geany/src/symbols.c

/*
 *      symbols.c - this file is part of Geany, a fast and lightweight IDE
 *
 *      Copyright 2006-2008 Enrico Tröger <enrico(dot)troeger(at)uvena(dot)de>
 *      Copyright 2006-2008 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)com>
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Id$
 */

/*
 * Symbol Tree and TagManager-related convenience functions.
 * TagManager parses tags for each document, and also adds them to the workspace (session).
 * Global tags are lists of tags for each filetype, loaded when a document with a
 * matching filetype is first loaded.
 */

#include "SciLexer.h"
#include "geany.h"

#include <ctype.h>
#include <string.h>
#include <stdlib.h>

#include "prefix.h"
#include "symbols.h"
#include "utils.h"
#include "filetypes.h"
#include "encodings.h"
#include "document.h"
#include "documentprivate.h"
#include "support.h"
#include "msgwindow.h"
#include "treeviews.h"
#include "main.h"
#include "navqueue.h"
#include "ui_utils.h"
#include "editor.h"
#include "sciwrappers.h"


const guint TM_GLOBAL_TYPE_MASK =
	tm_tag_class_t | tm_tag_enum_t | tm_tag_interface_t |
	tm_tag_struct_t | tm_tag_typedef_t | tm_tag_union_t;


static gchar **html_entities = NULL;

typedef struct
{
	gboolean	tags_loaded;
	const gchar	*tag_file;
} TagFileInfo;

/* Check before adding any more tags files, usually they should be downloaded separately. */
enum	/* Geany tag files */
{
	GTF_C,
	GTF_PASCAL,
	GTF_PHP,
	GTF_HTML_ENTITIES,
	GTF_LATEX,
	GTF_PYTHON,
	GTF_MAX
};

static TagFileInfo tag_file_info[GTF_MAX] =
{
	{FALSE, "global.tags"},
	{FALSE, "pascal.tags"},
	{FALSE, "php.tags"},
	{FALSE, "html_entities.tags"},
	{FALSE, "latex.tags"},
	{FALSE, "python.tags"}
};

static gchar *user_tags_dir;

static GPtrArray *top_level_iter_names = NULL;


static void html_tags_loaded(void);
static void load_user_tags(filetype_id ft_id);

/* get the tags_ignore list, exported by tagmanager's options.c */
extern gchar **c_tags_ignore;

static void load_c_ignore_tags(void)
{
	gchar *path = g_strconcat(app->configdir, G_DIR_SEPARATOR_S "ignore.tags", NULL);
	gchar *content;

	if (g_file_get_contents(path, &content, NULL, NULL))
	{
		c_tags_ignore = g_strsplit_set(content, " \n\r", -1);
		g_free(content);
	}
	g_free(path);
}


/* Ensure that the global tags file(s) for the file_type_idx filetype is loaded.
 * This provides autocompletion, calltips, etc. */
void symbols_global_tags_loaded(gint file_type_idx)
{
	TagFileInfo *tfi;
	gint tag_type;

	/* load ignore list for C/C++ parser */
	if ((file_type_idx == GEANY_FILETYPES_C || file_type_idx == GEANY_FILETYPES_CPP) &&
		c_tags_ignore == NULL)
	{
		load_c_ignore_tags();
	}

	if (cl_options.ignore_global_tags || app->tm_workspace == NULL)
		return;

	load_user_tags(file_type_idx);

	switch (file_type_idx)
	{
		case GEANY_FILETYPES_PHP:
		case GEANY_FILETYPES_HTML:
			html_tags_loaded();
	}
	switch (file_type_idx)
	{
		case GEANY_FILETYPES_CPP:
			symbols_global_tags_loaded(GEANY_FILETYPES_C);	/* load C global tags */
			/* no C++ tagfile yet */
			return;
		case GEANY_FILETYPES_C:		tag_type = GTF_C; break;
		case GEANY_FILETYPES_PASCAL:tag_type = GTF_PASCAL; break;
		case GEANY_FILETYPES_PHP:	tag_type = GTF_PHP; break;
		case GEANY_FILETYPES_LATEX:	tag_type = GTF_LATEX; break;
		case GEANY_FILETYPES_PYTHON:tag_type = GTF_PYTHON; break;
		default:
			return;
	}
	tfi = &tag_file_info[tag_type];

	if (! tfi->tags_loaded)
	{
		gchar *fname = g_strconcat(app->datadir, G_DIR_SEPARATOR_S, tfi->tag_file, NULL);
		gint tm_lang;

		tm_lang = filetypes[file_type_idx]->lang;
		tm_workspace_load_global_tags(fname, tm_lang);
		tfi->tags_loaded = TRUE;
		g_free(fname);
	}
}


/* HTML tagfile is just a list of entities for autocompletion (e.g. '&amp;') */
static void html_tags_loaded(void)
{
	TagFileInfo *tfi;

	if (cl_options.ignore_global_tags) return;

	tfi = &tag_file_info[GTF_HTML_ENTITIES];
	if (! tfi->tags_loaded)
	{
		gchar *file = g_strconcat(app->datadir, G_DIR_SEPARATOR_S, tfi->tag_file, NULL);

		html_entities = utils_read_file_in_array(file);
		tfi->tags_loaded = TRUE;
		g_free(file);
	}
}


GString *symbols_find_tags_as_string(GPtrArray *tags_array, guint tag_types, gint lang)
{
	guint j;
	TMTag *tag;
	GString *s = NULL;
	GPtrArray *typedefs;

	g_return_val_if_fail(tags_array != NULL, NULL);

	typedefs = tm_tags_extract(tags_array, tag_types);

	if ((typedefs) && (typedefs->len > 0))
	{
		s = g_string_sized_new(typedefs->len * 10);
		for (j = 0; j < typedefs->len; ++j)
		{
			tag = TM_TAG(typedefs->pdata[j]);
			if (!(tag->atts.entry.scope))
			{
				/* tag->atts.file.lang contains (for some reason) the line of the tag if
				 * tag->atts.entry.file is not NULL */
				gint tag_lang =
					(tag->atts.entry.file) ? tag->atts.entry.file->lang : tag->atts.file.lang;

