#include <libcss/libcss.h>
+#include <strings.h> /* strncasecmp */
#include "svgtiny.h"
#include "svgtiny_internal.h"
const css_qname *qname, bool *match);
static css_error node_has_class(void *pw, void *node,
lwc_string *name, bool *match);
+static css_error node_has_id(void *pw, void *node,
+ lwc_string *name, bool *match);
+static css_error node_has_attribute(void *pw, void *node,
+ const css_qname *qname, bool *match);
+static css_error node_has_attribute_equal(void *pw, void *node,
+ const css_qname *qname, lwc_string *value,
+ bool *match);
+static css_error node_has_attribute_dashmatch(void *pw, void *node,
+ const css_qname *qname, lwc_string *value,
+ bool *match);
+static css_error node_has_attribute_includes(void *pw, void *node,
+ const css_qname *qname, lwc_string *word,
+ bool *match);
+static css_error node_has_attribute_prefix(void *pw, void *node,
+ const css_qname *qname, lwc_string *prefix,
+ bool *match);
+static css_error node_has_attribute_suffix(void *pw, void *node,
+ const css_qname *qname, lwc_string *suffix,
+ bool *match);
/**
dom_element_has_class((dom_node *)node, name, match);
return CSS_OK;
}
+
+
+/**
+ * Test the given node for the given id
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has the given id. The comparison is case-sensitive. It corresponds
+ * to node#id in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param name Id to check for
+ * \param match Pointer to the test result
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_has_id(void *pw, void *node,
+ lwc_string *name, bool *match)
+{
+ dom_string *attr;
+ dom_exception err;
+ struct svgtiny_parse_state *state;
+
+ attr = NULL; /* a priori the "id" attribute may not exist */
+ *match = false; /* default to no match */
+
+ state = (struct svgtiny_parse_state *)pw;
+ err = dom_element_get_attribute((dom_node *)node,
+ state->interned_id, &attr);
+ if (err != DOM_NO_ERR || attr == NULL) {
+ return CSS_OK;
+ }
+
+ *match = dom_string_lwc_isequal(attr, name);
+ dom_string_unref(attr);
+
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for the given attribute
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name. The comparison is
+ * case-sensitive. It corresponds to node[attr] in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if anything
+ * goes wrong
+ */
+css_error node_has_attribute(void *pw, void *node,
+ const css_qname *qname, bool *match)
+{
+ UNUSED(pw);
+ dom_string *name;
+ dom_exception err;
+
+ /* intern the attribute name as a dom_string so we can
+ * delegate to dom_element_has_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_has_attribute((dom_node *)node, name, match);
+ if (err != DOM_NO_ERR) {
+ dom_string_unref(name);
+ return CSS_OK;
+ }
+
+ dom_string_unref(name);
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for an attribute with a specific value
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name and value. The comparison is
+ * case-sensitive. It corresponds to node[attr=value] in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param value Attribute value to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if we cannot
+ * intern the attribute name (which usually indicates memory
+ * exhaustion)
+ */
+css_error node_has_attribute_equal(void *pw, void *node,
+ const css_qname *qname, lwc_string *value,
+ bool *match)
+{
+ /* Implementation note: NetSurf always returns "no match" when
+ * the value is empty (length zero). We allow it, because why
+ * not? */
+
+ UNUSED(pw);
+ dom_string *name;
+ dom_string *attr_val;
+ dom_exception err;
+
+ /* Intern the attribute name as a dom_string so we can
+ * use dom_element_get_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_get_attribute((dom_node *)node, name, &attr_val);
+ if ((err != DOM_NO_ERR) || (attr_val == NULL)) {
+ /* There was an error getting the attribute's value or
+ * the attribute doesn't exist. So, no match? */
+ dom_string_unref(name);
+ *match = false;
+ return CSS_OK;
+ }
+
+ /* Otherwise, we have the attribute value from the given node
+ * and all we need to do is compare. */
+ dom_string_unref(name);
+ *match = dom_string_lwc_isequal(attr_val, value);
+ dom_string_unref(attr_val);
+
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for an attribute with a specific value,
+ * possibly followed by a single hyphen
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name and value or with the given
+ * name and a value that is followed by exactly one hyphen. The
+ * comparison is case-sensitive. This corresponds to [attr|=value]
