#include
#include
#include
#include
#define SPACE 0x20 //空格键
#define CHANGE 'c' //转义字符
#define STRING 'S' //引号里的字符串
#define BOUNDARY 'B' //界符
#define OPERATION 'O' //运算符
#define WORD 'I' //标识符
#define KEY_WORD 'K' //关键字
#define DIGIT 'n' //数字，包括小数
#define DOTH 'd' //头文件，“.h”文件
#define INT 't'
#define VOID 'v'
#define IF 'f'
#define ELSE 'e'
#define WHILE 'w'
#define FOR 'r'
#define MAIN 'm'
#define PRINTF 'p'
#define INCLUDE 'u'
#define FLOAT 'l'
#define KEYNUM 10
#define BOUNDNUM 8
#define OPERNUM 7
#define V ALUENUM 100
/************************************************************************/ /* data type */ /************************************************************************/ struct bianliang
{
int id;
char name[20];
int value;
};
struct changliang
{
int data;
};
KeyWord[KEYNUM][8]={"int","void","if","else","while","for","main","printf","include","float"} ;
char Boundary[BOUNDNUM]={'"',';',',','(',')','#','{','}'};
char Operation[OPERNUM]={'+','-','*','/','=','<','>'};
char
Logogram[KEYNUM]={INT,VOID,IF,ELSE,WHILE,FOR,MAIN,PRINTF,INCLUDE,FLOAT};
char Value[V ALUENUM][8];
int Value_n=0;
int ErrorLine=0;
int QuotationCount=0; //计算引号的数量
int QuotationFlag=0; //引号数量为奇数时为1，偶数时为0
char LastOpera=0; //用于判断"=="号存前一个"="号
/************************************************************************/
/* function describe */
/************************************************************************/
int isKeyWord(char* s) //是关键字返回1，否则返回0
{
int i;
for (i=0;i { if (strcmp(KeyWord[i],s)==0) { return i+1; } } return 0; } int isBoundary(char ch) //是界符 { int i; for (i=0;i { if (Boundary[i]==ch) { return i+1; } } return 0; } int isOperation(char ch) //是运算符 int i; for (i=0;i if (Operation[i]==ch) { return i+1; } } return 0; } int isDigit(char *s) //是数字{ int i,l=strlen(s); for (i=0;i { if (!isdigit(s[i])) { break; } } if (i>=l) { return 1; } else { if ('.'==s[i]) { i++; for (;i { if (!isdigit(s[i])) { break; } } } else { return 0; } if (i>=l) return 1; else return 0; } } int isDotH(char *s) //是头文件{ int i,l=strlen(s); for (i=0;i { if (!isalpha(s[i])) { break; } } if (i>=l) { return 0; } else { if ('.'==s[i]) { i++; if(s[i]=='h') return 1; else return 0; } else return 0; } } int isWord(char *s) //是标识符{ int i=0,l=strlen(s); if (isalpha(s[i])) { i++; for (;i { if (!isalnum(s[i])) { break; } } } if (i>=l) { return 1; } else return 0; } void isWhat(int *i,char *str,FILE *fileOutput,FILE *fileOutput2) //判断字符串，并把相应类型存入文件 { int n; struct bianliang temp; struct changliang t; FILE *file=fopen("num.txt","ab"); if(1!=*i) { str[--(*i)]='\0'; if(n=isKeyWord(str)) { fputs(str,fileOutput); fputc('\t',fileOutput); fputc(KEY_WORD,fileOutput); fputc('\t',fileOutput); if(isKeyWord(str)>9) fputc(isKeyWord(str)+'a'-10,fileOutput); else fputc(isKeyWord(str)+'0',fileOutput); fputc('\t',fileOutput); fputc(Logogram[n-1],fileOutput); fputc('\n',fileOutput); } else if(isWord(str)) { fputs(str,fileOutput); fputc('\t',fileOutput); fputc(WORD,fileOutput); fputc('\t',fileOutput); for(n=0;n { if(0==strcmp(Value[n],str)) break; } if(n==Value_n) { n=++Value_n; strcpy(Value[n-1],str); temp.id=n-1; strcpy(https://www.doczj.com/doc/8a5349530.html,,str); temp.value=0; fwrite(&temp,sizeof(struct bianliang),1,fileOutput2); fputc('0'+n,fileOutput); } else { fputc('0'+n+1,fileOutput); } fputc('\t',fileOutput); fputc('i',fileOutput); fputc('\n',fileOutput); } else if (isDotH(str)) { fputs(str,fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc(DOTH,fileOutput); fputc('\n',fileOutput); } else if (isDigit(str)) { fputs(str,fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc(DIGIT,fileOutput); fputc('\n',fileOutput); t.data=atoi(str); fwrite(&t,sizeof(struct changliang),1,file); } (*i)=0; } fclose(file); } void writeMessage(FILE *f) { fputs("字符\t类型\t附加值\t缩写\n",f); } void error() { printf("%d line error!