symbol.java

SkipOOMiniJOOL教学语言的编译器前端

package edu.ustc.cs.minijool.lexer;

/**
 * 词法记号类，为了方便你的词法分析器的生成，大部分已经通过静态变量给出，
 * 如果您需要或者希望加入新的词法符号，请按形如下面的方式添加
 * "public static int /symbolname/=counter++;"
 */
public class Symbol {
	public static int counter = 0;
	
	public static final int IGNORE = counter++;//需要忽略的字符

	public static final int IDENTIFIER = counter++;//标识符
	public static final int INTEGER_LITERAL = counter++;//整数常量
	
	
	
	
	public static final int PLUS = counter++;// +
	public static final int MINUS = counter++;// -
	public static final int MULT = counter++;// *
	public static final int DIV = counter++;// /
	public static final int LPAREN = counter++;// (
	public static final int RPAREN = counter++;// )
	public static final int EQ = counter++;// =
	public static final int SEMICOLON = counter++;// ;

	public static final int EOF = counter++;//文件结尾符
	
	
	//	added by myself
	public static final int WHILE=counter++;
	public static final int RSHIFT=counter++;
	public static final int OROR=counter++;
	public static final int BOOLEAN=counter++;
	public static final int NOT=counter++;
	public static final int NOTEQ=counter++;
	public static final int COMMA=counter++;
	public static final int MOD=counter++;
	public static final int LBRACE=counter++;
	public static final int GTEQ=counter++;
	public static final int CLASS=counter++;//22
	public static final int STRING_LITERAL=counter++;
	public static final int MINUSEQ=counter++;
	public static final int RETURN=counter++;
	public static final int PERIOD=counter++;
	public static final int LSHIFT=counter++;
	public static final int IF=counter++;
	public static final int LSHIFTEQ=counter++;
	public static final int DIVEQ=counter++;
	public static final int MULTEQ=counter++;
	public static final int VOID=counter++;
	public static final int MODEQ=counter++;
	public static final int ELSE=counter++;
	public static final int STATIC=counter++;
	public static final int EXTENDS=counter++;
	public static final int PLUSEQ=counter++;
	public static final int THIS=counter++;
	public static final int NEW=counter++;
	public static final int RBRACE=counter++;
	public static final int RSHIFTEQ=counter++;
	public static final int ANDAND=counter++;
	public static final int LTEQ=counter++;
	public static final int GT=counter++;
	public static final int NULL=counter++;
	public static final int BOOLEAN_LITERAL=counter++;
	public static final int EQEQ=counter++;
	public static final int PRINT=counter++;
	public static final int INT=counter++;
	public static final int LT=counter++;
		
	
	
	
	private int type;
	private String token;
	private int line, column;

	public Symbol(int type, String token, int line, int column) {
		this.type = type;
		this.token = token;
		this.line = line;
		this.column = column;
	}
	
	public Symbol(int type,String token){
		this.type=type;
		this.token=token;
	}
	
	public Symbol(Symbol sym) {
		this.type = sym.type;
		this.token = sym.token;
		this.line = sym.line;
		this.column = sym.column;
	}
	
	public int getType() {
		return type;
	}

	public String toString() {
		return type + " " + token + "   (" + line + ", " + column + ")";
	}

	public String getLexeme(){
		return token;
	}
}