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Variables

A simple example of parsing and AST building with Rust and LALRPOP

What can it do?

It can successfuly parse and execute expression evaluation, variable creation and evaluation and printing. It also has comments. An example of what the program can do is in the examples/simple file

Syntax

  • variable_name = <expression>
  • print <expression>

An expression is a simple series of mathematical of mathematical operations between constants or variables, just like in most languages. They can be evaluated to a single value. For now, all values are integers in this example.

  • Operations
    • val1 + val2: Addition
    • val1 - val2: Subtraction
    • val1 * val2: Multiplication
    • val1 / val2: Division

val1 and val2 are either initialized variables or immidiate constants, like 1, 2, 3, 4...

Building and running

To build the project you will need the Rust building system cargo. Most Linux distributions have cargo in their repositories, from which you can install the recommended version of cargo by your distribution maintainer. If however you are not using Linux or wish to install the version recomended by the cargo developers, you can follow these instructions: https://doc.rust-lang.org/cargo/getting-started/installation.html

to build the project, go the root folder of the project and run

cargo build

then again, if you wish to run the interpreter, use

cargo run <file>

replacing with the file containing the code you want the interpreter run.