88 lines
2.4 KiB
JavaScript
88 lines
2.4 KiB
JavaScript
var util = require("../../util");
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var t = require("../../types");
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exports.ForOfStatement = function (node, parent, file, scope) {
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var callback = spec;
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if (file.isFast("forOf")) callback = fast;
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var build = callback(node, parent, file, scope);
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var loop = build.loop;
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var block = loop.body;
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// inherit comments from the original loop
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t.inheritsComments(loop, node);
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// ensure that it's a block so we can take all it's statemetns
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t.ensureBlock(node);
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// push the value declaration to the new loop body
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if (build.declar) block.body.push(build.declar);
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// push the rest of the original loop body onto our new body
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block.body = block.body.concat(node.body.body);
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return loop;
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};
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var fast = function (node, parent, file, scope) {
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var left = node.left;
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var declar, id;
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if (t.isIdentifier(left) || t.isPattern(left)) {
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// for (i of test), for ({ i } of test)
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id = left;
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} else if (t.isVariableDeclaration(left)) {
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// for (var i of test)
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id = left.declarations[0].id;
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declar = t.variableDeclaration(left.kind, [
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t.variableDeclarator(id)
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]);
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} else {
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throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
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}
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var loop = util.template("for-of-fast", {
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LOOP_OBJECT: file.generateUidIdentifier("loopObject", scope),
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IS_ARRAY: file.generateUidIdentifier("isArray", scope),
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OBJECT: node.right,
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INDEX: file.generateUidIdentifier("i", scope),
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ID: id
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});
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return {
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declar: declar,
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loop: loop
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};
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};
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var spec = function (node, parent, file, scope) {
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var left = node.left;
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var declar;
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var stepKey = file.generateUidIdentifier("step", scope);
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var stepValue = t.memberExpression(stepKey, t.identifier("value"));
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if (t.isIdentifier(left) || t.isPattern(left)) {
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// for (i of test), for ({ i } of test)
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declar = t.expressionStatement(t.assignmentExpression("=", left, stepValue));
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} else if (t.isVariableDeclaration(left)) {
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// for (var i of test)
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declar = t.variableDeclaration(left.kind, [
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t.variableDeclarator(left.declarations[0].id, stepValue)
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]);
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} else {
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throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
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}
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var loop = util.template("for-of", {
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ITERATOR_KEY: file.generateUidIdentifier("iterator", scope),
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STEP_KEY: stepKey,
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OBJECT: node.right
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});
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return {
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declar: declar,
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loop: loop
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};
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};
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