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view modules/parser.tp @ 220:a1a80af71b05
Implement onePlus macro. Fix some bugs in the other matching macros. Implement integer literal parsing rules.
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 23 Dec 2013 14:44:31 -0800 |
parents | b799192e404b |
children | c6e321a538d4 |
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#{ _applyMatch <- :fun tomatch { fun: tomatch } _matchString <- :str tomatch { if: (tomatch isString?) { if: (tomatch length) < (str length) { #{ matched? <- { false } } } else: { if: (tomatch length) > (str length) { tomatch <- tomatch from: 0 withLength: (str length) } if: str = tomatch { #{ matched? <- { true } matchlen <- { str length } basicYield? <- { true } yield <- { str } } } else: { #{ matched? <- { false } } } } } else: { #{ matched? <- { false } } } } ifmatch:else <- :matchres :elseblock { if: (matchres matched?) { matchres } else: { elseblock: } } _makeMatchCall <- :matchexpr { if: (matchexpr nodeType) = "lambda" { #{ valid? <- { true } matchcall <- quote: (_applyMatch: matchexpr tomatch) } } else: { if: (matchexpr nodeType) = "symbol" { #{ valid? <- { true } matchcall <- quote: (matchexpr: tomatch) } } else: { if: (matchexpr nodeType) = "strlit" { #{ valid? <- { true } matchcall <- quote: (_matchString: matchexpr tomatch) } } else: { if: (matchexpr nodeType) = "op" { if: (matchexpr opName) = "." { left <- (_makeMatchCall: (matchexpr left)) matchcall right <- (_makeMatchCall: (matchexpr right)) matchcall #{ valid? <- { true } matchcall <- quote: (_applyMatch: :tomatch { lm <- left if: (lm matched?) { orig <- tomatch tomatch <- tomatch from: (lm matchlen) rm <- right if: (rm matched?) { total <- (rm matchlen) + (lm matchlen) #{ matched? <- { true } matchlen <- { total } basicYield? <- { true } yield <- { orig from: 0 withLength: total } } } else: { rm } } else: { lm } } tomatch) } } else: { #{ valid? <- { false } message <- "Unsupported operator " . (matchexpr opName) } } } else: { #{ valid? <- { false } message <- "Unsupported AST node type " . (matchexpr nodeType) } } } } } } expandClass <- :chars { if: (chars length) > 0 { pos <- 0 inverted <- false if: (chars byte: 0) = ("^" byte: 0) { pos <- 1 inverted <- true } state_begin <- 0 state_normal <- 1 state_rangeend <- 2 state <- state_begin out <- "" while: { pos < (chars byte_length)} do: { if: state = state_begin { out <- out . (chars from: pos withLength: 1) state <- state_normal } else: { if: state = state_normal { if: (chars byte: pos) = ("-" byte: 0) { state <- state_rangeend } else: { out <- out . (chars from: pos withLength: 1) } } else: { rangestart <- out byte: ((out byte_length) - 1) rangeend <- chars byte: pos if: rangeend < rangestart { tmp <- rangeend rangeend <- rangestart rangestart <- tmp } out <- out from: 0 withLength: ((out length) - 1) while: { rangestart <= rangeend } do: { out <- out . (rangestart asStringChar) rangestart <- rangestart + 1 } state <- state_begin } } pos <- pos + 1 } if: inverted { old <- out out <- "" //skip control characters for now cur <- 32 while: { cur < 256 } do: { notfound <- true idx <- 0 len <- (old length) while: { notfound && idx < len } do: { if: cur = (old byte: idx) { notfound <- false } else: { idx <- idx + 1 } } if: notfound { out <- out . (cur asStringChar) } cur <- cur + 1 } } out } else: { "" } } charClass <- macro: :rawchars { eval: rawchars :chars { orig <- chars chars <- expandClass: chars //TODO: Use a more sophisticated approach for large classes quote: :tomatch { if: (tomatch isString?) { check <- 0 nomatch <- true while: { nomatch && check < (chars byte_length) } do: { if: (tomatch byte: 0) = (chars byte: check) { nomatch <- false } check <- check + 1 } if: nomatch { #{ matched? <- { false } } } else: { #{ matched? <- { true } matchlen <- { 1 } basicYield? <- { true } yield <- { tomatch from: 0 withLength: 1 } } } } else: { #{ matched? <- { false } } } } } else: { print: "#error Argument to charClass macro must be a compile-time constant\n" } } _nPlus <- :matchexpr min { funexpr <- false