jsoniq
Version:
JSONiq implementation for JavaScript
54 lines (52 loc) • 8.23 kB
JavaScript
"use strict";
var IteratorClause_1 = require("./IteratorClause");
class ForIterator extends IteratorClause_1.default {
constructor(position, varName, allowEmpty, positionalVar, expr) {
super(position);
this.varName = varName;
this.allowEmpty = allowEmpty;
this.positionalVar = positionalVar;
this.expr = expr;
}
getBindingVar() {
return this.varName;
}
serializeClause(clauses) {
var clauseId = this.id();
var node = super.serialize("for");
if (this.allowEmpty) {
node.add("let $empty_" + clauseId + " = true;\n");
}
if (this.positionalVar) {
node.add("let $" + this.positionalVar + " = [0];\n");
}
node.add("for(let $" + this.varName + " of ");
node.add(this.expr.serialize());
node.add(") {\n");
node.add(`$${this.varName} = [$${this.varName}];\n`);
if (this.allowEmpty) {
node.add("$empty_" + clauseId + " = false;\n");
}
if (this.positionalVar) {
node.add("$" + this.positionalVar + "[0]++;\n");
}
if (clauses.length > 0) {
node.add(clauses[0].serializeClause(clauses.slice(1)));
}
node.add("}\n");
if (this.allowEmpty) {
node.add(`if($empty_${clauseId}){
let $${this.varName} = undefined;`);
node.add(clauses[0].serializeClause(clauses.slice(1)));
node.add("}");
}
return node;
}
id() {
return Math.floor((1 + Math.random()) * 0x10000)
.toString(16)
.substring(1);
}
}
exports.default = ForIterator;
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