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syntaxElement.ts
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///<reference path='references.ts' />
module TypeScript {
// True if there is only a single instance of this element (and thus can be reused in many
// places in a syntax tree). Examples of this include our empty lists. Because empty
// lists can be found all over the tree, we want to save on memory by using this single
// instance instead of creating new objects for each case. Note: because of this, shared
// nodes don't have positions or parents.
export function isShared(element: ISyntaxElement): boolean {
var kind = element.kind();
return (kind === SyntaxKind.List || kind === SyntaxKind.SeparatedList) && (<ISyntaxNodeOrToken[]>element).length === 0;
}
export function childCount(element: ISyntaxElement): number {
var kind = element.kind();
if (kind === SyntaxKind.List) {
return (<ISyntaxNodeOrToken[]>element).length;
}
else if (kind === SyntaxKind.SeparatedList) {
return (<ISyntaxNodeOrToken[]>element).length + (<ISyntaxNodeOrToken[]>element).separators.length;
}
else if (kind >= SyntaxKind.FirstToken && kind <= SyntaxKind.LastToken) {
return 0;
}
else {
return nodeMetadata[kind].length;
}
}
export function childAt(element: ISyntaxElement, index: number): ISyntaxElement {
var kind = element.kind();
if (kind === SyntaxKind.List) {
return (<ISyntaxNodeOrToken[]>element)[index];
}
else if (kind === SyntaxKind.SeparatedList) {
return (index % 2 === 0) ? (<ISyntaxNodeOrToken[]>element)[index / 2] : (<ISyntaxNodeOrToken[]>element).separators[(index - 1) / 2];
}
else {
// Debug.assert(isNode(element));
return (<any>element)[nodeMetadata[element.kind()][index]];
}
}
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 null;
}
export function parsedInStrictMode(node: ISyntaxNode): boolean {
var info = node.data;
if (info === undefined) {
return false;
}
return (info & SyntaxConstants.NodeParsedInStrictModeMask) !== 0;
}
export function previousToken(token: ISyntaxToken, includeSkippedTokens: boolean = false): ISyntaxToken {
if (includeSkippedTokens) {
var triviaList = token.leadingTrivia();
if (triviaList && triviaList.hasSkippedToken()) {
var currentTriviaEndPosition = TypeScript.start(token);
for (var i = triviaList.count() - 1; i >= 0; i--) {
var trivia = triviaList.syntaxTriviaAt(i);
if (trivia.isSkippedToken()) {
return trivia.skippedToken();
}
currentTriviaEndPosition -= trivia.fullWidth();
}
}
}
var start = token.fullStart();
if (start === 0) {
return null;
}
return findToken(syntaxTree(token).sourceUnit(), start - 1, includeSkippedTokens);
}
/**
* 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(element: ISyntaxElement, position: number, includeSkippedTokens: boolean = false): ISyntaxToken {
var endOfFileToken = tryGetEndOfFileAt(element, position);
if (endOfFileToken !== null) {
return endOfFileToken;
}
if (position < 0 || position >= fullWidth(element)) {
throw Errors.argumentOutOfRange("position");
}
var positionedToken = findTokenWorker(element, position);
if (includeSkippedTokens) {
return findSkippedTokenInPositionedToken(positionedToken, position) || positionedToken;
}
// Could not find a better match
return positionedToken;
}
export function findSkippedTokenInPositionedToken(positionedToken: ISyntaxToken, position: number): ISyntaxToken {
var positionInLeadingTriviaList = (position < start(positionedToken));
return findSkippedTokenInTriviaList(positionedToken, position, /*lookInLeadingTriviaList*/ positionInLeadingTriviaList);
}
export function findSkippedTokenInLeadingTriviaList(positionedToken: ISyntaxToken, position: number): ISyntaxToken {
return findSkippedTokenInTriviaList(positionedToken, position, /*lookInLeadingTriviaList*/ true);
}
export function findSkippedTokenInTrailingTriviaList(positionedToken: ISyntaxToken, position: number): ISyntaxToken {
