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regenerator-transform - npm Package Compare versions

Comparing version 0.12.4 to 0.13.0

324

lib/emit.js
"use strict";
var _assert = require("assert");
var _assert = _interopRequireDefault(require("assert"));
var _assert2 = _interopRequireDefault(_assert);
var leap = _interopRequireWildcard(require("./leap"));
var _leap = require("./leap");
var meta = _interopRequireWildcard(require("./meta"));
var leap = _interopRequireWildcard(_leap);
var util = _interopRequireWildcard(require("./util"));
var _meta = require("./meta");
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
var meta = _interopRequireWildcard(_meta);
var _util = require("./util");
var util = _interopRequireWildcard(_util);
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

@@ -29,37 +21,29 @@

*/
var hasOwn = Object.prototype.hasOwnProperty;
function Emitter(contextId) {
_assert2.default.ok(this instanceof Emitter);
_assert.default.ok(this instanceof Emitter);
util.getTypes().assertIdentifier(contextId);
util.getTypes().assertIdentifier(contextId); // Used to generate unique temporary names.
// Used to generate unique temporary names.
this.nextTempId = 0;
// In order to make sure the context object does not collide with
this.nextTempId = 0; // In order to make sure the context object does not collide with
// anything in the local scope, we might have to rename it, so we
// refer to it symbolically instead of just assuming that it will be
// called "context".
this.contextId = contextId;
// An append-only list of Statements that grows each time this.emit is
this.contextId = contextId; // An append-only list of Statements that grows each time this.emit is
// called.
this.listing = [];
// A sparse array whose keys correspond to locations in this.listing
this.listing = []; // A sparse array whose keys correspond to locations in this.listing
// that have been marked as branch/jump targets.
this.marked = [true];
// The last location will be marked when this.getDispatchLoop is
this.marked = [true]; // The last location will be marked when this.getDispatchLoop is
// called.
this.finalLoc = loc();
// A list of all leap.TryEntry statements emitted.
this.tryEntries = [];
this.finalLoc = loc(); // A list of all leap.TryEntry statements emitted.
// Each time we evaluate the body of a loop, we tell this.leapManager
this.tryEntries = []; // Each time we evaluate the body of a loop, we tell this.leapManager
// to enter a nested loop context that determines the meaning of break
// and continue statements therein.
this.leapManager = new leap.LeapManager(this);

@@ -69,5 +53,3 @@ }

var Ep = Emitter.prototype;
exports.Emitter = Emitter;
// Offsets into this.listing that could be used as targets for branches or
exports.Emitter = Emitter; // Offsets into this.listing that could be used as targets for branches or
// jumps are represented as numeric Literal nodes. This representation has

@@ -77,11 +59,13 @@ // the amazingly convenient benefit of allowing the exact value of the

// refers to the location.
function loc() {
return util.getTypes().numericLiteral(-1);
}
} // Sets the exact value of the given location to the offset of the next
// Statement emitted.
// Sets the exact value of the given location to the offset of the next
// Statement emitted.
Ep.mark = function (loc) {
util.getTypes().assertLiteral(loc);
var index = this.listing.length;
if (loc.value === -1) {

@@ -92,4 +76,5 @@ loc.value = index;

// once set the first time.
_assert2.default.strictEqual(loc.value, index);
_assert.default.strictEqual(loc.value, index);
}
this.marked[index] = true;

@@ -108,25 +93,25 @@ return loc;

this.listing.push(node);
};
}; // Shorthand for emitting assignment statements. This will come in handy
// for assignments to temporary variables.
// Shorthand for emitting assignment statements. This will come in handy
// for assignments to temporary variables.
Ep.emitAssign = function (lhs, rhs) {
this.emit(this.assign(lhs, rhs));
return lhs;
};
}; // Shorthand for an assignment statement.
// Shorthand for an assignment statement.
Ep.assign = function (lhs, rhs) {
var t = util.getTypes();
return t.expressionStatement(t.assignmentExpression("=", lhs, rhs));
};
}; // Convenience function for generating expressions like context.next,
// context.sent, and context.rval.
// Convenience function for generating expressions like context.next,
// context.sent, and context.rval.
Ep.contextProperty = function (name, computed) {
var t = util.getTypes();
return t.memberExpression(this.contextId, computed ? t.stringLiteral(name) : t.identifier(name), !!computed);
};
}; // Shorthand for setting context.rval and jumping to `context.stop()`.
// Shorthand for setting context.rval and jumping to `context.stop()`.
Ep.stop = function (rval) {

@@ -142,3 +127,2 @@ if (rval) {

util.getTypes().assertExpression(valuePath.value);
this.emitAssign(this.contextProperty("rval"), this.explodeExpression(valuePath));

@@ -149,5 +133,3 @@ };

var t = util.getTypes();
t.assertLiteral(tryLoc);
var catchCall = t.callExpression(this.contextProperty("catch", true), [tryLoc]);

@@ -160,29 +142,26 @@

}
};
}; // Emits code for an unconditional jump to the given location, even if the
// exact value of the location is not yet known.
// Emits code for an unconditional jump to the given location, even if the
// exact value of the location is not yet known.
Ep.jump = function (toLoc) {
this.emitAssign(this.contextProperty("next"), toLoc);
this.emit(util.getTypes().breakStatement());
};
}; // Conditional jump.
// Conditional jump.
Ep.jumpIf = function (test, toLoc) {
var t = util.getTypes();
t.assertExpression(test);
t.assertLiteral(toLoc);
this.emit(t.ifStatement(test, t.blockStatement([this.assign(this.contextProperty("next"), toLoc), t.breakStatement()])));
};
}; // Conditional jump, with the condition negated.
// Conditional jump, with the condition negated.
Ep.jumpIfNot = function (test, toLoc) {
var t = util.getTypes();
t.assertExpression(test);
t.assertLiteral(toLoc);
var negatedTest;
var negatedTest = void 0;
if (t.isUnaryExpression(test) && test.operator === "!") {

