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delimit.go
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delimit.go
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/*
Copyright 2021 The ANTLR Project
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Copyright (c) 2012-2017 The ANTLR Project. All rights reserved. Use of this file is governed by the BSD 3-clause
// license that can be found in the LICENSE.txt file in the project root.
package antlr
import (
antlr "github.com/wrmsr/bane/core/antlr/runtime"
)
type DelimitingSplitter struct {
input antlr.CharStream
interpreter antlr.ILexerATNSimulator
virt antlr.Lexer // The most derived lexer implementation. Allows virtual method calls.
tokenFactorySourcePair *antlr.TokenSourceCharStreamPair
delimToken any
delimiters [][]int
factory antlr.TokenFactory
token antlr.Token
channel int
tokenStartCharIndex int
tokenStartLine int
tokenStartColumn int
text string
thetype int
mode int
hitEOF bool
noSkip bool
}
func NewDelimitingSplitter(
input antlr.CharStream,
interpreter antlr.ILexerATNSimulator,
virt antlr.Lexer,
tokenFactorySourcePair *antlr.TokenSourceCharStreamPair,
) *DelimitingSplitter {
return &DelimitingSplitter{
input: input,
interpreter: interpreter,
virt: virt,
tokenFactorySourcePair: tokenFactorySourcePair,
factory: antlr.CommonTokenFactoryDEFAULT,
tokenStartCharIndex: -1,
tokenStartLine: -1,
tokenStartColumn: -1,
channel: antlr.TokenDefaultChannel,
thetype: antlr.TokenInvalidType,
mode: antlr.LexerDefaultMode,
}
}
func (l *DelimitingSplitter) NextToken() antlr.Token {
tokenStartMarker := l.input.Mark()
defer l.input.Release(tokenStartMarker)
for {
if l.hitEOF {
l.emitEOF()
return l.token
}
l.token = nil
l.channel = antlr.TokenDefaultChannel
l.tokenStartCharIndex = l.input.Index()
l.tokenStartColumn = l.interpreter.GetCharPositionInLine()
l.tokenStartLine = l.interpreter.GetLine()
l.text = ""
continueOuter := false
for {
l.thetype = antlr.TokenInvalidType
ttype := antlr.LexerSkip
ttype = l.safeMatch()
/*
for delimiter in l.delimiters:
if l.match_delimiter(delimiter):
ttype = l.delimiter_token
break
else:
try:
ttype = l.interp.match(input, l.mode)
except LexerNoViableAltException as e:
self.notifyListeners(e) # report error
self.recover(e)
*/
if l.input.LA(1) == antlr.TokenEOF {
l.hitEOF = true
}
if l.thetype == antlr.TokenInvalidType {
l.thetype = ttype
}
if l.thetype == antlr.LexerSkip {
continueOuter = true
break
}
if l.thetype != antlr.LexerMore {
break
}
}
if continueOuter {
continue
}
if l.token == nil {
l.virt.Emit()
}
return l.token
}
}
func (l *DelimitingSplitter) notifyListeners(e antlr.RecognitionException) {
start := l.tokenStartCharIndex
stop := l.input.Index()
text := l.input.GetTextFromInterval(antlr.NewInterval(start, stop))
msg := "token recognition error at: '" + text + "'"
//listener := l.getErrorListenerDispatch()
//listener.SyntaxError(l, nil, l.TokenStartLine, l.TokenStartColumn, msg, e)
_ = msg
}
func (l *DelimitingSplitter) safeMatch() (ret int) {
defer func() {
if e := recover(); e != nil {
if re, ok := e.(antlr.RecognitionException); ok {
l.notifyListeners(re) // Report error
l.Recover(re)
ret = antlr.LexerSkip // default
}
}
}()
return l.interpreter.Match(l.input, l.mode)
}
func (l *DelimitingSplitter) Recover(re antlr.RecognitionException) {
if l.input.LA(1) != antlr.TokenEOF {
if _, ok := re.(*antlr.LexerNoViableAltException); ok {
// Skip a char and try again
l.interpreter.Consume(l.input)
} else {
// TODO: Do we lose character or line position information?
l.input.Consume()
}
}
}
func (l *DelimitingSplitter) emitEOF() antlr.Token {
cpos := l.interpreter.GetCharPositionInLine()
lpos := l.interpreter.GetLine()
eof := l.factory.Create(l.tokenFactorySourcePair, antlr.TokenEOF, "", antlr.TokenDefaultChannel, l.input.Index(), l.input.Index()-1, lpos, cpos)
l.token = eof
return eof
}
func (l *DelimitingSplitter) matchDelimiter(delimiter []int) bool {
for i, c := range delimiter {
if l.input.LA(i+1) != c {
return false
}
}
l.input.Seek(l.input.Index() + len(delimiter))
return true
}
/*
def split(self) -> ta.Tuple[ta.List[ta.Tuple[str, str]], str]:
lst = []
sb = io.StringIO()
while True:
token = self.nextToken()
if token.type == antlr4.Token.EOF:
break
if token.type == l.delimiter_token:
statement = sb.getvalue().strip()
if statement:
lst.append((statement, token.text))
sb = io.StringIO()
else:
sb.write(token.text)
partial = sb.getvalue()
return lst, partial
*/