antlr

I'm trying to write a simple parser for an even simpler language that I'm writing. It's composed of postfix expressions. As of now, I'm having issues with the parser. When I run it on the input 2 2 * test >> I get a MismatchedTokenException. Also, how would I go about implementing a recursive postfix parser? Here's my code: grammar star; options { language=Python; output=AST; ASTLabelType=CommonTree; } tokens {DECL;} //start // : decl ; //decl // : type ID -> ^(DECL type ID) // ; program : (body)+ ; body : (nested WS)* | (var WS)* | (get WS)* ; var : nested ID '>>' ; get : ID '<<' ; /

first, sorry about my english, i still learning. I writing Python module for my framework, which parsing CSS files. I try regex, ply (python lexer and parser), but i found myself in ANTLR. First try, i need to parse comments from CSS file. This is my CSS string to parse: /*test*/ /* test1 /* /*test2/*nested*/comment/* I know that CSS doesn't allow nested comments, but i need it in my framework. I wrote simple ANTLR grammar: grammar CSS; options { language = Python; } styleSheet : comments EOF ; comments : NESTED_ML_COMMENT* ; NESTED_ML_COMMENT : '/*' (options {greedy=false;} : (NESTED_ML

I'm using ANTLR4 to parse a syntax file. When I use BaseErrorListener to detect errors, I got a problem. When faced with an illegal input string, ANTLR automatically matches the appropriate branch and then ignores the subsequent stream of characters even if it contains errors. And I want to detect that error. Here are my g4 file and java file. TransitionLexer is my lexer file and TransitionCondition is my parser file. ErrorDialogListener.java is my errorListener and Test.java id main java file. TransitionLexer.g4 lexer grammar TransitionLexer; BOOLEAN: 'true' | 'false'; IF: 'if'; THEN: 'then';

If I use ANTLRFileStream antlrFileStream = new ANTLRFileStream("myfile.testlang"); or ANTLRInputStream input = new ANTLRInputStream( new FileInputStream("myfile.testlang") ); Compiler shows deprecation error for both the classes what is alternative? Ameer Tamboli You can use the CharStreams class instead of the deprecated classes as below. CharStream codePointCharStream = CharStreams.fromFileName("myfile.testlang"); TESTLANGLexer lexer = new TESTLANGLexer(codePointCharStream); TESTLANGParser parser = new TESTLANGParser(new CommonTokenStream(lexer)); parser.addParseListener(new

During taking advantage of ANTLR 3.3, I'm changing the current grammar to support inputs without parenthesis too. Here's the first version of my grammar : grammar PropLogic; NOT : '!' ; OR : '+' ; AND : '.' ; IMPLIES : '->' ; SYMBOLS : ('a'..'z') | '~' ; OP : '(' ; CP : ')' ; prog : formula EOF ; formula : NOT formula | OP formula( AND formula CP | OR formula CP | IMPLIES formula CP) | SYMBOLS ; WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ; Then I changed it this way to support the appropriate features : grammar PropLogic; NOT : '!' ; OR : '+' ; AND : '.' ;

I have a grammar which looks like this consisting of comment and control statements of a particular language: Grammar: grammar DD; ddlist: (ddstmt| jclcomment)+; ddstmt: dd1 | dd2 | dd3 | dd4 ; dd1: JCLBEGIN ddname DDWORD 'DUMMY'; dd2: JCLBEGIN ddname DDWORD 'DYNAM'; dd3: JCLBEGIN ddname DDWORD NAME'=' ('*'|NAME); dd4: JCLBEGIN ddname DDWORD '*' inlinerec INLINESTMTEND?; inlinerec: (INLINEDATA )+ ; fragment INLINEDATA: (~[\r\n])*; ddname: NAME; jclcomment: JCLCOMMENT+; JCLCOMMENT: COMMENTBEGIN ~[\r\n]*; DDWORD: 'DD'; JCLBEGIN: '//' ; COMMENTBEGIN: '//*' ; INLINESTMTEND: '/*' ; NAME : [A-Z#]