/* * This file is part of NetSurf, http://netsurf.sourceforge.net/ * Licensed under the GNU General Public License, * http://www.opensource.org/licenses/gpl-license * Copyright 2004 James Bursa */ /** \file * CSS handling (implementation). * * See CSS 2.1 chapter 5 for the terms used here. * * CSS style sheets are stored as a hash table mapping selectors to styles. * Selectors are hashed by the type selector of the last simple * selector in the selector. The universal selector is hashed to * chain 0. * * A simple selector is a struct css_selector with type * CSS_SELECTOR_ELEMENT. The data field is the type selector, or 0 for * the universal selector. Any attribute selectors, ID * selectors, or pseudo-classes form a linked list of * css_selector hanging from detail. * * A selector is a linked list by the combiner field of these simple * selectors, in reverse order that they appear in the concrete syntax. The last * simple selector is first, then the previous one is linked at combiner and has * relationship comb to the last, etc. * * Selectors are then linked in each hash chain by next, in order of increasing * specificity. * * As an example, the stylesheet * \code * th { [1] } * div#id1 > h4.class1 { [2] } * center * { [3] } \endcode * * would result in a struct css_stylesheet (content::data.css.css) like this * \dot * digraph example { * node [shape=record, fontname=Helvetica, fontsize=9]; * edge [fontname=Helvetica, fontsize=9]; * css -> n0 [label="rule[0]"]; * css -> n2 [label="rule[29]"]; * * n0 [label="css_selector\ntype CSS_SELECTOR_ELEMENT\ldata 0\lcomb CSS_COMB_ANCESTOR\lspecificity 2\l"]; * n0 -> n1 [label="combiner"]; * n0 -> n0style [label="style"]; n0style [label="[3]"]; * * n1 [label="css_selector\ntype CSS_SELECTOR_ELEMENT\ldata \"center\"\lcomb CSS_COMB_NONE\lspecificity 1\l"]; * * n2 [label="css_selector\ntype CSS_SELECTOR_ELEMENT\ldata \"th\"\lcomb CSS_COMB_NONE\lspecificity 1\l"]; * n2 -> n3 [label="next"]; * n2 -> n2style [label="style"]; n2style [label="[1]"]; * * n3 [label="css_selector\ntype CSS_SELECTOR_ELEMENT\ldata \"h4\"\lcomb CSS_COMB_PARENT\lspecificity 0x10102\l"]; * n3 -> n4 [label="detail"]; * n3 -> n5 [label="combiner"]; * n3 -> n3style [label="style"]; n3style [label="[2]"]; * * n4 [label="css_selector\ntype CSS_SELECTOR_CLASS\ldata \"class1\"\lcomb CSS_COMB_NONE\lspecificity 0x100\l"]; * * n5 [label="css_selector\ntype CSS_SELECTOR_ELEMENT\ldata \"div\"\lcomb CSS_COMB_NONE\lspecificity 0x10001\l"]; * n5 -> n6 [label="detail"]; * * n6 [label="css_selector\ntype CSS_SELECTOR_ID\ldata \"#id1\"\lcomb CSS_COMB_NONE\lspecificity 0x10000\l"]; * } * \enddot * * (any fields not shown are 0). In this example the first two rules happen to * have hashed to the same value. */ #include #include #include #include #define CSS_INTERNALS #undef NDEBUG #include "netsurf/utils/config.h" #include "netsurf/content/content.h" #include "netsurf/content/fetch.h" #include "netsurf/content/fetchcache.h" #include "netsurf/css/css.h" #include "netsurf/css/parser.h" #ifdef riscos #include "netsurf/desktop/gui.h" #endif #include "netsurf/utils/log.h" #include "netsurf/utils/url.h" #include "netsurf/utils/utils.h" static void css_atimport_callback(content_msg msg, struct content *css, void *p1, void *p2, union content_msg_data data); static bool css_match_rule(struct css_selector *rule, xmlNode *element); static bool css_match_detail(const struct css_selector *detail, xmlNode *element); static void css_dump_length(const struct css_length * const length); static void css_dump_selector(const struct css_selector *r); /** Default style for a document. These are the 'Initial values' from the * spec. */ const struct css_style css_base_style = { 0xffffff, CSS_BACKGROUND_ATTACHMENT_SCROLL, { CSS_BACKGROUND_IMAGE_NONE, 0 }, { { CSS_BACKGROUND_POSITION_PERCENT, { 0.0 } }, { CSS_BACKGROUND_POSITION_PERCENT, { 0.0 } } }, CSS_BACKGROUND_REPEAT_REPEAT, { { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE } }, CSS_CLEAR_NONE, 0x000000, CSS_CURSOR_AUTO, CSS_DISPLAY_BLOCK, CSS_FLOAT_NONE, { CSS_FONT_SIZE_LENGTH, { { 10, CSS_UNIT_PT } } }, CSS_FONT_FAMILY_SANS_SERIF, CSS_FONT_WEIGHT_NORMAL, CSS_FONT_STYLE_NORMAL, CSS_FONT_VARIANT_NORMAL, { CSS_HEIGHT_AUTO, { 1, CSS_UNIT_EM } }, { CSS_LINE_HEIGHT_ABSOLUTE, { 1.3 } }, { { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } } }, { { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } } }, CSS_TEXT_ALIGN_LEFT, CSS_TEXT_DECORATION_NONE, { CSS_TEXT_INDENT_LENGTH, { { 0, CSS_UNIT_EM } } }, CSS_TEXT_TRANSFORM_NONE, CSS_VISIBILITY_VISIBLE, { CSS_WIDTH_AUTO, { { 1, CSS_UNIT_EM } } }, CSS_WHITE_SPACE_NORMAL }; /** Style with no values set. */ const struct css_style css_empty_style = { CSS_COLOR_INHERIT, CSS_BACKGROUND_ATTACHMENT_INHERIT, { CSS_BACKGROUND_IMAGE_INHERIT, 0 }, { { CSS_BACKGROUND_POSITION_INHERIT, { 0.0 } }, { CSS_BACKGROUND_POSITION_INHERIT, { 0.0 } } }, CSS_BACKGROUND_REPEAT_INHERIT, { { CSS_COLOR_INHERIT, { CSS_BORDER_WIDTH_INHERIT, { 0, CSS_UNIT_PX } }, CSS_BORDER_STYLE_INHERIT }, { CSS_COLOR_INHERIT, { CSS_BORDER_WIDTH_INHERIT, { 0, CSS_UNIT_PX } }, CSS_BORDER_STYLE_INHERIT }, { CSS_COLOR_INHERIT, { CSS_BORDER_WIDTH_INHERIT, { 0, CSS_UNIT_PX } }, CSS_BORDER_STYLE_INHERIT }, { CSS_COLOR_INHERIT, { CSS_BORDER_WIDTH_INHERIT, { 0, CSS_UNIT_PX } }, CSS_BORDER_STYLE_INHERIT } }, CSS_CLEAR_INHERIT, CSS_COLOR_INHERIT, CSS_CURSOR_INHERIT, CSS_DISPLAY_INHERIT, CSS_FLOAT_INHERIT, { CSS_FONT_SIZE_INHERIT, { { 1, CSS_UNIT_EM } } }, CSS_FONT_FAMILY_INHERIT, CSS_FONT_WEIGHT_INHERIT, CSS_FONT_STYLE_INHERIT, CSS_FONT_VARIANT_INHERIT, { CSS_HEIGHT_INHERIT, { 1, CSS_UNIT_EM } }, { CSS_LINE_HEIGHT_INHERIT, { 1.3 } }, { { CSS_MARGIN_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_INHERIT, { { 0, CSS_UNIT_PX } } } }, { { CSS_PADDING_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_INHERIT, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_INHERIT, { { 0, CSS_UNIT_PX } } } }, CSS_TEXT_ALIGN_INHERIT, CSS_TEXT_DECORATION_INHERIT, { CSS_TEXT_INDENT_INHERIT, { { 0, CSS_UNIT_EM } } }, CSS_TEXT_TRANSFORM_INHERIT, CSS_VISIBILITY_INHERIT, { CSS_WIDTH_INHERIT, { { 1, CSS_UNIT_EM } } }, CSS_WHITE_SPACE_INHERIT }; /** Default style for an element. These should be INHERIT if 'Inherited' is yes, * and the 'Initial value' otherwise. */ const struct css_style css_blank_style = { TRANSPARENT, CSS_BACKGROUND_ATTACHMENT_SCROLL, { CSS_BACKGROUND_IMAGE_NONE, 0 }, { { CSS_BACKGROUND_POSITION_PERCENT, { 0.0 } }, { CSS_BACKGROUND_POSITION_PERCENT, { 0.0 } } }, CSS_BACKGROUND_REPEAT_REPEAT, { { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE }, { 0x000000, { CSS_BORDER_WIDTH_LENGTH, { 2, CSS_UNIT_PX } }, CSS_BORDER_STYLE_NONE } }, CSS_CLEAR_NONE, CSS_COLOR_INHERIT, CSS_CURSOR_INHERIT, CSS_DISPLAY_INLINE, CSS_FLOAT_NONE, { CSS_FONT_SIZE_INHERIT, { { 1, CSS_UNIT_EM } } }, CSS_FONT_FAMILY_INHERIT, CSS_FONT_WEIGHT_INHERIT, CSS_FONT_STYLE_INHERIT, CSS_FONT_VARIANT_INHERIT, { CSS_HEIGHT_AUTO, { 1, CSS_UNIT_EM } }, { CSS_LINE_HEIGHT_INHERIT, { 1.3 } }, { { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_MARGIN_LENGTH, { { 0, CSS_UNIT_PX } } } }, { { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } }, { CSS_PADDING_LENGTH, { { 0, CSS_UNIT_PX } } } }, CSS_TEXT_ALIGN_INHERIT, CSS_TEXT_DECORATION_INHERIT, { CSS_TEXT_INDENT_INHERIT, { { 0, CSS_UNIT_EM } } }, CSS_TEXT_TRANSFORM_INHERIT, CSS_VISIBILITY_INHERIT, { CSS_WIDTH_AUTO, { { 1, CSS_UNIT_EM } } }, CSS_WHITE_SPACE_INHERIT }; /** * Convert a CONTENT_CSS for use. */ int css_convert(struct content *c, unsigned int width, unsigned int height) { unsigned char *source_data; unsigned char *current, *end, *token_text; unsigned int i; int token; void *parser; struct css_parser_params param = {false, c, 0, false, false}; struct css_parser_token token_data; c->data.css.css = malloc(sizeof *c->data.css.css); parser = css_parser_Alloc(malloc); source_data = realloc(c->source_data, c->source_size + 10); if (!c->data.css.css || !parser || !source_data) { free(c->data.css.css); css_parser_Free(parser, free); return 1; } for (i = 0; i != HASH_SIZE; i++) c->data.css.css->rule[i] = 0; c->data.css.import_count = 0; c->data.css.import_url = 0; c->data.css.import_content = 0; c->active = 0; c->source_data = source_data; for (i = 0; i != 10; i++) source_data[c->source_size + i] = 0; current = source_data; end = source_data + c->source_size; while (current < end && (token = css_tokenise(¤t, end + 10, &token_text))) { token_data.text = token_text; token_data.length = current - token_text; css_parser_(parser, token, token_data, ¶m); if (param.syntax_error) { LOG(("syntax error near offset %i", token_text - source_data)); param.syntax_error = false; } else if (param.memory_error) { LOG(("out of memory")); break; } } css_parser_(parser, 0, token_data, ¶m); css_parser_Free(parser, free); if (param.memory_error) return 1; /*css_dump_stylesheet(c->data.css.css);*/ /* complete fetch of any imported stylesheets */ while (c->active != 0) { LOG(("importing %i from '%s'", c->active, c->url)); fetch_poll(); gui_multitask(); } c->status = CONTENT_STATUS_DONE; return 0; } void css_revive(struct content *c, unsigned int width, unsigned int height) { unsigned int i; /* imported stylesheets */ for (i = 0; i != c->data.css.import_count; i++) { c->data.css.import_content[i] = fetchcache( c->data.css.import_url[i], c->url, css_atimport_callback, c, (void*)i, c->width, c->height, true #ifdef WITH_POST , 0, 0 #endif #ifdef WITH_COOKIES , false #endif ); if (c->data.css.import_content[i] == 0) continue; if (c->data.css.import_content[i]->status != CONTENT_STATUS_DONE) c->active++; } while (c->active != 0) { fetch_poll(); gui_multitask(); } } /** * Destroy a CONTENT_CSS and free all resources it owns. */ void css_destroy(struct content *c) { unsigned int i; struct css_selector *r; for (i = 0; i != HASH_SIZE; i++) { for (r = c->data.css.css->rule[i]; r != 