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spec/util_array_spec.lua @ 13134:638f627e707f
util.datamanager: Add O(1) list indexing with on-disk index
Index file contains offsets and lengths of each item() which allows
seeking directly to each item and reading it without parsing the entire
file.
Also allows tricks like binary search, assuming items have some defined
order.
We take advantage of the 1-based indexing in tables to store a magic
header in the 0 position, so that table index 1 ends up at file index 1.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 11 May 2021 02:09:56 +0200 |
parent | 11787:3ae6fa901a8b |
child | 13245:ffe4adbd2af9 |
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local array = require "util.array"; describe("util.array", function () describe("creation", function () describe("from table", function () it("works", function () local a = array({"a", "b", "c"}); assert.same({"a", "b", "c"}, a); end); end); describe("from iterator", function () it("works", function () -- collects the first value, ie the keys local a = array(ipairs({true, true, true})); assert.same({1, 2, 3}, a); end); end); describe("collect", function () it("works", function () -- collects the first value, ie the keys local a = array.collect(ipairs({true, true, true})); assert.same({1, 2, 3}, a); end); end); end); describe("metatable", function () describe("operator", function () describe("addition", function () it("works", function () local a = array({ "a", "b" }); local b = array({ "c", "d" }); assert.same({"a", "b", "c", "d"}, a + b); end); end); describe("equality", function () it("works", function () local a1 = array({ "a", "b" }); local a2 = array({ "a", "b" }); local b = array({ "c", "d" }); assert.truthy(a1 == a2); assert.falsy(a1 == b); assert.falsy(a1 == { "a", "b" }, "Behavior of metatables changed in Lua 5.3"); end); end); describe("division", function () it("works", function () local a = array({ "a", "b", "c" }); local b = a / function (i) if i ~= "b" then return i .. "x" end end; assert.same({ "ax", "cx" }, b); end); end); end); end); describe("methods", function () describe("map", function () it("works", function () local a = array({ "a", "b", "c" }); local b = a:map(string.upper); assert.same({ "A", "B", "C" }, b); end); end); describe("filter", function () it("works", function () local a = array({ "a", "b", "c" }); a:filter(function (i) return i ~= "b" end); assert.same({ "a", "c" }, a); end); end); describe("sort", function () it("works", function () local a = array({ 5, 4, 3, 1, 2, }); a:sort(); assert.same({ 1, 2, 3, 4, 5, }, a); end); end); describe("unique", function () it("works", function () local a = array({ "a", "b", "c", "c", "a", "b" }); a:unique(); assert.same({ "a", "b", "c" }, a); end); end); describe("pluck", function () it("works", function () local a = array({ { a = 1, b = -1 }, { a = 2, b = -2 }, }); a:pluck("a"); assert.same({ 1, 2 }, a); end); end); describe("reverse", function () it("works", function () local a = array({ "a", "b", "c" }); a:reverse(); assert.same({ "c", "b", "a" }, a); end); end); -- TODO :shuffle describe("append", function () it("works", function () local a = array({ "a", "b", "c" }); a:append(array({ "d", "e", })); assert.same({ "a", "b", "c", "d", "e" }, a); end); end); describe("push", function () it("works", function () local a = array({ "a", "b", "c" }); a:push("d"):push("e"); assert.same({ "a", "b", "c", "d", "e" }, a); end); end); describe("pop", function () it("works", function () local a = array({ "a", "b", "c" }); assert.equal("c", a:pop()); assert.same({ "a", "b", }, a); end); end); describe("concat", function () it("works", function () local a = array({ "a", "b", "c" }); assert.equal("a,b,c", a:concat(",")); end); end); describe("length", function () it("works", function () local a = array({ "a", "b", "c" }); assert.equal(3, a:length()); end); end); describe("slice", function () it("works", function () local a = array({ "a", "b", "c" }); assert.equal(array.slice(a, 1, 2), array{ "a", "b" }); assert.equal(array.slice(a, 1, 3), array{ "a", "b", "c" }); assert.equal(array.slice(a, 2, 3), array{ "b", "c" }); assert.equal(array.slice(a, 2), array{ "b", "c" }); assert.equal(array.slice(a, -4), array{ "a", "b", "c" }); assert.equal(array.slice(a, -3), array{ "a", "b", "c" }); assert.equal(array.slice(a, -2), array{ "b", "c" }); assert.equal(array.slice(a, -1), array{ "c" }); end); it("can mutate", function () local a = array({ "a", "b", "c" }); assert.equal(a:slice(-1), array{"c"}); assert.equal(a, array{"c"}); end); end); end); -- TODO The various array.foo(array ina, array outa) functions end);