《C语言词法分析器》开发文档及源代码

1、C语言词法分析器开发文档Powered By 萌萌的玉雪一、实验题目编制并调试C词法分析程序。二、实验目的全面深入理解高级语言程序设计知识，掌握应用技巧，提高应用与分析能力。三、主要函数void load ( ) void char_search (char *word)void main ( ) void intb_search(char *word)void scan ( ) void c_search(char *word)void inta_search(char *word) void cc_search(char *word)四、设计1.主函数 void main ( )绘制程序界

2、面调用初始化函数：void load ( ) 实现文件的建立调用主扫描函数：void scan ( ) 实现文件的扫描分析完成后指引用户查看相关文件，直到用户输入退出命令函数结束2. 初始化函数 void load ( )通过文件指针建立相关文件函数结束3. 保留字及标识符判断函数 void char_search(char *word)接收数据是否为保留字否：查标识符表是：写入输出文件没找到：写入表文件找到：写入输出文件写入输出文件4. 整数类型判断函数 void inta_search(char *word)接收数据找到：写入输出文件写入输出文件查表没找到：写入整数常量表文件5. 浮点类型

3、判断函数 void intb_search(char *word)没找到：写入整数常量表文件找到：写入输出文件查表接收数据写入输出文件6. 字符串常量判断函数 void cc_search(char *word)7. 字符常量判断函数 void c_search(char *word) 同4、5函数图8.主扫描函数 void scan ( )函数开始读入源文件中的一个单词判断宏定义忽略无效字符忽略调用保留字及标识符函数void char_search进行处理字符串字符常量调用字符常量判断函数void c_search进行处理调用字符串常量判断函数void cc_search进行处理字符串常量整

4、数常量调用整数类型判断函数void inta_search进行处理调用浮点类型判断函数void intb_search进行处理浮点数常量注释写入注释文件查运算符、分隔符表并写入输出文件限制符五、关键代码#include #include #include char *key0= ,auto,break,case,char,const,continue,default,do,double,else,enum,extern,float,for,goto,if,int,long,register,return,short,signed,sizeof,static,struct,switch,type

5、def,_Complex,_Imaginary,union,unsigned,void,volatile,while;/*保留字表*/char *key1= ,(,),;,;/*分隔符表*/char *key2= ,+,-,*,/,%,=,=,=,!=,!,&,|,|,&,=,?:,-,+,-,.,+=,-=,*=,/=;/*运算符表*/int xx035,xx110,xx231;int temp_key3=0,temp_c40=0,temp_c41=0,temp_c42=0,temp_c43=0;/* 初始化函数 */void load()int mm;for (mm=0;mm=34;mm+

6、)xx0mm=0;for (mm=0;mm=9;mm+)xx1mm=0;for (mm=0;mm=30;mm+)xx2mm=0;FILE *floading;if (floading=fopen(key0.txt,w)=NULL)printf(Error! Cant create file : key0.txt);return;fclose (floading);/*建立保留字表文件：key0.txt*/if (floading=fopen(key1.txt,w)=NULL)printf(Error! Cant create file : key1.txt);return;/*建立分隔符表文件

7、：key1.txt*/if (floading=fopen(key2.txt,w)=NULL)printf(Error! Cant create file : key2.txt);return;fclose(floading);/*建立运算符表文件：key2.txt*/if (floading=fopen(key3.txt,w)=NULL)printf(Error! Cant create file : key3.txt);return;fclose (floading);/*建立标识符表文件：key3.txt*/if (floading=fopen(c40.txt,w)=NULL)print

8、f(Error! Cant create file : c40.txt);return;fclose (floading);/*建立整数类型常量表文件：c40.txt*/if (floading=fopen(c41.txt,w)=NULL)printf(Error! Cant create file : c41.txt);return;fclose (floading);/*建立浮点类型常量表文件：c41.txt*/if (floading=fopen(c42.txt,w)=NULL)printf(Error! Cant create file : c42.txt);return;fclose

9、 (floading);/*建立字符类型常量表文件：c42.txt*/if (floading=fopen(c43.txt,w)=NULL)printf(Error! Cant create file : c43.txt);return;fclose (floading);/*建立字符串类型常量表文件：c43.txt*/ if (floading=fopen(defination.txt,w)=NULL)printf(Error! Cant create file : defination.txt);return;fclose (floading);/*建立注释文件：defination.tx

10、t*/if (floading=fopen(output.txt,w)=NULL)printf(Error! Cant create file : output.txt);return;fclose (floading);/*建立内部码文件：output.txt*/if (floading=fopen(temp_key1,w)=NULL)printf(Error! Cant create file : temp_key1);return;fclose (floading);/*建立保留字临时表文件：temp_key1*/if (floading=fopen(temp_key3,w)=NULL)

11、printf(Error! Cant create file : temp_key3);return;fclose (floading);/*建立标识符临时文件：temp_key3*/if (floading=fopen(temp_c40,w)=NULL)printf(Error! Cant create file : temp_c40);return;fclose (floading);/*建立整数类型常量临时文件：temp_c40*/if (floading=fopen(temp_c41,w)=NULL)printf(Error! Cant create file : temp_c41);

