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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"
"calc/lexer"
"calc/parser/bsr"
"calc/parser/slot"
"calc/parser/symbols"
"calc/token"
)
type parser struct {
cI int
R *descriptors
U *descriptors
popped map[poppedNode]bool
crf_m map[clusterNode][]*crfNode
crf_f map[clusterNode][]*crfNode
crfNodes map[crfNode]*crfNode
lex *lexer.Lexer
parseErrors []*Error
bsrSet *bsr.Set
}
// index used for non-matches
const failInd = -1
func newParser(l *lexer.Lexer) *parser {
return &parser{
cI: 0,
lex: l,
R: &descriptors{},
U: &descriptors{},
popped: make(map[poppedNode]bool),
crf_m: map[clusterNode][]*crfNode{
{symbols.NT_EXPR, 0}: {},
},
crf_f: map[clusterNode][]*crfNode{},
crfNodes: map[crfNode]*crfNode{},
bsrSet: bsr.New(symbols.NT_EXPR, 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_EXPR, 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()
for {
switch L {
case slot.CLOSE0R0: // CLOSE : ∙) WS
if !p.testSelect(slot.CLOSE0R0) {
p.parseError(slot.CLOSE0R0, p.cI, first[slot.CLOSE0R0])
L, p.cI = slot.CLOSE1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.CLOSE0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.CLOSE0R1) {
p.parseError(slot.CLOSE0R1, p.cI, first[slot.CLOSE0R1])
L, p.cI = slot.CLOSE1F0, cU
goto nextSlot
}
p.call(slot.CLOSE0R2, slot.CLOSE1F0, symbols.NT_WS, cU, p.cI)
case slot.CLOSE0R2: // CLOSE : ) WS ∙
p.rtn(symbols.NT_CLOSE, cU, p.cI)
case slot.CLOSE1F0: // CLOSE failure case
p.rtn(symbols.NT_CLOSE, cU, failInd)
case slot.DIVIDE0R0: // DIVIDE : ∙/ WS
if !p.testSelect(slot.DIVIDE0R0) {
p.parseError(slot.DIVIDE0R0, p.cI, first[slot.DIVIDE0R0])
L, p.cI = slot.DIVIDE1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.DIVIDE0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.DIVIDE0R1) {
p.parseError(slot.DIVIDE0R1, p.cI, first[slot.DIVIDE0R1])
L, p.cI = slot.DIVIDE1F0, cU
goto nextSlot
}
p.call(slot.DIVIDE0R2, slot.DIVIDE1F0, symbols.NT_WS, cU, p.cI)
case slot.DIVIDE0R2: // DIVIDE : / WS ∙
p.rtn(symbols.NT_DIVIDE, cU, p.cI)
case slot.DIVIDE1F0: // DIVIDE failure case
p.rtn(symbols.NT_DIVIDE, cU, failInd)
case slot.ELEMENT0R0: // ELEMENT : ∙OPEN SUM CLOSE
if !p.testSelect(slot.ELEMENT0R0) {
p.parseError(slot.ELEMENT0R0, p.cI, first[slot.ELEMENT0R0])
L, p.cI = slot.ELEMENT1R0, cU
goto nextSlot
}
p.call(slot.ELEMENT0R1, slot.ELEMENT1R0, symbols.NT_OPEN, cU, p.cI)
case slot.ELEMENT0R1: // ELEMENT : OPEN ∙SUM CLOSE
p.rtn(symbols.NT_ELEMENT, cU, p.cI)
L, p.cI = slot.ELEMENT1M0, cU
goto nextSlot
if !p.testSelect(slot.ELEMENT0R1) {
