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Проверка, можно ли составить строку из множеств подстрок (в том числе и вложенных подстрок)
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| "use strict"; | |
| function TokenList (rest, part) { | |
| this.rest = rest.rest.substr(part.length); | |
| this.stack = rest.stack.concat([part]); | |
| this.substr = String.prototype.substr.bind(this.rest); | |
| this.indexOf = String.prototype.indexOf.bind(this.rest); | |
| } | |
| function Input (start) { | |
| this.rest = start; | |
| this.stack = []; | |
| this.substr = String.prototype.substr.bind(this.rest); | |
| this.indexOf = String.prototype.indexOf.bind(this.rest); | |
| } | |
| function* check (rest, tree) { | |
| if (tree instanceof Set) { | |
| for (let value of tree) { | |
| if (typeof value === 'string') { | |
| if (rest.indexOf(value) === 0) { | |
| yield new TokenList(rest, value); | |
| } | |
| } else { | |
| yield* check(rest, value); | |
| } | |
| } | |
| } else { | |
| if (typeof tree[0] === 'string') { | |
| if (rest.indexOf(tree[0]) === 0) { | |
| if (tree.length - 1) { | |
| yield* check(new TokenList(rest, tree[0]), tree.slice(1)); | |
| } else { | |
| yield new TokenList(rest, tree[0]); | |
| } | |
| } | |
| } else { | |
| for (let str of check(rest, tree[0])) { | |
| if (tree.length - 1) { | |
| yield* check(str, tree.slice(1)); | |
| } else { | |
| yield str; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| function restore(k, v) { | |
| if (v.hasOwnProperty('v')) { | |
| return new Set(v.v); | |
| } | |
| return v; | |
| } | |
| /** | |
| * Пример | |
| */ | |
| var code = '{"v":[[{"v":["a",[{"v":["","b"]},"e"],"c"]}," ",{"v":["a","b","c"]}," c"]]}', | |
| ast = JSON.parse(code, restore); | |
| //console.log(require('util').inspect(ast, false, 10)); | |
| if (check('be b c', ast).next().value.rest == '') { | |
| console.log('yes') | |
| } else { | |
| console.log('no'); | |
| } |
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