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[Grammatica-users] Grammar with single-quoted stings
From: |
Schilha, Matthias |
Subject: |
[Grammatica-users] Grammar with single-quoted stings |
Date: |
Wed, 23 Mar 2011 15:08:01 +0100 |
Hi,
i want to write a grammar to accept strings like this: a = 'b'
To do that, I write this grammar:
%header%
GRAMMARTYPE = "LL"
%tokens%
EQ = "="
S_QUOTE = "'"
NUMBER = <<[0-9]+>>
IDENTIFIER = <<'[A-Za-z§][A-Za-z0-9_§]*>>
WHITESPACE = <<[ \t\n\r]+'>> %ignore%
%productions%
Expression = IDENTIFIER AtomComparisonTail;
AtomComparisonTail = Comparison Atom
| Comparison "'" Atom "'";
Comparison = "=";
Atom = NUMBER
| IDENTIFIER;
But it doesn't work. I get the message: unexpected character ''', on line: 1
column: 3
In this way I changed my grammar to
%header%
GRAMMARTYPE = "LL"
%tokens%
EQ = "="
S_QUOTE = "'"
QUOTED_STRING = <<('[^']*')>>
NUMBER = <<[0-9]+>>
IDENTIFIER = <<'[A-Za-z§][A-Za-z0-9_§]*>>
WHITESPACE = <<[ \t\n\r]+'>> %ignore%
%productions%
Expression = IDENTIFIER AtomComparisonTail;
AtomComparisonTail = Comparison Atom
| Comparison QUOTED_STRING Atom QUOTED_STRING;
Comparison = "=";
Atom = NUMBER
| IDENTIFIER;
But it is still not working.
Have someone another idea to solve this problem.
Thank you very much.
Matthias
- [Grammatica-users] Grammar with single-quoted stings,
Schilha, Matthias <=