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liquid/expression/y.go

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//line expressions.y:2
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package expression
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import __yyfmt__ "fmt"
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//line expressions.y:2
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import (
"fmt"
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"github.com/osteele/liquid/evaluator"
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)
func init() {
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// This allows adding and removing references to fmt in the rules below,
// without having to edit the import statement to avoid erorrs each time.
_ = fmt.Sprint("")
}
//line expressions.y:15
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type yySymType struct {
yys int
name string
val interface{}
f func(Context) interface{}
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loopmods loopModifiers
filter_params []valueFn
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}
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const LITERAL = 57346
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const IDENTIFIER = 57347
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const KEYWORD = 57348
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const ASSIGN = 57349
const LOOP = 57350
const EQ = 57351
const NEQ = 57352
const GE = 57353
const LE = 57354
const FOR = 57355
const IN = 57356
const AND = 57357
const OR = 57358
const CONTAINS = 57359
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var yyToknames = [...]string{
"$end",
"error",
"$unk",
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"LITERAL",
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"IDENTIFIER",
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"KEYWORD",
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"ASSIGN",
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"LOOP",
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"EQ",
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"NEQ",
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"GE",
"LE",
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"FOR",
"IN",
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"AND",
"OR",
"CONTAINS",
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"'.'",
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"'|'",
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"'<'",
"'>'",
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"';'",
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"'='",
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"'['",
"']'",
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"'('",
"')'",
"','",
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}
var yyStatenames = [...]string{}
const yyEofCode = 1
const yyErrCode = 2
const yyInitialStackSize = 16
//line yacctab:1
var yyExca = [...]int{
-1, 1,
1, -1,
-2, 0,
}
const yyPrivate = 57344
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const yyLast = 69
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var yyAct = [...]int{
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7, 12, 13, 52, 6, 30, 8, 9, 18, 3,
4, 8, 9, 43, 19, 49, 17, 17, 31, 50,
35, 36, 37, 38, 39, 40, 41, 42, 10, 32,
33, 45, 45, 10, 48, 44, 46, 20, 21, 24,
25, 18, 54, 55, 2, 26, 18, 19, 23, 22,
12, 13, 19, 56, 5, 27, 34, 11, 16, 53,
14, 57, 1, 51, 47, 15, 0, 28, 29,
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}
var yyPact = [...]int{
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2, -1000, 35, 55, 53, -1000, -2, 28, -1000, -1000,
7, -1000, 7, 7, -18, -1000, 4, 24, 51, 7,
7, 7, 7, 7, 7, 7, 7, -14, -1000, -1000,
7, 7, -1000, 7, -1000, -10, 23, 23, 23, 23,
23, 23, 23, -1000, -3, 23, -2, -25, 23, -1000,
-1000, 37, 7, -1000, -1000, 57, 23, -1000,
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}
var yyPgo = [...]int{
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0, 0, 54, 4, 44, 65, 64, 63, 62,
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}
var yyR1 = [...]int{
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0, 8, 8, 8, 5, 7, 7, 7, 1, 1,
1, 1, 1, 3, 3, 3, 6, 6, 2, 2,
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2, 2, 2, 2, 2, 2, 4, 4, 4,
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}
var yyR2 = [...]int{
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0, 2, 5, 2, 5, 0, 2, 3, 1, 1,
3, 4, 3, 1, 3, 4, 1, 3, 1, 3,
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3, 3, 3, 3, 3, 3, 1, 3, 3,
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}
var yyChk = [...]int{
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-1000, -8, -4, 7, 8, -2, -3, -1, 4, 5,
26, 22, 15, 16, 5, -5, 5, 19, 18, 24,
9, 10, 21, 20, 11, 12, 17, -4, -2, -2,
23, 14, 5, 6, 5, -1, -1, -1, -1, -1,
-1, -1, -1, 27, -3, -1, -3, -6, -1, 25,
22, -7, 28, 22, 5, 6, -1, 4,
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}
var yyDef = [...]int{
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0, -2, 0, 0, 0, 26, 18, 13, 8, 9,
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0, 1, 0, 0, 0, 3, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 27, 28,
0, 0, 14, 0, 10, 0, 19, 20, 21, 22,
23, 24, 25, 12, 0, 13, 5, 15, 16, 11,
2, 0, 0, 4, 6, 0, 17, 7,
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}
var yyTok1 = [...]int{
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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,
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26, 27, 3, 3, 28, 3, 18, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 22,
20, 23, 21, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 24, 3, 25, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 19,
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}
var yyTok2 = [...]int{
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2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16, 17,
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}
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 1:
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yyDollar = yyS[yypt-2 : yypt+1]
//line expressions.y:33
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{
yylex.(*lexer).val = yyDollar[1].f
}
case 2:
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yyDollar = yyS[yypt-5 : yypt+1]
//line expressions.y:34
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{
name, expr := yyDollar[2].name, yyDollar[4].f
yylex.(*lexer).val = func(ctx Context) interface{} {
ctx.Set(name, expr(ctx))
return nil
}
}
case 3:
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yyDollar = yyS[yypt-2 : yypt+1]
//line expressions.y:41
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{
yylex.(*lexer).val = yyDollar[2].f
}
case 4:
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yyDollar = yyS[yypt-5 : yypt+1]
//line expressions.y:44
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{
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name, expr, mods := yyDollar[1].name, yyDollar[3].f, yyDollar[4].loopmods
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yyVAL.f = func(ctx Context) interface{} {
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return &Loop{name, expr(ctx), mods}
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}
}
case 5:
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yyDollar = yyS[yypt-0 : yypt+1]
//line expressions.y:52
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{
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yyVAL.loopmods = loopModifiers{}
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}
case 6:
yyDollar = yyS[yypt-2 : yypt+1]
//line expressions.y:53
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{
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switch yyDollar[2].name {
case "reversed":
yyDollar[1].loopmods.Reversed = true
default:
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panic(ParseError(fmt.Sprintf("undefined loop modifier: %s", yyDollar[2].name)))
}
yyVAL.loopmods = yyDollar[1].loopmods
}
case 7:
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yyDollar = yyS[yypt-3 : yypt+1]
//line expressions.y:62
{ // TODO can this be a variable?