@@ -196,5 +175,3 @@ // Avoid double negation.

this.emit(t.ifStatement(negatedTest, t.blockStatement([this.assign(this.contextProperty("next"), toLoc), t.breakStatement()])));
};
// Returns a unique MemberExpression that can be used to store and
}; // Returns a unique MemberExpression that can be used to store and
// retrieve temporary values. Since the object of the member expression is

@@ -204,2 +181,4 @@ // the context object, which is presumed to coexist peacefully with all

// monotonically, uniqueness is assured.
Ep.makeTempVar = function () {

@@ -211,10 +190,8 @@ return this.contextProperty("t" + this.nextTempId++);

var t = util.getTypes();
return t.functionExpression(id || null /*Anonymous*/
return t.functionExpression(id || null
/*Anonymous*/
, [this.contextId], t.blockStatement([this.getDispatchLoop()]), false, // Not a generator anymore!
false // Nor an expression.
);
};
// Turns this.listing into a loop of the form
}; // Turns this.listing into a loop of the form
//

@@ -230,2 +207,4 @@ // while (1) switch (context.next) {

// case statement.
Ep.getDispatchLoop = function () {

@@ -235,8 +214,6 @@ var self = this;

var cases = [];
var current = void 0;
var current; // If we encounter a break, continue, or return statement in a switch
// case, we can skip the rest of the statements until the next case.
// If we encounter a break, continue, or return statement in a switch
// case, we can skip the rest of the statements until the next case.
var alreadyEnded = false;
self.listing.forEach(function (stmt, i) {

@@ -252,18 +229,11 @@ if (self.marked.hasOwnProperty(i)) {

}
});
}); // Now that we know how many statements there will be in this.listing,
// we can finally resolve this.finalLoc.value.
// Now that we know how many statements there will be in this.listing,
// we can finally resolve this.finalLoc.value.
this.finalLoc.value = this.listing.length;
cases.push(t.switchCase(this.finalLoc, [
// Intentionally fall through to the "end" case...
]),
// So that the runtime can jump to the final location without having
cases.push(t.switchCase(this.finalLoc, [// Intentionally fall through to the "end" case...
]), // So that the runtime can jump to the final location without having
// to know its offset, we provide the "end" case as a synonym.
t.switchCase(t.stringLiteral("end"), [
// This will check/clear both context.thrown and context.rval.
t.switchCase(t.stringLiteral("end"), [// This will check/clear both context.thrown and context.rval.
t.returnStatement(t.callExpression(this.contextProperty("stop"), []))]));
return t.whileStatement(t.numericLiteral(1), t.switchStatement(t.assignmentExpression("=", this.contextProperty("prev"), this.contextProperty("next")), cases));

@@ -281,13 +251,11 @@ };

var lastLocValue = 0;
return t.arrayExpression(this.tryEntries.map(function (tryEntry) {
var thisLocValue = tryEntry.firstLoc.value;
_assert2.default.ok(thisLocValue >= lastLocValue, "try entries out of order");
_assert.default.ok(thisLocValue >= lastLocValue, "try entries out of order");
lastLocValue = thisLocValue;
var ce = tryEntry.catchEntry;
var fe = tryEntry.finallyEntry;
var locs = [tryEntry.firstLoc,
// The null here makes a hole in the array.
var locs = [tryEntry.firstLoc, // The null here makes a hole in the array.
ce ? ce.firstLoc : null];

@@ -302,11 +270,8 @@

}));
};
// All side effects must be realized in order.
}; // All side effects must be realized in order.
// If any subexpression harbors a leap, all subexpressions must be
// neutered of side effects.
// No destructive modification of AST nodes.
Ep.explode = function (path, ignoreResult) {

@@ -316,9 +281,5 @@ var t = util.getTypes();

var self = this;
t.assertNode(node);
if (t.isDeclaration(node)) throw getDeclError(node);
if (t.isStatement(node)) return self.explodeStatement(path);
if (t.isExpression(node)) return self.explodeExpression(path, ignoreResult);

@@ -332,5 +293,5 @@

throw getDeclError(node);
// These node types should be handled by their parent nodes
// (ObjectExpression, SwitchStatement, and TryStatement, respectively).
case "Property":

@@ -354,6 +315,3 @@ case "SwitchCase":

var self = this;
var before = void 0,
after = void 0,
head = void 0;
var before, after, head;
t.assertStatement(stmt);

@@ -365,6 +323,6 @@

labelId = null;
}
} // Explode BlockStatement nodes even if they do not contain a yield,
// because we don't want or need the curly braces.
// Explode BlockStatement nodes even if they do not contain a yield,
// because we don't want or need the curly braces.
if (t.isBlockStatement(stmt)) {

@@ -393,5 +351,3 @@ path.get("body").forEach(function (path) {

case "LabeledStatement":
after = loc();
// Did you know you can break from any labeled block statement or
after = loc(); // Did you know you can break from any labeled block statement or
// control structure? Well, you can! Note: when a labeled loop is

@@ -416,8 +372,7 @@ // encountered, the leap.LabeledEntry created here will immediately

// time, so it has no additional runtime cost.
self.leapManager.withEntry(new leap.LabeledEntry(after, stmt.label), function () {
self.explodeStatement(path.get("body"), stmt.label);
});
self.mark(after);
break;

@@ -428,3 +383,2 @@

after = loc();
self.mark(before);

@@ -437,3 +391,2 @@ self.jumpIfNot(self.explodeExpression(path.get("test")), after);

self.mark(after);
break;