				/* the check for tag_lang == lang is necessary to avoid wrong type colouring of
				 * e.g. PHP classes in C++ files
				 * lang = -2 disables the check */
				if (tag->name && (tag_lang == lang || lang == -2))
				{
					if (j != 0)
						g_string_append_c(s, ' ');
					g_string_append(s, tag->name);
				}
			}
		}
	}
	if (typedefs)
		g_ptr_array_free(typedefs, TRUE);
	return s;
}


const gchar *symbols_get_context_separator(gint ft_id)
{
	gchar *cosep;

	switch (ft_id)
	{
		case GEANY_FILETYPES_C:	/* for C++ .h headers or C structs */
		case GEANY_FILETYPES_CPP:
		case GEANY_FILETYPES_GLSL:	/* for structs */
		/*case GEANY_FILETYPES_RUBY:*/ /* not sure what to use atm*/
		{
			static gchar cc[] = "::";

			cosep = cc;
		}
		break;

		default:
		{
			static gchar def[] = ".";

			cosep = def;
		}
	}
	return cosep;	/* return ptr to static string */
}


GString *symbols_get_macro_list(void)
{
	guint j, i;
	GPtrArray *ftags;
	GString *words;

	if (app->tm_workspace->work_objects == NULL)
		return NULL;

	ftags = g_ptr_array_sized_new(50);
	words = g_string_sized_new(200);

	for (j = 0; j < app->tm_workspace->work_objects->len; j++)
	{
		GPtrArray *tags;

		tags = tm_tags_extract(TM_WORK_OBJECT(app->tm_workspace->work_objects->pdata[j])->tags_array,
			tm_tag_enum_t | tm_tag_variable_t | tm_tag_macro_t | tm_tag_macro_with_arg_t);
		if (NULL != tags)
		{
			for (i = 0; ((i < tags->len) && (i < editor_prefs.autocompletion_max_entries)); ++i)
			{
				g_ptr_array_add(ftags, (gpointer) tags->pdata[i]);
			}
			g_ptr_array_free(tags, TRUE);
		}
	}
	tm_tags_sort(ftags, NULL, FALSE);
	for (j = 0; j < ftags->len; j++)
	{
		if (j > 0) g_string_append_c(words, '\n');
		g_string_append(words, TM_TAG(ftags->pdata[j])->name);
	}
	g_ptr_array_free(ftags, TRUE);
	return words;
}


/* Note: if tags is sorted, we can use bsearch or tm_tags_find() to speed this up. */
static TMTag *
symbols_find_tm_tag(const GPtrArray *tags, const gchar *tag_name)
{
	guint i;
	g_return_val_if_fail(tags != NULL, NULL);

	for (i = 0; i < tags->len; ++i)
	{
		if (utils_str_equal(TM_TAG(tags->pdata[i])->name, tag_name))
			return TM_TAG(tags->pdata[i]);
	}
	return NULL;
}


static TMTag *find_work_object_tag(const TMWorkObject *workobj,
		const gchar *tag_name, gint type)
{
	GPtrArray *tags;
	TMTag *tmtag;

	if (workobj != NULL)
	{
		tags = tm_tags_extract(workobj->tags_array, type);
		if (tags != NULL)
		{
			tmtag = symbols_find_tm_tag(tags, tag_name);

			g_ptr_array_free(tags, TRUE);

			if (tmtag != NULL)
				return tmtag;
		}
	}
	return NULL;	/* not found */
}


static TMTag *find_workspace_tag(const gchar *tag_name, gint type)
{
	guint j;
	const GPtrArray *work_objects = NULL;

	if (app->tm_workspace != NULL)
		work_objects = app->tm_workspace->work_objects;

	if (work_objects != NULL)
	{
		for (j = 0; j < work_objects->len; j++)
		{
			TMWorkObject *workobj = TM_WORK_OBJECT(work_objects->pdata[j]);
			TMTag *tmtag;

			tmtag = find_work_object_tag(workobj, tag_name, type);
			if (tmtag != NULL)
				return tmtag;
		}
	}
	return NULL;	/* not found */
}


const gchar **symbols_get_html_entities(void)
{
	if (html_entities == NULL)
		html_tags_loaded(); /* if not yet created, force creation of the array but shouldn't occur */

	return (const gchar **) html_entities;
}


void symbols_finalize(void)
{
	g_strfreev(html_entities);
	g_strfreev(c_tags_ignore);
}


/* sort by name, then line */
static gint compare_symbol(const TMTag *tag_a, const TMTag *tag_b)
{
	gint ret;

	if (tag_a == NULL || tag_b == NULL)
		return 0;

	ret = strcmp(tag_a->name, tag_b->name);
	if (ret == 0)
	{
		return tag_a->atts.entry.line - tag_b->atts.entry.line;
	}
	return ret;
}


/* sort by line only */
static gint compare_symbol_lines(gconstpointer a, gconstpointer b)
{
	const TMTag *tag_a = TM_TAG(a);
	const TMTag *tag_b = TM_TAG(b);

	if (a == NULL || b == NULL)
		return 0;

	return tag_a->atts.entry.line - tag_b->atts.entry.line;
}


static GList *get_tag_list(GeanyDocument *doc, guint tag_types)
{
	GList *tag_names = NULL;
	TMTag *tag;
	guint i;

	g_return_val_if_fail(doc, NULL);

	if (!doc->tm_file || !doc->tm_file->tags_array)
		return NULL;

	for (i = 0; i < doc->tm_file->tags_array->len; ++i)
	{
		tag = TM_TAG(doc->tm_file->tags_array->pdata[i]);
		if (tag == NULL)
			return NULL;

		if (tag->type & tag_types)
		{
			tag_names = g_list_append(tag_names, tag);
		}
	}
	tag_names = g_list_sort(tag_names, compare_symbol_lines);
	return tag_names;
}


/* amount of types in the symbol list (currently max. 8 are used) */
#define MAX_SYMBOL_TYPES	(sizeof(tv_iters) / sizeof(GtkTreeIter))

struct TreeviewSymbols
{
	GtkTreeIter		 tag_function;
	GtkTreeIter		 tag_class;
	GtkTreeIter		 tag_macro;
	GtkTreeIter		 tag_member;
	GtkTreeIter		 tag_variable;
	GtkTreeIter		 tag_namespace;
	GtkTreeIter		 tag_struct;
	GtkTreeIter		 tag_type;
	GtkTreeIter		 tag_other;
} tv_iters;


static void init_tag_iters(void)
{
	/* init all GtkTreeIters with -1 to make them invalid to avoid crashes when switching between
	 * filetypes(e.g. config file to Python crashes Geany without this) */
	tv_iters.tag_function.stamp = -1;
	tv_iters.tag_class.stamp = -1;
	tv_iters.tag_member.stamp = -1;
	tv_iters.tag_macro.stamp = -1;
	tv_iters.tag_variable.stamp = -1;
	tv_iters.tag_namespace.stamp = -1;
	tv_iters.tag_struct.stamp = -1;
	tv_iters.tag_type.stamp = -1;
	tv_iters.tag_other.stamp = -1;
}


static GdkPixbuf *get_tag_icon(const gchar *icon_name)
{
	static GtkIconTheme *icon_theme = NULL;
	static gint x, y;

	if (icon_theme == NULL)
	{
#ifndef G_OS_WIN32
		gchar *path = g_strconcat(GEANY_DATADIR, "/icons", NULL);
#endif
		gtk_icon_size_lookup(GTK_ICON_SIZE_MENU, &x, &y);
		icon_theme = gtk_icon_theme_get_default();
#ifdef G_OS_WIN32
		gtk_icon_theme_append_search_path(icon_theme, "share\\icons");
#else
		gtk_icon_theme_append_search_path(icon_theme, path);
		g_free(path);
#endif
	}
	return gtk_icon_theme_load_icon(icon_theme, icon_name, x, 0, NULL);
}


