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/* cvc_lexer.g
* Original author: dejan
* Major contributors:
* Minor contributors (to current version): none
* This file is part of the CVC4 prototype.
* Copyright (c) 2009 The Analysis of Computer Systems Group (ACSys)
* Courant Institute of Mathematical Sciences
* New York University
* See the file COPYING in the top-level source directory for licensing
* information.
*
* Lexer for CVC presentation language.
*/
options {
language = "Cpp"; // C++ output for antlr
namespaceStd = "std"; // Cosmetic option to get rid of long defines in generated code
namespaceAntlr = "antlr"; // Cosmetic option to get rid of long defines in generated code
namespace = "CVC4::parser"; // Wrap everything in the smtparser namespace
}
/**
* AntlrCvcLexer class is a stream tokenizer (lexer) for the CVC language.
*/
class AntlrCvcLexer extends Lexer;
options {
exportVocab = CvcVocabulary; // Name of the shared token vocabulary
testLiterals = false; // Do not check for literals by default
defaultErrorHandler = false; // Skip the defaul error handling, just break with exceptions
k = 2;
}
/*
* The tokens that might match with the identifiers go here. Otherwise define
* them below.
*/
tokens {
// Types
BOOLEAN = "BOOLEAN";
// Boolean oparators
AND = "AND";
IF = "IF";
THEN = "THEN";
ELSE = "ELSE";
ELSEIF = "ELSIF";
ENDIF = "ENDIF";
NOT = "NOT";
OR = "OR";
TRUE = "TRUE";
FALSE = "FALSE";
XOR = "XOR";
// Commands
ASSERT = "ASSERT";
QUERY = "QUERY";
CHECKSAT = "CHECKSAT";
PRINT = "PRINT";
ECHO = "ECHO";
PUSH = "PUSH";
POP = "POP";
POPTO = "POPTO";
}
// Operators
COMMA : ',';
IMPLIES : "=>";
IFF : "<=>";
/**
* Matches any letter ('a'-'z' and 'A'-'Z').
*/
protected
ALPHA options { paraphrase = "a letter"; }
: 'a'..'z'
| 'A'..'Z'
;
/**
* Matches the digits (0-9)
*/
protected
DIGIT options { paraphrase = "a digit"; }
: '0'..'9'
;
/**
* Matches the ':'
*/
COLON options { paraphrase = "a colon"; }
: ':'
;
/**
* Matches the 'l'
*/
SEMICOLON options { paraphrase = "a semicolon"; }
: ';'
;
/**
* Matches an identifier from the input. An identifier is a sequence of letters,
* digits and "_", "'", "." symbols, starting with a letter.
*/
IDENTIFIER options { paraphrase = "an identifier"; testLiterals = true; }
: ALPHA (ALPHA | DIGIT | '_' | '\'' | '.')*
;
/**
* Matches the left bracket ('(').
*/
LPAREN options { paraphrase = "a left parenthesis '('"; }
: '(';
/**
* Matches the right bracket ('(').
*/
RPAREN options { paraphrase = "a right parenthesis ')'"; }
: ')';
/**
* Matches and skips whitespace in the input and ignores it.
*/
WHITESPACE options { paraphrase = "whitespace"; }
: (' ' | '\t' | '\f') { $setType(antlr::Token::SKIP); }
;
/**
* Matches and skips the newline symbols in the input.
*/
NEWLINE options { paraphrase = "a newline"; }
: ('\r' '\n' | '\r' | '\n') { $setType(antlr::Token::SKIP); newline(); }
;
/**
* Matches the comments and ignores them
*/
COMMENT options { paraphrase = "comment"; }
: '%' (~('\n' | '\r'))* { $setType(antlr::Token::SKIP); }
;
/**
* Matches a numeral from the input (non-empty sequence of digits).
*/
NUMERAL options { paraphrase = "a numeral"; }
: (DIGIT)+
;
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