Clean all spaces and newlines C or Lex/Bison

Question

I need to clean all spaces and newlines (\\n) of the yytext on my Lex/Bison program.

I have a proprierty like this:

<PROPERTY>[^}]* TAG=yytext;

I need it to parse all my CSS code file into the HTML tags.

I tried something like this:

sizeOfArray=strlen(TAG);
int i;
for(i=0; i<sizeOfArray; i++){
    memmove(TAG,TAG+1,len);
}

Without success...

EDIT:

I only want clean the spaces before the property and after it.

example:

 body {
         background: black;
         color: #80c0c0
         }

Because I want put this lines on my HTML file, to be something like this:

<body style="background:black; color:#80c0c0;">

Answer 1

Untested, but if isspace() from <ctype.h> matches the characters (blanks, tabs, newlines) that you want to skip, this should work:

int sizeOfArray = strlen(TAG);
int i, j;
for (i = j = 0; i < sizeOfArray; i++)
{
    if (!isspace(TAG[i]))
        TAG[j++] = TAG[i];
}
TAG[j] = '\0';

As discussed in the comments, this code should implement 'for each sequence of one or more newlines or spaces, preserve a single space; copy other characters through unchanged', again assuming isspace() is a suitable function — there's also isblank() , for example, in the Standard C library.

int sizeOfArray = strlen(TAG);
int i, j;
for (i = j = 0; i < sizeOfArray; i++)
{
    if (isspace(TAG[i]))
    {
        while (i < sizeOfArray && isspace(TAG[i]))
            i++;
        if (TAG[i] != '\0')
            TAG[j++] = ' ';
    }
    TAG[j++] = TAG[i];
}
TAG[j] = '\0';

Now tested with this SSCCE ( Short, Self-Contained, Correct Example ):

#include <ctype.h>
#include <stdio.h>
#include <string.h>

static void squish_whitespace(char *TAG)
{
    int sizeOfArray = strlen(TAG);
    int i, j;
    for (i = j = 0; i < sizeOfArray; i++)
    {
        if (isspace(TAG[i]))
        {
            while (i < sizeOfArray && isspace(TAG[i]))
                i++;
            if (TAG[i] != '\0')
                TAG[j++] = ' ';
        }
        TAG[j++] = TAG[i];
    }
    TAG[j] = '\0';
}

int main(void)
{
    char data[][80] =
    {
        "abc def ghi",
        "abc  def   \t\t\n\nghi",
        "abc  def  ghi   ",
        "body {\n"                        // NB: string concatenation
        "        background: black;\n"
        "        color: #80c0c0\n"
        "     }"
    };
    enum { NUM_DATA = sizeof(data) / sizeof(data[0]) };

    for (size_t i = 0; i < NUM_DATA; i++)
    {
        printf("Before: [[%s]]\n", data[i]);
        squish_whitespace(data[i]);
        printf("After:  [[%s]]\n", data[i]);
    }
    return 0;
}

Output from test data:

Before: [[abc def ghi]]
After:  [[abc def ghi]]
Before: [[abc  def          

ghi]]
After:  [[abc def ghi]]
Before: [[abc  def  ghi   ]]
After:  [[abc def ghi]]
Before: [[body {
        background: black;
        color: #80c0c0
     }]]
After:  [[body { background: black; color: #80c0c0 }]]

Clean all spaces and newlines C or Lex/Bison

Question

1 answers

solution1
1 ACCPTED 2013-04-21 21:43:23

Clean all spaces and newlines C or Lex/Bison

Question

1 answers

solution1 1 ACCPTED 2013-04-21 21:43:23

solution1
1 ACCPTED 2013-04-21 21:43:23