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89 lines (73 loc) · 3.07 KB
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import * as ts from "typescript";
import * as nativeAssert from "assert";
import * as path from "path";
export function castArray<T>(value: T | T[]): T[];
export function castArray<T>(value: T | readonly T[]): readonly T[];
export function castArray<T>(value: T | readonly T[]): readonly T[] {
return Array.isArray(value) ? value : [value];
}
export const intersperse = <T>(values: readonly T[], separator: T): T[] =>
values.flatMap((value, index) => (index === 0 ? [value] : [separator, value]));
export const union = <T>(...values: Array<Iterable<T>>): T[] => [...new Set(...values)];
export const intersection = <T>(first: readonly T[], ...rest: Array<readonly T[]>): T[] =>
union(first).filter(x => rest.every(r => r.includes(x)));
type DiagnosticFactory = (...args: any) => Partial<ts.Diagnostic> & Pick<ts.Diagnostic, "messageText">;
export const createDiagnosticFactoryWithCode = <T extends DiagnosticFactory>(code: number, create: T) =>
Object.assign(
(...args: Parameters<T>): ts.Diagnostic => ({
file: undefined,
start: undefined,
length: undefined,
category: ts.DiagnosticCategory.Error,
code,
source: "typescript-to-lua",
...create(...(args as any)),
}),
{ code }
);
let serialDiagnosticCodeCounter = 100000;
export const createSerialDiagnosticFactory = <T extends DiagnosticFactory>(create: T) =>
createDiagnosticFactoryWithCode(serialDiagnosticCodeCounter++, create);
export const normalizeSlashes = (filePath: string) => filePath.replace(/\\/g, "/");
export const trimExtension = (filePath: string) => filePath.slice(0, -path.extname(filePath).length);
export function formatPathToLuaPath(filePath: string): string {
filePath = filePath.replace(/\.json$/, "");
if (process.platform === "win32") {
// Windows can use backslashes
filePath = filePath.replace(/\.\\/g, "").replace(/\\/g, ".");
}
return filePath.replace(/\.\//g, "").replace(/\//g, ".");
}
type NoInfer<T> = [T][T extends any ? 0 : never];
export function getOrUpdate<K, V>(
// eslint-disable-next-line @typescript-eslint/ban-types
map: Map<K, V> | (K extends object ? WeakMap<K, V> : never),
key: K,
getDefaultValue: () => NoInfer<V>
): V {
if (!map.has(key)) {
map.set(key, getDefaultValue());
}
return map.get(key)!;
}
// eslint-disable-next-line @typescript-eslint/ban-types
export function isNonNull<T>(value: T | null | undefined): value is T {
return value != null;
}
export function cast<TOriginal, TCast extends TOriginal>(
item: TOriginal,
cast: (item: TOriginal) => item is TCast
): TCast {
if (cast(item)) {
return item;
} else {
throw new Error(`Failed to cast value to expected type using ${cast.name}.`);
}
}
export function assert(value: any, message?: string | Error): asserts value {
nativeAssert(value, message);
}
export function assertNever(_value: never): never {
throw new Error("Value is expected to be never");
}
export function assume<T>(_value: any): asserts _value is T {}