@@ -445,3 +398,2 @@

after = loc();
self.mark(first);

@@ -454,3 +406,2 @@ self.leapManager.withEntry(new leap.LoopEntry(after, test, labelId), function () {

self.mark(after);
break;

@@ -473,4 +424,3 @@

self.jumpIfNot(self.explodeExpression(path.get("test")), after);
} else {
// No test means continue unconditionally.
} else {// No test means continue unconditionally.
}

@@ -481,3 +431,2 @@

});
self.mark(update);

@@ -492,5 +441,3 @@

self.jump(head);
self.mark(after);
break;

@@ -504,21 +451,13 @@

after = loc();
var keyIterNextFn = self.makeTempVar();
self.emitAssign(keyIterNextFn, t.callExpression(util.runtimeProperty("keys"), [self.explodeExpression(path.get("right"))]));
self.mark(head);
var keyInfoTmpVar = self.makeTempVar();
self.jumpIf(t.memberExpression(t.assignmentExpression("=", keyInfoTmpVar, t.callExpression(keyIterNextFn, [])), t.identifier("done"), false), after);
self.emitAssign(stmt.left, t.memberExpression(keyInfoTmpVar, t.identifier("value"), false));
self.leapManager.withEntry(new leap.LoopEntry(after, head, labelId), function () {
self.explodeStatement(path.get("body"));
});
self.jump(head);
self.mark(after);
break;

@@ -531,3 +470,2 @@

});
break;

@@ -540,3 +478,2 @@

});
break;

@@ -548,9 +485,7 @@

var disc = self.emitAssign(self.makeTempVar(), self.explodeExpression(path.get("discriminant")));
after = loc();
var defaultLoc = loc();
var condition = defaultLoc;
var caseLocs = [];
var caseLocs = []; // If there are no cases, .cases might be undefined.
// If there are no cases, .cases might be undefined.
var cases = stmt.cases || [];

@@ -572,3 +507,2 @@

self.jump(self.explodeExpression(discriminant));
self.leapManager.withEntry(new leap.SwitchEntry(after), function () {

@@ -578,3 +512,2 @@ path.get("cases").forEach(function (casePath) {

self.mark(caseLocs[i]);
casePath.get("consequent").forEach(function (path) {

@@ -585,7 +518,8 @@ self.explodeStatement(path);

});
self.mark(after);
self.mark(after);
if (defaultLoc.value === -1) {
self.mark(defaultLoc);
_assert2.default.strictEqual(after.value, defaultLoc.value);
_assert.default.strictEqual(after.value, defaultLoc.value);
}

@@ -598,5 +532,3 @@

after = loc();
self.jumpIfNot(self.explodeExpression(path.get("test")), elseLoc || after);
self.explodeStatement(path.get("consequent"));

@@ -611,3 +543,2 @@

self.mark(after);
break;

@@ -620,3 +551,2 @@

});
break;

@@ -629,16 +559,10 @@

after = loc();
var handler = stmt.handler;
var catchLoc = handler && loc();
var catchEntry = catchLoc && new leap.CatchEntry(catchLoc, handler.param);
var finallyLoc = stmt.finalizer && loc();
var finallyEntry = finallyLoc && new leap.FinallyEntry(finallyLoc, after);
var tryEntry = new leap.TryEntry(self.getUnmarkedCurrentLoc(), catchEntry, finallyEntry);
self.tryEntries.push(tryEntry);
self.updateContextPrevLoc(tryEntry.firstLoc);
self.leapManager.withEntry(tryEntry, function () {

@@ -660,7 +584,5 @@ self.explodeStatement(path.get("block"));

self.updateContextPrevLoc(self.mark(catchLoc));
var bodyPath = path.get("handler.body");
var safeParam = self.makeTempVar();
self.clearPendingException(tryEntry.firstLoc, safeParam);
bodyPath.traverse(catchParamVisitor, {

@@ -670,3 +592,2 @@ safeParam: safeParam,

});
self.leapManager.withEntry(catchEntry, function () {

@@ -679,13 +600,9 @@ self.explodeStatement(bodyPath);

self.updateContextPrevLoc(self.mark(finallyLoc));
self.leapManager.withEntry(finallyEntry, function () {
self.explodeStatement(path.get("finalizer"));
});
self.emit(t.returnStatement(t.callExpression(self.contextProperty("finish"), [finallyEntry.firstLoc])));
}
});
self.mark(after);
break;

@@ -695,3 +612,2 @@

self.emit(t.throwStatement(self.explodeExpression(path.get("argument"))));
break;

@@ -710,3 +626,2 @@

},
Scope: function Scope(path, state) {

@@ -723,6 +638,6 @@ if (path.scope.hasOwnBinding(state.catchParamName)) {

if (!isValidCompletion(record)) {
_assert2.default.ok(false, "invalid completion record: " + JSON.stringify(record));
_assert.default.ok(false, "invalid completion record: " + JSON.stringify(record));
}
_assert2.default.notStrictEqual(record.type, "normal", "normal completions are not abrupt");
_assert.default.notStrictEqual(record.type, "normal", "normal completions are not abrupt");

@@ -761,5 +676,3 @@ var t = util.getTypes();

return false;
}
// Not all offsets into emitter.listing are potential jump targets. For
} // Not all offsets into emitter.listing are potential jump targets. For
// example, execution typically falls into the beginning of a try block

@@ -773,7 +686,7 @@ // without jumping directly there. This method returns the current offset

// code shorter.
Ep.getUnmarkedCurrentLoc = function () {
return util.getTypes().numericLiteral(this.listing.length);
};
// The context.prev property takes the value of context.next whenever we
}; // The context.prev property takes the value of context.next whenever we
// evaluate the switch statement discriminant, which is generally good

