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https://github.com/iambrj/cathy
An interpreter for a simple programming language
https://github.com/iambrj/cathy
Last synced: 3 months ago
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An interpreter for a simple programming language
- Host: GitHub
- URL: https://github.com/iambrj/cathy
- Owner: iambrj
- License: mit
- Created: 2019-03-02T10:42:25.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2019-03-24T11:43:12.000Z (over 5 years ago)
- Last Synced: 2024-04-24T16:14:54.062Z (7 months ago)
- Language: C
- Homepage:
- Size: 24.4 KB
- Stars: 1
- Watchers: 2
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- AwesomeInterpreter - cathy
README
# Cathy
A simple programming langauge.
## Features currently implemented
- User defined functions (through let binding)
- User defined variables
- Control structures - while, if-then-else
- Lists
- Integer arithmetic
- Real arithmetic
- Operator precedence
- Associativity of operators
- Parenthesization of expressions
## Ideas for future
- Polymorphism
- Subtyping
- Universal types
- Exception handling system
- General recursion
- New datatypes - tuples, sums, variants, records
- Syntactic sugar to implement for structure
- Hexadecimal arithmetic
- Case structure
- Bit manipulation
## Installation
To install cathy, first install gcc, flex and bison. Most Linux distributions come with these installed. If yours doesn't, use the package manager to install them.
On Arch Linux,
```
sudo pacman -S gcc flex bison
```
Next clone (or download as a .zip file using button above) the repository.
```
git clone https://github.com/iambrj/cathy
cd cathy
```
Install and run cathy
```
make
make clean # to remove temporary files generated
./cathy
```
## Syntax
Identifiers for varible begin with an alphabet (lowercase or uppercase). Values for variables can be assigned using `=` operator.
```
> a = 3
= 3
> b = 4
= 4
> a + b
= 7
```
`if-then-else` block works as follows
```
> if a > b then a; else b;
= 4
```
Note the use of `;` to end `then` and `else`
Functions can be defined using `let`. Example
```
> let square(a) = a * a;
Defined square
```
Note that function declarations must be terminated by a `;`