easyscript

Easyscript is a BASIC based programming language written using PLY parsing tools for Python. It has a simple, straightforward syntax with just enough capabilites for people to use it as a first approach to programming.

Implementation

tokrules.py

This module declares the class MyLexer. It describes all the tokens and reserved words available in the language. An instance of the MyLexer class is used to build the parser.

parserules.py

This module delcares the grammar rules for the language within a class called MyParser. The functions declared contain all the translation actions for the instructions in the code. It leverages the tokens processed by the previous module.

easyscript.py

This module builds the parser for the program by declaring an instance of the MyParser class. A text document with the actual code of the program is passed as argument to this module to begin the execution. Three stages correspond to this process:

• Parsing (identify all the tokens and its semantics in the source code).
• Translating (generating the instructions to execute).
• Execution (run the program).

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Syntax

Program Structure

Variable Declaration

Assignment instruction

Arithmetic operations

Logic operations

Procedures

Conditional Statements

Loops

Dimensioned Variables

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Code Examples

Calculate the factorial of a number:

Add and Multiply Matrices: