/* * LibCSS - example1.c * * Compile this using a command such as: * gcc -g -W -Wall -o example1 example1.c `pkg-config --cflags --libs libcss` */ #include <assert.h>#include <stdio.h>#include <string.h> /* The entire API is available through this header. */#include <libcss/libcss.h> /* This macro is used to silence compiler warnings about unused function * arguments. */#define UNUSED(x) ((x) = (x)) /* Function declarations. */static css_error resolve_url(void *pw, const char *base, lwc_string *rel, lwc_string **abs);static void die(const char *text, css_error code); static css_error node_name(void *pw, void *node, css_qname *qname);static css_error node_classes(void *pw, void *node, lwc_string ***classes, uint32_t *n_classes);static css_error node_id(void *pw, void *node, lwc_string **id);static css_error named_ancestor_node(void *pw, void *node, const css_qname *qname, void **ancestor);static css_error named_parent_node(void *pw, void *node, const css_qname *qname, void **parent);static css_error named_sibling_node(void *pw, void *node, const css_qname *qname, void **sibling);static css_error named_generic_sibling_node(void *pw, void *node, const css_qname *qname, void **sibling);static css_error parent_node(void *pw, void *node, void **parent);static css_error sibling_node(void *pw, void *node, void **sibling);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);static css_error node_has_attribute_includes(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match);static css_error node_has_attribute_prefix(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match);static css_error node_has_attribute_suffix(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match);static css_error node_has_attribute_substring(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match);static css_error node_is_root(void *pw, void *node, bool *match);static css_error node_count_siblings(void *pw, void *node, bool same_name, bool after, int32_t *count);static css_error node_is_empty(void *pw, void *node, bool *match);static css_error node_is_link(void *pw, void *node, bool *match);static css_error node_is_visited(void *pw, void *node, bool *match);static css_error node_is_hover(void *pw, void *node, bool *match);static css_error node_is_active(void *pw, void *node, bool *match);static css_error node_is_focus(void *pw, void *node, bool *match);static css_error node_is_enabled(void *pw, void *node, bool *match);static css_error node_is_disabled(void *pw, void *node, bool *match);static css_error node_is_checked(void *pw, void *node, bool *match);static css_error node_is_target(void *pw, void *node, bool *match);static css_error node_is_lang(void *pw, void *node, lwc_string *lang, bool *match);static css_error node_presentational_hint(void *pw, void *node, uint32_t *nhints, css_hint **hints);static css_error ua_default_for_property(void *pw, uint32_t property, css_hint *hint);static css_error set_libcss_node_data(void *pw, void *n, void *libcss_node_data);static css_error get_libcss_node_data(void *pw, void *n, void **libcss_node_data); static css_unit_ctx unit_len_ctx = { .viewport_width = 800 * (1 << CSS_RADIX_POINT), .viewport_height = 600 * (1 << CSS_RADIX_POINT), .font_size_default = 16 * (1 << CSS_RADIX_POINT), .font_size_minimum = 6 * (1 << CSS_RADIX_POINT), .device_dpi = 96 * (1 << CSS_RADIX_POINT), .root_style = NULL, /* We don't have a root node yet. */ .pw = NULL, /* We're not implementing measure callback */ .measure = NULL, /* We're not implementing measure callback */}; /* Table of function pointers for the LibCSS Select API. */static css_select_handler select_handler = { CSS_SELECT_HANDLER_VERSION_1, node_name, node_classes, node_id, named_ancestor_node, named_parent_node, named_sibling_node, named_generic_sibling_node, parent_node, sibling_node, node_has_name, node_has_class, node_has_id, node_has_attribute, node_has_attribute_equal, node_has_attribute_dashmatch, node_has_attribute_includes, node_has_attribute_prefix, node_has_attribute_suffix, node_has_attribute_substring, node_is_root, node_count_siblings, node_is_empty, node_is_link, node_is_visited, node_is_hover, node_is_active, node_is_focus, node_is_enabled, node_is_disabled, node_is_checked, node_is_target, node_is_lang, node_presentational_hint, ua_default_for_property, set_libcss_node_data, get_libcss_node_data,}; /* LWC leak callback */void lwc_callback(lwc_string *str, void *pw){ (void)(pw); fprintf(stderr, "Leaked string: %.