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renovatebot_renovate/lib/util/string.ts
2025-02-25 06:17:14 +00:00

170 lines
4.1 KiB
TypeScript

// Return true if the match string is found at index in content
export function matchAt(
content: string,
index: number,
match: string,
): boolean {
return content.substring(index, index + match.length) === match;
}
// Replace oldString with newString at location index of content
export function replaceAt(
content: string,
index: number,
oldString: string,
newString: string,
): string {
return (
content.substring(0, index) +
newString +
content.substring(index + oldString.length)
);
}
/**
* Converts from utf-8 string to base64-encoded string
*/
export function toBase64(input: string): string {
return Buffer.from(input).toString('base64');
}
/**
* Converts from base64-encoded string to utf-8 string
*/
export function fromBase64(input: string): string {
return Buffer.from(input, 'base64').toString();
}
export function uniqueStrings(
element: string,
index: number,
elements: string[],
): boolean {
return elements.indexOf(element) === index;
}
export function looseEquals(
a: string | null | undefined,
b: string | null | undefined,
): boolean {
if (!(a && b)) {
return a === b;
}
return a.localeCompare(b, undefined, { sensitivity: 'base' }) === 0;
}
export function titleCase(input: string): string {
const words = input.toLowerCase().split(' ');
for (let i = 0; i < words.length; i++) {
const word = words[i];
words[i] = word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
}
return words.join(' ');
}
/**
* Sometimes we extract small strings from a multi-megabyte files.
* If we then save them in the in-memory cache, V8 may not free
* the initial buffer, which can lead to memory leaks:
*
* https://bugs.chromium.org/p/v8/issues/detail?id=2869
*
*/
export function copystr(x: string): string {
const len = Buffer.byteLength(x, 'utf8');
const buf = Buffer.allocUnsafeSlow(len);
buf.write(x, 'utf8');
return buf.toString('utf8');
}
/**
* Coerce a value to a string with optional default value.
* @param val value to coerce
* @returns the coerced value.
*/
export function coerceString(
val: string | null | undefined,
def?: string,
): string {
return val ?? def ?? '';
}
/**
* Remove templates from string.
*
* This is more performant version of this code:
*
* ```
* content
* .replaceAll(regEx(/{{`.+?`}}/gs), '')
* .replaceAll(regEx(/{{.+?}}/gs), '')
* .replaceAll(regEx(/{%`.+?`%}/gs), '')
* .replaceAll(regEx(/{%.+?%}/gs), '')
* .replaceAll(regEx(/{#.+?#}/gs), '')
* ```
*/
export function stripTemplates(content: string): string {
const result: string[] = [];
const len = content.length;
let idx = 0;
let lastPos = 0; // Tracks the start index of the next chunk to push
while (idx < len) {
if (content[idx] === '{' && idx + 1 < len) {
let closing: string | undefined;
let skipLength = 0;
if (content[idx + 1] === '%') {
if (idx + 2 < len && content[idx + 2] === '`') {
// Handle `{%` ... `%}`
closing = '`%}';
skipLength = 3;
} else {
// Handle `{% ... %}`
closing = '%}';
skipLength = 2;
}
} else if (content[idx + 1] === '{') {
if (idx + 2 < len && content[idx + 2] === '`') {
// Handle `{{` ... `}}`
closing = '`}}';
skipLength = 3;
} else {
// Handle `{{ ... }}`
closing = '}}';
skipLength = 2;
}
} else if (content[idx + 1] === '#') {
// Handle `{# ... #}`
closing = '#}';
skipLength = 2;
}
if (closing) {
const end = content.indexOf(closing, idx + skipLength);
if (end !== -1) {
// Append the content before the pattern
if (idx > lastPos) {
result.push(content.slice(lastPos, idx));
}
// Move `idx` past the closing tag
idx = end + closing.length;
lastPos = idx; // Update the last position
continue;
}
}
}
idx++;
}
// Append any remaining content after the last pattern
if (lastPos < len) {
result.push(content.slice(lastPos));
}
return result.join('');
}