0; r = r->next) { if (r->style->background_image.uri != NULL) free(r->style->background_image.uri); free(r->style); } css_free_selector(c->data.css.css->rule[i]); } free(c->data.css.css); /* imported stylesheets */ for (i = 0; i != c->data.css.import_count; i++) if (c->data.css.import_content[i] != 0) { free(c->data.css.import_url[i]); content_remove_user(c->data.css.import_content[i], css_atimport_callback, c, (void*)i); } free(c->data.css.import_url); free(c->data.css.import_content); } /** * Create a new struct css_node. * * \param type type of node * \param data string for data, not copied * \param data_length length of data * \return allocated node, or 0 if memory exhausted * * Used by the parser. */ struct css_node * css_new_node(struct content *stylesheet, css_node_type type, const char *data, unsigned int data_length) { struct css_node *node = malloc(sizeof *node); if (!node) return 0; node->type = type; node->data = data; node->data_length = data_length; node->value = 0; node->next = 0; node->comb = CSS_COMB_NONE; node->style = 0; node->specificity = 0; node->stylesheet = stylesheet; return node; } /** * Free a struct css_node recursively. * * \param node css_node to free * * Used by the parser. */ void css_free_node(struct css_node *node) { if (!node) return; if (node->value) css_free_node(node->value); if (node->next) css_free_node(node->next); free(node); } /** * Create a new struct css_selector. * * \param type type of selector * \param data string for data, not copied * \param data_length length of data * \return allocated selector, or 0 if memory exhausted */ struct css_selector * css_new_selector(css_selector_type type, const char *data, unsigned int data_length) { struct css_selector *node = malloc(sizeof *node); if (!node) return 0; node->type = type; node->data = data; node->data_length = data_length; node->data2 = 0; node->detail = 0; node->combiner = 0; node->next = 0; node->comb = CSS_COMB_NONE; node->style = 0; node->specificity = 0; return node; } /** * Free a struct css_selector recursively. * * \param node css_selector to free */ void css_free_selector(struct css_selector *node) { if (!node) return; if (node->detail) css_free_selector(node->detail); if (node->combiner) css_free_selector(node->combiner); if (node->next) css_free_selector(node->next); free(node); } /** * Process an \@import rule. */ void css_atimport(struct content *c, struct css_node *node) { const char *s; char *t, *url, *url1; bool string = false, screen = true; unsigned int i; char **import_url; struct content **import_content; LOG(("@import rule")); import_url = realloc(c->data.css.import_url, (c->data.css.import_count + 1) * sizeof(*c->data.css.import_url)); if (!import_url) { /** \todo report to user */ return; } c->data.css.import_url = import_url; import_content = realloc(c->data.css.import_content, (c->data.css.import_count + 1) * sizeof(*c->data.css.import_content)); if (!import_content) { /** \todo report to user */ return; } c->data.css.import_content = import_content; /* uri(...) or "..." */ switch (node->type) { case CSS_NODE_URI: LOG(("URI '%.*s'", node->data_length, node->data)); for (s = node->data + 4; *s == ' ' || *s == '\t' || *s == '\r' || *s == '\n' || *s == '\f'; s++) ; if (*s == '\'' || *s == '"') { string = true; s++; } url = strndup(s, node->data_length - (s - node->data)); if (!url) { /** \todo report to user */ return; } for (t = url + strlen(url) - 2; *t == ' ' || *t == '\t' || *t == '\r' || *t == '\n' || *t == '\f'; t--) ; if (string) *t = 0; else *(t + 1) = 0; break; case CSS_NODE_STRING: LOG(("STRING '%.*s'", node->data_length, node->data)); url = strndup(node->data, node->data_length); if (!url) { /** \todo report to user */ return; } break; default: return; } /* media not specified, 'screen', or 'all' */ for (node = node->next; node != 0; node = node->next) { screen = false; if (node->type != CSS_NODE_IDENT) { free(url); return; } LOG(("medium '%s'", node->data)); if ((node->data_length == 6 && strncmp(node->data, "screen", 6) == 0) || (node->data_length == 3 && strncmp(node->data, "all", 3) == 0)) { screen = true; break; } node = node->next; if (node == 0 || node->type != CSS_NODE_COMMA) { free(url); return; } } if (!screen) { free(url); return; } url1 = url_join(url, c->url); if (!url1) { free(url); return; } /* start the fetch */ c->data.css.import_count++; i = c->data.css.import_count - 1; c->data.css.import_url[i] = url1; c->data.css.import_content[i] = fetchcache( c->data.css.import_url[i], c->url, css_atimport_callback, c, (void*)i, c->width, c->height, true #ifdef WITH_POST , 0, 0 #endif #ifdef WITH_COOKIES , false #endif ); if (c->data.css.import_content[i] && c->data.css.import_content[i]->status != CONTENT_STATUS_DONE) c->active++; free(url); } /** * Fetchcache callback for imported stylesheets. */ void css_atimport_callback(content_msg msg, struct content *css, void *p1, void *p2, union content_msg_data