*s\n", (int)lwc_string_length(str), lwc_string_data(str));} int main(int argc, char **argv){ css_error code; css_stylesheet *sheet; size_t size; const char data[] = "h1 { color: red } " "h4 { color: #321; } " "h4, h5 { color: #123456; }"; css_select_ctx *select_ctx; uint32_t count; unsigned int hh; css_stylesheet_params params; css_media media = { .type = CSS_MEDIA_SCREEN, }; UNUSED(argc); UNUSED(argv); params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1; params.level = CSS_LEVEL_21; params.charset = "UTF-8"; params.url = "foo"; params.title = "foo"; params.allow_quirks = false; params.inline_style = false; params.resolve = resolve_url; params.resolve_pw = NULL; params.import = NULL; params.import_pw = NULL; params.color = NULL; params.color_pw = NULL; params.font = NULL; params.font_pw = NULL; /* create a stylesheet */ code = css_stylesheet_create(¶ms, &sheet); if (code != CSS_OK) die("css_stylesheet_create", code); code = css_stylesheet_size(sheet, &size); if (code != CSS_OK) die("css_stylesheet_size", code); printf("created stylesheet, size %zu\n", size); /* parse some CSS source */ code = css_stylesheet_append_data(sheet, (const uint8_t *) data, sizeof data); if (code != CSS_OK && code != CSS_NEEDDATA) die("css_stylesheet_append_data", code); code = css_stylesheet_data_done(sheet); if (code != CSS_OK) die("css_stylesheet_data_done", code); code = css_stylesheet_size(sheet, &size); if (code != CSS_OK) die("css_stylesheet_size", code); printf("appended data, size now %zu\n", size); /* prepare a selection context containing the stylesheet */ code = css_select_ctx_create(&select_ctx); if (code != CSS_OK) die("css_select_ctx_create", code); code = css_select_ctx_append_sheet(select_ctx, sheet, CSS_ORIGIN_AUTHOR, NULL); if (code != CSS_OK) die("css_select_ctx_append_sheet", code); code = css_select_ctx_count_sheets(select_ctx, &count); if (code != CSS_OK) die("css_select_ctx_count_sheets", code); printf("created selection context with %i sheets\n", count); /* select style for each of h1 to h6 */ for (hh = 1; hh != 7; hh++) { css_select_results *style; char element[20]; lwc_string *element_name; uint8_t color_type; css_color color_shade; /* in this very simple example our "document tree" is just one * node and is in fact a libwapcaplet string containing the * element name */ snprintf(element, sizeof element, "h%i", hh); lwc_intern_string(element, strlen(element), &element_name); code = css_select_style(select_ctx, element_name, &unit_len_ctx, &media, NULL, &select_handler, 0, &style); if (code != CSS_OK) die("css_select_style", code); lwc_string_unref(element_name); color_type = css_computed_color( style->styles[CSS_PSEUDO_ELEMENT_NONE], &color_shade); if (color_type == CSS_COLOR_INHERIT) printf("color of h%i is 'inherit'\n", hh); else printf("color of h%i is %x\n", hh, color_shade); code = css_select_results_destroy(style); if (code != CSS_OK) die("css_computed_style_destroy", code); } /* free everything and shut down libcss */ code = css_select_ctx_destroy(select_ctx); if (code != CSS_OK) die("css_select_ctx_destroy", code); code = css_stylesheet_destroy(sheet); if (code != CSS_OK) die("css_stylesheet_destroy", code); lwc_iterate_strings(lwc_callback, NULL); return 0;} css_error resolve_url(void *pw, const char *base, lwc_string *rel, lwc_string **abs){ UNUSED(pw); UNUSED(base); /* About as useless as possible */ *abs = lwc_string_ref(rel); return CSS_OK;} void die(const char *text, css_error code){ fprintf(stderr, "ERROR: %s: %i: %s\n", text, code, css_error_to_string(code)); exit(EXIT_FAILURE);} /* Select handlers. Our "document tree" is actually just a single node, which is * a libwapcaplet string containing the element name. Therefore all the * functions below except those getting or testing the element name return empty * data or false attributes. */css_error node_name(void *pw, void *n, css_qname *qname){ lwc_string *node = n; UNUSED(pw); qname->name = lwc_string_ref(node); return CSS_OK;} css_error node_classes(void *pw, void *n, lwc_string ***classes, uint32_t *n_classes){ UNUSED(pw); UNUSED(n); *classes = NULL; *n_classes = 0; return CSS_OK;} css_error node_id(void *pw, void *n, lwc_string **id){ UNUSED(pw); UNUSED(n); *id = NULL; return CSS_OK;} css_error named_ancestor_node(void *pw, void *n, const css_qname *qname, void **ancestor){ UNUSED(pw); UNUSED(n); UNUSED(qname); *ancestor = NULL; return CSS_OK;} css_error named_parent_node(void *pw, void *n, const css_qname *qname, void **parent){ UNUSED(pw); UNUSED(n); UNUSED(qname); *parent = NULL; return CSS_OK;} css_error named_generic_sibling_node(void *pw, void *n, const css_qname *qname, void **sibling){ UNUSED(pw); UNUSED(n); UNUSED(qname); *sibling = NULL; return CSS_OK;} css_error named_sibling_node(void *pw, void *n, const css_qname *qname, void **sibling){ UNUSED(pw); UNUSED(n); UNUSED(qname); *sibling = NULL; return CSS_OK;} css_error parent_node(void *pw, void *n, void **parent){ UNUSED(pw); UNUSED(n); *parent = NULL; return CSS_OK;} css_error sibling_node(void *pw, void *n, void **sibling){ UNUSED(pw); UNUSED(n); *sibling = NULL; return CSS_OK;} css_error node_has_name(void *pw, void *n, const css_qname *qname, bool *match){ lwc_string *node = n; UNUSED(pw); assert(lwc_string_caseless_isequal(node, qname->name, match) == lwc_error_ok); return CSS_OK;} css_error node_has_class(void *pw, void *n, lwc_string *name, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(name); *match = false; return CSS_OK;} css_error node_has_id(void *pw, void *n, lwc_string *name, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(name); *match = false; return CSS_OK;} css_error node_has_attribute(void *pw, void *n, const css_qname *qname, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(qname); *match = false; return CSS_OK;} css_error node_has_attribute_equal(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK;} css_error node_has_attribute_dashmatch(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK;} css_error node_has_attribute_includes(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK;} css_error node_has_attribute_prefix(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match){ UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false;Lines 1–500 of 707. 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/* * LibCSS - example1.c * * Compile this using a command such as: * gcc -g -W -Wall -o example1 example1.c `pkg-config --cflags --libs libcss` */ #include <assert.h> #include <stdio.h> #include <string.h> /* The entire API is available through this header. */ #include <libcss/libcss.h> /* This macro is used to silence compiler warnings about unused function * arguments. */ #define UNUSED(x) ((x) = (x)) /* Function declarations. */ static css_error resolve_url(void *pw, const char *base, lwc_string *rel, lwc_string **abs); static void die(const char *text, css_error code); static css_error node_name(void *pw, void *node, css_qname *qname); static css_error node_classes(void *pw, void *node, lwc_string ***classes, uint32_t *n_classes); static css_error node_id(void *pw, void *node, lwc_string **id); static css_error named_ancestor_node(void *pw, void *node, const css_qname *qname, void **ancestor); static css_error named_parent_node(void *pw, void *node, const css_qname *qname, void **parent); static css_error named_sibling_node(void *pw, void *node, const css_qname *qname, void **sibling); static css_error named_generic_sibling_node(void *pw, void *node, const css_qname *qname, void **sibling); static css_error parent_node(void *pw, void *node, void **parent); static css_error sibling_node(void *pw, void *node, void **sibling); 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); static css_error node_has_attribute_includes(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match); static css_error node_has_attribute_prefix(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match); static css_error node_has_attribute_suffix(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match); static css_error node_has_attribute_substring(void *pw, void *node, const css_qname *qname, lwc_string *value, bool *match); static css_error node_is_root(void *pw, void *node, bool *match); static css_error node_count_siblings(void *pw, void *node, bool same_name, bool after, int32_t *count); static css_error node_is_empty(void *pw, void *node, bool *match); static css_error node_is_link(void *pw, void *node, bool *match); static css_error node_is_visited(void *pw, void *node, bool *match); static css_error node_is_hover(void *pw, void *node, bool *match); static css_error node_is_active(void *pw, void *node, bool *match); static css_error node_is_focus(void *pw, void *node, bool *match); static css_error node_is_enabled(void *pw, void *node, bool *match); static css_error node_is_disabled(void *pw, void *node, bool *match); static css_error node_is_checked(void *pw, void *node, bool *match); static css_error node_is_target(void *pw, void *node, bool *match); static css_error node_is_lang(void *pw, void *node, lwc_string *lang, bool *match); static css_error node_presentational_hint(void *pw, void *node, uint32_t *nhints, css_hint **hints); static css_error ua_default_for_property(void *pw, uint32_t property, css_hint *hint); static css_error set_libcss_node_data(void *pw, void *n, void *libcss_node_data); static css_error get_libcss_node_data(void *pw, void *n, void **libcss_node_data); static css_unit_ctx unit_len_ctx = { .viewport_width = 800 * (1 << CSS_RADIX_POINT), .viewport_height = 600 * (1 << CSS_RADIX_POINT), .font_size_default = 16 * (1 << CSS_RADIX_POINT), .font_size_minimum = 6 * (1 << CSS_RADIX_POINT), .device_dpi = 96 * (1 << CSS_RADIX_POINT), .root_style = NULL, /* We don't have a root node yet. */ .pw = NULL, /* We're not implementing measure callback */ .measure = NULL, /* We're not implementing measure callback */ }; /* Table of function pointers for the LibCSS Select API. */ static css_select_handler select_handler = { CSS_SELECT_HANDLER_VERSION_1, node_name, node_classes, node_id, named_ancestor_node, named_parent_node, named_sibling_node, named_generic_sibling_node, parent_node, sibling_node, node_has_name, node_has_class, node_has_id, node_has_attribute, node_has_attribute_equal, node_has_attribute_dashmatch, node_has_attribute_includes, node_has_attribute_prefix, node_has_attribute_suffix, node_has_attribute_substring, node_is_root, node_count_siblings, node_is_empty, node_is_link, node_is_visited, node_is_hover, node_is_active, node_is_focus, node_is_enabled, node_is_disabled, node_is_checked, node_is_target, node_is_lang, node_presentational_hint, ua_default_for_property, set_libcss_node_data, get_libcss_node_data, }; /* LWC leak callback */ void lwc_callback(lwc_string *str, void *pw) { (void)(pw); fprintf(stderr, "Leaked string: %.*s\n", (int)lwc_string_length(str), lwc_string_data(str)); } int main(int argc, char **argv) { css_error code; css_stylesheet *sheet; size_t size; const char data[] = "h1 { color: red } " "h4 { color: #321; } " "h4, h5 { color: #123456; }"; css_select_ctx *select_ctx; uint32_t count; unsigned int hh; css_stylesheet_params params; css_media media = { .type = CSS_MEDIA_SCREEN, }; UNUSED(argc); UNUSED(argv); params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1; params.level = CSS_LEVEL_21; params.charset = "UTF-8"; params.url = "foo"; params.title = "foo"; params.allow_quirks = false; params.inline_style = false; params.resolve = resolve_url; params.resolve_pw = NULL; params.import = NULL; params.import_pw = NULL; params.color = NULL; params.color_pw = NULL; params.font = NULL; params.font_pw = NULL; /* create a stylesheet */ code = css_stylesheet_create(¶ms, &sheet); if (code != CSS_OK) die("css_stylesheet_create", code); code = css_stylesheet_size(sheet, &size); if (code != CSS_OK) die("css_stylesheet_size", code); printf("created stylesheet, size %zu\n", size); /* parse some CSS source */ code = css_stylesheet_append_data(sheet, (const uint8_t *) data, sizeof data); if (code != CSS_OK && code != CSS_NEEDDATA) die("css_stylesheet_append_data", code); code = css_stylesheet_data_done(sheet); if (code != CSS_OK) die("css_stylesheet_data_done", code); code = css_stylesheet_size(sheet, &size); if (code != CSS_OK) die("css_stylesheet_size", code); printf("appended data, size now %zu\n", size); /* prepare a selection context containing the stylesheet */ code = css_select_ctx_create(&select_ctx); if (code != CSS_OK) die("css_select_ctx_create", code); code = css_select_ctx_append_sheet(select_ctx, sheet, CSS_ORIGIN_AUTHOR, NULL); if (code != CSS_OK) die("css_select_ctx_append_sheet", code); code = css_select_ctx_count_sheets(select_ctx, &count); if (code != CSS_OK) die("css_select_ctx_count_sheets", code); printf("created selection context with %i