+++ /dev/null
-// AST walker module for Mozilla Parser API compatible trees
-
-(function(exports) {
- "use strict";
-
- // 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,
- // Statement, and ScopeBody, 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.
- exports.simple = function(node, visitors, base, state) {
- if (!base) base = exports;
- function c(node, st, override) {
- var type = override || node.type, found = visitors[type];
- if (found) found(node, st);
- base[type](node, st, c);
- }
- c(node, state);
- };
-
- // 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).
- exports.recursive = function(node, state, funcs, base) {
- var visitor = exports.make(funcs, base);
- function c(node, st, override) {
- visitor[override || node.type](node, st, c);
- }
- c(node, state);
- };
-
- // Used to create a custom walker. Will fill in all missing node
- // type properties with the defaults.
- exports.make = function(funcs, base) {
- if (!base) base = exports;
- var visitor = {};
- for (var type in base)
- visitor[type] = funcs.hasOwnProperty(type) ? funcs[type] : base[type];
- return visitor;
- };
-
- function skipThrough(node, st, c) { c(node, st); }
- function ignore(node, st, c) {}
-
- // Node walkers.
-
- exports.Program = exports.BlockStatement = function(node, st, c) {
- for (var i = 0; i < node.body.length; ++i)
- c(node.body[i], st, "Statement");
- };
- exports.Statement = skipThrough;
- exports.EmptyStatement = ignore;
- exports.ExpressionStatement = function(node, st, c) {
- c(node.expression, st, "Expression");
- };
- exports.IfStatement = function(node, st, c) {
- c(node.test, st, "Expression");
- c(node.consequent, st, "Statement");
- if (node.alternate) c(node.alternate, st, "Statement");
- };
- exports.LabeledStatement = function(node, st, c) {
- c(node.body, st, "Statement");
- };
- exports.BreakStatement = exports.ContinueStatement = ignore;
- exports.WithStatement = function(node, st, c) {
- c(node.object, st, "Expression");
- c(node.body, st, "Statement");
- };
- exports.SwitchStatement = function(node, st, c) {
- c(node.discriminant, st, "Expression");
- for (var i = 0; i < node.cases.length; ++i) {
- var cs = node.cases[i];
- if (cs.test) c(cs.test, st, "Expression");
- for (var j = 0; j < cs.consequent.length; ++j)
- c(cs.consequent[j], st, "Statement");
- }
- };
- exports.ReturnStatement = function(node, st, c) {
- if (node.argument) c(node.argument, st, "Expression");
- };
- exports.ThrowStatement = function(node, st, c) {
- c(node.argument, st, "Expression");
- };
- exports.TryStatement = function(node, st, c) {
- c(node.block, st, "Statement");
- for (var i = 0; i < node.handlers.length; ++i)
- c(node.handlers[i].body, st, "ScopeBody");
- if (node.finalizer) c(node.finalizer, st, "Statement");
- };
- exports.WhileStatement = function(node, st, c) {
- c(node.test, st, "Expression");
- c(node.body, st, "Statement");
- };
- exports.DoWhileStatement = exports.WhileStatement;
- exports.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");
- };
- exports.ForInStatement = function(node, st, c) {
- c(node.left, st, "ForInit");
- c(node.right, st, "Expression");
- c(node.body, st, "Statement");
- };
- exports.ForInit = function(node, st, c) {
- if (node.type == "VariableDeclaration") c(node, st);
- else c(node, st, "Expression");
- };
- exports.DebuggerStatement = ignore;
-
- exports.FunctionDeclaration = function(node, st, c) {
- c(node, st, "Function");
- };
- exports.VariableDeclaration = function(node, st, c) {
- for (var i = 0; i < node.declarations.length; ++i) {
- var decl = node.declarations[i];
- if (decl.init) c(decl.init, st, "Expression");
- }
- };
-
- exports.Function = function(node, st, c) {
- c(node.body, st, "ScopeBody");
- };
- exports.ScopeBody = function(node, st, c) {
- c(node, st, "Statement");
- };
-
- exports.Expression = skipThrough;
- exports.ThisExpression = ignore;
- exports.ArrayExpression = function(node, st, c) {
- for (var i = 0; i < node.elements.length; ++i) {
- var elt = node.elements[i];
- if (elt) c(elt, st, "Expression");
- }
- };
- exports.ObjectExpression = function(node, st, c) {
- for (var i = 0; i < node.properties.length; ++i)
- c(node.properties[i].value, st, "Expression");
- };
- exports.FunctionExpression = exports.FunctionDeclaration;
- exports.SequenceExpression = function(node, st, c) {
- for (var i = 0; i < node.expressions.length; ++i)
- c(node.expressions[i], st, "Expression");
- };
- exports.UnaryExpression = exports.UpdateExpression = function(node, st, c) {
- c(node.argument, st, "Expression");
- };
- exports.BinaryExpression = exports.AssignmentExpression = exports.LogicalExpression = function(node, st, c) {
- c(node.left, st, "Expression");
- c(node.right, st, "Expression");
- };
- exports.ConditionalExpression = function(node, st, c) {
- c(node.test, st, "Expression");
- c(node.consequent, st, "Expression");
- c(node.alternate, st, "Expression");
- };
- exports.NewExpression = exports.CallExpression = function(node, st, c) {
- c(node.callee, st, "Expression");
- if (node.arguments) for (var i = 0; i < node.arguments.length; ++i)
- c(node.arguments[i], st, "Expression");
- };
- exports.MemberExpression = function(node, st, c) {
- c(node.object, st, "Expression");
- if (node.computed) c(node.property, st, "Expression");
- };
- exports.Identifier = exports.Literal = ignore;
-
- // A custom walker that keeps track of the scope chain and the
- // variables defined in it.
- function makeScope(prev) {
- return {vars: Object.create(null), prev: prev};
- }
- exports.scopeVisitor = exports.make({
- Function: function(node, scope, c) {
- var inner = makeScope(scope);
- for (var i = 0; i < node.params.length; ++i)
- inner.vars[node.params[i].name] = {type: "argument", node: node.params[i]};
- if (node.id) {
- var decl = node.type == "FunctionDeclaration";
- (decl ? scope : inner).vars[node.id.name] =
- {type: decl ? "function" : "function name", node: node.id};
- }
- c(node.body, inner, "ScopeBody");
- },
- TryStatement: function(node, scope, c) {
- c(node.block, scope, "Statement");
- for (var i = 0; i < node.handlers.length; ++i) {
- var handler = node.handlers[i], inner = makeScope(scope);
- inner.vars[handler.param.name] = {type: "catch clause", node: handler.param};
- c(handler.body, inner, "ScopeBody");
- }
- if (node.finalizer) c(node.finalizer, scope, "Statement");
- },
- VariableDeclaration: function(node, scope, c) {
- for (var i = 0; i < node.declarations.length; ++i) {
- var decl = node.declarations[i];
- scope.vars[decl.id.name] = {type: "var", node: decl.id};
- if (decl.init) c(decl.init, scope, "Expression");
- }
- }
- });
-
-})(typeof exports == "undefined" ? acorn.walk = {} : exports);
git://git.onelab.eu / myslice.git / blobdiff