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Copy pathsyntax.ts
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234 lines (193 loc) · 9.76 KB
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///<reference path='references.ts' />
module TypeScript.Syntax {
export var _nextSyntaxID: number = 1;
export function nodeHasSkippedOrMissingTokens(node: ISyntaxNode): boolean {
for (var i = 0; i < childCount(node); i++) {
var child = childAt(node, i);
if (isToken(child)) {
var token = <ISyntaxToken>child;
// If a token is skipped, return true. Or if it is a missing token. The only empty token that is not missing is EOF
if (token.hasSkippedToken() || (width(token) === 0 && token.kind !== SyntaxKind.EndOfFileToken)) {
return true;
}
}
}
return false;
}
export function isUnterminatedStringLiteral(token: ISyntaxToken): boolean {
if (token && token.kind === SyntaxKind.StringLiteral) {
var text = token.text();
return text.length < 2 || text.charCodeAt(text.length - 1) !== text.charCodeAt(0);
}
return false;
}
export function isUnterminatedMultilineCommentTrivia(trivia: ISyntaxTrivia): boolean {
if (trivia && trivia.kind() === SyntaxKind.MultiLineCommentTrivia) {
var text = trivia.fullText();
return text.length < 4 || text.substring(text.length - 2) !== "*/";
}
return false;
}
export function isEntirelyInsideCommentTrivia(trivia: ISyntaxTrivia, fullStart: number, position: number): boolean {
if (trivia && trivia.isComment() && position > fullStart) {
var end = fullStart + trivia.fullWidth();
if (position < end) {
return true;
}
else if (position === end) {
return trivia.kind() === SyntaxKind.SingleLineCommentTrivia || isUnterminatedMultilineCommentTrivia(trivia);
}
}
return false;
}
export function isEntirelyInsideComment(sourceUnit: SourceUnitSyntax, position: number): boolean {
var positionedToken = findToken(sourceUnit, position);
var fullStart = positionedToken.fullStart();
var triviaList: ISyntaxTriviaList = undefined;
var lastTriviaBeforeToken: ISyntaxTrivia = undefined;
if (positionedToken.kind === SyntaxKind.EndOfFileToken) {
// Check if the trivia is leading on the EndOfFile token
if (positionedToken.hasLeadingTrivia()) {
triviaList = positionedToken.leadingTrivia();
}
// Or trailing on the previous token
else {
positionedToken = previousToken(positionedToken);
if (positionedToken) {
if (positionedToken && positionedToken.hasTrailingTrivia()) {
triviaList = positionedToken.trailingTrivia();
fullStart = end(positionedToken);
}
}
}
}
else {
if (position <= (fullStart + positionedToken.leadingTriviaWidth())) {
triviaList = positionedToken.leadingTrivia();
}
else if (position >= (fullStart + width(positionedToken))) {
triviaList = positionedToken.trailingTrivia();
fullStart = end(positionedToken);
}
}
if (triviaList) {
// Try to find the trivia matching the position
for (var i = 0, n = triviaList.count(); i < n; i++) {
var trivia = triviaList.syntaxTriviaAt(i);
if (position <= fullStart) {
// Moved passed the trivia we need
break;
}
else if (position <= fullStart + trivia.fullWidth() && trivia.isComment()) {
// Found the comment trivia we were looking for
lastTriviaBeforeToken = trivia;
break;
}
fullStart += trivia.fullWidth();
}
}
return lastTriviaBeforeToken && isEntirelyInsideCommentTrivia(lastTriviaBeforeToken, fullStart, position);
}
export function isEntirelyInStringOrRegularExpressionLiteral(sourceUnit: SourceUnitSyntax, position: number): boolean {
var positionedToken = findToken(sourceUnit, position);
if (positionedToken) {
if (positionedToken.kind === SyntaxKind.EndOfFileToken) {
// EndOfFile token, enusre it did not follow an unterminated string literal
positionedToken = previousToken(positionedToken);
return positionedToken && positionedToken.trailingTriviaWidth() === 0 && isUnterminatedStringLiteral(positionedToken);
}
else if (position > start(positionedToken)) {
// Ensure position falls enterily within the literal if it is terminated, or the line if it is not
