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Mini Shell
Mini Shell
#include "json_utils.h"
namespace node {
std::string EscapeJsonChars(std::string_view str) {
// 'static constexpr' is slightly better than static const
// since the initialization occurs at compile time.
// See https://lemire.me/blog/I3Cah
static constexpr std::string_view control_symbols[0x20] = {
"\\u0000", "\\u0001", "\\u0002", "\\u0003", "\\u0004", "\\u0005",
"\\u0006", "\\u0007", "\\b", "\\t", "\\n", "\\u000b",
"\\f", "\\r", "\\u000e", "\\u000f", "\\u0010", "\\u0011",
"\\u0012", "\\u0013", "\\u0014", "\\u0015", "\\u0016", "\\u0017",
"\\u0018", "\\u0019", "\\u001a", "\\u001b", "\\u001c", "\\u001d",
"\\u001e", "\\u001f"};
std::string ret;
size_t last_pos = 0;
size_t pos = 0;
for (; pos < str.size(); ++pos) {
std::string replace;
char ch = str[pos];
if (ch == '\\') {
replace = "\\\\";
} else if (ch == '\"') {
replace = "\\\"";
} else {
size_t num = static_cast<size_t>(ch);
if (num < 0x20) replace = control_symbols[num];
}
if (!replace.empty()) {
if (pos > last_pos) {
ret += str.substr(last_pos, pos - last_pos);
}
last_pos = pos + 1;
ret += replace;
}
}
// Append any remaining symbols.
if (last_pos < str.size()) {
ret += str.substr(last_pos, pos - last_pos);
}
return ret;
}
std::string Reindent(const std::string& str, int indent_depth) {
if (indent_depth <= 0) return str;
const std::string indent(indent_depth, ' ');
std::string out;
std::string::size_type pos = 0;
for (;;) {
std::string::size_type prev_pos = pos;
pos = str.find('\n', pos);
out.append(indent);
if (pos == std::string::npos) {
out.append(str, prev_pos, std::string::npos);
break;
} else {
pos++;
out.append(str, prev_pos, pos - prev_pos);
}
}
return out;
}
} // namespace node
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