/* * 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 void *myrealloc(void *ptr, size_t len, void *pw);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,		lwc_string **name);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,		lwc_string *name,		void **ancestor);static css_error named_parent_node(void *pw, void *node,		lwc_string *name,		void **parent);static css_error named_sibling_node(void *pw, void *node,		lwc_string *name,		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, 		lwc_string *name, 		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,		lwc_string *name,		bool *match);static css_error node_has_attribute_equal(void *pw, void *node,		lwc_string *name,		lwc_string *value,		bool *match);static css_error node_has_attribute_dashmatch(void *pw, void *node,		lwc_string *name,		lwc_string *value,		bool *match);static css_error node_has_attribute_includes(void *pw, void *node,		lwc_string *name,		lwc_string *value,		bool *match);static css_error node_is_first_child(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_lang(void *pw, void *node,		lwc_string *lang, bool *match);static css_error node_presentational_hint(void *pw, void *node,		uint32_t property, css_hint *hint);static css_error ua_default_for_property(void *pw, uint32_t property,		css_hint *hint);static css_error compute_font_size(void *pw, const css_hint *parent,		css_hint *size); /* Table of function pointers for the LibCSS Select API. */static css_select_handler select_handler = {	node_name,	node_classes,	node_id,	named_ancestor_node,	named_parent_node,	named_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_is_first_child,	node_is_link,	node_is_visited,	node_is_hover,	node_is_active,	node_is_focus,	node_is_lang,	node_presentational_hint,	ua_default_for_property,	compute_font_size};  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; 	UNUSED(argc);	UNUSED(argv); 	/* create a stylesheet */	code = css_stylesheet_create(CSS_LEVEL_DEFAULT, "UTF-8", "", NULL,			false, false, myrealloc, 0, resolve_url, 0, NULL, NULL,			&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(myrealloc, 0, &select_ctx);	if (code != CSS_OK)		die("css_select_ctx_create", code);	code = css_select_ctx_append_sheet(select_ctx, sheet, CSS_ORIGIN_AUTHOR,			CSS_MEDIA_ALL);	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,				CSS_MEDIA_SCREEN, 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); 	return 0;}  void *myrealloc(void *ptr, size_t len, void *pw){	UNUSED(pw);	/*printf("myrealloc(%p, %zu)\n", ptr, len);*/ 	return realloc(ptr, len);}  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, lwc_string **name){	lwc_string *node = n;	UNUSED(pw);	*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,		lwc_string *name,		void **ancestor){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	*ancestor = NULL;	return CSS_OK;} css_error named_parent_node(void *pw, void *n,		lwc_string *name,		void **parent){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	*parent = NULL;	return CSS_OK;} css_error named_sibling_node(void *pw, void *n,		lwc_string *name,		void **sibling){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	*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,		lwc_string *name,		bool *match){	lwc_string *node = n;	UNUSED(pw);	assert(lwc_string_caseless_isequal(node, 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,		lwc_string *name,		bool *match){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	*match = false;	return CSS_OK;} css_error node_has_attribute_equal(void *pw, void *n,		lwc_string *name,		lwc_string *value,		bool *match){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	UNUSED(value);	*match = false;	return CSS_OK;} css_error node_has_attribute_dashmatch(void *pw, void *n,		lwc_string *name,		lwc_string *value,		bool *match){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	UNUSED(value);	*match = false;	return CSS_OK;} css_error node_has_attribute_includes(void *pw, void *n,		lwc_string *name,		lwc_string *value,		bool *match){	UNUSED(pw);	UNUSED(n);	UNUSED(name);	UNUSED(value);	*match = false;	return CSS_OK;} css_error node_is_first_child(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_link(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_visited(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_hover(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_active(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_focus(void *pw, void *n, bool *match){	UNUSED(pw);	UNUSED(n);	*match = false;	return CSS_OK;} css_error node_is_lang(void *pw, void *n,		lwc_string *lang,		bool *match){	UNUSED(pw);	UNUSED(n);	UNUSED(lang);	*match = false;	return CSS_OK;} css_error node_presentational_hint(void *pw, void *node,		uint32_t property, css_hint *hint){	UNUSED(pw);	UNUSED(node);	UNUSED(property);	UNUSED(hint);	return CSS_PROPERTY_NOT_SET;} css_error ua_default_for_property(void *pw, uint32_t property, css_hint *hint){	UNUSED(pw); 	if (property == CSS_PROP_COLOR) {		hint->data.color = 0x00000000;		hint->status = CSS_COLOR_COLOR;	} else if (property == CSS_PROP_FONT_FAMILY) {		hint->data.strings = NULL;		hint->status = CSS_FONT_FAMILY_SANS_SERIF;	} else if (property == CSS_PROP_QUOTES) {		/* Not exactly useful :) */		hint->data.strings = NULL;		hint->status = CSS_QUOTES_NONE;	} else if (property == CSS_PROP_VOICE_FAMILY) {		/** \todo Fix this when we have voice-family done */		hint->data.strings = NULL;		hint->status = 0;	} else {		return CSS_INVALID;	} 	return CSS_OK;}

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