refactor(license): use goyacc for license parser (#3824)

pkg/licensing/expression/parser_gen.go

@@ -0,0 +1,507 @@
+// Code generated by goyacc -o parser_gen.go parser.go.y. DO NOT EDIT.
+
+//line parser.go.y:2
+package expression
+
+import __yyfmt__ "fmt"
+
+//line parser.go.y:2
+
+//line parser.go.y:5
+type yySymType struct {
+	yys   int
+	token Token
+	expr  Expression
+}
+
+const IDENT = 57346
+const OR = 57347
+const AND = 57348
+const WITH = 57349
+
+var yyToknames = [...]string{
+	"$end",
+	"error",
+	"$unk",
+	"IDENT",
+	"OR",
+	"AND",
+	"WITH",
+	"'+'",
+	"'('",
+	"')'",
+}
+
+var yyStatenames = [...]string{}
+
+const yyEofCode = 1
+const yyErrCode = 2
+const yyInitialStackSize = 16
+
+//line parser.go.y:73
+
+//line yacctab:1
+var yyExca = [...]int8{
+	-1, 1,
+	1, -1,
+	-2, 0,
+}
+
+const yyPrivate = 57344
+
+const yyLast = 22
+
+var yyAct = [...]int8{
+	8, 7, 9, 2, 10, 16, 9, 4, 11, 12,
+	6, 13, 14, 15, 3, 5, 8, 7, 9, 7,
+	9, 1,
+}
+
+var yyPact = [...]int16{
+	6, -1000, 11, 0, -1000, 6, -1000, 6, 6, 6,
+	-1000, -1000, -5, -1, 13, -1, -1000,
+}
+
+var yyPgo = [...]int8{
+	0, 21, 14, 7, 3,
+}
+
+var yyR1 = [...]int8{
+	0, 1, 2, 2, 3, 4, 4, 4, 4, 4,
+	4,
+}
+
+var yyR2 = [...]int8{
+	0, 1, 1, 2, 2, 1, 1, 3, 3, 3,
+	3,
+}
+
+var yyChk = [...]int16{
+	-1000, -1, -4, -2, -3, 9, 4, 6, 5, 7,
+	4, 8, -4, -4, -4, -4, 10,
+}
+
+var yyDef = [...]int8{
+	0, -2, 1, 5, 6, 0, 2, 0, 0, 0,
+	3, 4, 0, 7, 8, 9, 10,
+}
+
+var yyTok1 = [...]int8{
+	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, 3, 3, 3,
+	9, 10, 3, 8,
+}
+
+var yyTok2 = [...]int8{
+	2, 3, 4, 5, 6, 7,
+}
+
+var yyTok3 = [...]int8{
+	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 := int(yyPact[state])
+	for tok := TOKSTART; tok-1 < len(yyToknames); tok++ {
+		if n := base + tok; n >= 0 && n < yyLast && int(yyChk[int(yyAct[n])]) == tok {
+			if len(expected) == cap(expected) {
+				return res
+			}
+			expected = append(expected, tok)
+		}
+	}
+
+	if yyDef[state] == -2 {
+		i := 0
+		for yyExca[i] != -1 || int(yyExca[i+1]) != state {
+			i += 2
+		}
+
+		// Look for tokens that we accept or reduce.
+		for i += 2; yyExca[i] >= 0; i += 2 {
+			tok := int(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 = int(yyTok1[0])
+		goto out
+	}
+	if char < len(yyTok1) {
+		token = int(yyTok1[char])
+		goto out
+	}
+	if char >= yyPrivate {
+		if char < yyPrivate+len(yyTok2) {
+			token = int(yyTok2[char-yyPrivate])
+			goto out
+		}
+	}
+	for i := 0; i < len(yyTok3); i += 2 {
+		token = int(yyTok3[i+0])
+		if token == char {
+			token = int(yyTok3[i+1])
+			goto out
+		}
+	}
+
+out:
+	if token == 0 {
+		token = int(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 = int(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 = int(yyAct[yyn])
+	if int(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 = int(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 && int(yyExca[xi+1]) == yystate {
+				break
+			}
+			xi += 2
+		}
+		for xi += 2; ; xi += 2 {
+			yyn = int(yyExca[xi+0])
+			if yyn < 0 || yyn == yytoken {
+				break
+			}
+		}
+		yyn = int(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 = int(yyPact[yyS[yyp].yys]) + yyErrCode
+				if yyn >= 0 && yyn < yyLast {
+					yystate = int(yyAct[yyn]) /* simulate a shift of "error" */
+					if int(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 -= int(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 = int(yyR1[yyn])
+	yyg := int(yyPgo[yyn])
+	yyj := yyg + yyS[yyp].yys + 1
+
+	if yyj >= yyLast {
+		yystate = int(yyAct[yyg])
+	} else {
+		yystate = int(yyAct[yyj])
+		if int(yyChk[yystate]) != -yyn {
+			yystate = int(yyAct[yyg])
+		}
+	}
+	// dummy call; replaced with literal code
+	switch yynt {
+
+	case 1:
+		yyDollar = yyS[yypt-1 : yypt+1]
+//line parser.go.y:25
+		{
+			yyVAL.expr = yyDollar[1].expr
+			if l, ok := yylex.(*Lexer); ok {
+				l.result = yyVAL.expr
+			}
+		}
+	case 2:
+		yyDollar = yyS[yypt-1 : yypt+1]
+//line parser.go.y:34
+		{
+			yyVAL.expr = SimpleExpr{license: yyDollar[1].token.literal}
+		}
+	case 3:
+		yyDollar = yyS[yypt-2 : yypt+1]
+//line parser.go.y:38
+		{
+			yyVAL.expr = SimpleExpr{license: yyDollar[1].expr.String() + " " + yyDollar[2].token.literal}
+		}
+	case 4:
+		yyDollar = yyS[yypt-2 : yypt+1]
+//line parser.go.y:44
+		{
+			yyVAL.expr = SimpleExpr{license: yyDollar[1].expr.String(), hasPlus: true}
+		}
+	case 5:
+		yyDollar = yyS[yypt-1 : yypt+1]
+//line parser.go.y:49
+		{
+			yyVAL.expr = yyDollar[1].expr
+		}
+	case 6:
+		yyDollar = yyS[yypt-1 : yypt+1]
+//line parser.go.y:52
+		{
+			yyVAL.expr = yyDollar[1].expr
+		}
+	case 7:
+		yyDollar = yyS[yypt-3 : yypt+1]
+//line parser.go.y:56
+		{
+			yyVAL.expr = CompoundExpr{left: yyDollar[1].expr, conjunction: yyDollar[2].token, right: yyDollar[3].expr}
+		}
+	case 8:
+		yyDollar = yyS[yypt-3 : yypt+1]
+//line parser.go.y:60
+		{
+			yyVAL.expr = CompoundExpr{left: yyDollar[1].expr, conjunction: yyDollar[2].token, right: yyDollar[3].expr}
+		}
+	case 9:
+		yyDollar = yyS[yypt-3 : yypt+1]
+//line parser.go.y:64
+		{
+			yyVAL.expr = CompoundExpr{left: yyDollar[1].expr, conjunction: yyDollar[2].token, right: yyDollar[3].expr}
+		}
+	case 10:
+		yyDollar = yyS[yypt-3 : yypt+1]
+//line parser.go.y:68
+		{
+			yyVAL.expr = yyDollar[2].expr
+		}
+	}
+	goto yystack /* stack new state and value */
+}