1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 | 10x 10x 105x 101x 101x 101x 101x 101x 101x 101x 101x 101x 248x 248x 248x 117x 140x 117x 9x 108x 91x 17x 8x 7x 7x 7x 1x 123x 123x 123x 123x 5x 5x 118x 4x 4x 114x 5x 5x 114x 1x 113x 1x 112x 112x 112x 101x 296x 5x 5x 16x 16x 11x 5x 5x 101x 289x 8x 8x 7x 8x 101x 224x 65x 24x 65x 65x 101x 59x 59x 14x 14x 101x 202x 250x 21x 17x 1x 16x 17x 4x 4x 101x 381x 226x 12x 12x 9x 9x 5x 5x 200x 3x 3x 69x 8x 8x 275x 101x 101x 101x 101x 1138x 100x 1038x 282x 1x 281x 281x 756x 101x 100x 101x 1138x 1138x 10x 65x 5x 1058x 967x 91x 22x 69x 10x | "use strict"; const QueryParser = require('./QueryParser'); const decoder = require('unidecode'); /** * Helper functionality for parsing query representes * in different formats into the one this package supports. */ class StringQueryParser extends QueryParser { constructor(config = {}) { super(config); } parse(query, maxTokns = 15) { const tokens = Array.from(this.tokenise(query.substr(0, maxTokns * 10))); // lets try some bottom up parsing this.parseJoinAllExactMatchTokens(tokens); this.parseJoinAllNotTokens(tokens); this.parseJoinAllFieldTokens(tokens); this.parseJoinAllRegularTokens(tokens); this.parseJoinAllAndOrTokens(tokens); const fresh = this.getDefault(); fresh.filter = this.treeToFilters(fresh, { maxTokns }, [tokens, 'and']) || []; return fresh; } treeToFilters(fresh, config, tree) { config.tokenIndex = config.tokenIndex || 0; let [values, filter] = tree, field; switch (filter) { case 'and': case 'or': values = values.map(this.treeToFilters.bind(this, fresh, config)) .filter(x => x); if (values.length === 0) { return undefined; } else if (values.length === 1) { return values[0]; } else { return { filter, values }; } case 'not': if (values) { values.splice(2, 0, ...tree.slice(2)) values = this.treeToFilters(fresh, config, values); return { filter, values }; } else { return; } case 'a': case 'exact': filter = tree[3] || (tree[2] && this.fields[tree[2]] && this.fields[tree[2]].filters[0]) || (filter === 'exact' ? this.defaultExactFilter : this.defaultFilter); field = tree[2] || this.defaultField; values = values.split(' '); if (field === 'sort') { fresh.sort = this.sort.indexOf(values[0]) === -1 ? fresh.sort : values[0]; return; } else if (field === 'order') { fresh.order = values[0].toLowerCase() === 'asc' ? 'asc' : 'dsc'; return } else { if (!this.fields[field] && this.fields[this.defaultField].filters.indexOf(field) !== -1) { filter = field; field = this.defaultField; } if (!this.fields[field]) { return } else if (this.fields[field].filters.indexOf(filter) === -1) { return } else Iif (config.tokenIndex > config.maxTokns) { return; } else { config.tokenIndex++; return { filter, field, values, }; } } default: console.log('UNHANDELLED', filter, values); } } parseJoinAllExactMatchTokens(tokens) { for (let i = 0; i < tokens.length; i++) { if (tokens[i][1] === '"') { tokens[i] = ['', 'exact']; while (i + 1 < tokens.length) { const next = tokens.splice(i + 1, 1)[0]; if (next[1] !== '"') { tokens[i][0] += ' ' + next[0]; } else { break; } } tokens[i][0] = tokens[i][0].trim(); } } } parseJoinAllNotTokens(tokens) { for (let i = 0; i < tokens.length; i++) { if (tokens[i][1] === 'not') { let next = false; while (!next && i + 1 < tokens.length) { next = tokens.splice(i + 1, 1)[0]; } tokens[i][0] = next; } } } parseJoinAllFieldTokens(tokens) { for (let i = 0; i < tokens.length; i++) { if (tokens[i][1] === ':' && i > 0 && i + 1 < tokens.length) { if (tokens[i - 1].length > 2) { tokens[i + 1].push(tokens[i - 1][2]); } tokens[i + 1].push(tokens[i - 1][0]); tokens.splice(--i, 2); } } } parseJoinAllRegularTokens(tokens) { for (let i = 1; i < tokens.length; i++) { const signature = tokens[i - 1][1] + tokens[i - 0][1]; if (signature === 'aa' && tokens[i - 1].length === 2 && tokens[i - 0].length === 2) { tokens[i - 1][0] = tokens[i - 1][0] + ' ' + tokens[i - 0][0]; tokens.splice(i--, 1) } } } parseJoinAllAndOrTokens(tokens) { for (let operator of ['and', 'or']) { for (let i = 0; i < tokens.length; i++) { if (tokens[i][1] === operator) { if (i > 0 && i + 1 < tokens.length) { if (tokens[i - 1][1] === operator) { tokens[i - 1][0].push(tokens[i + 1]); } else { tokens[i - 1] = [ [tokens[i - 1], tokens[i + 1]], operator ]; } tokens.splice(i--, 2); } else Eif (typeof tokens[i][0] === 'string') { tokens.splice(i--, 1); } } } } } /** * Probably the smallest tokeniser ever written */ * tokenise(string) { for (let [char, class_] of this.lemmatise(string)) { switch (class_) { case 'a': switch (char.toLowerCase()) { case 'and': yield [char, 'and']; continue; case 'or': yield [char, 'or']; continue; case 'not': yield [char, 'not']; continue; } break; case '-': yield [char, 'not']; continue; case ' ': continue; case '0': yield [char, 'a']; continue; } yield [char, class_]; } } * lemmatise(string) { let last = ''; let lastClass = false; let tokens = Array.from(this.lex(string)); for (let [char, class_] of tokens) { if (!lastClass) { [last, lastClass] = [char, class_]; } else if (lastClass !== class_ && !(lastClass === 'a' && class_ === '0') && !(lastClass === '0' && char === 'e') && !(lastClass === '0' && char === '-')) { if (last === '-' && class_ === '0') { [last, lastClass] = [last + char, class_]; } else { yield [last, lastClass]; [last, lastClass] = [char, class_]; } } else { last += char; } } if (last !== '') { yield [last, lastClass]; } } * lex(string) { for (let char of decoder(string + '') .replace(/\s+/g, ' ') .trim()) { yield [char, this.classifyChar(char)]; } } classifyChar(char) { switch (char) { // whitespace case '"': case "'": case "(": case ")": case "[": case "]": return '"'; case ':': return ':'; case '-': return '-'; default: if ((char >= 'A' && char <= 'Z') || (char >= 'a' && char <= 'z')) { return 'a' } else if ((char >= '0' && char <= '9') || (char === '.')) { return '0' } else { return ' '; } } } } module.exports = StringQueryParser; |