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185 lines
5.2 KiB
JavaScript

"use strict";
exports.__esModule = true;
var _getIterator2 = require("babel-runtime/core-js/get-iterator");
var _getIterator3 = _interopRequireDefault(_getIterator2);
exports.default = function (node) {
if (!this.isReferenced()) return;
var binding = this.scope.getBinding(node.name);
if (binding) {
if (binding.identifier.typeAnnotation) {
return binding.identifier.typeAnnotation;
} else {
return getTypeAnnotationBindingConstantViolations(this, node.name);
}
}
if (node.name === "undefined") {
return t.voidTypeAnnotation();
} else if (node.name === "NaN" || node.name === "Infinity") {
return t.numberTypeAnnotation();
} else if (node.name === "arguments") {}
};
var _babelTypes = require("babel-types");
var t = _interopRequireWildcard(_babelTypes);
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 }; }
function getTypeAnnotationBindingConstantViolations(path, name) {
var binding = path.scope.getBinding(name);
var types = [];
path.typeAnnotation = t.unionTypeAnnotation(types);
var functionConstantViolations = [];
var constantViolations = getConstantViolationsBefore(binding, path, functionConstantViolations);
var testType = getConditionalAnnotation(path, name);
if (testType) {
var testConstantViolations = getConstantViolationsBefore(binding, testType.ifStatement);
constantViolations = constantViolations.filter(function (path) {
return testConstantViolations.indexOf(path) < 0;
});
types.push(testType.typeAnnotation);
}
if (constantViolations.length) {
constantViolations = constantViolations.concat(functionConstantViolations);
for (var _iterator = constantViolations, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : (0, _getIterator3.default)(_iterator);;) {
var _ref;
if (_isArray) {
if (_i >= _iterator.length) break;
_ref = _iterator[_i++];
} else {
_i = _iterator.next();
if (_i.done) break;
_ref = _i.value;
}
var violation = _ref;
types.push(violation.getTypeAnnotation());
}
}
if (types.length) {
return t.createUnionTypeAnnotation(types);
}
}
function getConstantViolationsBefore(binding, path, functions) {
var violations = binding.constantViolations.slice();
violations.unshift(binding.path);
return violations.filter(function (violation) {
violation = violation.resolve();
var status = violation._guessExecutionStatusRelativeTo(path);
if (functions && status === "function") functions.push(violation);
return status === "before";
});
}
function inferAnnotationFromBinaryExpression(name, path) {
var operator = path.node.operator;
var right = path.get("right").resolve();
var left = path.get("left").resolve();
var target = void 0;
if (left.isIdentifier({ name: name })) {
target = right;
} else if (right.isIdentifier({ name: name })) {
target = left;
}
if (target) {
if (operator === "===") {
return target.getTypeAnnotation();
} else if (t.BOOLEAN_NUMBER_BINARY_OPERATORS.indexOf(operator) >= 0) {
return t.numberTypeAnnotation();
} else {
return;
}
} else {
if (operator !== "===") return;
}
var typeofPath = void 0;
var typePath = void 0;
if (left.isUnaryExpression({ operator: "typeof" })) {
typeofPath = left;
typePath = right;
} else if (right.isUnaryExpression({ operator: "typeof" })) {
typeofPath = right;
typePath = left;
}
if (!typePath && !typeofPath) return;
typePath = typePath.resolve();
if (!typePath.isLiteral()) return;
var typeValue = typePath.node.value;
if (typeof typeValue !== "string") return;
if (!typeofPath.get("argument").isIdentifier({ name: name })) return;
return t.createTypeAnnotationBasedOnTypeof(typePath.node.value);
}
function getParentConditionalPath(path) {
var parentPath = void 0;
while (parentPath = path.parentPath) {
if (parentPath.isIfStatement() || parentPath.isConditionalExpression()) {
if (path.key === "test") {
return;
} else {
return parentPath;
}
} else {
path = parentPath;
}
}
}
function getConditionalAnnotation(path, name) {
var ifStatement = getParentConditionalPath(path);
if (!ifStatement) return;
var test = ifStatement.get("test");
var paths = [test];
var types = [];
do {
var _path = paths.shift().resolve();
if (_path.isLogicalExpression()) {
paths.push(_path.get("left"));
paths.push(_path.get("right"));
}
if (_path.isBinaryExpression()) {
var type = inferAnnotationFromBinaryExpression(name, _path);
if (type) types.push(type);
}
} while (paths.length);
if (types.length) {
return {
typeAnnotation: t.createUnionTypeAnnotation(types),
ifStatement: ifStatement
};
} else {
return getConditionalAnnotation(ifStatement, name);
}
}
module.exports = exports["default"];