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Diffstat (limited to 'core/string/string_buffer.h')
| -rw-r--r-- | core/string/string_buffer.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/core/string/string_buffer.h b/core/string/string_buffer.h new file mode 100644 index 0000000000..1317b538d4 --- /dev/null +++ b/core/string/string_buffer.h @@ -0,0 +1,162 @@ +/*************************************************************************/ +/* string_buffer.h */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2020 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_BUFFER_H +#define STRING_BUFFER_H + +#include "core/string/ustring.h" + +template <int SHORT_BUFFER_SIZE = 64> +class StringBuffer { + char32_t short_buffer[SHORT_BUFFER_SIZE]; + String buffer; + int string_length = 0; + + _FORCE_INLINE_ char32_t *current_buffer_ptr() { + return static_cast<String &>(buffer).empty() ? short_buffer : buffer.ptrw(); + } + +public: + StringBuffer &append(char32_t p_char); + StringBuffer &append(const String &p_string); + StringBuffer &append(const char *p_str); + StringBuffer &append(const char32_t *p_str, int p_clip_to_len = -1); + + _FORCE_INLINE_ void operator+=(char32_t p_char) { + append(p_char); + } + + _FORCE_INLINE_ void operator+=(const String &p_string) { + append(p_string); + } + + _FORCE_INLINE_ void operator+=(const char *p_str) { + append(p_str); + } + + _FORCE_INLINE_ void operator+=(const char32_t *p_str) { + append(p_str); + } + + StringBuffer &reserve(int p_size); + + int length() const; + + String as_string(); + + double as_double(); + int64_t as_int(); + + _FORCE_INLINE_ operator String() { + return as_string(); + } +}; + +template <int SHORT_BUFFER_SIZE> +StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::append(char32_t p_char) { + reserve(string_length + 2); + current_buffer_ptr()[string_length++] = p_char; + return *this; +} + +template <int SHORT_BUFFER_SIZE> +StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::append(const String &p_string) { + return append(p_string.get_data()); +} + +template <int SHORT_BUFFER_SIZE> +StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::append(const char *p_str) { + int len = strlen(p_str); + reserve(string_length + len + 1); + + char32_t *buf = current_buffer_ptr(); + for (const char *c_ptr = p_str; *c_ptr; ++c_ptr) { + buf[string_length++] = *c_ptr; + } + return *this; +} + +template <int SHORT_BUFFER_SIZE> +StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::append(const char32_t *p_str, int p_clip_to_len) { + int len = 0; + while ((p_clip_to_len < 0 || len < p_clip_to_len) && p_str[len]) { + ++len; + } + reserve(string_length + len + 1); + memcpy(&(current_buffer_ptr()[string_length]), p_str, len * sizeof(char32_t)); + string_length += len; + + return *this; +} + +template <int SHORT_BUFFER_SIZE> +StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::reserve(int p_size) { + if (p_size < SHORT_BUFFER_SIZE || p_size < buffer.size()) { + return *this; + } + + bool need_copy = string_length > 0 && buffer.empty(); + buffer.resize(next_power_of_2(p_size)); + if (need_copy) { + memcpy(buffer.ptrw(), short_buffer, string_length * sizeof(char32_t)); + } + + return *this; +} + +template <int SHORT_BUFFER_SIZE> +int StringBuffer<SHORT_BUFFER_SIZE>::length() const { + return string_length; +} + +template <int SHORT_BUFFER_SIZE> +String StringBuffer<SHORT_BUFFER_SIZE>::as_string() { + current_buffer_ptr()[string_length] = '\0'; + if (buffer.empty()) { + return String(short_buffer); + } else { + buffer.resize(string_length + 1); + return buffer; + } +} + +template <int SHORT_BUFFER_SIZE> +double StringBuffer<SHORT_BUFFER_SIZE>::as_double() { + current_buffer_ptr()[string_length] = '\0'; + return String::to_float(current_buffer_ptr()); +} + +template <int SHORT_BUFFER_SIZE> +int64_t StringBuffer<SHORT_BUFFER_SIZE>::as_int() { + current_buffer_ptr()[string_length] = '\0'; + return String::to_int(current_buffer_ptr()); +} + +#endif // STRING_BUFFER_H |