ea221f3283
This PR modifies the signature of the functions `Nat.fold`, `Nat.foldRev`, `Nat.any`, `Nat.all`, so that the function is passed the upper bound. This allows us to change runtime array bounds checks to compile time checks in many places.
49 lines
1.8 KiB
Text
49 lines
1.8 KiB
Text
import Lean.Data.PersistentHashMap
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import Lean.Data.Format
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open Lean Std Lean.PersistentHashMap
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abbrev Map := PersistentHashMap Nat Nat
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partial def formatMap : Node Nat Nat → Format
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| Node.collision keys vals _ => Format.sbracket $
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keys.size.fold
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(fun i _ fmt =>
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let k := keys[i];
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let v := vals.get! i;
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let p := if i > 0 then fmt ++ format "," ++ Format.line else fmt;
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p ++ "c@" ++ Format.paren (format k ++ " => " ++ format v))
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Format.nil
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| Node.entries entries => Format.sbracket $
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entries.size.fold
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(fun i _ fmt =>
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let entry := entries[i];
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let p := if i > 0 then fmt ++ format "," ++ Format.line else fmt;
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p ++
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match entry with
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| Entry.null => "<null>"
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| Entry.ref node => formatMap node
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| Entry.entry k v => Format.paren (format k ++ " => " ++ format v))
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Format.nil
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def checkState (m : Map) : IO Unit := do
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unless (m.stats.maxDepth == 1) do (IO.println "unexpected max depth");
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unless (m.stats.numCollisions == 0) do (IO.println "unexpected number of collisions")
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def main : IO Unit := do
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let m : Map := PersistentHashMap.empty;
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let m := m.insert 1 1;
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let m := m.insert (32^5 + 1) 2;
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let max := PersistentHashMap.maxDepth.toNat;
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let m := m.insert (32^max + 1) 3;
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let m := m.insert (32^(max+1) + 1) 4;
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let m := m.insert (32^(max+2) + 1) 5;
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unless (m.stats.maxDepth == PersistentHashMap.maxDepth.toNat) do (IO.println "unexpected max depth");
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unless (m.stats.numCollisions == 3) do (IO.println "unexpected number of collisions");
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IO.println m.stats;
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let m := m.erase (32^(max+1) + 1);
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let m := m.erase (32^(max+2) + 1);
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let m := m.erase (32^max + 1);
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unless (m.stats.maxDepth == PersistentHashMap.maxDepth.toNat - 1) do (IO.println "unexpected max depth");
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let m := m.erase (32^5 + 1);
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checkState m;
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IO.println m.stats
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