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#include "strings.hh"
namespace nix {
std::vector<char *> stringsToCharPtrs(const Strings & ss)
{
std::vector<char *> res;
for (auto & s : ss) res.push_back((char *) s.c_str());
res.push_back(0);
return res;
}
template<class C> C tokenizeString(std::string_view s, std::string_view separators)
{
C result;
auto pos = s.find_first_not_of(separators, 0);
while (pos != std::string_view::npos) {
auto end = s.find_first_of(separators, pos + 1);
if (end == std::string_view::npos) end = s.size();
result.insert(result.end(), std::string(s, pos, end - pos));
pos = s.find_first_not_of(separators, end);
}
return result;
}
template Strings tokenizeString(std::string_view s, std::string_view separators);
template StringSet tokenizeString(std::string_view s, std::string_view separators);
template std::vector<std::string> tokenizeString(std::string_view s, std::string_view separators);
std::string chomp(std::string_view s)
{
size_t i = s.find_last_not_of(" \n\r\t");
return i == std::string_view::npos ? "" : std::string(s, 0, i + 1);
}
std::string trim(std::string_view s, std::string_view whitespace)
{
auto i = s.find_first_not_of(whitespace);
if (i == s.npos) return "";
auto j = s.find_last_not_of(whitespace);
return std::string(s, i, j == s.npos ? j : j - i + 1);
}
std::string replaceStrings(
std::string res,
std::string_view from,
std::string_view to)
{
if (from.empty()) return res;
size_t pos = 0;
while ((pos = res.find(from, pos)) != std::string::npos) {
res.replace(pos, from.size(), to);
pos += to.size();
}
return res;
}
Rewriter::Rewriter(std::map<std::string, std::string> rewrites)
: rewrites(std::move(rewrites))
{
for (const auto & [k, v] : this->rewrites) {
assert(!k.empty());
initials.push_back(k[0]);
}
std::ranges::sort(initials);
auto [firstDupe, end] = std::ranges::unique(initials);
initials.erase(firstDupe, end);
}
std::string Rewriter::operator()(std::string s)
{
size_t j = 0;
while ((j = s.find_first_of(initials, j)) != std::string::npos) {
size_t skip = 1;
for (auto & [from, to] : rewrites) {
if (s.compare(j, from.size(), from) == 0) {
s.replace(j, from.size(), to);
skip = to.size();
break;
}
}
j += skip;
}
return s;
}
std::string toLower(const std::string & s)
{
std::string r(s);
for (auto & c : r)
c = std::tolower(c);
return r;
}
std::string shellEscape(const std::string_view s)
{
std::string r;
r.reserve(s.size() + 2);
r += "'";
for (auto & i : s)
if (i == '\'') r += "'\\''"; else r += i;
r += '\'';
return r;
}
constexpr char base64Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::string base64Encode(std::string_view s)
{
std::string res;
res.reserve((s.size() + 2) / 3 * 4);
int data = 0, nbits = 0;
for (char c : s) {
data = data << 8 | (unsigned char) c;
nbits += 8;
while (nbits >= 6) {
nbits -= 6;
res.push_back(base64Chars[data >> nbits & 0x3f]);
}
}
if (nbits) res.push_back(base64Chars[data << (6 - nbits) & 0x3f]);
while (res.size() % 4) res.push_back('=');
return res;
}
std::string base64Decode(std::string_view s)
{
constexpr char npos = -1;
constexpr std::array<char, 256> base64DecodeChars = [&]() {
std::array<char, 256> result{};
for (auto& c : result)
c = npos;
for (int i = 0; i < 64; i++)
result[base64Chars[i]] = i;
return result;
}();
std::string res;
// Some sequences are missing the padding consisting of up to two '='.
// vvv
res.reserve((s.size() + 2) / 4 * 3);
unsigned int d = 0, bits = 0;
for (char c : s) {
if (c == '=') break;
if (c == '\n') continue;
char digit = base64DecodeChars[(unsigned char) c];
if (digit == npos)
throw Error("invalid character in Base64 string: '%c'", c);
bits += 6;
d = d << 6 | digit;
if (bits >= 8) {
res.push_back(d >> (bits - 8) & 0xff);
bits -= 8;
}
}
return res;
}
std::string stripIndentation(std::string_view s)
{
size_t minIndent = 10000;
size_t curIndent = 0;
bool atStartOfLine = true;
for (auto & c : s) {
if (atStartOfLine && c == ' ')
curIndent++;
else if (c == '\n') {
if (atStartOfLine)
minIndent = std::max(minIndent, curIndent);
curIndent = 0;
atStartOfLine = true;
} else {
if (atStartOfLine) {
minIndent = std::min(minIndent, curIndent);
atStartOfLine = false;
}
}
}
std::string res;
size_t pos = 0;
while (pos < s.size()) {
auto eol = s.find('\n', pos);
if (eol == s.npos) eol = s.size();
if (eol - pos > minIndent)
res.append(s.substr(pos + minIndent, eol - pos - minIndent));
res.push_back('\n');
pos = eol + 1;
}
return res;
}
std::pair<std::string_view, std::string_view> getLine(std::string_view s)
{
auto newline = s.find('\n');
if (newline == s.npos) {
return {s, ""};
} else {
auto line = s.substr(0, newline);
if (!line.empty() && line[line.size() - 1] == '\r')
line = line.substr(0, line.size() - 1);
return {line, s.substr(newline + 1)};
}
}
std::string showBytes(uint64_t bytes)
{
return fmt("%.2f MiB", bytes / (1024.0 * 1024.0));
}
}
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