antlr

Can someone provide a detailed example as to how I can do this using antlr4? Instructions right from installing antlr4 and its dependencies would be highly appreciated. Here it is. First, you're gonna buy the ANTLR4 book ;-) Second, you'll download antlr4 jar and the java grammar ( http://pragprog.com/book/tpantlr2/the-definitive-antlr-4-reference ) Then, you can change the grammar a little bit, adding these to the header (...) grammar Java; options { language = Java; } // starting point for parsing a java file compilationUnit (...) I'll change a little thing in the grammar just to illustrate

I'm very new to ANTLR4 and am trying to build my own language. So my grammar starts at program: <EOF> | statement | functionDef | statement program | functionDef program; and my statement is statement: selectionStatement | compoundStatement | ...; and selectionStatement : If LeftParen expression RightParen compoundStatement (Else compoundStatement)? | Switch LeftParen expression RightParen compoundStatement ; compoundStatement : LeftBrace statement* RightBrace; Now the problem is, that when I test a piece of code against selectionStatement or statement it passes the test, but when I test it

I have read many questions here on StackOverflow about mutual left-recursion issues in LL(k) parsers. I found the general algorithm for removing left-recursion: A : Aa | b ; becomes A : bR ; R : (aA)? ; However, I cannot figure out how to apply it to my situation. I have left_exp: IDENT | exp DOT IDENT ; exp : handful | of | other rules | left_exp ; The "handful of other rules" all contain regular recursion, such as exp : exp PLUS exp , etc. and have no issues. The issue is with left_exp and exp being mutually recursive. I thought about just adding IDENT and exp DOT IDENT to the exp rules, but

I created my grammar using antlr4 but I want to test robustess is there an automatic tool or a good way to do that fast Thanks :) The only way I found to create unit tests for a grammar is to create a number of examples from a written spec of the given language. This is neither fast, nor complete, but I see no other way. You could be tempted to create test cases directly from the grammar (writing a tool for that isn't that hard). But think a moment about this. What would you test then? Your unit tests would always succeed, unless you use generated test cases from an earlier version of the

What are and how to use the "island grammar" in antlr3? An island grammar is one that treats most of a language as a blob of text ("water") and picks out the part of the langauge of interest to parse using grammar rules ("island"). For instance, you might choose to build an island grammar to pick out all the expressions found in a C# program, and ignore the variable/method/class declarations and the statement syntax (if, while, ...). The real question is, "Should you use island grammars at all?". The positive benefits: you don't have to write a full, complete grammar for the language you want

I'm trying to implement a expression handling grammar (that deals with nested parenthesis and stuff). I have the following so far, but they can't deal with some cases (successful/failure cases appear after the following code block). Anyone know what's going on? Note: The varname += and varname = stuff are just some additional AST generation helper stuff in XText. Don't worry about them for now. ... NilExpression returns Expression: 'nil'; FalseExpression returns Expression: 'false'; TrueExpression returns Expression: 'true'; NumberExpression returns Expression: value=Number; StringExpression

I'm using Antlr 4 with c# target. Here is a subset of my grammar: /* * Parser Rules */ text : term+ EOF; term : a1 a2 a3; a1: .... ... ... I want to accept valid data blocks as (term)s, when error exists I want to search for the next valid term and print out the whole text which caused the error for user to analyze manually. How to synchronize input to the next valid term? and How to get the ignored text? You will need to create your own implementation of IAntlrErrorStrategy for this, and then set the Parser.ErrorHandler property to an instance of your error strategy. The documentation for the