jsoniq/lib/runtime/iterators/flwor/LetIterator.ts

JSONiq implementation for JavaScript

/// <reference path="../../../../typings/tsd.d.ts" />
import * as SourceMap from "source-map";

import Iterator from "../Iterator";
import IteratorClause from "./IteratorClause";
import Position from "../../../compiler/parsers/Position";

export default class LetIterator extends IteratorClause {

    private varName: string;
    private expr: Iterator;
    private overrides: boolean;

    constructor(
        position: Position,
        varName: string,
        expr: Iterator,
        overrides: boolean
    ) {
        super(position);
        this.varName = varName;
        this.expr = expr;
        this.overrides = overrides;
    }

    getBindingVar(): string {
        return this.varName;
    }

    serializeClause(clauses: IteratorClause[]): SourceMap.SourceNode {
        var node = super.serialize("let");
        if(!this.overrides) {
          node.add("let ");
        }
        node.add("$" + this.varName + " = r.load(")
            .add(this.expr.serialize())
            .add(");\n")
            .add(clauses[0].serializeClause(clauses.slice(1)));
        return node;
    }
}