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decouple the paragraph searching code and the justification code 

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1670 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
master
David Lawrence Ramsey 2004-02-27 18:54:04 +00:00
parent 95b7bdbdb0
commit 281e0563c6
3 changed files with 260 additions and 232 deletions
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3
ChangeLog
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@ -20,6 +20,9 @@ CVS code -
waiting for input from the user. New function
allow_pending_sigwinch(); changes to signal_init(),
get_kbinput(), and get_verbatim_kbinput(). (DLR)
- Decouple the paragraph searching code and the justifying code.
Removed function do_para_operation(); new function
do_para_search(); changes to do_justify(). (DLR)
- files.c:
add_open_files()
- Make the saving of marked status in open_files->file_flags

480
src/nano.c
View File

@ -2193,16 +2193,19 @@ int break_line(const char *line, int goal, int force)
return space_loc;
}
/* This function performs operations on paragraphs: justify, go to
* beginning, and go to end. */
int do_para_operation(int operation)
{
/* operation == 0 means we're justifying the paragraph, operation == 1
* means we're moving to the beginning line of the paragraph, and
* operation == 2 means we're moving to the ending line of the
/* Search a paragraph. If search_type is 0, search for the beginning of
* the current paragraph or, if we're at the end of it, the beginning of
* the next paragraph. If search_type is 1, search for the beginning of
* the current paragraph or, if we're already there, the beginning of
* the previous paragraph. If search_type is 2, search for the end of
* the current paragraph or, if we're already there, the end of the next
* paragraph. Afterwards, save the quote length, paragraph length, and
* indentation length in *quote, *par, and *indent if they aren't NULL,
* and refresh the screen if do_refresh is nonzero. Return 0 if we
* found a paragraph, or 1 if there was an error or we didn't find a
* paragraph.
*
* To explain the justifying algorithm, I first need to define some
* To explain the searching algorithm, I first need to define some
* phrases about paragraphs and quotation:
* A line of text consists of a "quote part", followed by an
* "indentation part", followed by text. The functions quote_length()
@ -2229,7 +2232,239 @@ int do_para_operation(int operation)
* A contiguous set of lines is a "paragraph" if each line is part of
* a paragraph and only the first line is the beginning of a
* paragraph. */
int do_para_search(int search_type, size_t *quote, size_t *par, size_t
*indent, int do_refresh)
{
size_t quote_len;
/* Length of the initial quotation of the paragraph we
* search. */
size_t par_len;
/* Number of lines in that paragraph. */
/* We save this global variable to see if we're where we started
* when searching for the beginning of the paragraph. */
filestruct *current_save = current;
size_t indent_len; /* 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
* longer care about quotestr. */
int rc = regcomp(&qreg, quotestr, REG_EXTENDED);
if (rc != 0) {
size_t size = regerror(rc, &qreg, NULL, 0);
char *strerror = charalloc(size);
regerror(rc, &qreg, strerror, size);
statusbar(_("Bad quote string %s: %s"), quotestr, strerror);
free(strerror);
return 1;
}
#endif
/* Here is an assumption that is always true anyway. */
assert(current != NULL);
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);
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)
* and 3) above. */
while (current->prev != NULL && quotes_match(current->data,
quote_len, IFREG(current->prev->data, &qreg))) {
size_t temp_id_len =
indent_length(current->prev->data + quote_len);
/* The indentation length of the previous line. */
/* Is this line the beginning of a paragraph, according to
* items 2), 5), or 4) above? If so, stop. */
if (current->prev->data[quote_len + temp_id_len] == '\0' ||
(quote_len == 0 && indent_len > 0
#ifndef NANO_SMALL
&& !ISSET(AUTOINDENT)
#endif
) ||
!indents_match(current->prev->data + quote_len,
temp_id_len, current->data + quote_len, indent_len))
break;
indent_len = temp_id_len;
current = current->prev;
current_y--;
}
} else if (search_type == 1) {
/* This line is not part of a paragraph. Move up until we get
* to a non "blank" line, and then move down once. */
do {
/* There is no previous paragraph, so nothing to move to. */
if (current->prev == NULL) {