/* Adds symbol list groups in (iter*, title) pairs.
 * The list must be ended with NULL. */
static void G_GNUC_NULL_TERMINATED
tag_list_add_groups(GtkTreeStore *tree_store, ...)
{
	va_list args;
	GtkTreeIter *iter;

	g_return_if_fail(top_level_iter_names);

    va_start(args, tree_store);
    for (; iter = va_arg(args, GtkTreeIter*), iter != NULL;)
    {
		gchar *title = va_arg(args, gchar*);
		gchar *icon_name = va_arg(args, gchar *);
		GdkPixbuf *icon = NULL;

		if (icon_name)
		{
			icon = get_tag_icon(icon_name);
		}

    	g_assert(title != NULL);
		g_ptr_array_add(top_level_iter_names, title);

		gtk_tree_store_append(tree_store, iter, NULL);

		if (G_IS_OBJECT(icon))
		{
			gtk_tree_store_set(tree_store, iter, SYMBOLS_COLUMN_ICON, icon, -1);
			g_object_unref(icon);
		}
		gtk_tree_store_set(tree_store, iter, SYMBOLS_COLUMN_NAME, title, -1);
	}
	va_end(args);
}


static void add_top_level_items(GeanyDocument *doc)
{
	filetype_id ft_id = doc->file_type->id;
	GtkTreeStore *tag_store = doc->priv->tag_store;

	if (top_level_iter_names == NULL)
		top_level_iter_names = g_ptr_array_new();
	else
		g_ptr_array_set_size(top_level_iter_names, 0);

	init_tag_iters();

	switch (ft_id)
	{
		case GEANY_FILETYPES_DIFF:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Files"), NULL, NULL);
			break;
		}
		case GEANY_FILETYPES_DOCBOOK:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Chapter"), NULL,
				&(tv_iters.tag_class), _("Section"), NULL,
				&(tv_iters.tag_member), _("Sect1"), NULL,
				&(tv_iters.tag_macro), _("Sect2"), NULL,
				&(tv_iters.tag_variable), _("Sect3"), NULL,
				&(tv_iters.tag_struct), _("Appendix"), NULL,
				&(tv_iters.tag_other), _("Other"), NULL,
				NULL);
			/*	&(tv_iters.tag_namespace), _("Other"), NULL, NULL);	*/
			break;
		}
		case GEANY_FILETYPES_HASKELL:
			tag_list_add_groups(tag_store,
				&tv_iters.tag_namespace, _("Module"), NULL,
				&tv_iters.tag_struct, _("Types"), NULL,
				&tv_iters.tag_macro, _("Type constructors"), NULL,
				&tv_iters.tag_function, _("Functions"), "classviewer-method",
				NULL);
			break;
		case GEANY_FILETYPES_CONF:
			tag_list_add_groups(tag_store,
				&tv_iters.tag_namespace, _("Sections"), NULL,
				&tv_iters.tag_macro, _("Keys"), NULL,
				NULL);
			break;
		case GEANY_FILETYPES_LATEX:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Command"), NULL,
				&(tv_iters.tag_class), _("Environment"), NULL,
				&(tv_iters.tag_member), _("Section"), NULL,
				&(tv_iters.tag_macro), _("Subsection"), NULL,
				&(tv_iters.tag_variable), _("Subsubsection"), NULL,
				&(tv_iters.tag_struct), _("Label"), NULL,
				&(tv_iters.tag_namespace), _("Chapter"), NULL,
				&(tv_iters.tag_other), _("Other"), NULL,
				NULL);
			break;
		}
		case GEANY_FILETYPES_MATLAB:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_struct), _("Structures"), "classviewer-struct",
				NULL);
			break;
		}
		case GEANY_FILETYPES_PERL:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_class), _("Package"), NULL,
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_member), _("My"), NULL,
				&(tv_iters.tag_macro), _("Local"), NULL,
				&(tv_iters.tag_variable), _("Our"), NULL,
				NULL);
				/*&(tv_iters.tag_struct), _("Label"), NULL,*/
				/*&(tv_iters.tag_namespace), _("Begin"), NULL,*/
				/*&(tv_iters.tag_other), _("Other"), NULL, NULL);*/
			break;
		}
		case GEANY_FILETYPES_PHP:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_struct), _("Interfaces"), "classviewer-struct",
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_macro), _("Constants"), "classviewer-macro",
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				NULL);
				/*&(tv_iters.tag_struct), _("Label"),*/
				/*&(tv_iters.tag_namespace), _("Begin"),*/
				/*&(tv_iters.tag_other), _("Other"), NULL);*/
			break;
		}
		case GEANY_FILETYPES_HTML:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("JavaScript functions"), NULL,
				&(tv_iters.tag_member), _("Anchor"), NULL,
				&(tv_iters.tag_namespace), _("Heading (H1)"), NULL,
				&(tv_iters.tag_class), _("Heading (H2)"), NULL,
				&(tv_iters.tag_variable), _("Heading (H3)"), NULL,
				NULL);
			break;
		}
		case GEANY_FILETYPES_CSS:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_variable), _("ID Selectors"), "classviewer-var",
				&(tv_iters.tag_struct), _("Type Selectors"), "classviewer-struct", NULL);
			break;
		}
		case GEANY_FILETYPES_REST:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_namespace), _("Chapter"), NULL,
				&(tv_iters.tag_member), _("Section"), NULL,
				&(tv_iters.tag_macro), _("Subsection"), NULL,
				&(tv_iters.tag_variable), _("Subsubsection"), NULL,
				NULL);
			break;
		}
		case GEANY_FILETYPES_RUBY:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_namespace), _("Modules"), NULL,
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_member), _("Singletons"), "classviewer-struct",
				&(tv_iters.tag_function), _("Methods"), "classviewer-method",
				NULL);
				/*&(tv_iters.tag_namespace), _("Begin"),*/
				/*&(tv_iters.tag_other), _("Other"), NULL);*/
			break;
		}
		case GEANY_FILETYPES_TCL:
		case GEANY_FILETYPES_PYTHON:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_member), _("Methods"), "classviewer-member",
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				NULL);
				/*&(tv_iters.tag_macro), _("Mixin"),*/
				/*&(tv_iters.tag_variable), _("Variables"),*/
				/*&(tv_iters.tag_struct), _("Members"),*/
				/*&(tv_iters.tag_namespace), _("Begin"),*/
				/*&(tv_iters.tag_other), _("Other"), NULL);*/
			break;
		}
		case GEANY_FILETYPES_VHDL:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				/*&(tv_iters.tag_class), _("Constants"),*/
				/*&(tv_iters.tag_member), _("Members"),*/
				/*&(tv_iters.tag_macro), _("Macros"),*/
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				NULL);
				/*&(tv_iters.tag_namespace), _("Namespaces"),*/
				/*&(tv_iters.tag_struct), _("Signals"),*/
				/*&(tv_iters.tag_other), _("Other"), NULL);*/
			break;
		}
		case GEANY_FILETYPES_JAVA:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_namespace), _("Package"), NULL,
				&(tv_iters.tag_struct), _("Interfaces"), "classviewer-struct",
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_function), _("Methods"), "classviewer-method",
				&(tv_iters.tag_member), _("Members"), "classviewer-member",
				/*&(tv_iters.tag_macro), _("Macros"),*/
				/*&(tv_iters.tag_variable), _("Variables"),*/
				&(tv_iters.tag_other), _("Other"), "classviewer-other",
				NULL);
			break;
		}
		case GEANY_FILETYPES_HAXE:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_struct), _("Interfaces"), "classviewer-struct",
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_function), _("Methods"), "classviewer-method",
				&(tv_iters.tag_type), _("Types"), "classviewer-macro",
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				&(tv_iters.tag_other), _("Other"), "classviewer-other",
				NULL);
			break;
		}
		case GEANY_FILETYPES_BASIC:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				&(tv_iters.tag_macro), _("Constants"), "classviewer-macro",
				&(tv_iters.tag_struct), _("Types"), "classviewer-namespace",
				&(tv_iters.tag_namespace), _("Labels"), "classviewer-member",
				&(tv_iters.tag_other), _("Other"), "classviewer-other",
				NULL);
			break;
		}
		case GEANY_FILETYPES_F77:
		case GEANY_FILETYPES_FORTRAN:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_namespace), _("Module"), "classviewer-class",
				&(tv_iters.tag_struct), _("Interfaces"), "classviewer-struct",
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_member), _("Subroutines"), "classviewer-method",
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				&(tv_iters.tag_type), _("Types"), "classviewer-namespace",
				&(tv_iters.tag_macro), _("Blocks"), "classviewer-member",
				&(tv_iters.tag_other), _("Other"), "classviewer-other",
				NULL);
			break;
		}
		case GEANY_FILETYPES_ASM:
		{
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_namespace), _("Labels"), "classviewer-namespace",
				&(tv_iters.tag_function), _("Macros"), "classviewer-method",
				&(tv_iters.tag_macro), _("Defines"), "classviewer-macro",
				&(tv_iters.tag_struct), _("Types"), "classviewer-struct",
				NULL);
			break;
		}
		case GEANY_FILETYPES_MAKE:
			tag_list_add_groups(tag_store,
				&tv_iters.tag_function, _("Targets"), "classviewer-method",
				&tv_iters.tag_macro, _("Macros"), "classviewer-macro",
				NULL);
			break;
		case GEANY_FILETYPES_D:
		default:
		{
			if (ft_id == GEANY_FILETYPES_D)
				tag_list_add_groups(tag_store,
					&(tv_iters.tag_namespace), _("Module"), NULL, NULL);
			else
				tag_list_add_groups(tag_store,
					&(tv_iters.tag_namespace), _("Namespaces"), "classviewer-namespace", NULL);

