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// AST walker module for Mozilla Parser API compatible trees
// A simple walk is one where you simply specify callbacks to be
// called on specific nodes. The last two arguments are optional. A
// simple use would be
//
// walk.simple(myTree, {
// Expression: function(node) { ... }
// });
//
// to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression and
// Statement, which denote categories of nodes.
//
// The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial
// state.
function simple(node, visitors, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
baseVisitor[type](node, st, c);
if (found) { found(node, st); }
})(node, state, override);
}
// An ancestor walk keeps an array of ancestor nodes (including the
// current node) and passes them to the callback as third parameter
// (and also as state parameter when no other state is present).
function ancestor(node, visitors, baseVisitor, state, override) {
var ancestors = [];
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type, found = visitors[type];
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (found) { found(node, st || ancestors, ancestors); }
if (isNew) { ancestors.pop(); }
})(node, state, override);
}
// A recursive walk is one where your functions override the default
// walkers. They can modify and replace the state parameter that's
// threaded through the walk, and can opt how and whether to walk
// their child nodes (by calling their third argument on these
// nodes).
function recursive(node, state, funcs, baseVisitor, override) {
var visitor = funcs ? make(funcs, baseVisitor || undefined) : baseVisitor
;(function c(node, st, override) {
visitor[override || node.type](node, st, c);
})(node, state, override);
}
function makeTest(test) {
if (typeof test === "string")
{ return function (type) { return type === test; } }
else if (!test)
{ return function () { return true; } }
else
{ return test }
}
var Found = function Found(node, state) { this.node = node; this.state = state; };
// A full walk triggers the callback on each node
function full(node, callback, baseVisitor, state, override) {
if (!baseVisitor) { baseVisitor = base
; }(function c(node, st, override) {
var type = override || node.type;
baseVisitor[type](node, st, c);
if (!override) { callback(node, st, type); }
})(node, state, override);
}
// An fullAncestor walk is like an ancestor walk, but triggers
// the callback on each node
function fullAncestor(node, callback, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
var ancestors = []
;(function c(node, st, override) {
var type = override || node.type;
var isNew = node !== ancestors[ancestors.length - 1];
if (isNew) { ancestors.push(node); }
baseVisitor[type](node, st, c);
if (!override) { callback(node, st || ancestors, ancestors, type); }
if (isNew) { ancestors.pop(); }
})(node, state);
}
// Find a node with a given start, end, and type (all are optional,
// null can be used as wildcard). Returns a {node, state} object, or
// undefined when it doesn't find a matching node.
function findNodeAt(node, start, end, test, baseVisitor, state) {
if (!baseVisitor) { baseVisitor = base; }
test = makeTest(test);
try {
(function c(node, st, override) {
var type = override || node.type;
if ((start == null || node.start <= start) &&
(end == null || node.end >= end))
{ baseVisitor[type](node, st, c); }
if ((start == null || node.start === start) &&
(end == null || node.end === end) &&
test(type, node))
{ throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the innermost node of a given type that contains the given
// position. Interface similar to findNodeAt.
function findNodeAround(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
var type = override || node.type;
if (node.start > pos || node.end < pos) { return }
baseVisitor[type](node, st, c);
if (test(type, node)) { throw new Found(node, st) }
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node after a given position.
function findNodeAfter(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
try {
(function c(node, st, override) {
if (node.end < pos) { return }
var type = override || node.type;
if (node.start >= pos && test(type, node)) { throw new Found(node, st) }
baseVisitor[type](node, st, c);
})(node, state);
} catch (e) {
if (e instanceof Found) { return e }
throw e
}
}
// Find the outermost matching node before a given position.
function findNodeBefore(node, pos, test, baseVisitor, state) {
test = makeTest(test);
if (!baseVisitor) { baseVisitor = base; }
var max
;(function c(node, st, override) {
if (node.start > pos) { return }
var type = override || node.type;
if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node))
{ max = new Found(node, st); }
baseVisitor[type](node, st, c);
})(node, state);
return max
}
// Fallback to an Object.create polyfill for older environments.
