public void Visit(ArrayLiteral node) { if (node != null) { DoesRequire = true; } }
public void Visit(ArrayLiteral node) { if (node != null) { // if this is multi-line output, we're going to want to run some checks first // to see if we want to put the array all on one line or put elements on separate lines. var multiLine = false; if (m_settings.OutputMode == OutputMode.MultipleLines) { if (node.Elements.Count > 5 || NotJustPrimitives(node.Elements)) { multiLine = true; } } m_writer.Write('['); if (node.Elements != null) { if (multiLine) { // multiline -- let's pretty it up a bit m_settings.Indent(); try { var first = true; foreach (var element in node.Elements) { if (first) { first = false; } else { m_writer.Write(','); } NewLine(); element.Accept(this); } } finally { m_settings.Unindent(); } NewLine(); } else { // not multiline, so just run through all the items node.Elements.Accept(this); } } m_writer.Write(']'); } }
public void Visit(ArrayLiteral node) { // starts with a '[', so we don't care }
public void Visit(ArrayLiteral node) { // don't recurse; we don't need parens around this }
internal override void AnalyzeNode() { // see if this is a member (we'll need it for a couple checks) Member member = m_func as Member; if (Parser.Settings.StripDebugStatements && Parser.Settings.IsModificationAllowed(TreeModifications.StripDebugStatements)) { // if this is a member, and it's a debugger object, and it's a constructor.... if (member != null && member.IsDebuggerStatement && m_isConstructor) { // we need to replace our debugger object with a generic Object m_func = new Lookup("Object", m_func.Context, Parser); // and make sure the node list is empty if (m_args != null && m_args.Count > 0) { m_args = new AstNodeList(m_args.Context, Parser); } } } // if this is a constructor and we want to collapse // some of them to literals... if (m_isConstructor && Parser.Settings.CollapseToLiteral) { // see if this is a lookup, and if so, if it's pointing to one // of the two constructors we want to collapse Lookup lookup = m_func as Lookup; if (lookup != null) { if (lookup.Name == "Object" && Parser.Settings.IsModificationAllowed(TreeModifications.NewObjectToObjectLiteral)) { // no arguments -- the Object constructor with no arguments is the exact same as an empty // object literal if (m_args == null || m_args.Count == 0) { // replace our node with an object literal ObjectLiteral objLiteral = new ObjectLiteral(Context, Parser, null, null); if (Parent.ReplaceChild(this, objLiteral)) { // and bail now. No need to recurse -- it's an empty literal return; } } else if (m_args.Count == 1) { // one argument // check to see if it's an object literal. ObjectLiteral objectLiteral = m_args[0] as ObjectLiteral; if (objectLiteral != null) { // the Object constructor with an argument that is a JavaScript object merely returns the // argument. Since the argument is an object literal, it is by definition a JavaScript object // and therefore we can replace the constructor call with the object literal Parent.ReplaceChild(this, objectLiteral); // don't forget to recurse the object now objectLiteral.AnalyzeNode(); // and then bail -- we don't want to process this call // operation any more; we've gotten rid of it return; } } } else if (lookup.Name == "Array" && Parser.Settings.IsModificationAllowed(TreeModifications.NewArrayToArrayLiteral)) { // Array is trickier. // If there are no arguments, then just use []. // if there are multiple arguments, then use [arg0,arg1...argN]. // but if there is one argument and it's numeric, we can't crunch it. // also can't crunch if it's a function call or a member or something, since we won't // KNOW whether or not it's numeric. // // so first see if it even is a single-argument constant wrapper. ConstantWrapper constWrapper = (m_args != null && m_args.Count == 1 ? m_args[0] as ConstantWrapper : null); // if the argument count is not one, then we crunch. // if the argument count IS one, we only crunch if we have a constant wrapper, // AND it's not numeric. if (m_args == null || m_args.Count != 1 || (constWrapper != null && !constWrapper.IsNumericLiteral)) { // create the new array literal object ArrayLiteral arrayLiteral = new ArrayLiteral(Context, Parser, m_args); // replace ourself within our parent if (Parent.ReplaceChild(this, arrayLiteral)) { // recurse arrayLiteral.AnalyzeNode(); // and bail -- we don't want to recurse this node any more return; } } } } } // if we are replacing resource references with strings generated from resource files // and this is a brackets call: lookup[args] ResourceStrings resourceStrings = Parser.ResourceStrings; if (m_inBrackets && resourceStrings != null && resourceStrings.Count > 0) { // see if the root object is a lookup that corresponds to the // global value (not a local field) for our resource object // (same name) Lookup rootLookup = m_func as Lookup; if (rootLookup != null && rootLookup.LocalField == null && string.CompareOrdinal(rootLookup.Name, resourceStrings.Name) == 0) { // we're going to replace this node with a string constant wrapper // but first we need to make sure that this is a valid lookup. // if the parameter contains anything that would vary at run-time, // then we need to throw an error. // the parser will always have either one or zero nodes in the arguments // arg list. We're not interested in zero args, so just make sure there is one if (m_args.Count == 1) { // must be a constant wrapper ConstantWrapper argConstant = m_args[0] as ConstantWrapper; if (argConstant != null) { string resourceName = argConstant.Value.ToString(); // get the localized string from the resources object ConstantWrapper resourceLiteral = new ConstantWrapper( resourceStrings[resourceName], PrimitiveType.String, Context, Parser); // replace this node with localized string, analyze it, and bail // so we don't anaylze the tree we just replaced Parent.ReplaceChild(this, resourceLiteral); resourceLiteral.AnalyzeNode(); return; } else { // error! must be a constant Context.HandleError( JSError.ResourceReferenceMustBeConstant, true); } } else { // error! can only be a single constant argument to the string resource object. // the parser will only have zero or one arguments, so this must be zero // (since the parser won't pass multiple args to a [] operator) Context.HandleError( JSError.ResourceReferenceMustBeConstant, true); } } } // and finally, if this is a backets call and the argument is a constantwrapper that can // be an identifier, just change us to a member node: obj["prop"] to obj.prop. // but ONLY if the string value is "safe" to be an identifier. Even though the ECMA-262 // spec says certain Unicode categories are okay, in practice the various major browsers // all seem to have problems with certain characters in identifiers. Rather than risking // some browsers breaking when we change this syntax, don't do it for those "danger" categories. if (m_inBrackets && m_args != null) { // see if there is a single, constant argument string argText = m_args.SingleConstantArgument; if (argText != null) { // see if we want to replace the name string newName; if (Parser.Settings.HasRenamePairs && Parser.Settings.ManualRenamesProperties && Parser.Settings.IsModificationAllowed(TreeModifications.PropertyRenaming) && !string.IsNullOrEmpty(newName = Parser.Settings.GetNewName(argText))) { // yes -- we are going to replace the name, either as a string literal, or by converting // to a member-dot operation. // See if we can't turn it into a dot-operator. If we can't, then we just want to replace the operator with // a new constant wrapper. Otherwise we'll just replace the operator with a new constant wrapper. if (Parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember) && JSScanner.IsSafeIdentifier(newName) && !JSScanner.IsKeyword(newName)) { // the new name is safe to convert to a member-dot operator. // but we don't want to convert the node to the NEW name, because we still need to Analyze the // new member node -- and it might convert the new name to something else. So instead we're // just going to convert this existing string to a member node WITH THE OLD STRING, // and THEN analyze it (which will convert the old string to newName) Member replacementMember = new Member(Context, Parser, m_func, argText); Parent.ReplaceChild(this, replacementMember); // this analyze call will convert the old-name member to the newName value replacementMember.AnalyzeNode(); return; } else { // nope; can't convert to a dot-operator. // we're just going to replace the first argument with a new string literal // and continue