analyse.h

语法分析程序

#include <ctype.h>
#include "Keyword.h"
#include "other.h"

//Open the file
int Openfile( char* filename , char* type )
{
    //try to open the file
    FILE *fp=fopen( filename , type );
    //Check the file does exit or not
    if(!fp)
    {  
        //The file does not exit
        perror("The file does not exist!");
        return 0 ;
    }
    int Analyse( FILE* ) ; 
    //Analyse the sentence       
    Analyse(fp);
    //close the file
    fclose(fp);
    return 1 ;
}

//Analyse
int Analyse( FILE* fp )
{
    //get the character
    char getch ;
    //get the string
    char str[100] ;
    cleanstr( str , 100 ) ;

    int i=0 ;
    //Analyse
    while((getch=fgetc(fp))!=EOF )
    {
        if ( getch != 10 )
        {
            str[i] = getch ;
            i++ ;
        }
        else 
        {
            //str[i] = getch ;
            //printf("%s\n",str) ;
            
            SubAnalyse(str) ;
            
            //SubAnalyse ( str ) ;
            cleanstr( str , 100 ) ;
            i = 0 ;
        }            
    }
}

//Sub Analyse
int SubAnalyse ( char *str )
{   
    char substr[100] ;
    cleanstr( substr , 100 ) ;
    
    int si = 0 ; // i for string
    int sui = 0 ; // i for substring
    
    for( si = 0 ; str[si]!='\0' ; si++ )
    {
        //meet blank
        if( str[si]==32 )
        {
            cleanstr( substr , 100 ) ; //clean the substring
            continue ; 
        }
        //meet ;
        else if( str[si]==59 )
        {
            cleanstr( substr , 100 ) ; //clean the substring
            printf(";       特殊符号\n") ;
            continue ; 
        }
        else if( ispunct(str[si]) && str[si]!=34 )
        {
            cleanstr( substr , 100 ) ; //clean the substring
            substr[sui] = str[si] ;
            while( ispunct(str[si+1]) && str[si+1]!=32 && str[si+1]!=59 && str[si+1]!=34 )
            {
                sui++ ; si++ ;
                substr[sui] = str[si] ;
            }
            if( Operatormarks(substr) )
            {
                printf("%s      运算符号\n",substr) ;
            }
            else printf("%s     特殊符号\n",substr) ;
            sui = 0 ;
            continue ;
        }
        //meet letter
        else if( isupper(str[si]) || islower(str[si]) ) 
        {
            cleanstr( substr , 100 ) ; //clean the substring
            substr[sui] = str[si] ;
            while( isupper(str[si+1]) || islower(str[si+1]) || str[si+1]==46 )
            {
                sui++ ; si++ ;
                substr[sui] = str[si] ;
            }
            if( Keyword(substr) )
            {
                printf("%s      关键字\n",substr) ;
            }
            else printf("%s     标识符\n",substr) ;
            sui = 0 ;
            continue ;
        }
        //meet number
        else if( isdigit(str[si]) )
        {
            cleanstr( substr , 100 ) ; //clean the substring
            substr[sui] = str[si] ;
            while( isdigit(str[si+1]) || str[si+1]==46 )
            {
                sui++ ; si++ ;
                substr[sui] = str[si] ;
            }
            printf("%s   数字\n",substr) ;

            sui = 0 ;
            continue ;
        }
        // meet string ""
        else if( str[si]==34 ) 
        {
            cleanstr( substr , 100 ) ; //clean the substring
            substr[sui] = str[si] ;
            
            int change = 0 ;
            
            while( 1 )
            {
                sui++ ; si++ ;
                substr[sui] = str[si] ;
                if( change==1 ) change=0 ; //meet \
                else if( str[si]==92 ) change=1 ;
                else if( str[si]==34 ) break ;
                else continue ;
            }
            printf("%s   字符串\n",substr) ;
            sui = 0 ;
            continue ;
        }           
    }    
    return 0 ;            
}