1 files changed, 86 insertions, 2 deletions

diff --git a/core/string_buffer.h b/core/string_buffer.h
index f0ead66bb8..7e9b151bea 100644
--- a/core/string_buffer.h
+++ b/core/string_buffer.h
@@ -32,13 +32,14 @@
 #define STRING_BUFFER_H
 
 #include "ustring.h"
+#include <string.h>
 
+template <int SHORT_BUFFER_SIZE = 64>
 class StringBuffer {
-	static const int SHORT_BUFFER_SIZE = 64;
 
 	CharType short_buffer[SHORT_BUFFER_SIZE];
 	String buffer;
-	int string_length = 0;
+	int string_length;
 
 	_FORCE_INLINE_ CharType *current_buffer_ptr() {
 		return static_cast<Vector<CharType> &>(buffer).empty() ? short_buffer : buffer.ptrw();
@@ -78,6 +79,89 @@ public:
 	_FORCE_INLINE_ operator String() {
 		return as_string();
 	}
+
+	StringBuffer() {
+		string_length = 0;
+	}
 };
 
+template <int SHORT_BUFFER_SIZE>
+StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::append(CharType 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.c_str());
+}
+
+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);
+
+	CharType *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 CharType *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(CharType));
+	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(CharType));
+	}
+
+	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_double(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