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rcfile: fully parse a syntax file only when needed

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When parsing an included syntax file, stop reading when a command other
than 'syntax', 'header' or 'magic' is encountered.  The syntax file is
fully parsed the first time that a file needs it.  Each 'extendsyntax'
command is stored for unloaded syntaxes and applied after the syntax
is loaded.

Closing a buffer does not unload the syntax, even if no longer used by
another buffer.

This addresses https://savannah.gnu.org/bugs/?54928.

Signed-off-by: Brand Huntsman <alpha@qzx.com>
This commit is contained in:
Brand Huntsman 2019-05-13 18:01:59 -06:00 committed by Benno Schulenberg
parent 0e29c2a24a
commit cba9d8d05e
4 changed files with 161 additions and 51 deletions
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58
src/color.c
View File

@ -39,11 +39,34 @@
#define A_BANDAID A_NORMAL
#endif
/* Assign pair numbers for the colors in the given syntax, giving identical
* color pairs the same number. */
void set_syntax_colorpairs(syntaxtype *sint)
{
int new_number = NUMBER_OF_ELEMENTS + 1;
colortype *ink;
for (ink = sint->color; ink != NULL; ink = ink->next) {
const colortype *beforenow = sint->color;
while (beforenow != ink && (beforenow->fg != ink->fg ||
beforenow->bg != ink->bg))
beforenow = beforenow->next;
if (beforenow != ink)
ink->pairnum = beforenow->pairnum;
else
ink->pairnum = new_number++;
ink->attributes |= COLOR_PAIR(ink->pairnum) | A_BANDAID;
}
}
/* Initialize the colors for nano's interface, and assign pair numbers
* for the colors in each syntax. */
* for the colors in each loaded syntax. */
void set_colorpairs(void)
{
const syntaxtype *sint;
syntaxtype *sint;
bool using_defaults = FALSE;
size_t i;
@ -82,27 +105,10 @@ void set_colorpairs(void)
free(color_combo[i]);
}
/* For each syntax, go through its list of colors and assign each
* its pair number, giving identical color pairs the same number. */
for (sint = syntaxes; sint != NULL; sint = sint->next) {
colortype *ink;
int new_number = NUMBER_OF_ELEMENTS + 1;
for (ink = sint->color; ink != NULL; ink = ink->next) {
const colortype *beforenow = sint->color;
while (beforenow != ink && (beforenow->fg != ink->fg ||
beforenow->bg != ink->bg))
beforenow = beforenow->next;
if (beforenow != ink)
ink->pairnum = beforenow->pairnum;
else
ink->pairnum = new_number++;
ink->attributes |= COLOR_PAIR(ink->pairnum) | A_BANDAID;
}
}
/* For each loaded syntax, assign pair numbers to color combinations. */
for (sint = syntaxes; sint != NULL; sint = sint->next)
if (sint->filename == NULL)
set_syntax_colorpairs(sint);
}
/* Initialize the color information. */
@ -267,6 +273,12 @@ void color_update(void)
}
}
/* When the syntax isn't loaded yet, parse it and initialize its colors. */
if (sint->filename != NULL) {
parse_one_include(sint->filename, sint);
set_syntax_colorpairs(sint);
}
openfile->syntax = sint;
openfile->colorstrings = (sint == NULL ? NULL : sint->color);

15
src/nano.h
View File

@ -215,9 +215,24 @@ typedef struct regexlisttype {
/* The next regex. */
} regexlisttype;
typedef struct extendsyntaxstruct {
char *filename;
/* The file where the syntax is extended. */
ssize_t lineno;
/* The number of the line of the extendsyntax command. */
char *data;
/* The text of the line. */
struct extendsyntaxstruct *next;
/* Next node. */
} extendsyntaxstruct;
typedef struct syntaxtype {
char *name;
/* The name of this syntax. */
char *filename;
/* File where the syntax is defined, or NULL if not an included file. */
struct extendsyntaxstruct *extendsyntax;
/* List of extendsyntax commands to apply when loaded. */
regexlisttype *extensions;
/* The list of extensions that this syntax applies to. */
regexlisttype *headers;

