ANTLR, Dynamic variables

Posted by JTS on Stack Overflow See other posts from Stack Overflow or by JTS
Published on 2010-06-11T16:28:11Z Indexed on 2010/06/11 16:32 UTC
Read the original article Hit count: 287

Filed under:

antlr

Hello,

I have an ANTLR grammar that can parse and evaluate simple expressions like 1+2*4, etc. What I would like to do is to evaluate expressions like 2+$a-$b/4 where the $ variables are dynamic variables, that come from an external source and are continuously updated.

Is there any design pattern on how to do this using ANTLR, best practices, etc?

Shall I "substring" the $a with the updated value ($a -> 4.34)
A nicer way to do this?

Thx

Related posts about antlr

Antlr question: cannot get Antlr tool to compile simple file from ANTLRWorks

as seen on Stack Overflow - Search for 'Stack Overflow'
Here is the grammar file: grammar fred; test : 'fred'; Here is the batch file to launch the tool: SET JAVA_HOME=C:\Program Files\Java\jdk1.6.0_24 SET PATH=%PATH%;%JAVA_HOME%\bin SET ANTLR_HOME=c:/users/don/workspace/antlrAssign/lib/ java -cp %ANTLR_HOME%/antlr-3.3-complete.jar antlr.Tool… >>> More
Improving ANTLR DSL parse-error messages

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm working on a domain-specific language (DSL) for non-programmers. Non-programmers make a lot of grammar mistakes: they misspell keywords, they don't close parentheses, they don't terminate blocks, etc. I'm using ANTLR to generate my parser; it provides a nifty mechanism for handling RecognitionExceptions… >>> More
ANTLR - accessing token values in c/c++

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I am trying to parse integers and to access their value in antlr 3.2. I already found out how to do this in Java: //token definition INT : '0'..'9'+; //rule to access token value: start : val=INT {Integer x = Integer.valueOf( $val.text ).intValue(); } ; ... but I couldn't… >>> More
Removing Left Recursion in ANTLR

as seen on Stack Overflow - Search for 'Stack Overflow'
As is explained in http://stackoverflow.com/questions/2652060/removing-left-recursion , there are two ways to remove the left recursion. Modify the original grammar to remove the left recursion using some procedure Write the grammar originally not to have the left recursion What people normally… >>> More
Jar not found when executing class

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi there, I'm working through the ANTLR book and there are many examples that should be easy to compile using the command line. Some information to get te problem: antlr-3.2.jar contains the ANTLR classes. I added the antlr-3.2.jar to the CLASSPATH environment variable (Windows 7) and when compiling… >>> More

Developer IT

ANTLR, Dynamic variables - Developer IT

ANTLR, Dynamic variables

antlr

Related posts about antlr

Antlr question: cannot get Antlr tool to compile simple file from ANTLRWorks

Improving ANTLR DSL parse-error messages

ANTLR - accessing token values in c/c++

Removing Left Recursion in ANTLR

Jar not found when executing class

Categories cloud