switch yyDollar[2].name {
case "limit":
limit, ok := yyDollar[3].val.(int)
if !ok {
panic(ParseError(fmt.Sprintf("loop limit must an integer")))
}
yyDollar[1].loopmods.Limit = &limit
case "offset":
offset, ok := yyDollar[3].val.(int)
if !ok {
panic(ParseError(fmt.Sprintf("loop offset must an integer")))
}
yyDollar[1].loopmods.Offset = offset
default:
panic(ParseError(fmt.Sprintf("undefined loop modifier: %s", yyDollar[2].name)))
}
yyVAL.loopmods = yyDollar[1].loopmods
}
case 8:
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yyDollar = yyS[yypt-1 : yypt+1]
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//line expressions.y:84
{
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val := yyDollar[1].val
yyVAL.f = func(_ Context) interface{} { return val }
}
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case 9:
yyDollar = yyS[yypt-1 : yypt+1]
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//line expressions.y:85
{
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name := yyDollar[1].name
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yyVAL.f = func(ctx Context) interface{} { return ctx.Get(name) }
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}
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case 10:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:86
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{
yyVAL.f = makeObjectPropertyExpr(yyDollar[1].f, yyDollar[3].name)
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}
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case 11:
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yyDollar = yyS[yypt-4 : yypt+1]
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//line expressions.y:87
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{
yyVAL.f = makeIndexExpr(yyDollar[1].f, yyDollar[3].f)
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}
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case 12:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:88
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{
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yyVAL.f = yyDollar[2].f
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}
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case 14:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:93
{
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yyVAL.f = makeFilter(yyDollar[1].f, yyDollar[3].name, nil)
}
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case 15:
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yyDollar = yyS[yypt-4 : yypt+1]
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//line expressions.y:94
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{
yyVAL.f = makeFilter(yyDollar[1].f, yyDollar[3].name, yyDollar[4].filter_params)
}
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case 16:
yyDollar = yyS[yypt-1 : yypt+1]
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//line expressions.y:98
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{
yyVAL.filter_params = []valueFn{yyDollar[1].f}
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}
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case 17:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:100
{
yyVAL.filter_params = append(yyDollar[1].filter_params, yyDollar[3].f)
}
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case 19:
yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:104
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{
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fa, fb := yyDollar[1].f, yyDollar[3].f
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yyVAL.f = func(ctx Context) interface{} {
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a, b := fa(ctx), fb(ctx)
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return evaluator.Equal(a, b)
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}
}
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case 20:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:111
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{
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fa, fb := yyDollar[1].f, yyDollar[3].f
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yyVAL.f = func(ctx Context) interface{} {
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a, b := fa(ctx), fb(ctx)
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return !evaluator.Equal(a, b)
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}
}
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case 21:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:118
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{
fa, fb := yyDollar[1].f, yyDollar[3].f
yyVAL.f = func(ctx Context) interface{} {
a, b := fa(ctx), fb(ctx)
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return evaluator.Less(b, a)
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}
}
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case 22:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:125
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{
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fa, fb := yyDollar[1].f, yyDollar[3].f
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yyVAL.f = func(ctx Context) interface{} {
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a, b := fa(ctx), fb(ctx)
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return evaluator.Less(a, b)
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}
}
case 23:
yyDollar = yyS[yypt-3 : yypt+1]
//line expressions.y:132
{
fa, fb := yyDollar[1].f, yyDollar[3].f
yyVAL.f = func(ctx Context) interface{} {
a, b := fa(ctx), fb(ctx)
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return evaluator.Less(b, a) || evaluator.Equal(a, b)
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}
}
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case 24:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:139
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{
fa, fb := yyDollar[1].f, yyDollar[3].f
yyVAL.f = func(ctx Context) interface{} {
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a, b := fa(ctx), fb(ctx)
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return evaluator.Less(a, b) || evaluator.Equal(a, b)
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}
}
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case 25:
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yyDollar = yyS[yypt-3 : yypt+1]
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//line expressions.y:146
{
yyVAL.f = makeContainsExpr(yyDollar[1].f, yyDollar[3].f)
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}
case 27:
yyDollar = yyS[yypt-3 : yypt+1]
//line expressions.y:151
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{
fa, fb := yyDollar[1].f, yyDollar[3].f
yyVAL.f = func(ctx Context) interface{} {
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return evaluator.IsTrue(fa(ctx)) && evaluator.IsTrue(fb(ctx))
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}
}
case 28:
yyDollar = yyS[yypt-3 : yypt+1]
//line expressions.y:157
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{
fa, fb := yyDollar[1].f, yyDollar[3].f
yyVAL.f = func(ctx Context) interface{} {
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return evaluator.IsTrue(fa(ctx)) || evaluator.IsTrue(fb(ctx))
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}
}
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}
goto yystack /* stack new state and value */
}