X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=246309867a691f87b51e9143f17652c2350848f0;hb=4b509c8176d14bed97304aa2bf268bc759cfe09f;hp=0267325df7a7a7b202a36ffd1434e233a644469e;hpb=dcd18c90ee670c7b341b6856aaf75e0e0dfd0d37;p=libsvgtiny.git diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c index 0267325..2463098 100644 --- a/src/svgtiny_css.c +++ b/src/svgtiny_css.c @@ -1,4 +1,5 @@ #include +#include /* strncasecmp */ #include "svgtiny.h" #include "svgtiny_internal.h" @@ -23,6 +24,21 @@ 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); /** @@ -665,3 +681,415 @@ css_error node_has_attribute(void *pw, void *node, 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; +}