return findSkippedTokenInTriviaList(positionedToken, position, /*lookInLeadingTriviaList*/ false);
}
function findSkippedTokenInTriviaList(positionedToken: ISyntaxToken, position: number, lookInLeadingTriviaList: boolean): ISyntaxToken {
var triviaList: TypeScript.ISyntaxTriviaList = null;
var fullStart: number;
if (lookInLeadingTriviaList) {
triviaList = positionedToken.leadingTrivia();
fullStart = positionedToken.fullStart();
}
else {
triviaList = positionedToken.trailingTrivia();
fullStart = end(positionedToken);
}
if (triviaList && triviaList.hasSkippedToken()) {
for (var i = 0, n = triviaList.count(); i < n; i++) {
var trivia = triviaList.syntaxTriviaAt(i);
var triviaWidth = trivia.fullWidth();
if (trivia.isSkippedToken() && position >= fullStart && position <= fullStart + triviaWidth) {
return trivia.skippedToken();
}
fullStart += triviaWidth;
}
}
return null;
}
function findTokenWorker(element: ISyntaxElement, position: number): ISyntaxToken {
// Debug.assert(position >= 0 && position < this.fullWidth());
if (isToken(element)) {
Debug.assert(fullWidth(element) > 0);
return <ISyntaxToken>element;
}
if (isShared(element)) {
// This should never have been called on this element. It has a 0 width, so the client
// should have skipped over this.
throw Errors.invalidOperation();
}
// Consider: we could use a binary search here to find the child more quickly.
for (var i = 0, n = childCount(element); i < n; i++) {
var child = childAt(element, i);
if (child !== null) {
var childFullWidth = fullWidth(child);
if (childFullWidth > 0) {
var childFullStart = fullStart(child);
if (position >= childFullStart) {
var childFullEnd = childFullStart + childFullWidth;
if (position < childFullEnd) {
return findTokenWorker(child, position);
}
}
}
}
}
throw Errors.invalidOperation();
}
function tryGetEndOfFileAt(element: ISyntaxElement, position: number): ISyntaxToken {
if (element.kind() === SyntaxKind.SourceUnit && position === fullWidth(element)) {
var sourceUnit = <SourceUnitSyntax>element;
return sourceUnit.endOfFileToken;
}
return null;
}
export function nextToken(token: ISyntaxToken, text?: ISimpleText, includeSkippedTokens: boolean = false): ISyntaxToken {
if (token.kind() === SyntaxKind.EndOfFileToken) {
return null;
}
if (includeSkippedTokens) {
var triviaList = token.trailingTrivia(text);
if (triviaList && triviaList.hasSkippedToken()) {
for (var i = 0, n = triviaList.count(); i < n; i++) {
var trivia = triviaList.syntaxTriviaAt(i);
if (trivia.isSkippedToken()) {
return trivia.skippedToken();
}
}
}
}
return findToken(syntaxTree(token).sourceUnit(), fullEnd(token), includeSkippedTokens);
}
export function isNode(element: ISyntaxElement): boolean {
if (element !== null) {
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 !== null) {
return isTokenKind(element.kind());
}
return false;
}
export function isList(element: ISyntaxElement): boolean {
return element !== null && element.kind() === SyntaxKind.List;
}
export function isSeparatedList(element: ISyntaxElement): boolean {
return element !== null && element.kind() === SyntaxKind.SeparatedList;
}
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 trailingTriviaWidth(element: ISyntaxElement, text?: ISimpleText): number {
var token = lastToken(element);
return token ? token.trailingTriviaWidth(text) : 0;
}
export function firstToken(element: ISyntaxElement): ISyntaxToken {
if (element) {
var kind = element.kind();
if (isTokenKind(kind)) {
return fullWidth(element) > 0 || element.kind() === SyntaxKind.EndOfFileToken ? <ISyntaxToken>element : null;
}
if (kind === SyntaxKind.List) {
var array = <ISyntaxNodeOrToken[]>element;
for (var i = 0, n = array.length; i < n; i++) {
var token = firstToken(array[i]);
if (token) {
return token;
}
}
}
else if (kind === SyntaxKind.SeparatedList) {