			tag_list_add_groups(tag_store,
				&(tv_iters.tag_class), _("Classes"), "classviewer-class",
				&(tv_iters.tag_function), _("Functions"), "classviewer-method",
				&(tv_iters.tag_member), _("Members"), "classviewer-member",
				&(tv_iters.tag_struct), _("Structs / Typedefs"), "classviewer-struct",
				NULL);

			if (ft_id != GEANY_FILETYPES_D)
			{
				tag_list_add_groups(tag_store,
					&(tv_iters.tag_macro), _("Macros"), "classviewer-macro", NULL);
			}
			tag_list_add_groups(tag_store,
				&(tv_iters.tag_variable), _("Variables"), "classviewer-var",
				&(tv_iters.tag_other), _("Other"), "classviewer-other", NULL);
		}
	}
}


/* the following code surely can be improved, at the moment it collects some iters
 * for removal and after that the actual removal is done. I didn't find a way to find and remove
 * an empty row in one loop (next iter fails then) */
static void hide_empty_rows(GtkTreeStore *store)
{
	GtkTreeIter iter, *iters[MAX_SYMBOL_TYPES] = { NULL };
	guint i = 0;

	if (! gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter))
		return; /* stop when first iter is invalid, i.e. no elements */

	do /* first collect the iters we need to delete empty rows */
	{
		if (! gtk_tree_model_iter_has_child(GTK_TREE_MODEL(store), &iter))
			iters[i++] = gtk_tree_iter_copy(&iter);
	} while (gtk_tree_model_iter_next(GTK_TREE_MODEL(store), &iter));

	/* now actually delete the collected iters */
	for (i = 0; i < MAX_SYMBOL_TYPES; i++)
	{
		if (iters[i] == NULL)
			break;
		gtk_tree_store_remove(store, iters[i]);
		gtk_tree_iter_free(iters[i]);
	}
}


static const gchar *get_symbol_name(GeanyDocument *doc, const TMTag *tag,
		gboolean found_parent)
{
	gchar *utf8_name;
	const gchar *scope = tag->atts.entry.scope;
	static GString *buffer = NULL;	/* buffer will be small so we can keep it for reuse */
	gboolean doc_is_utf8 = FALSE;

	/* encodings_convert_to_utf8_from_charset() fails with charset "None", so skip conversion
	 * for None at this point completely */
	if (utils_str_equal(doc->encoding, "UTF-8") ||
		utils_str_equal(doc->encoding, "None"))
		doc_is_utf8 = TRUE;

	if (! doc_is_utf8)
		utf8_name = encodings_convert_to_utf8_from_charset(tag->name,
			(gsize)-1, doc->encoding, TRUE);
	else
		utf8_name = tag->name;

	if (utf8_name == NULL)
		return NULL;

	if (!buffer)
		buffer = g_string_new(NULL);
	else
		g_string_truncate(buffer, 0);

