// Code generated by goyacc -o calc.go calc.y. DO NOT EDIT. //line calc.y:2 package main import __yyfmt__ "fmt" //line calc.y:2 import ( "math" "math/rand" "time" ) var reg = map[string]float64{ "pi": math.Pi, "e": math.E, } const last = "_" //line calc.y:19 type yySymType struct { yys int fval float64 sval string } const NUMBER = 57346 const WORD = 57347 const UMINUS = 57348 var yyToknames = [...]string{ "$end", "error", "$unk", "NUMBER", "WORD", "'+'", "'-'", "'*'", "'/'", "'%'", "'^'", "UMINUS", "'='", "'_'", "'?'", "'('", "')'", "'|'", } var yyStatenames = [...]string{} const yyEofCode = 1 const yyErrCode = 2 const yyInitialStackSize = 16 //line calc.y:62 func init() { rand.Seed(time.Now().UnixNano()) } func Parse(input string) (float64, error) { l := lex(input) yyParse(l) return l.result, l.err } //line yacctab:1 var yyExca = [...]int{ -1, 0, 1, 1, -2, 0, -1, 1, 1, -1, -2, 0, } const yyPrivate = 57344 const yyLast = 58 var yyAct = [...]int{ 2, 11, 12, 13, 14, 15, 16, 17, 16, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 4, 1, 5, 3, 0, 8, 11, 12, 13, 14, 15, 16, 6, 7, 9, 0, 10, 0, 30, 5, 19, 0, 8, 11, 12, 13, 14, 15, 16, 6, 7, 9, 0, 10, 29, 13, 14, 15, 16, } var yyPact = [...]int{ 17, -1000, -5, -6, -1000, -1000, -1000, -1000, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, -1000, -1000, 36, 19, 46, 46, -3, -3, -3, -1000, -5, -1000, -1000, } var yyPgo = [...]int{ 0, 0, 20, } var yyR1 = [...]int{ 0, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, } var yyR2 = [...]int{ 0, 0, 1, 3, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 2, 3, 3, } var yyChk = [...]int{ -1000, -2, -1, 5, 2, 4, 14, 15, 7, 16, 18, 6, 7, 8, 9, 10, 11, 13, -1, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, 17, 18, } var yyDef = [...]int{ -2, -2, 2, 6, 4, 5, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 15, 6, 0, 0, 9, 10, 11, 12, 13, 14, 3, 16, 17, } var yyTok1 = [...]int{ 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 10, 3, 3, 16, 17, 8, 6, 3, 7, 3, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 13, 3, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 18, } var yyTok2 = [...]int{ 2, 3, 4, 5, 12, } var yyTok3 = [...]int{ 0, } var yyErrorMessages = [...]struct { state int token int msg string }{} //line yaccpar:1 /* parser for yacc output */ var ( yyDebug = 0 yyErrorVerbose = false ) type yyLexer interface { Lex(lval *yySymType) int Error(s string) } type yyParser interface { Parse(yyLexer) int Lookahead() int } type yyParserImpl struct { lval yySymType stack [yyInitialStackSize]yySymType char int } func (p *yyParserImpl) Lookahead() int { return p.char } func yyNewParser() yyParser { return &yyParserImpl{} } const yyFlag = -1000 func yyTokname(c int) string { if c >= 1 && c-1 < len(yyToknames) { if yyToknames[c-1] != "" { return yyToknames[c-1] } } return __yyfmt__.Sprintf("tok-%v", c) } func yyStatname(s int) string { if s >= 0 && s < len(yyStatenames) { if yyStatenames[s] != "" { return yyStatenames[s] } } return __yyfmt__.Sprintf("state-%v", s) } func yyErrorMessage(state, lookAhead int) string { const TOKSTART = 4 if !yyErrorVerbose { return "syntax error" } for _, e := range yyErrorMessages { if e.state == state && e.token == lookAhead { return "syntax error: " + e.msg } } res := "syntax