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POantlrworks with multiple equals
 

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  1. POantlrworks with multiple equals
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    <p>I'm having a problem with my grammar.</p> <p>It says Decision can match input such as <code>"{EQUAL, GREATER..GREATER_EQUAL, LOWER..LOWER_EQUAL, NOT_EQUAL}" using multiple alternatives: 1, 2</code>, Although all the trees of rules are correct.</p> <p>Anyone to help?!</p> <pre><code>grammar test; //parser : .* EOF; program :T_PROGRAM ID T_LEFTPAR identifier_list T_RIGHTPAR T_SEMICOLON declarations subprogram_declarations compound_statement T_DOT; identifier_list :(ID) (',' ID)*; declarations :() (T_VAR identifier_list COLON type T_SEMICOLON)* ; type : standard_type| T_ARRAY T_LEFTBRACK NUM T_TO NUM T_RIGHTBRACK T_OF standard_type ; standard_type : INT | FLOAT ; subprogram_declarations :() (subprogram_declaration T_SEMICOLON)* ; subprogram_declaration : subprogram_head declarations compound_statement; subprogram_head :T_FUNCTION ID arguments COLON standard_type | T_PROCEDURE ID arguments ; arguments :T_LEFTPAR parameter_list T_RIGHTPAR | ; parameter_list :(identifier_list COLON type) (T_SEMICOLON identifier_list COLON type)*; compound_statement : T_BEGIN optional_statements T_END; optional_statements :statement_list | ; statement_list :(statement) (T_SEMICOLON statement)*; statement : variable ASSIGN expression | procedure_statement | compound_statement | T_IF expression T_THEN statement T_ELSE statement | T_WHILE expression T_DO statement ; procedure_statement :ID | ID T_LEFTPAR expression_list T_RIGHTPAR; expression_list : (expression) (',' expression)*; variable : ID T_LEFTBRACK expression T_RIGHTBRACK | ; expression :( () |simple_expression) (( LOWER | LOWER_EQUAL | GREATER | GREATER_EQUAL | EQUAL | NOT_EQUAL ) simple_expression)* ; simple_expression : ( () | sign ) term (( PLUS | MINUS | T_OR ) term)*; term : (factor) (( CROSS | DIVIDE | MOD | T_AND ) factor)*; factor : variable |ID T_LEFTPAR expression_list T_RIGHTPAR | NUM | T_LEFTPAR expression T_RIGHTPAR | T_NOT factor; sign : '+' | '-'; /********/ T_PROGRAM : 'program'; T_FUNCTION : 'function'; T_PROCEDURE : 'procedure'; T_READ : 'read'; T_WRITE : 'write'; T_OF : 'of'; T_ARRAY : 'array'; T_VAR : 'var'; T_FLOAT : 'float'; T_INT : 'int'; T_CHAR : 'char'; T_STRING : 'string'; T_BEGIN : 'begin'; T_END : 'end'; T_IF : 'if'; T_THEN : 'then'; T_ELSE : 'else'; T_WHILE : 'while'; T_DO : 'do'; T_NOT : 'not'; NUM : INT | FLOAT; STRING : '"' ( ESC_SEQ | ~('\\'|'"') )* '"' ; CHAR: '\'' ( ESC_SEQ | ~('\''|'\\') ) '\'' ; ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')* ; COMMENT : '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;} | '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;} ; LOWER : '&lt;'; LOWER_EQUAL : '&lt;='; GREATER : '&gt;'; GREATER_EQUAL : '&gt;='; EQUAL : '='; NOT_EQUAL : '&lt;&gt;'; ASSIGN : ':='; COLON : ':'; PLUS : '+'; MINUS : '-'; T_OR : 'OR'; CROSS : '*'; DIVIDE : '/'; MOD : 'MOD'; T_AND : 'AND'; T_LEFTPAR : '('; T_RIGHTPAR : ')'; T_LEFTBRACK : '['; T_RIGHTBRACK : ']'; T_TO : '..'; T_DOT : '.'; T_SEMICOLON : ';'; T_COMMA : ','; T_BADNUM : (NUM)(CHAR)*; T_BADSTRING : '"' ( ESC_SEQ | ~('\\'|'"') )*WS; WS : ( ' ' | '\t' | '\r' | '\n' ) {$channel=HIDDEN;} ; fragment EXPONENT : ('e'|'E') ('+'|'-')? ('0'..'9')+ ; fragment HEX_DIGIT : ('0'..'9'|'a'..'f'|'A'..'F') ; fragment ESC_SEQ : '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\') | UNICODE_ESC | OCTAL_ESC ; fragment OCTAL_ESC : '\\' ('0'..'3') ('0'..'7') ('0'..'7') | '\\' ('0'..'7') ('0'..'7') | '\\' ('0'..'7') ; fragment UNICODE_ESC : '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT ; fragment INT : '0'..'9'+ ; fragment FLOAT : ('0'..'9')+ '.' ('0'..'9')* EXPONENT? | '.' ('0'..'9')+ EXPONENT? | ('0'..'9')+ EXPONENT ; </code></pre>
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