var create = Object.create || function(proto) {
function Ctor() {}
Ctor.prototype = proto;
return new Ctor
};
// Used to create a custom walker. Will fill in all missing node
// type properties with the defaults.
function make(funcs, baseVisitor) {
var visitor = create(baseVisitor || base);
for (var type in funcs) { visitor[type] = funcs[type]; }
return visitor
}
function skipThrough(node, st, c) { c(node, st); }
function ignore(_node, _st, _c) {}
// Node walkers.
var base = {};
base.Program = base.BlockStatement = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var stmt = list[i];
c(stmt, st, "Statement");
}
};
base.Statement = skipThrough;
base.EmptyStatement = ignore;
base.ExpressionStatement = base.ParenthesizedExpression = base.ChainExpression =
function (node, st, c) { return c(node.expression, st, "Expression"); };
base.IfStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Statement");
if (node.alternate) { c(node.alternate, st, "Statement"); }
};
base.LabeledStatement = function (node, st, c) { return c(node.body, st, "Statement"); };
base.BreakStatement = base.ContinueStatement = ignore;
base.WithStatement = function (node, st, c) {
c(node.object, st, "Expression");
c(node.body, st, "Statement");
};
base.SwitchStatement = function (node, st, c) {
c(node.discriminant, st, "Expression");
for (var i$1 = 0, list$1 = node.cases; i$1 < list$1.length; i$1 += 1) {
var cs = list$1[i$1];
if (cs.test) { c(cs.test, st, "Expression"); }
for (var i = 0, list = cs.consequent; i < list.length; i += 1)
{
var cons = list[i];
c(cons, st, "Statement");
}
}
};
base.SwitchCase = function (node, st, c) {
if (node.test) { c(node.test, st, "Expression"); }
for (var i = 0, list = node.consequent; i < list.length; i += 1)
{
var cons = list[i];
c(cons, st, "Statement");
}
};
base.ReturnStatement = base.YieldExpression = base.AwaitExpression = function (node, st, c) {
if (node.argument) { c(node.argument, st, "Expression"); }
};
base.ThrowStatement = base.SpreadElement =
function (node, st, c) { return c(node.argument, st, "Expression"); };
base.TryStatement = function (node, st, c) {
c(node.block, st, "Statement");
if (node.handler) { c(node.handler, st); }
if (node.finalizer) { c(node.finalizer, st, "Statement"); }
};
base.CatchClause = function (node, st, c) {
if (node.param) { c(node.param, st, "Pattern"); }
c(node.body, st, "Statement");
};
base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
c(node.test, st, "Expression");
c(node.body, st, "Statement");
};
base.ForStatement = function (node, st, c) {
if (node.init) { c(node.init, st, "ForInit"); }
if (node.test) { c(node.test, st, "Expression"); }
if (node.update) { c(node.update, st, "Expression"); }
c(node.body, st, "Statement");
};
base.ForInStatement = base.ForOfStatement = function (node, st, c) {
c(node.left, st, "ForInit");
c(node.right, st, "Expression");
c(node.body, st, "Statement");
};
base.ForInit = function (node, st, c) {
if (node.type === "VariableDeclaration") { c(node, st); }
else { c(node, st, "Expression"); }
};
base.DebuggerStatement = ignore;
base.FunctionDeclaration = function (node, st, c) { return c(node, st, "Function"); };
base.VariableDeclaration = function (node, st, c) {
for (var i = 0, list = node.declarations; i < list.length; i += 1)
{
var decl = list[i];
c(decl, st);
}
};
base.VariableDeclarator = function (node, st, c) {
c(node.id, st, "Pattern");
if (node.init) { c(node.init, st, "Expression"); }
};
base.Function = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
for (var i = 0, list = node.params; i < list.length; i += 1)
{
var param = list[i];
c(param, st, "Pattern");
}
c(node.body, st, node.expression ? "Expression" : "Statement");
};
base.Pattern = function (node, st, c) {
if (node.type === "Identifier")
{ c(node, st, "VariablePattern"); }
else if (node.type === "MemberExpression")
{ c(node, st, "MemberPattern"); }
else
{ c(node, st); }
};
base.VariablePattern = ignore;