placewewant = 0;
if (do_refresh) {
if (current_y < 0)
edit_update(current, CENTER);
else
edit_refresh();
}
#ifdef HAVE_REGEX_H
if (!do_restart)
regfree(&qreg);
#endif
return 1;
}
current = current->prev;
current_y--;
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. */
do {
/* There is no next paragraph, so nothing to move to. */
if (current->next == NULL) {
placewewant = 0;
if (do_refresh)
edit_refresh();
#ifdef HAVE_REGEX_H
regfree(&qreg);
#endif
return 1;
}
current = current->next;
current_y++;
quote_len = quote_length(IFREG(current->data, &qreg));
indent_len = indent_length(current->data + quote_len);
} 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. */
/* Next step, compute par_len, the number of lines in this paragraph. */
line = current;
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 (!indents_match(line->data + quote_len, indent_len,
line->next->data + quote_len, temp_id_len) ||
line->next->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->next;
par_len++;
}
if (search_type == 1) {
/* 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 (isspace(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
/* We no longer need to check quotation. */
regfree(&qreg);
#endif
/* 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 == 2) {
for (; par_len > 0; current_y++, par_len--)
current = current->next;
}
/* Refresh the screen if needed. */
if (do_refresh) {
if (((search_type == 0 || search_type == 2) && current_y >
editwinrows - 1) || (search_type == 1 && current_y < 0))
edit_update(current, CENTER);
else
edit_refresh();
}
/* Save the values of quote_len, par_len, and indent_len if
* needed. */
if (quote != NULL)
*quote = quote_len;
if (par != NULL)
*par = par_len;
if (indent != NULL)
*indent = indent_len;
return 0;
}
int do_para_begin(void)
{
return do_para_search(1, NULL, NULL, NULL, TRUE);
}
int do_para_end(void)
{
return do_para_search(2, NULL, NULL, NULL, TRUE);
}
#endif
/* Justify a paragraph. */
int do_justify(void)
{
#ifdef DISABLE_JUSTIFY
nano_disabled_msg();
return 1;
#else
size_t quote_len;
/* Length of the initial quotation of the paragraph we
* justify. */
@ -2261,151 +2496,17 @@ int do_para_operation(int operation)
#endif
size_t indent_len; /* Generic indentation length. */
filestruct *line; /* Generic line of text. */
size_t i; /* Generic loop variable. */
static int no_restart = 0;
/* Whether we're blocking 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 longer care about quotestr. */
int rc = regcomp(&qreg, quotestr, REG_EXTENDED);
if (rc) {
size_t size = regerror(rc, &qreg, NULL, 0);
char *strerror = charalloc(size);
regerror(rc, &qreg, strerror, size);
statusbar(_("Bad quote string %s: %s"), quotestr, strerror);
free(strerror);
return -1;
}
#endif
/* Here is an assumption that is always true anyway. */
assert(current != NULL);
current_x = 0;
restart_bps:
/* Here we find the first line of the paragraph to justify. If the
* current line is in a paragraph, then we move back to the first line.
* Otherwise we move down 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);
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)
* and 3) above. */
while (current->prev != NULL && quotes_match(current->data,
quote_len, IFREG(current->prev->data, &qreg))) {
size_t temp_id_len =
indent_length(current->prev->data + quote_len);
/* The indentation length of the previous line. */
/* Is this line the beginning of a paragraph, according to
items 2), 5), or 4) above? If so, stop. */
if (current->prev->data[quote_len + temp_id_len] == '\0' ||
(quote_len == 0 && indent_len > 0
#ifndef NANO_SMALL
&& !ISSET(AUTOINDENT)
#endif
) ||
!indents_match(current->prev->data + quote_len,
temp_id_len, current->data + quote_len, indent_len))
break;
indent_len = temp_id_len;
current = current->prev;
current_y--;
}
} else if (operation == 1) {
/* This line is not part of a paragraph. Move up until we get
* to a non "blank" line, and then move down once. */
do {
/* There is no previous paragraph, so nothing to move to. */
if (current->prev == NULL) {
placewewant = 0;
if (current_y < 0)
edit_update(current, CENTER);
else
edit_refresh();
return 0;
}
current = current->prev;
current_y--;
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. */
do {
/* There is no next paragraph, so nothing to justify. */
if (current->next == NULL) {
placewewant = 0;
edit_refresh();
#ifdef HAVE_REGEX_H
regfree(&qreg);
#endif
return 0;
}
current = current->next;
current_y++;
quote_len = quote_length(IFREG(current->data, &qreg));