p.parseError(slot.ELEMENT0R1, p.cI, first[slot.ELEMENT0R1])
L, p.cI = slot.ELEMENT1R0, cU
goto nextSlot
}
p.call(slot.ELEMENT0R2, slot.ELEMENT1R0, symbols.NT_SUM, cU, p.cI)
case slot.ELEMENT0R2: // ELEMENT : OPEN SUM ∙CLOSE
p.rtn(symbols.NT_ELEMENT, cU, p.cI)
L, p.cI = slot.ELEMENT1M0, cU
goto nextSlot
if !p.testSelect(slot.ELEMENT0R2) {
p.parseError(slot.ELEMENT0R2, p.cI, first[slot.ELEMENT0R2])
L, p.cI = slot.ELEMENT1R0, cU
goto nextSlot
}
p.call(slot.ELEMENT0R3, slot.ELEMENT1R0, symbols.NT_CLOSE, cU, p.cI)
case slot.ELEMENT0R3: // ELEMENT : OPEN SUM CLOSE ∙
p.rtn(symbols.NT_ELEMENT, cU, p.cI)
L, p.cI = slot.ELEMENT1M0, cU
goto nextSlot
case slot.ELEMENT1R0: // ELEMENT : ∙Number
if !p.testSelect(slot.ELEMENT1R0) {
p.parseError(slot.ELEMENT1R0, p.cI, first[slot.ELEMENT1R0])
L, p.cI = slot.ELEMENT2F0, cU
goto nextSlot
}
p.call(slot.ELEMENT1R1, slot.ELEMENT2F0, symbols.NT_Number, cU, p.cI)
case slot.ELEMENT1R1: // ELEMENT : Number ∙
p.rtn(symbols.NT_ELEMENT, cU, p.cI)
case slot.ELEMENT1M0: // ELEMENT : ∙Number [with previous match]
if !p.testSelect(slot.ELEMENT1R0) {
p.parseError(slot.ELEMENT1R0, p.cI, first[slot.ELEMENT1R0])
}
p.call(slot.ELEMENT1M0, failInd, symbols.NT_Number, cU, p.cI)
case slot.ELEMENT1M0: // ELEMENT : Number ∙
p.rtn(symbols.NT_ELEMENT, cU, p.cI)
case slot.ELEMENT2F0: // ELEMENT failure case
p.rtn(symbols.NT_ELEMENT, cU, failInd)
case slot.EXPR0R0: // EXPR : ∙WS SUM
if !p.testSelect(slot.EXPR0R0) {
p.parseError(slot.EXPR0R0, p.cI, first[slot.EXPR0R0])
L, p.cI = slot.EXPR1F0, cU
goto nextSlot
}
p.call(slot.EXPR0R1, slot.EXPR1F0, symbols.NT_WS, cU, p.cI)
case slot.EXPR0R1: // EXPR : WS ∙SUM
if !p.testSelect(slot.EXPR0R1) {
p.parseError(slot.EXPR0R1, p.cI, first[slot.EXPR0R1])
L, p.cI = slot.EXPR1F0, cU
goto nextSlot
}
p.call(slot.EXPR0R2, slot.EXPR1F0, symbols.NT_SUM, cU, p.cI)
case slot.EXPR0R2: // EXPR : WS SUM ∙
p.rtn(symbols.NT_EXPR, cU, p.cI)
case slot.EXPR1F0: // EXPR failure case
p.rtn(symbols.NT_EXPR, cU, failInd)
case slot.MINUS0R0: // MINUS : ∙- WS
if !p.testSelect(slot.MINUS0R0) {
p.parseError(slot.MINUS0R0, p.cI, first[slot.MINUS0R0])
L, p.cI = slot.MINUS1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.MINUS0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.MINUS0R1) {
p.parseError(slot.MINUS0R1, p.cI, first[slot.MINUS0R1])
L, p.cI = slot.MINUS1F0, cU
goto nextSlot
}
p.call(slot.MINUS0R2, slot.MINUS1F0, symbols.NT_WS, cU, p.cI)
case slot.MINUS0R2: // MINUS : - WS ∙
p.rtn(symbols.NT_MINUS, cU, p.cI)
case slot.MINUS1F0: // MINUS failure case
p.rtn(symbols.NT_MINUS, cU, failInd)
