a777bbd571PR-URL: https://github.com/nodejs/node/pull/47524 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: James M Snell <jasnell@gmail.com>
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
#include "json_utils.h"
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namespace node {
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std::string EscapeJsonChars(std::string_view str) {
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// 'static constexpr' is slightly better than static const
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// since the initialization occurs at compile time.
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// See https://lemire.me/blog/I3Cah
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static constexpr std::string_view control_symbols[0x20] = {
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"\\u0000", "\\u0001", "\\u0002", "\\u0003", "\\u0004", "\\u0005",
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"\\u0006", "\\u0007", "\\b", "\\t", "\\n", "\\u000b",
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"\\f", "\\r", "\\u000e", "\\u000f", "\\u0010", "\\u0011",
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"\\u0012", "\\u0013", "\\u0014", "\\u0015", "\\u0016", "\\u0017",
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"\\u0018", "\\u0019", "\\u001a", "\\u001b", "\\u001c", "\\u001d",
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"\\u001e", "\\u001f"};
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std::string ret;
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size_t last_pos = 0;
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size_t pos = 0;
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for (; pos < str.size(); ++pos) {
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std::string replace;
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char ch = str[pos];
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if (ch == '\\') {
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replace = "\\\\";
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} else if (ch == '\"') {
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replace = "\\\"";
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} else {
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size_t num = static_cast<size_t>(ch);
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if (num < 0x20) replace = control_symbols[num];
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}
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if (!replace.empty()) {
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if (pos > last_pos) {
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ret += str.substr(last_pos, pos - last_pos);
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}
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last_pos = pos + 1;
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ret += replace;
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}
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}
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// Append any remaining symbols.
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if (last_pos < str.size()) {
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ret += str.substr(last_pos, pos - last_pos);
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}
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return ret;
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}
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std::string Reindent(const std::string& str, int indent_depth) {
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if (indent_depth <= 0) return str;
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const std::string indent(indent_depth, ' ');
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std::string out;
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std::string::size_type pos = 0;
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for (;;) {
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std::string::size_type prev_pos = pos;
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pos = str.find('\n', pos);
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out.append(indent);
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if (pos == std::string::npos) {
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out.append(str, prev_pos, std::string::npos);
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break;
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} else {
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pos++;
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out.append(str, prev_pos, pos - prev_pos);
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}
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}
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return out;
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}
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} // namespace node
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