data) { struct content *c = p1; unsigned int i = (unsigned int) p2; switch (msg) { case CONTENT_MSG_LOADING: if (css->type != CONTENT_CSS) { content_remove_user(css, css_atimport_callback, c, (void*)i); c->data.css.import_content[i] = 0; c->active--; c->error = 1; } break; case CONTENT_MSG_READY: break; case CONTENT_MSG_DONE: LOG(("got imported stylesheet '%s'", css->url)); /*css_dump_stylesheet(css->data.css);*/ c->active--; break; case CONTENT_MSG_ERROR: c->data.css.import_content[i] = 0; c->active--; c->error = 1; break; case CONTENT_MSG_STATUS: break; case CONTENT_MSG_REDIRECT: c->active--; free(c->data.css.import_url[i]); c->data.css.import_url[i] = strdup(data.redirect); if (!c->data.css.import_url[i]) { /** \todo report to user */ c->error = 1; return; } c->data.css.import_content[i] = fetchcache( c->data.css.import_url[i], c->url, css_atimport_callback, c, (void*)i, css->width, css->height, true #ifdef WITH_POST , 0, 0 #endif #ifdef WITH_COOKIES , false #endif ); if (c->data.css.import_content[i] && c->data.css.import_content[i]->status != CONTENT_STATUS_DONE) c->active++; break; default: assert(0); } } /** * Find the style which applies to an element. * * \param css content of type CONTENT_CSS * \param element element in xml tree to match * \param style style to update * * The style is updated with any rules that match the element. */ void css_get_style(struct content *css, xmlNode *element, struct css_style *style) { struct css_stylesheet *stylesheet = css->data.css.css; struct css_selector *rule; unsigned int hash, i; /* imported stylesheets */ for (i = 0; i != css->data.css.import_count; i++) if (css->data.css.import_content[i] != 0) css_get_style(css->data.css.import_content[i], element, style); /* match rules which end with the same element */ hash = css_hash((const char *) element->name, strlen((const char *) element->name)); for (rule = stylesheet->rule[hash]; rule; rule = rule->next) if (css_match_rule(rule, element)) css_merge(style, rule->style); /* match rules which apply to all elements */ for (rule = stylesheet->rule[0]; rule; rule = rule->next) if (css_match_rule(rule, element)) css_merge(style, rule->style); } /** * Determine if a rule applies to an element. */ bool css_match_rule(struct css_selector *rule, xmlNode *element) { struct css_selector *detail; xmlNode *anc, *prev; assert(element->type == XML_ELEMENT_NODE); if (rule->data && (rule->data_length != strlen((const char *) element->name) || strncasecmp(rule->data, (const char *) element->name, rule->data_length) != 0)) return false; for (detail = rule->detail; detail; detail = detail->next) { if (!css_match_detail(detail, element)) return false; } if (!rule->combiner) return true; switch (rule->comb) { case CSS_COMB_ANCESTOR: for (anc = element->parent; anc; anc = anc->parent) if (anc->type == XML_ELEMENT_NODE && css_match_rule(rule->combiner, anc)) return true; break; case CSS_COMB_PRECEDED: for (prev = element->prev; prev && prev->type != XML_ELEMENT_NODE; prev = prev->prev) ; if (!prev) return false; return css_match_rule(rule->combiner, prev); break; case CSS_COMB_PARENT: for (anc = element->parent; anc && anc->type != XML_ELEMENT_NODE; anc = anc->parent) ; if (!anc) return false; return css_match_rule(rule->combiner, anc); break; default: assert(0); } return false; } /** * Determine if a selector detail matches an element. * * \param detail a css_selector of type other than CSS_SELECTOR_ELEMENT * \param element element in xml tree to match * \return true if the selector matches the element */ bool css_match_detail(const struct css_selector *detail, xmlNode *element) { bool match = false; char *s = 0; char *space, *word; unsigned int length; switch (detail->type) { case CSS_SELECTOR_ID: s = (char *) xmlGetProp(element, (const xmlChar *) "id"); if (s && strlen(s) == detail->data_length && strncasecmp(detail->data, s, detail->data_length) == 0) match = true; break; case CSS_SELECTOR_CLASS: s = (char *) xmlGetProp(element, (const xmlChar *) "class"); if (!s) break; word = s; do { space = strchr(word, ' '); if (space) length = space - word; else length = strlen(word); if (length == detail->data_length && strncasecmp(word, detail->data, length) == 0) { match = true; break; } word = space + 1; } while (space); break; case CSS_SELECTOR_ATTRIB: /* matches if an attribute is present */ word = strndup(detail->data, detail->data_length); if (!word) { /** \todo report to user */ return false; } s = (char *) xmlGetProp(element, (const xmlChar *) word); free(word); if (s) match = true; break; case CSS_SELECTOR_ATTRIB_EQ: /* matches if an attribute has a certain value*/ word = strndup(detail->data, detail->data_length); if (!word) { /** \todo report to user */ return false; } s = (char *) xmlGetProp(element, (const xmlChar *) word); free(word); if (s && strlen(s) == detail->data2_length && strncasecmp(detail->data2, s, detail->data2_length) == 0) match = true; break; case