case slot.Number0R0: // Number : ∙repNumber1x WS
if !p.testSelect(slot.Number0R0) {
p.parseError(slot.Number0R0, p.cI, first[slot.Number0R0])
L, p.cI = slot.Number1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.Number0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.Number0R1) {
p.parseError(slot.Number0R1, p.cI, first[slot.Number0R1])
L, p.cI = slot.Number1F0, cU
goto nextSlot
}
p.call(slot.Number0R2, slot.Number1F0, symbols.NT_WS, cU, p.cI)
case slot.Number0R2: // Number : repNumber1x WS ∙
p.rtn(symbols.NT_Number, cU, p.cI)
case slot.Number1F0: // Number failure case
p.rtn(symbols.NT_Number, cU, failInd)
case slot.OPEN0R0: // OPEN : ∙( WS
if !p.testSelect(slot.OPEN0R0) {
p.parseError(slot.OPEN0R0, p.cI, first[slot.OPEN0R0])
L, p.cI = slot.OPEN1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.OPEN0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.OPEN0R1) {
p.parseError(slot.OPEN0R1, p.cI, first[slot.OPEN0R1])
L, p.cI = slot.OPEN1F0, cU
goto nextSlot
}
p.call(slot.OPEN0R2, slot.OPEN1F0, symbols.NT_WS, cU, p.cI)
case slot.OPEN0R2: // OPEN : ( WS ∙
p.rtn(symbols.NT_OPEN, cU, p.cI)
case slot.OPEN1F0: // OPEN failure case
p.rtn(symbols.NT_OPEN, cU, failInd)
case slot.PLUS0R0: // PLUS : ∙+ WS
if !p.testSelect(slot.PLUS0R0) {
p.parseError(slot.PLUS0R0, p.cI, first[slot.PLUS0R0])
L, p.cI = slot.PLUS1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.PLUS0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.PLUS0R1) {
p.parseError(slot.PLUS0R1, p.cI, first[slot.PLUS0R1])
L, p.cI = slot.PLUS1F0, cU
goto nextSlot
}
p.call(slot.PLUS0R2, slot.PLUS1F0, symbols.NT_WS, cU, p.cI)
case slot.PLUS0R2: // PLUS : + WS ∙
p.rtn(symbols.NT_PLUS, cU, p.cI)
case slot.PLUS1F0: // PLUS failure case
p.rtn(symbols.NT_PLUS, cU, failInd)
case slot.PLUSorMINUS0R0: // PLUSorMINUS : ∙PLUS PRODUCT
if !p.testSelect(slot.PLUSorMINUS0R0) {
p.parseError(slot.PLUSorMINUS0R0, p.cI, first[slot.PLUSorMINUS0R0])
L, p.cI = slot.PLUSorMINUS1R0, cU
goto nextSlot
}
p.call(slot.PLUSorMINUS0R1, slot.PLUSorMINUS1R0, symbols.NT_PLUS, cU, p.cI)
case slot.PLUSorMINUS0R1: // PLUSorMINUS : PLUS ∙PRODUCT
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
L, p.cI = slot.PLUSorMINUS1M0, cU
goto nextSlot
if !p.testSelect(slot.PLUSorMINUS0R1) {
p.parseError(slot.PLUSorMINUS0R1, p.cI, first[slot.PLUSorMINUS0R1])
L, p.cI = slot.PLUSorMINUS1R0, cU
goto nextSlot
}
p.call(slot.PLUSorMINUS0R2, slot.PLUSorMINUS1R0, symbols.NT_PRODUCT, cU, p.cI)
case slot.PLUSorMINUS0R2: // PLUSorMINUS : PLUS PRODUCT ∙
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
