PL/0编译器(java version)–PL0.java

   1:  package compiler;

   2:   

   3:  import java.io.BufferedWriter;

   4:  import java.io.FileWriter;

   5:   

   6:  /**

   7:   * 组织输入输出接口

   8:   *

   9:   * @author jiangnan

  10:   */

  11:  public class PL0 {

  12:   

  13:      

  14:      public static final String pcodeFile = "d:\\pcode.txt";

  15:      public static final String tableFile = "d:\\table.txt";

  16:      public static final String runtimeFile = "d:\\runtime.txt";

  17:      public static final String errFile = "d:\\error.txt";

  18:      public static final String inputFile="d:\\input.txt";

  19:      public static BufferedWriter pcodeWriter;                 //输出虚拟机代码

  20:      public static BufferedWriter runtimeWriter;               //输出结果

  21:      public static BufferedWriter tableWriter;                //输出名字表

  22:      public static BufferedWriter errWriter;                   //输出错误信息

  23:   

  24:      public Praser praser;

  25:   

  26:      public PL0(String filepath) {

  27:          Scanner scan = new Scanner(filepath);

  28:          praser = new Praser(scan,//词法分析器

  29:                  new SymbolTable(),//名字表

  30:                  new Interpreter());

  31:      }

  32:   

  33:      public boolean compile() {

  34:          try {

  35:              pcodeWriter = new BufferedWriter(new FileWriter(pcodeFile));

  36:              tableWriter = new BufferedWriter(new FileWriter(tableFile));

  37:              runtimeWriter = new BufferedWriter(new FileWriter(runtimeFile));

  38:              errWriter = new BufferedWriter(new FileWriter(errFile));

  39:              praser.nextsym();                                    //前瞻分析需要预先读入一个符号

  40:              praser.parse();                                        //开始语法分析过程（连同语法检查，目标代码生成）

  41:              pcodeWriter.close();

  42:              tableWriter.close();

  43:              runtimeWriter.close();

  44:              errWriter.close();

  45:          } catch (Exception e) {

  46:              e.printStackTrace();

  47:              System.out.println("***compile error***");

  48:          } finally {

  49:   

  50:          }

  51:          //编译成功是指完成编译过程并且没有错误

  52:          return (praser.myErr.errCount == 0);

  53:      }

  54:  }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }