matchkeywords.h

一个简单的词法分析程序。是编译原理的部分课程设计。因为时间有限。未能完成全部。如果有朋友改了代码或添加了功能使代码更加完善。请与我联系：[e-mail]谢谢. 做的不是

/*=============================================
**             2005-8-22					**
**			  匹配关键字					**
**			 lizhu zhang					**
=============================================*/
#include <string.h>
#include "biaoshifu.h"
#include "integer.h"
#include "realint.h"
#include "RealCharInt.h"
#include "JieXianFu.h"
//关键字数组
char keyWords[][15]={"and","array","begain","bool","call","case","char","constant","do",
					"else","end","false","for","if","input","integer","not","of","or",
					"output","procedure","program","read","real","repeat","set","then",
					"to","true","until","var","while","write"};
/*============================================
**参数说明：								
**			[in]pword   :输入要查找的信息
**			[out]pErrMsg:返回出错信息
**			[out]col    :返回出错列
**返回值:如果找到,返回种别码,否则返回出错列值+61
===============================================*/
int FFindKind(const char *pWord,char *pErrMsg,int &col)
{
	//接受函数返回值,然后根据其判断函数操作状况.
	int rW =0;
	//返回值临时变量
	int kind=0;
	int i=0;
	//将大写字母变成小小写字母
	char word[2048];
	strcpy(word,pWord);
	strcpy(word,strlwr(word));
	//识别关键字
	for(;i<=32;i++)
	{		
		if(strcmp(word,&keyWords[i][0])==0)
		{ 
			kind = i+1;
			return kind;
		}
	}
	//识别界限符
	kind = FJieXianFu(word);
	//找到则返回种别码，否则继续以下的匹配
	if(kind != 0)
		return kind;
	//=================================
	//识别标识符
	kind = FBiaoShiFu(word);
	if(kind != -1)
		return kind;
	//=================================
	//识别整常数
	rW = FInt(word);
	if(rW == 0)
	{
		kind = 35;
		//成功
		return kind;
	}
	else
		if(rW == 1)
		{
			//其他
			;
		}
		else
		{
			//错误的整常数,可能为实常数
			//===================================
			//识别实常数
			rW = FRealInt(word);
			//识别成功
			if(rW == 0)
			{
				kind = 36;
				return kind;
			}
			else
			{
				strcpy(pErrMsg,word);
				strcat(pErrMsg,"  错误!");
				return rW+61;
			}
		}
	//===================================
	//识别实符常数
		rW = FRealCharInt(word);
		if(rW == 0 )
		{
			kind = 37;
			return kind;
		}
		else
			if(rW == -1)
				return rW;
			else
			{
				strcpy(pErrMsg,"“ ");
				strcat(pErrMsg,word);
				strcat(pErrMsg," ” 错误!");
				return rW+61;
			}
		cout<<"Test FRealCharInt pos:"<<kind<<endl;
	//===================================
}