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syntaxElement.ts
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///<reference path='references.ts' />
module TypeScript {
export function syntaxTree(element: ISyntaxElement): SyntaxTree {
if (element) {
// Debug.assert(!isShared(element));
while (element) {
if (element.kind === SyntaxKind.SourceUnit) {
return (<SourceUnitSyntax>element).syntaxTree;
}
element = element.parent;
}
}
return undefined;
}
export function parserContextFlags(node: ISyntaxNode): ParserContextFlags {
var info = node.__data;
if (info === undefined) {
return 0;
}
return info & ParserContextFlags.Mask;
}
export function parsedInStrictModeContext(node: ISyntaxNode): boolean {
return (parserContextFlags(node) & ParserContextFlags.StrictMode) !== 0;
}
export function parsedInDisallowInContext(node: ISyntaxNode): boolean {
return (parserContextFlags(node) & ParserContextFlags.DisallowIn) !== 0;
}
export function parsedInYieldContext(node: ISyntaxNode): boolean {
return (parserContextFlags(node) & ParserContextFlags.Yield) !== 0;
}
export function parsedInGeneratorParameterContext(node: ISyntaxNode): boolean {
return (parserContextFlags(node) & ParserContextFlags.GeneratorParameter) !== 0;
}
export function parsedInAsyncContext(node: ISyntaxNode): boolean {
return (parserContextFlags(node) & ParserContextFlags.Async) !== 0;
}
export function previousToken(token: ISyntaxToken): ISyntaxToken {
var start = token.fullStart();
if (start === 0) {
return undefined;
}
return findToken(syntaxTree(token).sourceUnit(), start - 1);
}
/**
* Finds a token according to the following rules:
* 1) If position matches the End of the node/s FullSpan and the node is SourceUnitSyntax,
* then the EOF token is returned.
*
* 2) If node.FullSpan.Contains(position) then the token that contains given position is
* returned.
*
* 3) Otherwise an ArgumentOutOfRangeException is thrown
*
* Note: findToken will always return a non-missing token with width greater than or equal to
* 1 (except for EOF). Empty tokens synthesized by the parser are never returned.
*/
export function findToken(sourceUnit: SourceUnitSyntax, position: number): ISyntaxToken {
if (position < 0) {
throw Errors.argumentOutOfRange("position");
}
var token = findTokenInNodeOrToken(sourceUnit, 0, position);
if (token) {
Debug.assert(token.fullWidth() > 0);
return token;
}
if (position === fullWidth(sourceUnit)) {
return sourceUnit.endOfFileToken;
}
if (position > fullWidth(sourceUnit)) {
throw Errors.argumentOutOfRange("position");
}
throw Errors.invalidOperation();
}
function findTokenWorker(element: ISyntaxElement, elementPosition: number, position: number): ISyntaxToken {
if (isList(element)) {
return findTokenInList(<ISyntaxNodeOrToken[]>element, elementPosition, position);
}
else {
return findTokenInNodeOrToken(<ISyntaxNodeOrToken>element, elementPosition, position);
}
}
function findTokenInList(list: ISyntaxNodeOrToken[], elementPosition: number, position: number): ISyntaxToken {
for (var i = 0, n = list.length; i < n; i++) {
var child = list[i];
var childFullWidth = fullWidth(child);
var elementEndPosition = elementPosition + childFullWidth;
if (position < elementEndPosition) {
return findTokenWorker(child, elementPosition, position);
}
elementPosition = elementEndPosition;
}
return undefined;
}
function findTokenInNodeOrToken(nodeOrToken: ISyntaxNodeOrToken, elementPosition: number, position: number): ISyntaxToken {
if (isToken(nodeOrToken)) {
return <ISyntaxToken>nodeOrToken;
}
for (var i = 0, n = childCount(nodeOrToken); i < n; i++) {
var child = nodeOrToken.childAt(i);
if (child) {
var childFullWidth = fullWidth(child);
var elementEndPosition = elementPosition + childFullWidth;
if (position < elementEndPosition) {
return findTokenWorker(child, elementPosition, position);
}
