/*
* 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 columns 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_columns(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 width = true;
bool count = true;
css_style *width_style;
css_style *count_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_WIDTH);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result,
CSS_PROP_COLUMN_COUNT);
if (error == CSS_OK)
parserutils_vector_iterate(vector, ctx);
return error;
}
/* Allocate for styles */
error = css__stylesheet_style_create(c->sheet, &width_style);
if (error != CSS_OK)
return error;
error = css__stylesheet_style_create(c->sheet, &count_style);
if (error != CSS_OK) {
css__stylesheet_style_destroy(width_style);
return error;
}
/* Attempt to parse the various longhand properties */
do {
prev_ctx = *ctx;
error = CSS_OK;
if (is_css_inherit(c, token)) {
/* Can't have another inherit */
error = CSS_INVALID;
goto css__parse_columns_cleanup;
}
/* Try each property parser in turn, but only if we
* haven't already got a value for this property.
*/
if ((width) &&
(error = css__parse_column_width(c, vector, ctx,
width_style)) == CSS_OK) {
width = false;
} else if ((count) &&
(error = css__parse_column_count(c, vector, ctx,
count_style)) == CSS_OK) {
count = 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 (width) {
error = css__stylesheet_style_appendOPV(width_style,
CSS_PROP_COLUMN_WIDTH, 0,
COLUMN_WIDTH_AUTO);
if (error != CSS_OK)
goto css__parse_columns_cleanup;
}
if (count) {
error = css__stylesheet_style_appendOPV(count_style,
CSS_PROP_COLUMN_COUNT, 0,
COLUMN_COUNT_AUTO);
if (error != CSS_OK)
goto css__parse_columns_cleanup;
}
/* Merge styles into the result */
error = css__stylesheet_merge_style(result, width_style);
if (error != CSS_OK)
goto css__parse_columns_cleanup;
error = css__stylesheet_merge_style(result, count_style);
css__parse_columns_cleanup:
css__stylesheet_style_destroy(width_style);
css__stylesheet_style_destroy(count_style);
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}