L, p.cI = slot.PLUSorMINUS1M0, cU
goto nextSlot
case slot.PLUSorMINUS1R0: // PLUSorMINUS : ∙MINUS PRODUCT
if !p.testSelect(slot.PLUSorMINUS1R0) {
p.parseError(slot.PLUSorMINUS1R0, p.cI, first[slot.PLUSorMINUS1R0])
L, p.cI = slot.PLUSorMINUS2F0, cU
goto nextSlot
}
p.call(slot.PLUSorMINUS1R1, slot.PLUSorMINUS2F0, symbols.NT_MINUS, cU, p.cI)
case slot.PLUSorMINUS1R1: // PLUSorMINUS : MINUS ∙PRODUCT
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
if !p.testSelect(slot.PLUSorMINUS1R1) {
p.parseError(slot.PLUSorMINUS1R1, p.cI, first[slot.PLUSorMINUS1R1])
L, p.cI = slot.PLUSorMINUS2F0, cU
goto nextSlot
}
p.call(slot.PLUSorMINUS1R2, slot.PLUSorMINUS2F0, symbols.NT_PRODUCT, cU, p.cI)
case slot.PLUSorMINUS1R2: // PLUSorMINUS : MINUS PRODUCT ∙
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
case slot.PLUSorMINUS1M0: // PLUSorMINUS : ∙MINUS PRODUCT [with previous match]
if !p.testSelect(slot.PLUSorMINUS1R0) {
p.parseError(slot.PLUSorMINUS1R0, p.cI, first[slot.PLUSorMINUS1R0])
}
p.call(slot.PLUSorMINUS1M0, failInd, symbols.NT_MINUS, cU, p.cI)
case slot.PLUSorMINUS1M0: // PLUSorMINUS : MINUS ∙PRODUCT
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
if !p.testSelect(slot.PLUSorMINUS1R1) {
p.parseError(slot.PLUSorMINUS1R1, p.cI, first[slot.PLUSorMINUS1R1])
}
p.call(slot.PLUSorMINUS1M1, failInd, symbols.NT_PRODUCT, cU, p.cI)
case slot.PLUSorMINUS1M1: // PLUSorMINUS : MINUS PRODUCT ∙
p.rtn(symbols.NT_PLUSorMINUS, cU, p.cI)
case slot.PLUSorMINUS2F0: // PLUSorMINUS failure case
p.rtn(symbols.NT_PLUSorMINUS, cU, failInd)
case slot.PRODUCT0R0: // PRODUCT : ∙ELEMENT SuffTIMESorDIVIDE
if !p.testSelect(slot.PRODUCT0R0) {
p.parseError(slot.PRODUCT0R0, p.cI, first[slot.PRODUCT0R0])
L, p.cI = slot.PRODUCT1F0, cU
goto nextSlot
}
p.call(slot.PRODUCT0R1, slot.PRODUCT1F0, symbols.NT_ELEMENT, cU, p.cI)
case slot.PRODUCT0R1: // PRODUCT : ELEMENT ∙SuffTIMESorDIVIDE
if !p.testSelect(slot.PRODUCT0R1) {
p.parseError(slot.PRODUCT0R1, p.cI, first[slot.PRODUCT0R1])
L, p.cI = slot.PRODUCT1F0, cU
goto nextSlot
}
p.call(slot.PRODUCT0R2, slot.PRODUCT1F0, symbols.NT_SuffTIMESorDIVIDE, cU, p.cI)
case slot.PRODUCT0R2: // PRODUCT : ELEMENT SuffTIMESorDIVIDE ∙
p.rtn(symbols.NT_PRODUCT, cU, p.cI)
case slot.PRODUCT1F0: // PRODUCT failure case
p.rtn(symbols.NT_PRODUCT, cU, failInd)
case slot.SUM0R0: // SUM : ∙PRODUCT SuffPLUSorMINUS
if !p.testSelect(slot.SUM0R0) {
p.parseError(slot.SUM0R0, p.cI, first[slot.SUM0R0])
L, p.cI = slot.SUM1F0, cU
goto nextSlot
}
p.call(slot.SUM0R1, slot.SUM1F0, symbols.NT_PRODUCT, cU, p.cI)
