/* * This file is part of LibCSS. * Licensed under the MIT License, *		  http://www.opensource.org/licenses/mit-license.php * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org> */ #include <assert.h>#include <string.h> #include "bytecode/bytecode.h"#include "bytecode/opcodes.h"#include "parse/properties/properties.h"#include "parse/properties/utils.h" /** * Parse background * * \param c	  Parsing context * \param vector  Vector of tokens to process * \param ctx	  Pointer to vector iteration context * \param result  Pointer to location to receive resulting style * \return CSS_OK on success, *	   CSS_NOMEM on memory exhaustion, *	   CSS_INVALID if the input is not valid * * Post condition: \a *ctx is updated with the next token to process *		   If the input is invalid, then \a *ctx remains unchanged. */css_error css__parse_background(css_language *c,		const parserutils_vector *vector, int *ctx,		css_style *result){	int orig_ctx = *ctx;	int prev_ctx;	const css_token *token;	css_error error = CSS_OK;	bool attachment = true;	bool color = true;	bool image = true;	bool position = true;	bool repeat = true;	css_style * attachment_style;	css_style * color_style;	css_style * image_style;	css_style * position_style;	css_style * repeat_style;  	/* Firstly, handle inherit */	token = parserutils_vector_peek(vector, *ctx);	if (token == NULL) 		return CSS_INVALID;			if (is_css_inherit(c, token)) {		error = css_stylesheet_style_inherit(result, CSS_PROP_BACKGROUND_ATTACHMENT);		if (error != CSS_OK) 			return error; 		error = css_stylesheet_style_inherit(result, CSS_PROP_BACKGROUND_COLOR);		if (error != CSS_OK) 			return error;		 		error = css_stylesheet_style_inherit(result, CSS_PROP_BACKGROUND_IMAGE);		if (error != CSS_OK) 			return error; 		error = css_stylesheet_style_inherit(result, CSS_PROP_BACKGROUND_POSITION);		if (error != CSS_OK) 			return error; 		error = css_stylesheet_style_inherit(result, CSS_PROP_BACKGROUND_REPEAT);		if (error == CSS_OK) 			parserutils_vector_iterate(vector, ctx); 		return error;	}  	/* allocate styles */	error = css__stylesheet_style_create(c->sheet, &attachment_style);	if (error != CSS_OK) 		return error; 	error = css__stylesheet_style_create(c->sheet, &color_style);	if (error != CSS_OK) {		css__stylesheet_style_destroy(attachment_style);		return error;	} 	error = css__stylesheet_style_create(c->sheet, &image_style);	if (error != CSS_OK) {		css__stylesheet_style_destroy(attachment_style);		css__stylesheet_style_destroy(color_style);		return error;	} 	error = css__stylesheet_style_create(c->sheet, &position_style);	if (error != CSS_OK) {		css__stylesheet_style_destroy(attachment_style);		css__stylesheet_style_destroy(color_style);		css__stylesheet_style_destroy(image_style);		return error;	} 	error = css__stylesheet_style_create(c->sheet, &repeat_style);	if (error != CSS_OK) {		css__stylesheet_style_destroy(attachment_style);		css__stylesheet_style_destroy(color_style);		css__stylesheet_style_destroy(image_style);		css__stylesheet_style_destroy(position_style);		return error;	} 	/* Attempt to parse the various longhand properties */	do {		prev_ctx = *ctx;		error = CSS_OK; 		if (is_css_inherit(c, token)) {			error = CSS_INVALID;			goto css__parse_background_cleanup;		} 		/* Try each property parser in turn, but only if we		 * haven't already got a value for this property.		 */		if ((attachment) && 		    (error = css__parse_background_attachment(c, vector, ctx, 					    attachment_style)) == CSS_OK) {			attachment = false;		} else if ((color) && 			   (error = css__parse_background_color(c, vector, ctx,					    color_style)) == CSS_OK) {			color = false;		} else if ((image) && 			   (error = css__parse_background_image(c, vector, ctx,					    image_style)) == CSS_OK) {			image = false;		} else if ((position) &&			   (error = css__parse_background_position(c, vector, ctx, 					position_style)) == CSS_OK) {			position = false;		} else if ((repeat) &&			   (error = css__parse_background_repeat(c, vector, ctx, 					repeat_style)) == CSS_OK) {			repeat = false;		} 		if (error == CSS_OK) {			consumeWhitespace(vector, ctx); 			token = parserutils_vector_peek(vector, *ctx);		} else {			/* Forcibly cause loop to exit */			token = NULL;		}	} while (*ctx != prev_ctx && token != NULL); 	if (attachment) {		error = css__stylesheet_style_appendOPV(attachment_style, 				CSS_PROP_BACKGROUND_ATTACHMENT, 0, 				BACKGROUND_ATTACHMENT_SCROLL);		if (error != CSS_OK)			goto css__parse_background_cleanup;	} 	if (color) {		error = css__stylesheet_style_appendOPV(color_style, 				CSS_PROP_BACKGROUND_COLOR, 0, 				BACKGROUND_COLOR_TRANSPARENT);		if (error != CSS_OK)			goto css__parse_background_cleanup;	} 	if (image) {		error = css__stylesheet_style_appendOPV(image_style, 				CSS_PROP_BACKGROUND_IMAGE,				0, BACKGROUND_IMAGE_NONE);		if (error != CSS_OK)			goto css__parse_background_cleanup;	} 	if (position) {		error = css__stylesheet_style_appendOPV(position_style,				CSS_PROP_BACKGROUND_POSITION,				0, BACKGROUND_POSITION_HORZ_LEFT |				BACKGROUND_POSITION_VERT_TOP);		if (error != CSS_OK)			goto css__parse_background_cleanup;	} 	if (repeat) {		error = css__stylesheet_style_appendOPV(repeat_style, 				CSS_PROP_BACKGROUND_REPEAT,				0, BACKGROUND_REPEAT_REPEAT);		if (error != CSS_OK)			goto css__parse_background_cleanup;	} 	error = css__stylesheet_merge_style(result, attachment_style);	if (error != CSS_OK)		goto css__parse_background_cleanup; 	error = css__stylesheet_merge_style(result, color_style);	if (error != CSS_OK)		goto css__parse_background_cleanup; 	error = css__stylesheet_merge_style(result, image_style);	if (error != CSS_OK)		goto css__parse_background_cleanup; 	error = css__stylesheet_merge_style(result, position_style);	if (error != CSS_OK)		goto css__parse_background_cleanup; 	error = css__stylesheet_merge_style(result, repeat_style); css__parse_background_cleanup:	css__stylesheet_style_destroy(attachment_style);	css__stylesheet_style_destroy(color_style);	css__stylesheet_style_destroy(image_style);	css__stylesheet_style_destroy(position_style);	css__stylesheet_style_destroy(repeat_style); 	if (error != CSS_OK)		*ctx = orig_ctx; 	return error;  }