Core: Ensure classes match their header filename

Also drop some unused files.

Renamed:
- `core/dvector.h` -> `pool_vector.h`
- `core/io/resource_import.h` -> `resource_importer.h`
- `core/sort.h` -> `sort_array.h`
- `core/string_db.h` -> `string_name.h`

Dropped:
- `core/allocators.h`
- `core/os/shell.h`
- `core/variant_construct_string.cpp`

1 files changed, 172 insertions, 0 deletions

diff --git a/core/string_name.h b/core/string_name.h
new file mode 100644
index 0000000000..0984b0181f
--- /dev/null
+++ b/core/string_name.h
@@ -0,0 +1,172 @@
+/*************************************************************************/
+/*  string_name.h                                                        */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef STRING_NAME_H
+#define STRING_NAME_H
+
+#include "core/os/mutex.h"
+#include "core/safe_refcount.h"
+#include "core/ustring.h"
+/**
+	@author Juan Linietsky <reduzio@gmail.com>
+*/
+
+struct StaticCString {
+
+	const char *ptr;
+	static StaticCString create(const char *p_ptr);
+};
+
+class StringName {
+
+	enum {
+
+		STRING_TABLE_BITS = 12,
+		STRING_TABLE_LEN = 1 << STRING_TABLE_BITS,
+		STRING_TABLE_MASK = STRING_TABLE_LEN - 1
+	};
+
+	struct _Data {
+		SafeRefCount refcount;
+		const char *cname;
+		String name;
+
+		String get_name() const { return cname ? String(cname) : name; }
+		int idx;
+		uint32_t hash;
+		_Data *prev;
+		_Data *next;
+		_Data() {
+			cname = NULL;
+			next = prev = NULL;
+			idx = 0;
+			hash = 0;
+		}
+	};
+
+	static _Data *_table[STRING_TABLE_LEN];
+
+	_Data *_data;
+
+	union _HashUnion {
+
+		_Data *ptr;
+		uint32_t hash;
+	};
+
+	void unref();
+	friend void register_core_types();
+	friend void unregister_core_types();
+
+	static Mutex *lock;
+	static void setup();
+	static void cleanup();
+	static bool configured;
+
+	StringName(_Data *p_data) { _data = p_data; }
+
+public:
+	operator const void *() const { return (_data && (_data->cname || !_data->name.empty())) ? (void *)1 : 0; }
+
+	bool operator==(const String &p_name) const;
+	bool operator==(const char *p_name) const;
+	bool operator!=(const String &p_name) const;
+	_FORCE_INLINE_ bool operator<(const StringName &p_name) const {
+
+		return _data < p_name._data;
+	}
+	_FORCE_INLINE_ bool operator==(const StringName &p_name) const {
+		// the real magic of all this mess happens here.
+		// this is why path comparisons are very fast
+		return _data == p_name._data;
+	}
+	_FORCE_INLINE_ uint32_t hash() const {
+
+		if (_data)
+			return _data->hash;
+		else
+			return 0;
+	}
+	_FORCE_INLINE_ const void *data_unique_pointer() const {
+		return (void *)_data;
+	}
+	bool operator!=(const StringName &p_name) const;
+
+	_FORCE_INLINE_ operator String() const {
+
+		if (_data) {
+			if (_data->cname)
+				return String(_data->cname);
+			else
+				return _data->name;
+		}
+
+		return String();
+	}
+
+	static StringName search(const char *p_name);
+	static StringName search(const CharType *p_name);
+	static StringName search(const String &p_name);
+
+	struct AlphCompare {
+
+		_FORCE_INLINE_ bool operator()(const StringName &l, const StringName &r) const {
+
+			const char *l_cname = l._data ? l._data->cname : "";
+			const char *r_cname = r._data ? r._data->cname : "";
+
+			if (l_cname) {
+
+				if (r_cname)
+					return is_str_less(l_cname, r_cname);
+				else
+					return is_str_less(l_cname, r._data->name.ptr());
+			} else {
+
+				if (r_cname)
+					return is_str_less(l._data->name.ptr(), r_cname);
+				else
+					return is_str_less(l._data->name.ptr(), r._data->name.ptr());
+			}
+		}
+	};
+
+	void operator=(const StringName &p_name);
+	StringName(const char *p_name);
+	StringName(const StringName &p_name);
+	StringName(const String &p_name);
+	StringName(const StaticCString &p_static_string);
+	StringName();
+	~StringName();
+};
+
+StringName _scs_create(const char *p_chr);
+
+#endif // STRING_NAME_H