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statefns.go
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/
statefns.go
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package gon3
import (
"github.com/rychipman/easylex"
"strings"
)
const (
eof = -1
)
func lexDocument(l *easylex.Lexer) easylex.StateFn {
matchWhitespace.MatchRun(l)
l.Ignore()
switch l.Peek() {
case easylex.EOF:
l.Emit(easylex.TokenEOF)
return nil
case '#':
return lexComment
case '@':
return lexAtStatement
case '_':
return lexBlankNodeLabel
case '<':
return lexIRIRef
case '"', '\'':
return lexRDFLiteral
case '.':
if matchBareDecimalStart.Peek(l) {
return lexNumericLiteral
}
return lexPunctuation
case '+', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
return lexNumericLiteral
case '[':
// anon
l.Next()
matchWhitespace.MatchRun(l)
if matchCloseBracket.MatchOne(l) {
l.Emit(tokenAnon)
return lexDocument
}
l.Emit(tokenStartBlankNodePropertyList)
return lexDocument
case '^', ']', '(', ')', ';', ',':
return lexPunctuation
case 't', 'f', 'a', 'b', 'B', 'p', 'P':
if matchTrue.MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenTrue)
return lexDocument
}
}
if matchFalse.MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenFalse)
return lexDocument
}
}
if matchA.MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenA)
return lexDocument
}
}
if matchSPARQLBase.MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenSPARQLBase)
return lexDocument
}
}
if matchSPARQLPrefix.MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenSPARQLPrefix)
return lexDocument
}
}
fallthrough
default:
return lexPName
}
panic("unreachable")
}
func isWhitespace(r rune) bool {
if strings.IndexRune("\n\r\t\v\f ", r) >= 0 {
return true
}
return false
}
func lexComment(l *easylex.Lexer) easylex.StateFn {
easylex.NewMatcher().AcceptRunes("#").AssertOne(l, "Expected '#' while lexing comment")
easylex.NewMatcher().RejectRunes("\n").MatchRun(l)
l.Ignore()
return lexDocument
}
func lexAtStatement(l *easylex.Lexer) easylex.StateFn {
easylex.NewMatcher().AcceptRunes("@").AssertOne(l, "Expected '@' while lexing AtStatement")
if easylex.NewMatcher().AcceptString("prefix").MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenAtPrefix)
return lexDocument
}
}
if easylex.NewMatcher().AcceptString("base").MatchOne(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenAtBase)
return lexDocument
}
}
matchAlphabet.AssertRun(l, "Expected alphabet while lexing AtStatement")
for {
hyphen := easylex.NewMatcher().AcceptRunes("-").MatchOne(l)
alph := matchAlphaNumeric.MatchRun(l)
if !hyphen && !alph {
break
}
if hyphen != alph {
// TODO: error
}
}
l.Emit(tokenLangTag)
return lexDocument
}
func lexBlankNodeLabel(l *easylex.Lexer) easylex.StateFn {
easylex.NewMatcher().AcceptRunes("_").AssertOne(l, "Expected '_' while lexing bnode label")
easylex.NewMatcher().AcceptRunes(":").AssertOne(l, "Expected ':' while lexing bnode label")
easylex.NewMatcher().Union(matchPNCharsU).Union(matchDigits).AssertOne(l, "Expected pncharsu or digit while lexing bnode label")
easylex.NewMatcher().Union(matchPNChars).AcceptRunes(".").MatchLookAheadRun(l, easylex.NewMatcher().Union(matchPNChars).AcceptRunes("."))