@@ -788,2 +701,4 @@ // enough for tracking the last location we jumped to, but sometimes

// be costly and verbose to set context.prev before every statement.
Ep.updateContextPrevLoc = function (loc) {

@@ -799,11 +714,11 @@ if (loc) {

// Otherwise assert that the location matches the current offset.
_assert2.default.strictEqual(loc.value, this.listing.length);
_assert.default.strictEqual(loc.value, this.listing.length);
}
} else {
loc = this.getUnmarkedCurrentLoc();
}
// Make sure context.prev is up to date in case we fell into this try
} // Make sure context.prev is up to date in case we fell into this try
// statement without jumping to it. TODO Consider avoiding this
// assignment when we know control must have jumped here.
this.emitAssign(this.contextProperty("prev"), loc);

@@ -815,2 +730,3 @@ };

var expr = path.node;
if (expr) {

@@ -823,7 +739,9 @@ t.assertExpression(expr);

var self = this;
var result = void 0; // Used optionally by several cases below.
var after = void 0;
var result; // Used optionally by several cases below.
var after;
function finish(expr) {
t.assertExpression(expr);
if (ignoreResult) {

@@ -834,17 +752,15 @@ self.emit(expr);

}
}
} // If the expression does not contain a leap, then we either emit the
// expression as a standalone statement or return it whole.
// If the expression does not contain a leap, then we either emit the
// expression as a standalone statement or return it whole.
if (!meta.containsLeap(expr)) {
return finish(expr);
}
// If any child contains a leap (such as a yield or labeled continue or
} // If any child contains a leap (such as a yield or labeled continue or
// break statement), then any sibling subexpressions will almost
// certainly have to be exploded in order to maintain the order of their
// side effects relative to the leaping child(ren).
var hasLeapingChildren = meta.containsLeap.onlyChildren(expr);
// In order to save the rest of explodeExpression from a combinatorial
var hasLeapingChildren = meta.containsLeap.onlyChildren(expr); // In order to save the rest of explodeExpression from a combinatorial
// trainwreck of special cases, explodeViaTempVar is responsible for

@@ -858,10 +774,9 @@ // deciding when a subexpression needs to be "exploded," which is my

// side effects of those subexpressions.
function explodeViaTempVar(tempVar, childPath, ignoreChildResult) {
_assert2.default.ok(!ignoreChildResult || !tempVar, "Ignoring the result of a child expression but forcing it to " + "be assigned to a temporary variable?");
_assert.default.ok(!ignoreChildResult || !tempVar, "Ignoring the result of a child expression but forcing it to " + "be assigned to a temporary variable?");
var result = self.explodeExpression(childPath, ignoreChildResult);
if (ignoreChildResult) {
// Side effects already emitted above.
if (ignoreChildResult) {// Side effects already emitted above.
} else if (tempVar || hasLeapingChildren && !t.isLiteral(result)) {

@@ -881,9 +796,9 @@ // If tempVar was provided, then the result will always be assigned

}
return result;
}
// If ignoreResult is true, then we must take full responsibility for
} // If ignoreResult is true, then we must take full responsibility for
// emitting the expression with all its side effects, and we should not
// return a result.
switch (expr.type) {

@@ -896,6 +811,4 @@ case "MemberExpression":

var argsPath = path.get("arguments");
var newCallee = void 0;
var newCallee;
var newArgs = [];
var hasLeapingArgs = false;

@@ -913,12 +826,7 @@ argsPath.forEach(function (argPath) {

// member expression still gets bound to `this` for the call.
var newObject = explodeViaTempVar(
// Assign the exploded callee.object expression to a temporary
var newObject = explodeViaTempVar( // Assign the exploded callee.object expression to a temporary
// variable so that we can use it twice without reevaluating it.
self.makeTempVar(), calleePath.get("object"));
var newProperty = calleePath.node.computed ? explodeViaTempVar(null, calleePath.get("property")) : calleePath.node.property;
newArgs.unshift(newObject);
newCallee = t.memberExpression(t.memberExpression(newObject, newProperty, calleePath.node.computed), t.identifier("call"), false);

@@ -947,3 +855,2 @@ } else {

});
return finish(t.callExpression(newCallee, newArgs));

@@ -972,3 +879,2 @@

var lastIndex = expr.expressions.length - 1;
path.get("expressions").forEach(function (exprPath) {

@@ -981,3 +887,2 @@ if (exprPath.key === lastIndex) {

});
return result;

@@ -997,3 +902,4 @@

} else {
_assert2.default.strictEqual(expr.operator, "||");
_assert.default.strictEqual(expr.operator, "||");
self.jumpIf(left, after);

@@ -1003,5 +909,3 @@ }

explodeViaTempVar(result, path.get("right"), ignoreResult);
self.mark(after);
return result;

@@ -1013,3 +917,2 @@

var test = self.explodeExpression(path.get("test"));
self.jumpIfNot(test, elseLoc);

@@ -1023,13 +926,9 @@

self.jump(after);
self.mark(elseLoc);
explodeViaTempVar(result, path.get("alternate"), ignoreResult);
self.mark(after);
return result;
case "UnaryExpression":
return finish(t.unaryExpression(expr.operator,
// Can't (and don't need to) break up the syntax of the argument.
return finish(t.unaryExpression(expr.operator, // Can't (and don't need to) break up the syntax of the argument.
// Think about delete a[b].