elementPosition = elementEndPosition;
}
}
return undefined;
}
function tryGetEndOfFileAt(element: ISyntaxElement, position: number): ISyntaxToken {
if (element.kind === SyntaxKind.SourceUnit && position === fullWidth(element)) {
var sourceUnit = <SourceUnitSyntax>element;
return sourceUnit.endOfFileToken;
}
return undefined;
}
export function nextToken(token: ISyntaxToken, text?: ISimpleText): ISyntaxToken {
if (token.kind === SyntaxKind.EndOfFileToken) {
return undefined;
}
return findToken(syntaxTree(token).sourceUnit(), fullEnd(token));
}
export function isNode(element: ISyntaxElement): boolean {
if (element) {
var kind = element.kind;
return kind >= SyntaxKind.FirstNode && kind <= SyntaxKind.LastNode;
}
return false;
}
function isTokenKind(kind: SyntaxKind) {
return kind >= SyntaxKind.FirstToken && kind <= SyntaxKind.LastToken
}
export function isToken(element: ISyntaxElement): boolean {
if (element) {
return isTokenKind(element.kind);
}
return false;
}
export function isList(element: ISyntaxElement): boolean {
return element instanceof Array;
}
export function syntaxID(element: ISyntaxElement): number {
//if (isShared(element)) {
// throw Errors.invalidOperation("Should not use shared syntax element as a key.");
//}
var obj = <any>element;
if (obj._syntaxID === undefined) {
obj._syntaxID = TypeScript.Syntax._nextSyntaxID++;
}
return obj._syntaxID;
}
function collectTextElements(element: ISyntaxElement, elements: string[], text: ISimpleText): void {
if (element) {
if (isToken(element)) {
elements.push((<ISyntaxToken>element).fullText(text));
}
else {
for (var i = 0, n = childCount(element); i < n; i++) {
collectTextElements(childAt(element, i), elements, text);
}
}
}
}
export function fullText(element: ISyntaxElement, text?: ISimpleText): string {
if (isToken(element)) {
return (<ISyntaxToken>element).fullText(text);
}
var elements: string[] = [];
collectTextElements(element, elements, text);
return elements.join("");
}
export function leadingTriviaWidth(element: ISyntaxElement, text?: ISimpleText): number {
var token = firstToken(element);
return token ? token.leadingTriviaWidth(text) : 0;
}
export function firstToken(element: ISyntaxElement): ISyntaxToken {
if (element) {
var kind = element.kind;
if (isTokenKind(kind)) {
return (<ISyntaxToken>element).fullWidth() > 0 || kind === SyntaxKind.EndOfFileToken ? <ISyntaxToken>element : undefined;
}
for (var i = 0, n = childCount(element); i < n; i++) {
var token = firstToken(childAt(element, i));
if (token) {
return token;
}
}
}
return undefined;
}
export function lastToken(element: ISyntaxElement): ISyntaxToken {
if (isToken(element)) {
return fullWidth(element) > 0 || element.kind === SyntaxKind.EndOfFileToken ? <ISyntaxToken>element : undefined;
}
if (element.kind === SyntaxKind.SourceUnit) {
return (<SourceUnitSyntax>element).endOfFileToken;
}
for (var i = childCount(element) - 1; i >= 0; i--) {
var child = childAt(element, i);
if (child) {
var token = lastToken(child);
if (token) {
return token;
}
}
}
return undefined;
}
export function fullStart(element: ISyntaxElement): number {
// Debug.assert(!isShared(element));
var token = isToken(element) ? <ISyntaxToken>element : firstToken(element);
return token ? token.fullStart() : -1;
}
export function fullWidth(element: ISyntaxElement): number {
if (isToken(element)) {
return (<ISyntaxToken>element).fullWidth();
}
var info = data(element);
return (info / SyntaxNodeConstants.FullWidthShift) | 0;
}
export function isIncrementallyUnusable(element: ISyntaxElement): boolean {
if (isToken(element)) {
return (<ISyntaxToken>element).isIncrementallyUnusable();
}
return (data(element) & SyntaxNodeConstants.IncrementallyUnusableMask) !== 0;
}
function data(element: ISyntaxElement): number {
// Debug.assert(isNode(element) || isList(element));
// Lists and nodes all have a 'data' element.