matchPNChars.MatchRun(l)
l.Emit(tokenBlankNodeLabel)
return lexDocument
}
func lexIRIRef(l *easylex.Lexer) easylex.StateFn {
easylex.NewMatcher().AcceptRunes("<").AssertOne(l, "Expected '<' while lexing iriref")
iriChars := easylex.NewMatcher().RejectRunes("<>\"{}|^`\\\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\u0008\u0009\u000a\u000b\u000c\u000d\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f\u0020")
for {
m1 := iriChars.MatchRun(l)
if l.Peek() == '\\' {
l.Next()
if l.Peek() == 'u' {
l.Next()
for i := 0; i < 4; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing iriref")
}
} else if l.Peek() == 'U' {
l.Next()
for i := 0; i < 8; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing iriref")
}
} else {
// TODO: error
}
} else if !m1 {
break
}
}
easylex.NewMatcher().AcceptRunes(">").AssertOne(l, "Expected '>' while lexing iriref")
l.Emit(tokenIRIRef)
return lexDocument
}
func lexRDFLiteral(l *easylex.Lexer) easylex.StateFn {
if matchLongQuote.MatchOne(l) {
for {
if matchLongQuote.MatchOne(l) {
break
}
q := matchQuote.MatchOne(l)
q = matchQuote.MatchOne(l) || q
ch := true
if easylex.NewMatcher().RejectRunes(`"\`).MatchOne(l) {
// do nothing
} else if l.Peek() == '\\' {
l.Next()
switch l.Peek() {
case 'u':
l.Next()
for i := 0; i < 4; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 'U':
l.Next()
for i := 0; i < 8; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 't', 'b', 'n', 'r', 'f', '"', '\'', '\\':
l.Next()
default:
ch = false
}
}
if q && !ch {
// TODO: error
}
}
l.Emit(tokenStringLiteralLongQuote)
return lexDocument
}
if matchLongSingleQuote.MatchOne(l) {
for {
if matchLongSingleQuote.MatchOne(l) {
break
}
q := matchSingleQuote.MatchOne(l)
q = matchSingleQuote.MatchOne(l) || q
ch := true
if easylex.NewMatcher().RejectRunes(`'\`).MatchOne(l) {
// do nothing
} else if l.Peek() == '\\' {
l.Next()
switch l.Peek() {
case 'u':
l.Next()
for i := 0; i < 4; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 'U':
l.Next()
for i := 0; i < 8; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 't', 'b', 'n', 'r', 'f', '"', '\'', '\\':
l.Next()
default:
ch = false
}
}
if !q && !ch {
break
}
}
l.Emit(tokenStringLiteralLongSingleQuote)
return lexDocument
}
if matchQuote.MatchOne(l) {
for {
if easylex.NewMatcher().RejectRunes("\u0022\u005c\u000a\u000d").MatchOne(l) {
// do nothing
} else if l.Peek() == '\\' {
l.Next()
switch l.Peek() {
case 'u':
l.Next()
for i := 0; i < 4; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 'U':
l.Next()
for i := 0; i < 8; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 't', 'b', 'n', 'r', 'f', '"', '\'', '\\':
l.Next()
default:
break
}
} else {
break
}
}
matchQuote.AssertOne(l, "Expected '\"' while lexing RDF Literal")
l.Emit(tokenStringLiteralQuote)
return lexDocument
}
if matchSingleQuote.MatchOne(l) {
for {
if easylex.NewMatcher().RejectRunes("\u0027\u005c\u000a\u000d").MatchOne(l) {
// do nothing
} else if l.Peek() == '\\' {
l.Next()
switch l.Peek() {
case 'u':
l.Next()
for i := 0; i < 4; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 'U':
l.Next()
for i := 0; i < 8; i += 1 {
matchHex.AssertOne(l, "Expected hex digit while lexing RDF Literal")
}
case 't', 'b', 'n', 'r', 'f', '"', '\'', '\\':
l.Next()
default:
break
}
} else {
break
}
}
matchSingleQuote.AssertOne(l, "Expected \"'\" while lexing RDF Literal")
l.Emit(tokenStringLiteralSingleQuote)
return lexDocument
}
panic("unreachable")
