/*
* 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;
}