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Copy pathparser.ts
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5424 lines (4753 loc) · 261 KB
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/// <reference path="scanner.ts"/>
/// <reference path="utilities.ts"/>
module ts {
let nodeConstructors = new Array<new () => Node>(SyntaxKind.Count);
/* @internal */ export let parseTime = 0;
export function getNodeConstructor(kind: SyntaxKind): new () => Node {
return nodeConstructors[kind] || (nodeConstructors[kind] = objectAllocator.getNodeConstructor(kind));
}
export function createNode(kind: SyntaxKind): Node {
return new (getNodeConstructor(kind))();
}
function visitNode<T>(cbNode: (node: Node) => T, node: Node): T {
if (node) {
return cbNode(node);
}
}
function visitNodeArray<T>(cbNodes: (nodes: Node[]) => T, nodes: Node[]) {
if (nodes) {
return cbNodes(nodes);
}
}
function visitEachNode<T>(cbNode: (node: Node) => T, nodes: Node[]) {
if (nodes) {
for (let node of nodes) {
let result = cbNode(node);
if (result) {
return result;
}
}
}
}
// Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
// stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
// embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
// a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
export function forEachChild<T>(node: Node, cbNode: (node: Node) => T, cbNodeArray?: (nodes: Node[]) => T): T {
if (!node) {
return;
}
// The visitXXX functions could be written as local functions that close over the cbNode and cbNodeArray
// callback parameters, but that causes a closure allocation for each invocation with noticeable effects
// on performance.
let visitNodes: (cb: (node: Node | Node[]) => T, nodes: Node[]) => T = cbNodeArray ? visitNodeArray : visitEachNode;
let cbNodes = cbNodeArray || cbNode;
switch (node.kind) {
case SyntaxKind.QualifiedName:
return visitNode(cbNode, (<QualifiedName>node).left) ||
visitNode(cbNode, (<QualifiedName>node).right);
case SyntaxKind.TypeParameter:
return visitNode(cbNode, (<TypeParameterDeclaration>node).name) ||
visitNode(cbNode, (<TypeParameterDeclaration>node).constraint) ||
visitNode(cbNode, (<TypeParameterDeclaration>node).expression);
case SyntaxKind.Parameter:
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.PropertyAssignment:
case SyntaxKind.ShorthandPropertyAssignment:
case SyntaxKind.VariableDeclaration:
case SyntaxKind.BindingElement:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).propertyName) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).dotDotDotToken) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).name) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).questionToken) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).type) ||
visitNode(cbNode, (<VariableLikeDeclaration>node).initializer);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNodes(cbNodes, (<SignatureDeclaration>node).typeParameters) ||
visitNodes(cbNodes, (<SignatureDeclaration>node).parameters) ||
visitNode(cbNode, (<SignatureDeclaration>node).type);
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionExpression:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ArrowFunction:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<FunctionLikeDeclaration>node).asteriskToken) ||
visitNode(cbNode, (<FunctionLikeDeclaration>node).name) ||
visitNode(cbNode, (<FunctionLikeDeclaration>node).questionToken) ||
visitNodes(cbNodes, (<FunctionLikeDeclaration>node).typeParameters) ||
visitNodes(cbNodes, (<FunctionLikeDeclaration>node).parameters) ||
visitNode(cbNode, (<FunctionLikeDeclaration>node).type) ||
visitNode(cbNode, (<ArrowFunction>node).equalsGreaterThanToken) ||
visitNode(cbNode, (<FunctionLikeDeclaration>node).body);
case SyntaxKind.TypeReference:
return visitNode(cbNode, (<TypeReferenceNode>node).typeName) ||
visitNodes(cbNodes, (<TypeReferenceNode>node).typeArguments);
case SyntaxKind.TypeQuery:
return visitNode(cbNode, (<TypeQueryNode>node).exprName);
case SyntaxKind.TypeLiteral:
return visitNodes(cbNodes, (<TypeLiteralNode>node).members);
case SyntaxKind.ArrayType:
return visitNode(cbNode, (<ArrayTypeNode>node).elementType);
case SyntaxKind.TupleType:
return visitNodes(cbNodes, (<TupleTypeNode>node).elementTypes);
case SyntaxKind.UnionType:
return visitNodes(cbNodes, (<UnionTypeNode>node).types);
case SyntaxKind.ParenthesizedType:
return visitNode(cbNode, (<ParenthesizedTypeNode>node).type);
case SyntaxKind.ObjectBindingPattern:
case SyntaxKind.ArrayBindingPattern:
return visitNodes(cbNodes, (<BindingPattern>node).elements);
case SyntaxKind.ArrayLiteralExpression:
return visitNodes(cbNodes, (<ArrayLiteralExpression>node).elements);
case SyntaxKind.ObjectLiteralExpression:
return visitNodes(cbNodes, (<ObjectLiteralExpression>node).properties);
case SyntaxKind.PropertyAccessExpression:
return visitNode(cbNode, (<PropertyAccessExpression>node).expression) ||
visitNode(cbNode, (<PropertyAccessExpression>node).dotToken) ||
