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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { sep } from 'vs/base/common/path';
import { IdleValue } from 'vs/base/common/async';
// When comparing large numbers of strings, such as in sorting large arrays, is better for
// performance to create an Intl.Collator object and use the function provided by its compare
// property than it is to use String.prototype.localeCompare()
// A collator with numeric sorting enabled, and no sensitivity to case or to accents
const intlFileNameCollatorBaseNumeric: IdleValue<{ collator: Intl.Collator, collatorIsNumeric: boolean }> = new IdleValue(() => {
const collator = new Intl.Collator(undefined, { numeric: true, sensitivity: 'base' });
return {
collator: collator,
collatorIsNumeric: collator.resolvedOptions().numeric
};
});
// A collator with numeric sorting enabled.
const intlFileNameCollatorNumeric: IdleValue<{ collator: Intl.Collator }> = new IdleValue(() => {
const collator = new Intl.Collator(undefined, { numeric: true });
return {
collator: collator
};
});
// A collator with numeric sorting enabled, and sensitivity to accents and diacritics but not case.
const intlFileNameCollatorNumericCaseInsenstive: IdleValue<{ collator: Intl.Collator }> = new IdleValue(() => {
const collator = new Intl.Collator(undefined, { numeric: true, sensitivity: 'accent' });
return {
collator: collator
};
});/** Compares filenames without distinguishing the name from the extension. Disambiguates by unicode comparison. */
export function compareFileNames(one: string | null, other: string | null, caseSensitive = false): number {
const a = one || '';
const b = other || '';
const result = intlFileNameCollatorBaseNumeric.value.collator.compare(a, b);
// Using the numeric option in the collator will
// make compare(`foo1`, `foo01`) === 0. We must disambiguate.
if (intlFileNameCollatorBaseNumeric.value.collatorIsNumeric && result === 0 && a !== b) {
return a < b ? -1 : 1;
}
return result;
}
/** Compares filenames without distinguishing the name from the extension. Disambiguates by length, not unicode comparison. */
export function compareFileNamesDefault(one: string | null, other: string | null): number {
const collatorNumeric = intlFileNameCollatorNumeric.value.collator;
one = one || '';
other = other || '';
// Compare the entire filename - both name and extension - and disambiguate by length if needed
return compareAndDisambiguateByLength(collatorNumeric, one, other);
}
export function noIntlCompareFileNames(one: string | null, other: string | null, caseSensitive = false): number {
if (!caseSensitive) {
one = one && one.toLowerCase();
other = other && other.toLowerCase();
}
const [oneName, oneExtension] = extractNameAndExtension(one);
const [otherName, otherExtension] = extractNameAndExtension(other);
if (oneName !== otherName) {
return oneName < otherName ? -1 : 1;
}
if (oneExtension === otherExtension) {
return 0;
}
return oneExtension < otherExtension ? -1 : 1;
}
export function compareFileExtensions(one: string | null, other: string | null): number {
const [oneName, oneExtension] = extractNameAndExtension(one);
const [otherName, otherExtension] = extractNameAndExtension(other);
let result = intlFileNameCollatorBaseNumeric.value.collator.compare(oneExtension, otherExtension);
if (result === 0) {
// Using the numeric option in the collator will
// make compare(`foo1`, `foo01`) === 0. We must disambiguate.
if (intlFileNameCollatorBaseNumeric.value.collatorIsNumeric && oneExtension !== otherExtension) {
return oneExtension < otherExtension ? -1 : 1;
}
// Extensions are equal, compare filenames
result = intlFileNameCollatorBaseNumeric.value.collator.compare(oneName, otherName);
if (intlFileNameCollatorBaseNumeric.value.collatorIsNumeric && result === 0 && oneName !== otherName) {
return oneName < otherName ? -1 : 1;
}
}
return result;
}
/** Compares filenames by extenson, then by full filename */
export function compareFileExtensionsDefault(one: string | null, other: string | null): number {
one = one || '';
other = other || '';
const oneExtension = extractExtension(one);
const otherExtension = extractExtension(other);
const collatorNumeric = intlFileNameCollatorNumeric.value.collator;
const collatorNumericCaseInsensitive = intlFileNameCollatorNumericCaseInsenstive.value.collator;
let result;
// Check for extension differences, ignoring differences in case and comparing numbers numerically.