error: unexpected " + yyTokname(lookAhead) // To match Bison, suggest at most four expected tokens. expected := make([]int, 0, 4) // Look for shiftable tokens. base := yyPact[state] for tok := TOKSTART; tok-1 < len(yyToknames); tok++ { if n := base + tok; n >= 0 && n < yyLast && yyChk[yyAct[n]] == tok { if len(expected) == cap(expected) { return res } expected = append(expected, tok) } } if yyDef[state] == -2 { i := 0 for yyExca[i] != -1 || yyExca[i+1] != state { i += 2 } // Look for tokens that we accept or reduce. for i += 2; yyExca[i] >= 0; i += 2 { tok := yyExca[i] if tok < TOKSTART || yyExca[i+1] == 0 { continue } if len(expected) == cap(expected) { return res } expected = append(expected, tok) } // If the default action is to accept or reduce, give up. if yyExca[i+1] != 0 { return res } } for i, tok := range expected { if i == 0 { res += ", expecting " } else { res += " or " } res += yyTokname(tok) } return res } func yylex1(lex yyLexer, lval *yySymType) (char, token int) { token = 0 char = lex.Lex(lval) if char <= 0 { token = yyTok1[0] goto out } if char < len(yyTok1) { token = yyTok1[char] goto out } if char >= yyPrivate { if char < yyPrivate+len(yyTok2) { token = yyTok2[char-yyPrivate] goto out } } for i := 0; i < len(yyTok3); i += 2 { token = yyTok3[i+0] if token == char { token = yyTok3[i+1] goto out } } out: if token == 0 { token = yyTok2[1] /* unknown char */ } if yyDebug >= 3 { __yyfmt__.Printf("lex %s(%d)\n", yyTokname(token), uint(char)) } return char, token } func yyParse(yylex yyLexer) int { return yyNewParser().Parse(yylex) } func (yyrcvr *yyParserImpl) Parse(yylex yyLexer) int { var yyn int var yyVAL yySymType var yyDollar []yySymType _ = yyDollar // silence set and not used yyS := yyrcvr.stack[:] Nerrs := 0 /* number of errors */ Errflag := 0 /* error recovery flag */ yystate := 0 yyrcvr.char = -1 yytoken := -1 // yyrcvr.char translated into internal numbering defer func() { // Make sure we report no lookahead when not parsing. yystate = -1 yyrcvr.char = -1 yytoken = -1 }() yyp := -1 goto yystack ret0: return 0 ret1: return 1 yystack: /* put a state and value onto the stack */ if yyDebug >= 4 { __yyfmt__.Printf("char %v in %v\n", yyTokname(yytoken), yyStatname(yystate)) } yyp++ if yyp >= len(yyS) { nyys := make([]yySymType, len(yyS)*2) copy(nyys, yyS) yyS = nyys } yyS[yyp] = yyVAL yyS[yyp].yys = yystate yynewstate: yyn = yyPact[yystate] if yyn <= yyFlag { goto yydefault /* simple state */ } if yyrcvr.char < 0 { yyrcvr.char, yytoken = yylex1(yylex, &yyrcvr.lval) } yyn += yytoken if yyn < 0 || yyn >= yyLast { goto yydefault } yyn = yyAct[yyn] if yyChk[yyn] == yytoken { /* valid shift */ yyrcvr.char = -1 yytoken = -1 yyVAL = yyrcvr.lval yystate = yyn if Errflag > 0 { Errflag-- } goto yystack } yydefault: /* default state action */ yyn = yyDef[yystate] if yyn == -2 { if yyrcvr.char < 0 { yyrcvr.char, yytoken = yylex1(yylex, &yyrcvr.lval) } /* look through exception table */ xi := 0 for { if yyExca[xi+0] == -1 && yyExca[xi+1] == yystate { break } xi += 2 } for xi += 2; ; xi += 2 { yyn = yyExca[xi+0] if yyn < 0 || yyn == yytoken { break } } yyn = yyExca[xi+1] if yyn < 0 { goto ret0 } } if yyn == 0 { /* error ... attempt to resume parsing */ switch Errflag { case 0: /* brand new error */ yylex.Error(yyErrorMessage(yystate, yytoken)) Nerrs++ if yyDebug >= 1 { __yyfmt__.Printf("%s", yyStatname(yystate)) __yyfmt__.Printf(" saw %s\n", yyTokname(yytoken)) } fallthrough case 1, 2: /* incompletely recovered error ... try again */ Errflag = 3 /* find a state where "error" is a legal shift action */ for yyp >= 0 { yyn = yyPact[yyS[yyp].yys] + yyErrCode if yyn >= 0 && yyn < yyLast { yystate = yyAct[yyn] /* simulate a shift of "error" */ if yyChk[yystate] == yyErrCode { goto yystack } } /* the current p has no shift on "error", pop stack */ if yyDebug >= 2 { __yyfmt__.Printf("error recovery pops state %d\n", yyS[yyp].yys) } yyp-- } /* there is no state on the stack with an error shift ... abort */ goto ret1 case 3: /* no shift yet; clobber input char */ if yyDebug >= 2 { __yyfmt__.Printf("error recovery discards %s\n", yyTokname(yytoken)) } if yytoken == yyEofCode { goto ret1 } yyrcvr.char = -1 yytoken = -1 goto yynewstate /* try again in the same state */ } } /* reduction by production yyn */ if yyDebug >= 2 { __yyfmt__.Printf("reduce %v in:\n\t%v\n", yyn, yyStatname(yystate)) } yynt := yyn yypt := yyp _ = yypt // guard against "declared and not used" yyp -= yyR2[yyn] // yyp is now the index of $0. Perform the default action. Iff the // reduced production is ε, $1 is possibly out of range. if yyp+1 >= len(yyS) { nyys := make([]yySymType, len(yyS)*2) copy(nyys, yyS) yyS = nyys } yyVAL = yyS[yyp+1] /* consult goto table to find next state */ yyn = yyR1[yyn] yyg := yyPgo[yyn] yyj := yyg + yyS[yyp].yys + 1 if yyj >= yyLast { yystate = yyAct[yyg] } else { yystate = yyAct[yyj] if yyChk[yystate] != -yyn { yystate = yyAct[yyg] } } // dummy call; replaced with literal code switch yynt { case 2: yyDollar = yyS[yypt-1 : yypt+1] //line calc.y:38 { reg[last] = yyDollar[1].fval yylex.(*yyLex).result = yyDollar[1].fval } case 3: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:42 { reg[yyDollar[1].sval] = yyDollar[3].fval } case 6: yyDollar = yyS[yypt-1 : yypt+1] //line calc.y:48 { yyVAL.fval = reg[yyDollar[1].sval] } case 7: yyDollar = yyS[yypt-1 : yypt+1] //line calc.y:49 { yyVAL.fval = reg[last] } case 8: yyDollar = yyS[yypt-1 : yypt+1] //line calc.y:50 { yyVAL.fval = rand.Float64() } case 9: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:51 { yyVAL.fval = yyDollar[1].fval + yyDollar[3].fval } case 10: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:52 { yyVAL.fval = yyDollar[1].fval - yyDollar[3].fval } case 11: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:53 { yyVAL.fval = yyDollar[1].fval * yyDollar[3].fval } case 12: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:54 { yyVAL.fval = yyDollar[1].fval / yyDollar[3].fval } case 13: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:55 { yyVAL.fval = math.Mod(yyDollar[1].fval, yyDollar[3].fval) } case 14: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:56 { yyVAL.fval = math.Pow(yyDollar[1].fval, yyDollar[3].fval) } case 15: yyDollar = yyS[yypt-2 : yypt+1] //line calc.y:57 { yyVAL.fval = -yyDollar[2].fval } case 16: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:58 { yyVAL.fval = yyDollar[2].fval } case 17: yyDollar = yyS[yypt-3 : yypt+1] //line calc.y:59 { yyVAL.fval = math.Abs(yyDollar[2].fval) } } goto yystack /* stack new state and value */ }