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| var t = require("../../types");
var _ = require("lodash");
var buildVariableAssign = function (kind, id, init) {
if (kind === false) {
return t.expressionStatement(t.assignmentExpression("=", id, init));
} else {
return t.variableDeclaration(kind, [
t.variableDeclarator(id, init)
]);
}
};
var push = function (kind, nodes, elem, parentId) {
if (t.isObjectPattern(elem)) {
pushObjectPattern(kind, nodes, elem, parentId);
} else if (t.isArrayPattern(elem)) {
pushArrayPattern(kind, nodes, elem, parentId);
} else if (t.isMemberExpression(elem)) {
nodes.push(buildVariableAssign(false, elem, parentId));
} else {
nodes.push(buildVariableAssign(kind, elem, parentId));
}
};
var pushObjectPattern = function (kind, nodes, pattern, parentId) {
_.each(pattern.properties, function (prop) {
var pattern2 = prop.value;
var patternId2 = t.memberExpression(parentId, prop.key);
if (t.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) {
if (!elem) return;
var newPatternId;
if (t.isSpreadElement(elem)) {
newPatternId = t.callExpression(t.memberExpression(parentId, t.identifier("slice")), [t.literal(i)]);
elem = elem.argument;
} else {
newPatternId = t.memberExpression(parentId, t.literal(i), true);
}
push(kind, nodes, elem, newPatternId);
});
};
var pushPattern = function (opts) {
var kind = opts.kind;
var nodes = opts.nodes;
var pattern = opts.pattern;
var parentId = opts.id;
var file = opts.file;
var scope = opts.scope;
if (!t.isMemberExpression(parentId) && !t.isIdentifier(parentId)) {
var key = t.identifier(file.generateUid("ref", scope));
nodes.push(t.variableDeclaration("var", [
t.variableDeclarator(key, parentId)
]));
parentId = key;
}
push(kind, nodes, pattern, parentId);
};
exports.ForInStatement =
exports.ForOfStatement = function (node, parent, file, scope) {
var declar = node.left;
if (!t.isVariableDeclaration(declar)) return;
var pattern = declar.declarations[0].id;
if (!t.isPattern(pattern)) return;
var key = t.identifier(file.generateUid("ref", scope));
node.left = t.variableDeclaration(declar.kind, [
t.variableDeclarator(key, null)
]);
var nodes = [];
push(declar.kind, nodes, pattern, key);
t.ensureBlock(node);
var block = node.body;
block.body = nodes.concat(block.body);
};
exports.Function = function (node, parent, file, scope) {
var nodes = [];
var hasDestructuring = false;
node.params = node.params.map(function (pattern) {
if (!t.isPattern(pattern)) return pattern;
hasDestructuring = true;
var parentId = t.identifier(file.generateUid("ref", scope));
pushPattern({
kind: "var",
nodes: nodes,
pattern: pattern,
id: parentId,
file: file,
scope: scope
});
return parentId;
});
if (!hasDestructuring) return;
t.ensureBlock(node);
var block = node.body;
block.body = nodes.concat(block.body);
};
exports.ExpressionStatement = function (node, parent, file, scope) {
var expr = node.expression;
if (expr.type !== "AssignmentExpression") return;
if (!t.isPattern(expr.left)) return;
var nodes = [];
var ref = t.identifier(file.generateUid("ref", scope));
nodes.push(t.variableDeclaration("var", [
t.variableDeclarator(ref, expr.right)
]));
push(false, nodes, expr.left, ref);
return nodes;
};
exports.VariableDeclaration = function (node, parent, file, scope) {
if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return;
var nodes = [];
var hasPattern = false;
_.each(node.declarations, function (declar) {
if (t.isPattern(declar.id)) {
hasPattern = true;
return false;
}
});
if (!hasPattern) return;
_.each(node.declarations, function (declar) {
var patternId = declar.init;
var pattern = declar.id;
if (t.isPattern(pattern) && patternId) {
pushPattern({
kind: node.kind,
nodes: nodes,
pattern: pattern,
id: patternId,
file: file,
scope: scope
});
} else {
nodes.push(buildVariableAssign(node.kind, declar.id, declar.init));
}
});
Iif (!t.isProgram(parent) && !t.isBlockStatement(parent)) {
var declar;
_.each(nodes, function (node) {
declar = declar || t.variableDeclaration(node.kind, []);
if (!t.isVariableDeclaration(node) && declar.kind !== node.kind) {
throw file.errorWithNode(node, "Cannot use this node within the current parent");
}
declar.declarations = declar.declarations.concat(node.declarations);
});
return declar;
}
return nodes;
};
|