@@ -1055,7 +954,6 @@ self.explodeExpression(path.get("argument")), !!expr.prefix));

var _ret = t.returnStatement(t.callExpression(self.contextProperty("delegateYield"), [arg, t.stringLiteral(_result.property.name), after]));
_ret.loc = expr.loc;
self.emit(_ret);
self.mark(after);
return _result;

@@ -1065,10 +963,8 @@ }

self.emitAssign(self.contextProperty("next"), after);
var ret = t.returnStatement(arg || null); // Preserve the `yield` location so that source mappings for the statements
// link back to the yield properly.
var ret = t.returnStatement(arg || null);
// Preserve the `yield` location so that source mappings for the statements
// link back to the yield properly.
ret.loc = expr.loc;
self.emit(ret);
self.mark(after);
return self.contextProperty("sent");

@@ -1075,0 +971,0 @@

56

lib/hoist.js
"use strict";
var _util = require("./util");
var util = _interopRequireWildcard(require("./util"));
var util = _interopRequireWildcard(_util);
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
var hasOwn = Object.prototype.hasOwnProperty;
// The hoist function takes a FunctionExpression or FunctionDeclaration
// and replaces any Declaration nodes in its body with assignments, then
// returns a VariableDeclaration containing just the names of the removed
// declarations.
/**

@@ -21,2 +13,6 @@ * Copyright (c) 2014-present, Facebook, Inc.

*/
var hasOwn = Object.prototype.hasOwnProperty; // The hoist function takes a FunctionExpression or FunctionDeclaration
// and replaces any Declaration nodes in its body with assignments, then
// returns a VariableDeclaration containing just the names of the removed
// declarations.

@@ -26,10 +22,8 @@ exports.hoist = function (funPath) {

t.assertFunction(funPath.node);
var vars = {};
function varDeclToExpr(vdec, includeIdentifiers) {
t.assertVariableDeclaration(vdec);
// TODO assert.equal(vdec.kind, "var");
t.assertVariableDeclaration(vdec); // TODO assert.equal(vdec.kind, "var");
var exprs = [];
vdec.declarations.forEach(function (dec) {

@@ -46,7 +40,4 @@ // Note: We duplicate 'dec.id' here to ensure that the variable declaration IDs don't

});
if (exprs.length === 0) return null;
if (exprs.length === 1) return exprs[0];
return t.sequenceExpression(exprs);

@@ -59,2 +50,3 @@ }

var expr = varDeclToExpr(path.node, false);
if (expr === null) {

@@ -66,12 +58,12 @@ path.remove();

util.replaceWithOrRemove(path, t.expressionStatement(expr));
}
} // Since the original node has been either removed or replaced,
// avoid traversing it any further.
// Since the original node has been either removed or replaced,
// avoid traversing it any further.
path.skip();
}
},
ForStatement: function ForStatement(path) {
var init = path.node.init;
if (t.isVariableDeclaration(init)) {

@@ -81,5 +73,5 @@ util.replaceWithOrRemove(path.get("init"), varDeclToExpr(init, false));

},
ForXStatement: function ForXStatement(path) {
var left = path.get("left");
if (left.isVariableDeclaration()) {

@@ -89,7 +81,5 @@ util.replaceWithOrRemove(left, varDeclToExpr(left.node, true));

},
FunctionDeclaration: function FunctionDeclaration(path) {
var node = path.node;
vars[node.id.name] = node.id;
var assignment = t.expressionStatement(t.assignmentExpression("=", node.id, t.functionExpression(path.scope.generateUidIdentifierBasedOnNode(node), node.params, node.body, node.generator, node.expression)));

@@ -100,6 +90,5 @@

// enclosing block.
path.parentPath.unshiftContainer("body", assignment);
path.parentPath.unshiftContainer("body", assignment); // Remove the function declaration now that we've inserted the
// equivalent assignment form at the beginning of the block.
// Remove the function declaration now that we've inserted the
// equivalent assignment form at the beginning of the block.
path.remove();

@@ -111,8 +100,7 @@ } else {

util.replaceWithOrRemove(path, assignment);
}
} // Don't hoist variables out of inner functions.
// Don't hoist variables out of inner functions.
path.skip();
},
FunctionExpression: function FunctionExpression(path) {

@@ -122,3 +110,2 @@ // Don't descend into nested function expressions.

},
ArrowFunctionExpression: function ArrowFunctionExpression(path) {

@@ -129,16 +116,13 @@ // Don't descend into nested function expressions.

});
var paramNames = {};
funPath.get("params").forEach(function (paramPath) {
var param = paramPath.node;
if (t.isIdentifier(param)) {
paramNames[param.name] = param;
} else {
// Variables declared by destructuring parameter patterns will be
} else {// Variables declared by destructuring parameter patterns will be
// harmlessly re-declared.
}
});
var declarations = [];
Object.keys(vars).forEach(function (name) {

@@ -145,0 +129,0 @@ if (!hasOwn.call(paramNames, name)) {

19

lib/index.js
"use strict";
exports.__esModule = true;
exports.default = _default;
exports.default = function (context) {
/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
function _default(context) {
var plugin = {
visitor: require("./visit").getVisitor(context)
};
// Some presets manually call child presets, but fail to pass along the
}; // Some presets manually call child presets, but fail to pass along the
// context object. Out of an abundance of caution, we verify that it
// exists first to avoid causing unnecessary breaking changes.
var version = context && context.version;
// The "name" property is not allowed in older versions of Babel (6.x)
var version = context && context.version; // The "name" property is not allowed in older versions of Babel (6.x)
// and will cause the plugin validator to throw an exception.
if (version && parseInt(version, 10) >= 7) {

@@ -22,2 +27,2 @@ plugin.name = "regenerator-transform";

return plugin;
};
}

54

lib/leap.js
"use strict";
var _assert = require("assert");
var _assert = _interopRequireDefault(require("assert"));
var _assert2 = _interopRequireDefault(_assert);
var _util = require("util");