	/* check first char of scope is a wordchar */
	if (!found_parent && scope &&
		strpbrk(scope, GEANY_WORDCHARS) == scope)
	{
		const gchar *sep = symbols_get_context_separator(FILETYPE_ID(doc->file_type));

		g_string_append(buffer, scope);
		g_string_append(buffer, sep);
	}
	g_string_append(buffer, utf8_name);

	if (! doc_is_utf8)
		g_free(utf8_name);

	g_string_append_printf(buffer, " [%lu]", tag->atts.entry.line);

	return buffer->str;
}


/* find the last word in "foo::bar::blah", e.g. "blah" */
const gchar *get_parent_name(const TMTag *tag, filetype_id ft_id)
{
	const gchar *scope = tag->atts.entry.scope;
	const gchar *separator = symbols_get_context_separator(ft_id);
	const gchar *str, *ptr;

	if (!scope)
		return NULL;

	str = scope;

	while (1)
	{
		ptr = strstr(str, separator);
		if (ptr)
		{
			str = ptr + strlen(separator);
		}
		else
			break;
	}

	return NZV(str) ? str : NULL;
}


static GtkTreeIter *get_tag_type_iter(TMTagType tag_type, filetype_id ft_id)
{
	GtkTreeIter *iter = NULL;

	switch (tag_type)
	{
		case tm_tag_prototype_t:
		case tm_tag_method_t:
		case tm_tag_function_t:
		{
			iter = &tv_iters.tag_function;
			break;
		}
		case tm_tag_macro_t:
		case tm_tag_macro_with_arg_t:
		{
			iter = &tv_iters.tag_macro;
			break;
		}
		case tm_tag_class_t:
		{
			iter = &tv_iters.tag_class;
			break;
		}
		case tm_tag_member_t:
		case tm_tag_field_t:
		{
			iter = &tv_iters.tag_member;
			break;
		}
		case tm_tag_typedef_t:
		case tm_tag_enum_t:
		{
			/* TODO separate C-like types here also */
			if (ft_id == GEANY_FILETYPES_HAXE)
			{
				iter = &tv_iters.tag_type;
				break;
			}
			/* fall through */
		}
		case tm_tag_union_t:
		case tm_tag_struct_t:
		case tm_tag_interface_t:
		{
			iter = &tv_iters.tag_struct;
			break;
		}
		case tm_tag_variable_t:
		{
			iter = &tv_iters.tag_variable;
			break;
		}
		case tm_tag_namespace_t:
		case tm_tag_package_t:
		{
			iter = &tv_iters.tag_namespace;
			break;
		}
		default:
		{
			iter = &tv_iters.tag_other;
		}
	}
	if (iter->stamp != -1)
		return iter;
	else
		return NULL;
}


static void add_tree_tag(GeanyDocument *doc, const TMTag *tag, GHashTable *parent_hash)
{
	filetype_id ft_id = FILETYPE_ID(doc->file_type);
	GtkTreeStore *tree_store = doc->priv->tag_store;
	GtkTreeIter *parent = NULL;

	parent = get_tag_type_iter(tag->type, ft_id);

	if (parent)
	{
		const gchar *name;
		const gchar *parent_name = get_parent_name(tag, ft_id);
		GtkTreeIter iter;
		GtkTreeIter *icon_iter = NULL, *child = NULL;
		GdkPixbuf *icon = NULL;

		child = &iter;
		icon_iter = (parent != &tv_iters.tag_other) ? parent : &tv_iters.tag_variable;

		gtk_tree_model_get(GTK_TREE_MODEL(tree_store), icon_iter,
			SYMBOLS_COLUMN_ICON, &icon, -1);

		if (parent_name)
		{
			GtkTreeIter *parent_search =
				(GtkTreeIter *)g_hash_table_lookup(parent_hash, parent_name);

			if (parent_search)
				parent = parent_search;
			else
				parent_name = NULL;
		}

		/* check if the current tag is a parent of other tags */
		if (g_hash_table_lookup_extended(parent_hash, tag->name, NULL, NULL) &&
			!utils_str_equal(tag->name, parent_name))	/* prevent Foo::Foo from making parent = child */
		{
			GtkTreeIter *new_iter = g_new0(GtkTreeIter, 1);

			/* set an iter value for the hash key */
			g_hash_table_insert(parent_hash, tag->name, new_iter);
			/* instead of ignoring the appended child iter below, use the one in the hash table */
			child = new_iter;
		}

		gtk_tree_store_append(tree_store, child, parent);

		name = get_symbol_name(doc, tag, (parent_name != NULL));
		gtk_tree_store_set(tree_store, child,
			SYMBOLS_COLUMN_ICON, icon,
			SYMBOLS_COLUMN_NAME, name,
			SYMBOLS_COLUMN_TAG, tag, -1);

		if (G_LIKELY(G_IS_OBJECT(icon)))
			g_object_unref(icon);
	}
	else
		geany_debug("Missing symbol-tree parent iter for type %d!", tag->type);
}


static void add_tree_tags(GeanyDocument *doc, const GList *tags)
{
	const GList *item;
	GHashTable *parent_hash;

	/* Create a hash table "parent_tag_name":(GtkTreeIter*) */
	parent_hash = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);

	/* find and store all parent names in the hash table */
	for (item = tags; item; item = g_list_next(item))
	{
		const TMTag *tag = item->data;
		const gchar *name = get_parent_name(tag, FILETYPE_ID(doc->file_type));

		if (name)
			g_hash_table_insert(parent_hash, (gpointer)name, NULL);
	}
	for (item = tags; item; item = g_list_next(item))
	{
		const TMTag *tag = item->data;

		add_tree_tag(doc, tag, parent_hash);
	}
	g_hash_table_destroy(parent_hash);
}


/* @param item Must be a (gpointer*) for implementation reasons.
 * @example gchar *name = *item; (for when the GPtrArray contains char pointers). */
#define foreach_ptr_array(item, ptr_array) \
	for (item = ptr_array->pdata; item < &ptr_array->pdata[ptr_array->len]; item++)

/* we don't want to sort 1st-level nodes, but we can't return 0 because the tree sort
 * is not stable, so the order is already lost. */
static gint compare_top_level_names(const gchar *a, const gchar *b)
{
	gpointer *item;

	foreach_ptr_array(item, top_level_iter_names)
	{
		const gchar *name = *item;

		if (utils_str_equal(name, a))
			return -1;
		if (utils_str_equal(name, b))
			return 1;
	}
	g_warning("Couldn't find top level node '%s' or '%s'!", a, b);
	return 0;
}


static gboolean tag_has_missing_parent(const TMTag *tag, GtkTreeStore *store,
		GtkTreeIter *iter)
{
	/* if the tag has a parent tag, it should be at depth >= 2 */
	return NZV(tag->atts.entry.scope) &&
		gtk_tree_store_iter_depth(store, iter) == 1;
}


static gint tree_sort_func(GtkTreeModel *model, GtkTreeIter *a, GtkTreeIter *b,
		gpointer user_data)
{
	gboolean sort_by_name = GPOINTER_TO_INT(user_data);
	const TMTag *tag_a, *tag_b;

	gtk_tree_model_get(model, a, SYMBOLS_COLUMN_TAG, &tag_a, -1);
	gtk_tree_model_get(model, b, SYMBOLS_COLUMN_TAG, &tag_b, -1);

