X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=5dbb83e1f7d182d2f296b6d3d8688ce468d42bb4;hb=a2b2d9e18bffd3426123343c93c4f805e3ec5aad;hp=6d345a753dacf4764cb3353ce983a1a8e651241c;hpb=49fb0b4d04ca7e1bfb54a1021e469ed7ef7bf3f5;p=libsvgtiny.git diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c index 6d345a7..5dbb83e 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" @@ -19,6 +20,16 @@ static css_error node_has_name(void *pw, void *node, 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); /** @@ -580,3 +591,230 @@ css_error node_has_class(void *pw, void *node, 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; +}