@@ -13,10 +11,11 @@

/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
function Entry() {
_assert2.default.ok(this instanceof Entry);
} /**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
_assert.default.ok(this instanceof Entry);
}

@@ -34,5 +33,3 @@ function FunctionEntry(returnLoc) {

Entry.call(this);
var t = (0, _util2.getTypes)();
t.assertLiteral(breakLoc);

@@ -66,3 +63,2 @@ t.assertLiteral(continueLoc);

Entry.call(this);
var t = (0, _util2.getTypes)();

@@ -72,3 +68,3 @@ t.assertLiteral(firstLoc);

if (catchEntry) {
_assert2.default.ok(catchEntry instanceof CatchEntry);
_assert.default.ok(catchEntry instanceof CatchEntry);
} else {

@@ -79,10 +75,10 @@ catchEntry = null;

if (finallyEntry) {
_assert2.default.ok(finallyEntry instanceof FinallyEntry);
_assert.default.ok(finallyEntry instanceof FinallyEntry);
} else {
finallyEntry = null;
}
} // Have to have one or the other (or both).
// Have to have one or the other (or both).
_assert2.default.ok(catchEntry || finallyEntry);
_assert.default.ok(catchEntry || finallyEntry);
this.firstLoc = firstLoc;

@@ -98,8 +94,5 @@ this.catchEntry = catchEntry;

Entry.call(this);
var t = (0, _util2.getTypes)();
t.assertLiteral(firstLoc);
t.assertIdentifier(paramId);
this.firstLoc = firstLoc;

@@ -126,8 +119,5 @@ this.paramId = paramId;

Entry.call(this);
var t = (0, _util2.getTypes)();
t.assertLiteral(breakLoc);
t.assertIdentifier(label);
this.breakLoc = breakLoc;

@@ -141,7 +131,8 @@ this.label = label;

function LeapManager(emitter) {
_assert2.default.ok(this instanceof LeapManager);
_assert.default.ok(this instanceof LeapManager);
var Emitter = require("./emit").Emitter;
_assert2.default.ok(emitter instanceof Emitter);
_assert.default.ok(emitter instanceof Emitter);
this.emitter = emitter;

@@ -155,4 +146,6 @@ this.entryStack = [new FunctionEntry(emitter.finalLoc)];

LMp.withEntry = function (entry, callback) {
_assert2.default.ok(entry instanceof Entry);
_assert.default.ok(entry instanceof Entry);
this.entryStack.push(entry);
try {

@@ -162,3 +155,4 @@ callback.call(this.emitter);

var popped = this.entryStack.pop();
_assert2.default.strictEqual(popped, entry);
_assert.default.strictEqual(popped, entry);
}

@@ -171,2 +165,3 @@ };

var loc = entry[property];
if (loc) {

@@ -177,4 +172,3 @@ if (label) {

}
} else if (entry instanceof LabeledEntry) {
// Ignore LabeledEntry entries unless we are actually breaking to
} else if (entry instanceof LabeledEntry) {// Ignore LabeledEntry entries unless we are actually breaking to
// a label.

@@ -181,0 +175,0 @@ } else {

56

lib/meta.js
"use strict";
var _assert = require("assert");
var _assert = _interopRequireDefault(require("assert"));
var _assert2 = _interopRequireDefault(_assert);
var _util = require("./util.js");

@@ -17,4 +15,4 @@

*/
var m = require("private").makeAccessor();
var m = require("private").makeAccessor();
var hasOwn = Object.prototype.hasOwnProperty;

@@ -25,16 +23,16 @@

var t = (0, _util.getTypes)();
t.assertNode(node);
t.assertNode(node); // Assume no side effects until we find out otherwise.
// Assume no side effects until we find out otherwise.
var result = false;
function check(child) {
if (result) {
// Do nothing.
if (result) {// Do nothing.
} else if (Array.isArray(child)) {
child.some(check);
} else if (t.isNode(child)) {
_assert2.default.strictEqual(result, false);
_assert.default.strictEqual(result, false);
result = predicate(child);
}
return result;

@@ -44,2 +42,3 @@ }

var keys = t.VISITOR_KEYS[node.type];
if (keys) {

@@ -58,12 +57,8 @@ for (var i = 0; i < keys.length; i++) {

(0, _util.getTypes)().assertNode(node);
var meta = m(node);
if (hasOwn.call(meta, propertyName)) return meta[propertyName];
if (hasOwn.call(meta, propertyName)) return meta[propertyName]; // Certain types are "opaque," which means they have no side
// effects or leaps and we don't care about their subexpressions.
// Certain types are "opaque," which means they have no side
// effects or leaps and we don't care about their subexpressions.
if (hasOwn.call(opaqueTypes, node.type)) return meta[propertyName] = false;
if (hasOwn.call(knownTypes, node.type)) return meta[propertyName] = true;
return meta[propertyName] = onlyChildren(node);

@@ -73,3 +68,2 @@ }

predicate.onlyChildren = onlyChildren;
return predicate;

@@ -81,17 +75,22 @@ }

ArrowFunctionExpression: true
};
}; // These types potentially have side effects regardless of what side
// effects their subexpressions have.
// These types potentially have side effects regardless of what side
// effects their subexpressions have.
var sideEffectTypes = {
CallExpression: true, // Anything could happen!
ForInStatement: true, // Modifies the key variable.
UnaryExpression: true, // Think delete.
BinaryExpression: true, // Might invoke .toString() or .valueOf().
AssignmentExpression: true, // Side-effecting by definition.
UpdateExpression: true, // Updates are essentially assignments.
CallExpression: true,
// Anything could happen!
ForInStatement: true,
// Modifies the key variable.
UnaryExpression: true,
// Think delete.
BinaryExpression: true,
// Might invoke .toString() or .valueOf().
AssignmentExpression: true,
// Side-effecting by definition.
UpdateExpression: true,
// Updates are essentially assignments.
NewExpression: true // Similar to CallExpression.
};
// These types are the direct cause of all leaps in control flow.
}; // These types are the direct cause of all leaps in control flow.
var leapTypes = {