case slot.SUM0R1: // SUM : PRODUCT ∙SuffPLUSorMINUS
if !p.testSelect(slot.SUM0R1) {
p.parseError(slot.SUM0R1, p.cI, first[slot.SUM0R1])
L, p.cI = slot.SUM1F0, cU
goto nextSlot
}
p.call(slot.SUM0R2, slot.SUM1F0, symbols.NT_SuffPLUSorMINUS, cU, p.cI)
case slot.SUM0R2: // SUM : PRODUCT SuffPLUSorMINUS ∙
p.rtn(symbols.NT_SUM, cU, p.cI)
case slot.SUM1F0: // SUM failure case
p.rtn(symbols.NT_SUM, cU, failInd)
case slot.SuffPLUSorMINUS0R0: // SuffPLUSorMINUS : ∙PLUSorMINUS SuffPLUSorMINUS
if !p.testSelect(slot.SuffPLUSorMINUS0R0) {
p.parseError(slot.SuffPLUSorMINUS0R0, p.cI, first[slot.SuffPLUSorMINUS0R0])
L, p.cI = slot.SuffPLUSorMINUS1R0, cU
goto nextSlot
}
p.call(slot.SuffPLUSorMINUS0R1, slot.SuffPLUSorMINUS1R0, symbols.NT_PLUSorMINUS, cU, p.cI)
case slot.SuffPLUSorMINUS0R1: // SuffPLUSorMINUS : PLUSorMINUS ∙SuffPLUSorMINUS
if !p.testSelect(slot.SuffPLUSorMINUS0R1) {
p.parseError(slot.SuffPLUSorMINUS0R1, p.cI, first[slot.SuffPLUSorMINUS0R1])
L, p.cI = slot.SuffPLUSorMINUS1R0, cU
goto nextSlot
}
p.call(slot.SuffPLUSorMINUS0R2, slot.SuffPLUSorMINUS1R0, symbols.NT_SuffPLUSorMINUS, cU, p.cI)
case slot.SuffPLUSorMINUS0R2: // SuffPLUSorMINUS : PLUSorMINUS SuffPLUSorMINUS ∙
p.rtn(symbols.NT_SuffPLUSorMINUS, cU, p.cI)
case slot.SuffPLUSorMINUS1R0: // SuffPLUSorMINUS : ∙
p.bsrSet.AddEmpty(slot.SuffPLUSorMINUS1R0, p.cI)
p.rtn(symbols.NT_SuffPLUSorMINUS, cU, p.cI)
case slot.SuffTIMESorDIVIDE0R0: // SuffTIMESorDIVIDE : ∙TIMESorDIVIDE SuffTIMESorDIVIDE
if !p.testSelect(slot.SuffTIMESorDIVIDE0R0) {
p.parseError(slot.SuffTIMESorDIVIDE0R0, p.cI, first[slot.SuffTIMESorDIVIDE0R0])
L, p.cI = slot.SuffTIMESorDIVIDE1R0, cU
goto nextSlot
}
p.call(slot.SuffTIMESorDIVIDE0R1, slot.SuffTIMESorDIVIDE1R0, symbols.NT_TIMESorDIVIDE, cU, p.cI)
case slot.SuffTIMESorDIVIDE0R1: // SuffTIMESorDIVIDE : TIMESorDIVIDE ∙SuffTIMESorDIVIDE
if !p.testSelect(slot.SuffTIMESorDIVIDE0R1) {
p.parseError(slot.SuffTIMESorDIVIDE0R1, p.cI, first[slot.SuffTIMESorDIVIDE0R1])
L, p.cI = slot.SuffTIMESorDIVIDE1R0, cU
goto nextSlot
}
p.call(slot.SuffTIMESorDIVIDE0R2, slot.SuffTIMESorDIVIDE1R0, symbols.NT_SuffTIMESorDIVIDE, cU, p.cI)
case slot.SuffTIMESorDIVIDE0R2: // SuffTIMESorDIVIDE : TIMESorDIVIDE SuffTIMESorDIVIDE ∙
p.rtn(symbols.NT_SuffTIMESorDIVIDE, cU, p.cI)
case slot.SuffTIMESorDIVIDE1R0: // SuffTIMESorDIVIDE : ∙
p.bsrSet.AddEmpty(slot.SuffTIMESorDIVIDE1R0, p.cI)
p.rtn(symbols.NT_SuffTIMESorDIVIDE, cU, p.cI)
case slot.TIMES0R0: // TIMES : ∙* WS
if !p.testSelect(slot.TIMES0R0) {
p.parseError(slot.TIMES0R0, p.cI, first[slot.TIMES0R0])
L, p.cI = slot.TIMES1F0, cU
