Function advance

src/utils/bash/bashParser.ts:146–160

Advance one JS char, updating byte offset for UTF-8.

(L: Lexer)

/** Advance one JS char, updating byte offset for UTF-8. */
function advance(L: Lexer): void {
  const c = L.src.charCodeAt(L.i)
  L.i++
  if (c < 0x80) {
    L.b++
  } else if (c < 0x800) {
    L.b += 2
  } else if (c >= 0xd800 && c <= 0xdbff) {
    // High surrogate — next char completes the pair, total 4 UTF-8 bytes
    L.b += 4
    L.i++
  } else {
    L.b += 3
  }
}

function peek(L: Lexer, off = 0): string {
  return L.i + off < L.len ? L.src[L.i + off]! : ''