pike.git
/
src
/
utf8_string.cpp
version
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pike.git/src/utf8_string.cpp:1:
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#include "sass.hpp"
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#include <string>
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#include <vector>
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#include <cstdlib>
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#include <cmath>
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#include "utf8.h"
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namespace Sass {
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namespace UTF_8 {
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using std::string;
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// naming conventions:
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// offset: raw byte offset (0 based)
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// position: code point offset (0 based)
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// index: code point offset (1 based or negative)
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// function that will count the number of code points (utf-8 characters) from the given beginning to the given end
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size_t code_point_count(const string& str, size_t start, size_t end) {
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return utf8::distance(str.begin() + start, str.begin() + end);
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}
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size_t code_point_count(const string& str) {
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return utf8::distance(str.begin(), str.end());
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}
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// function that will return the byte offset at a code point position
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size_t offset_at_position(const string& str, size_t position) {
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string::const_iterator it = str.begin();
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utf8::advance(it, position, str.end());
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return std::distance(str.begin(), it);
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}
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// function that returns number of bytes in a character at offset
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size_t code_point_size_at_offset(const string& str, size_t offset) {
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// get iterator from string and forward by offset
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string::const_iterator stop = str.begin() + offset;
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// check if beyond boundary
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if (stop == str.end()) return 0;
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// advance by one code point
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utf8::advance(stop, 1, str.end());
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// calculate offset for code point
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return stop - str.begin() - offset;
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}
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// function that will return a normalized index, given a crazy one
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size_t normalize_index(int index, size_t len) {
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long signed_len = static_cast<long>(len);
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// assuming the index is 1-based
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// we are returning a 0-based index
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if (index > 0 && index <= signed_len) {
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// positive and within string length
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return index-1;
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}
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else if (index > signed_len) {
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// positive and past string length
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return len;
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}
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else if (index == 0) {
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return 0;
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}
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else if (std::abs((double)index) <= signed_len) {
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// negative and within string length
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return index + signed_len;
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}
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else {
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// negative and past string length
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return 0;
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}
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}
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#ifdef _WIN32
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// utf16 functions
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using std::wstring;
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// convert from utf16/wide string to utf8 string
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string convert_from_utf16(const wstring& utf16)
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{
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string utf8;
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// pre-allocate expected memory
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utf8.reserve(sizeof(utf16)/2);
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utf8::utf16to8(utf16.begin(), utf16.end(),
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back_inserter(utf8));
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return utf8;
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}
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// convert from utf8 string to utf16/wide string
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wstring convert_to_utf16(const string& utf8)
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{
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wstring utf16;
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// pre-allocate expected memory
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utf16.reserve(code_point_count(utf8)*2);
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utf8::utf8to16(utf8.begin(), utf8.end(),
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back_inserter(utf16));
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return utf16;
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}
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#endif
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}
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}
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