visitNode(cbNode, (<PropertyAccessExpression>node).name);
case SyntaxKind.ElementAccessExpression:
return visitNode(cbNode, (<ElementAccessExpression>node).expression) ||
visitNode(cbNode, (<ElementAccessExpression>node).argumentExpression);
case SyntaxKind.CallExpression:
case SyntaxKind.NewExpression:
return visitNode(cbNode, (<CallExpression>node).expression) ||
visitNodes(cbNodes, (<CallExpression>node).typeArguments) ||
visitNodes(cbNodes, (<CallExpression>node).arguments);
case SyntaxKind.TaggedTemplateExpression:
return visitNode(cbNode, (<TaggedTemplateExpression>node).tag) ||
visitNode(cbNode, (<TaggedTemplateExpression>node).template);
case SyntaxKind.TypeAssertionExpression:
return visitNode(cbNode, (<TypeAssertion>node).type) ||
visitNode(cbNode, (<TypeAssertion>node).expression);
case SyntaxKind.ParenthesizedExpression:
return visitNode(cbNode, (<ParenthesizedExpression>node).expression);
case SyntaxKind.DeleteExpression:
return visitNode(cbNode, (<DeleteExpression>node).expression);
case SyntaxKind.TypeOfExpression:
return visitNode(cbNode, (<TypeOfExpression>node).expression);
case SyntaxKind.VoidExpression:
return visitNode(cbNode, (<VoidExpression>node).expression);
case SyntaxKind.PrefixUnaryExpression:
return visitNode(cbNode, (<PrefixUnaryExpression>node).operand);
case SyntaxKind.YieldExpression:
return visitNode(cbNode, (<YieldExpression>node).asteriskToken) ||
visitNode(cbNode, (<YieldExpression>node).expression);
case SyntaxKind.PostfixUnaryExpression:
return visitNode(cbNode, (<PostfixUnaryExpression>node).operand);
case SyntaxKind.BinaryExpression:
return visitNode(cbNode, (<BinaryExpression>node).left) ||
visitNode(cbNode, (<BinaryExpression>node).operatorToken) ||
visitNode(cbNode, (<BinaryExpression>node).right);
case SyntaxKind.ConditionalExpression:
return visitNode(cbNode, (<ConditionalExpression>node).condition) ||
visitNode(cbNode, (<ConditionalExpression>node).questionToken) ||
visitNode(cbNode, (<ConditionalExpression>node).whenTrue) ||
visitNode(cbNode, (<ConditionalExpression>node).colonToken) ||
visitNode(cbNode, (<ConditionalExpression>node).whenFalse);
case SyntaxKind.SpreadElementExpression:
return visitNode(cbNode, (<SpreadElementExpression>node).expression);
case SyntaxKind.Block:
case SyntaxKind.ModuleBlock:
return visitNodes(cbNodes, (<Block>node).statements);
case SyntaxKind.SourceFile:
return visitNodes(cbNodes, (<SourceFile>node).statements) ||
visitNode(cbNode, (<SourceFile>node).endOfFileToken);
case SyntaxKind.VariableStatement:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<VariableStatement>node).declarationList);
case SyntaxKind.VariableDeclarationList:
return visitNodes(cbNodes, (<VariableDeclarationList>node).declarations);
case SyntaxKind.ExpressionStatement:
return visitNode(cbNode, (<ExpressionStatement>node).expression);
case SyntaxKind.IfStatement:
return visitNode(cbNode, (<IfStatement>node).expression) ||
visitNode(cbNode, (<IfStatement>node).thenStatement) ||
visitNode(cbNode, (<IfStatement>node).elseStatement);
case SyntaxKind.DoStatement:
return visitNode(cbNode, (<DoStatement>node).statement) ||
visitNode(cbNode, (<DoStatement>node).expression);
case SyntaxKind.WhileStatement:
return visitNode(cbNode, (<WhileStatement>node).expression) ||
visitNode(cbNode, (<WhileStatement>node).statement);
case SyntaxKind.ForStatement:
return visitNode(cbNode, (<ForStatement>node).initializer) ||
visitNode(cbNode, (<ForStatement>node).condition) ||
visitNode(cbNode, (<ForStatement>node).iterator) ||
visitNode(cbNode, (<ForStatement>node).statement);
case SyntaxKind.ForInStatement:
return visitNode(cbNode, (<ForInStatement>node).initializer) ||
visitNode(cbNode, (<ForInStatement>node).expression) ||
visitNode(cbNode, (<ForInStatement>node).statement);
case SyntaxKind.ForOfStatement:
return visitNode(cbNode, (<ForOfStatement>node).initializer) ||
visitNode(cbNode, (<ForOfStatement>node).expression) ||
visitNode(cbNode, (<ForOfStatement>node).statement);
case SyntaxKind.ContinueStatement:
case SyntaxKind.BreakStatement:
return visitNode(cbNode, (<BreakOrContinueStatement>node).label);
case SyntaxKind.ReturnStatement:
return visitNode(cbNode, (<ReturnStatement>node).expression);
case SyntaxKind.WithStatement:
return visitNode(cbNode, (<WithStatement>node).expression) ||
visitNode(cbNode, (<WithStatement>node).statement);
case SyntaxKind.SwitchStatement:
return visitNode(cbNode, (<SwitchStatement>node).expression) ||
visitNode(cbNode, (<SwitchStatement>node).caseBlock);
case SyntaxKind.CaseBlock:
return visitNodes(cbNodes, (<CaseBlock>node).clauses);
case SyntaxKind.CaseClause:
return visitNode(cbNode, (<CaseClause>node).expression) ||
visitNodes(cbNodes, (<CaseClause>node).statements);
case SyntaxKind.DefaultClause:
return visitNodes(cbNodes, (<DefaultClause>node).statements);
case SyntaxKind.LabeledStatement:
return visitNode(cbNode, (<LabeledStatement>node).label) ||
visitNode(cbNode, (<LabeledStatement>node).statement);
case SyntaxKind.ThrowStatement:
return visitNode(cbNode, (<ThrowStatement>node).expression);
case SyntaxKind.TryStatement:
return visitNode(cbNode, (<TryStatement>node).tryBlock) ||
visitNode(cbNode, (<TryStatement>node).catchClause) ||
visitNode(cbNode, (<TryStatement>node).finallyBlock);
case SyntaxKind.CatchClause:
return visitNode(cbNode, (<CatchClause>node).variableDeclaration) ||
visitNode(cbNode, (<CatchClause>node).block);
case SyntaxKind.Decorator:
return visitNode(cbNode, (<Decorator>node).expression);
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ClassLikeDeclaration>node).name) ||
visitNodes(cbNodes, (<ClassLikeDeclaration>node).typeParameters) ||
visitNodes(cbNodes, (<ClassLikeDeclaration>node).heritageClauses) ||
visitNodes(cbNodes, (<ClassLikeDeclaration>node).members);
case SyntaxKind.InterfaceDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<InterfaceDeclaration>node).name) ||
visitNodes(cbNodes, (<InterfaceDeclaration>node).typeParameters) ||
visitNodes(cbNodes, (<ClassDeclaration>node).heritageClauses) ||
visitNodes(cbNodes, (<InterfaceDeclaration>node).members);
case SyntaxKind.TypeAliasDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<TypeAliasDeclaration>node).name) ||
visitNode(cbNode, (<TypeAliasDeclaration>node).type);
case SyntaxKind.EnumDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<EnumDeclaration>node).name) ||
visitNodes(cbNodes, (<EnumDeclaration>node).members);
case SyntaxKind.EnumMember:
return visitNode(cbNode, (<EnumMember>node).name) ||
visitNode(cbNode, (<EnumMember>node).initializer);
case SyntaxKind.ModuleDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ModuleDeclaration>node).name) ||
visitNode(cbNode, (<ModuleDeclaration>node).body);
case SyntaxKind.ImportEqualsDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ImportEqualsDeclaration>node).name) ||
visitNode(cbNode, (<ImportEqualsDeclaration>node).moduleReference);
case SyntaxKind.ImportDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ImportDeclaration>node).importClause) ||
visitNode(cbNode, (<ImportDeclaration>node).moduleSpecifier);
case SyntaxKind.ImportClause:
return visitNode(cbNode, (<ImportClause>node).name) ||
visitNode(cbNode, (<ImportClause>node).namedBindings);
case SyntaxKind.NamespaceImport:
return visitNode(cbNode, (<NamespaceImport>node).name);
case SyntaxKind.NamedImports:
case SyntaxKind.NamedExports:
return visitNodes(cbNodes, (<NamedImportsOrExports>node).elements);
case SyntaxKind.ExportDeclaration:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ExportDeclaration>node).exportClause) ||
visitNode(cbNode, (<ExportDeclaration>node).moduleSpecifier);
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ExportSpecifier:
return visitNode(cbNode, (<ImportOrExportSpecifier>node).propertyName) ||
visitNode(cbNode, (<ImportOrExportSpecifier>node).name);
case SyntaxKind.ExportAssignment:
return visitNodes(cbNodes, node.decorators) ||
visitNodes(cbNodes, node.modifiers) ||
visitNode(cbNode, (<ExportAssignment>node).expression);
case SyntaxKind.TemplateExpression:
return visitNode(cbNode, (<TemplateExpression>node).head) || visitNodes(cbNodes, (<TemplateExpression>node).templateSpans);
case SyntaxKind.TemplateSpan:
return visitNode(cbNode, (<TemplateSpan>node).expression) || visitNode(cbNode, (<TemplateSpan>node).literal);
case SyntaxKind.ComputedPropertyName:
return visitNode(cbNode, (<ComputedPropertyName>node).expression);
case SyntaxKind.HeritageClause:
return visitNodes(cbNodes, (<HeritageClause>node).types);
case SyntaxKind.HeritageClauseElement:
return visitNode(cbNode, (<HeritageClauseElement>node).expression) ||
visitNodes(cbNodes, (<HeritageClauseElement>node).typeArguments);
case SyntaxKind.ExternalModuleReference:
return visitNode(cbNode, (<ExternalModuleReference>node).expression);
case SyntaxKind.MissingDeclaration:
return visitNodes(cbNodes, node.decorators);
}
}
const enum ParsingContext {
SourceElements, // Elements in source file
ModuleElements, // Elements in module declaration
BlockStatements, // Statements in block
SwitchClauses, // Clauses in switch statement
SwitchClauseStatements, // Statements in switch clause
TypeMembers, // Members in interface or type literal
ClassMembers, // Members in class declaration
EnumMembers, // Members in enum declaration
HeritageClauseElement, // Elements in a heritage clause
VariableDeclarations, // Variable declarations in variable statement
ObjectBindingElements, // Binding elements in object binding list
ArrayBindingElements, // Binding elements in array binding list
ArgumentExpressions, // Expressions in argument list
ObjectLiteralMembers, // Members in object literal
ArrayLiteralMembers, // Members in array literal
Parameters, // Parameters in parameter list
TypeParameters, // Type parameters in type parameter list
TypeArguments, // Type arguments in type argument list
TupleElementTypes, // Element types in tuple element type list
HeritageClauses, // Heritage clauses for a class or interface declaration.