result = compareAndDisambiguateByLength(collatorNumericCaseInsensitive, oneExtension, otherExtension);
if (result !== 0) {
return result;
}
// Compare full filenames
return compareAndDisambiguateByLength(collatorNumeric, one, other);
}
const FileNameMatch = /^(.*?)(\.([^.]*))?$/;
/** Extracts the name and extension from a full filename, with optional special handling for dotfiles */
function extractNameAndExtension(str?: string | null, dotfilesAsNames = false): [string, string] {
const match = str ? FileNameMatch.exec(str) as Array<string> : ([] as Array<string>);
let result: [string, string] = [(match && match[1]) || '', (match && match[3]) || ''];
// if the dotfilesAsNames option is selected, treat an empty filename with an extension,
// or a filename that starts with a dot, as a dotfile name
if (dotfilesAsNames && (!result[0] && result[1] || result[0] && result[0].charAt(0) === '.')) {
result = [result[0] + '.' + result[1], ''];
}
return result;
}
/** Extracts the extension from a full filename. Treats dotfiles as names, not extensions. */
function extractExtension(str?: string | null): string {
const match = str ? FileNameMatch.exec(str) as Array<string> : ([] as Array<string>);
return (match && match[1] && match[1].charAt(0) !== '.' && match[3]) || '';
}
function compareAndDisambiguateByLength(collator: Intl.Collator, one: string, other: string) {
// Check for differences
let result = collator.compare(one, other);
if (result !== 0) {
return result;
}
// In a numeric comparison, `foo1` and `foo01` will compare as equivalent.
// Disambiguate by sorting the shorter string first.
if (one.length !== other.length) {
return one.length < other.length ? -1 : 1;
}
return 0;
}
function comparePathComponents(one: string, other: string, caseSensitive = false): number {
if (!caseSensitive) {
one = one && one.toLowerCase();
other = other && other.toLowerCase();
}
if (one === other) {
return 0;
}
return one < other ? -1 : 1;
}
export function comparePaths(one: string, other: string, caseSensitive = false): number {
const oneParts = one.split(sep);
const otherParts = other.split(sep);
const lastOne = oneParts.length - 1;
const lastOther = otherParts.length - 1;
let endOne: boolean, endOther: boolean;
for (let i = 0; ; i++) {
endOne = lastOne === i;
endOther = lastOther === i;
if (endOne && endOther) {
return compareFileNames(oneParts[i], otherParts[i], caseSensitive);
} else if (endOne) {
return -1;
} else if (endOther) {
return 1;
}
const result = comparePathComponents(oneParts[i], otherParts[i], caseSensitive);
if (result !== 0) {
return result;
}
}
}
export function compareAnything(one: string, other: string, lookFor: string): number {
const elementAName = one.toLowerCase();
const elementBName = other.toLowerCase();
// Sort prefix matches over non prefix matches
const prefixCompare = compareByPrefix(one, other, lookFor);
if (prefixCompare) {
return prefixCompare;
}
// Sort suffix matches over non suffix matches
const elementASuffixMatch = elementAName.endsWith(lookFor);
const elementBSuffixMatch = elementBName.endsWith(lookFor);
if (elementASuffixMatch !== elementBSuffixMatch) {
return elementASuffixMatch ? -1 : 1;
}
// Understand file names
const r = compareFileNames(elementAName, elementBName);
if (r !== 0) {
return r;
}
// Compare by name
return elementAName.localeCompare(elementBName);
}
export function compareByPrefix(one: string, other: string, lookFor: string): number {
const elementAName = one.toLowerCase();
const elementBName = other.toLowerCase();
// Sort prefix matches over non prefix matches
const elementAPrefixMatch = elementAName.startsWith(lookFor);
const elementBPrefixMatch = elementBName.startsWith(lookFor);
if (elementAPrefixMatch !== elementBPrefixMatch) {
return elementAPrefixMatch ? -1 : 1;
}
// Same prefix: Sort shorter matches to the top to have those on top that match more precisely
else if (elementAPrefixMatch && elementBPrefixMatch) {
if (elementAName.length < elementBName.length) {
return -1;
}
if (elementAName.length > elementBName.length) {
return 1;
}
}
return 0;
}