88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/private/json.h
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// Purpose: Helper functions to handle JSON data
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// Author: Tobias Taschner
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// Created: 2020-01-17
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// Copyright: (c) 2020 wxWidgets development team
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_PRIVATE_JSON_H_
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#define _WX_PRIVATE_JSON_H_
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namespace wxJSON
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{
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// Decode a string literal including escape sequences
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// Returns false if the input string is not a valid JSON string
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bool DecodeString(const wxString& in, wxString* out)
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{
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const wxWCharBuffer buf = in.wc_str();
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const wchar_t* ch = buf.data();
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// String has to chart with a quote
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if (*(ch++) != '"')
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return false;
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out->reserve(buf.length());
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const wchar_t* end = buf.data() + buf.length() - 1;
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for (; ch < end; ++ch)
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{
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if (*ch == '\\')
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{
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switch (*(++ch))
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{
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case 'b':
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out->append('\b');
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break;
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case 'n':
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out->append('\n');
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break;
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case 'r':
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out->append('\r');
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break;
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case 't':
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out->append('\t');
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break;
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case 'f':
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out->append('\f');
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break;
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case '/':
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out->append('/');
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break;
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case '"':
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out->append('"');
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break;
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case '\\':
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out->append('\\');
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break;
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case 'u':
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#if SIZEOF_WCHAR_T == 2
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// In this case, we handle surrogates without doing anything special was wchar_t strings use UTF-17 encoding.
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if (wxIsxdigit(ch[1]) && wxIsxdigit(ch[2]) &&
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wxIsxdigit(ch[3]) && wxIsxdigit(ch[4]))
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{
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wchar_t uchar = wxHexToDec(wxString(&ch[3], 2)) |
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wxHexToDec(wxString(&ch[1], 2)) >> 8;
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out->append(uchar);
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ch += 4;
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}
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#else
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#error Implement correct surrogate handling.
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#endif
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break;
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default:
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return false;
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break;
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}
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}
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else
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out->append(*ch);
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}
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// String has to end with a quote
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return (*ch) == '"';
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}
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} // namespace JSON
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#endif // _WX_PRIVATE_JSON_H_
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