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Copy pathtextUtilities.ts
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94 lines (80 loc) · 3.04 KB
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///<reference path='references.ts' />
module TypeScript.TextUtilities {
export interface ICharacterSequence {
charCodeAt(index: number): number;
length: number;
}
export function parseLineStarts(text: ICharacterSequence): number[]{
var length = text.length;
// Corner case check
if (0 === length) {
var result = new Array<number>();
result.push(0);
return result;
}
var position = 0;
var index = 0;
var arrayBuilder = new Array<number>();
var lineNumber = 0;
// The following loop goes through every character in the text. It is highly
// performance critical, and thus inlines knowledge about common line breaks
// and non-line breaks.
while (index < length) {
var c = text.charCodeAt(index);
var lineBreakLength: number;
// common case - ASCII & not a line break
if (c > CharacterCodes.carriageReturn && c <= 127) {
index++;
continue;
}
else if (c === CharacterCodes.carriageReturn && index + 1 < length && text.charCodeAt(index + 1) === CharacterCodes.lineFeed) {
lineBreakLength = 2;
}
else if (c === CharacterCodes.lineFeed) {
lineBreakLength = 1;
}
else {
lineBreakLength = TextUtilities.getLengthOfLineBreak(text, index);
}
if (0 === lineBreakLength) {
index++;
}
else {
arrayBuilder.push(position);
index += lineBreakLength;
position = index;
lineNumber++;
}
}
// Create a start for the final line.
arrayBuilder.push(position);
return arrayBuilder;
}
export function getLengthOfLineBreakSlow(text: ICharacterSequence, index: number, c: number): number {
if (c === CharacterCodes.carriageReturn) {
var next = index + 1;
return (next < text.length) && CharacterCodes.lineFeed === text.charCodeAt(next) ? 2 : 1;
}
else if (isAnyLineBreakCharacter(c)) {
return 1;
}
else {
return 0;
}
}
export function getLengthOfLineBreak(text: ICharacterSequence, index: number): number {
var c = text.charCodeAt(index);
// common case - ASCII & not a line break
if (c > CharacterCodes.carriageReturn && c <= 127) {
return 0;
}
return getLengthOfLineBreakSlow(text, index, c);
}
export function isAnyLineBreakCharacter(c: number): boolean {
return c === CharacterCodes.lineFeed ||
c === CharacterCodes.carriageReturn ||
c === CharacterCodes.nextLine ||
c === CharacterCodes.lineSeparator ||
c === CharacterCodes.paragraphSeparator;
}
}