godot/core/string/string_builder.cpp

/*************************************************************************/
/*  string_builder.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "string_builder.h"

#include <string.h>

StringBuilder &StringBuilder::append(const String &p_string) {
	if (p_string == String()) {
		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 "";
	}

	char32_t *buffer = memnew_arr(char32_t, string_length);

	int current_position = 0;

	int godot_string_elem = 0;
	int c_string_elem = 0;

	for (int i = 0; i < appended_strings.size(); i++) {
		if (appended_strings[i] == -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 < appended_strings[i]; j++) {
				buffer[current_position + j] = s[j];
			}

			current_position += appended_strings[i];

			c_string_elem++;
		}
	}

	String final_string = String(buffer, string_length);

	memdelete_arr(buffer);

	return final_string;
}