# tpl_lines.ludic - which line of its file an element is on
# the text being read, and where its lines start, so an element can say which line it is on
function tp_lines(ui_st: mut UiState, src: string) -> void {
  ui_st.tp_nl = new []int
  for i in 0 .. len(src) {
    if src[i] == 10 { push(ui_st.tp_nl, i) }
  }
}
function tp_line(ui_st: UiState, at: int) -> int {
  var lo = 0
  var hi = len(ui_st.tp_nl)
  while lo < hi {
    let mid = (lo + hi) / 2
    if ui_st.tp_nl[mid] < at { lo = mid + 1 } else { hi = mid }
  }
  return lo + 1
}

# text beside elements (<button><img/>Resume</button>): each run of it a text of its own, in order
function tp_mixed(x: Xml) -> bool {
  if Xml.child_count(x) == 0 or x.tag == "style" { return false }
  for i in 0 .. len(x.mixed) {
    if x.mixed[i].tag == "#text" { return true }
  }
  return false
}
function tp_read_mixed(ui_st: mut UiState, t: UiTpl, x: Xml, file: string, err: []string) -> void {
  for i in 0 .. len(x.mixed) {
    let m = x.mixed[i]
    if m.tag == "#text" {
      let r = new UiTpl
      r.tag = "#text"
      r.where = t.where
      r.keys = new []string
      r.vals = new []UiExpr
      r.on_keys = new []string
      r.on_acts = new []UiAct
      r.kids = new []UiTpl
      r.text = ex_text(tpl_words(m.text), err)
      push(t.kids, r)
    } else { push(t.kids, tpl_read(ui_st, m, file)) }
  }
}