local re = require 'parser.relabel' local m = require 'lpeglabel' local calcline = require 'parser.calcline' local scriptBuf = '' local compiled = {} local parser local RESERVED = { ['and'] = true, ['break'] = true, ['do'] = true, ['else'] = true, ['elseif'] = true, ['end'] = true, ['false'] = true, ['for'] = true, ['function'] = true, ['goto'] = true, ['if'] = true, ['in'] = true, ['local'] = true, ['nil'] = true, ['not'] = true, ['or'] = true, ['repeat'] = true, ['return'] = true, ['then'] = true, ['true'] = true, ['until'] = true, ['while'] = true, } local defs = setmetatable({}, {__index = function (self, key) self[key] = function (...) if parser[key] then return parser[key](...) end end return self[key] end}) defs.nl = (m.P'\r\n' + m.S'\r\n') / function () if parser.nl then return parser.nl() end end defs.s = m.S' \t' defs.S = - defs.s defs.ea = '\a' defs.eb = '\b' defs.ef = '\f' defs.en = '\n' defs.er = '\r' defs.et = '\t' defs.ev = '\v' defs.NotReserved = function (_, _, str) if RESERVED[str] then return false end return true, str end defs.first = function (first, ...) return first end local eof = re.compile '!. / %{SYNTAX_ERROR}' local function grammar(tag) return function (script) scriptBuf = script .. '\r\n' .. scriptBuf compiled[tag] = re.compile(scriptBuf, defs) * eof end end local labels = { } local function errorpos(lua, pos, err) local row, col = calcline.rowcol(lua, pos) local str = calcline.line(lua, row) return { lua = lua, line = row, pos = col, err = err, code = str, level = 'error', } end grammar 'Comment' [[ Comment <- '--' (LongComment / ShortComment) LongComment <- '[' {:eq: '='* :} '[' CommentClose CommentClose <- ']' =eq ']' / . CommentClose ShortComment <- (!%nl .)* ]] grammar 'Sp' [[ Sp <- (Comment / %nl / %s)* ]] grammar 'Common' [[ Cut <- ![a-zA-Z0-9_] X16 <- [a-fA-F0-9] AND <- Sp {'and'} Cut BREAK <- Sp 'break' Cut DO <- Sp 'do' Cut ELSE <- Sp 'else' Cut ELSEIF <- Sp 'elseif' Cut END <- Sp 'end' Cut FALSE <- Sp 'false' Cut FOR <- Sp 'for' Cut FUNCTION <- Sp 'function' Cut GOTO <- Sp 'goto' Cut IF <- Sp 'if' Cut IN <- Sp 'in' Cut LOCAL <- Sp 'local' Cut NIL <- Sp 'nil' Cut NOT <- Sp {'not'} Cut OR <- Sp {'or'} Cut REPEAT <- Sp 'repeat' Cut RETURN <- Sp 'return' Cut THEN <- Sp 'then' Cut TRUE <- Sp 'true' Cut UNTIL <- Sp 'until' Cut WHILE <- Sp 'while' Cut Esc <- '\' -> '' EChar EChar <- 'a' -> ea / 'b' -> eb / 'f' -> ef / 'n' -> en / 'r' -> er / 't' -> et / 'v' -> ev / '\' / '"' / "'" / %nl / ('z' (%nl / %s)*) -> '' / ('x' {X16 X16}) -> Char16 / ([0-9] [0-9]? [0-9]?) -> Char10 / ('u{' {X16^+1^-6} '}')-> CharUtf8 Comp <- Sp {CompList} CompList <- '<=' / '>=' / '<' / '>' / '~=' / '==' BOR <- Sp {'|'} BXOR <- Sp {'~'} BAND <- Sp {'&'} Bshift <- Sp {BshiftList} BshiftList <- '<<' / '>>' Concat <- Sp {'..'} Adds <- Sp {AddsList} AddsList <- '+' / '-' Muls <- Sp {MulsList} MulsList <- '*' / '//' / '/' / '%' Unary <- Sp {UnaryList} UnaryList <- 'not' / '#' / '-' / '~' POWER <- Sp {'^'} PL <- Sp '(' PR <- Sp ')' BL <- Sp '[' BR <- Sp ']' TL <- Sp '{' TR <- Sp '}' COMMA <- Sp ',' SEMICOLON <- Sp ';' DOTS <- Sp ({} '...') -> DOTS DOT <- Sp '.' COLON <- Sp ({} ':') -> COLON LABEL <- Sp '::' ASSIGN <- Sp '=' TOCLOSE <- Sp '*toclose' ]] grammar 'Nil' [[ Nil <- Sp ({} -> Nil) NIL ]] grammar 'Boolean' [[ Boolean <- Sp ({} -> True) TRUE / Sp ({} -> False) FALSE ]] grammar 'String' [[ String <- Sp ({} StringDef {}) -> String StringDef <- '"' {~(Esc / !%nl !'"' .)*~} -> first '"' / "'" {~(Esc / !%nl !"'" .)*~} -> first "'" / '[' {:eq: '='* :} '[' {(!StringClose .)