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parser.go
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parser.go
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// Package parser is generated by gogll. Do not edit.
package parser
import (
"bytes"
"fmt"
"sort"
"strings"
"github.com/bruceiv/pegll/lexer"
"github.com/bruceiv/pegll/parser/bsr"
"github.com/bruceiv/pegll/parser/slot"
"github.com/bruceiv/pegll/parser/symbols"
"github.com/bruceiv/pegll/token"
)
type parser struct {
cI int
R *descriptors
U *descriptors
popped map[poppedNode]bool
crf map[clusterNode][]*crfNode
crfNodes map[crfNode]*crfNode
lex *lexer.Lexer
parseErrors []*Error
bsrSet *bsr.Set
}
func newParser(l *lexer.Lexer) *parser {
return &parser{
cI: 0,
lex: l,
R: &descriptors{},
U: &descriptors{},
popped: make(map[poppedNode]bool),
crf: map[clusterNode][]*crfNode{
{symbols.NT_GoGLL, 0}: {},
},
crfNodes: map[crfNode]*crfNode{},
bsrSet: bsr.New(symbols.NT_GoGLL, l),
parseErrors: nil,
}
}
// Parse returns the BSR set containing the parse forest.
// If the parse was successfull []*Error is nil
func Parse(l *lexer.Lexer) (*bsr.Set, []*Error) {
return newParser(l).parse()
}
func (p *parser) parse() (*bsr.Set, []*Error) {
var L slot.Label
m, cU := len(p.lex.Tokens)-1, 0
p.ntAdd(symbols.NT_GoGLL, 0)
// p.DumpDescriptors()
for !p.R.empty() {
L, cU, p.cI = p.R.remove()
// fmt.Println()
// fmt.Printf("L:%s, cI:%d, I[p.cI]:%s, cU:%d\n", L, p.cI, p.lex.Tokens[p.cI], cU)
// p.DumpDescriptors()
switch L {
case slot.GoGLL0R0: // GoGLL : ∙Package Rules
p.call(slot.GoGLL0R1, cU, p.cI)
case slot.GoGLL0R1: // GoGLL : Package ∙Rules
if !p.testSelect(slot.GoGLL0R1) {
p.parseError(slot.GoGLL0R1, p.cI, first[slot.GoGLL0R1])
break
}
p.call(slot.GoGLL0R2, cU, p.cI)
case slot.GoGLL0R2: // GoGLL : Package Rules ∙
p.rtn(symbols.NT_GoGLL, cU, p.cI)
case slot.LexAlternates0R0: // LexAlternates : ∙RegExp
p.call(slot.LexAlternates0R1, cU, p.cI)
case slot.LexAlternates0R1: // LexAlternates : RegExp ∙
p.rtn(symbols.NT_LexAlternates, cU, p.cI)
case slot.LexAlternates1R0: // LexAlternates : ∙RegExp | LexAlternates
p.call(slot.LexAlternates1R1, cU, p.cI)
case slot.LexAlternates1R1: // LexAlternates : RegExp ∙| LexAlternates
if !p.testSelect(slot.LexAlternates1R1) {
p.parseError(slot.LexAlternates1R1, p.cI, first[slot.LexAlternates1R1])
break
}
p.bsrSet.Add(slot.LexAlternates1R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexAlternates1R2) {
p.parseError(slot.LexAlternates1R2, p.cI, first[slot.LexAlternates1R2])
break
}
p.call(slot.LexAlternates1R3, cU, p.cI)
case slot.LexAlternates1R3: // LexAlternates : RegExp | LexAlternates ∙
p.rtn(symbols.NT_LexAlternates, cU, p.cI)
case slot.LexBracket0R0: // LexBracket : ∙LexGroup
p.call(slot.LexBracket0R1, cU, p.cI)
case slot.LexBracket0R1: // LexBracket : LexGroup ∙
p.rtn(symbols.NT_LexBracket, cU, p.cI)
case slot.LexBracket1R0: // LexBracket : ∙LexOptional
p.call(slot.LexBracket1R1, cU, p.cI)
case slot.LexBracket1R1: // LexBracket : LexOptional ∙
p.rtn(symbols.NT_LexBracket, cU, p.cI)
case slot.LexBracket2R0: // LexBracket : ∙LexZeroOrMore
p.call(slot.LexBracket2R1, cU, p.cI)
case slot.LexBracket2R1: // LexBracket : LexZeroOrMore ∙
p.rtn(symbols.NT_LexBracket, cU, p.cI)
case slot.LexBracket3R0: // LexBracket : ∙LexOneOrMore
p.call(slot.LexBracket3R1, cU, p.cI)