CSS_SELECTOR_ATTRIB_INC: /* matches if one of the space separated words * in the attribute is equal */ word = strndup(detail->data, detail->data_length); if (!word) { /** \todo report to user */ return false; } s = (char *) xmlGetProp(element, (const xmlChar *) word); free(word); if (!s) break; word = s; do { space = strchr(word, ' '); if (space) length = space - word; else length = strlen(word); if (length == detail->data2_length && strncasecmp(word, detail->data2, length) == 0) { match = true; break; } word = space + 1; } while (space); break; case CSS_SELECTOR_ATTRIB_DM: /* matches if a prefix up to a hyphen matches */ word = strndup(detail->data, detail->data_length); if (!word) { /** \todo report to user */ return false; } s = (char *) xmlGetProp(element, (const xmlChar *) word); free(word); if (!s) break; length = detail->data2_length; if (strncasecmp(detail->data2, s, length) == 0 && (s[length] == '-' || s[length] == 0)) match = true; break; case CSS_SELECTOR_PSEUDO: break; default: assert(0); } if (s) xmlFree(s); return match; } /** * Parse a stand-alone CSS property list. * * \param style css_style to update * \param str property list, as found in HTML style attributes */ void css_parse_property_list(struct css_style * style, char * str) { unsigned char *source_data; unsigned char *current, *end, *token_text; size_t length; unsigned int i; int token; void *parser; struct css_parser_params param = {true, 0, 0, false, false}; struct css_parser_token token_data; const struct css_parser_token token_start = { "{", 1 }; const struct css_parser_token token_end = { "}", 1 }; length = strlen(str); parser = css_parser_Alloc(malloc); source_data = malloc(length + 10); if (!parser || !source_data) { free(parser); css_parser_Free(parser, free); return; } strcpy(source_data, str); for (i = 0; i != 10; i++) source_data[length + i] = 0; css_parser_(parser, LBRACE, token_start, ¶m); current = source_data; end = source_data + strlen(str); while (current < end && (token = css_tokenise(¤t, end + 10, &token_text))) { token_data.text = token_text; token_data.length = current - token_text; css_parser_(parser, token, token_data, ¶m); if (param.syntax_error) { LOG(("syntax error near offset %i", token_text - source_data)); param.syntax_error = false; } else if (param.memory_error) { LOG(("out of memory")); break; } } css_parser_(parser, RBRACE, token_end, ¶m); css_parser_(parser, 0, token_data, ¶m); css_parser_Free(parser, free); if (param.memory_error) { css_free_node(param.declaration); return; } css_add_declarations(style, param.declaration); css_free_node(param.declaration); free(source_data); } /** * Dump a css_style to stderr in CSS-like syntax. */ void css_dump_style(const struct css_style * const style) { unsigned int i; fprintf(stderr, "{ "); #define DUMP_COLOR(z, s) \ if (style->z != css_empty_style.z) { \ if (style->z == TRANSPARENT) \ fprintf(stderr, s ": transparent; "); \ else if (style->z == CSS_COLOR_NONE) \ fprintf(stderr, s ": none; "); \ else \ fprintf(stderr, s ": #%.6lx; ", style->z); \ } #define DUMP_KEYWORD(z, s, n) \ if (style->z != css_empty_style.z) \ fprintf(stderr, s ": %s; ", n[style->z]); DUMP_KEYWORD(background_attachment, "background-attachment", css_background_attachment_name); DUMP_COLOR(background_color, "background-color"); DUMP_KEYWORD(background_repeat, "background-repeat", css_background_repeat_name); DUMP_KEYWORD(clear, "clear", css_clear_name); DUMP_COLOR(color, "color"); DUMP_KEYWORD(cursor, "cursor", css_cursor_name); DUMP_KEYWORD(display, "display", css_display_name); DUMP_KEYWORD(float_, "float", css_float_name); if (style->font_style != css_empty_style.font_style || style->font_weight != css_empty_style.font_weight || style->font_size.size != css_empty_style.font_size.size || style->line_height.size != css_empty_style.line_height.size || style->font_family != css_empty_style.font_family || style->font_variant != css_empty_style.font_variant) { fprintf(stderr, "font: %s %s ", css_font_style_name[style->font_style], css_font_weight_name[style->font_weight]); switch (style->font_size.size) { case CSS_FONT_SIZE_ABSOLUTE: fprintf(stderr, "[%g]", style->font_size.value.absolute); break; case CSS_FONT_SIZE_LENGTH: css_dump_length(&style->font_size.value.length); break; case CSS_FONT_SIZE_PERCENT: fprintf(stderr, "%g%%", style->font_size.value.percent); break; case CSS_FONT_SIZE_INHERIT: fprintf(stderr, "inherit"); break; default: fprintf(stderr, "UNKNOWN"); break; } fprintf(stderr, "/"); switch (style->line_height.size) { case CSS_LINE_HEIGHT_ABSOLUTE: fprintf(stderr, "[%g]", style->line_height.value.absolute); break; case CSS_LINE_HEIGHT_LENGTH: css_dump_length(&style->line_height.value.length); break; case CSS_LINE_HEIGHT_PERCENT: fprintf(stderr, "%g%%", style->line_height.value.percent); break; case CSS_LINE_HEIGHT_INHERIT: fprintf(stderr, "inherit"); break; default: fprintf(stderr, "UNKNOWN"); break; } fprintf(stderr, " %s", css_font_family_name[style->font_family]); fprintf(stderr, " %s", css_font_variant_name[style->font_variant]); fprintf(stderr, "; "); } if (style->height.height != css_empty_style.height.height) { fprintf(stderr, "height: "); switch (style->height.height) { case CSS_HEIGHT_AUTO: fprintf(stderr, "auto"); break; case CSS_HEIGHT_LENGTH: css_dump_length(&style->height.length); break; default: fprintf(stderr, "UNKNOWN"); break; } fprintf(stderr, "; "); } if (style->margin[0].margin != css_empty_style.margin[0].margin || style->margin[1].margin != css_empty_style.margin[1].margin || style->margin[2].margin != css_empty_style.margin[2].margin || style->margin[3].margin != css_empty_style.margin[3].margin) { fprintf(stderr, "margin:"); for (i = 0; i != 4; i++) { switch (style->margin[i].margin) { case CSS_MARGIN_INHERIT: fprintf(stderr, " inherit"); break; case CSS_MARGIN_LENGTH: fprintf(stderr, " "); css_dump_length(&style->margin[i].value.length); break; case CSS_MARGIN_PERCENT: fprintf(stderr, " %g%%", style->margin[i].value.percent); break; case CSS_MARGIN_AUTO: fprintf(stderr, " auto"); break; default: fprintf(stderr, "UNKNOWN"); break; } } fprintf(stderr, "; "); } if (style->padding[0].padding != css_empty_style.padding[0].padding || style->padding[1].padding != css_empty_style.padding[1].padding || style->padding[2].padding != css_empty_style.padding[2].padding || style->padding[3].padding != css_empty_style.padding[3].padding) { fprintf(stderr, "padding:"); for (i = 0; i != 4; i++) { switch (style->padding[i].padding) { case CSS_PADDING_INHERIT: fprintf(stderr, " inherit"); break; case CSS_PADDING_LENGTH: fprintf(stderr, " "); css_dump_length(&style->padding[i].value.length); break; case CSS_PADDING_PERCENT: fprintf(stderr, " %g%%", style->padding[i].value.percent); break; default: fprintf(stderr, "UNKNOWN"); break; } } fprintf(stderr, "; "); } DUMP_KEYWORD(text_align, "text-align", css_text_align_name); if (style->text_decoration != css_empty_style.text_decoration) { fprintf(stderr, "text-decoration:"); if (style->text_decoration == CSS_TEXT_DECORATION_NONE) fprintf(stderr, " none"); if (style->text_decoration == CSS_TEXT_DECORATION_INHERIT) fprintf(stderr, " inherit"); if (style->text_decoration & CSS_TEXT_DECORATION_UNDERLINE) fprintf(stderr, " underline"); if (style->text_decoration & CSS_TEXT_DECORATION_OVERLINE) fprintf(stderr, " overline"); if (style->text_decoration & CSS_TEXT_DECORATION_LINE_THROUGH) fprintf(stderr, " line-through"); if (style->text_decoration & CSS_TEXT_DECORATION_BLINK) fprintf(stderr, " blink"); fprintf(stderr, "; "); } if (style->text_indent.size != css_empty_style.text_indent.size) { fprintf(stderr, "text-indent: "); switch (style->text_indent.size) { case CSS_TEXT_INDENT_LENGTH: css_dump_length(&style->text_indent.value.length); break; case CSS_TEXT_INDENT_PERCENT: fprintf(stderr, "%g%%", style->text_indent.value.percent); break; case CSS_TEXT_INDENT_INHERIT: fprintf(stderr, "inherit"); break; default: fprintf(stderr, "UNKNOWN"); break; } fprintf(stderr, "; "); } DUMP_KEYWORD(text_transform, "text-transform", css_text_transform_name); DUMP_KEYWORD(visibility, "visibility", css_visibility_name); if (style->width.width != css_empty_style.width.width) { fprintf(stderr, "width: "); switch (style->width.width) { case CSS_WIDTH_INHERIT: fprintf(stderr, "inherit"); break; case CSS_WIDTH_AUTO: fprintf(stderr, "auto"); break; case CSS_WIDTH_LENGTH: css_dump_length(&style->width.value.length); break; case CSS_WIDTH_PERCENT: fprintf(stderr, "%g%%", style->width.value.percent); break; default: fprintf(stderr, "UNKNOWN"); break; } fprintf(stderr, "; "); } DUMP_KEYWORD(white_space, "white-space", css_white_space_name); fprintf(stderr, "}"); } /** * Dump a css_length to stderr. */ void css_dump_length(const struct css_length * const length) { fprintf(stderr, "%g%s", length->value, css_unit_name[length->unit]); } /** * Dump a complete css_stylesheet to stderr in CSS syntax. */ void css_dump_stylesheet(const struct css_stylesheet * stylesheet) { unsigned int i; struct css_selector *r; for (i = 0; i != HASH_SIZE; i++) { /*fprintf(stderr, "hash %i:\n", i);*/ for (r = stylesheet->rule[i]; r != 0; r = r->next) { css_dump_selector(r); fprintf(stderr, " <%lx> ", r->specificity); css_dump_style(r->style); fprintf(stderr, "\n"); } } } /** * Dump a css_selector to stderr in CSS syntax. */ void css_dump_selector(const struct css_selector *r) { struct css_selector *m; if (r->combiner) css_dump_selector(r->combiner); switch (r->comb) { case CSS_COMB_NONE: break; case CSS_COMB_ANCESTOR: fprintf(stderr, " "); break; case CSS_COMB_PARENT: fprintf(stderr, " > "); break; case CSS_COMB_PRECEDED: fprintf(stderr, " + "); break; } if (r->data) fprintf(stderr, "%.*s", r->data_length, r->data); else fprintf(stderr, "*"); for (m = r->detail; m; m = m->next) { switch (m->type) { case CSS_SELECTOR_ID: fprintf(stderr, "#%.