4
src/proto.h
View File

@ -465,10 +465,12 @@ int do_yesno_prompt(bool all, const char *msg);
/* Most functions in rcfile.c. */
#ifdef ENABLE_NANORC
void display_rcfile_errors();
bool parse_syntax_commands(char *keyword, char *ptr);
void parse_one_include(char *file, syntaxtype *syntax);
#ifdef ENABLE_COLOR
void grab_and_store(const char *kind, char *ptr, regexlisttype **storage);
#endif
void parse_rcfile(FILE *rcstream, bool syntax_only);
void parse_rcfile(FILE *rcstream, bool syntax_only, bool headers_only);
void do_rcfiles(void);
#endif /* ENABLE_NANORC */

135
src/rcfile.c
View File

@ -288,7 +288,7 @@ bool nregcomp(const char *regex, int compile_flags)
/* Parse the next syntax name and its possible extension regexes from the
* line at ptr, and add it to the global linked list of color syntaxes. */
void parse_syntax(char *ptr)
void parse_syntax(char *ptr, bool headers_only)
{
char *nameptr = ptr;
@ -324,6 +324,8 @@ void parse_syntax(char *ptr)
/* Initialize a new syntax struct. */
live_syntax = (syntaxtype *)nmalloc(sizeof(syntaxtype));
live_syntax->name = mallocstrcpy(NULL, nameptr);
live_syntax->filename = (headers_only ? strdup(nanorc) : NULL);
live_syntax->extendsyntax = NULL;
live_syntax->extensions = NULL;
live_syntax->headers = NULL;
live_syntax->magics = NULL;
@ -539,7 +541,7 @@ bool is_good_file(char *file)
#ifdef ENABLE_COLOR
/* Read and parse one included syntax file. */
static void parse_one_include(char *file)
void parse_one_include(char *file, syntaxtype *syntax)
{
FILE *rcstream;
@ -560,7 +562,49 @@ static void parse_one_include(char *file)
nanorc = file;
lineno = 0;
parse_rcfile(rcstream, TRUE);
/* If this is the first pass, parse only the prologue. */
if (syntax == NULL) {
parse_rcfile(rcstream, TRUE, TRUE);
return;
}
live_syntax = syntax;
opensyntax = TRUE;
lastcolor = NULL;
/* Parse the included file fully. */
parse_rcfile(rcstream, TRUE, FALSE);
opensyntax = TRUE;
lastcolor = syntax->color;
if (lastcolor != NULL)
while (lastcolor->next != NULL)
lastcolor = lastcolor->next;
extendsyntaxstruct *es = syntax->extendsyntax;
/* Apply any stored extendsyntax commands. */
while (es != NULL) {
extendsyntaxstruct *next = es->next;
char *keyword = es->data, *ptr = parse_next_word(es->data);
nanorc = es->filename;
lineno = es->lineno;
if (!parse_syntax_commands(keyword, ptr))
rcfile_error(N_("Command \"%s\" not understood"), keyword);
free(es->filename);
free(es->data);
free(es);
es = next;
}
free(syntax->filename);
syntax->filename = NULL;
syntax->extendsyntax = NULL;
opensyntax = FALSE;
}
/* Expand globs in the passed name, and parse the resultant files. */
@ -585,7 +629,7 @@ void parse_includes(char *ptr)
* report an error if it's something other than zero matches. */
if (result == 0) {
for (size_t i = 0; i < files.gl_pathc; ++i)
parse_one_include(files.gl_pathv[i]);
parse_one_include(files.gl_pathv[i], NULL);
} else if (result != GLOB_NOMATCH)
rcfile_error(_("Error expanding %s: %s"), pattern, strerror(errno));
@ -931,10 +975,31 @@ static void check_vitals_mapped(void)
}
}
/* Parse syntax-only commands. */
bool parse_syntax_commands(char *keyword, char *ptr)
{
if (strcasecmp(keyword, "comment") == 0)
#ifdef ENABLE_COMMENT
pick_up_name("comment", ptr, &live_syntax->comment);
#else
;
#endif
else if (strcasecmp(keyword, "color") == 0)
parse_colors(ptr, NANO_REG_EXTENDED);
else if (strcasecmp(keyword, "icolor") == 0)
parse_colors(ptr, NANO_REG_EXTENDED | REG_ICASE);
else if (strcasecmp(keyword, "linter") == 0)
pick_up_name("linter", ptr, &live_syntax->linter);