valid <- false mc <- _makeMatchCall: matchexpr if: (mc valid?) { mcall <- mc matchcall quote: :tomatch { cur <- 0 count <- 0 n <- tomatch byte_length orig <- tomatch match <- true allBasic? <- true yieldvals <- [] while: { match && cur < n } do: { res <- mcall match <- res matched? if: match { count <- count + 1 //TODO: Use some kind of lightweight substring wrapper here tomatch <- tomatch from: (res matchlen) if: allBasic? { ifnot: (res basicYield?) { allBasic? <- false if: cur > 0 { yieldvals <- (orig from: 0 withLength: cur) | yieldvals } yieldvals <- (res yield) | yieldvals } } else: { yieldvals <- (res yield) | yieldvals } allBasic? <- allBasic? && (res basicYield?) cur <- cur + (res matchlen) } } if: count >= min { if: allBasic? { #{ matched? <- { true } matchlen <- { cur } basicYield? <- { true } yield <- { orig from: 0 withLength: cur } } } else: { yieldvals <- yieldvals reverse #{ matched? <- { true } matchlen <- { cur } basicYield? <- { false } yield <- { yieldvals } } } } else: { #{ matched? <- { false } } } } } else: { print: "#error Invalid nPlus macro call: " . (mc message) . "\n" } } zeroPlus <- macro: :matchexpr { _nPlus: matchexpr 0 } onePlus <- macro: :matchexpr { _nPlus: matchexpr 1 } matchOne <- macro: :options { options <- (options value) map: :option { _makeMatchCall: option } body <- options foldr: (quote: #{ matched? <- { false } }) with: :acc el { if: (el valid?) { mcall <- el matchcall quote: (ifmatch: mcall else: { acc }) } else: { print: "#error Invalid matchOne macro call: " . (el message) . "\n" acc } } quote: :tomatch { body } } match:yield <- macro: :matchexpr :ylambda { mc <- _makeMatchCall: matchexpr if: (mc valid?) { mcall <- mc matchcall quote: :tomatch { res <- mcall if: (res matched?) { #{ matched? <- { true } matchlen <- { res matchlen } basicYield? <- { false } yield <- ylambda } } else: { res } } } else: { print: "#error Invalid macth:yield macro call: " . (mc message) . "\n" } } match:where:yield <- macro: :matchexpr :whereclause :ylambda { syms <- [] withwhere <- (whereclause expressions) fold: (quote: :tomatch {}) with: :acc el { if: (el nodeType) = "assignment" { valassign <- quote: (val <- false) valsym <- (valassign) symbol valsym <- valsym name!: (valsym name) . ((el symbol) name) valassign <- valassign symbol!: valsym acc addExpression: valassign matchassign <- quote: (hasmatch <- false) matchsym <- (matchassign) symbol matchsym <- matchsym name!: (matchsym name) . ((el symbol) name) matchassign <- matchassign symbol!: matchsym acc addExpression: matchassign mc <- _makeMatchCall: (el expression) if: (mc valid?) { mcall <- mc matchcall matchfun <- quote: :tomatch { if: matchsym { if: valsym = tomatch { #{ matched? <- { true } matchlen <- { valsym length } basicYield? <- { true } //TODO: Check if this is correct yield <- { valsym } } } else: { #{ matched? <- { false } } } } else: { mr <- mcall if: (mr matched?) { matchsym <- true valsym <- (mr yield) } mr } } acc <- acc addExpression: (el expression!: matchfun) syms <- list node: #{ orig <- el symbol matchval <- valsym } withTail: syms acc } else: { print: "#error " . ((el symbol) name) . " does not have a valid match expression: " . (mc message) . "\n" } } else: { print: "#error Nodes of type " . (el nodeType) . " are not allowed in match where clauses\n" acc } } mcMain <- _makeMatchCall: matchexpr if: (mcMain valid?) { mcall <- mcMain matchcall withwhere addExpression: (quote: (matchres <- mcall)) successLambda <- quote: { //Extra assignments will be added here mlen <- matchres matchlen #{ matched? <- { true } matchlen <- { mlen } basicYield? <- { false } yield <- ylambda } } sucexp <- syms fold: (successLambda expressions) with: :acc el { lsym <- el orig rsym <- el matchval (quote: (lsym <- rsym)) | acc } successLambda <- successLambda expressions!: sucexp withwhere addExpression: (quote: (if: (matchres matched?) successLambda else: { matchres })) withwhere } else: { print: "#error Error in main match expression of match:where:yield: " . (mcMain message) . "\n" } } _alpha <- charClass: "a-zA-Z" alpha <- zeroPlus: _alpha alphaNum <- zeroPlus: (charClass: "a-zA-Z0-9") blockComment <- match: "/*" . (zeroPlus: (matchOne: [(charClass: "^*") "*" . (charClass: "^/")])) . "*/" yield: { false } hws <- zeroPlus: (matchOne: [ (charClass: " \t") blockComment ]) ws <- zeroPlus: (matchOne: [ (charClass: " \n\t\r") "//" . (zeroPlus: (charClass: "^\n")) . "\n" blockComment ]) escape <- matchOne: [ (match: "\\n" yield: {"\n"}) (match: "\\r" yield: {"\n"}) (match: "\\t" yield: {"\n"}) (match: "\\\\" yield: {"\\"}) (match: "\\\"" yield: {"\""}) ] string <- match: "\"" . Chars . "\"" where: { Chars <- zeroPlus: (matchOne: [ (charClass: "^\"\\") escape ]) } yield: { Chars join: "" } bdigit <- matchOne: [ (match: "0" yield: {0i64}) (match: "1" yield: {1i64}) ] digit <- matchOne: [ bdigit (match: "2" yield: {2i64}) (match: "3" yield: {3i64}) (match: "4" yield: {4i64}) (match: "5" yield: {5i64}) (match: "6" yield: {6i64}) (match: "7" yield: {7i64}) (match: "8" yield: {8i64}) (match: "9" yield: {9i64}) ] hdigit <- matchOne: [ digit (match: (charClass: "aA") yield: {10i64}) (match: (charClass: "bB") yield: {11i64}) (match: (charClass: "cC") yield: {12i64}) (match: (charClass: "dD") yield: {13i64}) (match: (charClass: "eE") yield: {14i64}) (match: (charClass: "fF") yield: {15i64}) ] binary <- match: "0b" . Digits . Suffix where: { Digits <- onePlus: bdigit Suffix <- matchOne: [ (charClass: "ui") . (matchOne: ["8" "16" "32" "64"]) "" ] } yield: { num <- Digits fold: 0 with: :acc el { acc * 2i64 + el } signed <- true litbits <- 32 if: (Suffix length) > 0 { if: (Suffix from: 0 withLength: 1) = "u" { signed <- false } litbits <- (Suffix from: 1) int32 } #{ litval <- num signed? <- signed bits <- litbits } } decimal <- match: Sign . Digits . Suffix where: { Sign <- matchOne: ["-" ""] Digits <- onePlus: digit Suffix <- matchOne: [ (charClass: "ui") . (matchOne: ["8" "16" "32" "64"]) "" ] } yield: { num <- Digits fold: 0 with: :acc el { acc * 10i64 + el } if: Sign = "-" { num <- 0i64 - num } signed <- true litbits <- 32 if: (Suffix length) > 0 { if: (Suffix from: 0 withLength: 1) = "u" { signed <- false } print: (Suffix from: 1) . "\n" litbits <- (Suffix from: 1) int32 } #{ litval <- num signed? <- signed bits <- litbits } } hex <- match: "0x" . Digits . Suffix where: { Digits <- onePlus: hdigit Suffix <- matchOne: [ (charClass: "ui") . (matchOne: ["8" "16" "32" "64"]) "" ] } yield: { num <- Digits fold: 0 with: :acc el { acc * 16i64 + el } signed <- true litbits <- 32 if: (Suffix length) > 0 { if: (Suffix from: 0 withLength: 1) = "u" { signed <- false } litbits <- (Suffix from: 1) int32 } #{ litval <- num signed? <- signed bits <- litbits } } testmatchintlit <- :val matchfun { res <- matchfun: val if: (res matched?) { y <- res yield print: val . " matched with litval " . (y litval) . ", bits " . (y bits) . " and singned? " . (y signed?) . "\n" } else: { print: val . " did not match\n" } } main <- { cmatch <- alpha: "czx0123" zeromatch <- alpha: "01234" if: (cmatch matched?) { print: "czx0123 matched with length " . (cmatch matchlen) . "\n" } else: { print: "czx0123 didn't match\n" } if: (zeromatch matched?) { print: "0123 matched with length " . (zeromatch matchlen) . "\n" } else: { print: "0123 didn't match\n" } zeromatchanum <- alphaNum: "01234" if: (zeromatchanum matched?) { print: "01234 matched with length " . (zeromatchanum matchlen) . "\n" } else: { print: "01234 didn't match\n" } stuff <- " \t/* blah blah blah * blah */ foo" hwsmatch <- hws: stuff if: (hwsmatch matched?) { print: "'" . (stuff from: (hwsmatch matchlen)) . "' found after hws\n" } else: { print: stuff . " did not match hws rule\n" } tmatch <- digit: "3" if: (tmatch matched?) { print: "3 matched with yield " . (tmatch yield) . ", yield + 1 = " . ((tmatch yield) + 1) . "\n" } else: { print: "3 did not match\n" } testmatchintlit: "345" :s {decimal: s} testmatchintlit: "-567" :s {decimal: s} testmatchintlit: "123u16" :s {decimal: s} testmatchintlit: "0x20" :s {hex: s} testmatchintlit: "0x42u64" :s {hex: s} testmatchintlit: "0b10101" :s {binary: s} } }