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// Copyright (c) 2012-2022 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 (
"testing"
)
type commonTokenStreamTestLexer struct {
*BaseLexer
tokens []Token
i int
}
func (l *commonTokenStreamTestLexer) NextToken() Token {
tmp := l.tokens[l.i]
l.i++
return tmp
}
func TestCommonTokenStreamOffChannel(t *testing.T) {
assert := assertNew(t)
lexEngine := &commonTokenStreamTestLexer{
tokens: []Token{
newTestCommonToken(1, " ", LexerHidden), // 0
newTestCommonToken(1, "x", LexerDefaultTokenChannel), // 1
newTestCommonToken(1, " ", LexerHidden), // 2
newTestCommonToken(1, "=", LexerDefaultTokenChannel), // 3
newTestCommonToken(1, "34", LexerDefaultTokenChannel), // 4
newTestCommonToken(1, " ", LexerHidden), // 5
newTestCommonToken(1, " ", LexerHidden), // 6
newTestCommonToken(1, ";", LexerDefaultTokenChannel), // 7
newTestCommonToken(1, "\n", LexerHidden), // 9
newTestCommonToken(TokenEOF, "", LexerDefaultTokenChannel), // 10
},
}
tokens := NewCommonTokenStream(lexEngine, TokenDefaultChannel)
assert.Equal("x", tokens.LT(1).GetText()) // must skip first off channel token
tokens.Consume()
assert.Equal("=", tokens.LT(1).GetText())
assert.Equal("x", tokens.LT(-1).GetText())
tokens.Consume()
assert.Equal("34", tokens.LT(1).GetText())
assert.Equal("=", tokens.LT(-1).GetText())
tokens.Consume()
assert.Equal(";", tokens.LT(1).GetText())
assert.Equal("34", tokens.LT(-1).GetText())
tokens.Consume()
assert.Equal(TokenEOF, tokens.LT(1).GetTokenType())
assert.Equal(";", tokens.LT(-1).GetText())
assert.Equal("34", tokens.LT(-2).GetText())
assert.Equal("=", tokens.LT(-3).GetText())
assert.Equal("x", tokens.LT(-4).GetText())
}
func TestCommonTokenStreamFetchOffChannel(t *testing.T) {
assert := assertNew(t)
lexEngine := &commonTokenStreamTestLexer{
tokens: []Token{
newTestCommonToken(1, " ", LexerHidden), // 0
newTestCommonToken(1, "x", LexerDefaultTokenChannel), // 1
newTestCommonToken(1, " ", LexerHidden), // 2
newTestCommonToken(1, "=", LexerDefaultTokenChannel), // 3
newTestCommonToken(1, "34", LexerDefaultTokenChannel), // 4
newTestCommonToken(1, " ", LexerHidden), // 5
newTestCommonToken(1, " ", LexerHidden), // 6
newTestCommonToken(1, ";", LexerDefaultTokenChannel), // 7
newTestCommonToken(1, " ", LexerHidden), // 8
newTestCommonToken(1, "\n", LexerHidden), // 9
newTestCommonToken(TokenEOF, "", LexerDefaultTokenChannel), // 10
},
}
tokens := NewCommonTokenStream(lexEngine, TokenDefaultChannel)
tokens.Fill()
assert.Nil(tokens.GetHiddenTokensToLeft(0, -1))
assert.Nil(tokens.GetHiddenTokensToRight(0, -1))
assert.Equal("[[@0,0:0=' ',<1>,channel=1,0:-1]]", tokensToString(tokens.GetHiddenTokensToLeft(1, -1)))
assert.Equal("[[@2,0:0=' ',<1>,channel=1,0:-1]]", tokensToString(tokens.GetHiddenTokensToRight(1, -1)))
assert.Nil(tokens.GetHiddenTokensToLeft(2, -1))
assert.Nil(tokens.GetHiddenTokensToRight(2, -1))
assert.Equal("[[@2,0:0=' ',<1>,channel=1,0:-1]]", tokensToString(tokens.GetHiddenTokensToLeft(3, -1)))