goto nextSlot
}
p.bsrSet.Add(slot.TIMES0R1, cU, p.cI, p.cI+1)
p.cI++
if !p.testSelect(slot.TIMES0R1) {
p.parseError(slot.TIMES0R1, p.cI, first[slot.TIMES0R1])
L, p.cI = slot.TIMES1F0, cU
goto nextSlot
}
p.call(slot.TIMES0R2, slot.TIMES1F0, symbols.NT_WS, cU, p.cI)
case slot.TIMES0R2: // TIMES : * WS ∙
p.rtn(symbols.NT_TIMES, cU, p.cI)
case slot.TIMES1F0: // TIMES failure case
p.rtn(symbols.NT_TIMES, cU, failInd)
case slot.TIMESorDIVIDE0R0: // TIMESorDIVIDE : ∙TIMES ELEMENT
if !p.testSelect(slot.TIMESorDIVIDE0R0) {
p.parseError(slot.TIMESorDIVIDE0R0, p.cI, first[slot.TIMESorDIVIDE0R0])
L, p.cI = slot.TIMESorDIVIDE1R0, cU
goto nextSlot
}
p.call(slot.TIMESorDIVIDE0R1, slot.TIMESorDIVIDE1R0, symbols.NT_TIMES, cU, p.cI)
case slot.TIMESorDIVIDE0R1: // TIMESorDIVIDE : TIMES ∙ELEMENT
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
L, p.cI = slot.TIMESorDIVIDE1M0, cU
goto nextSlot
if !p.testSelect(slot.TIMESorDIVIDE0R1) {
p.parseError(slot.TIMESorDIVIDE0R1, p.cI, first[slot.TIMESorDIVIDE0R1])
L, p.cI = slot.TIMESorDIVIDE1R0, cU
goto nextSlot
}
p.call(slot.TIMESorDIVIDE0R2, slot.TIMESorDIVIDE1R0, symbols.NT_ELEMENT, cU, p.cI)
case slot.TIMESorDIVIDE0R2: // TIMESorDIVIDE : TIMES ELEMENT ∙
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
L, p.cI = slot.TIMESorDIVIDE1M0, cU
goto nextSlot
case slot.TIMESorDIVIDE1R0: // TIMESorDIVIDE : ∙DIVIDE ELEMENT
if !p.testSelect(slot.TIMESorDIVIDE1R0) {
p.parseError(slot.TIMESorDIVIDE1R0, p.cI, first[slot.TIMESorDIVIDE1R0])
L, p.cI = slot.TIMESorDIVIDE2F0, cU
goto nextSlot
}
p.call(slot.TIMESorDIVIDE1R1, slot.TIMESorDIVIDE2F0, symbols.NT_DIVIDE, cU, p.cI)
case slot.TIMESorDIVIDE1R1: // TIMESorDIVIDE : DIVIDE ∙ELEMENT
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
if !p.testSelect(slot.TIMESorDIVIDE1R1) {
p.parseError(slot.TIMESorDIVIDE1R1, p.cI, first[slot.TIMESorDIVIDE1R1])
L, p.cI = slot.TIMESorDIVIDE2F0, cU
goto nextSlot
}
p.call(slot.TIMESorDIVIDE1R2, slot.TIMESorDIVIDE2F0, symbols.NT_ELEMENT, cU, p.cI)
case slot.TIMESorDIVIDE1R2: // TIMESorDIVIDE : DIVIDE ELEMENT ∙
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
case slot.TIMESorDIVIDE1M0: // TIMESorDIVIDE : ∙DIVIDE ELEMENT [with previous match]
if !p.testSelect(slot.TIMESorDIVIDE1R0) {
p.parseError(slot.TIMESorDIVIDE1R0, p.cI, first[slot.TIMESorDIVIDE1R0])
}
p.call(slot.TIMESorDIVIDE1M0, failInd, symbols.NT_DIVIDE, cU, p.cI)
case slot.TIMESorDIVIDE1M0: // TIMESorDIVIDE : DIVIDE ∙ELEMENT
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
if !p.testSelect(slot.TIMESorDIVIDE1R1) {
