/*
 * 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 text-decoration
 *
 * \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_text_decoration(css_language *c,
		const parserutils_vector *vector, int *ctx,
		css_style *result)
{
	int orig_ctx = *ctx;
	css_error error = CSS_INVALID;
	const css_token *token;
	bool match;

	/* IDENT([ underline || overline || line-through || blink ])
	 * | IDENT (none, inherit) */
	token = parserutils_vector_iterate(vector, ctx);
	if ((token == NULL) || (token->type != CSS_TOKEN_IDENT) ) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (lwc_string_caseless_isequal(token->idata,
			c->strings[INHERIT],
			&match) == lwc_error_ok && match) {
		error = css_stylesheet_style_inherit(result, CSS_PROP_TEXT_DECORATION);
	} else if (lwc_string_caseless_isequal(token->idata,
				c->strings[NONE],
				&match) == lwc_error_ok && match) {
		error = css__stylesheet_style_appendOPV(result,
				CSS_PROP_TEXT_DECORATION, 0, TEXT_DECORATION_NONE);
	} else {
		uint16_t value = 0;
		while (token != NULL) {
			if ((lwc_string_caseless_isequal(
					token->idata, c->strings[UNDERLINE],
					&match) == lwc_error_ok && match)) {
				if ((value & TEXT_DECORATION_UNDERLINE) == 0)
					value |= TEXT_DECORATION_UNDERLINE;
				else {
					*ctx = orig_ctx;
					return CSS_INVALID;
				}
			} else if ((lwc_string_caseless_isequal(
					token->idata, c->strings[OVERLINE],
					&match) == lwc_error_ok && match)) {
				if ((value & TEXT_DECORATION_OVERLINE) == 0)
					value |= TEXT_DECORATION_OVERLINE;
				else {
					*ctx = orig_ctx;
					return CSS_INVALID;
				}
			} else if ((lwc_string_caseless_isequal(
					token->idata, c->strings[LINE_THROUGH],
					&match) == lwc_error_ok && match)) {
				if ((value & TEXT_DECORATION_LINE_THROUGH) == 0)
					value |= TEXT_DECORATION_LINE_THROUGH;
				else {
					*ctx = orig_ctx;
					return CSS_INVALID;
				}
			} else if ((lwc_string_caseless_isequal(
					token->idata, c->strings[BLINK],
					&match) == lwc_error_ok && match)) {
				if ((value & TEXT_DECORATION_BLINK) == 0)
					value |= TEXT_DECORATION_BLINK;
				else {
					*ctx = orig_ctx;
					return CSS_INVALID;
				}
			} else {
				*ctx = orig_ctx;
				return CSS_INVALID;
			}

			consumeWhitespace(vector, ctx);

			token = parserutils_vector_peek(vector, *ctx);
			if (token != NULL && token->type != CSS_TOKEN_IDENT)
				break;
			token = parserutils_vector_iterate(vector, ctx);
		}
		error = css__stylesheet_style_appendOPV(result,
				CSS_PROP_TEXT_DECORATION, 0, value);
	}

	if (error != CSS_OK)
		*ctx = orig_ctx;

	return error;
}