电子科技大学-计算机学院-编译原理实验-词法分析

include include include define MAX COUNT 1024 define ILLEGAL CHAR ERR 1 define UNKNOWN OPERATOR ERR 2 从标准输入读入第一个非空白字符 换行符除外 char getnbc char ch ch getchar while 1 if ch r ch t ch ch getchar else break return ch 判断 character 是否为字母 bool letter char character if character a else return false 词法分析函数 每调用一次识别一个符号 bool LexAnalyze static int lineNum 1 char character char token 17 character getnbc switch character case n output EOLN 24 lineNum break case EOF output EOF 25 return false false 表示已读到文件末尾 case a case b case c case d case e case f case g case h case i case j case k case l case m case n case o case p case q case r case s case t case u case v case w case x case y case z case A case B case C case D case E case F case G case H case I case J case K case L case M case N case O case P case Q case R case S case T case U case V case W case X case Y case Z while letter character digit character char s 2 character strcat token s character getchar retract character int num num reserve token if num 0 output token num else int val val symbol output token val break case 0 case 1 case 2 case 3 case 4 case 5 case 6 case 7 case 8 case 9 while digit character char s 2 character strcat token s character getchar retract character int val val constant output token val break case output 12 break case output 13 else if character output 14 else retract character output character getchar if character output 16 else retract character output 17 break case output 18 break case output 19 break case character getchar if character output 20 else error lineNum 2 输出 未知运算符 错误 break case output 21 break case output 22 break case output 23 break default error lineNum 1 输出 出现字母表以外的非法字符 错误 return true 获得路径 void getPath char in char out char name name strrchr in if name NULL strncpy out in strlen in strlen name 1 else strcpy out 获得文件名 不包括扩展 void getFilename char in char out char fullName char extension fullName strrchr in extension strrchr in if fullName NULL strncpy out fullName 1 strlen fullName 1 strlen extension else strncpy out in strlen in strlen extension 初始化函数 接收输入文件地址 并打开输入 输出 错误文件 将标准输入重定向到输入文件 将 标准输出重定向到输出文件 标准错误重定向到错误文件 bool init int argc char argv if argc 2 return false else char inFilename argv 1 argv 1 char outFilename MAX COUNT char errFilename MAX COUNT char filename MAX COUNT char path MAX COUNT 获得文件名 不包括扩展名 和路径 getFilename inFilename filename getPath inFilename path 生成输出文件全部路径 strcat outFilename path strcat outFilename strcat outFilename filename strcat outFilename dyd 生成错误文件全部路径 strcat errFilename path strcat errFilename strcat errFilename filename strcat errFilename err if freopen inFilename r stdin NULL else