https://github.com/t00sh/interpret

Basic interpreter for a basic language. (totally invented :))
https://github.com/t00sh/interpret

Last synced: about 2 months ago
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Basic interpreter for a basic language. (totally invented :))

• Host: GitHub
• URL: https://github.com/t00sh/interpret
• Owner: t00sh
• License: gpl-3.0
• Created: 2014-02-06T17:32:30.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-02-06T17:54:12.000Z (over 10 years ago)
• Last Synced: 2024-01-29T06:14:10.741Z (5 months ago)
• Language: C
• Size: 148 KB
• Stars: 2
• Watchers: 1
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• AwesomeInterpreter - interpret

README

        
interpret

=========

Basic interpreter for EVAL language. (totally invented :))

### USAGE

interpret < file

### EVAL language

The language is executed line per line.

##### Loop

while(E)

	E

end

##### Test

if(E)

	E

end

##### Variable declaration + affectation

V = E

##### Function call

foo(E)

##### Comments

Starting by #

eg:

a = a+b # A comment

##### Grammar

E = expression

F = function

R = float

o = operator

V = variable

E --> if(E)

E --> while(E)

E --> end

E --> (E)

E --> F(E)

E --> V=E

E --> R

E --> V

E --> EoE

o --> [+ - / ^ * % > < <= >= == !=]{1}

V --> [A-Za-z]+

F --> [A-Za-z]+

R --> [-+]{0,1}[0-9.]+

##### Operators

* a = b -> true if a is egual b

* a > b -> true if a greater than b

* a < b -> true if a lower than b

* a ~ b -> true if a not egual to b

* a + b -> a add b

* a - b -> a sub b

* a * b -> a mul b

* a % b -> a mod b

* a / b -> a div b

* a ^ b -> a power b

##### Operators priority

* =, >, >, <, ~          ===> 1

* +,-                    ===> 2

* *,/,%                  ===> 3

* ^                      ===> 4

You can use the () for change the priority.

##### Predefined functions

print(E) ===> print the value of the expression

abs(E)   ===> calc the absolute value of the expression

sqrt(E)  ===> function sqrt

cos(E)   ===> function cos

### EXAMPLES

You can read test.txt, it's a basic program written in EVAL.

It print all prime numbers between 1 and 1000.

### TODO

- The ELSE structure : if(E) E  else  E  end

- Functions definitions : def:f(x) E end

- Multi-parameters functions

- Better errors management

- Multi-chars operators

- Multi-types (dynamic) : double, int, string, list

- Very big numbers.