case slot.LexBracket3R1: // LexBracket : LexOneOrMore ∙
p.rtn(symbols.NT_LexBracket, cU, p.cI)
case slot.LexGroup0R0: // LexGroup : ∙( LexAlternates )
p.bsrSet.Add(slot.LexGroup0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexGroup0R1) {
p.parseError(slot.LexGroup0R1, p.cI, first[slot.LexGroup0R1])
break
}
p.call(slot.LexGroup0R2, cU, p.cI)
case slot.LexGroup0R2: // LexGroup : ( LexAlternates ∙)
if !p.testSelect(slot.LexGroup0R2) {
p.parseError(slot.LexGroup0R2, p.cI, first[slot.LexGroup0R2])
break
}
p.bsrSet.Add(slot.LexGroup0R3, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexGroup, cU, p.cI)
case slot.LexOneOrMore0R0: // LexOneOrMore : ∙< LexAlternates >
p.bsrSet.Add(slot.LexOneOrMore0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexOneOrMore0R1) {
p.parseError(slot.LexOneOrMore0R1, p.cI, first[slot.LexOneOrMore0R1])
break
}
p.call(slot.LexOneOrMore0R2, cU, p.cI)
case slot.LexOneOrMore0R2: // LexOneOrMore : < LexAlternates ∙>
if !p.testSelect(slot.LexOneOrMore0R2) {
p.parseError(slot.LexOneOrMore0R2, p.cI, first[slot.LexOneOrMore0R2])
break
}
p.bsrSet.Add(slot.LexOneOrMore0R3, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexOneOrMore, cU, p.cI)
case slot.LexOptional0R0: // LexOptional : ∙[ LexAlternates ]
p.bsrSet.Add(slot.LexOptional0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexOptional0R1) {
p.parseError(slot.LexOptional0R1, p.cI, first[slot.LexOptional0R1])
break
}
p.call(slot.LexOptional0R2, cU, p.cI)
case slot.LexOptional0R2: // LexOptional : [ LexAlternates ∙]
if !p.testSelect(slot.LexOptional0R2) {
p.parseError(slot.LexOptional0R2, p.cI, first[slot.LexOptional0R2])
break
}
p.bsrSet.Add(slot.LexOptional0R3, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexOptional, cU, p.cI)
case slot.LexRule0R0: // LexRule : ∙tokid : RegExp ;
p.bsrSet.Add(slot.LexRule0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexRule0R1) {
p.parseError(slot.LexRule0R1, p.cI, first[slot.LexRule0R1])
break
}
p.bsrSet.Add(slot.LexRule0R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexRule0R2) {
p.parseError(slot.LexRule0R2, p.cI, first[slot.LexRule0R2])
break
}
p.call(slot.LexRule0R3, cU, p.cI)
case slot.LexRule0R3: // LexRule : tokid : RegExp ∙;
if !p.testSelect(slot.LexRule0R3) {
p.parseError(slot.LexRule0R3, p.cI, first[slot.LexRule0R3])
break
}
p.bsrSet.Add(slot.LexRule0R4, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexRule, cU, p.cI)
case slot.LexRule1R0: // LexRule : ∙! tokid : RegExp ;
p.bsrSet.Add(slot.LexRule1R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexRule1R1) {
p.parseError(slot.LexRule1R1, p.cI, first[slot.LexRule1R1])
break
}
p.bsrSet.Add(slot.LexRule1R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexRule1R2) {
p.parseError(slot.LexRule1R2, p.cI, first[slot.LexRule1R2])
break
}
p.bsrSet.Add(slot.LexRule1R3, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexRule1R3) {
p.parseError(slot.LexRule1R3, p.cI, first[slot.LexRule1R3])
break
}
p.call(slot.LexRule1R4, cU, p.cI)
case slot.LexRule1R4: // LexRule : ! tokid : RegExp ∙;
if !p.testSelect(slot.LexRule1R4) {
p.parseError(slot.LexRule1R4, p.cI, first[slot.LexRule1R4])
break
}
p.bsrSet.Add(slot.LexRule1R5, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexRule, cU, p.cI)
case slot.LexSymbol0R0: // LexSymbol : ∙.
