39 lines
886 B
JavaScript
39 lines
886 B
JavaScript
"use strict";
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var levenshtein = require("../../../helpers/levenshtein");
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var t = require("../../../types");
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exports.optional = true;
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exports.Identifier = function (node, parent, scope, file) {
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if (!t.isReferenced(node, parent)) return;
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if (scope.hasBinding(node.name)) return;
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var msg = "Reference to undeclared variable";
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// get the closest declaration to offer as a suggestion
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// the variable name may have just been mistyped
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var bindings = scope.getAllBindings();
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var closest;
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var shortest = -1;
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for (var name in bindings) {
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var distance = levenshtein(node.name, name);
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if (distance <= 0 || distance > 3) continue;
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if (distance <= shortest) continue;
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closest = name;
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shortest = distance;
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}
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if (closest) {
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msg += " - Did you mean " + closest + "?";
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}
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//
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throw file.errorWithNode(node, msg, ReferenceError);
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};
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