Hi All,
I am new to ANTLR. I am generating a subset of ECMA-262/ActionScript
grammar. Please help me in validating the grammar.
Can anyone please let me know the following grammar will generate
proper AST and tokens?
___________________________________________________________________________________________________________
grammar TEST;
options{
output=AST;
}
tokens{
PACKAGE;
CLASS;
LPARA;
RPARA;
IDENTIFIER;
NEW;
VAR;
WS;
}
@parser::header{
package test;
}
@lexer::header{
package test;
}
compilationUnit : packageDecl packageBlock* EOF!;
packageDecl : PACKAGE IDENTIFIER packageBlock;
packageBlock : LPARA packageBlockEntry* RPARA;
packageBlockEntry : importDefinition* classDefinition;
importDefinition : IMPORT IDENTSTAR SEMI!;
classDefinition : CLASS IDENTIFIER LPARA classBody RPARA;
classBody : variableDefinition* methodDefinition*;
variableDefinition : VAR IDENTIFIER SEMI!
| VAR IDENTIFIER EQUALS NEW IDENT LPARA RPARA
SEMI!
| VAR IDENTIFIER EQUALS IDENTIFIER SEMI!
| VAR IDENTIFIER EQUALS CONSTLITERAL SEMI!;
methodDefinition : modifier? (STATIC | NATIVE)? FUNCTION IDENTIFIER
(COLON (VOID|IDENTIFIER))? LPARA statement* RPARA;
statement : SEMI!
| declarationStatement
| expressionStatement
| ifStatement
| forStatement
| forEachStatement
| whileStatement
| doWhileStatement
| switchStatement
| breakStatement
| continueStatement
| returnStatement
| throwStatement
| tryStatement;
modifier : 'public'
| 'private'
| 'protected';
PACKAGE : 'package';
IMPORT : 'import;
CLASS : 'class';
NEW : 'new';
VAR : 'var' | 'const';
FUNCTION: 'function';
VOID : 'void';
STATIC : 'static';
NATIVE : 'native';
LPARA : '{';
RPARA : '}';
EQUALS : '=';
UNDERSCORE : '_';
HYPHEN : '-';
DOT : '.';
STAR : '*';
COLON : ':';
IDENTIFIER : ('a'..'z' | 'A'..'Z')+ ('a'..'z' | '0'..'9' | UNDERSCORE
| HYPHEN)*;
IDENT : ('a'..'z' | 'A'..'Z')+ ('a'..'z' | '0'..'9' | UNDERSCORE |
HYPHEN | DOT)*;
IDENTSTAR : ('a'..'z' | 'A'..'Z')+ ('a'..'z' | '0'..'9' |
UNDERSCORE |
HYPHEN | DOT | STAR)*;
CONSTLITERAL : (('a'...'z')* | ('0..9')*);
WS : (' ' | '\t' | '\f')+ {skip();};
SEMI : ';';
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