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jsoniq

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JSONiq implementation for JavaScript

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"use strict"; /// <reference path="../../../../typings/tsd.d.ts" /> var _ = require("lodash"); var OrderByIterator_1 = require("./OrderByIterator"); var ReturnTupleIterator_1 = require("./ReturnTupleIterator"); var Iterator_1 = require("../Iterator"); class FLWORIterator extends Iterator_1.default { constructor(position, clauses) { super(position); this.clauses = clauses; } isMaterializingClause(it) { return it instanceof OrderByIterator_1.default; } serializeAsStream(node, clauses) { node.add("(function *(){") .add(clauses[0].serializeClause(clauses.slice(1))) .add("})()"); return this; } serializeChunk(node, left, op, right, remaining) { var bindings = {}; left.forEach(clause => { if (clause.getBindingVar() !== undefined) { bindings[clause.getBindingVar()] = true; } }); var leftIts = left.slice(1); leftIts.push(new ReturnTupleIterator_1.default(this.position, Object.keys(bindings), op)); node.add("(function *(){\n") .add("let tuples = (function *(){\n") .add(left[0].serializeClause(leftIts)) .add("})();") .add("tuples = r.processTuples(tuples);\n") .add("for(var i = 0; i < tuples.length; i++) {\nlet tuple = tuples[i];\n"); _.forEach(bindings, (v, varName) => { node.add(`let $${varName} = tuple['$${varName}'];\n`); }); node.add(right[0].serializeClause(right.slice(1))) .add("\n}\n})()"); if (remaining.length > 0) { this.serializeChunk(node, remaining[0], remaining[1], remaining[2], remaining.slice(3)); } return this; } serialize() { var chunks = [[]]; this.clauses.forEach((clause, index) => { var prev = this.clauses[index - 1]; var next = this.clauses[index + 1]; if (this.isMaterializingClause(clause) && !this.isMaterializingClause(prev)) { chunks.push([]); chunks[chunks.length - 1].push(clause); if (!this.isMaterializingClause(next)) { chunks.push([]); } } else { chunks[chunks.length - 1].push(clause); } }); var node = super.serialize("flwor"); if (chunks.length > 1) { this.serializeChunk(node, chunks[0], chunks[1], chunks[2], chunks.slice(3)); } else { this.serializeAsStream(node, this.clauses); } return node; } } exports.default = FLWORIterator; //# 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<reference path=\"../../../../typings/tsd.d.ts\" />\nimport * as _ from \"lodash\";\nimport * as SourceMap from \"source-map\";\n\nimport Position from \"../../../compiler/parsers/Position\";\nimport IteratorClause from \"./IteratorClause\";\nimport OrderByIterator from \"./OrderByIterator\";\nimport ReturnTupleIterator from \"./ReturnTupleIterator\";\nimport Iterator from \"../Iterator\";\n\nexport default class FLWORIterator extends Iterator {\n\n    private clauses: IteratorClause[];\n\n\n    constructor(position: Position, clauses: Iterator[]) {\n        super(position);\n        this.clauses = <IteratorClause[]>clauses;\n    }\n\n    private isMaterializingClause(it: IteratorClause): boolean {\n        return it instanceof OrderByIterator;\n    }\n\n    private serializeAsStream(node, clauses: IteratorClause[]): FLWORIterator {\n        node.add(\"(function *(){\")\n            .add(clauses[0].serializeClause(clauses.slice(1)))\n            .add(\"})()\");\n        return this;\n    }\n\n    private serializeChunk(\n        node: SourceMap.SourceNode,\n        left: IteratorClause[],\n        op: IteratorClause[],\n        right: IteratorClause[],\n        remaining: any[]\n    ): FLWORIterator {\n        var bindings = {};\n        left.forEach(clause => {\n            if(clause.getBindingVar() !== undefined) {\n                bindings[clause.getBindingVar()] = true;\n            }\n        });\n        var leftIts = left.slice(1);\n        leftIts.push(new ReturnTupleIterator(this.position, Object.keys(bindings), op));\n        node.add(\"(function *(){\\n\")\n            .add(\"let tuples = (function *(){\\n\")\n            .add(left[0].serializeClause(leftIts))\n            //.add()\n            .add(\"})();\")\n            //.add(op[0].serializeClause(op.slice(1)))\n            .add(\"tuples = r.processTuples(tuples);\\n\")\n            .add(\"for(var i = 0; i < tuples.length; i++) {\\nlet tuple = tuples[i];\\n\");\n        _.forEach(bindings, (v, varName) => {\n            node.add(`let $${varName} = tuple['$${varName}'];\\n`);\n        });\n        node.add(right[0].serializeClause(right.slice(1)))\n            .add(\"\\n}\\n})()\");\n\n        if(remaining.length > 0) {\n            this.serializeChunk(node, remaining[0], remaining[1], remaining[2], remaining.slice(3));\n        }\n\n        return this;\n    }\n\n    serialize(): SourceMap.SourceNode {\n        var chunks = [[]];\n        this.clauses.forEach((clause, index) => {\n            var prev = this.clauses[index - 1];\n            var next = this.clauses[index + 1];\n            if(this.isMaterializingClause(clause) && !this.isMaterializingClause(prev)) {\n                chunks.push([]);\n                chunks[chunks.length - 1].push(clause);\n                if(!this.isMaterializingClause(next)) {\n                    chunks.push([]);\n                }\n            } else {\n                chunks[chunks.length - 1].push(clause);\n            }\n        });\n\n        var node = super.serialize(\"flwor\");\n        if(chunks.length > 1) {\n            this.serializeChunk(node, chunks[0], chunks[1], chunks[2], chunks.slice(3));\n        } else {\n            this.serializeAsStream(node, this.clauses);\n        }\n        return node;\n\n    }\n}\n"],"sourceRoot":"/source/"}