// lexInside lexes the content inside a query block.
func lexInside(l *lex.Lexer) lex.StateFn {
for {
switch r := l.Next(); {
case r == period:
if l.Next() == period && l.Next() == period {
return lexFragmentSpread
}
// We do not expect a period at all. If you do, you may want to
// backup the two extra periods we try to read.
return l.Errorf("Unrecognized character in lexInside: %#U", r)
case r == rightCurl:
l.Depth--
l.Emit(itemRightCurl)
if l.Depth == 0 {
return lexText
}
case r == leftCurl:
l.Depth++
l.Emit(itemLeftCurl)
case r == lex.EOF:
return l.Errorf("Unclosed action")
case isSpace(r) || isEndOfLine(r) || r == comma:
l.Ignore()
case isNameBegin(r):
return lexName
case r == '#':
l.Backup()
return lexComment
case r == leftRound:
l.Emit(itemLeftRound)
l.AcceptRun(isSpace)
l.Ignore()
k := l.Next()
if k == '_' || l.Depth != 1 || l.Mode == fragmentMode {
l.Backup()
l.Emit(itemArgument)
return lexArgInside
}
// This is a generator function.
l.Backup()
l.Emit(itemGenerator)
l.FilterDepth++
return lexFilterInside
case r == ':':
return lexAlias
case r == '@':
return lexDirective
default:
return l.Errorf("Unrecognized character in lexInside: %#U", r)
}
}
}
func lexAlias(l *lex.Lexer) lex.StateFn {
l.AcceptRun(isSpace)
l.Ignore() // Any spaces encountered.
for {
r := l.Next()
if isNameSuffix(r) {
continue
}
l.Backup()
l.Emit(itemAlias)
break
}
return lexInside
}
func lexLanguage(l *lex.Lexer) lex.StateFn {
r := l.Next()
if r != '@' {
return l.Errorf("Expected @ prefix for lexLanguage")
}
l.Ignore()
r = l.Next()
if !isLangTagPrefix(r) {
return l.Errorf("Invalid language tag prefix: %v", r)
}
l.AcceptRun(isLangTag)
l.Emit(itemLanguage)
return lexText
}
// lexArgVal lexes and emits the value part of an argument.
func lexArgVal(l *lex.Lexer) lex.StateFn {
l.AcceptRun(isSpace)
l.Ignore() // Any spaces encountered.
for {
r := l.Next()
if isSpace(r) || isEndOfLine(r) || r == rightRound || r == comma {
l.Backup()
l.Emit(itemArgVal)
return lexArgInside
}
if r == lex.EOF {
return l.Errorf("Reached lex.EOF while reading var value: %v",
l.Input[l.Start:l.Pos])
}
}
}
func lexArgVal(l *lex.Lexer) lex.StateFn {
l.AcceptRun(isSpace)
l.Ignore() // Any spaces encountered.
for {
r := l.Next()
if isSpace(r) || isEndOfLine(r) || r == ')' || r == ',' {
l.Backup()
l.Emit(itemArgVal)
return lexArgInside
}
if r == lex.EOF {
return l.Errorf("Reached lex.EOF while reading var value: %v",
l.Input[l.Start:l.Pos])
}
}
glog.Fatal("This shouldn't be reached.")
return nil
}
// lexFilterFuncInside expects input to look like ("...", "...").
func lexFilterFuncInside(l *lex.Lexer) lex.StateFn {
l.AcceptRun(isSpace)
l.Ignore() // Any spaces encountered.
for {
r := l.Next()
if isSpace(r) || r == ',' {
l.Ignore()
} else if r == leftRound {
l.Emit(itemLeftRound)
} else if r == rightRound {
l.Emit(itemRightRound)
return lexFilterInside
} else if isEndLiteral(r) {
l.Ignore()
l.AcceptUntil(isEndLiteral) // This call will backup the ending ".
l.Emit(itemFilterFuncArg)
l.Next() // Consume " and ignore it.
l.Ignore()
} else {
return l.Errorf("Expected quotation mark in lexFilterFuncArgs")
}
}
}
