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refactor the code to search for the beginning of a paragraph a bit to

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fix some inaccuracies and eliminate the need for recursion; it now uses
almost the same logic as the code to search for the end of a paragraph,
which makes it somewhat easier to understand


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1823 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
This commit is contained in:
David Lawrence Ramsey 2004-06-27 00:54:08 +00:00
parent 524534405b
commit dbde9d7577
2 changed files with 67 additions and 60 deletions
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4
ChangeLog
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@ -182,6 +182,10 @@ CVS code -
- Remove unneeded edit_update() calls. (David Benbennick)
- Convert to use an enum to specify the search type: JUSTIFY,
BEGIN, or END. (DLR)
- Refactor to properly do searches for beginnings of paragraphs
in the same way as searches for endings of paragraphs, without
needing the old (and somewhat inaccurate) recursive approach.
(DLR)
do_justify()
- Remove unneeded edit_update() calls, and add a few minor
efficiency tweaks. (David Benbennick)

107
src/nano.c
View File

@ -2177,9 +2177,6 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
/* Generic indentation length. */
filestruct *line;
/* Generic line of text. */
static int do_restart = 1;
/* Whether we're restarting when searching for the beginning
* line of the paragraph. */
#ifdef HAVE_REGEX_H
regex_t qreg; /* qreg is the compiled quotation regexp. We no
@ -2202,14 +2199,14 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
current_x = 0;
restart_para_search:
/* Here we find the first line of the paragraph to search. If the
* current line is in a paragraph, then we move back to the first
* line. Otherwise, we move to the first line that is in a
* paragraph. */
quote_len = quote_length(IFREG(current->data, &qreg));
indent_len = indent_length(current->data + quote_len);
/* Here we find the last or first line of the paragraph to search.
* If the current line is in a paragraph, then we move back to the
* first line of the paragraph. Otherwise, we move to the last or
* first line that is in a paragraph. */
start_para_search:
if (current->data[quote_len + indent_len] != '\0') {
/* This line is part of a paragraph. So we must search back to
* the first line of this paragraph. First we check items 1)
@ -2234,9 +2231,21 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
current = current->prev;
current_y--;
}
/* If we're searching for the beginning of the paragraph,
* we're not on the first line of the file, and we're on the
* same line we started on, move up one line and search
* again, so that we end up on the first line of the previous
* paragraph. */
if (search_type == BEGIN && current->prev != NULL &&
current == current_save) {
current = current->prev;
current_y--;
goto start_para_search;
}
} else if (search_type == BEGIN) {
/* This line is not part of a paragraph. Move up until we get
* to a non "blank" line, and then move down once. */
* to a non "blank" line. */
do {
/* There is no previous paragraph, so nothing to move to. */
if (current->prev == NULL) {
@ -2244,7 +2253,6 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
if (do_refresh)
edit_redraw(current_save, old_pww);
#ifdef HAVE_REGEX_H
if (!do_restart)
regfree(&qreg);
#endif
return 1;
@ -2254,7 +2262,6 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
quote_len = quote_length(IFREG(current->data, &qreg));
indent_len = indent_length(current->data + quote_len);
} while (current->data[quote_len + indent_len] == '\0');
current = current->next;
} else {
/* This line is not part of a paragraph. Move down until we get
* to a non "blank" line. */
@ -2276,8 +2283,9 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
} while (current->data[quote_len + indent_len] == '\0');
}
/* Now current is the first line of the paragraph, and quote_len is
* the quotation length of that line. */
/* Now current is the last line in the paragraph if we're searching
* for the beginning of it or the first line of the paragraph
* otherwise, and quote_len is the quotation length of that line. */
/* Next step, compute par_len, the number of lines in this
* paragraph. */
@ -2285,9 +2293,30 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
par_len = 1;
indent_len = indent_length(line->data + quote_len);
while (line->next != NULL && quotes_match(current->data, quote_len,
IFREG(line->next->data, &qreg))) {
size_t temp_id_len = indent_length(line->next->data + quote_len);
if (search_type == BEGIN) {
while (line->prev != NULL && quotes_match(current->data,
quote_len, IFREG(line->prev->data, &qreg))) {
size_t temp_id_len = indent_length(line->prev->data +
quote_len);
if (!indents_match(line->data + quote_len, indent_len,
line->prev->data + quote_len, temp_id_len) ||
line->prev->data[quote_len + temp_id_len] == '\0' ||
(quote_len == 0 && temp_id_len > 0
#ifndef NANO_SMALL
&& !ISSET(AUTOINDENT)
#endif
))
break;
indent_len = temp_id_len;
line = line->prev;
par_len++;
}
} else {
while (line->next != NULL && quotes_match(current->data,
quote_len, IFREG(line->next->data, &qreg))) {
size_t temp_id_len = indent_length(line->next->data +
quote_len);
if (!indents_match(line->data + quote_len, indent_len,
line->next->data + quote_len, temp_id_len) ||
@ -2302,39 +2331,6 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
line = line->next;
par_len++;
}
if (search_type == BEGIN) {
/* We're on the same line we started on. Move up until we get
* to a non-"blank" line, restart the search from there until we
* find a line that's part of a paragraph, and search once more
* so that we end up at the beginning of that paragraph. */
if (current != fileage && current == current_save && do_restart) {
while (current->prev != NULL) {
size_t i, j = 0;
current = current->prev;
current_y--;
/* Skip over lines consisting only of spacing
* characters, as searching for the end of the paragraph
* does. */
for (i = 0; current->data[i] != '\0'; i++) {
if (isblank(current->data[i]))
j++;
else {
i = 0;
j = 1;
break;
}
}
if (i != j && strlen(current->data) >=
(quote_len + indent_len) &&
current->data[quote_len + indent_len] != '\0') {
do_restart = 0;
break;
}
}
goto restart_para_search;
} else
do_restart = 1;
}
#ifdef HAVE_REGEX_H
@ -2345,9 +2341,16 @@ int do_para_search(justbegend search_type, size_t *quote, size_t *par,
/* Now par_len is the number of lines in this paragraph. We should
* never call quotes_match() or quote_length() again. */
/* If we're searching for the end of the paragraph, move down the
* number of lines in the paragraph. */
if (search_type == END) {
/* If we're searching for the beginning of the paragraph, move up
* the number of lines in the paragraph minus one, since we want to
* end up on the first line of the paragraph. If we're searching
* for the end of the paragraph, move down the number of lines in
* the paragraph, since we want to end up on the line after the
* last line of the paragraph. */
if (search_type == BEGIN) {
for (; par_len > 1; current_y--, par_len--)
current = current->prev;
} else if (search_type == END) {
for (; par_len > 0; current_y++, par_len--)
current = current->next;
}