along our merry way. m_args.ReplaceChild(m_args[0], new ConstantWrapper(newName, PrimitiveType.String, m_args[0].Context, Parser)); } } else if (Parser.Settings.IsModificationAllowed(TreeModifications.BracketMemberToDotMember) && JSScanner.IsSafeIdentifier(argText) && !JSScanner.IsKeyword(argText)) { // not a replacement, but the string literal is a safe identifier. So we will // replace this call node with a Member-dot operation Member replacementMember = new Member(Context, Parser, m_func, argText); Parent.ReplaceChild(this, replacementMember); replacementMember.AnalyzeNode(); return; } } } // call the base class to recurse base.AnalyzeNode(); // call this AFTER recursing to give the fields a chance to resolve, because we only // want to make this replacement if we are working on the global Date object. if (!m_inBrackets && !m_isConstructor && (m_args == null || m_args.Count == 0) && member != null && string.CompareOrdinal(member.Name, "getTime") == 0 && Parser.Settings.IsModificationAllowed(TreeModifications.DateGetTimeToUnaryPlus)) { // this is not a constructor and it's not a brackets call, and there are no arguments. // if the function is a member operation to "getTime" and the object of the member is a // constructor call to the global "Date" object (not a local), then we want to replace the call // with a unary plus on the Date constructor. Converting to numeric type is the same as // calling getTime, so it's the equivalent with much fewer bytes. CallNode dateConstructor = member.Root as CallNode; if (dateConstructor != null && dateConstructor.IsConstructor) { // lookup for the predifined (not local) "Date" field Lookup lookup = dateConstructor.Function as Lookup; if (lookup != null && string.CompareOrdinal(lookup.Name, "Date") == 0 && lookup.LocalField == null) { // this is in the pattern: (new Date()).getTime() // we want to replace it with +new Date // use the same date constructor node as the operand NumericUnary unary = new NumericUnary(Context, Parser, dateConstructor, JSToken.Plus); // replace us (the call to the getTime method) with this unary operator Parent.ReplaceChild(this, unary); // don't need to AnalyzeNode on the unary operator. The operand has already // been analyzed when we recursed, and the unary operator wouldn't do anything // special anyway (since the operand is not a numeric constant) } } } else if (Parser.Settings.EvalTreatment != EvalTreatment.Ignore) { // if this is a window.eval call, then we need to mark this scope as unknown just as // we would if this was a regular eval call. // (unless, of course, the parser settings say evals are safe) // call AFTER recursing so we know the left-hand side properties have had a chance to // lookup their fields to see if they are local or global if (member != null && string.CompareOrdinal(member.Name, "eval") == 0) { if (member.LeftHandSide.IsWindowLookup) { // this is a call to window.eval() // mark this scope as unknown so we don't crunch out locals // we might reference in the eval at runtime ScopeStack.Peek().IsKnownAtCompileTime = false; } } else { CallNode callNode = m_func as CallNode; if (callNode != null && callNode.InBrackets && callNode.LeftHandSide.IsWindowLookup && callNode.Arguments.IsSingleConstantArgument("eval")) { // this is a call to window["eval"] // mark this scope as unknown so we don't crunch out locals // we might reference in the eval at runtime ScopeStack.Peek().IsKnownAtCompileTime = false; } } } /* REVIEW: may be too late. lookups may alread have been analyzed and * found undefined * // check to see if this is an assignment to a window["prop"] structure * BinaryOperator binaryOp = Parent as BinaryOperator; * if (binaryOp != null && binaryOp.IsAssign * && m_inBrackets * && m_func.IsWindowLookup * && m_args != null) * { * // and IF the property is a non-empty constant that isn't currently * // a global field... * string propertyName = m_args.SingleConstantArgument; * if (!string.IsNullOrEmpty(propertyName) * && Parser.GlobalScope[propertyName] == null) * { * // we want to also add it to the global fields so it's not undefined * Parser.GlobalScope.DeclareField(propertyName, null, 0); * } * } */ }
public void Visit(ArrayLiteral node) { // recurse each element node.IfNotNull(n => n.Elements.ForEach(e => e.Accept(this))); }