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Diffstat (limited to 'crawl-ref/source/dat/clua/util.lua')
| -rw-r--r-- | crawl-ref/source/dat/clua/util.lua | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/crawl-ref/source/dat/clua/util.lua b/crawl-ref/source/dat/clua/util.lua new file mode 100644 index 0000000000..0c327fd194 --- /dev/null +++ b/crawl-ref/source/dat/clua/util.lua @@ -0,0 +1,67 @@ +------------------------------------------------------------------------------ +-- util.lua +-- Lua utilities. +------------------------------------------------------------------------------ + +util = { } + +function util.catlist(...) + local res = { } + local tables = { ... } + if #tables == 1 then + return tables[1] + else + for _, tab in ipairs(tables) do + for _, val in ipairs(tab) do + table.insert(res, val) + end + end + end + return res +end + +function util.cathash(...) + local res = { } + local tables = { ... } + if #tables == 1 then + return tables[1] + else + for _, tab in ipairs(tables) do + for key, val in ipairs(tab) do + res[key] = val + end + end + end + return res +end + +function util.map(fn, ...) + local lists = { ... } + local res = { } + if #lists == 0 then + return res + elseif #lists == 1 then + for _, val in ipairs(lists[1]) do + table.insert(res, fn(val)) + end + else + for i = 1, #lists[1] do + local args = { } + for _, list in ipairs(lists) do + if not list[i] then + break + end + table.insert(args, list[i]) + end + if #args < #lists then + break + end + table.insert(res, fn(unpack(args))) + end + end + return res +end + +function util.random_from(list) + return list[ crawl.random2(#list) + 1 ] +end
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