antlr

ANTLR Grammar for expressions

由 六月ゝ 毕业季﹏ 提交于 2019-11-28 08:59:39
问题 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';

ANTLR: From CommonTree to useful object graph

由 纵然是瞬间 提交于 2019-11-28 08:47:37
I started using ANTLR today and I've created a basic parser. After parsing I end up with a tree. To me it seems like this is just a bunch of String s put together in a tree structure of Tree -nodes. That's not very useful to me. I'd like to have a graph of objects. To clarify (this is an example, and not my real application): For "5-1+6" I seem to end up with: new String("PLUS") new String("MINUS") new String("5") new String("1") new String("6") What I would find more useful: new Plus( new Minus( new IntegerLiteral(5), new IntegerLiteral(1)), new IntegerLiteral(6)) What is the most convenient

Antlr4 how to build a grammar allowed keywords as identifier

由 人走茶凉 提交于 2019-11-28 08:02:14
问题 This is a demo code label: var id let id = 10 goto label If allowed keyword as identifier will be let: var var let var = 10 goto let This is totally legal code. But it seems very hard to do this in antlr. AFAIK, If antlr match a token let, will never fallback to id token. so for antlr it will see LET_TOKEN : VAR_TOKEN <missing ID_TOKEN>VAR_TOKEN LET_TOKEN <missing ID_TOKEN>VAR_TOKEN = 10 although antlr allowed predicate, I have to control ever token match and problematic. grammar become this

Java Tree parser output for ANTLR

由 夙愿已清 提交于 2019-11-28 07:52:18
I've found a sample template in the ANTLR website, its the Javatreeparser.g, which the site says could produce the AST that I need, but since I'm new to ANTLR, how do I make it show? What I've done so far is placing the grammar file together with my existing java grammar. But I have no idea on how to use and output the AST that I need from the file. How do I do it? Bart Kiers I've found a sample template in the ANTLR website, its the Javatreeparser.g, which the site says could produce the AST that I need, No, the combined grammar Java.g from the ANTLR wiki produces a lexer and parser for Java

Trouble Setting Up ANTLR 4 IDE on Eclipse Luna (4.4)

由 安稳与你 提交于 2019-11-28 07:35:18
I'm trying to install the ANTLR 4 IDE on Eclipse Luna (4.4). I've installed it from the Marketplace but I have no idea how to create a project that has an ANTLR 4 Lexer/Parser in it. When I go to create a new project I don't see any options for ANTLR 4. I tried creating a .g4 file and it opens in the editor but when I save it doesn't do anything. I looked around all over the internet and found a handful of resources that I cobbled together and found a solution by trial and error. Below is a guide that I've used on a few of my machines to get ANTLR 4 IDE setup in Eclipse. I figured I should

antlr generate ast for c and parse the ast

由 点点圈 提交于 2019-11-28 06:01:38
问题 I am doing static analyze on c program.And I search the antlr website ,there seems to be no appropriate grammar file that produce ast for c program.Does it mean I have to do it myself from the very start.Or is there a quicker method.I also need a tree parser that can traverse the ast created by the parser. 回答1: You indicated you want to do static analysis to detect buffer overflow. First, writing a grammar for C is harder than it looks. There's all that stuff in the standard, and then there's

Use ANTLR to parse C++ with C#

由 末鹿安然 提交于 2019-11-28 05:41:29
问题 I'm trying to use ANTLR to get a C++ AST, if possible from my C# code base. Now, the basic workflow seems clear to me: Generate .cs lexer and parser using ANTLRWorks, add them and the ANTLR-references to a C# project, give it a C++ source, work with resulting data structures. However, I'm already failing at the second step. I downloaded C++ grammars from http://www.antlr.org/grammar/list (I tried "C++ grammar " by Aurelian Melinte and "C++ grammar and code tracer for ANTLR 3.2" by Ramin Zaghi

Interactive Antlr

由 女生的网名这么多〃 提交于 2019-11-28 04:37:15
问题 I'm trying to write a simple interactive (using System.in as source) language using antlr, and I have a few problems with it. The examples I've found on the web are all using a per line cycle, e.g.: while(readline) result = parse(line) doStuff(result) But what if I'm writing something like pascal/smtp/etc, with a "first line" looks like X requirment? I know it can be checked in doStuff, but I think logically it is part of the syntax. Or what if a command is split into multiple lines? I can

How do I make a TreeParser in ANTLR3?

由 房东的猫 提交于 2019-11-28 04:33:46
问题 I'm attemping to learn language parsing for fun... I've created a ANTLR grammar which I believe will match a simple language I am hoping to implement. It will have the following syntax: <FunctionName> ( <OptionalArguments>+) { <OptionalChildFunctions>+ } Actual Example: ForEach(in:[1,2,3,4,5] as:"nextNumber") { Print(message:{nextNumber}) } I believe I have the grammar working correctly to match this construct, and now I am attemping to build an Abstract Syntax Tree for the language. Firstly,

How Get error messages of antlr parsing?

由 二次信任 提交于 2019-11-28 04:31:39
问题 I wrote a grammar with antlr 4.4 like this : grammar CSV; file : row+ EOF ; row : value (Comma value)* (LineBreak | EOF) ; value : SimpleValueA | QuotedValue ; Comma : ',' ; LineBreak : '\r'? '\n' | '\r' ; SimpleValue : ~(',' | '\r' | '\n' | '"')+ ; QuotedValue : '"' ('""' | ~'"')* '"' ; then I use antlr 4.4 for generating parser & lexer, this process is successful after generate classes I wrote some java code for using grammar import org.antlr.v4.runtime.ANTLRInputStream; import org.antlr.v4
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