harfbuzz/util/options.cc

316 lines
8.2 KiB
C++

/*
* Copyright © 2011 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#include "options.hh"
view_options_t view_opts[1];
shape_options_t shape_opts[1];
font_options_t font_opts[1];
const char *out_file = "/dev/stdout";
hb_bool_t debug = FALSE;
static gboolean
parse_margin (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
view_options_t::margin_t &m = view_opts->margin;
switch (sscanf (arg, "%lf %lf %lf %lf", &m.t, &m.r, &m.b, &m.l)) {
case 1: m.r = m.t;
case 2: m.b = m.t;
case 3: m.l = m.r;
case 4: return TRUE;
default:
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"%s argument should be one to four space-separated numbers",
name);
return FALSE;
}
}
static gboolean
parse_shapers (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
shape_opts->shapers = g_strsplit (arg, ",", 0);
return TRUE;
}
static void
parse_space (char **pp)
{
char c;
#define ISSPACE(c) ((c)==' '||(c)=='\f'||(c)=='\n'||(c)=='\r'||(c)=='\t'||(c)=='\v')
while (c = **pp, ISSPACE (c))
(*pp)++;
#undef ISSPACE
}
static hb_bool_t
parse_char (char **pp, char c)
{
parse_space (pp);
if (**pp != c)
return FALSE;
(*pp)++;
return TRUE;
}
static hb_bool_t
parse_uint (char **pp, unsigned int *pv)
{
char *p = *pp;
unsigned int v;
v = strtol (p, pp, 0);
if (p == *pp)
return FALSE;
*pv = v;
return TRUE;
}
static hb_bool_t
parse_feature_value_prefix (char **pp, hb_feature_t *feature)
{
if (parse_char (pp, '-'))
feature->value = 0;
else {
parse_char (pp, '+');
feature->value = 1;
}
return TRUE;
}
static hb_bool_t
parse_feature_tag (char **pp, hb_feature_t *feature)
{
char *p = *pp, c;
parse_space (pp);
#define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
while (c = **pp, ISALNUM(c))
(*pp)++;
#undef ISALNUM
if (p == *pp)
return FALSE;
feature->tag = hb_tag_from_string (p, *pp - p);
return TRUE;
}
static hb_bool_t
parse_feature_indices (char **pp, hb_feature_t *feature)
{
hb_bool_t has_start;
feature->start = 0;
feature->end = (unsigned int) -1;
if (!parse_char (pp, '['))
return TRUE;
has_start = parse_uint (pp, &feature->start);
if (parse_char (pp, ':')) {
parse_uint (pp, &feature->end);
} else {
if (has_start)
feature->end = feature->start + 1;
}
return parse_char (pp, ']');
}
static hb_bool_t
parse_feature_value_postfix (char **pp, hb_feature_t *feature)
{
return !parse_char (pp, '=') || parse_uint (pp, &feature->value);
}
static hb_bool_t
parse_one_feature (char **pp, hb_feature_t *feature)
{
return parse_feature_value_prefix (pp, feature) &&
parse_feature_tag (pp, feature) &&
parse_feature_indices (pp, feature) &&
parse_feature_value_postfix (pp, feature) &&
(parse_char (pp, ',') || **pp == '\0');
}
static void
skip_one_feature (char **pp)
{
char *e;
e = strchr (*pp, ',');
if (e)
*pp = e + 1;
else
*pp = *pp + strlen (*pp);
}
static gboolean
parse_features (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
char *s = (char *) arg;
char *p;
shape_opts->num_features = 0;
shape_opts->features = NULL;
if (!*s)
return TRUE;
/* count the features first, so we can allocate memory */
p = s;
do {
shape_opts->num_features++;
p = strchr (p, ',');
if (p)
p++;
} while (p);
shape_opts->features = (hb_feature_t *) calloc (shape_opts->num_features, sizeof (*shape_opts->features));