\n",ErrorLine); exit(1); } /************************************************************************/ /* main */ /************************************************************************/ void main() { FILE*fileInput; FILE*fileOutput; FILE*fileOutput2; char ch,qtemp; char str[20]; int i; int flag=0; fileInput=fopen("1.cpp","r"); fileOutput=fopen("object.txt","w"); fileOutput2=fopen("variable.txt","w"); writeMessage(fileOutput); if (NULL!=fileInput) { i=0; do { ch=fgetc(fileInput); str[i++]=ch; if(isBoundary(ch)) { if(1==isBoundary(ch)) { QuotationCount++; if (0==QuotationCount%2) { QuotationFlag=0; } else QuotationFlag=1; } isWhat(&i,str,fileOutput,fileOutput2); fputc(ch,fileOutput); fputc('\t',fileOutput); fputc('B',fileOutput); fputc('\t',fileOutput); if(isBoundary(ch)>9) fputc(isBoundary(ch)+'a'-10,fileOutput); else fputc(isBoundary(ch)+'0',fileOutput); fputc('\t',fileOutput); fputc(Boundary[isBoundary(ch)-1],fileOutput); fputc('\n',fileOutput); i=0; } else if(isOperation(ch)) { if(0==QuotationCount%2) { isWhat(&i,str,fileOutput,fileOutput2); if ('='==ch) { qtemp=fgetc(fileInput); if ('='==qtemp) { fputc('=',fileOutput); fputc('=',fileOutput); flag=1; } else { fputc('=',fileOutput); fseek(fileInput,-1,SEEK_CUR); flag=0; } } else fputc(ch,fileOutput); fputc('\t',fileOutput); fputc(OPERA TION,fileOutput); fputc('\t',fileOutput); if(isOperation(ch)>9) fputc(isOperation(ch)+'a'-10,fileOutput); else fputc(isOperation(ch)+'0',fileOutput); fputc('\t',fileOutput); if (flag) { fputc('q',fileOutput); } else fputc(Operation[isOperation(ch)-1],fileOutput); fputc('\n',fileOutput); i=0; } else { fputc(ch,fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('c',fileOutput); fputc('\n',fileOutput); i=0; } } else if('\n'==ch) { isWhat(&i,str,fileOutput,fileOutput2); ErrorLine++; i=0; } else if(SPACE==ch||'\t'==ch) { if(1 isWhat(&i,str,fileOutput,fileOutput2); else i=0; } else if ('\\'==ch) { if (1==QuotationFlag) { if (1!=i) { str[--i]='\0'; fputs(str,fileOutput); fputc('\t',fileOutput); fputc(STRING,fileOutput); fputc('\n',fileOutput); i=0; } ch=fgetc(fileInput); if ('t'==ch) { fputc('\\',fileOutput); fputc('t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc(CHANGE,fileOutput); fputc('\n',fileOutput); i=0; } else if('b'==ch) { fputc('\\',fileOutput); fputc('b',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc(CHANGE,fileOutput); fputc('\n',fileOutput); } else if ('n'==ch) { fputc('\\',fileOutput); fputc('b',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc('\t',fileOutput); fputc(CHANGE,fileOutput); fputc('\n',fileOutput); i=0; } } else error(); } else if (1==QuotationFlag) { continue; } else if (isalnum(ch)||ch=='.') { } else if (EOF!=ch) { error(); } }while(EOF!=ch); printf("词法分析完毕\n"); fclose(fileInput); } fclose(fileOutput); fclose(fileOutput2); } /****************************************************/ /* 1.cpp 例子文件*/ #include { int i; int j; int m; m=1; for(i=0;i<5;i=i+1) { printf("\t",i); for(j=0;j printf("\b",i); } for(j=0;j printf("*",i); } printf("\n",i); m=m+2; } }
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