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https://github.com/zuisong/chen_lang

A super tiny and toy language write by rust
https://github.com/zuisong/chen_lang

compiler interpreters language rust

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A super tiny and toy language write by rust

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README 

        

# chen_lang



## A tiny programming language written in [Rust](https://www.rust-lang.org)



[🇨🇳 中文版](./readme_cn.md)



---



### Sample Code



```

# This is a comment 

# Comments start with #, and go to the end of the line

# The expressions in if and for evaluate to bool

let i=1

for i<=9 {

    let j = 1

    for j<=i {

        print(j + "x" + i + "=" + i*j + " ")

        j = j + 1

    }

    println("")

    i=i+1

}

```



Output:



```

1x1=1  

1x2=2 2x2=4

1x3=3 2x3=6 3x3=9

1x4=4 2x4=8 3x4=12 4x4=16

1x5=5 2x5=10 3x5=15 4x5=20 5x5=25

1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36

1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49

1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64  

1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81

```



---



```

let i = 100

let sum = 0 

for i!=0 {

    i = i - 1

    # Here is relatively complex logical operation

    if (i%2!=0) || (i%3==0) {

        # println(i)

        # Uncomment the line above

        # Print out all odd numbers or even numbers divisible by 3

        sum = sum + i

    }

}

println("The sum of odd numbers or even numbers divisible by 3 below 100 is")  

println(sum)

```



Output:



```

The sum of odd numbers or even numbers divisible by 3 below 100 is

3316

```



---



```

# Use chen_lang to print the first 30 Fibonacci numbers 

let n = 1

let i = 1

let j = 2

println("Print the first 10 Fibonacci numbers")

for n <= 30 {

   println(i)

   let tmp = i

   i = j

   j = tmp + j

   n = n + 1 

}

```



Output:



```

Print the first 10 Fibonacci numbers

1

2

3  

5

8

13

21

34

55

89

```



---



### TODO



* [x] if condition statements

* [x] else statements

* [x] for loops

* [ ] Support break and continue keywords

* [x] bool type

* [x] int type

* [x] Arithmetic operators + - * / %

* [x] Comparison operators > >= < <= == !=

* [x] Logical operators && || !

* [x] Operator precedence

* [x] Operator precedence can be changed dynamically with parentheses

* [ ] Custom methods

* [ ] More code comments

* [ ] Write blog to document this project

* [ ] More comprehensive unit tests

* [ ] Object oriented features



---

Afterword: I finally implemented a program I've always wanted to write, thanks to the compiler principles course at Harbin Institute of Technology.