# compilers

**Repository Path**: jingok/compilers

## Basic Information

- **Project Name**: compilers
- **Description**: 编译原理大作业，2015
- **Primary Language**: JavaScript
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2015-11-17
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 软件工程大作业-编译原理
实现方式:使用`Node.js`的API,使得具备了对本地文件进行读写的能力,同时也脱离了浏览器环境,可以将`绘图服务`跑在服务器上.
# 配置环境
### 安装Node.js(略)
### 安装Node-canvas
此插件依赖于`Cario`,所以在安装它之前需要安装一些依赖,大体如下,具体可以看官方文档.[链接](https://github.com/Automattic/node-canvas)
```
OS X
brew install pkg-config cairo libpng jpeg giflib
Ubuntu
sudo apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
Windows
[wiki](https://github.com/Automattic/node-canvas/wiki/Installation---Windows)
```
依赖安装好以后,执行:
```
npm install canvas
```
# 开始使用
## 1. 准备输入文件
创建demo.txt,如下所示:
```
-- 函数曲线
rot is 0;
origin is (200,500);
scale  is(2,1);
for t from 0 to 300 step 1 draw(t,0);
for t from 0 to 300 step 1 draw(0,-t);
for t from 0 to 300 step 1 draw(t,-t);
scale is (2,0.1);
for t from 0 to 55 step 0.1 draw(t,-(t*t));
scale is (10,5);
for t from 0 to 60 step 0.1 draw(t,-sqrt(t));
scale is (2,20);
for t from 0 to 300 step 0.1 draw (t,-ln(t));
scale is (20,0.1);
for t from 0 to 8 step 0.1 draw(t,-exp(t));


-- CCTV
origin is (1000,500);
scale(100,100/3);
rot is pi/2+0*pi/3;
for t from -pi to pi step pi/100 draw(cos(t),sin(t));
rot is pi/2+2*pi/3;
for t from -pi to pi step pi/100 draw(cos(t),sin(t));
rot is pi/2-2*pi/3;
for t from -pi to pi step pi/100 draw(cos(t),sin(t));
-- 波浪
origin is (1500,500);
rot is 0;
scale(50,50);
for t from 0 to 2*pi+pi/50 step pi/50 draw(t,sin(t));
origin is (1500,600);
for t from 0 to 2*pi+pi/50 step pi/50 draw(t,sin(t));
origin is (1500,700);
for t from 0 to 2*pi+pi/50 step pi/50 draw(t,sin(t));
-- 同心圆
origin is (1350, 220);
scale is (50, 50);
for t from 0 to 2*pi step pi/100 draw(cos(t), sin(t));
scale is (100, 100);
for t from 0 to 2*pi step pi/200 draw(cos(t), sin(t));

-- 呼啦圈
origin is (500,900);
scale(100,100);
rot is 0;
for t from 0 to 2*pi step pi/100 draw(cos(t),sin(t));
for t from 0 to pi*20 step pi/100 draw(   (  (1-1/(10/7)  )*cos(t)  +  1/(10/7)*cos(  -t*((10/7)-1))  )   ,((1-1/(10/7))*sin(t)+1/(10/7)*sin(-t*((10/7)-1)))   );

```

## 2.在根目录下创建`index.js`

配置options对象
* `__dirname` Node.js预置变量,表示当前目录
* `fileUrl` 输入绘图程序文件
* `img` {Object}
    * `url` 输出绘图结果文件
    * `width` 绘图输出文件宽度
    * `height` 绘图输出文件高度
* `lexLog` 如果有,则会在此目录下生成`词法分析`日志文件
* `parseLog` 如果有,则会在此目录下生成`语法分析`日志文件

```
var Compilers = require('compilers');
var options = {
    fileUrl: __dirname+'/input/demo.txt',  //必须
    img: {
        url: __dirname, //必须
        width: 2000,    //必须
        height: 2000,   //必须
        lexLog:__dirname, //可选
        parseLog:__dirname  // 可选
    }
};
Compilers.handle(options);
```

## 3. 运行

```
node index.js
```

(＾▽＾)ｺ祝贺你


![](http://7xlqsb.com1.z0.glb.clouddn.com/result.png)