@@ -103,5 +102,4 @@ YieldExpression: true,

ThrowStatement: true
};
}; // All leap types are also side effect types.
// All leap types are also side effect types.
for (var type in leapTypes) {

@@ -108,0 +106,0 @@ if (hasOwn.call(leapTypes, type)) {

36

lib/replaceShorthandObjectMethod.js

@@ -6,8 +6,12 @@ "use strict";

var _util = require("./util");
var util = _interopRequireWildcard(require("./util"));
var util = _interopRequireWildcard(_util);
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// this function converts a shorthand object generator method into a normal

@@ -46,11 +50,11 @@ // (non-shorthand) object property which is a generator function expression. for

throw new Error("replaceShorthandObjectMethod can only be called on Function AST node paths.");
}
} // this function only replaces shorthand object methods (called ObjectMethod
// in Babel-speak).
// this function only replaces shorthand object methods (called ObjectMethod
// in Babel-speak).
if (!t.isObjectMethod(path.node)) {
return path;
}
} // this function only replaces generators.
// this function only replaces generators.
if (!path.node.generator) {

@@ -63,3 +67,2 @@ return path;

});
var functionExpression = t.functionExpression(null, // id

@@ -69,3 +72,2 @@ parameters, // params

path.node.generator, path.node.async);
util.replaceWithOrRemove(path, t.objectProperty(t.cloneDeep(path.node.key), // key

@@ -75,14 +77,8 @@ functionExpression, //value

false // shorthand
));
// path now refers to the ObjectProperty AST node path, but we want to return a
)); // path now refers to the ObjectProperty AST node path, but we want to return a
// Function AST node path for the function expression we created. we know that
// the FunctionExpression we just created is the value of the ObjectProperty,
// so return the "value" path off of this path.
return path.get("value");
} /**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
}

9

lib/util.js

@@ -9,2 +9,3 @@ "use strict";

exports.replaceWithOrRemove = replaceWithOrRemove;
/**

@@ -16,3 +17,2 @@ * Copyright (c) 2014-present, Facebook, Inc.

*/
var currentTypes = null;

@@ -24,4 +24,5 @@

currentTypes = types;
try {
for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];

@@ -47,3 +48,5 @@ }

function isReference(path) {
return path.isReferenced() || path.parentPath.isAssignmentExpression({ left: path.node });
return path.isReferenced() || path.parentPath.isAssignmentExpression({
left: path.node
});
}

@@ -50,0 +53,0 @@

95

lib/visit.js

@@ -7,9 +7,6 @@ /**

*/
"use strict";
var _assert = require("assert");
var _assert = _interopRequireDefault(require("assert"));
var _assert2 = _interopRequireDefault(_assert);
var _hoist = require("./hoist");

@@ -19,12 +16,8 @@

var _replaceShorthandObjectMethod = require("./replaceShorthandObjectMethod");
var _replaceShorthandObjectMethod = _interopRequireDefault(require("./replaceShorthandObjectMethod"));
var _replaceShorthandObjectMethod2 = _interopRequireDefault(_replaceShorthandObjectMethod);
var util = _interopRequireWildcard(require("./util"));
var _util = require("./util");
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
var util = _interopRequireWildcard(_util);
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

@@ -53,11 +46,9 @@

return;
}
} // if this is an ObjectMethod, we need to convert it to an ObjectProperty
// if this is an ObjectMethod, we need to convert it to an ObjectProperty
path = (0, _replaceShorthandObjectMethod2.default)(path);
path = (0, _replaceShorthandObjectMethod.default)(path);
node = path.node;
var contextId = path.scope.generateUidIdentifier("context");
var argsId = path.scope.generateUidIdentifier("args");
path.ensureBlock();

@@ -73,8 +64,7 @@ var bodyBlockPath = path.get("body");

});
var outerBody = [];
var innerBody = [];
bodyBlockPath.get("body").forEach(function (childPath) {
var node = childPath.node;
if (t.isExpressionStatement(node) && t.isStringLiteral(node.expression)) {

@@ -100,18 +90,17 @@ // Babylon represents directives like "use strict" as elements

var outerFnExpr = getOuterFnExpr(path);
// Note that getOuterFnExpr has the side-effect of ensuring that the
var outerFnExpr = getOuterFnExpr(path); // Note that getOuterFnExpr has the side-effect of ensuring that the
// function has a name (so node.id will always be an Identifier), even
// if a temporary name has to be synthesized.
t.assertIdentifier(node.id);
var innerFnId = t.identifier(node.id.name + "$");
var innerFnId = t.identifier(node.id.name + "$"); // Turn all declarations into vars, and replace the original
// declarations with equivalent assignment expressions.
// Turn all declarations into vars, and replace the original
// declarations with equivalent assignment expressions.
var vars = (0, _hoist.hoist)(path);
var didRenameArguments = renameArguments(path, argsId);
var didRenameArguments = renameArguments(path, argsId);
if (didRenameArguments) {
vars = vars || t.variableDeclaration("var", []);
var argumentIdentifier = t.identifier("arguments");
// we need to do this as otherwise arguments in arrow functions gets hoisted
var argumentIdentifier = t.identifier("arguments"); // we need to do this as otherwise arguments in arrow functions gets hoisted
argumentIdentifier._shadowedFunctionLiteral = path;