*} -> first StringClose StringClose <- ']' =eq ']' ]] grammar 'Number' [[ Number <- Sp ({} {NumberDef} {}) -> Number NumberDef <- Number16 / Number10 Number10 <- Integer10 Float10 Integer10 <- '0' / [1-9] [0-9]* Float10 <- ('.' [0-9]*)? ([eE] [+-]? [1-9]? [0-9]*)? Number16 <- Integer16 Float16 Integer16 <- '0' [xX] X16* Float16 <- ('.' X16*)? ([pP] [+-]? [1-9]? [0-9]*)? ]] grammar 'Name' [[ Name <- Sp ({} NameBody {}) -> Name NameBody <- ([a-zA-Z_] [a-zA-Z0-9_]*) => NotReserved ]] grammar 'Exp' [[ Exp <- ExpOr ExpOr <- (ExpAnd (OR ExpAnd)*) -> Binary ExpAnd <- (ExpCompare (AND ExpCompare)*) -> Binary ExpCompare <- (ExpBor (Comp ExpBor)*) -> Binary ExpBor <- (ExpBxor (BOR ExpBxor)*) -> Binary ExpBxor <- (ExpBand (BXOR ExpBand)*) -> Binary ExpBand <- (ExpBshift (BAND ExpBshift)*) -> Binary ExpBshift <- (ExpConcat (Bshift ExpConcat)*) -> Binary ExpConcat <- (ExpAdds (Concat ExpConcat)*) -> Binary ExpAdds <- (ExpMuls (Adds ExpMuls)*) -> Binary ExpMuls <- (ExpUnary (Muls ExpUnary)*) -> Binary ExpUnary <- ( (Unary+ ExpPower)) -> Unary / ExpPower ExpPower <- (ExpUnit (POWER ExpUnary)*) -> Binary ExpUnit <- Nil / Boolean / String / Number / DOTS / Table / Function / Simple Simple <- (Prefix (Suffix)*) -> Simple Prefix <- PL Exp PR / Name Suffix <- DOT Name / COLON Name / Table -> Call / String -> Call / BL Exp -> Index BR / PL (ExpList -> Call) PR ExpList <- (Exp (COMMA Exp)*)? -> List NameList <- (Name (COMMA Name)*)? -> List ArgList <- (Arg (COMMA Arg)*)? -> List Arg <- DOTS / Name Table <- Sp ({} TL TableFields TR {}) -> Table TableFields <- (TableField (TableSep TableField)* TableSep?)? -> TableFields TableSep <- COMMA / SEMICOLON TableField <- NewIndex / NewField / Exp NewIndex <- (BL Exp BR ASSIGN Exp) -> NewIndex NewField <- (Name ASSIGN Exp) -> NewField Function <- Sp ({} FunctionBody {}) -> Function FunctionBody<- FUNCTION FuncName PL ArgList PR Action* END FuncName <- (Name? (FuncSuffix)*) -> Simple FuncSuffix <- DOT Name / COLON Name -- 纯占位，修改了 `relabel.lua` 使重复定义不抛错 Action <- !END . ]] grammar 'Action' [[ Action <- SEMICOLON / Do / Break / Return / Label / GoTo / If / For / While / Repeat / Function / LocalFunction / Local / Set / Call SimpleList <- (Simple (COMMA Simple)*) -> List Do <- Sp ({} DO DoBody END {}) -> Do DoBody <- Action* -> DoBody Break <- BREAK -> Break Return <- RETURN ExpList? -> Return Label <- LABEL Name -> Label LABEL GoTo <- GOTO Name -> GoTo If <- Sp ({} IfBody {}) -> If IfBody <- (IfPart -> IfBlock) (ElseIfPart -> ElseIfBlock)* (ElsePart -> ElseBlock)? END IfPart <- IF Exp THEN Action* ElseIfPart <- ELSEIF Exp THEN Action* ElsePart <- ELSE Action* For <- Loop / In Loop <- Sp ({} LoopBody {}) -> Loop LoopBody <- (FOR LoopStart LoopFinish LoopStep? DO) -> LoopDef Action* END LoopStart <- Name ASSIGN Exp LoopFinish <- COMMA Exp LoopStep <- COMMA Exp In <- Sp ({} InBody {}) -> In InBody <- FOR NameList IN ExpList DO Action* END While <- Sp ({} WhileBody {}) -> While WhileBody <- WHILE Exp DO Action* END Repeat <- Sp ({} RepeatBody {}) -> Repeat RepeatBody <- REPEAT Action* UNTIL Exp Local <- (LOCAL TOCLOSE? NameList (ASSIGN ExpList)?) -> Local Set <- (SimpleList ASSIGN ExpList) -> Set Call <- Simple LocalFunction <- Sp ({} LOCAL FunctionBody {}) -> LocalFunction ]] grammar 'Lua' [[ Lua <- (Sp Action)* -> Lua Sp ]] return function (lua, mode, parser_) parser = parser_ or {} mode = mode or 'Lua' local r, e, pos = compiled[mode]:match(lua) if not r then local err = errorpos(lua, pos, e) return nil, err end return r end