godot/core/string/string_builder.cpp

/**************************************************************************/
/*  string_builder.cpp                                                    */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "string_builder.h"

StringBuilder &StringBuilder::append(const String &p_string) {
	if (p_string.is_empty()) {
		return *this;
	}

	strings.push_back(p_string);
	appended_strings.push_back(-1);

	string_length += p_string.length();

	return *this;
}

StringBuilder &StringBuilder::append(const char *p_cstring) {
	int32_t len = strlen(p_cstring);

	c_strings.push_back(p_cstring);
	appended_strings.push_back(len);

	string_length += len;

	return *this;
}

String StringBuilder::as_string() const {
	if (string_length == 0) {
		return "";
	}

	String string;
	string.resize_uninitialized(string_length + 1);
	char32_t *buffer = string.ptrw();

	int current_position = 0;

	int godot_string_elem = 0;
	int c_string_elem = 0;

	for (uint32_t i = 0; i < appended_strings.size(); i++) {
		const int32_t str_len = appended_strings[i];

		if (str_len == -1) {
			// Godot string
			const String &s = strings[godot_string_elem];

			memcpy(buffer + current_position, s.ptr(), s.length() * sizeof(char32_t));

			current_position += s.length();

			godot_string_elem++;
		} else {
			const char *s = c_strings[c_string_elem];

			for (int32_t j = 0; j < str_len; j++) {
				buffer[current_position + j] = s[j];
			}

			current_position += str_len;

			c_string_elem++;
		}
	}
	buffer[current_position] = 0;

	return string;
}