p.bsrSet.Add(slot.LexSymbol0R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexSymbol1R0: // LexSymbol : ∙any string_lit
p.bsrSet.Add(slot.LexSymbol1R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexSymbol1R1) {
p.parseError(slot.LexSymbol1R1, p.cI, first[slot.LexSymbol1R1])
break
}
p.bsrSet.Add(slot.LexSymbol1R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexSymbol2R0: // LexSymbol : ∙char_lit
p.bsrSet.Add(slot.LexSymbol2R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexSymbol3R0: // LexSymbol : ∙LexBracket
p.call(slot.LexSymbol3R1, cU, p.cI)
case slot.LexSymbol3R1: // LexSymbol : LexBracket ∙
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexSymbol4R0: // LexSymbol : ∙not string_lit
p.bsrSet.Add(slot.LexSymbol4R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexSymbol4R1) {
p.parseError(slot.LexSymbol4R1, p.cI, first[slot.LexSymbol4R1])
break
}
p.bsrSet.Add(slot.LexSymbol4R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexSymbol5R0: // LexSymbol : ∙UnicodeClass
p.call(slot.LexSymbol5R1, cU, p.cI)
case slot.LexSymbol5R1: // LexSymbol : UnicodeClass ∙
p.rtn(symbols.NT_LexSymbol, cU, p.cI)
case slot.LexZeroOrMore0R0: // LexZeroOrMore : ∙{ LexAlternates }
p.bsrSet.Add(slot.LexZeroOrMore0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.LexZeroOrMore0R1) {
p.parseError(slot.LexZeroOrMore0R1, p.cI, first[slot.LexZeroOrMore0R1])
break
}
p.call(slot.LexZeroOrMore0R2, cU, p.cI)
case slot.LexZeroOrMore0R2: // LexZeroOrMore : { LexAlternates ∙}
if !p.testSelect(slot.LexZeroOrMore0R2) {
p.parseError(slot.LexZeroOrMore0R2, p.cI, first[slot.LexZeroOrMore0R2])
break
}
p.bsrSet.Add(slot.LexZeroOrMore0R3, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_LexZeroOrMore, cU, p.cI)
case slot.OrderedAlternates0R0: // OrderedAlternates : ∙SyntaxAlternate
p.call(slot.OrderedAlternates0R1, cU, p.cI)
case slot.OrderedAlternates0R1: // OrderedAlternates : SyntaxAlternate ∙
p.rtn(symbols.NT_OrderedAlternates, cU, p.cI)
case slot.OrderedAlternates1R0: // OrderedAlternates : ∙SyntaxAlternate / OrderedAlternates
p.call(slot.OrderedAlternates1R1, cU, p.cI)
case slot.OrderedAlternates1R1: // OrderedAlternates : SyntaxAlternate ∙/ OrderedAlternates
if !p.testSelect(slot.OrderedAlternates1R1) {
p.parseError(slot.OrderedAlternates1R1, p.cI, first[slot.OrderedAlternates1R1])
break
}
p.bsrSet.Add(slot.OrderedAlternates1R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.OrderedAlternates1R2) {
p.parseError(slot.OrderedAlternates1R2, p.cI, first[slot.OrderedAlternates1R2])
break
}
p.call(slot.OrderedAlternates1R3, cU, p.cI)
case slot.OrderedAlternates1R3: // OrderedAlternates : SyntaxAlternate / OrderedAlternates ∙
p.rtn(symbols.NT_OrderedAlternates, cU, p.cI)
case slot.Package0R0: // Package : ∙package string_lit
p.bsrSet.Add(slot.Package0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.Package0R1) {
p.parseError(slot.Package0R1, p.cI, first[slot.Package0R1])
break
}
p.bsrSet.Add(slot.Package0R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_Package, cU, p.cI)
case slot.RegExp0R0: // RegExp : ∙LexSymbol
