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add template argument for size in StringBuffer

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Until now the pre-allocated array size was defined to be 64 without
a way of adjusting it from the calling side.

This commit adds the size as a template parameter.
This commit is contained in:
karroffel
2018-01-20 20:03:17 +01:00
parent 00387cbe1b
commit ac2a9bb267
3 changed files with 84 additions and 107 deletions
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82
core/string_buffer.h
View File

@@ -32,9 +32,10 @@
#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;
@@ -80,4 +81,83 @@ public:
}
};
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