@@ -128,9 +117,8 @@ vars.declarations.push(t.variableDeclarator(argsId, argumentIdentifier));

var wrapArgs = [emitter.getContextFunction(innerFnId),
// Async functions that are not generators don't care about the
var wrapArgs = [emitter.getContextFunction(innerFnId), // Async functions that are not generators don't care about the
// outer function because they don't need it to be marked and don't
// inherit from its .prototype.
node.generator ? outerFnExpr : t.nullLiteral(), t.thisExpression()];
var tryLocsList = emitter.getTryLocsList();
var tryLocsList = emitter.getTryLocsList();
if (tryLocsList) {

@@ -141,7 +129,6 @@ wrapArgs.push(tryLocsList);

var wrapCall = t.callExpression(util.runtimeProperty(node.async ? "async" : "wrap"), wrapArgs);
outerBody.push(t.returnStatement(wrapCall));
node.body = t.blockStatement(outerBody);
var oldDirectives = bodyBlockPath.node.directives;
var oldDirectives = bodyBlockPath.node.directives;
if (oldDirectives) {

@@ -154,2 +141,3 @@ // Babylon represents directives like "use strict" as elements of

var wasGeneratorFunction = node.generator;
if (wasGeneratorFunction) {

@@ -166,7 +154,7 @@ node.generator = false;

path.addComment("leading", "#__PURE__");
}
// Generators are processed in 'exit' handlers so that regenerator only has to run on
} // Generators are processed in 'exit' handlers so that regenerator only has to run on
// an ES5 AST, but that means traversal will not pick up newly inserted references
// to things like 'regeneratorRuntime'. To avoid this, we explicitly requeue.
path.requeue();

@@ -176,8 +164,8 @@ })

};
};
// Given a NodePath for a Function, return an Expression node that can be
}; // Given a NodePath for a Function, return an Expression node that can be
// used to refer reliably to the function object from inside the function.
// This expression is essentially a replacement for arguments.callee, with
// the key advantage that it works in strict mode.
function getOuterFnExpr(funPath) {

@@ -209,3 +197,2 @@ var t = util.getTypes();

t.assertIdentifier(node.id);
var blockPath = funPath.findParent(function (path) {

@@ -220,5 +207,7 @@ return path.isProgram() || path.isBlockStatement();

var block = blockPath.node;
_assert2.default.ok(Array.isArray(block.body));
_assert.default.ok(Array.isArray(block.body));
var info = getMarkInfo(block);
if (!info.decl) {

@@ -230,16 +219,13 @@ info.decl = t.variableDeclaration("var", []);

_assert2.default.strictEqual(info.declPath.node, info.decl);
_assert.default.strictEqual(info.declPath.node, info.decl); // Get a new unique identifier for our marked variable.
// Get a new unique identifier for our marked variable.
var markedId = blockPath.scope.generateUidIdentifier("marked");
var markCallExp = t.callExpression(util.runtimeProperty("mark"), [node.id]);
var index = info.decl.declarations.push(t.variableDeclarator(markedId, markCallExp)) - 1;
var markCallExpPath = info.declPath.get("declarations." + index + ".init");
_assert2.default.strictEqual(markCallExpPath.node, markCallExp);
_assert.default.strictEqual(markCallExpPath.node, markCallExp);
markCallExpPath.addComment("leading", "#__PURE__");
return markedId;

@@ -253,9 +239,7 @@ }

};
funcPath.traverse(argumentsVisitor, state);
// If the traversal replaced any arguments references, then we need to
funcPath.traverse(argumentsVisitor, state); // If the traversal replaced any arguments references, then we need to
// alias the outer function's arguments binding (be it the implicit
// arguments object or some other parameter or variable) to the variable
// named by argsId.
return state.didRenameArguments;

@@ -268,3 +252,2 @@ }

},
Identifier: function Identifier(path, state) {

@@ -277,3 +260,2 @@ if (path.node.name === "arguments" && util.isReference(path)) {

};
var functionSentVisitor = {

@@ -283,3 +265,2 @@ MetaProperty: function MetaProperty(path) {

if (node.meta.name === "function" && node.property.name === "sent") {

@@ -291,3 +272,2 @@ var t = util.getTypes();

};
var awaitVisitor = {

@@ -297,14 +277,11 @@ Function: function Function(path) {

},
AwaitExpression: function AwaitExpression(path) {
var t = util.getTypes();
var t = util.getTypes(); // Convert await expressions to yield expressions.
// Convert await expressions to yield expressions.
var argument = path.node.argument;
// Transforming `await x` to `yield regeneratorRuntime.awrap(x)`
var argument = path.node.argument; // Transforming `await x` to `yield regeneratorRuntime.awrap(x)`
// causes the argument to be wrapped in such a way that the runtime
// can distinguish between awaited and merely yielded values.
util.replaceWithOrRemove(path, t.yieldExpression(t.callExpression(util.runtimeProperty("awrap"), [argument]), false));
}
};

8

package.json

@@ -5,3 +5,3 @@ {

"description": "Explode async and generator functions into a state machine.",
"version": "0.12.4",
"version": "0.13.0",
"main": "lib/index.js",

@@ -25,3 +25,3 @@ "keywords": [

[
"env",
"@babel/preset-env",
{

@@ -37,5 +37,5 @@ "loose": true

"devDependencies": {
"babel-cli": "^6.9.0",
"babel-preset-env": "^1.2.2"
"@babel/cli": "^7.0.0-beta.51",
"@babel/preset-env": "^7.0.0-beta.51"
}
}

2

README.md

@@ -43,5 +43,5 @@ # regenerator-transform

```javascript
require("babel-core").transform("code", {
require("@babel/core").transformSync("code", {
plugins: ["regenerator-transform"]
});
```
lib/visit.js~
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