indent_len = indent_length(current->data + quote_len);
} 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. */
/* Next step, compute par_len, the number of lines in this paragraph. */
line = current;
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 (!indents_match(line->data + quote_len, indent_len,
line->next->data + quote_len, temp_id_len) ||
line->next->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->next;
par_len++;
}
#ifdef HAVE_REGEX_H
/* We no longer need to check quotation, unless we're searching for
* the beginning of the paragraph. */
if (operation != 1)
regfree(&qreg);
#endif
/* Now par_len is the number of lines in this paragraph. Should never
* call quotes_match() or quote_length() again. */
/* If we're searching for the beginning of the paragraph, skip the
* justification. If we're searching for the end of the paragraph,
* move down the number of lines in the paragraph and skip the
* justification. */
if (operation == 1)
goto skip_justify;
else if (operation == 2) {
while (par_len > 0) {
current = current->next;
current_y++;
par_len--;
}
goto skip_justify;
/* First, search for the beginning of the current paragraph or, if
* we're at the end of it, the beginning of the next paragraph.
* Save the quote length, paragraph length, and indentation length
* and don't refresh the screen yet (since we'll do that after we
* justify). If the search failed, refresh the screen and get
* out. */
if (do_para_search(0, &quote_len, &par_len, &indent_len, FALSE) != 0) {
edit_refresh();
return 0;
}
/* Next step, we loop through the lines of this paragraph, justifying
@ -2539,7 +2640,7 @@ int do_para_operation(int operation)
#endif
next_line_len = strlen(current->next->data);
if (indent_len + break_pos == next_line_len) {
line = current->next;
filestruct *line = current->next;
/* Don't destroy edittop! */
if (line == edittop)
@ -2578,59 +2679,6 @@ int do_para_operation(int operation)
renumber(first_mod_line);
}
skip_justify:
if (operation == 1) {
/* We're on the same line we started on. Search for the first
* non-"blank" line before the line we're on (if there is one),
* continually restart that search from the current position
* until we find a line that's part of a paragraph, and then
* search once more from there, so that we end up on the first
* line of that paragraph. In the process, skip over lines
* consisting only of spacing characters, as searching for the
* end of the paragraph does. Then update the screen. */
if (current != fileage && current == current_save && !no_restart) {
while (current->prev != NULL) {
int j, j_space = 0;
current = current->prev;
current_y--;
for (j = 0; j < strlen(current->data); j++) {
if (isspace(current->data[j]))
j_space++;
else {
j = -1;
break;
}
}
if (j != j_space && strlen(current->data) >=
(quote_len + indent_len) &&
current->data[quote_len + indent_len] != '\0') {
no_restart = 1;
break;
}
}
goto restart_bps;
} else
no_restart = 0;
#ifdef HAVE_REGEX_H
/* We no longer need to check quotation, if we were
* searching for the beginning of the paragraph. */
regfree(&qreg);
#endif
if (current_y < 0)
edit_update(current, CENTER);
else
edit_refresh();
return 0;
} else if (operation == 2) {
/* We've already moved to the end of the paragraph. Update the
* screen. */
if (current_y > editwinrows - 1)
edit_update(current, CENTER);
else
edit_refresh();
return 0;
}
if (current_y > editwinrows - 1)
edit_update(current, CENTER);
else
@ -2714,31 +2762,9 @@ int do_para_operation(int operation)
display_main_list();
return 0;
}
#endif /* !DISABLE_JUSTIFY */
int do_justify(void)
{
#ifdef DISABLE_JUSTIFY
nano_disabled_msg();
return 1;
#else
return do_para_operation(0);
#endif
}
#ifndef DISABLE_JUSTIFY
int do_para_begin(void)
{
return do_para_operation(1);
}
int do_para_end(void)
{
return do_para_operation(2);
}
#endif
int do_exit(void)
{
int i;

9
src/proto.h
View File

@ -316,13 +316,12 @@ filestruct *backup_lines(filestruct *first_line, size_t par_len,
size_t quote_len);
int breakable(const char *line, int goal);
int break_line(const char *line, int goal, int force);
int do_para_operation(int operation);
#endif /* !DISABLE_JUSTIFY */
int do_justify(void);
#ifndef DISABLE_JUSTIFY
int do_para_search(int search_type, size_t *quote, size_t *par, size_t
*indent, int do_refresh);
int do_para_begin(void);
int do_para_end(void);
#endif
#endif /* !DISABLE_JUSTIFY */
int do_justify(void);
int do_exit(void);
void signal_init(void);
RETSIGTYPE handle_hupterm(int signal);