	/* Check if the iters can be sorted based on tag name and line, not tree item name.
	 * Sort by tree name if the scope was prepended, e.g. 'ScopeNameWithNoTag::TagName'. */
	if (tag_a && !tag_has_missing_parent(tag_a, GTK_TREE_STORE(model), a) &&
		tag_b && !tag_has_missing_parent(tag_b, GTK_TREE_STORE(model), b))
	{
		return sort_by_name ? compare_symbol(tag_a, tag_b) :
			compare_symbol_lines(tag_a, tag_b);
	}
	else
	{
		gchar *astr, *bstr;
		gint cmp;

		gtk_tree_model_get(model, a, SYMBOLS_COLUMN_NAME, &astr, -1);
		gtk_tree_model_get(model, b, SYMBOLS_COLUMN_NAME, &bstr, -1);

		/* if a is toplevel, b must be also */
		if (gtk_tree_store_iter_depth(GTK_TREE_STORE(model), a) == 0)
		{
			cmp = compare_top_level_names(astr, bstr);
		}
		else
		{
			cmp = strcmp(astr, bstr);

			/* sort duplicate 'ScopeName::OverloadedTagName' items by line as well */
			if (tag_a && tag_b)
				if (!sort_by_name ||
					(utils_str_equal(tag_a->name, tag_b->name) &&
						utils_str_equal(tag_a->atts.entry.scope, tag_b->atts.entry.scope)))
					cmp = compare_symbol_lines(tag_a, tag_b);
		}
		g_free(astr);
		g_free(bstr);
		return cmp;
	}
}


static void sort_tree(GtkTreeStore *store, gboolean sort_by_name)
{
	gtk_tree_sortable_set_sort_func(GTK_TREE_SORTABLE(store), 1, tree_sort_func,
		GINT_TO_POINTER(sort_by_name), NULL);

	gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(store), 1, GTK_SORT_ASCENDING);
}


gboolean symbols_recreate_tag_list(GeanyDocument *doc, gint sort_mode)
{
	GList *tags;
	static gint prev_sort_mode = SYMBOLS_SORT_BY_NAME;

	g_return_val_if_fail(doc != NULL, FALSE);

	tags = get_tag_list(doc, tm_tag_max_t);
	if (tags == NULL)
		return FALSE;

	/* Make sure the model stays with us after the tree view unrefs it */
	g_object_ref(GTK_TREE_MODEL(doc->priv->tag_store));
	/* Detach model from view */
	gtk_tree_view_set_model(GTK_TREE_VIEW(doc->priv->tag_tree), NULL);
	/* Clear all contents */
	gtk_tree_store_clear(doc->priv->tag_store);

	/* add grandparent type iters */
	add_top_level_items(doc);

	add_tree_tags(doc, tags);
	g_list_free(tags);

	hide_empty_rows(doc->priv->tag_store);

	if (sort_mode == SYMBOLS_SORT_USE_PREVIOUS)
		sort_mode = prev_sort_mode;
	else
		prev_sort_mode = sort_mode;

	sort_tree(doc->priv->tag_store, sort_mode == SYMBOLS_SORT_BY_NAME);

	/* Re-attach model to view */
	gtk_tree_view_set_model(GTK_TREE_VIEW(doc->priv->tag_tree),
		GTK_TREE_MODEL(doc->priv->tag_store));
	g_object_unref(GTK_TREE_MODEL(doc->priv->tag_store));
	gtk_tree_view_expand_all(GTK_TREE_VIEW(doc->priv->tag_tree));

	return TRUE;
}


/* Detects a global tags filetype from the *.lang.* language extension.
 * Returns NULL if there was no matching TM language. */
static GeanyFiletype *detect_global_tags_filetype(const gchar *utf8_filename)
{
	gchar *tags_ext;
	gchar *shortname = g_strdup(utf8_filename);
	GeanyFiletype *ft = NULL;

	tags_ext = strstr(shortname, ".tags");
	if (tags_ext)
	{
		*tags_ext = '\0';	/* remove .tags extension */
		ft = filetypes_detect_from_extension(shortname);
	}
	g_free(shortname);

	if (ft == NULL || ! filetype_has_tags(ft))
		return NULL;
	return ft;
}


/* Adapted from anjuta-2.0.2/global-tags/tm_global_tags.c, thanks.
 * Needs full paths for filenames, except for C/C++ tag files, when CFLAGS includes
 * the relevant path.
 * Example:
 * CFLAGS=-I/home/user/libname-1.x geany -g libname.d.tags libname.h */
int symbols_generate_global_tags(int argc, char **argv, gboolean want_preprocess)
{
	/* -E pre-process, -dD output user macros, -p prof info (?),
	 * -undef remove builtin macros (seems to be needed with FC5 gcc 4.1.1 */
	const char pre_process[] = "gcc -E -dD -p -undef";

	if (argc > 2)
	{
		/* Create global taglist */
		int status;
		char *command;
		const char *tags_file = argv[1];
		char *utf8_fname;
		GeanyFiletype *ft;

		utf8_fname = utils_get_utf8_from_locale(tags_file);
		ft = detect_global_tags_filetype(utf8_fname);
		g_free(utf8_fname);

		if (ft == NULL)
		{
			g_printerr(_("Unknown filetype extension for \"%s\".\n"), tags_file);
			return 1;
		}
		/* load ignore list for C/C++ parser */
		if (ft->id == GEANY_FILETYPES_C || ft->id == GEANY_FILETYPES_CPP)
			load_c_ignore_tags();

		if (want_preprocess && (ft->id == GEANY_FILETYPES_C || ft->id == GEANY_FILETYPES_CPP))
			command = g_strdup_printf("%s %s", pre_process, NVL(getenv("CFLAGS"), ""));
		else
			command = NULL;	/* don't preprocess */

		geany_debug("Generating %s tags file.", ft->name);
		tm_get_workspace();
		status = tm_workspace_create_global_tags(app->configdir, command,
												 (const char **) (argv + 2),
												 argc - 2, tags_file, ft->lang);
		g_free(command);
		symbols_finalize(); /* free c_tags_ignore data */
		if (! status)
		{
			g_printerr(_("Failed to create tags file, perhaps because no tags "
				"were found.\n"));
			return 1;
		}
	}
	else
	{
		g_printerr(_("Usage: %s -g <Tag File> <File list>\n\n"), argv[0]);
		g_printerr(_("Example:\n"
			"CFLAGS=`pkg-config gtk+-2.0 --cflags` %s -g gtk2.c.tags"
			" /usr/include/gtk-2.0/gtk/gtk.h\n"), argv[0]);
		return 1;
	}
	return 0;
}


void symbols_show_load_tags_dialog(void)
{
	GtkWidget *dialog;
	GtkFileFilter *filter;

	dialog = gtk_file_chooser_dialog_new(_("Load Tags"), GTK_WINDOW(main_widgets.window),
		GTK_FILE_CHOOSER_ACTION_OPEN,
		GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
		GTK_STOCK_OPEN, GTK_RESPONSE_OK,
		NULL);
	gtk_widget_set_name(dialog, "GeanyDialog");
	filter = gtk_file_filter_new();
	gtk_file_filter_set_name(filter, _("Geany tag files (*.tags)"));
	gtk_file_filter_add_pattern(filter, "*.tags");
	gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);

