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[moved] table.copy from functional.lua to table.lua and updated signature a little to allow deep overlays

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This commit is contained in:
Max Cahill 2020-03-12 21:15:18 +11:00
parent 27b73543e0
commit 0dd92b2c2e
2 changed files with 33 additions and 20 deletions
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19
functional.lua
View File

@ -128,25 +128,6 @@ function table.append(t1, t2)
return r
end
--copy a table
-- if deep specified:
-- calls copy method of member directly if it exists
-- and recurses into all "normal" table children
function table.copy(t, deep)
local r = {}
for k,v in pairs(t) do
if deep and type(v) == "table" then
if type(v.copy) == "function" then
v = v:copy()
else
v = table.copy(v, deep)
end
end
r[k] = v
end
return r
end
-----------------------------------------------------------
--common queries and reductions
-----------------------------------------------------------

34
table.lua
View File

@ -101,13 +101,14 @@ if table.clear == nil then
--useful when multiple references are floating around
--so you cannot just pop a new table out of nowhere
function table.clear(t)
assert(type(to) == "table", "table.overlay - argument 'to' must be a table")
assert(type(to) == "table", "table.clear - argument 't' must be a table")
while t[1] ~= nil do
table.remove(t)
end
end
end
--overlay one table directly onto another, shallow only
function table.overlay(to, from)
assert(type(to) == "table", "table.overlay - argument 'to' must be a table")
assert(type(from) == "table", "table.overlay - argument 'from' must be a table")
@ -116,3 +117,34 @@ function table.overlay(to, from)
end
return to
end
--copy a table
-- deep_or_into is either:
-- a boolean value, used as deep flag directly
-- or a table to copy into, which implies a deep copy
-- if deep specified:
-- calls copy method of member directly if it exists
-- and recurses into all "normal" table children
-- if into specified, copies into that table
-- but doesn't clear anything out
-- (useful for deep overlays and avoiding garbage)
function table.copy(t, deep_or_into)
assert(type(t) == "table", "table.copy - argument 't' must be a table")
local is_bool = type(deep_or_into) == "boolean"
local is_table = type(deep_or_into) == "table"
local deep = (is_bool and deep_or_into) or is_table
local into = is_table and deep_or_into or {}
for k,v in pairs(t) do
if deep and type(v) == "table" then
if type(v.copy) == "function" then
v = v:copy()
else
v = table.copy(v, deep)
end
end
into[k] = v
end
return into
end