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Move code around

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pull/407/head
Behdad Esfahbod 8 years ago
parent 785982bf83
commit 72364103bc
4 changed files with 268 additions and 264 deletions
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  1. 250
      src/hb-common.cc
  2. 18
      src/hb-common.h
  3. 248
      src/hb-shape.cc
  4. 16
      src/hb-shape.h

250
src/hb-common.cc
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@ -605,3 +605,253 @@ hb_version_atleast (unsigned int major,
{
return HB_VERSION_ATLEAST (major, minor, micro);
}
/* hb_feature_t */
static bool
parse_space (const char **pp, const char *end)
{
while (*pp < end && ISSPACE (**pp))
(*pp)++;
return true;
}
static bool
parse_char (const char **pp, const char *end, char c)
{
parse_space (pp, end);
if (*pp == end || **pp != c)
return false;
(*pp)++;
return true;
}
static bool
parse_uint (const char **pp, const char *end, unsigned int *pv)
{
char buf[32];
unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - *pp));
strncpy (buf, *pp, len);
buf[len] = '\0';
char *p = buf;
char *pend = p;
unsigned int v;
/* Intentionally use strtol instead of strtoul, such that
* -1 turns into "big number"... */
errno = 0;
v = strtol (p, &pend, 0);
if (errno || p == pend)
return false;
*pv = v;
*pp += pend - p;
return true;
}
static bool
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 bool
parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature)
{
if (parse_char (pp, end, '-'))
feature->value = 0;
else {
parse_char (pp, end, '+');
feature->value = 1;
}
return true;
}
static bool
parse_feature_tag (const char **pp, const char *end, hb_feature_t *feature)
{
parse_space (pp, end);
char quote = 0;
if (*pp < end && (**pp == '\'' || **pp == '"'))
{
quote = **pp;
(*pp)++;
}
const char *p = *pp;
while (*pp < end && ISALNUM(**pp))
(*pp)++;
if (p == *pp || *pp - p > 4)
return false;
feature->tag = hb_tag_from_string (p, *pp - p);
if (quote)
{
/* CSS expects exactly four bytes. And we only allow quotations for
* CSS compatibility. So, enforce the length. */
if (*pp - p != 4)
return false;
if (*pp == end || **pp != quote)
return false;
(*pp)++;
}
return true;
}
static bool
parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature)
{
parse_space (pp, end);
bool has_start;
feature->start = 0;
feature->end = (unsigned int) -1;
if (!parse_char (pp, end, '['))
return true;
has_start = parse_uint (pp, end, &feature->start);
if (parse_char (pp, end, ':')) {
parse_uint (pp, end, &feature->end);
} else {
if (has_start)
feature->end = feature->start + 1;
}
return parse_char (pp, end, ']');
}
static bool
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) ||
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;
}
static bool
parse_one_feature (const char **pp, const char *end, hb_feature_t *feature)
{
return parse_feature_value_prefix (pp, end, feature) &&
parse_feature_tag (pp, end, feature) &&
parse_feature_indices (pp, end, feature) &&
parse_feature_value_postfix (pp, end, feature) &&
parse_space (pp, end) &&
*pp == end;
}
/**
* hb_feature_from_string:
* @str: (array length=len) (element-type uint8_t): a string to parse
* @len: length of @str, or -1 if string is %NULL terminated
* @feature: (out): the #hb_feature_t to initialize with the parsed values
*
* Parses a string into a #hb_feature_t.
*
* TODO: document the syntax here.
*
* Return value:
* %true if @str is successfully parsed, %false otherwise.
*
* Since: 0.9.5
**/
hb_bool_t
hb_feature_from_string (const char *str, int len,
hb_feature_t *feature)
{
hb_feature_t feat;
if (len < 0)
len = strlen (str);
if (likely (parse_one_feature (&str, str + len, &feat)))
{
if (feature)
*feature = feat;
return true;
}
if (feature)
memset (feature, 0, sizeof (*feature));
return false;
}
/**
* hb_feature_to_string:
* @feature: an #hb_feature_t to convert
* @buf: (array length=size) (out): output string
* @size: the allocated size of @buf
*
* Converts a #hb_feature_t into a %NULL-terminated string in the format
* understood by hb_feature_from_string(). The client in responsible for
* allocating big enough size for @buf, 128 bytes is more than enough.
*
* Since: 0.9.5
**/
void
hb_feature_to_string (hb_feature_t *feature,
char *buf, unsigned int size)
{
if (unlikely (!size)) return;
char s[128];
unsigned int len = 0;
if (feature->value == 0)
s[len++] = '-';
hb_tag_to_string (feature->tag, s + len);
len += 4;
while (len && s[len - 1] == ' ')
len--;
if (feature->start != 0 || feature->end != (unsigned int) -1)
{
s[len++] = '[';
if (feature->start)
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->start));
if (feature->end != feature->start + 1) {
s[len++] = ':';
if (feature->end != (unsigned int) -1)
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->end));
}
s[len++] = ']';
}
if (feature->value > 1)
{
s[len++] = '=';
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->value));
}
assert (len < ARRAY_LENGTH (s));
len = MIN (len, size - 1);
memcpy (buf, s, len);
buf[len] = '\0';
}

18
src/hb-common.h
Unescape View File

@ -362,6 +362,24 @@ typedef struct hb_user_data_key_t {
typedef void (*hb_destroy_func_t) (void *user_data);
/* Font features. */
typedef struct hb_feature_t {
hb_tag_t tag;
uint32_t value;
unsigned int start;
unsigned int end;
} hb_feature_t;
HB_EXTERN hb_bool_t
hb_feature_from_string (const char *str, int len,
hb_feature_t *feature);
HB_EXTERN void
hb_feature_to_string (hb_feature_t *feature,
char *buf, unsigned int size);
HB_END_DECLS
#endif /* HB_COMMON_H */

