64 lines
2.5 KiB
Text
64 lines
2.5 KiB
Text
# memo_join.ludic - a key joined from its parent's key, a separator and a part ("App/3",
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# "App/3#7", "App/3/ui-thumb"), found by comparing in place, so an element's key is made once
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# the element first appears and never again
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function mm_hash_join(a: string, sep: string, b: string) -> int {
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var h = 216613626 ^ (MM_JOIN & 255)
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for i in 0 .. len(a) { h = ((h ^ a[i]) * 16777619) & 2147483647 }
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h = ((h ^ sep[0]) * 16777619) & 2147483647
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for i in 0 .. len(b) { h = ((h ^ b[i]) * 16777619) & 2147483647 }
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return h
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}
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function mm_is_join(k: string, a: string, sep: string, b: string) -> bool {
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let na = len(a)
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if len(k) != na + 1 + len(b) or k[na] != sep[0] { return false }
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return sat(k, 0, a) and sat(k, na + 1, b)
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}
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# a + sep + b, the same string every frame
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@alloc_ok("a memo miss: a joined key made once, bounded by MM_CAP")
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function mm_join(ui_st: mut UiState, a: string, sep: string, b: string) -> string {
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let m = mm_of(ui_st)
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var at = mm_hash_join(a, sep, b) & (MM_CAP - 1)
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while m.slots[at] != 0 {
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let i = m.slots[at] - 1
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if m.tags[i] == MM_JOIN and mm_is_join(m.keys[i], a, sep, b) { return m.keys[i] }
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at = (at + 1) & (MM_CAP - 1)
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}
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let k = a + sep + b
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if len(m.keys) * 4 >= MM_CAP * 3 { return k }
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push(m.keys, k)
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push(m.tags, MM_JOIN)
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push(m.lists, null)
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push(m.grads, null)
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push(m.texts, null)
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push(m.vals, null)
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push(m.vtpls, null)
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push(m.n1, 0.0)
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push(m.n2, 0.0)
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m.slots[at] = len(m.keys)
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return k
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}
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# a whole number's text, made once (a key's index, a count, money): 0..1023 at the start, the rest up
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# to MM_INT_MOST the first time each is shown; only past that is one made per call
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const MM_INT_MOST: int = 65536
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@alloc_ok("a memo miss: a number's text made the first time it is shown")
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function mm_int(ui_st: mut UiState, i: int) -> string {
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if i < 0 or i >= MM_INT_MOST { return string(i) }
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if ui_st.mm_ints == null {
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ui_st.mm_ints = new []string
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for k in 0 .. 1024 { push(ui_st.mm_ints, string(k)) }
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}
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let l = ui_st.mm_ints
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while len(l) <= i { push(l, "") }
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if i >= 1024 and len(l[i]) == 0 { l[i] = string(i) }
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return l[i]
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}
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# a small whole number as a Value, made once and shared: read it, never change it (a loop's index)
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@alloc_ok("once: the small numbers' Values")
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function mm_ival(ui_st: mut UiState, i: int) -> Val {
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if i < 0 or i >= 1024 { return Value.int(i) }
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if ui_st.mm_ivals == null {
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ui_st.mm_ivals = new []Val
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for k in 0 .. 1024 { push(ui_st.mm_ivals, Value.int(k)) }
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}
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return ui_st.mm_ivals[i]
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}
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