ImportOrExportSpecifiers, // Named import clause's import specifier list
Count // Number of parsing contexts
}
const enum Tristate {
False,
True,
Unknown
}
function parsingContextErrors(context: ParsingContext): DiagnosticMessage {
switch (context) {
case ParsingContext.SourceElements: return Diagnostics.Declaration_or_statement_expected;
case ParsingContext.ModuleElements: return Diagnostics.Declaration_or_statement_expected;
case ParsingContext.BlockStatements: return Diagnostics.Statement_expected;
case ParsingContext.SwitchClauses: return Diagnostics.case_or_default_expected;
case ParsingContext.SwitchClauseStatements: return Diagnostics.Statement_expected;
case ParsingContext.TypeMembers: return Diagnostics.Property_or_signature_expected;
case ParsingContext.ClassMembers: return Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
case ParsingContext.EnumMembers: return Diagnostics.Enum_member_expected;
case ParsingContext.HeritageClauseElement: return Diagnostics.Expression_expected;
case ParsingContext.VariableDeclarations: return Diagnostics.Variable_declaration_expected;
case ParsingContext.ObjectBindingElements: return Diagnostics.Property_destructuring_pattern_expected;
case ParsingContext.ArrayBindingElements: return Diagnostics.Array_element_destructuring_pattern_expected;
case ParsingContext.ArgumentExpressions: return Diagnostics.Argument_expression_expected;
case ParsingContext.ObjectLiteralMembers: return Diagnostics.Property_assignment_expected;
case ParsingContext.ArrayLiteralMembers: return Diagnostics.Expression_or_comma_expected;
case ParsingContext.Parameters: return Diagnostics.Parameter_declaration_expected;
case ParsingContext.TypeParameters: return Diagnostics.Type_parameter_declaration_expected;
case ParsingContext.TypeArguments: return Diagnostics.Type_argument_expected;
case ParsingContext.TupleElementTypes: return Diagnostics.Type_expected;
case ParsingContext.HeritageClauses: return Diagnostics.Unexpected_token_expected;
case ParsingContext.ImportOrExportSpecifiers: return Diagnostics.Identifier_expected;
}
};
export function modifierToFlag(token: SyntaxKind): NodeFlags {
switch (token) {
case SyntaxKind.StaticKeyword: return NodeFlags.Static;
case SyntaxKind.PublicKeyword: return NodeFlags.Public;
case SyntaxKind.ProtectedKeyword: return NodeFlags.Protected;
case SyntaxKind.PrivateKeyword: return NodeFlags.Private;
case SyntaxKind.ExportKeyword: return NodeFlags.Export;
case SyntaxKind.DeclareKeyword: return NodeFlags.Ambient;
case SyntaxKind.ConstKeyword: return NodeFlags.Const;
case SyntaxKind.DefaultKeyword: return NodeFlags.Default;
}
return 0;
}
function fixupParentReferences(sourceFile: SourceFile) {
// normally parent references are set during binding. However, for clients that only need
// a syntax tree, and no semantic features, then the binding process is an unnecessary
// overhead. This functions allows us to set all the parents, without all the expense of
// binding.
let parent: Node = sourceFile;
forEachChild(sourceFile, visitNode);
return;
function visitNode(n: Node): void {
// walk down setting parents that differ from the parent we think it should be. This
// allows us to quickly bail out of setting parents for subtrees during incremental
// parsing
if (n.parent !== parent) {
n.parent = parent;
let saveParent = parent;
parent = n;
forEachChild(n, visitNode);
parent = saveParent;
}
}
}
function shouldCheckNode(node: Node) {
switch (node.kind) {
case SyntaxKind.StringLiteral:
case SyntaxKind.NumericLiteral:
case SyntaxKind.Identifier:
return true;
}
return false;
}
function moveElementEntirelyPastChangeRange(element: IncrementalElement, isArray: boolean, delta: number, oldText: string, newText: string, aggressiveChecks: boolean) {
if (isArray) {
visitArray(<IncrementalNodeArray>element);
}
else {
visitNode(<IncrementalNode>element);
}
return;
function visitNode(node: IncrementalNode) {
if (aggressiveChecks && shouldCheckNode(node)) {
var text = oldText.substring(node.pos, node.end);
}
// Ditch any existing LS children we may have created. This way we can avoid
// moving them forward.
