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text_operations.c

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/*
 *      Copyright (c) 1989 by the Massachusetts Institute of Technology.
 *      For copying and distribution information, see the file
 *      "mit-copyright.h".
 *
 *      Modified for jwgc by Daniel Henninger.
 */

#include "mit-copyright.h"

#include "text_operations.h"
#include "char_stack.h"

string 
lany(text_ptr, str)
        string *text_ptr;
        string str;
{
        string result, whats_left;
        char *p = *text_ptr;

        while (*p && *str)
                p++, str++;

        result = string_CreateFromData(*text_ptr, p - *text_ptr);
        whats_left = string_Copy(p);
        free(*text_ptr);
        *text_ptr = whats_left;

        return (result);
}

string 
lbreak(text_ptr, set)
        string *text_ptr;
        character_class set;
{
        string result, whats_left;
        char *p = *text_ptr;

        while (*p && !set[(int) *p])
                p++;

        result = string_CreateFromData(*text_ptr, p - *text_ptr);
        whats_left = string_Copy(p);
        free(*text_ptr);
        *text_ptr = whats_left;

        return (result);
}

string 
lspan(text_ptr, set)
        string *text_ptr;
        character_class set;
{
        string result, whats_left;
        char *p = *text_ptr;

        while (*p && set[(int) *p])
                p++;

        result = string_CreateFromData(*text_ptr, p - *text_ptr);
        whats_left = string_Copy(p);
        free(*text_ptr);
        *text_ptr = whats_left;

        return (result);
}

string 
rany(text_ptr, str)
        string *text_ptr;
        string str;
{
        string result, whats_left;
        string text = *text_ptr;
        char *p = text + strlen(text);

        while (text < p && *str)
                p--, str++;

        result = string_Copy(p);
        whats_left = string_CreateFromData(text, p - text);
        free(text);
        *text_ptr = whats_left;

        return (result);
}

string 
rbreak(text_ptr, set)
        string *text_ptr;
        character_class set;
{
        string result, whats_left;
        string text = *text_ptr;
        char *p = text + strlen(text);

        while (text < p && !set[(int) p[-1]])
                p--;

        result = string_Copy(p);
        whats_left = string_CreateFromData(text, p - text);
        free(text);
        *text_ptr = whats_left;

        return (result);
}

string 
rspan(text_ptr, set)
        string *text_ptr;
        character_class set;
{
        string result, whats_left;
        string text = *text_ptr;
        char *p = text + strlen(text);

        while (text < p && set[(int) p[-1]])
                p--;

        result = string_Copy(p);
        whats_left = string_CreateFromData(text, p - text);
        free(text);
        *text_ptr = whats_left;

        return (result);
}

string 
paragraph(text_ptr, width)
        string *text_ptr;
        int width;
{
        string result;
        char *p, *back, *s, *t;

        result = string_Copy(*text_ptr);

        p = result;
        s = result;
        t = result;
        while (1) {
                if (strlen(p) > width) {
                        p = p + width;
                        t = p;
                        back = p;
                        while (*back != ' ' && *back != '\n' &&
                               *back != '\t' && back != s) {
                                back--;
                        }
                        if (back != s && *back != '\n') {
                                *back = '\n';
                        }
                        else {
                                back = t;
                                while (*back != ' ' && *back != '\n' &&
                                        *back != '\t' && *back != '\0') {
                                        back++;
                                }
                                if (*back != '\0' && *back != '\n') {
                                        *back = '\n';
                                }
                                if (*back == '\0') {
                                        break;
                                } 
                        }
                        p = back + 1;
                        if (*p == '\0') {
                                break;
                        } 
                }
                else {
                        break;
                }
        }

        return (result);
}

Last updated at Tue Dec 18 21:07:42 PST 2007.

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