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Os tópicos devem começar com uma letra ou um número, podem incluir traços ('-') e podem ter até 35 caracteres.
151 linhas
4.5 KiB
151 linhas
4.5 KiB
#include <stdio.h>
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#include <stdlib.h>
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void setBit(char *bits, int n)
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{
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bits[n/8] |= (1 << n%8);
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}
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int testBit(char *bits, int n)
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{
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return bits[n/8] & (1 << n%8);
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}
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int isEscapedChar(char char1, char char2){
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if( char1=='\n'){
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return 10;
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}
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if( char1=='\a'){
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return 7;
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}
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if( char1=='\b'){
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return 8;
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}
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if( char1=='\e'){
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return 27;
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}
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if( char1=='\f'){
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return 12;
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}
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if( char1=='\r'){
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return 13;
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}
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else if( char1=='\t'){
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return 9;
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}
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if( char1=='\v'){
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return 1;
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}
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else if( char1=='\\' && char2=='-'){
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return 45;
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}
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else if ( char1=='\\'){
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return 92;
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}
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else return ;
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//if(character==92 || character==7 || character==8 || character==27 || character==12 || character==10 || character==13 || character==13
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// || character==9 || character==11)
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}
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char *classify(char *spec)
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{
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char *class= malloc(32); // 256 bits indicating if character N (bit position N) is in the class or not
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int index=0;
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while (spec[index] != '\0' ) { //*spec
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// go through spec converting each entry in the spec into a set of bits in the class
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// test if the next thing is \ .
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// or test if you have X-Y (where X or Y might be a character or escaped character)
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// \n-\r
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if (spec[index]=='-' && index!=0 && !(index==1 && spec[0]=='^') && spec[index+1]!='\0'){
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if(spec[index-1]<65 || spec[index+1]>122 || (spec[index-1]>90 && spec[index-1]<97) || (spec[index+1]>90 && spec[index+1]<97)){
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//= if(spec[index-1] or spec[index+1] are not letters)
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if((spec[index-1]>47 && spec[index-1]<57) || (spec[index+1]>47 && spec[index+1]<57) ){ //if it's a digit range
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if(spec[index-1]>spec[index+1]){
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printf("Error, first digit greater than the second one\n");
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}
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else{
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for(int j=spec[index-1]; j<=spec[index+1] ; j++){
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setBit(class,j);
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printf("added digit : %c\n",j);
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}
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index++;
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}
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}
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else{
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printf("Error, bad use of range");
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exit(1);
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}
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}
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else{
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if(spec[index-1]>spec[index+1]){
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printf("Error, first char greater than the second one\n");
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exit(1);
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}
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else if(spec[index-1]>=65 && spec[index-1]<=90 && spec[index+1]>=65 && spec[index+1]<=90 ){
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for(int j=spec[index-1]; j<=spec[index+1] ; j++){
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setBit(class,j);
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printf("added char : %c\n",j);
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}
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index++;
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}
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else if( spec[index-1]>=97 && spec[index-1]<=122 && spec[index+1]>=97 && spec[index+1]<=122 ){
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for(int j=spec[index-1]; j<=spec[index+1] ; j++){
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setBit(class,j);
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printf("added char : %c\n",j);
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}
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index++;
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}
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else{
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printf("Bad use of char range");
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exit(1);
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}
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}
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}
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else if((spec[index]>=65 && spec[index]<=90) || (spec[index]>=97 && spec[index]<=122)){
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setBit(class,spec[index]);
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printf("added char : %c\n",spec[index]);
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}
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else if(isEscapedChar(spec[index],spec[index+1])!=0){
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if(isEscapedChar(spec[index],spec[index+1])==45){
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index++;
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}
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setBit(class,isEscapedChar(spec[index],spec[index+1]));
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}
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printf("%c\n",spec[index]);
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printf("%i\n",index);
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index++;
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}
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if (spec[0]=="^") {
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for (int i= 0; i < 8; ++i) class[i] ^= 255; // invert all bits in the class
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}
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return class;
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}
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int main()
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{
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char *line=0;
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size_t line_max=0;
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ssize_t line_len=0;
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char a='a';
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printf("%i\n",(int)a);
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printf("%s",classify("fgmfa\\-c"));
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while ((line_len= getline(&line,&line_max,stdin)) >= 0) {
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if (line_len>0 && line[line_len-1]=='\n') {
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line[line_len-1]=0;
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}
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char *class= classify(line);
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for (int i= 0; i < 256; ++i)
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if (testBit(class, i))
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printf("%02x is set\n", i);
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}
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return 0;
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}
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