assert.Nil(tokens.GetHiddenTokensToRight(3, -1))
assert.Nil(tokens.GetHiddenTokensToLeft(4, -1))
assert.Equal("[[@5,0:0=' ',<1>,channel=1,0:-1], [@6,0:0=' ',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToRight(4, -1)))
assert.Nil(tokens.GetHiddenTokensToLeft(5, -1))
assert.Equal("[[@6,0:0=' ',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToRight(5, -1)))
assert.Equal("[[@5,0:0=' ',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToLeft(6, -1)))
assert.Nil(tokens.GetHiddenTokensToRight(6, -1))
assert.Equal("[[@5,0:0=' ',<1>,channel=1,0:-1], [@6,0:0=' ',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToLeft(7, -1)))
assert.Equal("[[@8,0:0=' ',<1>,channel=1,0:-1], [@9,0:0='\\n',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToRight(7, -1)))
assert.Nil(tokens.GetHiddenTokensToLeft(8, -1))
assert.Equal("[[@9,0:0='\\n',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToRight(8, -1)))
assert.Equal("[[@8,0:0=' ',<1>,channel=1,0:-1]]",
tokensToString(tokens.GetHiddenTokensToLeft(9, -1)))
assert.Nil(tokens.GetHiddenTokensToRight(9, -1))
}
type commonTokenStreamTestLexerSingleEOF struct {
*BaseLexer
tokens []Token
i int
}
func (l *commonTokenStreamTestLexerSingleEOF) NextToken() Token {
return newTestCommonToken(TokenEOF, "", LexerDefaultTokenChannel)
}
func TestCommonTokenStreamSingleEOF(t *testing.T) {
assert := assertNew(t)
lexEngine := &commonTokenStreamTestLexerSingleEOF{}
tokens := NewCommonTokenStream(lexEngine, TokenDefaultChannel)
tokens.Fill()
assert.Equal(TokenEOF, tokens.LA(1))
assert.Equal(0, tokens.index)
assert.Equal(1, tokens.Size())
}
func TestCommonTokenStreamCannotConsumeEOF(t *testing.T) {
assert := assertNew(t)
lexEngine := &commonTokenStreamTestLexerSingleEOF{}
tokens := NewCommonTokenStream(lexEngine, TokenDefaultChannel)
tokens.Fill()
assert.Equal(TokenEOF, tokens.LA(1))
assert.Equal(0, tokens.index)
assert.Equal(1, tokens.Size())
assert.Panics(tokens.Consume)
}
func TestCommonTokenStreamGetTextFromInterval(t *testing.T) {
assert := assertNew(t)
lexEngine := &commonTokenStreamTestLexer{
tokens: []Token{
newTestCommonToken(1, " ", LexerHidden), // 0
newTestCommonToken(1, "x", LexerDefaultTokenChannel), // 1
newTestCommonToken(1, " ", LexerHidden), // 2
newTestCommonToken(1, "=", LexerDefaultTokenChannel), // 3
newTestCommonToken(1, "34", LexerDefaultTokenChannel), // 4
newTestCommonToken(1, " ", LexerHidden), // 5
newTestCommonToken(1, " ", LexerHidden), // 6
newTestCommonToken(1, ";", LexerDefaultTokenChannel), // 7
newTestCommonToken(1, " ", LexerHidden), // 8
newTestCommonToken(1, "\n", LexerHidden), // 9
newTestCommonToken(TokenEOF, "", LexerDefaultTokenChannel), // 10
},
}
tokens := NewCommonTokenStream(lexEngine, TokenDefaultChannel)
assert.Equal("x", tokens.GetTextFromInterval(&Interval{Start: 1, Stop: 1}))
assert.Equal(len(tokens.tokens), 2)
assert.Equal(" x =34 ; \n", tokens.GetTextFromInterval(nil))
assert.Equal(len(tokens.tokens), 11)
}
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