cmdline.cpp

PL/0语言的词法分析

#include <iostream.h>
#include <string.h>
#include "cmdLine.h"

void showHelp(void){
	cout<<"===PL/0编译器==="<<endl<<endl
		<<"Usage: pl0 [/l] [/c] [source] [destination]"<<endl<<endl
		<<"source\t\t要编译的文件"<<endl
		<<"destination\t编译输出的文件名"<<endl
		<<"/l\t\t输出文件中给出行号"<<endl
		<<"/c\t\t输出文件中给出列 号"<<endl;
}

bool parseCmdLine(int argc,char *argv[],CmdLine& cl){
	bool rtn=true;
	int file=2;
	bool haveSwitch=false;
	for(int i=1;i<argc;++i){
		if('/' != argv[i][0] && '-' != argv[i][0] ){
			if( false == haveSwitch ){
				switch(file){
				case 2:
					strcpy(cl.inFileName,argv[i]);
					--file;
					break;
				case 1:
					strcpy(cl.outFileName,argv[i]);
					--file;
					break;
				default:
					cout<<"多余的文件名参数:"<<argv[i]<<endl;
					rtn=false;
				}
			}else{
				if(!strcmp(argv[i], "l" )) 
					cl.showLineNum=true;
				else if(!strcmp(argv[i], "c" )) 
					cl.showColNum=true;
				else{
					cout<<"11参数格式不正确 - \""<<argv[i] <<"\"."<<endl;
					rtn=false;
				}
				haveSwitch=false;
			}
		}else if( !strcmp(argv[i], "/" ) || !strcmp(argv[i], "-" ) ){
			haveSwitch=true;
		}else {
			if(!strcmp(argv[i], "/l" ) ) cl.showLineNum=true;
			else if(!strcmp(argv[i],"/c") ) cl.showColNum=true;
			else{
				cout<<"22参数格式不正确 - \""<<argv[i]+1 <<"\"."<<endl;
				rtn=false;
			}
			haveSwitch=false;
		}
	}
	if(file>0){
		cout<<"文件的参数不够。"<<endl;
		rtn=false;
	}
	return rtn;
}

CmdLine::CmdLine()
	:showLineNum(false),
	showColNum(false)
{
	inFileName[0]=0;
	outFileName[0]=0;
}