/* now do the actual parsing */
p = s;
shape_opts->num_features = 0;
while (*p) {
if (parse_one_feature (&p, &shape_opts->features[shape_opts->num_features]))
shape_opts->num_features++;
else
skip_one_feature (&p);
}
return TRUE;
}
static gchar *
shapers_to_string (void)
{
GString *shapers = g_string_new (NULL);
const char **shaper_list = hb_shape_list_shapers ();
for (; *shaper_list; shaper_list++) {
g_string_append (shapers, *shaper_list);
g_string_append_c (shapers, ',');
}
g_string_truncate (shapers, MAX (0, (gint)shapers->len - 1));
return g_string_free (shapers, FALSE);
}
static G_GNUC_NORETURN gboolean
show_version (const char *name G_GNUC_UNUSED,
const char *arg G_GNUC_UNUSED,
gpointer data G_GNUC_UNUSED,
GError **error G_GNUC_UNUSED)
{
g_printf ("%s (%s) %s\n", g_get_prgname (), PACKAGE_NAME, PACKAGE_VERSION);
char *shapers = shapers_to_string ();
g_printf ("Available shapers: %s\n", shapers);
g_free (shapers);
if (strcmp (HB_VERSION_STRING, hb_version_string ()))
g_printf ("Linked HarfBuzz library has a different version: %s\n", hb_version_string ());
exit(0);
}
void
parse_options (int argc, char *argv[])
{
GOptionEntry entries[] =
{
{"version", 0, G_OPTION_FLAG_NO_ARG,
G_OPTION_ARG_CALLBACK, (gpointer) &show_version, "Show version numbers", NULL},
{"debug", 0, 0, G_OPTION_ARG_NONE, &debug, "Free all resources before exit", NULL},
{"output", 0, 0, G_OPTION_ARG_STRING, &out_file, "Set output file name", "filename"},
{"annotate", 0, 0, G_OPTION_ARG_NONE, &view_opts->annotate, "Annotate output rendering", NULL},
{"background", 0, 0, G_OPTION_ARG_STRING, &view_opts->back, "Set background color", "red/#rrggbb/#rrggbbaa"},
{"foreground", 0, 0, G_OPTION_ARG_STRING, &view_opts->fore, "Set foreground color", "red/#rrggbb/#rrggbbaa"},
{"line-space", 0, 0, G_OPTION_ARG_DOUBLE, &view_opts->line_space, "Set space between lines (default: 0)", "units"},
{"margin", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_margin, "Margin around output", "one to four numbers"},
{"shapers", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_shapers, "Comma-separated list of shapers", "list"},
{"direction", 0, 0, G_OPTION_ARG_STRING, &shape_opts->direction, "Set text direction (default: auto)", "ltr/rtl/ttb/btt"},
{"language", 0, 0, G_OPTION_ARG_STRING, &shape_opts->language, "Set text language (default: $LANG)", "langstr"},
{"script", 0, 0, G_OPTION_ARG_STRING, &shape_opts->script, "Set text script (default: auto)", "ISO-15924 tag"},
{"features", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) &parse_features, "Font features to apply to text", "TODO"},
{"face-index", 0, 0, G_OPTION_ARG_INT, &font_opts->face_index, "Face index (default: 0)", "index"},
{"font-size", 0, 0, G_OPTION_ARG_DOUBLE, &font_opts->font_size, "Font size", "size"},
{NULL}
};
GError *parse_error = NULL;
GOptionContext *context;
context = g_option_context_new ("- FONT-FILE TEXT");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &parse_error))
{
if (parse_error != NULL)
fail ("%s", parse_error->message);
else
fail ("Option parse error");
exit(1);
}
g_option_context_free(context);
if (argc != 3) {
g_printerr ("Usage: %s [OPTION...] FONT-FILE TEXT\n", g_get_prgname ());
exit (1);
}
font_opts->font_file = argv[1];
shape_opts->text = argv[2];
}