| 136 | } |
| 137 | |
| 138 | func decodeStringComplex(dst []byte, s string, pos uint) []byte { |
| 139 | i := int(pos) |
| 140 | start := 0 |
| 141 | |
| 142 | for i < len(s) { |
| 143 | b := s[i] |
| 144 | if b >= utf8.RuneSelf { |
| 145 | r, size := utf8.DecodeRuneInString(s[i:]) |
| 146 | if r == utf8.RuneError && size == 1 { |
| 147 | // In case of error, first append previous simple characters to |
| 148 | // the byte slice if any and append a replacement character code |
| 149 | // in place of the invalid sequence. |
| 150 | if start < i { |
| 151 | dst = append(dst, s[start:i]...) |
| 152 | } |
| 153 | dst = append(dst, `\ufffd`...) |
| 154 | i += size |
| 155 | start = i |
| 156 | continue |
| 157 | } |
| 158 | i += size |
| 159 | continue |
| 160 | } |
| 161 | if b >= 0x20 && b <= 0x7e && b != '\\' && b != '"' { |
| 162 | i++ |
| 163 | continue |
| 164 | } |
| 165 | // We encountered a character that needs to be encoded. |
| 166 | // Let's append the previous simple characters to the byte slice |
| 167 | // and switch our operation to read and encode the remainder |
| 168 | // characters byte-by-byte. |
| 169 | if start < i { |
| 170 | dst = append(dst, s[start:i]...) |
| 171 | } |
| 172 | switch b { |
| 173 | case '"', '\\': |
| 174 | dst = append(dst, '\\', b) |
| 175 | case '\b': |
| 176 | dst = append(dst, '\\', 'b') |
| 177 | case '\f': |
| 178 | dst = append(dst, '\\', 'f') |
| 179 | case '\n': |
| 180 | dst = append(dst, '\\', 'n') |
| 181 | case '\r': |
| 182 | dst = append(dst, '\\', 'r') |
| 183 | case '\t': |
| 184 | dst = append(dst, '\\', 't') |
| 185 | default: |
| 186 | dst = append(dst, '\\', 'u', '0', '0', hexTable[b>>4], hexTable[b&0xF]) |
| 187 | } |
| 188 | i++ |
| 189 | start = i |
| 190 | } |
| 191 | if start < len(s) { |
| 192 | dst = append(dst, s[start:]...) |
| 193 | } |
| 194 | return dst |
| 195 | } |