else
return FALSE;
return TRUE;
}
/* Parse the rcfile, once it has been opened successfully at rcstream,
* and close it afterwards. If syntax_only is TRUE, allow the file to
* to contain only color syntax commands. */
void parse_rcfile(FILE *rcstream, bool syntax_only)
void parse_rcfile(FILE *rcstream, bool syntax_only, bool headers_only)
{
char *buf = NULL;
ssize_t len;
@ -981,6 +1046,26 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
continue;
}
/* When the syntax isn't loaded yet, store extendsyntax commands. */
if (sint->filename != NULL) {
extendsyntaxstruct *newextendsyntax = nmalloc(sizeof(extendsyntaxstruct));;
newextendsyntax->filename = strdup(nanorc);
newextendsyntax->lineno = lineno;
newextendsyntax->data = strdup(ptr);
newextendsyntax->next = NULL;
if (sint->extendsyntax != NULL) {
extendsyntaxstruct *es = sint->extendsyntax;
while (es->next != NULL)
es = es->next;
es->next = newextendsyntax;
} else
sint->extendsyntax = newextendsyntax;
continue;
}
live_syntax = sint;
opensyntax = TRUE;
@ -996,31 +1081,27 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
/* Try to parse the keyword. */
if (strcasecmp(keyword, "syntax") == 0) {
if (opensyntax && lastcolor == NULL)
rcfile_error(N_("Syntax \"%s\" has no color commands"),
live_syntax->name);
parse_syntax(ptr);
if (headers_only || !syntax_only) {
if (opensyntax && lastcolor == NULL && live_syntax->filename == NULL)
rcfile_error(N_("Syntax \"%s\" has no color commands"),
live_syntax->name);
parse_syntax(ptr, headers_only);
}
}
else if (strcasecmp(keyword, "header") == 0)
grab_and_store("header", ptr, &live_syntax->headers);
else if (strcasecmp(keyword, "magic") == 0)
else if (strcasecmp(keyword, "header") == 0) {
if (headers_only || !syntax_only)
grab_and_store("header", ptr, &live_syntax->headers);
} else if (strcasecmp(keyword, "magic") == 0)
#ifdef HAVE_LIBMAGIC
grab_and_store("magic", ptr, &live_syntax->magics);
if (headers_only || !syntax_only)
grab_and_store("magic", ptr, &live_syntax->magics);
#else
;
#endif
else if (strcasecmp(keyword, "comment") == 0)
#ifdef ENABLE_COMMENT
pick_up_name("comment", ptr, &live_syntax->comment);
#else
else if (headers_only)
break;
else if (parse_syntax_commands(keyword, ptr))
;
#endif
else if (strcasecmp(keyword, "color") == 0)
parse_colors(ptr, NANO_REG_EXTENDED);
else if (strcasecmp(keyword, "icolor") == 0)
parse_colors(ptr, NANO_REG_EXTENDED | REG_ICASE);
else if (strcasecmp(keyword, "linter") == 0)
pick_up_name("linter", ptr, &live_syntax->linter);
else if (syntax_only && (strcasecmp(keyword, "set") == 0 ||
strcasecmp(keyword, "unset") == 0 ||
strcasecmp(keyword, "bind") == 0 ||
@ -1046,7 +1127,7 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
#ifdef ENABLE_COLOR
/* If a syntax was extended, it stops at the end of the command. */
if (live_syntax != syntaxes)
if (!syntax_only && live_syntax != syntaxes)
opensyntax = FALSE;
#endif
@ -1210,7 +1291,7 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
}
#ifdef ENABLE_COLOR
if (opensyntax && lastcolor == NULL)
if (opensyntax && lastcolor == NULL && !headers_only)
rcfile_error(N_("Syntax \"%s\" has no color commands"),
live_syntax->name);
@ -1238,7 +1319,7 @@ void parse_one_nanorc(void)
/* If opening the file succeeded, parse it. Otherwise, only
* complain if the file actually exists. */
if (rcstream != NULL)
parse_rcfile(rcstream, FALSE);
parse_rcfile(rcstream, FALSE, FALSE);
else if (errno != ENOENT)
rcfile_error(N_("Error reading %s: %s"), nanorc, strerror(errno));
}