+ * in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param value Attribute value to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if we cannot
+ * intern the attribute name (which usually indicates memory
+ * exhaustion)
+ */
+css_error node_has_attribute_dashmatch(void *pw, void *node,
+ const css_qname *qname, lwc_string *value,
+ bool *match)
+{
+ /* Implementation note: NetSurf always returns "no match" when
+ * the value is empty (length zero). We allow it, because why
+ * not? */
+
+ UNUSED(pw);
+ dom_string *name;
+ dom_string *attr_val;
+ dom_exception err;
+
+ const char *vdata; /* to hold the data underlying "value" */
+ size_t vdata_len;
+ const char *avdata; /* to hold the found attribute value data */
+ size_t avdata_len;
+
+ /* Intern the attribute name as a dom_string so we can
+ * use dom_element_get_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_get_attribute((dom_node *)node, name, &attr_val);
+ if ((err != DOM_NO_ERR) || (attr_val == NULL)) {
+ /* There was an error getting the attribute's value or
+ * the attribute doesn't exist. So, no match? */
+ dom_string_unref(name);
+ *match = false;
+ return CSS_OK;
+ }
+
+ /* Otherwise, we have the attribute value from the given node
+ * and all we need to do is compare. */
+ dom_string_unref(name);
+ *match = dom_string_lwc_isequal(attr_val, value);
+ if (*match) {
+ /* Exact match, we're done */
+ dom_string_unref(attr_val);
+ return CSS_OK;
+ }
+
+ /* No exact match, try it with a hyphen on the end */
+ vdata = lwc_string_data(value); /* needle */
+ vdata_len = lwc_string_length(value);
+ avdata = dom_string_data(attr_val); /* haystack */
+ avdata_len = dom_string_byte_length(attr_val);
+ dom_string_unref(attr_val);
+
+ if (avdata_len > vdata_len && avdata[vdata_len] == '-') {
+ if (strncasecmp(avdata, vdata, vdata_len) == 0) {
+ /* If there's a hyphen in the right position,
+ * it suffices to compare the strings only up
+ * to the hyphen */
+ *match = true;
+ }
+ }
+
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for an attribute whose value is a
+ * space-separated list of words, one of which is the given word
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name and whose value when
+ * considered as a space-separated list of words contains the given
+ * word. The comparison is case-sensitive. This corresponds to
+ * [attr~=value] in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param word Value word to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if we cannot
+ * intern the attribute name (which usually indicates memory
+ * exhaustion)
+ */
+css_error node_has_attribute_includes(void *pw, void *node,
+ const css_qname *qname, lwc_string *word,
+ bool *match)
+{
+ UNUSED(pw);
+
+ dom_string *name;
+ dom_string *attr_val;
+ dom_exception err;
+ size_t wordlen; /* length of "word" */
+
+ /* pointers used to parse a space-separated list of words */
+ const char *p;
+ const char *start;
+ const char *end;
+
+ *match = false; /* default to no match */
+
+ wordlen = lwc_string_length(word);
+ if (wordlen == 0) {
+ /* In this case, the spec says that "if 'val' is the
+ * empty string, it will never represent anything." */
+ return CSS_OK;
+ }
+
+ /* Intern the attribute name as a dom_string so we can
+ * use dom_element_get_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_get_attribute((dom_node *)node, name, &attr_val);
+ if ((err != DOM_NO_ERR) || (attr_val == NULL)) {
+ /* There was an error getting the attribute's value or
+ * the attribute doesn't exist. So, no match? */
+ dom_string_unref(name);
+ return CSS_OK;
+ }
+
+ /* Parse the list comparing each word against "word" */
+ start = dom_string_data(attr_val);
+ end = start + dom_string_byte_length(attr_val);
+ dom_string_unref(attr_val);
+
+ for (p = start; p <= end; p++) {
+ /* Move forward until we find the end of the first word */
+ if (*p == ' ' || *p == '\0') {
+ /* If the length of that word is the length of the
+ * word we're looking for, do the comparison. */
+ if ((size_t) (p - start) == wordlen &&
+ strncasecmp(start,
+ lwc_string_data(word),
+ wordlen) == 0) {
+ *match = true;
+ break;
+ }
+ /* No match? Set "start" to the beginning of
+ * the next word and loop. */
+ start = p + 1;
+ }
+ }
+
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for an attribute whose value begins with the
+ * given prefix
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name and whose value begins with
+ * the given prefix string. The comparison is case-sensitive. This