var dataElement = <ISyntaxNode>element;
var info = dataElement.__data;
if (info === undefined) {
info = 0;
}
if ((info & SyntaxNodeConstants.DataComputed) === 0) {
info += computeData(element);
dataElement.__data = info;
}
return info;
}
function combineData(fullWidth: number, isIncrementallyUnusable: boolean) {
return (fullWidth * SyntaxNodeConstants.FullWidthShift) +
(isIncrementallyUnusable ? SyntaxNodeConstants.IncrementallyUnusableMask : 0) +
SyntaxNodeConstants.DataComputed;
}
function listComputeData(list: ISyntaxNodeOrToken[]): number {
var fullWidth = 0;
var isIncrementallyUnusable = false;
for (var i = 0, n = list.length; i < n; i++) {
var child: ISyntaxElement = list[i];
fullWidth += TypeScript.fullWidth(child);
isIncrementallyUnusable = isIncrementallyUnusable || TypeScript.isIncrementallyUnusable(child);
}
return combineData(fullWidth, isIncrementallyUnusable);
}
function computeData(element: ISyntaxElement): number {
if (isList(element)) {
return listComputeData(<ISyntaxNodeOrToken[]>element);
}
else {
return nodeOrTokenComputeData(<ISyntaxNodeOrToken>element);
}
}
function nodeOrTokenComputeData(nodeOrToken: ISyntaxNodeOrToken) {
var fullWidth = 0;
var slotCount = nodeOrToken.childCount;
// If we have no children (like an OmmittedExpressionSyntax), we're automatically not reusable.
var isIncrementallyUnusable = slotCount === 0;
for (var i = 0, n = slotCount; i < n; i++) {
var child = nodeOrToken.childAt(i);
if (child) {
fullWidth += TypeScript.fullWidth(child);
isIncrementallyUnusable = isIncrementallyUnusable || TypeScript.isIncrementallyUnusable(child);
}
}
return combineData(fullWidth, isIncrementallyUnusable);
}
export function start(element: ISyntaxElement, text?: ISimpleText): number {
var token = isToken(element) ? <ISyntaxToken>element : firstToken(element);
return token ? token.fullStart() + token.leadingTriviaWidth(text) : -1;
}
export function width(element: ISyntaxElement, text?: ISimpleText): number {
if (isToken(element)) {
return (<ISyntaxToken>element).text().length;
}
return fullWidth(element) - leadingTriviaWidth(element, text);
}
export function fullEnd(element: ISyntaxElement): number {
return fullStart(element) + fullWidth(element);
}
export interface ISyntaxElement {
kind: SyntaxKind;
parent: ISyntaxElement;
}
export interface ISyntaxNode extends ISyntaxNodeOrToken {
__data: number;
}
export interface IModuleReferenceSyntax extends ISyntaxNode {
_moduleReferenceBrand: any;
}
export interface IModuleElementSyntax extends ISyntaxNode {
_moduleElementBrand: any;
}
export interface IStatementSyntax extends IModuleElementSyntax {
_statementBrand: any;
}
export interface ITypeMemberSyntax extends ISyntaxNode {
_typeMemberBrand: any;
}
export interface IClassElementSyntax extends ISyntaxNode {
_classElementBrand: any;
}
export interface IMemberDeclarationSyntax extends IClassElementSyntax {
_memberDeclarationBrand: any;
}
export interface IPropertyAssignmentSyntax extends ISyntaxNodeOrToken {
_propertyAssignmentBrand: any;
}
export interface IAccessorSyntax extends IPropertyAssignmentSyntax, IMemberDeclarationSyntax {
_accessorBrand: any;
modifiers: ISyntaxToken[];
propertyName: IPropertyNameSyntax;
callSignature: CallSignatureSyntax;
body: BlockSyntax | ExpressionBody | ISyntaxToken;
}
export interface ISwitchClauseSyntax extends ISyntaxNode {
_switchClauseBrand: any;
statements: IStatementSyntax[];
}
export interface IExpressionSyntax extends ISyntaxNodeOrToken {
_expressionBrand: any;
}
export interface IUnaryExpressionSyntax extends IExpressionSyntax {
_unaryExpressionBrand: any;
}
export interface IPostfixExpressionSyntax extends IUnaryExpressionSyntax {
_postfixExpressionBrand: any;
}
export interface ILeftHandSideExpressionSyntax extends IPostfixExpressionSyntax {
_leftHandSideExpressionBrand: any;
}
export interface IMemberExpressionSyntax extends ILeftHandSideExpressionSyntax {
_memberExpressionBrand: any;
}
export interface ICallExpressionSyntax extends ILeftHandSideExpressionSyntax {
_callExpressionBrand: any;
expression: IExpressionSyntax;
}
export interface IPrimaryExpressionSyntax extends IMemberExpressionSyntax {
_primaryExpressionBrand: any;
}
export interface ITypeSyntax extends ISyntaxNodeOrToken {
_typeBrand: any;
}
export interface INameSyntax extends ITypeSyntax {
_nameBrand: any;
}
export interface IPropertyNameSyntax extends ISyntaxNodeOrToken {
_propertyNameBrand: any;
}
}