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Allow on/off in hb_feature_from_string() 

We now allow things like "dlig on" / "dlig=on".
This commit is contained in:
Behdad Esfahbod 2014-07-25 12:01:22 -04:00
parent d9e618eca9
commit 60cb18a5de
1 changed files with 24 additions and 2 deletions
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26
src/hb-shape.cc
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@ -78,6 +78,26 @@ parse_uint (const char **pp, const char *end, unsigned int *pv)
return true;
}
static hb_bool_t
parse_bool (const char **pp, const char *end, unsigned int *pv)
{
parse_space (pp, end);
const char *p = *pp;
while (*pp < end && ISALPHA(**pp))
(*pp)++;
/* CSS allows on/off as aliases 1/0. */
if (*pp - p == 2 || 0 == strncmp (p, "on", 2))
*pv = 1;
else if (*pp - p == 3 || 0 == strncmp (p, "off", 2))
*pv = 0;
else
return false;
return true;
}
static hb_bool_t
parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature)
{
@ -138,8 +158,10 @@ static hb_bool_t
parse_feature_value_postfix (const char **pp, const char *end, hb_feature_t *feature)
{
bool had_equal = parse_char (pp, end, '=');
bool had_value = parse_uint (pp, end, &feature->value);
/* If there was an equal-sign, then there *must* be a value.
bool had_value = parse_uint (pp, end, &feature->value) ||
parse_bool (pp, end, &feature->value);
/* CSS doesn't use equal-sign between tag and value.
* If there was an equal-sign, then there *must* be a value.
* A value without an eqaul-sign is ok, but not required. */
return !had_equal || had_value;
}