p.call(slot.RegExp0R1, cU, p.cI)
case slot.RegExp0R1: // RegExp : LexSymbol ∙
p.rtn(symbols.NT_RegExp, cU, p.cI)
case slot.RegExp1R0: // RegExp : ∙LexSymbol RegExp
p.call(slot.RegExp1R1, cU, p.cI)
case slot.RegExp1R1: // RegExp : LexSymbol ∙RegExp
if !p.testSelect(slot.RegExp1R1) {
p.parseError(slot.RegExp1R1, p.cI, first[slot.RegExp1R1])
break
}
p.call(slot.RegExp1R2, cU, p.cI)
case slot.RegExp1R2: // RegExp : LexSymbol RegExp ∙
p.rtn(symbols.NT_RegExp, cU, p.cI)
case slot.Rule0R0: // Rule : ∙LexRule
p.call(slot.Rule0R1, cU, p.cI)
case slot.Rule0R1: // Rule : LexRule ∙
p.rtn(symbols.NT_Rule, cU, p.cI)
case slot.Rule1R0: // Rule : ∙SyntaxRule
p.call(slot.Rule1R1, cU, p.cI)
case slot.Rule1R1: // Rule : SyntaxRule ∙
p.rtn(symbols.NT_Rule, cU, p.cI)
case slot.Rules0R0: // Rules : ∙Rule
p.call(slot.Rules0R1, cU, p.cI)
case slot.Rules0R1: // Rules : Rule ∙
p.rtn(symbols.NT_Rules, cU, p.cI)
case slot.Rules1R0: // Rules : ∙Rule Rules
p.call(slot.Rules1R1, cU, p.cI)
case slot.Rules1R1: // Rules : Rule ∙Rules
if !p.testSelect(slot.Rules1R1) {
p.parseError(slot.Rules1R1, p.cI, first[slot.Rules1R1])
break
}
p.call(slot.Rules1R2, cU, p.cI)
case slot.Rules1R2: // Rules : Rule Rules ∙
p.rtn(symbols.NT_Rules, cU, p.cI)
case slot.SyntaxAlternate0R0: // SyntaxAlternate : ∙SyntaxSymbols
p.call(slot.SyntaxAlternate0R1, cU, p.cI)
case slot.SyntaxAlternate0R1: // SyntaxAlternate : SyntaxSymbols ∙
p.rtn(symbols.NT_SyntaxAlternate, cU, p.cI)
case slot.SyntaxAlternate1R0: // SyntaxAlternate : ∙empty
p.bsrSet.Add(slot.SyntaxAlternate1R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxAlternate, cU, p.cI)
case slot.SyntaxAlternates0R0: // SyntaxAlternates : ∙SyntaxAlternate
p.call(slot.SyntaxAlternates0R1, cU, p.cI)
case slot.SyntaxAlternates0R1: // SyntaxAlternates : SyntaxAlternate ∙
p.rtn(symbols.NT_SyntaxAlternates, cU, p.cI)
case slot.SyntaxAlternates1R0: // SyntaxAlternates : ∙SyntaxAlternate | UnorderedAlternates
p.call(slot.SyntaxAlternates1R1, cU, p.cI)
case slot.SyntaxAlternates1R1: // SyntaxAlternates : SyntaxAlternate ∙| UnorderedAlternates
if !p.testSelect(slot.SyntaxAlternates1R1) {
p.parseError(slot.SyntaxAlternates1R1, p.cI, first[slot.SyntaxAlternates1R1])
break
}
p.bsrSet.Add(slot.SyntaxAlternates1R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxAlternates1R2) {
p.parseError(slot.SyntaxAlternates1R2, p.cI, first[slot.SyntaxAlternates1R2])
break
}
p.call(slot.SyntaxAlternates1R3, cU, p.cI)
case slot.SyntaxAlternates1R3: // SyntaxAlternates : SyntaxAlternate | UnorderedAlternates ∙
p.rtn(symbols.NT_SyntaxAlternates, cU, p.cI)
case slot.SyntaxAlternates2R0: // SyntaxAlternates : ∙SyntaxAlternate / OrderedAlternates
p.call(slot.SyntaxAlternates2R1, cU, p.cI)
case slot.SyntaxAlternates2R1: // SyntaxAlternates : SyntaxAlternate ∙/ OrderedAlternates
if !p.testSelect(slot.SyntaxAlternates2R1) {
p.parseError(slot.SyntaxAlternates2R1, p.cI, first[slot.SyntaxAlternates2R1])
break
}
p.bsrSet.Add(slot.SyntaxAlternates2R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxAlternates2R2) {
