Lab 11 - Grammar in ANTLR

This repository contains tasks related to grammar implementation using ANTLR.

About ANTLR

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator that can be used for a wide range of language processing tasks, including building parsers, interpreters, compilers, and more. It facilitates the creation of grammar-based tools by generating parsers for input languages.

Installation

To set up ANTLR, follow these steps:

1. Download ANTLR:

   • Download the ANTLR tool folder, named as antler in the repo.

2. Place ANTLR Folder:

   • Once downloaded, extract the contents of the ANTLR folder to a location of your choice. For instance, you might place it in the D drive (D:\antlr).

3. Set CLASSPATH System Environment Variable:

   • Create a new System Environment Variable named CLASSPATH.
   • Set its value to include the ANTLR JAR file. For example, .;D:\antlr\antlr-4.13.1-complete.jar.
     • This value includes the current directory (.) and the path to the ANTLR JAR file.

4. Update Path System Variable:

   • Edit the Path System Variable to include:
     • %CLASSPATH%
     • D:\antlr

   These additions allow Java to locate ANTLR classes and resources necessary for executing ANTLR-related commands and programs.

5. Verify Installation:

   • To verify that ANTLR is correctly installed, open a command prompt and type antlr or java org.antlr.v4.Tool. If the installation was successful, you'll see ANTLR's command-line help.

Tasks

Task 1: ANTLR Commands for Expr.g4

To execute Task 1 related to Expr.g4, follow these steps:

1. Navigate to the 'tour' directory:

   cd tour

2. Generate the lexer and parser using ANTLR for Expr.g4:

   antlr Expr.g4

3. Check the generated Java files for Expr:

   dir Expr*.java

4. Compile the generated Java files for Expr:

   javac Expr*.java

5. Run the program with the generated parser and a test input file t.expr:

   grun Expr prog -gui t.expr

Task 2: Generating Parsers with ANTLR for LabeledExpr.g4

To generate parsers using ANTLR for LabeledExpr.g4, follow these steps:

1. Change directory to calc:

   cd calc

2. Generate parser without listener and with visitor:

   antlr -no-listener -visitor LabeledExpr.g4

3. Check generated Java files:

   dir LabeledExpr*.java

4. Compile generated files with Calc.java:

   javac Calc.java LabeledExpr*.java

5. Execute the program with a test input file t.expr:

   java Calc t.expr

Follow these sequential commands to generate parsers using ANTLR for LabeledExpr.g4.

Contributors

• Muhammad Ashhub Ali
• Ahmad Zafar
• Adeel Ahmad
• Abdul Arham