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完成单词分类

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VincentBel committed Jan 10, 2015
1 parent 6bb2896 commit 61970b58ab96ec3e1543ba448e784381745cc5fb
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  1. +77 −0 src/com/vincentbel/compiler/Symbol.java
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package com.vincentbel.compiler;

/**
* Author: VincentBel
* Create at: 2015/1/10.
*/
public class Symbol {


public static final int SYMBOL_NUMBER = 35; // 单词的总数
public static final int NUMBER_MAX = 1000000; // PL/0中允许的无符号整数的最大值



/**------------------------------------
* 分界符或操作符
* . , ; = := + - ( ) * / <> < <= > > >=
* -------------------------------------
*/
public static final int NUL = 0; // NULL
public static final int PLUS = 1; // 加号+
public static final int MINUS = 2; // 减号-
public static final int MULTIPLY = 3; // 乘号*
public static final int DIVIDE = 4; // 除号/
public static final int EQUAL = 5; // 等于号=(equal)
public static final int NOT_EQUAL = 6; // 不等于<>(not equal)
public static final int LESS = 7; // 小于<(less)
public static final int LESS_OR_EQUAL = 8; // 小于等于<=(less or equal)
public static final int GREATER = 9; // 大于>(greater)
public static final int GREATER_OR_EQUAL = 10; // 大于等于>=(greater or equal)
public static final int LEFT_PARENTHESIS = 11; // 左括号(
public static final int RIGHT_PARENTHESIS = 12; // 右括号 )
public static final int COMMA = 13; // 逗号,
public static final int SEMICOLON = 14; // 分号;
public static final int PERIOD = 15; // 句号.
public static final int BECOMES = 16; // 赋值符号 :=


/**------------------------------------
* 标识符 <标识符> ::= <字母>{<字母>|<数字>}
* -------------------------------------
*/
public static final int IDENTIFIER = 17;


/**------------------------------------
* 常数中只有无符号整数 <无符号整数> ::= <数字>{<数字>}
* -------------------------------------
*/
public static final int NUMBER = 18;


/**------------------------------------
* 保留字
* const, var, procedure, odd,
* if, then, else, while,
* do, call, begin, end,
* repeat, until, read, write
* -------------------------------------
*/
public static final int CONST_SYMBOL = 19;
public static final int VAR_SYMBOL = 20;
public static final int PROCEDURE_SYMBOL = 21;
public static final int ODD_SYMBOL = 22;
public static final int IF_SYMBOL = 23;
public static final int THEN_SYMBOL = 24;
public static final int ELSE_SYMBOL = 25;
public static final int WHILE_SYMBOL = 26;
public static final int DO_SYMBOL = 27;
public static final int CALL_SYMBOL = 28;
public static final int BEGIN_SYMBOL = 29;
public static final int END_SYMBOL = 30;
public static final int REPEAT_SYMBOL = 31;
public static final int UNTIL_SYMBOL = 32;
public static final int READ_SYMBOL = 33;
public static final int WRITE_SYMBOL = 34;
}

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