12、return;fclose (floading);/*建立浮点类型常量临时文件：temp_c41*/if (floading=fopen(temp_c42,w)=NULL)printf(Error! Cant create file : temp_c42);return;fclose (floading);/*建立字符类型常量临时文件：temp_c42*/if (floading=fopen(temp_c43,w)=NULL)printf(Error! Cant create file : temp_c43);return;fclose (floading);/*建立字符串类型常量临时文件：t

13、emp_c43*/* 保留字及标识符判断函数 */void char_search(char *word)int m,line=0,csi=0;int value=0;int value2=0;char c,cs100;FILE *foutput,*finput;for (m=1;m)chin=fgetc(fin);/*chin=fgetc(fin);*/*对空格符、水平制表符进行处理*/else if (chin= )|(chin=t);/*对回车符进行处理*/else if (chin=n);/*对单引号内的字符常量进行处理*/else if (chin=target0)if (xx19=

14、0)fout=fopen(key1.txt,a);fprintf(fout,1t9tt%cn,target0);fclose(fout);xx19=1;temp0=chin;chin=fgetc(fin);temp1=chin;chin=fgetc(fin);if (chin!=target0)temp2=chin;chin=fgetc(fin);temp3=chin;temp4=0;elsetemp2=chin;temp3=0;c_search(temp);/*对双引号内的字符串常量进行处理*/else if (chin=)int i=0;tempi+=;chin=fgetc(fin);wh

15、ile (chin!=)tempi+=chin;chin=fgetc(fin);tempi=;tempi+1=0;cc_search(temp);/*对保留字、标识符进行处理*/else if (chin=A)&(chin=a)&(chin=A)&(chin=a)&(chin=0)&(chin=0)&(chin=0)&(chin=9)|(chin=.)if (chin=.)dotcount+;if (dotcount=2)break;tempi+=chin;chin=fgetc(fin);tempi=0;if (dotcount=1)intb_search(temp);elseinta_sea

16、rch(temp);if (chin!=EOF)fseek (fin,-1L,SEEK_CUR);/*对注释进行处理*/else if (chin=/)chin=fgetc(fin);if (chin=)fout=fopen(output.txt,a);fprintf(fout,2t30tt/=n);fclose(fout);else if (chin!=*)fout=fopen(output.txt,a);fprintf(fout,2t4tt/n);fclose(fout);fseek(fin,-1L,SEEK_CUR);else if (chin=*)count=0;chin=fgetc(

17、fin);fout=fopen(defination.txt,a);fprintf(fout,/*);while (count!=2)count=0;while (chin!=*)fprintf(fout,%c,chin);chin=fgetc(fin);count+;fprintf(fout,%c,chin);chin=fgetc(fin);if (chin=/)count+;fprintf(fout,%cn,chin);elsefprintf(fout,%c,chin);chin=fgetc(fin);/*对运算符、分隔符进行处理*/elseint time=0;int firstbloo

18、d=0;temp0=chin;chin=fgetc(fin);if (chin!=EOF)temp1=chin;temp2=0;for (time=1;time=30;time+)if (strcmp(temp,key2time)=0)firstblood=1;if (xx2time=0)fout=fopen(key2.txt,a);fprintf(fout,2t%dtt%sn,time,temp);fclose(fout);xx2time=1;fout=fopen(output.txt,a);fprintf(fout,2t%dtt%sn,time,temp);fclose(fout);bre

19、ak;if (firstblood!=1)fseek(fin,-1L,SEEK_CUR);temp1=0;for (time=1;time=9;time+)if (strcmp(temp,key1time)=0)if (xx1time=0)fout=fopen(key1.txt,a);fprintf(fout,1t%dtt%sn,time,temp);fclose(fout);xx1time=1;fout=fopen(output.txt,a);fprintf(fout,1t%dtt%sn,time,temp);fclose(fout);break;for (time=1;time 查看保留字

20、表文件 *n);printf(* 1 - 查看分隔符表文件 *n);printf(* 2 - 查看运算符表文件 *n);printf(* 3 - 查看标识符表文件 *n);printf(* 4 - 查看整数类型常量表 *n);printf(* 5 - 查看浮点类型常量表 *n);printf(* 6 - 查看字符类型常量表 *n);printf(* 7 - 查看字符串类型常量表 *n);printf(* 8 - 查看注释文件 *n);printf(* 9 - 查看内部码文件 *n);printf(* - *n);printf(* Q - 退出 *n);printf(*n);printf(n);

21、load();scan();printf(n);printf(分析完成！n);getchar();printf(n);printf(请输入命令：);command=getchar();while (command!=Q)&(command!=q)switch (command)case 0:printf(*n);printf(n);fread=fopen(key0.txt,r);charin=fgetc(fread);while (charin!=EOF)putchar(charin);charin=fgetc(fread);printf(n);printf(*n);printf(n);pri

22、ntf(请输入命令：);break;case 1:printf(*n);printf(n);fread=fopen(key1.txt,r);charin=fgetc(fread);while (charin!=EOF)putchar(charin);charin=fgetc(fread);printf(n);printf(*n);printf(n);printf(请输入命令：);break;case 2:printf(*n);printf(n);fread=fopen(key2.txt,r);charin=fgetc(fread);while (charin!=EOF)putchar(charin);charin=fgetc(fread);printf(n);printf(*n);printf(n);printf(请输入命令：);break;case 3:printf(*n);printf(n);fread=fopen(key3.txt,r);charin=fgetc(fread);while (charin!=EOF)putchar(charin);charin=fgetc(fread