p.parseError(slot.TIMESorDIVIDE1R1, p.cI, first[slot.TIMESorDIVIDE1R1])
}
p.call(slot.TIMESorDIVIDE1M1, failInd, symbols.NT_ELEMENT, cU, p.cI)
case slot.TIMESorDIVIDE1M1: // TIMESorDIVIDE : DIVIDE ELEMENT ∙
p.rtn(symbols.NT_TIMESorDIVIDE, cU, p.cI)
case slot.TIMESorDIVIDE2F0: // TIMESorDIVIDE failure case
p.rtn(symbols.NT_TIMESorDIVIDE, cU, failInd)
case slot.WS0R0: // WS : ∙sp
if !p.testSelect(slot.WS0R0) {
p.parseError(slot.WS0R0, p.cI, first[slot.WS0R0])
L, p.cI = slot.WS1R0, cU
goto nextSlot
}
p.bsrSet.Add(slot.WS0R1, cU, p.cI, p.cI+1)
p.cI++
p.rtn(symbols.NT_WS, cU, p.cI)
case slot.WS1R0: // WS : ∙
p.bsrSet.AddEmpty(slot.WS1R0, p.cI)
p.rtn(symbols.NT_WS, cU, p.cI)
default:
panic("This must not happen")
}
// if exit switch normally, also exit loop and proceed to next
// descriptor; if exit with goto nextSlot, repeat switch at next
// slot
break
nextSlot:
}
}
if !p.bsrSet.Contain(symbols.NT_EXPR, 0, m) {
p.sortParseErrors()
return nil, p.parseErrors
}
return p.bsrSet, nil
}
func (p *parser) ntAdd(nt symbols.NT, j int) {
l := slot.GetAlternates(nt)[0]
p.dscAdd(l, j, j)
}
/*** 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
}
func (p *parser) call(Lm, Lf slot.Label, X symbols.NT, i, j int) {
// fmt.Printf("p.call(%s,%d,%d)\n", L,i,j)
um, exist := p.crfNodes[crfNode{Lm, i}]
// fmt.Printf(" u exist=%t\n", exist)
if !exist {
um = &crfNode{Lm, i}
p.crfNodes[*um] = um
}
uf, exist := p.crfNodes[crfNode{Lf, i}]
if !exist {
uf = &crfNode{Lf, i}
p.crfNodes[*uf] = uf
}
ndV := clusterNode{X, j}
vm, existm := p.crf_m[ndV]
vf, existf := p.crf_f[ndV]
if !existm && !existf {
// fmt.Println(" v !exist")
p.crf_m[ndV] = []*crfNode{um}
p.crf_f[ndV] = []*crfNode{uf}
p.ntAdd(X, j)
} else {
// fmt.Println(" v exist")
if !existEdge(vm, um) {
// fmt.Printf(" !existEdge(%v)\n", u)
p.crf_m[ndV] = append(vm, um)
// fmt.Printf("|popped|=%d\n", len(popped))
for pnd := range p.popped {
if pnd.X == X && pnd.k == j && pnd.j != failInd {
p.addMatch(Lm, i, j, pnd.j)
}
}
}
if !existEdge(vf, uf) {
p.crf_f[ndV] = append(vf, uf)
for pnd := range p.popped {
if pnd.X == X && pnd.k == j && pnd.j == failInd {
p.addFail(Lf, i, 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
if j != failInd {
for _, nd := range p.crf_m[clusterNode{X, k}] {
p.addMatch(nd.L, nd.i, k, j)
}
} else {
for _, nd := range p.crf_f[clusterNode{X, k}] {
p.addFail(nd.L, nd.i, k)
}
}
}
}
func (p *parser) addMatch(L slot.Label, i, k, j int) {
p.bsrSet.Add(L, i, k, j)
if L.IsLookahead() {
p.dscAdd(L, i, k)
} else {
p.dscAdd(L, i, j)
}
}
func (p *parser) addFail(L slot.Label, i, k int) {