p.parseError(slot.SyntaxAlternates2R2, p.cI, first[slot.SyntaxAlternates2R2])
break
}
p.call(slot.SyntaxAlternates2R3, cU, p.cI)
case slot.SyntaxAlternates2R3: // SyntaxAlternates : SyntaxAlternate / OrderedAlternates ∙
p.rtn(symbols.NT_SyntaxAlternates, cU, p.cI)
case slot.SyntaxAtom0R0: // SyntaxAtom : ∙nt
p.bsrSet.Add(slot.SyntaxAtom0R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxAtom, cU, p.cI)
case slot.SyntaxAtom1R0: // SyntaxAtom : ∙tokid
p.bsrSet.Add(slot.SyntaxAtom1R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxAtom, cU, p.cI)
case slot.SyntaxAtom2R0: // SyntaxAtom : ∙string_lit
p.bsrSet.Add(slot.SyntaxAtom2R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxAtom, cU, p.cI)
case slot.SyntaxRule0R0: // SyntaxRule : ∙nt : SyntaxAlternates ;
p.bsrSet.Add(slot.SyntaxRule0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxRule0R1) {
p.parseError(slot.SyntaxRule0R1, p.cI, first[slot.SyntaxRule0R1])
break
}
p.bsrSet.Add(slot.SyntaxRule0R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxRule0R2) {
p.parseError(slot.SyntaxRule0R2, p.cI, first[slot.SyntaxRule0R2])
break
}
p.call(slot.SyntaxRule0R3, cU, p.cI)
case slot.SyntaxRule0R3: // SyntaxRule : nt : SyntaxAlternates ∙;
if !p.testSelect(slot.SyntaxRule0R3) {
p.parseError(slot.SyntaxRule0R3, p.cI, first[slot.SyntaxRule0R3])
break
}
p.bsrSet.Add(slot.SyntaxRule0R4, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxRule, cU, p.cI)
case slot.SyntaxSuffix0R0: // SyntaxSuffix : ∙SyntaxAtom ?
p.call(slot.SyntaxSuffix0R1, cU, p.cI)
case slot.SyntaxSuffix0R1: // SyntaxSuffix : SyntaxAtom ∙?
if !p.testSelect(slot.SyntaxSuffix0R1) {
p.parseError(slot.SyntaxSuffix0R1, p.cI, first[slot.SyntaxSuffix0R1])
break
}
p.bsrSet.Add(slot.SyntaxSuffix0R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxSuffix, cU, p.cI)
case slot.SyntaxSuffix1R0: // SyntaxSuffix : ∙SyntaxAtom *
p.call(slot.SyntaxSuffix1R1, cU, p.cI)
case slot.SyntaxSuffix1R1: // SyntaxSuffix : SyntaxAtom ∙*
if !p.testSelect(slot.SyntaxSuffix1R1) {
p.parseError(slot.SyntaxSuffix1R1, p.cI, first[slot.SyntaxSuffix1R1])
break
}
p.bsrSet.Add(slot.SyntaxSuffix1R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxSuffix, cU, p.cI)
case slot.SyntaxSuffix2R0: // SyntaxSuffix : ∙SyntaxAtom +
p.call(slot.SyntaxSuffix2R1, cU, p.cI)
case slot.SyntaxSuffix2R1: // SyntaxSuffix : SyntaxAtom ∙+
if !p.testSelect(slot.SyntaxSuffix2R1) {
p.parseError(slot.SyntaxSuffix2R1, p.cI, first[slot.SyntaxSuffix2R1])
break
}
p.bsrSet.Add(slot.SyntaxSuffix2R2, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_SyntaxSuffix, cU, p.cI)
case slot.SyntaxSymbol0R0: // SyntaxSymbol : ∙& SyntaxAtom
p.bsrSet.Add(slot.SyntaxSymbol0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxSymbol0R1) {
p.parseError(slot.SyntaxSymbol0R1, p.cI, first[slot.SyntaxSymbol0R1])
break
}
p.call(slot.SyntaxSymbol0R2, cU, p.cI)
case slot.SyntaxSymbol0R2: // SyntaxSymbol : & SyntaxAtom ∙
p.rtn(symbols.NT_SyntaxSymbol, cU, p.cI)
case slot.SyntaxSymbol1R0: // SyntaxSymbol : ∙! SyntaxAtom
p.bsrSet.Add(slot.SyntaxSymbol1R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.SyntaxSymbol1R1) {
