expression EndCapScope
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/ BeginCap Expression EndCap
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/ BackRef
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/ LiteralI
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/ Dictionary
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/ Literal
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/ NegatedClassI
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/ NegatedClass
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/ ClassI
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/ Class
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/ DOT
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Identifier <- IdentCont Spacing
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IdentCont <- IdentStart IdentRest*
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IdentStart <- !"↑" !"⇑" ([a-zA-Z_%] / [\u0080-\uFFFF])
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IdentRest <- IdentStart / [0-9]
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Dictionary <- LiteralD (PIPE LiteralD)+
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lit_ope <-
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['] <(!['] Char)*> ['] Spacing
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/ ["] <(!["] Char)*> ["] Spacing
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Literal <- lit_ope
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LiteralD <- lit_ope
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LiteralI <-
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['] <(!['] Char)*> "'i" Spacing
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/ ["] <(!["] Char)*> '"i' Spacing
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# NOTE: The original Brian Ford's paper uses 'zom' instead of 'oom'.
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Class <- '[' !'^' <(!']' Range)+> ']' Spacing
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ClassI <- '[' !'^' <(!']' Range)+> ']i' Spacing
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NegatedClass <- "[^" <(!']' Range)+> ']' Spacing
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NegatedClassI <- "[^" <(!']' Range)+> ']i' Spacing
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Range <- (Char '-' ! ']' Char) / Char
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Char <-
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'\\' [nrt'\"[\]\\^]
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/ '\\' [0-3] [0-7] [0-7]
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/ '\\' [0-7] [0-7]?
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/ "\\x" [0-9a-fA-F] [0-9a-fA-F]?
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/ "\\u" (((('0' [0-9a-fA-F]) / "10") [0-9a-fA-F]{4,4}) / [0-9a-fA-F]{4,5})
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/ !'\\' .
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Repetition <- BeginBracket RepetitionRange EndBracket
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RepetitionRange <-
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Number COMMA Number
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/ Number COMMA
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/ Number
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/ COMMA Number
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Number <- [0-9]+ Spacing
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LEFTARROW <- ("<-" / "←") Spacing
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~SLASH <- '/' Spacing
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~PIPE <- '|' Spacing
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AND <- '&' Spacing
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NOT <- '!' Spacing
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QUESTION <- '?' Spacing
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STAR <- '*' Spacing
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PLUS <- '+' Spacing
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~OPEN <- '(' Spacing
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~CLOSE <- ')' Spacing
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DOT <- '.' Spacing
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CUT <- "↑" Spacing
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~LABEL <- ('^' / "⇑") Spacing
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~Spacing <- (Space / Comment)*
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Comment <- '#' (!EndOfLine . )*
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Space <- ' ' / '\t' / EndOfLine
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EndOfLine <- "\r\n" / '\n' / '\r'
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EndOfFile <- ! .
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~BeginTok <- '<' Spacing
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~EndTok <- '>' Spacing
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~BeginCapScope <- '$' '(' Spacing
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~EndCapScope <- ')' Spacing
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BeginCap <- '$' <IdentCont> '<' Spacing
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~EndCap <- '>' Spacing
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BackRef <- '$' <IdentCont> Spacing
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IGNORE <- '~'
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Ignore <- IGNORE?
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Parameters <- OPEN Identifier (COMMA Identifier)* CLOSE
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Arguments <- OPEN Expression (COMMA Expression)* CLOSE
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~COMMA <- ',' Spacing
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# Instruction grammars
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Instruction <-
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BeginBracket (InstructionItem (InstructionItemSeparator InstructionItem)*)? EndBracket
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InstructionItem <- PrecedenceClimbing / ErrorMessage / NoAstOpt
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~InstructionItemSeparator <- ';' Spacing
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~SpacesZom <- Space*
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~SpacesOom <- Space+
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~BeginBracket <- '{' Spacing
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~EndBracket <- '}' Spacing
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# PrecedenceClimbing instruction
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PrecedenceClimbing <- "precedence" SpacesOom PrecedenceInfo (SpacesOom PrecedenceInfo)* SpacesZom
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PrecedenceInfo <- PrecedenceAssoc (~SpacesOom PrecedenceOpe)+
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PrecedenceOpe <-
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['] <(!(Space / [']) Char)*> [']
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/ ["] <(!(Space / ["]) Char)*> ["]
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/ <(!(PrecedenceAssoc / Space / '}') . )+>
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PrecedenceAssoc <- [LR]
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# Error message instruction
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ErrorMessage <- "message" SpacesOom LiteralD SpacesZom
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# No Ast node optimization instruction
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NoAstOpt <- "no_ast_opt" SpacesZom
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