//這是詞法分析程序lexical.h
#include "stdlib.h"
#include "stdio.h"
#include "iomanip.h"
#include "getchar.h"
#include "check.h"
#include "LinkedList.h"
#include "filelist.h"
#include "Error.h"

const MAXPATHLEN=30;                         //規定源文件路徑的最大長度
//定義三個全局鏈表類,類定義包含在LinkedList.h文件中
LinkedList<word> varlist;                   //全局鏈表用來存放變量
LinkedList<word> symbolist;                 //存放符號
LinkedList<word> wordlist;                  //存放整個程序的單詞
//定義一個二維數組存放各單詞名
//char name[5][10]={"KEYWORD","VARIABLE","CONST","SYMBOL","ERRORSYM"}
void lexical()
{	
	//找到源文件所在的位置
	ifstream sourfile[MAXPATHLEN];
	cout<<"please input the path of the source file:";
	//將文件路徑保存在filename中
	char filename[MAXPATHLEN];
	cin.getline(filename,MAXPATHLEN);
	cout<<endl;
	
	int i=0;
	sourfile[0].open(filename,ios::in|ios::nocreate);
	//如果第一次打開文件不成功,提供重新輸入機會和退出選擇
	while(!sourfile[i])
	{
		i++;
		cout<<"file can't be open,input once more,input exit to exit:";
		char* fp=filename;
		cin.getline(fp,MAXPATHLEN);
		cout<<endl;
		if(!strcmp(filename,"exit")) exit(0);
		sourfile[i].open(filename,ios::in|ios::nocreate);
	}
	//為了確定文件取單詞時的循環次數,讀一遍文件確定行數
	char s;
	int countline=1;           //放置源文件行數
	while(!sourfile[i].eof())
	{	
		sourfile[i].get(s);
		if(s==0xA)   countline++;
		if(!s) break;	
	}
	sourfile[i].close();
	//重新打開文件進行取單詞,并對單詞進行相應判斷操作
	ifstream newsour;
	newsour.open(filename,ios::in|ios::nocreate);
	int err=0;        //記錄錯誤單詞數

	while(w.line!=countline&&!newsour.eof())
	{
		//將文件中字符流分成一個個單詞流,包含在getchar.h頭文件中
		getword(w,newsour);                 
		//如果是注釋信息,則跳過注釋
		if(!strcmp(w.ch,"/*"))	             
		{
			getword(w,newsour);
			while(strcmp(w.ch,"*/")&&w.line!=countline)
			{getword(w,newsour);}
			getword(w,newsour);
		}
		if(!strcmp(w.ch,"//"))
		{
			int l=w.line;
			getword(w,newsour);
			while(w.line==l)
			{getword(w,newsour);}
		}
		if(!strcmp(w.ch,"