antlr4

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

I'm trying to write an ANTLR4 grammar for a fortran-inspired DSL. I'm having difficulty with the 'ole classic ".op." operators: if (1.and.1) then where both "1"s should be intepreted as integer. I looked at the OpenFortranParser for insight, but I can't make sense out of it. Initially, I had suitable definitions for INTEGER and REAL in my lexer. Consequently, the first "1" above always parsed as a REAL, no matter what I tried. I tried moving things into the parser, and got it to the point where I could reliably recognize the ".and." along with numbers around it as appropriately INTEGER or REAL

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#]

I am using Antlr4 and java7 grammar ( source ) for modifying an input Java Source file. More specifically, I am using the TokenStreamRewriter class to modify some tokens. The following code is a sample that shows how the tokens are modified: public class TestListener extends JavaBaseListener { private TokenStreamRewriter rewriter; rewriter = new TokenStreamRewriter(tokenStream); rewriter.replace(ctx.getStart(), ctx.getStop(), "someText"); } When I print the altered source code, the white spaces and tabs are removed and the new source file's format is like this: importjava.util.ArrayList

I used ANTLR version 4 for creating compiler.First Phase was the Lexer part. I created "CompilerLexer.g4" file and putted lexer rules in it.It works fine. CompilerLexer.g4: lexer grammar CompilerLexer; INT : 'int' ; //1 FLOAT : 'float' ; //2 BEGIN : 'begin' ; //3 END : 'end' ; //4 To : 'to' ; //5 NEXT : 'next' ; //6 REAL : 'real' ; //7 BOOLEAN : 'bool' ; //8 . . . NOTEQUAL : '!=' ; //46 AND : '&&' ; //47 OR : '||' ; //48 POW : '^' ; //49 ID : [a-zA-Z]+ ; //50 WS : ' ' -> channel(HIDDEN) //50 ; Now it is time for phase 2 which is the parser.I created "CompilerParser.g4" file and putted grammars