Single quoted literal value fails Antlr lexer
I have a lexer rule that defines single-quoted literal string as
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* '''
It fails one particular case:
'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
The problem is really with the last two single quotes. If I added a space in between, it worked. Or I could use two single quotes to end and it worked too, e.g.
'yyyy-MM-dd\'T\'HH:mm:ss\'Z'''
I am not sure if it has something to do with having a non-greedy operator which caused the first-match of (''' ''')? If so, I don't see how the last version could have worked.
In any event, could someone help please?
UPDATE - I am not able to reproduce it outside of the full grammar. This may be a red herring.
UPDATE - I missed some important context so I posted another question here Antlr4: single quote rule fails when there are escape chars plus carriage return, new line
antlr antlr4
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
add a comment |
I have a lexer rule that defines single-quoted literal string as
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* '''
It fails one particular case:
'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
The problem is really with the last two single quotes. If I added a space in between, it worked. Or I could use two single quotes to end and it worked too, e.g.
'yyyy-MM-dd\'T\'HH:mm:ss\'Z'''
I am not sure if it has something to do with having a non-greedy operator which caused the first-match of (''' ''')? If so, I don't see how the last version could have worked.
In any event, could someone help please?
UPDATE - I am not able to reproduce it outside of the full grammar. This may be a red herring.
UPDATE - I missed some important context so I posted another question here Antlr4: single quote rule fails when there are escape chars plus carriage return, new line
antlr antlr4
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
1
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
2
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52
add a comment |
I have a lexer rule that defines single-quoted literal string as
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* '''
It fails one particular case:
'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
The problem is really with the last two single quotes. If I added a space in between, it worked. Or I could use two single quotes to end and it worked too, e.g.
'yyyy-MM-dd\'T\'HH:mm:ss\'Z'''
I am not sure if it has something to do with having a non-greedy operator which caused the first-match of (''' ''')? If so, I don't see how the last version could have worked.
In any event, could someone help please?
UPDATE - I am not able to reproduce it outside of the full grammar. This may be a red herring.
UPDATE - I missed some important context so I posted another question here Antlr4: single quote rule fails when there are escape chars plus carriage return, new line
antlr antlr4
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
I have a lexer rule that defines single-quoted literal string as
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* '''
It fails one particular case:
'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
The problem is really with the last two single quotes. If I added a space in between, it worked. Or I could use two single quotes to end and it worked too, e.g.
'yyyy-MM-dd\'T\'HH:mm:ss\'Z'''
I am not sure if it has something to do with having a non-greedy operator which caused the first-match of (''' ''')? If so, I don't see how the last version could have worked.
In any event, could someone help please?
UPDATE - I am not able to reproduce it outside of the full grammar. This may be a red herring.
UPDATE - I missed some important context so I posted another question here Antlr4: single quote rule fails when there are escape chars plus carriage return, new line
antlr antlr4
antlr antlr4
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
edited Nov 25 '18 at 6:02
Bing Wu
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
asked Nov 22 '18 at 8:06
Bing WuBing Wu
240111
240111
1
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
2
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52
add a comment |
1
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
2
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52
1
1
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
2
2
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52
add a comment |
1 Answer
1
active
oldest
votes
I can't reproduce that. Given the following grammar:
lexer grammar Test;
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* ''';
OTHER : . ;
which can be tested as follows:
String source = "A'yyyy-MM-dd\\'T\\'HH:mm:ss\\'Z\\''B";
Test lexer = new Test(CharStreams.fromString(source));
CommonTokenStream tokens = new CommonTokenStream(lexer);
tokens.fill();
for (Token t : tokens.getTokens()) {
System.out.printf("%-15s %sn", Test.VOCABULARY.getSymbolicName(t.getType()), t.getText());
}
will print:
OTHER A
L_S_STRING 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
OTHER B
EOF <EOF>
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I can't reproduce that. Given the following grammar:
lexer grammar Test;
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* ''';
OTHER : . ;
which can be tested as follows:
String source = "A'yyyy-MM-dd\\'T\\'HH:mm:ss\\'Z\\''B";
Test lexer = new Test(CharStreams.fromString(source));
CommonTokenStream tokens = new CommonTokenStream(lexer);
tokens.fill();
for (Token t : tokens.getTokens()) {
System.out.printf("%-15s %sn", Test.VOCABULARY.getSymbolicName(t.getType()), t.getText());
}
will print:
OTHER A
L_S_STRING 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
OTHER B
EOF <EOF>
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
add a comment |
I can't reproduce that. Given the following grammar:
lexer grammar Test;
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* ''';
OTHER : . ;
which can be tested as follows:
String source = "A'yyyy-MM-dd\\'T\\'HH:mm:ss\\'Z\\''B";
Test lexer = new Test(CharStreams.fromString(source));
CommonTokenStream tokens = new CommonTokenStream(lexer);
tokens.fill();
for (Token t : tokens.getTokens()) {
System.out.printf("%-15s %sn", Test.VOCABULARY.getSymbolicName(t.getType()), t.getText());
}
will print:
OTHER A
L_S_STRING 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
OTHER B
EOF <EOF>
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
add a comment |
I can't reproduce that. Given the following grammar:
lexer grammar Test;
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* ''';
OTHER : . ;
which can be tested as follows:
String source = "A'yyyy-MM-dd\\'T\\'HH:mm:ss\\'Z\\''B";
Test lexer = new Test(CharStreams.fromString(source));
CommonTokenStream tokens = new CommonTokenStream(lexer);
tokens.fill();
for (Token t : tokens.getTokens()) {
System.out.printf("%-15s %sn", Test.VOCABULARY.getSymbolicName(t.getType()), t.getText());
}
will print:
OTHER A
L_S_STRING 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
OTHER B
EOF <EOF>
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
I can't reproduce that. Given the following grammar:
lexer grammar Test;
L_S_STRING : ''' ((''' ''') | ('\' ''') | ~('''))* ''';
OTHER : . ;
which can be tested as follows:
String source = "A'yyyy-MM-dd\\'T\\'HH:mm:ss\\'Z\\''B";
Test lexer = new Test(CharStreams.fromString(source));
CommonTokenStream tokens = new CommonTokenStream(lexer);
tokens.fill();
for (Token t : tokens.getTokens()) {
System.out.printf("%-15s %sn", Test.VOCABULARY.getSymbolicName(t.getType()), t.getText());
}
will print:
OTHER A
L_S_STRING 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\''
OTHER B
EOF <EOF>
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
answered Nov 22 '18 at 10:50
Bart KiersBart Kiers
131k28243248
131k28243248
add a comment |
add a comment |
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1
Can you please tell more about your syntax? How the characters are escaped and the meaning of two single quotes, which strings are valid and which are not.
– trollingchar
Nov 22 '18 at 8:56
2
Please add a MCVE that demonstrates what you describe: stackoverflow.com/help/mcve
– Bart Kiers
Nov 22 '18 at 10:52