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				14 KiB
			
		
		
			
		
	
	
					444 lines
				
				14 KiB
			| 
											3 years ago
										 | // 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
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|  | // simple use would be
 | ||
|  | //
 | ||
|  | //     walk.simple(myTree, {
 | ||
|  | //         Expression: function(node) { ... }
 | ||
|  | //     });
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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 and
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|  | // Statement, which denote categories of nodes.
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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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|  | 
 | ||
|  | 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
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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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|  | 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
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|  | function full(node, callback, baseVisitor, state, override) { | ||
|  |   if (!baseVisitor) { baseVisitor = base; } | ||
|  |   var last | ||
|  |   ;(function c(node, st, override) { | ||
|  |     var type = override || node.type; | ||
|  |     baseVisitor[type](node, st, c); | ||
|  |     if (last !== node) { | ||
|  |       callback(node, st, type); | ||
|  |       last = node; | ||
|  |     } | ||
|  |   })(node, state, override); | ||
|  | } | ||
|  | 
 | ||
|  | // An fullAncestor walk is like an ancestor walk, but triggers
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|  | // the callback on each node
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|  | function fullAncestor(node, callback, baseVisitor, state) { | ||
|  |   if (!baseVisitor) { baseVisitor = base; } | ||
|  |   var ancestors = [], last | ||
|  |   ;(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 (last !== node) { | ||
|  |       callback(node, st || ancestors, ancestors, type); | ||
|  |       last = node; | ||
|  |     } | ||
|  |     if (isNew) { ancestors.pop(); } | ||
|  |   })(node, state); | ||
|  | } | ||
|  | 
 | ||
|  | // Find a node with a given start, end, and type (all are optional,
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|  | // null can be used as wildcard). Returns a {node, state} object, or
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|  | // undefined when it doesn't find a matching node.
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|  | 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
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|  | // 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 | ||
|  | } | ||
|  | 
 | ||
|  | // 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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|  | function make(funcs, baseVisitor) { | ||
|  |   var visitor = Object.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 = base.StaticBlock = 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.PrivateIdentifier = 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.PropertyDefinition = base.Property = function (node, st, c) { | ||
|  |   if (node.computed) { c(node.key, st, "Expression"); } | ||
|  |   if (node.value) { c(node.value, st, "Expression"); } | ||
|  | }; | ||
|  | 
 | ||
|  | export { ancestor, base, findNodeAfter, findNodeAround, findNodeAt, findNodeBefore, full, fullAncestor, make, recursive, simple }; |