node._children = undefined;
node.pos += delta;
node.end += delta;
if (aggressiveChecks && shouldCheckNode(node)) {
Debug.assert(text === newText.substring(node.pos, node.end));
}
forEachChild(node, visitNode, visitArray);
checkNodePositions(node, aggressiveChecks);
}
function visitArray(array: IncrementalNodeArray) {
array._children = undefined;
array.pos += delta;
array.end += delta;
for (let node of array) {
visitNode(node);
}
}
}
function adjustIntersectingElement(element: IncrementalElement, changeStart: number, changeRangeOldEnd: number, changeRangeNewEnd: number, delta: number) {
Debug.assert(element.end >= changeStart, "Adjusting an element that was entirely before the change range");
Debug.assert(element.pos <= changeRangeOldEnd, "Adjusting an element that was entirely after the change range");
Debug.assert(element.pos <= element.end);
// We have an element that intersects the change range in some way. It may have its
// start, or its end (or both) in the changed range. We want to adjust any part
// that intersects such that the final tree is in a consistent state. i.e. all
// chlidren have spans within the span of their parent, and all siblings are ordered
// properly.
// We may need to update both the 'pos' and the 'end' of the element.
// If the 'pos' is before the start of the change, then we don't need to touch it.
// If it isn't, then the 'pos' must be inside the change. How we update it will
// depend if delta is positive or negative. If delta is positive then we have
// something like:
//
// -------------------AAA-----------------
// -------------------BBBCCCCCCC-----------------
//
// In this case, we consider any node that started in the change range to still be
// starting at the same position.
//
// however, if the delta is negative, then we instead have something like this:
//
// -------------------XXXYYYYYYY-----------------
// -------------------ZZZ-----------------
//
// In this case, any element that started in the 'X' range will keep its position.
// However any element htat started after that will have their pos adjusted to be
// at the end of the new range. i.e. any node that started in the 'Y' range will
// be adjusted to have their start at the end of the 'Z' range.
//
// The element will keep its position if possible. Or Move backward to the new-end
// if it's in the 'Y' range.
element.pos = Math.min(element.pos, changeRangeNewEnd);
// If the 'end' is after the change range, then we always adjust it by the delta
// amount. However, if the end is in the change range, then how we adjust it
// will depend on if delta is positive or negative. If delta is positive then we
// have something like:
//
// -------------------AAA-----------------
// -------------------BBBCCCCCCC-----------------
//
// In this case, we consider any node that ended inside the change range to keep its
// end position.
//
// however, if the delta is negative, then we instead have something like this:
//
// -------------------XXXYYYYYYY-----------------
// -------------------ZZZ-----------------
//
// In this case, any element that ended in the 'X' range will keep its position.
// However any element htat ended after that will have their pos adjusted to be
// at the end of the new range. i.e. any node that ended in the 'Y' range will
// be adjusted to have their end at the end of the 'Z' range.
if (element.end >= changeRangeOldEnd) {
// Element ends after the change range. Always adjust the end pos.
element.end += delta;
}
else {
// Element ends in the change range. The element will keep its position if
// possible. Or Move backward to the new-end if it's in the 'Y' range.
element.end = Math.min(element.end, changeRangeNewEnd);
}
Debug.assert(element.pos <= element.end);
if (element.parent) {
Debug.assert(element.pos >= element.parent.pos);
Debug.assert(element.end <= element.parent.end);
}
}
function checkNodePositions(node: Node, aggressiveChecks: boolean) {
if (aggressiveChecks) {
let pos = node.pos;
forEachChild(node, child => {
Debug.assert(child.pos >= pos);
pos = child.end;
});
Debug.assert(pos <= node.end);
}
}
function updateTokenPositionsAndMarkElements(
sourceFile: IncrementalNode,
changeStart: number,
changeRangeOldEnd: number,
changeRangeNewEnd: number,
delta: number,
oldText: string,
newText: string,
aggressiveChecks: boolean): void {
visitNode(sourceFile);
return;
function visitNode(child: IncrementalNode) {
Debug.assert(child.pos <= child.end);
if (child.pos > changeRangeOldEnd) {
// Node is entirely past the change range. We need to move both its pos and
// end, forward or backward appropriately.
moveElementEntirelyPastChangeRange(child, /*isArray:*/ false, delta, oldText, newText, aggressiveChecks);
return;
}
// Check if the element intersects the change range. If it does, then it is not
// reusable. Also, we'll need to recurse to see what constituent portions we may
// be able to use.
let fullEnd = child.end;
if (fullEnd >= changeStart) {
child.intersectsChange = true;
child._children = undefined;
// Adjust the pos or end (or both) of the intersecting element accordingly.
adjustIntersectingElement(child, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
forEachChild(child, visitNode, visitArray);
checkNodePositions(child, aggressiveChecks);
return;
}
// Otherwise, the node is entirely before the change range. No need to do anything with it.