+ * corresponds to [attr^=value] in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param prefix Value prefix to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if we cannot
+ * intern the attribute name (which usually indicates memory
+ * exhaustion)
+ */
+css_error node_has_attribute_prefix(void *pw, void *node,
+ const css_qname *qname, lwc_string *prefix,
+ bool *match)
+{
+ UNUSED(pw);
+ dom_string *name;
+ dom_string *attr_val;
+ dom_exception err;
+ const char *avdata; /* attribute value data */
+ size_t avdata_len; /* length of that attribute value data */
+ size_t prefixlen; /* length of "prefix" */
+
+ prefixlen = lwc_string_length(prefix);
+ if (prefixlen == 0) {
+ /* In this case, the spec says that "if 'val' is the
+ * empty string, it will never represent anything." */
+ return CSS_OK;
+ }
+
+ /* Intern the attribute name as a dom_string so we can
+ * use dom_element_get_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_get_attribute((dom_node *)node, name, &attr_val);
+ if ((err != DOM_NO_ERR) || (attr_val == NULL)) {
+ /* There was an error getting the attribute's value or
+ * the attribute doesn't exist. So, no match? */
+ dom_string_unref(name);
+ *match = false;
+ return CSS_OK;
+ }
+
+ /* Otherwise, we have the attribute value from the given node,
+ * and the first thing we want to do is check to see if the
+ * whole thing matches the prefix. */
+ dom_string_unref(name);
+ *match = dom_string_lwc_isequal(attr_val, prefix);
+
+ /* If not, check to see if an, uh, prefix matches the
+ * prefix */
+ if (*match == false) {
+ avdata = dom_string_data(attr_val);
+ avdata_len = dom_string_byte_length(attr_val);
+ if ((avdata_len >= prefixlen) &&
+ (strncasecmp(avdata,
+ lwc_string_data(prefix),
+ prefixlen) == 0)) {
+ /* Use strncasecmp to compare only the first
+ * "n" characters, where "n" is the length of
+ * the prefix. */
+ *match = true;
+ }
+ }
+
+ dom_string_unref(attr_val);
+
+ return CSS_OK;
+}
+
+
+/**
+ * Test the given node for an attribute whose value end with the
+ * given suffix
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name and whose value ends with
+ * the given suffix string. The comparison is case-sensitive. This
+ * corresponds to [attr$=value] in CSS.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node to test
+ * \param qname Attribute name to check for
+ * \param suffix Value suffix to check for
+ * \param match Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if we cannot
+ * intern the attribute name (which usually indicates memory
+ * exhaustion)
+ */
+css_error node_has_attribute_suffix(void *pw, void *node,
+ const css_qname *qname, lwc_string *suffix,
+ bool *match)
+{
+ UNUSED(pw);
+ dom_string *name;
+ dom_string *attr_val;
+ dom_exception err;
+ const char *avdata; /* attribute value data */
+ size_t avdata_len; /* length of that attribute value data */
+ size_t suffixlen; /* length of "suffix" */
+
+ /* convenience pointer we'll use when matching the suffix */
+ const char *suffix_start;
+
+ suffixlen = lwc_string_length(suffix);
+ if (suffixlen == 0) {
+ /* In this case, the spec says that "if 'val' is the
+ * empty string, it will never represent anything." */
+ return CSS_OK;
+ }
+
+ /* Intern the attribute name as a dom_string so we can
+ * use dom_element_get_attribute() */
+ err = dom_string_create_interned(
+ (const uint8_t *) lwc_string_data(qname->name),
+ lwc_string_length(qname->name),
+ &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ err = dom_element_get_attribute((dom_node *)node, name, &attr_val);
+ if ((err != DOM_NO_ERR) || (attr_val == NULL)) {
+ /* There was an error getting the attribute's value or
+ * the attribute doesn't exist. So, no match? */
+ dom_string_unref(name);
+ *match = false;
+ return CSS_OK;
+ }
+
+ /* Otherwise, we have the attribute value from the given node,
+ * and the first thing we want to do is check to see if the
+ * whole thing matches the suffix. */
+ dom_string_unref(name);
+ *match = dom_string_lwc_isequal(attr_val, suffix);
+
+ /* If not, check to see if an, uh, suffix matches the
+ * suffix */
+ if (*match == false) {
+ avdata = dom_string_data(attr_val);
+ avdata_len = dom_string_byte_length(attr_val);
+
+ suffix_start = (char *)(avdata + avdata_len - suffixlen);
+
+ if ((avdata_len >= suffixlen) &&
+ (strncasecmp(suffix_start,
+ lwc_string_data(suffix),
+ suffixlen) == 0)) {
+ /* Use strncasecmp to compare only the last
+ * "n" characters, where "n" is the length of
+ * the suffix. */
+ *match = true;
+ }
+ }
+
+ dom_string_unref(attr_val);
+
+ return CSS_OK;
+}
projects / libsvgtiny.git / blobdiff