if L.IsLookahead() {
p.dscAdd(L, i, k)
} else {
p.dscAdd(L, i, i)
}
}
// 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{
// CLOSE : ∙) WS
{
token.T_1: ")",
},
// CLOSE : ) ∙WS
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
token.T_7: "sp",
},
// CLOSE : ) WS ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// CLOSE : ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// DIVIDE : ∙/ WS
{
token.T_5: "/",
},
// DIVIDE : / ∙WS
{
token.T_0: "(",
token.T_6: "repNumber1x",
token.T_7: "sp",
},
// DIVIDE : / WS ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// DIVIDE : ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// ELEMENT : ∙OPEN SUM CLOSE
{
token.T_0: "(",
},
// ELEMENT : OPEN ∙SUM CLOSE
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// ELEMENT : OPEN SUM ∙CLOSE
{
token.T_1: ")",
},
// ELEMENT : OPEN SUM CLOSE ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// ELEMENT : ∙Number
{
token.T_6: "repNumber1x",
},
// ELEMENT : ∙Number
{
token.T_6: "repNumber1x",
},
// ELEMENT : Number ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// ELEMENT : Number ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// ELEMENT : ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// EXPR : ∙WS SUM
{
token.T_0: "(",
token.T_6: "repNumber1x",
token.T_7: "sp",
},
// EXPR : WS ∙SUM
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// EXPR : WS SUM ∙
{
token.EOF: "$",
},
// EXPR : ∙
{
token.EOF: "$",
},
// MINUS : ∙- WS
{
token.T_4: "-",
},
// MINUS : - ∙WS
{
token.T_0: "(",
token.T_6: "repNumber1x",
token.T_7: "sp",
},
// MINUS : - WS ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// MINUS : ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// Number : ∙repNumber1x WS
{
token.T_6: "repNumber1x",
},
// Number : repNumber1x ∙WS
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
token.T_7: "sp",
},
// Number : repNumber1x WS ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// Number : ∙
{
token.EOF: "$",
token.T_1: ")",
token.T_2: "*",
token.T_3: "+",
token.T_4: "-",
token.T_5: "/",
},
// OPEN : ∙( WS
{
token.T_0: "(",
},
// OPEN : ( ∙WS
{
token.T_0: "(",
token.T_6: "repNumber1x",
token.T_7: "sp",
},
// OPEN : ( WS ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// OPEN : ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// PLUS : ∙+ WS
{
token.T_3: "+",
},
// PLUS : + ∙WS
{
token.T_0: "(",
token.T_6: "repNumber1x",
token.T_7: "sp",
},
// PLUS : + WS ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",
},
// PLUS : ∙
{
token.T_0: "(",
token.T_6: "repNumber1x",