Debug.assert(fullEnd < changeStart);
}
function visitArray(array: IncrementalNodeArray) {
Debug.assert(array.pos <= array.end);
if (array.pos > changeRangeOldEnd) {
// Array is entirely after the change range. We need to move it, and move any of
// its children.
moveElementEntirelyPastChangeRange(array, /*isArray:*/ true, delta, oldText, newText, aggressiveChecks);
return;
}
// Check if the element intersects the change range. If it does, then it is not
// reusable. Also, we'll need to recurse to see what constituent portions we may
// be able to use.
let fullEnd = array.end;
if (fullEnd >= changeStart) {
array.intersectsChange = true;
array._children = undefined;
// Adjust the pos or end (or both) of the intersecting array accordingly.
adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
for (let node of array) {
visitNode(node);
}
return;
}
// Otherwise, the array is entirely before the change range. No need to do anything with it.
Debug.assert(fullEnd < changeStart);
}
}
function extendToAffectedRange(sourceFile: SourceFile, changeRange: TextChangeRange): TextChangeRange {
// Consider the following code:
// void foo() { /; }
//
// If the text changes with an insertion of / just before the semicolon then we end up with:
// void foo() { //; }
//
// If we were to just use the changeRange a is, then we would not rescan the { token
// (as it does not intersect the actual original change range). Because an edit may
// change the token touching it, we actually need to look back *at least* one token so
// that the prior token sees that change.
let maxLookahead = 1;
let start = changeRange.span.start;
// the first iteration aligns us with the change start. subsequent iteration move us to
// the left by maxLookahead tokens. We only need to do this as long as we're not at the
// start of the tree.
for (let i = 0; start > 0 && i <= maxLookahead; i++) {
let nearestNode = findNearestNodeStartingBeforeOrAtPosition(sourceFile, start);
Debug.assert(nearestNode.pos <= start);
let position = nearestNode.pos;
start = Math.max(0, position - 1);
}
let finalSpan = createTextSpanFromBounds(start, textSpanEnd(changeRange.span));
let finalLength = changeRange.newLength + (changeRange.span.start - start);
return createTextChangeRange(finalSpan, finalLength);
}
function findNearestNodeStartingBeforeOrAtPosition(sourceFile: SourceFile, position: number): Node {
let bestResult: Node = sourceFile;
let lastNodeEntirelyBeforePosition: Node;
forEachChild(sourceFile, visit);
if (lastNodeEntirelyBeforePosition) {
let lastChildOfLastEntireNodeBeforePosition = getLastChild(lastNodeEntirelyBeforePosition);
if (lastChildOfLastEntireNodeBeforePosition.pos > bestResult.pos) {
bestResult = lastChildOfLastEntireNodeBeforePosition;
}
}
return bestResult;
function getLastChild(node: Node): Node {
while (true) {
let lastChild = getLastChildWorker(node);
if (lastChild) {
node = lastChild;
}
else {
return node;
}
}
}
function getLastChildWorker(node: Node): Node {
let last: Node = undefined;
forEachChild(node, child => {
if (nodeIsPresent(child)) {
last = child;
}
});
return last;
}
function visit(child: Node) {
if (nodeIsMissing(child)) {
// Missing nodes are effectively invisible to us. We never even consider them
// When trying to find the nearest node before us.
return;
}
// If the child intersects this position, then this node is currently the nearest
// node that starts before the position.
if (child.pos <= position) {
if (child.pos >= bestResult.pos) {
// This node starts before the position, and is closer to the position than
// the previous best node we found. It is now the new best node.
bestResult = child;
}
// Now, the node may overlap the position, or it may end entirely before the
// position. If it overlaps with the position, then either it, or one of its
// children must be the nearest node before the position. So we can just
// recurse into this child to see if we can find something better.
if (position < child.end) {
// The nearest node is either this child, or one of the children inside
// of it. We've already marked this child as the best so far. Recurse
// in case one of the children is better.
forEachChild(child, visit);
// Once we look at the children of this node, then there's no need to
// continue any further.
return true;
}
else {
Debug.assert(child.end <= position);
// The child ends entirely before this position. Say you have the following
// (where $ is the position)
//
// <complex expr 1> ? <complex expr 2> $ : <...> <...>
//
// We would want to find the nearest preceding node in "complex expr 2".
// To support that, we keep track of this node, and once we're done searching
// for a best node, we recurse down this node to see if we can find a good
// result in it.
//
// This approach allows us to quickly skip over nodes that are entirely
// before the position, while still allowing us to find any nodes in the
// last one that might be what we want.
lastNodeEntirelyBeforePosition = child;
}
}
else {
Debug.assert(child.pos > position);
// We're now at a node that is entirely past the position we're searching for.
