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141
| var esutils = require("esutils");
var _ = require("lodash");
var t = exports;
var addAssert = function (type, is) {
t["assert" + type] = function (node, opts) {
opts = opts || {};
Iif (!is(node, opts)) {
throw new Error("Expected type " + JSON.stringify(type) + " with option " + JSON.stringify(opts));
}
};
};
//
t.VISITOR_KEYS = require("./visitor-keys");
_.each(t.VISITOR_KEYS, function (keys, type) {
var is = t["is" + type] = function (node, opts) {
return node && node.type === type && t.shallowEqual(node, opts);
};
addAssert(type, is);
});
//
t.BUILDER_KEYS = _.defaults(require("./builder-keys"), t.VISITOR_KEYS);
_.each(t.BUILDER_KEYS, function (keys, type) {
t[type[0].toLowerCase() + type.slice(1)] = function () {
var args = arguments;
var node = { type: type };
_.each(keys, function (key, i) {
node[key] = args[i];
});
return node;
};
});
//
t.ALIAS_KEYS = require("./alias-keys");
var _aliases = {};
_.each(t.ALIAS_KEYS, function (aliases, type) {
_.each(aliases, function (alias) {
var types = _aliases[alias] = _aliases[alias] || [];
types.push(type);
});
});
_.each(_aliases, function (types, type) {
t[type.toUpperCase() + "_TYPES"] = types;
var is = t["is" + type] = function (node, opts) {
return node && _.contains(types, node.type) && t.shallowEqual(node, opts);
};
addAssert(type, is);
});
//
t.isExpression = function (node) {
return !t.isStatement(node);
};
addAssert("Expression", t.isExpression);
//
t.toSequenceExpression = function (nodes, scope) {
var exprs = [];
_.each(nodes, function (node) {
if (t.isExpression(node)) {
exprs.push(node);
} if (t.isExpressionStatement(node)) {
exprs.push(node.expression);
} else if (t.isVariableDeclaration(node)) {
_.each(node.declarations, function (declar) {
scope.push({
kind: node.kind,
key: declar.id.name,
id: declar.id
});
exprs.push(t.assignmentExpression("=", declar.id, declar.init));
});
}
});
return t.sequenceExpression(exprs);
};
//
t.shallowEqual = function (actual, expected) {
var same = true;
if (expected) {
_.each(expected, function (val, key) {
if (actual[key] !== val) {
return same = false;
}
});
}
return same;
};
//
t.isDynamic = function (node) {
Iif (t.isParenthesizedExpression(node)) {
return t.isDynamic(node.expression);
} else if (t.isIdentifier(node) || t.isLiteral(node) || t.isThisExpression(node)) {
return false;
} else if (t.isMemberExpression(node)) {
return t.isDynamic(node.object) || t.isDynamic(node.property);
} else {
return true;
}
};
t.isReferenced = function (node, parent) {
// we're a property key so we aren't referenced
if (t.isProperty(parent) && parent.key === node) return false;
// we're a variable declarator id so we aren't referenced
if (t.isVariableDeclarator(parent) && parent.id === node) return false;
var isMemberExpression = t.isMemberExpression(parent);
// we're in a member expression and we're the computed property so we're referenced
var isComputedProperty = isMemberExpression && parent.property === node && parent.computed;
// we're in a member expression and we're the object so we're referenced
var isObject = isMemberExpression && parent.object === node;
// we are referenced
if (!isMemberExpression || isComputedProperty || isObject) return true;
return false;
};
t.toIdentifier = function (name) {
if (t.isIdentifier(name)) return name.name;
// replace all non-valid identifiers with dashes
name = name.replace(/[^a-zA-Z0-9]/g, "-");
// remove all dashes and numbers from start of name
name = name.replace(/^[-0-9]+/, "");
// camel case
name = name.replace(/[-_\s]+(.)?/g, function (match, c) {
return c ? c.toUpperCase() : "";
});
return name;
};
t.isValidIdentifier = function (name) {
return _.isString(name) && esutils.keyword.isIdentifierName(name) && !esutils.keyword.isKeywordES6(name, true);
};
t.ensureBlock = function (node) {
node.body = t.toBlock(node.body, node);
};
t.toStatement = function (node, ignore) {
if (t.isStatement(node)) {
return node;
}
var mustHaveId = false;
var newType;
if (t.isClass(node)) {
mustHaveId = true;
newType = "ClassDeclaration";
} else if (t.isFunction(node)) {
mustHaveId = true;
newType = "FunctionDeclaration";
}
if (mustHaveId && !node.id) {
newType = false;
}
if (!newType) {
Eif (ignore) {
return false;
} else {
throw new Error("cannot turn " + node.type + " to a statement");
}
}
node.type = newType;
return node;
};
t.toBlock = function (node, parent) {
if (t.isBlockStatement(node)) {
return node;
}
Eif (!_.isArray(node)) {
if (!t.isStatement(node)) {
Eif (t.isFunction(parent)) {
node = t.returnStatement(node);
} else {
node = t.expressionStatement(node);
}
}
node = [node];
}
return t.blockStatement(node);
};
t.getIds = function (node, map, ignoreTypes) {
ignoreTypes = ignoreTypes || [];
var search = [].concat(node);
var ids = {};
while (search.length) {
var id = search.shift();
if (!id) continue;
if (_.contains(ignoreTypes, id.type)) continue;
var nodeKey = t.getIds.nodes[id.type];
var arrKey = t.getIds.arrays[id.type];
if (t.isIdentifier(id)) {
ids[id.name] = id;
} else if (nodeKey) {
Eif (id[nodeKey]) search.push(id[nodeKey]);
} else if (arrKey) {
search = search.concat(id[arrKey] || []);
}
}
if (!map) ids = _.keys(ids);
return ids;
};
t.getIds.nodes = {
AssignmentExpression: "left",
ImportSpecifier: "id",
ExportSpecifier: "id",
VariableDeclarator: "id",
FunctionDeclaration: "id",
ClassDeclaration: "id",
ParenthesizedExpression: "expression",
MemeberExpression: "object",
SpreadElement: "argument",
Property: "value"
};
t.getIds.arrays = {
ExportDeclaration: "specifiers",
ImportDeclaration: "specifiers",
VariableDeclaration: "declarations",
ArrayPattern: "elements",
ObjectPattern: "properties"
};
t.isLet = function (node) {
return t.isVariableDeclaration(node) && (node.kind !== "var" || node._let);
};
t.isVar = function (node) {
return t.isVariableDeclaration(node, { kind: "var" }) && !node._let;
};
t.removeComments = function (child) {
delete child.leadingComments;
delete child.trailingComments;
return child;
};
t.inheritsComments = function (child, parent) {
child.leadingComments = _.compact([].concat(child.leadingComments, parent.leadingComments));
child.trailingComments = _.compact([].concat(child.trailingComments, parent.trailingComments));
return child;
};
t.removeComments = function (node) {
delete node.leadingComments;
delete node.trailingComments;
};
t.inherits = function (child, parent) {
child.loc = parent.loc;
child.end = parent.end;
child.range = parent.range;
child.start = parent.start;
t.inheritsComments(child, parent);
return child;
};
t.getSpecifierName = function (specifier) {
return specifier.name || specifier.id;
};
|