base.MemberPattern = skipThrough;
base.RestElement = function (node, st, c) { return c(node.argument, st, "Pattern"); };
base.ArrayPattern = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Pattern"); }
}
};
base.ObjectPattern = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1) {
var prop = list[i];
if (prop.type === "Property") {
if (prop.computed) { c(prop.key, st, "Expression"); }
c(prop.value, st, "Pattern");
} else if (prop.type === "RestElement") {
c(prop.argument, st, "Pattern");
}
}
};
base.Expression = skipThrough;
base.ThisExpression = base.Super = base.MetaProperty = ignore;
base.ArrayExpression = function (node, st, c) {
for (var i = 0, list = node.elements; i < list.length; i += 1) {
var elt = list[i];
if (elt) { c(elt, st, "Expression"); }
}
};
base.ObjectExpression = function (node, st, c) {
for (var i = 0, list = node.properties; i < list.length; i += 1)
{
var prop = list[i];
c(prop, st);
}
};
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = function (node, st, c) {
for (var i = 0, list = node.expressions; i < list.length; i += 1)
{
var expr = list[i];
c(expr, st, "Expression");
}
};
base.TemplateLiteral = function (node, st, c) {
for (var i = 0, list = node.quasis; i < list.length; i += 1)
{
var quasi = list[i];
c(quasi, st);
}
for (var i$1 = 0, list$1 = node.expressions; i$1 < list$1.length; i$1 += 1)
{
var expr = list$1[i$1];
c(expr, st, "Expression");
}
};
base.TemplateElement = ignore;
base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
c(node.argument, st, "Expression");
};
base.BinaryExpression = base.LogicalExpression = function (node, st, c) {
c(node.left, st, "Expression");
c(node.right, st, "Expression");
};
base.AssignmentExpression = base.AssignmentPattern = function (node, st, c) {
c(node.left, st, "Pattern");
c(node.right, st, "Expression");
};
base.ConditionalExpression = function (node, st, c) {
c(node.test, st, "Expression");
c(node.consequent, st, "Expression");
c(node.alternate, st, "Expression");
};
base.NewExpression = base.CallExpression = function (node, st, c) {
c(node.callee, st, "Expression");
if (node.arguments)
{ for (var i = 0, list = node.arguments; i < list.length; i += 1)
{
var arg = list[i];
c(arg, st, "Expression");
} }
};
base.MemberExpression = function (node, st, c) {
c(node.object, st, "Expression");
if (node.computed) { c(node.property, st, "Expression"); }
};
base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
if (node.declaration)
{ c(node.declaration, st, node.type === "ExportNamedDeclaration" || node.declaration.id ? "Statement" : "Expression"); }
if (node.source) { c(node.source, st, "Expression"); }
};
base.ExportAllDeclaration = function (node, st, c) {
if (node.exported)
{ c(node.exported, st); }
c(node.source, st, "Expression");
};
base.ImportDeclaration = function (node, st, c) {
for (var i = 0, list = node.specifiers; i < list.length; i += 1)
{
var spec = list[i];
c(spec, st);
}
c(node.source, st, "Expression");
};
base.ImportExpression = function (node, st, c) {
c(node.source, st, "Expression");
};
base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = ignore;
base.TaggedTemplateExpression = function (node, st, c) {
c(node.tag, st, "Expression");
c(node.quasi, st, "Expression");
};
base.ClassDeclaration = base.ClassExpression = function (node, st, c) { return c(node, st, "Class"); };
base.Class = function (node, st, c) {
if (node.id) { c(node.id, st, "Pattern"); }
if (node.superClass) { c(node.superClass, st, "Expression"); }
c(node.body, st);
};
base.ClassBody = function (node, st, c) {
for (var i = 0, list = node.body; i < list.length; i += 1)
{
var elt = list[i];
c(elt, st);
}
};
base.MethodDefinition = base.Property = function (node, st, c) {
if (node.computed) { c(node.key, st, "Expression"); }
c(node.value, st, "Expression");
};
export { ancestor, base, findNodeAfter, findNodeAround, findNodeAt, findNodeBefore, full, fullAncestor, make, recursive, simple };