p.parseError(slot.SyntaxSymbol1R1, p.cI, first[slot.SyntaxSymbol1R1])
break
}
p.call(slot.SyntaxSymbol1R2, cU, p.cI)
case slot.SyntaxSymbol1R2: // SyntaxSymbol : ! SyntaxAtom ∙
p.rtn(symbols.NT_SyntaxSymbol, cU, p.cI)
case slot.SyntaxSymbol2R0: // SyntaxSymbol : ∙SyntaxSuffix
p.call(slot.SyntaxSymbol2R1, cU, p.cI)
case slot.SyntaxSymbol2R1: // SyntaxSymbol : SyntaxSuffix ∙
p.rtn(symbols.NT_SyntaxSymbol, cU, p.cI)
case slot.SyntaxSymbol3R0: // SyntaxSymbol : ∙SyntaxAtom
p.call(slot.SyntaxSymbol3R1, cU, p.cI)
case slot.SyntaxSymbol3R1: // SyntaxSymbol : SyntaxAtom ∙
p.rtn(symbols.NT_SyntaxSymbol, cU, p.cI)
case slot.SyntaxSymbols0R0: // SyntaxSymbols : ∙SyntaxSymbol
p.call(slot.SyntaxSymbols0R1, cU, p.cI)
case slot.SyntaxSymbols0R1: // SyntaxSymbols : SyntaxSymbol ∙
p.rtn(symbols.NT_SyntaxSymbols, cU, p.cI)
case slot.SyntaxSymbols1R0: // SyntaxSymbols : ∙SyntaxSymbol SyntaxSymbols
p.call(slot.SyntaxSymbols1R1, cU, p.cI)
case slot.SyntaxSymbols1R1: // SyntaxSymbols : SyntaxSymbol ∙SyntaxSymbols
if !p.testSelect(slot.SyntaxSymbols1R1) {
p.parseError(slot.SyntaxSymbols1R1, p.cI, first[slot.SyntaxSymbols1R1])
break
}
p.call(slot.SyntaxSymbols1R2, cU, p.cI)
case slot.SyntaxSymbols1R2: // SyntaxSymbols : SyntaxSymbol SyntaxSymbols ∙
p.rtn(symbols.NT_SyntaxSymbols, cU, p.cI)
case slot.UnicodeClass0R0: // UnicodeClass : ∙letter
p.bsrSet.Add(slot.UnicodeClass0R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_UnicodeClass, cU, p.cI)
case slot.UnicodeClass1R0: // UnicodeClass : ∙upcase
p.bsrSet.Add(slot.UnicodeClass1R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_UnicodeClass, cU, p.cI)
case slot.UnicodeClass2R0: // UnicodeClass : ∙lowcase
p.bsrSet.Add(slot.UnicodeClass2R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_UnicodeClass, cU, p.cI)
case slot.UnicodeClass3R0: // UnicodeClass : ∙number
p.bsrSet.Add(slot.UnicodeClass3R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_UnicodeClass, cU, p.cI)
case slot.UnorderedAlternates0R0: // UnorderedAlternates : ∙SyntaxAlternate
p.call(slot.UnorderedAlternates0R1, cU, p.cI)
case slot.UnorderedAlternates0R1: // UnorderedAlternates : SyntaxAlternate ∙
p.rtn(symbols.NT_UnorderedAlternates, cU, p.cI)
case slot.UnorderedAlternates1R0: // UnorderedAlternates : ∙SyntaxAlternate | UnorderedAlternates
p.call(slot.UnorderedAlternates1R1, cU, p.cI)
case slot.UnorderedAlternates1R1: // UnorderedAlternates : SyntaxAlternate ∙| UnorderedAlternates
if !p.testSelect(slot.UnorderedAlternates1R1) {
p.parseError(slot.UnorderedAlternates1R1, p.cI, first[slot.UnorderedAlternates1R1])
break
}
p.bsrSet.Add(slot.UnorderedAlternates1R2, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.UnorderedAlternates1R2) {
p.parseError(slot.UnorderedAlternates1R2, p.cI, first[slot.UnorderedAlternates1R2])
break
}
p.call(slot.UnorderedAlternates1R3, cU, p.cI)
case slot.UnorderedAlternates1R3: // UnorderedAlternates : SyntaxAlternate | UnorderedAlternates ∙
p.rtn(symbols.NT_UnorderedAlternates, cU, p.cI)
default:
panic("This must not happen")
}
}
if !p.bsrSet.Contain(symbols.NT_GoGLL, 0, m) {
