/*
 * 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 list-style-image
 *
 * \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 parse_list_style_image(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		css_style **result)
{
	int orig_ctx = *ctx;
	css_error error;
	const css_token *token;
	uint8_t flags = 0;
	uint16_t value = 0;
	uint32_t opv;
	uint32_t required_size;
	bool match;
	lwc_string *uri = NULL;

	/* URI | IDENT (none, inherit) */
	token = parserutils_vector_iterate(vector, ctx);
	if (token == NULL || (token->type != CSS_TOKEN_IDENT &&
			token->type != CSS_TOKEN_URI)) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->type == CSS_TOKEN_IDENT && 
			(lwc_string_caseless_isequal(
			token->idata, c->strings[INHERIT],
			&match) == lwc_error_ok && match)) {
		flags |= FLAG_INHERIT;
	} else if (token->type == CSS_TOKEN_IDENT && 
			(lwc_string_caseless_isequal(
			token->idata, c->strings[NONE],
			&match) == lwc_error_ok && match)) {
		value = LIST_STYLE_IMAGE_NONE;
	} else if (token->type == CSS_TOKEN_URI) {
		value = LIST_STYLE_IMAGE_URI;

		error = c->sheet->resolve(c->sheet->resolve_pw,
				c->sheet->url,
				token->idata, &uri);
		if (error != CSS_OK) {
			*ctx = orig_ctx;
			return error;
		}
	} else {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	opv = buildOPV(CSS_PROP_LIST_STYLE_IMAGE, flags, value);

	required_size = sizeof(opv);
	if ((flags & FLAG_INHERIT) == false && value == LIST_STYLE_IMAGE_URI)
		required_size += sizeof(lwc_string *);

	/* Allocate result */
	error = css_stylesheet_style_create(c->sheet, required_size, result);
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		return error;
	}

	/* Copy the bytecode to it */
	memcpy((*result)->bytecode, &opv, sizeof(opv));
	if ((flags & FLAG_INHERIT) == false && value == LIST_STYLE_IMAGE_URI) {
		/* Don't ref URI -- we want to pass ownership to the bytecode */
		memcpy((uint8_t *) (*result)->bytecode + sizeof(opv),
				&uri, sizeof(lwc_string *));
	}

	return CSS_OK;
}