*s", m->data_length, m->data); break; case CSS_SELECTOR_CLASS: fprintf(stderr, ".%.*s", m->data_length, m->data); break; case CSS_SELECTOR_ATTRIB: fprintf(stderr, "[%.*s]", m->data_length, m->data); break; case CSS_SELECTOR_ATTRIB_EQ: fprintf(stderr, "[%.*s=%.*s]", m->data_length, m->data, m->data2_length, m->data2); break; case CSS_SELECTOR_ATTRIB_INC: fprintf(stderr, "[%.*s~=%.*s]", m->data_length, m->data, m->data2_length, m->data2); break; case CSS_SELECTOR_ATTRIB_DM: fprintf(stderr, "[%.*s|=%.*s]", m->data_length, m->data, m->data2_length, m->data2); break; case CSS_SELECTOR_PSEUDO: fprintf(stderr, ":%.*s", m->data_length, m->data); break; default: fprintf(stderr, "(unexpected detail)"); } } } /** * Cascade styles. * * \param style css_style to modify * \param apply css_style to cascade onto style * * Attributes which have the value 'inherit' in apply are unchanged in style. * Other attributes are copied to style, calculating percentages relative to * style where applicable. */ void css_cascade(struct css_style * const style, const struct css_style * const apply) { unsigned int i; float f; /* text-decoration: approximate CSS 2.1 by inheriting into inline elements */ if (apply->text_decoration != CSS_TEXT_DECORATION_INHERIT) style->text_decoration = apply->text_decoration; /* if (style->display == CSS_DISPLAY_INLINE && apply->display != CSS_DISPLAY_INLINE) style->text_decoration = CSS_TEXT_DECORATION_NONE;*/ if (apply->background_attachment != CSS_BACKGROUND_ATTACHMENT_INHERIT) style->background_attachment = apply->background_attachment; if (apply->background_color != CSS_COLOR_INHERIT) style->background_color = apply->background_color; if (apply->background_image.type != CSS_BACKGROUND_IMAGE_INHERIT) style->background_image = apply->background_image; if (apply->background_repeat != CSS_BACKGROUND_REPEAT_INHERIT) style->background_repeat = apply->background_repeat; if (apply->clear != CSS_CLEAR_INHERIT) style->clear = apply->clear; if (apply->color != CSS_COLOR_INHERIT) style->color = apply->color; if (apply->cursor != CSS_CURSOR_INHERIT) style->cursor = apply->cursor; if (apply->display != CSS_DISPLAY_INHERIT) style->display = apply->display; if (apply->float_ != CSS_FLOAT_INHERIT) style->float_ = apply->float_; if (apply->font_family != CSS_FONT_FAMILY_INHERIT) style->font_family = apply->font_family; if (apply->font_style != CSS_FONT_STYLE_INHERIT) style->font_style = apply->font_style; if (apply->font_weight != CSS_FONT_WEIGHT_INHERIT) style->font_weight = apply->font_weight; if (apply->font_variant != CSS_FONT_VARIANT_INHERIT) style->font_variant = apply->font_variant; if (apply->height.height != CSS_HEIGHT_INHERIT) style->height = apply->height; if (apply->line_height.size != CSS_LINE_HEIGHT_INHERIT) style->line_height = apply->line_height; if (apply->text_align != CSS_TEXT_ALIGN_INHERIT) style->text_align = apply->text_align; if (apply->text_indent.size != CSS_TEXT_INDENT_INHERIT) style->text_indent = apply->text_indent; if (apply->text_transform != CSS_TEXT_TRANSFORM_INHERIT) style->text_transform = apply->text_transform; if (apply->visibility != CSS_VISIBILITY_INHERIT) style->visibility = apply->visibility; if (apply->width.width != CSS_WIDTH_INHERIT) style->width = apply->width; if (apply->white_space != CSS_WHITE_SPACE_INHERIT) style->white_space = apply->white_space; /* background-position */ if (apply->background_position.horz.pos != CSS_BACKGROUND_POSITION_INHERIT) { style->background_position.horz = apply->background_position.horz; } if (apply->background_position.vert.pos != CSS_BACKGROUND_POSITION_INHERIT) { style->background_position.vert = apply->background_position.vert; } /* font-size */ f = apply->font_size.value.percent / 100; switch (apply->font_size.size) { case CSS_FONT_SIZE_ABSOLUTE: style->font_size = apply->font_size; break; case CSS_FONT_SIZE_LENGTH: switch (apply->font_size.value.length.unit) { case CSS_UNIT_EM: f = apply->font_size.value.length.value; break; case CSS_UNIT_EX: f = apply->font_size.value.length.value * 0.6 /*?*/; break; default: style->font_size = apply->font_size; } if ((apply->font_size.value.length.unit != CSS_UNIT_EM) && (apply->font_size.value.length.unit != CSS_UNIT_EX)) break; /* drop through if EM or EX */ case CSS_FONT_SIZE_PERCENT: switch (style->font_size.size) { case CSS_FONT_SIZE_ABSOLUTE: style->font_size.value.absolute *= f; break; case CSS_FONT_SIZE_LENGTH: style->font_size.value.length.value *= f; break; default: die("attempting percentage of unknown font-size"); } break; case CSS_FONT_SIZE_INHERIT: default: /* leave unchanged */ break; } for (i = 0; i != 4; i++) { if (apply->border[i].color != CSS_COLOR_INHERIT) style->border[i].color = apply->border[i].color; if (apply->border[i].width.width != CSS_BORDER_WIDTH_INHERIT) style->border[i].width = apply->border[i].width; if (apply->border[i].style != CSS_BORDER_STYLE_INHERIT) style->border[i].style = apply->border[i].style; if (apply->margin[i].margin != CSS_MARGIN_INHERIT) style->margin[i] = apply->margin[i]; if (apply->padding[i].padding != CSS_PADDING_INHERIT) style->padding[i] = apply->padding[i]; } } /** * Merge styles. * * \param style css_style to modify * \param apply css_style to merge onto style * * Attributes which have the value 'inherit' in apply are unchanged in style. * Other attributes are copied to style, overwriting it. */ void css_merge(struct css_style * const style, const struct css_style * const apply) { unsigned int i; if (apply->background_attachment != CSS_BACKGROUND_ATTACHMENT_INHERIT) style->background_attachment = apply->background_attachment; if (apply->background_color != CSS_COLOR_INHERIT) style->background_color = apply->background_color; if (apply->background_image.type != CSS_BACKGROUND_IMAGE_INHERIT) style->background_image = apply->background_image; if (apply->background_repeat != CSS_BACKGROUND_REPEAT_INHERIT) style->background_repeat = apply->background_repeat; if (apply->clear != CSS_CLEAR_INHERIT) style->clear = apply->clear; if (apply->color != CSS_COLOR_INHERIT) style->color = apply->color; if (apply->cursor != CSS_CURSOR_INHERIT) style->cursor = apply->cursor; if (apply->display != CSS_DISPLAY_INHERIT) style->display = apply->display; if (apply->float_ != CSS_FLOAT_INHERIT) style->float_ = apply->float_; if (apply->font_family != CSS_FONT_FAMILY_INHERIT) style->font_family = apply->font_family; if (apply->font_size.size != CSS_FONT_SIZE_INHERIT) style->font_size = apply->font_size; if (apply->font_style != CSS_FONT_STYLE_INHERIT) style->font_style = apply->font_style; if (apply->font_weight != CSS_FONT_WEIGHT_INHERIT) style->font_weight = apply->font_weight; if (apply->font_variant != CSS_FONT_VARIANT_INHERIT) style->font_variant = apply->font_variant; if (apply->height.height != CSS_HEIGHT_INHERIT) style->height = apply->height; if (apply->line_height.size != CSS_LINE_HEIGHT_INHERIT) style->line_height = apply->line_height; if (apply->text_align != CSS_TEXT_ALIGN_INHERIT) style->text_align = apply->text_align; if (apply->text_decoration != CSS_TEXT_DECORATION_INHERIT) style->text_decoration = apply->text_decoration; if (apply->text_indent.size != CSS_TEXT_INDENT_INHERIT) style->text_indent = apply->text_indent; if (apply->text_transform != CSS_TEXT_TRANSFORM_INHERIT) style->text_transform = apply->text_transform; if (apply->visibility != CSS_VISIBILITY_INHERIT) style->visibility = apply->visibility; if (apply->width.width != CSS_WIDTH_INHERIT) style->width = apply->width; if (apply->white_space != CSS_WHITE_SPACE_INHERIT) style->white_space = apply->white_space; /* background-position */ if (apply->background_position.horz.pos != CSS_BACKGROUND_POSITION_INHERIT) { style->background_position.horz = apply->background_position.horz; } if (apply->background_position.vert.pos != CSS_BACKGROUND_POSITION_INHERIT) { style->background_position.vert = apply->background_position.vert; } for (i = 0; i != 4; i++) { if (apply->border[i].color != CSS_COLOR_INHERIT) style->border[i].color = apply->border[i].color; if (apply->border[i].width.width != CSS_BORDER_WIDTH_INHERIT) style->border[i].width = apply->border[i].width; if (apply->border[i].style != CSS_BORDER_STYLE_INHERIT) style->border[i].style = apply->border[i].style; if (apply->margin[i].margin != CSS_MARGIN_INHERIT) style->margin[i] = apply->margin[i]; if (apply->padding[i].padding != CSS_PADDING_INHERIT) style->padding[i] = apply->padding[i]; } } /** * Calculate a hash for an element name. * * The hash is case-insensitive. */ unsigned int css_hash(const char *s, int length) { int i; unsigned int z = 0; if (s == 0) return 0; for (i = 0; i != length; i++) z += s[i] & 0x1f; /* lower 5 bits, case insensitive */ return (z % (HASH_SIZE - 1)) + 1; } /** * Convert a struct css_length to pixels. */ float len(struct css_length * length, struct css_style * style) { assert(!((length->unit == CSS_UNIT_EM || length->unit == CSS_UNIT_EX) && style == 0)); switch (length->unit) { case CSS_UNIT_EM: return length->value * len(&style->font_size.value.length, 0); case CSS_UNIT_EX: return length->value * len(&style->font_size.value.length, 0) * 0.6; case CSS_UNIT_PX: return length->value; case CSS_UNIT_IN: return length->value * 90.0; case CSS_UNIT_CM: return length->value * 35.0; case CSS_UNIT_MM: return length->value * 3.5; case CSS_UNIT_PT: return length->value * 90.0 / 72.0; case CSS_UNIT_PC: return length->value * 90.0 / 6.0; default: break; } return 0; } #ifdef DEBUG int main() { const char data[] = "h1 { blah: foo; display: block; }" "h1.c1 h2#id1 + h3, h4 h5.c2#id2 { size: 100mm; color: red }" "p { background-color: #123; clear: left; color: #ff0000; display: block;" "float: left; font-size: 150%; height: blah; line-height: 100;" "text-align: left right; width: 90%;}"; struct content c; css_create(&c); css_process_data(&c, data, 24); css_process_data(&c, data + 24, sizeof(data) - 25); css_convert(&c, 100, 100); return 0; } #endif