}
func lexNumericLiteral(l *easylex.Lexer) easylex.StateFn {
easylex.NewMatcher().AcceptRunes("+-").MatchOne(l)
if matchDigits.MatchRun(l) {
if easylex.NewMatcher().AcceptRunes("eE").MatchOne(l) {
easylex.NewMatcher().AcceptRunes("+-").MatchOne(l)
matchDigits.AssertRun(l, "Expected digits while lexing numeric literal")
l.Emit(tokenDouble)
return lexDocument
} else if matchPeriod.MatchLookAhead(l, easylex.NewMatcher().AcceptRunes("0123456789eE")) {
if matchDigits.MatchRun(l) {
if isWhitespace(l.Peek()) {
l.Emit(tokenDecimal)
return lexDocument
}
}
easylex.NewMatcher().AcceptRunes("eE").AssertOne(l, "Expected 'e' or 'E' while lexing numeric literal")
easylex.NewMatcher().AcceptRunes("+-").MatchOne(l)
matchDigits.AssertRun(l, "Expected digits while lexing numeric literal")
l.Emit(tokenDouble)
return lexDocument
} else {
l.Emit(tokenInteger)
return lexDocument
}
} else {
matchPeriod.AssertOne(l, "Expected '.' while lexing numeric literal")
matchDigits.AssertRun(l, "Expected digits while lexing numeric literal")
if easylex.NewMatcher().AcceptRunes("eE").MatchOne(l) {
easylex.NewMatcher().AcceptRunes("+-").MatchOne(l)
matchDigits.AssertRun(l, "Expected digits while lexing numeric literal")
l.Emit(tokenDouble)
return lexDocument
}
l.Emit(tokenDecimal)
return lexDocument
}
}
func lexPunctuation(l *easylex.Lexer) easylex.StateFn {
// ^ ] ( ) ; , .
if matchDoubleCaret.MatchOne(l) {
l.Emit(tokenLiteralDatatypeTag)
} else if matchCloseBracket.MatchOne(l) {
l.Emit(tokenEndBlankNodePropertyList)
} else if matchOpenParens.MatchOne(l) {
l.Emit(tokenStartCollection)
} else if matchCloseParens.MatchOne(l) {
l.Emit(tokenEndCollection)
} else if matchSemicolon.MatchOne(l) {
l.Emit(tokenPredicateListSeparator)
} else if matchComma.MatchOne(l) {
l.Emit(tokenObjectListSeparator)
} else if matchPeriod.MatchOne(l) {
l.Emit(tokenEndTriples)
} else {
// TODO: error
}
return lexDocument
}
func lexPName(l *easylex.Lexer) easylex.StateFn {
// accept PN_PREFIX
matchPNCharsBase.MatchOne(l)
for {
period := matchPeriod.MatchRun(l)
pnchars := matchPNChars.MatchRun(l)
if !pnchars {
if period {
// TODO: error
}
break
}
}
easylex.NewMatcher().AcceptRunes(":").AssertOne(l, "Expected ':' while lexing pname")
// TODO: get exhaustive list of "end" chars
// TODO: factor this out into a matcher
if easylex.NewMatcher().AcceptRunes("\n\r\t\v\f ;,.#").Peek(l) {
l.Emit(tokenPNameNS)
return lexDocument
}
// accept PN_LOCAL
if l.Peek() == '\\' {
l.Next()
matchEscapable.AssertOne(l, "Expected escapable while lexing pname")
} else if l.Peek() == '%' {
l.Next()
matchHex.AssertOne(l, "Expected hex digit while lexing pname")
matchHex.AssertOne(l, "Expected hex digit while lexing pname")
} else {
easylex.NewMatcher().AcceptRunes(":").Union(matchPNCharsU).Union(matchDigits).AssertOne(l, "Expected ':', pncharsu, or digits while lexing pname")
}
for {
m := easylex.NewMatcher().Union(matchPNChars).AcceptRunes(".:").MatchLookAheadRun(l, easylex.NewMatcher().Union(matchPNChars).AcceptRunes(`.:\%`))
for {
switch l.Peek() {
case '\\':
l.Next()
matchEscapable.AssertOne(l, "Expected escapable while lexing pname")
continue
case '%':
l.Next()
matchHex.AssertOne(l, "Expected hex digit while lexing pname")
matchHex.AssertOne(l, "Expected hex digit while lexing pname")
continue
}
break
}
if !m {
break
}
}
easylex.NewMatcher().Union(matchPNChars).AcceptRunes(":").MatchRun(l)
l.Emit(tokenPNameLN)
return lexDocument
}