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// AST walker module for Mozilla Parser API compatible trees |
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(function(exports) { |
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"use strict"; |
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// A simple walk is one where you simply specify callbacks to be |
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// called on specific nodes. The last two arguments are optional. A |
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// simple use would be |
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// |
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// walk.simple(myTree, { |
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// Expression: function(node) { ... } |
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// }); |
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// |
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// to do something with all expressions. All Parser API node types |
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// can be used to identify node types, as well as Expression, |
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// Statement, and ScopeBody, which denote categories of nodes. |
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// |
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// The base argument can be used to pass a custom (recursive) |
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// walker, and state can be used to give this walked an initial |
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// state. |
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exports.simple = function(node, visitors, base, state) { |
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if (!base) base = exports; |
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function c(node, st, override) { |
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var type = override || node.type, found = visitors[type]; |
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if (found) found(node, st); |
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base[type](node, st, c); |
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} |
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c(node, state); |
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}; |
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// A recursive walk is one where your functions override the default |
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// walkers. They can modify and replace the state parameter that's |
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// threaded through the walk, and can opt how and whether to walk |
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// their child nodes (by calling their third argument on these |
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// nodes). |
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exports.recursive = function(node, state, funcs, base) { |
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var visitor = exports.make(funcs, base); |
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function c(node, st, override) { |
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visitor[override || node.type](node, st, c); |
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} |
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c(node, state); |
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}; |
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// Used to create a custom walker. Will fill in all missing node |
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// type properties with the defaults. |
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exports.make = function(funcs, base) { |
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if (!base) base = exports; |
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var visitor = {}; |
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for (var type in base) |
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visitor[type] = funcs.hasOwnProperty(type) ? funcs[type] : base[type]; |
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return visitor; |
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}; |
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function skipThrough(node, st, c) { c(node, st); } |
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function ignore(node, st, c) {} |
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// Node walkers. |
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exports.Program = exports.BlockStatement = function(node, st, c) { |
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for (var i = 0; i < node.body.length; ++i) |
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c(node.body[i], st, "Statement"); |
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}; |
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exports.Statement = skipThrough; |
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exports.EmptyStatement = ignore; |
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exports.ExpressionStatement = function(node, st, c) { |
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c(node.expression, st, "Expression"); |
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}; |
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exports.IfStatement = function(node, st, c) { |
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c(node.test, st, "Expression"); |
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c(node.consequent, st, "Statement"); |
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if (node.alternate) c(node.alternate, st, "Statement"); |
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}; |
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exports.LabeledStatement = function(node, st, c) { |
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c(node.body, st, "Statement"); |
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}; |
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exports.BreakStatement = exports.ContinueStatement = ignore; |
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exports.WithStatement = function(node, st, c) { |
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c(node.object, st, "Expression"); |
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c(node.body, st, "Statement"); |
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}; |
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exports.SwitchStatement = function(node, st, c) { |
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c(node.discriminant, st, "Expression"); |
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for (var i = 0; i < node.cases.length; ++i) { |
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var cs = node.cases[i]; |
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if (cs.test) c(cs.test, st, "Expression"); |
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for (var j = 0; j < cs.consequent.length; ++j) |
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c(cs.consequent[j], st, "Statement"); |
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} |
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}; |
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exports.ReturnStatement = function(node, st, c) { |
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if (node.argument) c(node.argument, st, "Expression"); |
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}; |
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exports.ThrowStatement = function(node, st, c) { |
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c(node.argument, st, "Expression"); |
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}; |
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exports.TryStatement = function(node, st, c) { |
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c(node.block, st, "Statement"); |
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for (var i = 0; i < node.handlers.length; ++i) |
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c(node.handlers[i].body, st, "ScopeBody"); |
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if (node.finalizer) c(node.finalizer, st, "Statement"); |
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}; |
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exports.WhileStatement = function(node, st, c) { |
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c(node.test, st, "Expression"); |
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c(node.body, st, "Statement"); |
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}; |
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exports.DoWhileStatement = exports.WhileStatement; |
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exports.ForStatement = function(node, st, c) { |
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if (node.init) c(node.init, st, "ForInit"); |
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if (node.test) c(node.test, st, "Expression"); |
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if (node.update) c(node.update, st, "Expression"); |
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c(node.body, st, "Statement"); |
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}; |
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exports.ForInStatement = function(node, st, c) { |
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c(node.left, st, "ForInit"); |
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c(node.right, st, "Expression"); |
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c(node.body, st, "Statement"); |
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}; |
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exports.ForInit = function(node, st, c) { |
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if (node.type == "VariableDeclaration") c(node, st); |
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else c(node, st, "Expression"); |
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}; |
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exports.DebuggerStatement = ignore; |
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exports.FunctionDeclaration = function(node, st, c) { |
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c(node, st, "Function"); |
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}; |
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exports.VariableDeclaration = function(node, st, c) { |
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for (var i = 0; i < node.declarations.length; ++i) { |
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var decl = node.declarations[i]; |
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if (decl.init) c(decl.init, st, "Expression"); |
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} |
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}; |
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exports.Function = function(node, st, c) { |
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c(node.body, st, "ScopeBody"); |
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}; |
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exports.ScopeBody = function(node, st, c) { |
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c(node, st, "Statement"); |
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}; |
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exports.Expression = skipThrough; |
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exports.ThisExpression = ignore; |
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exports.ArrayExpression = function(node, st, c) { |
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for (var i = 0; i < node.elements.length; ++i) { |
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var elt = node.elements[i]; |
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if (elt) c(elt, st, "Expression"); |
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} |
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}; |
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exports.ObjectExpression = function(node, st, c) { |
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for (var i = 0; i < node.properties.length; ++i) |
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c(node.properties[i].value, st, "Expression"); |
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}; |
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exports.FunctionExpression = exports.FunctionDeclaration; |
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exports.SequenceExpression = function(node, st, c) { |
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for (var i = 0; i < node.expressions.length; ++i) |
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c(node.expressions[i], st, "Expression"); |
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}; |
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exports.UnaryExpression = exports.UpdateExpression = function(node, st, c) { |
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c(node.argument, st, "Expression"); |
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}; |
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exports.BinaryExpression = exports.AssignmentExpression = exports.LogicalExpression = function(node, st, c) { |
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c(node.left, st, "Expression"); |
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c(node.right, st, "Expression"); |
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}; |
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exports.ConditionalExpression = function(node, st, c) { |
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c(node.test, st, "Expression"); |
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c(node.consequent, st, "Expression"); |
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c(node.alternate, st, "Expression"); |
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}; |
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exports.NewExpression = exports.CallExpression = function(node, st, c) { |
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c(node.callee, st, "Expression"); |
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if (node.arguments) for (var i = 0; i < node.arguments.length; ++i) |
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c(node.arguments[i], st, "Expression"); |
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}; |
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exports.MemberExpression = function(node, st, c) { |
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c(node.object, st, "Expression"); |
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if (node.computed) c(node.property, st, "Expression"); |
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}; |
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exports.Identifier = exports.Literal = ignore; |
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// A custom walker that keeps track of the scope chain and the |
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// variables defined in it. |
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function makeScope(prev) { |
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return {vars: Object.create(null), prev: prev}; |
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} |
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exports.scopeVisitor = exports.make({ |
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Function: function(node, scope, c) { |
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var inner = makeScope(scope); |
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for (var i = 0; i < node.params.length; ++i) |
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inner.vars[node.params[i].name] = {type: "argument", node: node.params[i]}; |
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if (node.id) { |
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var decl = node.type == "FunctionDeclaration"; |
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(decl ? scope : inner).vars[node.id.name] = |
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{type: decl ? "function" : "function name", node: node.id}; |
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} |
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c(node.body, inner, "ScopeBody"); |
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}, |
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TryStatement: function(node, scope, c) { |
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c(node.block, scope, "Statement"); |
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for (var i = 0; i < node.handlers.length; ++i) { |
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var handler = node.handlers[i], inner = makeScope(scope); |
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inner.vars[handler.param.name] = {type: "catch clause", node: handler.param}; |
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c(handler.body, inner, "ScopeBody"); |
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} |
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if (node.finalizer) c(node.finalizer, scope, "Statement"); |
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}, |
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VariableDeclaration: function(node, scope, c) { |
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for (var i = 0; i < node.declarations.length; ++i) { |
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var decl = node.declarations[i]; |
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scope.vars[decl.id.name] = {type: "var", node: decl.id}; |
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if (decl.init) c(decl.init, scope, "Expression"); |
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} |
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} |
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}); |
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})(typeof exports == "undefined" ? acorn.walk = {} : exports); |