javacc

I cleary have the unicode whitespace characters defined in my SKIP token like so: SKIP { " " | "\r" | "\n" | "\t" } However, when I run Java CC it parses all the tokens fine until I hit any of the above mentioning white space characters and it throws the following error: Exception in thread "main" prjct1.TokenMgrError: Lexical error at line 1, column 25. Encountered: "\r" (13), after : "Random:Word:Here" So as you can see it runs fine until it hits the "\r". I get the same error with " ", "\n", and "\t". Any thoughts? thanks Make sure you have a colon between the SKIP and your bracket. SKIP: {

In my grammar there are production rules for expressions and fragments which originally contained indirect left recursion. This is the rules after I removed the recursion from them. String expression() #Expression : {String number; Token t;} { number = fragment() ( (t = <Mult_Sign> number = fragment()) ) {return number;} } String fragment() #void : {String t;} { t = identifier() {return t;} | t = number() {return t;} | (<PLUS> | <MINUS> ) fragment() | <LBR> expression() <RBR> } These production rules are used when trying to parse a condition in the grammar. However the ordering of the

I am new to JavaCC and cannot figure out how to get it running. I am using Mac OS X and I installed javacc-6.0.zip and unzipped it. I am unable to make the javacc script accessible from my path as on typing javacc on the terminal I get the following message: -bash: javacc: command not found How do I make the javacc script accessible from my path? My unzipped folder javacc-6.0 is in the following directory: /Users/Rishabh/Desktop/javacc So I do the following on the terminal: PATH=$PATH\:/Users/Rishabh/Desktop/javacc/javacc-6.0/ Typing javacc next gives me the same message. The version of JavaCC

It's very difficult to find this kind of document online. I found one in JAVAWORLD, but this one does not cover the jjTree and visitor one. Does anybody happen to have some links to the tutorials? zimbu668 Its been a while, but I found this tutorial very helpful on a previous project. I was able to create a query language for our application in a few days with basically no previous experience with javacc. I've not read it but while looking for the other tutorial I also found this one . You can find a bunch of blog posts I've made regarding various JavaCC/JJTree topics on my JavaCC book's web

I need to make a simple calculator (with infix operator) parser that handle the operators +,-,*,/ and float and variable. To make this I used javacc, and I have made this grammar with jjtree. It works but it doesn't ensure that the final tree will be a binary tree, which I need. I want something like 5*3+x-y to generate the following tree : * / \ 5 + / \ 3 - / \ x y What would be a proper grammar to do that, that would not be left-recursive ? Something like the following will give you the tree you asked for. void sum(): {} { term() [ plus() sum() | minus() sum() | times() sum() | divide() sum(

I am finishing my ECMAScript 5.1/JavaScript grammar for JavaCC . I've done all the tokens and productions according to the specification. Now I'm facing a big question which I don't know how to solve. JavaScript has this nice feature of the automatic semicolon insertion: What are the rules for JavaScript's automatic semicolon insertion (ASI)? To quote the specifications , the rules are: There are three basic rules of semicolon insertion: When, as the program is parsed from left to right, a token (called the offending token) is encountered that is not allowed by any production of the grammar,

I have an assignment to create a lexical analyser and I've got everything working except for one bit. I need to create a string that will accept a new line, and the string is delimited by double quotes. The string accepts any number, letter, some specified punctuation, backslashes and double quotes within the delimiters. I can't seem to figure out how to escape a new line character. Is there a certain way of escaping characters like new line and tab? Here's some of my code that might help < STRING : ( < QUOTE> (< QUOTE > | < BACKSLASH > | < ID > | < NUM > | " " )* <QUOTE>) > < #QUOTE : "\"" >

Basic requirement is use keyword as identifier, so I want to distinguish the token from it's context.(e.g. class is a keyword, but we allowed a variable named class ). In java, this is possible, but it's so hard, here is how I do it TOKEN : { <I_CAL: "CAL"> : DO_CAL | <I_CALL: "CALL"> | <I_CMP: "CMP"> | <I_EXIT: "EXIT"> | <I_IN: "IN"> | <I_JMP: "JMP"> | <I_JPC: "JPC"> : NEED_CMP_OP | <I_LD: "LD"> : NEED_DATA_TYPE | <I_NOP: "NOP"> | <I_OUT: "OUT"> | <I_POP: "POP"> | <I_PUSH: "PUSH"> | <I_RET: "RET"> | <I_DATA: "DATA"> : DO_DATA | <I_BLOCK: ".BLOCK"> } // T prefix for Token TOKEN : { <T_REGISTER