/*
 * This file is part of Hubbub.
 * Licensed under the MIT License,
 *                http://www.opensource.org/licenses/mit-license.php
 * Copyright 2008 Andrew Sidwell <takkaria@netsurf-browser.org>
 */

#include <assert.h>
#include <string.h>

#include "treebuilder/modes.h"
#include "treebuilder/internal.h"
#include "treebuilder/treebuilder.h"
#include "utils/utils.h"


/**
 * Clear the stack back to a table row context.
 *
 * \param treebuilder	The treebuilder instance
 */
static void table_clear_stack(hubbub_treebuilder *treebuilder)
{
	element_type cur_node = current_node(treebuilder);

	while (cur_node != TR && cur_node != HTML) {
		hubbub_ns ns;
		element_type type;
		void *node;

		element_stack_pop(treebuilder, &ns, &type, &node);

		treebuilder->tree_handler->unref_node(
				treebuilder->tree_handler->ctx,
				node);

		cur_node = current_node(treebuilder);
	}

	return;
}


/**
 * Handle </tr> and anything that acts "as if" </tr> was emitted.
 *
 * \param treebuilder	The treebuilder instance
 * \return True to reprocess the token, false otherwise
 */
static hubbub_error act_as_if_end_tag_tr(hubbub_treebuilder *treebuilder)
{
	hubbub_ns ns;
	element_type otype;
	void *node;

	/** \todo fragment case */

	table_clear_stack(treebuilder);

	element_stack_pop(treebuilder, &ns, &otype, &node);

	treebuilder->tree_handler->unref_node(treebuilder->tree_handler->ctx,
			node);

	treebuilder->context.mode = IN_TABLE_BODY;

	return HUBBUB_REPROCESS;
}


/**
 * Handle tokens in "in row" insertion mode
 *
 * \param treebuilder  The treebuilder instance
 * \param token        The token to process
 * \return True to reprocess the token, false otherwise
 */
hubbub_error handle_in_row(hubbub_treebuilder *treebuilder,
		const hubbub_token *token)
{
	hubbub_error err = HUBBUB_OK;

	switch (token->type) {
	case HUBBUB_TOKEN_START_TAG:
	{
		element_type type = element_type_from_name(treebuilder,
				&token->data.tag.name);

		if (type == TH || type == TD) {
			table_clear_stack(treebuilder);

			err = insert_element(treebuilder, &token->data.tag, 
					true);
			if (err != HUBBUB_OK)
				return err;

			treebuilder->context.mode = IN_CELL;

			/* ref node for formatting list */
			treebuilder->tree_handler->ref_node(
				treebuilder->tree_handler->ctx, 
				treebuilder->context.element_stack[
				treebuilder->context.current_node].node);

			err = formatting_list_append(treebuilder, 
					token->data.tag.ns, type,
					treebuilder->context.element_stack[
					treebuilder->context.current_node].node,
					treebuilder->context.current_node);
			if (err != HUBBUB_OK) {
				hubbub_ns ns;
				element_type type;
				void *node;

				/* Revert changes */

				remove_node_from_dom(treebuilder, 
					treebuilder->context.element_stack[
					treebuilder->context.current_node].node);
				element_stack_pop(treebuilder, &ns, &type, 
						&node);

				return err;
			}
		} else if (type == CAPTION || type == COL ||
				type == COLGROUP || type == TBODY ||
				type == TFOOT || type == THEAD || type == TR) {
			err = act_as_if_end_tag_tr(treebuilder);
		} else {
			err = handle_in_table(treebuilder, token);
		}
	}
		break;
	case HUBBUB_TOKEN_END_TAG:
	{
		element_type type = element_type_from_name(treebuilder,
				&token->data.tag.name);

		if (type == TR) {
			/* We're done with this token, but act_as_if_end_tag_tr 
			 * will return HUBBUB_REPROCESS. Therefore, ignore the 
			 * return value. */
			(void) act_as_if_end_tag_tr(treebuilder);
		} else if (type == TABLE) {
			err = act_as_if_end_tag_tr(treebuilder);
		} else if (type == BODY || type == CAPTION || type == COL ||
				type == COLGROUP || type == HTML ||
				type == TD || type == TH) {
			/** \todo parse error */
			/* Ignore the token */
		} else {
			err = handle_in_table(treebuilder, token);
		}
	}
		break;
	case HUBBUB_TOKEN_CHARACTER:
	case HUBBUB_TOKEN_COMMENT:
	case HUBBUB_TOKEN_DOCTYPE:
	case HUBBUB_TOKEN_EOF:
		err = handle_in_table(treebuilder, token);
		break;
	}

	return err;
}