| … | |
… | |
| 187 | return SvUTF8 (sv) |
187 | return SvUTF8 (sv) |
| 188 | ? utf8_distance (offset, SvPVX (sv)) |
188 | ? utf8_distance (offset, SvPVX (sv)) |
| 189 | : offset - SvPVX (sv); |
189 | : offset - SvPVX (sv); |
| 190 | } |
190 | } |
| 191 | |
191 | |
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192 | ///////////////////////////////////////////////////////////////////////////// |
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193 | // fp hell |
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194 | |
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195 | // scan a group of digits, and a trailing exponent |
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196 | static void |
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197 | json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp) |
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198 | { |
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199 | UV uaccum = 0; |
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200 | int eaccum = 0; |
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201 | |
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202 | for (;;) |
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203 | { |
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204 | U8 dig = (U8)*s - '0'; |
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205 | |
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206 | if (expect_false (dig >= 10)) |
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207 | { |
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208 | if (dig == (U8)((U8)'.' - (U8)'0')) |
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209 | { |
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210 | ++s; |
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211 | json_atof_scan1 (s, accum, expo, 1); |
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212 | } |
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213 | else if ((dig | ' ') == 'e' - '0') |
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214 | { |
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215 | int exp2 = 0; |
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216 | int neg = 0; |
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217 | |
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218 | ++s; |
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219 | |
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220 | if (*s == '-') |
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221 | { |
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222 | ++s; |
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223 | neg = 1; |
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224 | } |
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225 | else if (*s == '+') |
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226 | ++s; |
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227 | |
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228 | while ((dig = (U8)*s - '0') < 10) |
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229 | exp2 = exp2 * 10 + *s++ - '0'; |
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230 | |
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231 | *expo += neg ? -exp2 : exp2; |
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232 | } |
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233 | |
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234 | break; |
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235 | } |
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236 | |
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237 | ++s; |
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238 | |
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239 | uaccum = uaccum * 10 + dig; |
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240 | ++eaccum; |
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241 | |
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242 | // if we have too many digits, then recurse for more |
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243 | // we actually do this for rather few digits |
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244 | if (uaccum >= (UV_MAX - 9) / 10) |
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245 | { |
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246 | if (postdp) *expo -= eaccum; |
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247 | json_atof_scan1 (s, accum, expo, postdp); |
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248 | if (postdp) *expo += eaccum; |
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249 | |
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250 | break; |
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251 | } |
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252 | } |
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253 | |
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254 | if (postdp) *expo -= eaccum; |
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255 | *accum += uaccum * pow (10., *expo); |
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256 | *expo += eaccum; |
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257 | } |
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258 | |
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259 | static NV |
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260 | json_atof (const char *s) |
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261 | { |
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262 | NV accum = 0.; |
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263 | int expo = 0; |
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264 | int neg = 0; |
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265 | |
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266 | if (*s == '-') |
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267 | { |
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268 | ++s; |
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269 | neg = 1; |
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270 | } |
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271 | |
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272 | json_atof_scan1 (s, &accum, &expo, 0); |
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273 | |
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274 | return neg ? -accum : accum; |
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275 | } |
| 192 | ///////////////////////////////////////////////////////////////////////////// |
276 | ///////////////////////////////////////////////////////////////////////////// |
| 193 | // encoder |
277 | // encoder |
| 194 | |
278 | |
| 195 | // structure used for encoding JSON |
279 | // structure used for encoding JSON |
| 196 | typedef struct |
280 | typedef struct |
| … | |
… | |
| 1119 | } |
1203 | } |
| 1120 | |
1204 | |
| 1121 | len -= *start == '-' ? 1 : 0; |
1205 | len -= *start == '-' ? 1 : 0; |
| 1122 | |
1206 | |
| 1123 | // does not fit into IV or UV, try NV |
1207 | // does not fit into IV or UV, try NV |
| 1124 | if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len) |
1208 | if (len <= NV_DIG) |
| 1125 | #if defined (LDBL_DIG) |
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| 1126 | || (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len) |
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| 1127 | #endif |
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| 1128 | ) |
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| 1129 | // fits into NV without loss of precision |
1209 | // fits into NV without loss of precision |
| 1130 | return newSVnv (Atof (start)); |
1210 | return newSVnv (json_atof (start)); |
| 1131 | |
1211 | |
| 1132 | // everything else fails, convert it to a string |
1212 | // everything else fails, convert it to a string |
| 1133 | return newSVpvn (start, dec->cur - start); |
1213 | return newSVpvn (start, dec->cur - start); |
| 1134 | } |
1214 | } |
| 1135 | |
1215 | |
| 1136 | // loss of precision here |
1216 | // loss of precision here |
| 1137 | return newSVnv (Atof (start)); |
1217 | return newSVnv (json_atof (start)); |
| 1138 | |
1218 | |
| 1139 | fail: |
1219 | fail: |
| 1140 | return 0; |
1220 | return 0; |
| 1141 | } |
1221 | } |
| 1142 | |
1222 | |
| … | |
… | |
| 1963 | json_init (&json); |
2043 | json_init (&json); |
| 1964 | json.flags |= ix; |
2044 | json.flags |= ix; |
| 1965 | XPUSHs (decode_json (jsonstr, &json, 0)); |
2045 | XPUSHs (decode_json (jsonstr, &json, 0)); |
| 1966 | } |
2046 | } |
| 1967 | |
2047 | |
| 1968 | |
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