/*
* This file is part of LibCSS.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2012 Michael Drake <tlsa@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 column-rule shorthand
*
* \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_column_rule(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;
bool color = true;
bool style = true;
bool width = true;
css_style *color_style;
css_style *style_style;
css_style *width_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_COLUMN_RULE_COLOR);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result,
CSS_PROP_COLUMN_RULE_STYLE);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result,
CSS_PROP_COLUMN_RULE_WIDTH);
if (error == CSS_OK)
parserutils_vector_iterate(vector, ctx);
return error;
}
/* Allocate for styles */
error = css__stylesheet_style_create(c->sheet, &color_style);
if (error != CSS_OK)
return error;
error = css__stylesheet_style_create(c->sheet, &style_style);
if (error != CSS_OK) {
css__stylesheet_style_destroy(color_style);
return error;
}
error = css__stylesheet_style_create(c->sheet, &width_style);
if (error != CSS_OK) {
css__stylesheet_style_destroy(color_style);
css__stylesheet_style_destroy(style_style);
return error;
}
/* Attempt to parse the various longhand properties */
do {
prev_ctx = *ctx;
error = CSS_OK;
/* Ensure that we're not about to parse another inherit */
token = parserutils_vector_peek(vector, *ctx);
if (token != NULL && is_css_inherit(c, token)) {
error = CSS_INVALID;
goto css__parse_column_rule_cleanup;
}
if ((color) &&
(error = css__parse_column_rule_color(c, vector,
ctx, color_style)) == CSS_OK) {
color = false;
} else if ((style) &&
(error = css__parse_column_rule_style(c, vector,
ctx, style_style)) == CSS_OK) {
style = false;
} else if ((width) &&
(error = css__parse_column_rule_width(c, vector,
ctx, width_style)) == CSS_OK) {
width = 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);
/* Set unset properties to initial values */
if (color) {
error = css__stylesheet_style_appendOPV(color_style,
CSS_PROP_COLUMN_RULE_COLOR, 0,
COLUMN_RULE_COLOR_SET);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
/** TODO: initial colour should be the UA-defined initial
* value of the "color" property, not "0" */
error = css__stylesheet_style_append(color_style, 0x00000000);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
}
if (style) {
error = css__stylesheet_style_appendOPV(style_style,
CSS_PROP_COLUMN_RULE_STYLE, 0,
COLUMN_RULE_STYLE_NONE);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
}
if (width) {
error = css__stylesheet_style_appendOPV(width_style,
CSS_PROP_COLUMN_RULE_WIDTH, 0,
COLUMN_RULE_WIDTH_MEDIUM);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
}
/* Merge styles into the result */
error = css__stylesheet_merge_style(result, color_style);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
error = css__stylesheet_merge_style(result, style_style);
if (error != CSS_OK)
goto css__parse_column_rule_cleanup;
error = css__stylesheet_merge_style(result, width_style);
css__parse_column_rule_cleanup:
css__stylesheet_style_destroy(width_style);
css__stylesheet_style_destroy(style_style);
css__stylesheet_style_destroy(color_style);
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}