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import fs from "fs";
import path from "path";
import { isAscii } from "buffer";
// MSVC has a max of 16k characters per string literal
// Combining string literals didn't support constexpr apparently
// so we have to do this the gigantic array way
export function fmtCPPString(str: string, nullTerminated: boolean = true) {
const normalized = str + "\n";
var remain = normalized;
const chars =
"{" +
remain
.split("")
.map(a => a.charCodeAt(0))
.join(",") +
(nullTerminated ? ",0" : "") +
"}";
return [chars, normalized.length + (nullTerminated ? 1 : 0)];
}
export function declareASCIILiteral(name: string, value: string) {
const [chars, count] = fmtCPPString(value);
return `static constexpr const char ${name}Bytes[${count}] = ${chars};
static constexpr ASCIILiteral ${name} = ASCIILiteral::fromLiteralUnsafe(${name}Bytes);`;
}
export function cap(str: string) {
return str[0].toUpperCase() + str.slice(1);
}
export function low(str: string) {
if (str.startsWith("JS")) {
return "js" + str.slice(2);
}
return str[0].toLowerCase() + str.slice(1);
}
export function readdirRecursive(root: string): string[] {
const files = fs.readdirSync(root, { withFileTypes: true });
return files.flatMap(file => {
const fullPath = path.join(root, file.name);
return file.isDirectory() ? readdirRecursive(fullPath) : fullPath;
});
}
export function resolveSyncOrNull(specifier: string, from: string) {
try {
return Bun.resolveSync(specifier, from);
} catch {
return null;
}
}
export function checkAscii(str: string) {
if (!isAscii(Buffer.from(str))) {
throw new Error(`non-ascii character in string "${str}". this will not be a valid ASCIILiteral`);
}
return str;
}
export function writeIfNotChanged(file: string, contents: string) {
if (Array.isArray(contents)) contents = contents.join("");
if (fs.existsSync(file)) {
const oldContents = fs.readFileSync(file, "utf8");
if (oldContents === contents) {
return;
}
}
try {
fs.writeFileSync(file, contents);
} catch (error) {
fs.mkdirSync(path.dirname(file), { recursive: true });
fs.writeFileSync(file, contents);
}
}
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