p.sortParseErrors()
return nil, p.parseErrors
}
return p.bsrSet, nil
}
func (p *parser) ntAdd(nt symbols.NT, j int) {
// fmt.Printf("p.ntAdd(%s, %d)\n", nt, j)
failed := true
expected := map[token.Type]string{}
for _, l := range slot.GetAlternates(nt) {
if p.testSelect(l) {
p.dscAdd(l, j, j)
failed = false
} else {
for k, v := range first[l] {
expected[k] = v
}
}
}
if failed {
for _, l := range slot.GetAlternates(nt) {
p.parseError(l, j, expected)
}
}
}
/*** Call Return Forest ***/
type poppedNode struct {
X symbols.NT
k, j int
}
type clusterNode struct {
X symbols.NT
k int
}
type crfNode struct {
L slot.Label
i int
}
/*
suppose that L is Y ::=αX ·β
if there is no CRF node labelled (L,i)
create one let u be the CRF node labelled (L,i)
if there is no CRF node labelled (X, j) {
create a CRF node v labelled (X, j)
create an edge from v to u
ntAdd(X, j)
} else {
let v be the CRF node labelled (X, j)
if there is not an edge from v to u {
create an edge from v to u
for all ((X, j,h)∈P) {
dscAdd(L, i, h);
bsrAdd(L, i, j, h)
}
}
}
*/
func (p *parser) call(L slot.Label, i, j int) {
// fmt.Printf("p.call(%s,%d,%d)\n", L,i,j)
u, exist := p.crfNodes[crfNode{L, i}]
// fmt.Printf(" u exist=%t\n", exist)
if !exist {
u = &crfNode{L, i}
p.crfNodes[*u] = u
}
X := L.Symbols()[L.Pos()-1].(symbols.NT)
ndV := clusterNode{X, j}
v, exist := p.crf[ndV]
if !exist {
// fmt.Println(" v !exist")
p.crf[ndV] = []*crfNode{u}
p.ntAdd(X, j)
} else {
// fmt.Println(" v exist")
if !existEdge(v, u) {
// fmt.Printf(" !existEdge(%v)\n", u)
p.crf[ndV] = append(v, u)
// fmt.Printf("|popped|=%d\n", len(popped))
for pnd := range p.popped {
if pnd.X == X && pnd.k == j {
p.dscAdd(L, i, pnd.j)
p.bsrSet.Add(L, i, j, pnd.j)
}
}
}
}
}
func existEdge(nds []*crfNode, nd *crfNode) bool {
for _, nd1 := range nds {
if nd1 == nd {
return true
}
}
return false
}
func (p *parser) rtn(X symbols.NT, k, j int) {
// fmt.Printf("p.rtn(%s,%d,%d)\n", X,k,j)
pn := poppedNode{X, k, j}
if _, exist := p.popped[pn]; !exist {
p.popped[pn] = true
for _, nd := range p.crf[clusterNode{X, k}] {
p.dscAdd(nd.L, nd.i, j)
p.bsrSet.Add(nd.L, nd.i, k, j)
}
}
}
// func CRFString() string {
// buf := new(bytes.Buffer)
// buf.WriteString("CRF: {")
// for cn, nds := range crf{
// for _, nd := range nds {
// fmt.Fprintf(buf, "%s->%s, ", cn, nd)
// }
// }
// buf.WriteString("}")
// return buf.String()
// }
func (cn clusterNode) String() string {
return fmt.Sprintf("(%s,%d)", cn.X, cn.k)
}
func (n crfNode) String() string {
return fmt.Sprintf("(%s,%d)", n.L.String(), n.i)
}
// func PoppedString() string {
// buf := new(bytes.Buffer)
// buf.WriteString("Popped: {")
// for p, _ := range popped {
// fmt.Fprintf(buf, "(%s,%d,%d) ", p.X, p.k, p.j)
// }
// buf.WriteString("}")
// return buf.String()
// }
/*** descriptors ***/
type descriptors struct {
set []*descriptor
}
func (ds *descriptors) contain(d *descriptor) bool {
for _, d1 := range ds.set {
if d1 == d {
return true
}
}
return false
}
func (ds *descriptors) empty() bool {
return len(ds.set) == 0
}
func (ds *descriptors) String() string {