// This node (and all following nodes) could never contribute to the result,
// so just skip them by returning 'true' here.
return true;
}
}
}
function checkChangeRange(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks: boolean) {
let oldText = sourceFile.text;
if (textChangeRange) {
Debug.assert((oldText.length - textChangeRange.span.length + textChangeRange.newLength) === newText.length);
if (aggressiveChecks || Debug.shouldAssert(AssertionLevel.VeryAggressive)) {
let oldTextPrefix = oldText.substr(0, textChangeRange.span.start);
let newTextPrefix = newText.substr(0, textChangeRange.span.start);
Debug.assert(oldTextPrefix === newTextPrefix);
let oldTextSuffix = oldText.substring(textSpanEnd(textChangeRange.span), oldText.length);
let newTextSuffix = newText.substring(textSpanEnd(textChangeRangeNewSpan(textChangeRange)), newText.length);
Debug.assert(oldTextSuffix === newTextSuffix);
}
}
}
// Produces a new SourceFile for the 'newText' provided. The 'textChangeRange' parameter
// indicates what changed between the 'text' that this SourceFile has and the 'newText'.
// The SourceFile will be created with the compiler attempting to reuse as many nodes from
// this file as possible.
//
// Note: this function mutates nodes from this SourceFile. That means any existing nodes
// from this SourceFile that are being held onto may change as a result (including
// becoming detached from any SourceFile). It is recommended that this SourceFile not
// be used once 'update' is called on it.
export function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile {
aggressiveChecks = aggressiveChecks || Debug.shouldAssert(AssertionLevel.Aggressive);
checkChangeRange(sourceFile, newText, textChangeRange, aggressiveChecks);
if (textChangeRangeIsUnchanged(textChangeRange)) {
// if the text didn't change, then we can just return our current source file as-is.
return sourceFile;
}
if (sourceFile.statements.length === 0) {
// If we don't have any statements in the current source file, then there's no real
// way to incrementally parse. So just do a full parse instead.
return parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, /*syntaxCursor*/ undefined, /*setNodeParents*/ true)
}
// Make sure we're not trying to incrementally update a source file more than once. Once
// we do an update the original source file is considered unusbale from that point onwards.
//
// This is because we do incremental parsing in-place. i.e. we take nodes from the old
// tree and give them new positions and parents. From that point on, trusting the old
// tree at all is not possible as far too much of it may violate invariants.
let incrementalSourceFile = <IncrementalNode><Node>sourceFile;
Debug.assert(!incrementalSourceFile.hasBeenIncrementallyParsed);
incrementalSourceFile.hasBeenIncrementallyParsed = true;
let oldText = sourceFile.text;
let syntaxCursor = createSyntaxCursor(sourceFile);
// Make the actual change larger so that we know to reparse anything whose lookahead
// might have intersected the change.
let changeRange = extendToAffectedRange(sourceFile, textChangeRange);
checkChangeRange(sourceFile, newText, changeRange, aggressiveChecks);
// Ensure that extending the affected range only moved the start of the change range
// earlier in the file.
Debug.assert(changeRange.span.start <= textChangeRange.span.start);
Debug.assert(textSpanEnd(changeRange.span) === textSpanEnd(textChangeRange.span));
Debug.assert(textSpanEnd(textChangeRangeNewSpan(changeRange)) === textSpanEnd(textChangeRangeNewSpan(textChangeRange)));
// The is the amount the nodes after the edit range need to be adjusted. It can be
// positive (if the edit added characters), negative (if the edit deleted characters)
// or zero (if this was a pure overwrite with nothing added/removed).
let delta = textChangeRangeNewSpan(changeRange).length - changeRange.span.length;
// If we added or removed characters during the edit, then we need to go and adjust all
// the nodes after the edit. Those nodes may move forward (if we inserted chars) or they
// may move backward (if we deleted chars).
//
// Doing this helps us out in two ways. First, it means that any nodes/tokens we want
// to reuse are already at the appropriate position in the new text. That way when we
// reuse them, we don't have to figure out if they need to be adjusted. Second, it makes
// it very easy to determine if we can reuse a node. If the node's position is at where
// we are in the text, then we can reuse it. Otherwise we can't. If the node's position
// is ahead of us, then we'll need to rescan tokens. If the node's position is behind
// us, then we'll need to skip it or crumble it as appropriate
//
// We will also adjust the positions of nodes that intersect the change range as well.
// By doing this, we ensure that all the positions in the old tree are consistent, not
// just the positions of nodes entirely before/after the change range. By being
// consistent, we can then easily map from positions to nodes in the old tree easily.
//
// Also, mark any syntax elements that intersect the changed span. We know, up front,
// that we cannot reuse these elements.
updateTokenPositionsAndMarkElements(incrementalSourceFile,
changeRange.span.start, textSpanEnd(changeRange.span), textSpanEnd(textChangeRangeNewSpan(changeRange)), delta, oldText, newText, aggressiveChecks);
// Now that we've set up our internal incremental state just proceed and parse the
// source file in the normal fashion. When possible the parser will retrieve and
// reuse nodes from the old tree.
