zuzu-rust 0.6.0

Rust implementation of ZuzuScript
Documentation 
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from std/cache/lru import Cache;
from test/more import *;

let calls := 0;
let cache := new Cache( capacity: 2 );

let v1 := cache.get( "alpha", function ( item_key ) {
	calls := calls + 1;
	return item_key _ "-value";
} );

is( v1, "alpha-value", "cache miss computes value" );
is( calls, 1, "producer called once on first miss" );
is( cache.size(), 1, "cache size after first insert" );

let v1_again := cache.get( "alpha", function ( item_key ) {
	calls := calls + 1;
	return item_key _ "-recomputed";
} );

is( v1_again, "alpha-value", "cache hit returns stored value" );
is( calls, 1, "producer not called on hit" );

cache.set( "beta", "beta-value" );
cache.get( "alpha", function ( item_key ) {
	calls := calls + 1;
	return item_key _ "-value";
} );
cache.set( "gamma", "gamma-value" );

is( cache.has("alpha"), 1, "recently used alpha remains" );
is( cache.has("beta"), 0, "least recently used beta evicted" );
is( cache.has("gamma"), 1, "new item inserted" );
is( cache.size(), 2, "size does not exceed capacity" );
is( cache.capacity(), 2, "capacity accessor" );

cache.empty();
is( cache.size(), 0, "empty clears all entries" );
is( cache.has("alpha"), 0, "empty removes alpha" );


done_testing();