Class Stream

src/pseudo_json.mjs:1–27

class Stream {
  constructor(str) {
    this.str = str
    this.pos = 0
  }

  err(msg) {
    throw new SyntaxError(msg + " at " + this.pos + " in " + JSON.stringify(this.str))
  }

  space() {
    for (;;) {
      let next = this.next
      if (next == 32 || next == 9 || next == 10 || next == 13) this.pos++
      else break
    }
  }

  get next() {
    return this.str.charCodeAt(this.pos)
  }

  ahead(n) {
    this.pos += n
    this.space()
  }
}

export function parse(str) {
  let stream = new Stream(str)