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| var util = require("../util");
var b = require("recast").types.builders;
var _ = require("lodash");
var buildVariableAssign = function (kind, id, init) {
if (kind === false) {
return b.expressionStatement(b.assignmentExpression("=", id, init));
} else {
return b.variableDeclaration(kind, [
b.variableDeclarator(id, init)
]);
}
};
var push = function (kind, nodes, pattern, parentId) {
if (pattern.type === "ObjectPattern") {
pushObjectPattern(kind, nodes, pattern, parentId);
} else Eif (pattern.type === "ArrayPattern") {
pushArrayPattern(kind, nodes, pattern, parentId);
}
};
var pushObjectPattern = function (kind, nodes, pattern, parentId) {
_.each(pattern.properties, function (prop) {
var pattern2 = prop.value;
var patternId2 = b.memberExpression(parentId, prop.key, false);
if (util.isPattern(pattern2)) {
push(kind, nodes, pattern2, patternId2);
} else {
nodes.push(buildVariableAssign(kind, pattern2, patternId2));
}
});
};
var pushArrayPattern = function (kind, nodes, pattern, parentId) {
_.each(pattern.elements, function (elem, i) {
Iif (!elem) return;
var newPatternId = b.memberExpression(parentId, b.literal(i), true);
if (elem.type === "Identifier") {
nodes.push(buildVariableAssign(kind, elem, newPatternId));
} else {
push(kind, nodes, elem, newPatternId);
}
});
};
var pushPattern = function (kind, nodes, pattern, parentId, file) {
if (parentId.type !== "MemberExpression" && parentId.type !== "Identifier") {
var key = b.identifier(file.generateUid("ref"));
nodes.push(b.variableDeclaration("var", [
b.variableDeclarator(key, parentId)
]));
parentId = key;
}
push(kind, nodes, pattern, parentId);
};
exports.ForInStatement =
exports.ForOfStatement = function (node, parent, file) {
var declar = node.left;
if (declar.type !== "VariableDeclaration") return;
var pattern = declar.declarations[0].id;
if (!util.isPattern(pattern)) return;
var key = b.identifier(file.generateUid("ref"));
node.left = b.variableDeclaration(declar.kind, [
b.variableDeclarator(key, null)
]);
var nodes = [];
push(declar.kind, nodes, pattern, key);
util.ensureBlock(node);
var block = node.body;
block.body = nodes.concat(block.body);
};
exports.Function = function (node, parent, file) {
var block = node.body;
var nodes = [];
var hasDestructuring = false;
node.params = node.params.map(function (pattern) {
if (!util.isPattern(pattern)) return pattern;
hasDestructuring = true;
var parentId = b.identifier(file.generateUid("ref"));
pushPattern("var", nodes, pattern, parentId, file);
return parentId;
});
if (!hasDestructuring) return;
util.ensureBlock(node);
block.body = nodes.concat(block.body || []);
};
exports.ExpressionStatement = function (node, parent, file) {
var expr = node.expression;
if (expr.type !== "AssignmentExpression") return;
if (!util.isPattern(expr.left)) return;
var nodes = [];
var ref = b.identifier(file.generateUid("ref"));
nodes.push(b.variableDeclaration("var", [
b.variableDeclarator(ref, expr.right)
]));
push(false, nodes, expr.left, ref);
return nodes;
};
exports.VariableDeclaration = function (node, parent, file) {
if (parent.type === "ForInStatement") return;
var nodes = [];
var hasPattern = false;
_.each(node.declarations, function (declar) {
if (util.isPattern(declar.id)) {
hasPattern = true;
return false;
}
});
if (!hasPattern) return;
_.each(node.declarations, function (declar) {
var patternId = declar.init;
var pattern = declar.id;
if (util.isPattern(pattern) && patternId) {
pushPattern(node.kind, nodes, pattern, patternId, file);
} else {
nodes.push(buildVariableAssign(node.kind, declar.id, declar.init));
}
});
return nodes;
};
|