完成单词分类

src/com/vincentbel/compiler/Symbol.java

@@ -0,0 +1,77 @@
+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;
+}