//
// Note: passing in 'true' for setNodeParents is very important. When incrementally
// parsing, we will be reusing nodes from the old tree, and placing it into new
// parents. If we don't set the parents now, we'll end up with an observably
// inconsistent tree. Setting the parents on the new tree should be very fast. We
// will immediately bail out of walking any subtrees when we can see that their parents
// are already correct.
let result = parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, /* setParentNode */ true)
return result;
}
export function isEvalOrArgumentsIdentifier(node: Node): boolean {
return node.kind === SyntaxKind.Identifier &&
((<Identifier>node).text === "eval" || (<Identifier>node).text === "arguments");
}
/// Should be called only on prologue directives (isPrologueDirective(node) should be true)
function isUseStrictPrologueDirective(sourceFile: SourceFile, node: Node): boolean {
Debug.assert(isPrologueDirective(node));
let nodeText = getSourceTextOfNodeFromSourceFile(sourceFile,(<ExpressionStatement>node).expression);
// Note: the node text must be exactly "use strict" or 'use strict'. It is not ok for the
// string to contain unicode escapes (as per ES5).
return nodeText === '"use strict"' || nodeText === "'use strict'";
}
interface IncrementalElement extends TextRange {
parent?: Node;
intersectsChange: boolean
length?: number;
_children: Node[];
}
interface IncrementalNode extends Node, IncrementalElement {
hasBeenIncrementallyParsed: boolean
}
interface IncrementalNodeArray extends NodeArray<IncrementalNode>, IncrementalElement {
length: number
}
// Allows finding nodes in the source file at a certain position in an efficient manner.
// The implementation takes advantage of the calling pattern it knows the parser will
// make in order to optimize finding nodes as quickly as possible.
interface SyntaxCursor {
currentNode(position: number): IncrementalNode;
}
const enum InvalidPosition {
Value = -1
}
function createSyntaxCursor(sourceFile: SourceFile): SyntaxCursor {
let currentArray: NodeArray<Node> = sourceFile.statements;
let currentArrayIndex = 0;
Debug.assert(currentArrayIndex < currentArray.length);
let current = currentArray[currentArrayIndex];
let lastQueriedPosition = InvalidPosition.Value;
return {
currentNode(position: number) {
// Only compute the current node if the position is different than the last time
// we were asked. The parser commonly asks for the node at the same position
// twice. Once to know if can read an appropriate list element at a certain point,
// and then to actually read and consume the node.
if (position !== lastQueriedPosition) {
// Much of the time the parser will need the very next node in the array that
// we just returned a node from.So just simply check for that case and move
// forward in the array instead of searching for the node again.
if (current && current.end === position && currentArrayIndex < (currentArray.length - 1)) {
currentArrayIndex++;
current = currentArray[currentArrayIndex];
}
// If we don't have a node, or the node we have isn't in the right position,
// then try to find a viable node at the position requested.
if (!current || current.pos !== position) {
findHighestListElementThatStartsAtPosition(position);
}
}
// Cache this query so that we don't do any extra work if the parser calls back
// into us. Note: this is very common as the parser will make pairs of calls like
// 'isListElement -> parseListElement'. If we were unable to find a node when
// called with 'isListElement', we don't want to redo the work when parseListElement
// is called immediately after.
lastQueriedPosition = position;
// Either we don'd have a node, or we have a node at the position being asked for.
Debug.assert(!current || current.pos === position);
return <IncrementalNode>current;
}
};
// Finds the highest element in the tree we can find that starts at the provided position.
// The element must be a direct child of some node list in the tree. This way after we
// return it, we can easily return its next sibling in the list.
function findHighestListElementThatStartsAtPosition(position: number) {
// Clear out any cached state about the last node we found.
currentArray = undefined;
currentArrayIndex = InvalidPosition.Value;
current = undefined;
// Recurse into the source file to find the highest node at this position.
forEachChild(sourceFile, visitNode, visitArray);
return;
function visitNode(node: Node) {
if (position >= node.pos && position < node.end) {
// Position was within this node. Keep searching deeper to find the node.
forEachChild(node, visitNode, visitArray);
// don't procede any futher in the search.
return true;
}
// position wasn't in this node, have to keep searching.
return false;
}
function visitArray(array: NodeArray<Node>) {
if (position >= array.pos && position < array.end) {
// position was in this array. Search through this array to see if we find a
// viable element.
for (let i = 0, n = array.length; i < n; i++) {
let child = array[i];
if (child) {
if (child.pos === position) {
// Found the right node. We're done.
currentArray = array;
currentArrayIndex = i;
current = child;
return true;
}
else {
if (child.pos < position && position < child.end) {
// Position in somewhere within this child. Search in it and
// stop searching in this array.
forEachChild(child, visitNode, visitArray);
return true;
}
}
}
}
}
// position wasn't in this array, have to keep searching.
return false;
}
}
}