sheets\n", count); /* select style for each of h1 to h6 */ for (hh = 1; hh != 7; hh++) { css_select_results *style; char element[20]; lwc_string *element_name; uint8_t color_type; css_color color_shade; /* in this very simple example our "document tree" is just one * node and is in fact a libwapcaplet string containing the * element name */ snprintf(element, sizeof element, "h%i", hh); lwc_intern_string(element, strlen(element), &element_name); code = css_select_style(select_ctx, element_name, &unit_len_ctx, &media, NULL, &select_handler, 0, &style); if (code != CSS_OK) die("css_select_style", code); lwc_string_unref(element_name); color_type = css_computed_color( style->styles[CSS_PSEUDO_ELEMENT_NONE], &color_shade); if (color_type == CSS_COLOR_INHERIT) printf("color of h%i is 'inherit'\n", hh); else printf("color of h%i is %x\n", hh, color_shade); code = css_select_results_destroy(style); if (code != CSS_OK) die("css_computed_style_destroy", code); } /* free everything and shut down libcss */ code = css_select_ctx_destroy(select_ctx); if (code != CSS_OK) die("css_select_ctx_destroy", code); code = css_stylesheet_destroy(sheet); if (code != CSS_OK) die("css_stylesheet_destroy", code); lwc_iterate_strings(lwc_callback, NULL); return 0; } css_error resolve_url(void *pw, const char *base, lwc_string *rel, lwc_string **abs) { UNUSED(pw); UNUSED(base); /* About as useless as possible */ *abs = lwc_string_ref(rel); return CSS_OK; } void die(const char *text, css_error code) { fprintf(stderr, "ERROR: %s: %i: %s\n", text, code, css_error_to_string(code)); exit(EXIT_FAILURE); } /* Select handlers. Our "document tree" is actually just a single node, which is * a libwapcaplet string containing the element name. Therefore all the * functions below except those getting or testing the element name return empty * data or false attributes. */ css_error node_name(void *pw, void *n, css_qname *qname) { lwc_string *node = n; UNUSED(pw); qname->name = lwc_string_ref(node); return CSS_OK; } css_error node_classes(void *pw, void *n, lwc_string ***classes, uint32_t *n_classes) { UNUSED(pw); UNUSED(n); *classes = NULL; *n_classes = 0; return CSS_OK; } css_error node_id(void *pw, void *n, lwc_string **id) { UNUSED(pw); UNUSED(n); *id = NULL; return CSS_OK; } css_error named_ancestor_node(void *pw, void *n, const css_qname *qname, void **ancestor) { UNUSED(pw); UNUSED(n); UNUSED(qname); *ancestor = NULL; return CSS_OK; } css_error named_parent_node(void *pw, void *n, const css_qname *qname, void **parent) { UNUSED(pw); UNUSED(n); UNUSED(qname); *parent = NULL; return CSS_OK; } css_error named_generic_sibling_node(void *pw, void *n, const css_qname *qname, void **sibling) { UNUSED(pw); UNUSED(n); UNUSED(qname); *sibling = NULL; return CSS_OK; } css_error named_sibling_node(void *pw, void *n, const css_qname *qname, void **sibling) { UNUSED(pw); UNUSED(n); UNUSED(qname); *sibling = NULL; return CSS_OK; } css_error parent_node(void *pw, void *n, void **parent) { UNUSED(pw); UNUSED(n); *parent = NULL; return CSS_OK; } css_error sibling_node(void *pw, void *n, void **sibling) { UNUSED(pw); UNUSED(n); *sibling = NULL; return CSS_OK; } css_error node_has_name(void *pw, void *n, const css_qname *qname, bool *match) { lwc_string *node = n; UNUSED(pw); assert(lwc_string_caseless_isequal(node, qname->name, match) == lwc_error_ok); return CSS_OK; } css_error node_has_class(void *pw, void *n, lwc_string *name, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(name); *match = false; return CSS_OK; } css_error node_has_id(void *pw, void *n, lwc_string *name, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(name); *match = false; return CSS_OK; } css_error node_has_attribute(void *pw, void *n, const css_qname *qname, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(qname); *match = false; return CSS_OK; } css_error node_has_attribute_equal(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK; } css_error node_has_attribute_dashmatch(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK; } css_error node_has_attribute_includes(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false; return CSS_OK; } css_error node_has_attribute_prefix(void *pw, void *n, const css_qname *qname, lwc_string *value, bool *match) { UNUSED(pw); UNUSED(n); UNUSED(qname); UNUSED(value); *match = false;