var array = <ISyntaxNodeOrToken[]>element;
var separators = array.separators;
for (var i = 0, n = array.length + separators.length; i < n; i++) {
var token = firstToken(i % 2 === 0 ? array[i / 2] : separators[(i - 1) / 2]);
if (token) {
return token;
}
}
}
else {
var metadata = nodeMetadata[kind];
for (var i = 0, n = metadata.length; i < n; i++) {
var child = (<any>element)[metadata[i]];
var token = firstToken(child);
if (token) {
return token;
}
}
if (element.kind() === SyntaxKind.SourceUnit) {
return (<SourceUnitSyntax>element).endOfFileToken;
}
}
}
return null;
}
export function lastToken(element: ISyntaxElement): ISyntaxToken {
if (isToken(element)) {
return fullWidth(element) > 0 || element.kind() === SyntaxKind.EndOfFileToken ? <ISyntaxToken>element : null;
}
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 !== null) {
var token = lastToken(child);
if (token) {
return token;
}
}
}
return null;
}
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();
}
if (isShared(element)) {
return 0;
}
var info = data(element);
return info >>> SyntaxConstants.NodeFullWidthShift;
}
export function isIncrementallyUnusable(element: ISyntaxElement): boolean {
if (isToken(element)) {
return (<ISyntaxToken>element).isIncrementallyUnusable();
}
if (isShared(element)) {
// All shared lists are reusable.
return false;
}
return (data(element) & SyntaxConstants.NodeIncrementallyUnusableMask) !== 0;
}
function data(element: ISyntaxElement): number {
Debug.assert(isNode(element) || isList(element) || isSeparatedList(element));
// Lists and nodes all have a 'data' element.
var dataElement = <{ data: number }><any>element;
var info = dataElement.data;
if (info === undefined) {
info = 0;
}
if ((info & SyntaxConstants.NodeDataComputed) === 0) {
info |= computeData(element);
dataElement.data = info;
}
return info;
}
function computeData(element: ISyntaxElement): number {
var slotCount = childCount(element);
var fullWidth = 0;
// 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 = childAt(element, i);
if (child) {
fullWidth += TypeScript.fullWidth(child);
isIncrementallyUnusable = isIncrementallyUnusable || TypeScript.isIncrementallyUnusable(child);
}
}
return (fullWidth << SyntaxConstants.NodeFullWidthShift)
| (isIncrementallyUnusable ? SyntaxConstants.NodeIncrementallyUnusableMask : 0)
| SyntaxConstants.NodeDataComputed;
}
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 end(element: ISyntaxElement, text?: ISimpleText): number {
var token = isToken(element) ? <ISyntaxToken>element : lastToken(element);
return token ? fullEnd(token) - token.trailingTriviaWidth(text) : -1;
}
export function width(element: ISyntaxElement, text?: ISimpleText): number {
if (isToken(element)) {
return (<ISyntaxToken>element).text().length;
}
return fullWidth(element) - leadingTriviaWidth(element, text) - trailingTriviaWidth(element, text);
}
export function fullEnd(element: ISyntaxElement): number {
return fullStart(element) + fullWidth(element);
}
export function existsNewLineBetweenTokens(token1: ISyntaxToken, token2: ISyntaxToken, text: ISimpleText) {
if (token1 === token2) {
return false;
}
if (token1 === null || token2 === null) {
return true;
}
var lineMap = text.lineMap();
return lineMap.getLineNumberFromPosition(end(token1, text)) !== lineMap.getLineNumberFromPosition(start(token2, text));
}
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 {
}
export interface IStatementSyntax extends IModuleElementSyntax {
_statementBrand: any;
}
export interface ITypeMemberSyntax extends ISyntaxNode {
}
export interface IClassElementSyntax extends ISyntaxNode {
}
export interface IMemberDeclarationSyntax extends IClassElementSyntax {
}
export interface IPropertyAssignmentSyntax extends IClassElementSyntax {
}
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 {
}
}