return (position < end(positionedToken) && (positionedToken.kind === TypeScript.SyntaxKind.StringLiteral || positionedToken.kind === TypeScript.SyntaxKind.RegularExpressionLiteral)) ||
(position <= end(positionedToken) && isUnterminatedStringLiteral(positionedToken));
}
}
return false;
}
export function getAncestorOfKind(positionedToken: ISyntaxElement, kind: SyntaxKind): ISyntaxElement {
while (positionedToken && positionedToken.parent) {
if (positionedToken.parent.kind === kind) {
return positionedToken.parent;
}
positionedToken = positionedToken.parent;
}
return undefined;
}
export function hasAncestorOfKind(positionedToken: ISyntaxElement, kind: SyntaxKind): boolean {
return !!getAncestorOfKind(positionedToken, kind);
}
export function isIntegerLiteral(expression: IExpressionSyntax): boolean {
if (expression) {
switch (expression.kind) {
case SyntaxKind.PrefixUnaryExpression:
var prefixExpr = <PrefixUnaryExpressionSyntax>expression;
if (prefixExpr.operatorToken.kind == SyntaxKind.PlusToken || prefixExpr.operatorToken.kind === SyntaxKind.MinusToken) {
// Note: if there is a + or - sign, we can only allow a normal integer following
// (and not a hex integer). i.e. -0xA is a legal expression, but it is not a
// *literal*.
expression = prefixExpr.operand;
return isToken(expression) && IntegerUtilities.isInteger((<ISyntaxToken>expression).text());
}
return false;
case SyntaxKind.NumericLiteral:
// If it doesn't have a + or -, then either an integer literal or a hex literal
// is acceptable.
var text = (<ISyntaxToken> expression).text();
return IntegerUtilities.isInteger(text) || IntegerUtilities.isHexInteger(text);
}
}
return false;
}
export function containingNode(element: ISyntaxElement): ISyntaxNode {
var current = element.parent;
while (current && !isNode(current)) {
current = current.parent;
}
return <ISyntaxNode>current;
}
export function findTokenOnLeft(sourceUnit: SourceUnitSyntax, position: number): ISyntaxToken {
var positionedToken = findToken(sourceUnit, position);
var _start = start(positionedToken);
// Position better fall within this token.
// Debug.assert(position >= positionedToken.fullStart());
// Debug.assert(position < positionedToken.fullEnd() || positionedToken.token().tokenKind === SyntaxKind.EndOfFileToken);
// if position is after the start of the token, then this token is the token on the left.
if (position > _start) {
return positionedToken;
}
// we're in the trivia before the start of the token. Need to return the previous token.
if (positionedToken.fullStart() === 0) {
// Already on the first token. Nothing before us.
return undefined;
}
return previousToken(positionedToken);
}
export function findCompleteTokenOnLeft(sourceUnit: SourceUnitSyntax, position: number): ISyntaxToken {
var positionedToken = findToken(sourceUnit, position);
// Position better fall within this token.
// Debug.assert(position >= positionedToken.fullStart());
// Debug.assert(position < positionedToken.fullEnd() || positionedToken.token().tokenKind === SyntaxKind.EndOfFileToken);
// if position is after the end of the token, then this token is the token on the left.
if (width(positionedToken) > 0 && position >= end(positionedToken)) {
return positionedToken;
}
return previousToken(positionedToken);
}
export function firstTokenInLineContainingPosition(syntaxTree: SyntaxTree, position: number): ISyntaxToken {
var current = findToken(syntaxTree.sourceUnit(), position);
while (true) {
if (isFirstTokenInLine(current, syntaxTree.lineMap())) {
break;
}
current = previousToken(current);
}
return current;
}
function isFirstTokenInLine(token: ISyntaxToken, lineMap: LineMap): boolean {
var _previousToken = previousToken(token);
if (_previousToken === undefined) {
return true;
}
return lineMap.getLineNumberFromPosition(end(_previousToken)) !== lineMap.getLineNumberFromPosition(start(token));
}
}