buf := new(bytes.Buffer)
buf.WriteString("{")
for i, d := range ds.set {
if i > 0 {
buf.WriteString("; ")
}
fmt.Fprintf(buf, "%s", d)
}
buf.WriteString("}")
return buf.String()
}
type descriptor struct {
L slot.Label
k int
i int
}
func (d *descriptor) String() string {
return fmt.Sprintf("%s,%d,%d", d.L, d.k, d.i)
}
func (p *parser) dscAdd(L slot.Label, k, i int) {
// fmt.Printf("p.dscAdd(%s,%d,%d)\n", L, k, i)
d := &descriptor{L, k, i}
if !p.U.contain(d) {
p.R.set = append(p.R.set, d)
p.U.set = append(p.U.set, d)
}
}
func (ds *descriptors) remove() (L slot.Label, k, i int) {
d := ds.set[len(ds.set)-1]
ds.set = ds.set[:len(ds.set)-1]
// fmt.Printf("remove: %s,%d,%d\n", d.L, d.k, d.i)
return d.L, d.k, d.i
}
func (p *parser) DumpDescriptors() {
p.DumpR()
p.DumpU()
}
func (p *parser) DumpR() {
fmt.Println("R:")
for _, d := range p.R.set {
fmt.Printf(" %s\n", d)
}
}
func (p *parser) DumpU() {
fmt.Println("U:")
for _, d := range p.U.set {
fmt.Printf(" %s\n", d)
}
}
/*** TestSelect ***/
func (p *parser) follow(nt symbols.NT) bool {
_, exist := followSets[nt][p.lex.Tokens[p.cI].Type()]
return exist
}
func (p *parser) testSelect(l slot.Label) bool {
return l.IsNullable() || l.FirstContains(p.lex.Tokens[p.cI].Type())
// _, exist := first[l][p.lex.Tokens[p.cI].Type()]
// return exist
}
var first = []map[token.Type]string{
// GoGLL : ∙Package Rules
{
token.T_23: "package",
},
// GoGLL : Package ∙Rules
{
token.T_0: "!",
token.T_21: "nt",
token.T_25: "tokid",
},
// GoGLL : Package Rules ∙
{
token.EOF: "$",
},
// LexAlternates : ∙RegExp
{
token.T_2: "(",
token.T_6: ".",
token.T_10: "<",
token.T_13: "[",
token.T_15: "any",
token.T_16: "char_lit",
token.T_18: "letter",
token.T_19: "lowcase",
token.T_20: "not",
token.T_22: "number",
token.T_26: "upcase",
token.T_27: "{",
},
// LexAlternates : RegExp ∙
{
token.T_3: ")",
token.T_11: ">",
token.T_14: "]",
token.T_29: "}",
},
// LexAlternates : ∙RegExp | LexAlternates
{
token.T_2: "(",
token.T_6: ".",
token.T_10: "<",
token.T_13: "[",
token.T_15: "any",
token.T_16: "char_lit",
token.T_18: "letter",
token.T_19: "lowcase",
token.T_20: "not",
token.T_22: "number",
token.T_26: "upcase",
token.T_27: "{",
},
// LexAlternates : RegExp ∙| LexAlternates
{
token.T_28: "|",
},
// LexAlternates : RegExp | ∙LexAlternates
{
token.T_2: "(",
token.T_6: ".",
token.T_10: "<",
token.T_13: "[",
token.T_15: "any",
token.T_16: "char_lit",
token.T_18: "letter",
token.T_19: "lowcase",
token.T_20: "not",
token.T_22: "number",
token.T_26: "upcase",
token.T_27: "{",
},
// LexAlternates : RegExp | LexAlternates ∙
{
token.T_3: ")",
token.T_11: ">",
token.T_14: "]",
token.T_29: "}",
},
// LexBracket : ∙LexGroup
{
token.T_2: "(",
},
// LexBracket : LexGroup ∙
{
token.T_2: "(",
token.T_3: ")",
token.T_6: ".",
token.T_9: ";",
token.T_10: "<",
token.T_11: ">",
token.T_13: "[",
token.T_14: "]",
token.T_15: "any",
token.T_16: "char_lit",
token.T_18: "letter",
token.T_19: "lowcase",
token.T_20: "not",
token.T_22: "number",
token.T_26: "upcase",
token.T_27: "{",
token.T_28: "|",
token.T_29: "}",
},
// LexBracket : ∙LexOptional