	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_OK)
	{
		GSList *flist = gtk_file_chooser_get_filenames(GTK_FILE_CHOOSER(dialog));
		GSList *item;

		for (item = flist; item != NULL; item = g_slist_next(item))
		{
			gchar *fname = item->data;
			gchar *utf8_fname;
			GeanyFiletype *ft;

			utf8_fname = utils_get_utf8_from_locale(fname);
			ft = detect_global_tags_filetype(utf8_fname);

			if (ft != NULL && tm_workspace_load_global_tags(fname, ft->lang))
				ui_set_statusbar(TRUE, _("Loaded %s tags file '%s'."), ft->name, utf8_fname);
			else
				ui_set_statusbar(TRUE, _("Could not load tags file '%s'."), utf8_fname);

			g_free(utf8_fname);
			g_free(fname);
		}
		g_slist_free(flist);
	}
	gtk_widget_destroy(dialog);
}


/* Fills a hash table with filetype keys that hold a linked list of filenames. */
static GHashTable *get_tagfile_hash(const GSList *file_list)
{
	const GSList *node;
	GHashTable *hash = g_hash_table_new(NULL, NULL);

	for (node = file_list; node != NULL; node = g_slist_next(node))
	{
		GList *fnames;
		gchar *fname = node->data;
		gchar *utf8_fname = utils_get_utf8_from_locale(fname);
		GeanyFiletype *ft = detect_global_tags_filetype(utf8_fname);

		g_free(utf8_fname);

		if (FILETYPE_ID(ft) < GEANY_FILETYPES_NONE)
		{
			fnames = g_hash_table_lookup(hash, ft);	/* may be NULL */
			fnames = g_list_append(fnames, fname);
			g_hash_table_insert(hash, ft, fnames);
		}
		else
			geany_debug("Unknown filetype for file '%s'.", fname);
	}
	return hash;
}


static GHashTable *init_user_tags(void)
{
	GSList *file_list;
	GHashTable *lang_hash;

	user_tags_dir = g_strconcat(app->configdir, G_DIR_SEPARATOR_S, "tags", NULL);
	file_list = utils_get_file_list(user_tags_dir, NULL, NULL);
	lang_hash = get_tagfile_hash(file_list);

	/* don't need to delete list contents because they are now used for hash contents */
	g_slist_free(file_list);

	/* create the tags dir for next time if it doesn't exist */
	if (! g_file_test(user_tags_dir, G_FILE_TEST_IS_DIR))
	{
		utils_mkdir(user_tags_dir, FALSE);
	}
	return lang_hash;
}


static void load_user_tags(filetype_id ft_id)
{
	static guchar tags_loaded[GEANY_FILETYPES_NONE] = {0};
	static GHashTable *lang_hash = NULL;
	GList *fnames;
	const GList *node;
	const GeanyFiletype *ft = filetypes[ft_id];

	g_return_if_fail(ft_id < GEANY_FILETYPES_NONE);

	if (tags_loaded[ft_id])
		return;
	tags_loaded[ft_id] = TRUE;	/* prevent reloading */

	if (lang_hash == NULL)
		lang_hash = init_user_tags();

	fnames = g_hash_table_lookup(lang_hash, ft);

	for (node = fnames; node != NULL; node = g_list_next(node))
	{
		const gint tm_lang = ft->lang;
		gchar *fname;

		fname = g_strconcat(user_tags_dir, G_DIR_SEPARATOR_S, node->data, NULL);
		if (tm_workspace_load_global_tags(fname, tm_lang))
		{
			geany_debug("Loaded %s (%s), total tags: %u.", fname, ft->name,
				tm_get_workspace()->global_tags->len);
		}
		g_free(fname);
	}
	g_list_foreach(fnames, (GFunc) g_free, NULL);
	g_list_free(fnames);
	g_hash_table_remove(lang_hash, (gpointer) ft);
}


gboolean symbols_goto_tag(const gchar *name, gboolean definition)
{
	const gint forward_types = tm_tag_prototype_t | tm_tag_externvar_t;
	gint type;
	TMTag *tmtag = NULL;
	GeanyDocument *old_doc = document_get_current();

	/* goto tag definition: all except prototypes / forward declarations / externs */
	type = (definition) ? tm_tag_max_t - forward_types : forward_types;

	/* first look in the current document */
	if (old_doc != NULL && old_doc->tm_file)
		tmtag = find_work_object_tag(old_doc->tm_file, name, type);

	/* if not found, look in the workspace */
	if (tmtag == NULL)
		tmtag = find_workspace_tag(name, type);

	if (tmtag != NULL)
	{
		GeanyDocument *new_doc = document_find_by_real_path(
			tmtag->atts.entry.file->work_object.file_name);

		/* not found in opened document, should open */
		if (new_doc == NULL)
		{
			new_doc = document_open_file(tmtag->atts.entry.file->work_object.file_name, FALSE, NULL, NULL);
		}

		if (navqueue_goto_line(old_doc, new_doc, tmtag->atts.entry.line))
			return TRUE;
	}
	/* if we are here, there was no match and we are beeping ;-) */
	utils_beep();
	if (type == forward_types)
		ui_set_statusbar(FALSE, _("Forward declaration \"%s\" not found."), name);
	else
		ui_set_statusbar(FALSE, _("Definition of \"%s\" not found."), name);
	return FALSE;
}


/* This could perhaps be improved to check for #if, class etc. */
static gint get_function_fold_number(GeanyDocument *doc)
{
	/* for Java the functions are always one fold level above the class scope */
	if (FILETYPE_ID(doc->file_type) == GEANY_FILETYPES_JAVA)
		return SC_FOLDLEVELBASE + 1;
	else
		return SC_FOLDLEVELBASE;
}


/* Should be used only with symbols_get_current_function. */
static gboolean current_function_changed(GeanyDocument *doc, gint cur_line, gint fold_level)
{
	static gint old_line = -2;
	static GeanyDocument *old_doc = NULL;
	static gint old_fold_num = -1;
	const gint fold_num = fold_level & SC_FOLDLEVELNUMBERMASK;
	gboolean ret;

