80 lines
2.3 KiB
Text
80 lines
2.3 KiB
Text
# select.ludic - CSS selectors: a compound (`button.primary#buy[type=big]:hover:not(.off)`) joined
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# to the one on its left by a space (anywhere inside it) or `>` (straight inside it)
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export property UiSel {
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tag: string = ""
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id: string = ""
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classes: []string = null
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akeys: []string = null
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avals: []string = null # "" with aops 0 is [attr]; aops 1 is [attr=value]
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aops: []int = null
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pseudos: []string = null
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pargs: []string = null
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nots: []UiSel = null
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prev: UiSel = null
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comb: int = 0 # prev is: 0 an ancestor, 1 the parent, 2 the sibling before, 3 any sibling before
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}
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function sel_new() -> UiSel {
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let s = new UiSel
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s.classes = new []string
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s.akeys = new []string
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s.avals = new []string
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s.aops = new []int
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s.pseudos = new []string
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s.pargs = new []string
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s.nots = new []UiSel
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return s
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}
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function sel_parse(src: string, err: []string) -> UiSel {
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let r = new UiRd
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r.s = src
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var cur: UiSel = null
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var comb = 0
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while r.err == "" {
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rd_ws(r)
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if r.i >= len(r.s) { break }
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if rd_op(r, ">") {
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comb = 1
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continue
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}
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if rd_op(r, "+") {
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comb = 2
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continue
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}
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if rd_op(r, "~") {
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comb = 3
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continue
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}
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let c = sel_compound(r)
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c.prev = cur
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c.comb = comb
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cur = c
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comb = 0
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}
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if r.err != "" { push(err, r.err) }
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unsafe { free(r) } # the reader only: every name read from it is a copy
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@alloc_ok("only when a template is wrong: a broken screen, never a working one")
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if cur == null { push(err, `"{src}" selects nothing`) }
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return cur
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}
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function sel_is_name(c: int) -> bool { return rd_is_word(c) or c == 45 }
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function sel_name(r: UiRd) -> string {
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let at = r.i
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while r.i < len(r.s) and sel_is_name(r.s[r.i]) { r.i += 1 }
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if r.i == at { rd_fail(r, "a name") }
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return r.s[at..r.i]
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}
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function sel_compound(r: UiRd) -> UiSel {
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let s = sel_new()
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if rd_c(r, 0) == 42 { r.i += 1 } else if sel_is_name(rd_c(r, 0)) { s.tag = sel_name(r) }
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while r.err == "" and r.i < len(r.s) {
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let c = rd_c(r, 0)
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if c == 35 {
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r.i += 1
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s.id = sel_name(r)
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} else if c == 46 {
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r.i += 1
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push(s.classes, sel_name(r))
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} else if c == 91 { sel_attr(r, s) } else if c == 58 { sel_pseudo(r, s) } else if c == 42 { r.i += 1 } else { return s }
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}
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return s
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}
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