248
src/hb-shape.cc
Unescape View File

@ -45,254 +45,6 @@
* contains the output glyphs and their positions.
**/
static bool
parse_space (const char **pp, const char *end)
{
while (*pp < end && ISSPACE (**pp))
(*pp)++;
return true;
}
static bool
parse_char (const char **pp, const char *end, char c)
{
parse_space (pp, end);
if (*pp == end || **pp != c)
return false;
(*pp)++;
return true;
}
static bool
parse_uint (const char **pp, const char *end, unsigned int *pv)
{
char buf[32];
unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - *pp));
strncpy (buf, *pp, len);
buf[len] = '\0';
char *p = buf;
char *pend = p;
unsigned int v;
/* Intentionally use strtol instead of strtoul, such that
* -1 turns into "big number"... */
errno = 0;
v = strtol (p, &pend, 0);
if (errno || p == pend)
return false;
*pv = v;
*pp += pend - p;
return true;
}
static bool
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 bool
parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature)
{
if (parse_char (pp, end, '-'))
feature->value = 0;
else {
parse_char (pp, end, '+');
feature->value = 1;
}
return true;
}
static bool
parse_feature_tag (const char **pp, const char *end, hb_feature_t *feature)
{
parse_space (pp, end);
char quote = 0;
if (*pp < end && (**pp == '\'' || **pp == '"'))
{
quote = **pp;
(*pp)++;
}
const char *p = *pp;
while (*pp < end && ISALNUM(**pp))
(*pp)++;
if (p == *pp || *pp - p > 4)
return false;
feature->tag = hb_tag_from_string (p, *pp - p);
if (quote)
{
/* CSS expects exactly four bytes. And we only allow quotations for
* CSS compatibility. So, enforce the length. */
if (*pp - p != 4)
return false;
if (*pp == end || **pp != quote)
return false;
(*pp)++;
}
return true;
}
static bool
parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature)
{
parse_space (pp, end);
bool has_start;
feature->start = 0;
feature->end = (unsigned int) -1;
if (!parse_char (pp, end, '['))
return true;
has_start = parse_uint (pp, end, &feature->start);
if (parse_char (pp, end, ':')) {
parse_uint (pp, end, &feature->end);
} else {
if (has_start)
feature->end = feature->start + 1;
}
return parse_char (pp, end, ']');
}
static bool
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) ||
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;
}
static bool
parse_one_feature (const char **pp, const char *end, hb_feature_t *feature)
{
return parse_feature_value_prefix (pp, end, feature) &&
parse_feature_tag (pp, end, feature) &&
parse_feature_indices (pp, end, feature) &&
parse_feature_value_postfix (pp, end, feature) &&
parse_space (pp, end) &&
*pp == end;
}
/**
* hb_feature_from_string:
* @str: (array length=len) (element-type uint8_t): a string to parse
* @len: length of @str, or -1 if string is %NULL terminated
* @feature: (out): the #hb_feature_t to initialize with the parsed values
*
* Parses a string into a #hb_feature_t.
*
* TODO: document the syntax here.
*
* Return value:
* %true if @str is successfully parsed, %false otherwise.
*
* Since: 0.9.5
**/
hb_bool_t
hb_feature_from_string (const char *str, int len,
hb_feature_t *feature)
{
hb_feature_t feat;
if (len < 0)
len = strlen (str);
if (likely (parse_one_feature (&str, str + len, &feat)))
{
if (feature)
*feature = feat;
return true;
}
if (feature)
memset (feature, 0, sizeof (*feature));
return false;
}
/**
* hb_feature_to_string:
* @feature: an #hb_feature_t to convert
* @buf: (array length=size) (out): output string
* @size: the allocated size of @buf
*
* Converts a #hb_feature_t into a %NULL-terminated string in the format
* understood by hb_feature_from_string(). The client in responsible for
* allocating big enough size for @buf, 128 bytes is more than enough.
*
* Since: 0.9.5
**/
void
hb_feature_to_string (hb_feature_t *feature,
char *buf, unsigned int size)
{
if (unlikely (!size)) return;
char s[128];
unsigned int len = 0;
if (feature->value == 0)
s[len++] = '-';
hb_tag_to_string (feature->tag, s + len);
len += 4;
while (len && s[len - 1] == ' ')
len--;
if (feature->start != 0 || feature->end != (unsigned int) -1)
{
s[len++] = '[';
if (feature->start)
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->start));
if (feature->end != feature->start + 1) {
s[len++] = ':';
if (feature->end != (unsigned int) -1)
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->end));
}
s[len++] = ']';
}
if (feature->value > 1)
{
s[len++] = '=';
len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%u", feature->value));
}
assert (len < ARRAY_LENGTH (s));
len = MIN (len, size - 1);
memcpy (buf, s, len);
buf[len] = '\0';
}
static const char **static_shaper_list;
#ifdef HB_USE_ATEXIT

16
src/hb-shape.h
Unescape View File

@ -40,22 +40,6 @@
HB_BEGIN_DECLS
typedef struct hb_feature_t {
hb_tag_t tag;
uint32_t value;
unsigned int start;
unsigned int end;
} hb_feature_t;
HB_EXTERN hb_bool_t
hb_feature_from_string (const char *str, int len,
hb_feature_t *feature);
HB_EXTERN void
hb_feature_to_string (hb_feature_t *feature,
char *buf, unsigned int size);
HB_EXTERN void
hb_shape (hb_font_t *font,
hb_buffer_t *buffer,

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