	/* check if the cached line and file index have changed since last time: */
	if (doc == NULL || doc != old_doc)
		ret = TRUE;
	else
	if (cur_line == old_line)
		ret = FALSE;
	else
	{
		/* if the line has only changed by 1 */
		if (abs(cur_line - old_line) == 1)
		{
			const gint fn_fold =
				get_function_fold_number(doc);
			/* It's the same function if the fold number hasn't changed, or both the new
			 * and old fold numbers are above the function fold number. */
			gboolean same =
				fold_num == old_fold_num ||
				(old_fold_num > fn_fold && fold_num > fn_fold);

			ret = ! same;
		}
		else ret = TRUE;
	}

	/* record current line and file index for next time */
	old_line = cur_line;
	old_doc = doc;
	old_fold_num = fold_num;
	return ret;
}


/* Parse the function name up to 2 lines before tag_line.
 * C++ like syntax should be parsed by parse_cpp_function_at_line, otherwise the return
 * type or argument names can be confused with the function name. */
static gchar *parse_function_at_line(ScintillaObject *sci, gint tag_line)
{
	gint start, end, max_pos;
	gchar *cur_tag;
	gint fn_style;

	switch (sci_get_lexer(sci))
	{
		case SCLEX_RUBY:	fn_style = SCE_RB_DEFNAME; break;
		case SCLEX_PYTHON:	fn_style = SCE_P_DEFNAME; break;
		default: fn_style = SCE_C_IDENTIFIER;	/* several lexers use SCE_C_IDENTIFIER */
	}
	start = sci_get_position_from_line(sci, tag_line - 2);
	max_pos = sci_get_position_from_line(sci, tag_line + 1);
	while (sci_get_style_at(sci, start) != fn_style
		&& start < max_pos) start++;

	end = start;
	while (sci_get_style_at(sci, end) == fn_style
		&& end < max_pos) end++;

	if (start == end) return NULL;
	cur_tag = g_malloc(end - start + 1);
	sci_get_text_range(sci, start, end, cur_tag);
	return cur_tag;
}


/* Parse the function name */
static gchar *parse_cpp_function_at_line(ScintillaObject *sci, gint tag_line)
{
	gint start, end, first_pos, max_pos;
	gint tmp;
	gchar c;
	gchar *cur_tag;

	first_pos = end = sci_get_position_from_line(sci, tag_line);
	max_pos = sci_get_position_from_line(sci, tag_line + 1);
	tmp = 0;
	/* goto the begin of function body */
	while (end < max_pos &&
		(tmp = sci_get_char_at(sci, end)) != '{' &&
		tmp != 0) end++;
	if (tmp == 0) end --;

	/* go back to the end of function identifier */
	while (end > 0 && end > first_pos - 500 &&
		(tmp = sci_get_char_at(sci, end)) != '(' &&
		tmp != 0) end--;
	end--;
	if (end < 0) end = 0;

	/* skip whitespaces between identifier and ( */
	while (end > 0 && isspace(sci_get_char_at(sci, end))) end--;

	start = end;
	c = 0;
	/* Use tmp to find SCE_C_IDENTIFIER or SCE_C_GLOBALCLASS chars */
	while (start >= 0 && ((tmp = sci_get_style_at(sci, start)) == SCE_C_IDENTIFIER
		 ||  tmp == SCE_C_GLOBALCLASS
		 || (c = sci_get_char_at(sci, start)) == '~'
		 ||  c == ':'))
		start--;
	if (start != 0 && start < end) start++;	/* correct for last non-matching char */

	if (start == end) return NULL;
	cur_tag = g_malloc(end - start + 2);
	sci_get_text_range(sci, start, end + 1, cur_tag);
	return cur_tag;
}


/* Sets *tagname to point at the current function or tag name.
 * If doc is NULL, reset the cached current tag data to ensure it will be reparsed on the next
 * call to this function.
 * Returns: line number of the current tag, or -1 if unknown. */
gint symbols_get_current_function(GeanyDocument *doc, const gchar **tagname)
{
	static gint tag_line = -1;
	static gchar *cur_tag = NULL;
	gint line;
	gint fold_level;
	TMWorkObject *tm_file;

	if (doc == NULL)	/* reset current function */
	{
		current_function_changed(NULL, -1, -1);
		g_free(cur_tag);
		cur_tag = g_strdup(_("unknown"));
		if (tagname != NULL)
			*tagname = cur_tag;
		tag_line = -1;
		return tag_line;
	}

	line = sci_get_current_line(doc->editor->sci);
	fold_level = sci_get_fold_level(doc->editor->sci, line);
	/* check if the cached line and file index have changed since last time: */
	if (! current_function_changed(doc, line, fold_level))
	{
		/* we can assume same current function as before */
		*tagname = cur_tag;
		return tag_line;
	}
	g_free(cur_tag); /* free the old tag, it will be replaced. */

	/* if line is at base fold level, we're not in a function */
	if ((fold_level & SC_FOLDLEVELNUMBERMASK) == SC_FOLDLEVELBASE)
	{
		cur_tag = g_strdup(_("unknown"));
		*tagname = cur_tag;
		tag_line = -1;
		return tag_line;
	}
	tm_file = doc->tm_file;

	/* if the document has no changes, get the previous function name from TM */
	if(! doc->changed && tm_file != NULL && tm_file->tags_array != NULL)
	{
		const TMTag *tag = (const TMTag*) tm_get_current_function(tm_file->tags_array, line);

		if (tag != NULL)
		{
			gchar *tmp;
			tmp = tag->atts.entry.scope;
			cur_tag = tmp ? g_strconcat(tmp, "::", tag->name, NULL) : g_strdup(tag->name);
			*tagname = cur_tag;
			tag_line = tag->atts.entry.line;
			return tag_line;
		}
	}

	/* parse the current function name here because TM line numbers may have changed,
	 * and it would take too long to reparse the whole file. */
	if (doc->file_type != NULL && doc->file_type->id != GEANY_FILETYPES_NONE)
	{
		const gint fn_fold = get_function_fold_number(doc);

		tag_line = line;
		do	/* find the top level fold point */
		{
			tag_line = sci_get_fold_parent(doc->editor->sci, tag_line);
			fold_level = sci_get_fold_level(doc->editor->sci, tag_line);
		} while (tag_line >= 0 &&
			(fold_level & SC_FOLDLEVELNUMBERMASK) != fn_fold);

		if (tag_line >= 0)
		{
			if (sci_get_lexer(doc->editor->sci) == SCLEX_CPP)
				cur_tag = parse_cpp_function_at_line(doc->editor->sci, tag_line);
			else
				cur_tag = parse_function_at_line(doc->editor->sci, tag_line);

			if (cur_tag != NULL)
			{
				*tagname = cur_tag;
				return tag_line;
			}
		}
	}

	cur_tag = g_strdup(_("unknown"));
	*tagname = cur_tag;
	tag_line = -1;
	return tag_line;
}