Minetest-WorldEditAdditions/worldeditadditions/utils/strings.lua
Starbeamrainbowlabs 9b9a471aa8
Implement initial (untested) convolution system.
Next we need to implement a worldedit function to handle fetching the 
manip data, calculating the heightmap, pushing it through this 
convolutional system, and saving the changes back again.
2020-06-09 01:21:32 +01:00

196 lines
5.9 KiB
Lua

-- Licence: GPLv2 (MPL-2.0 is compatible, so we can use this here)
-- Source: https://stackoverflow.com/a/43582076/1460422
-- gsplit: iterate over substrings in a string separated by a pattern
--
-- Parameters:
-- text (string) - the string to iterate over
-- pattern (string) - the separator pattern
-- plain (boolean) - if true (or truthy), pattern is interpreted as a plain
-- string, not a Lua pattern
--
-- Returns: iterator
--
-- Usage:
-- for substr in gsplit(text, pattern, plain) do
-- doSomething(substr)
-- end
function worldeditadditions.gsplit(text, pattern, plain)
local splitStart, length = 1, #text
return function ()
if splitStart then
local sepStart, sepEnd = string.find(text, pattern, splitStart, plain)
local ret
if not sepStart then
ret = string.sub(text, splitStart)
splitStart = nil
elseif sepEnd < sepStart then
-- Empty separator!
ret = string.sub(text, splitStart, sepStart)
if sepStart < length then
splitStart = sepStart + 1
else
splitStart = nil
end
else
ret = sepStart > splitStart and string.sub(text, splitStart, sepStart - 1) or ''
splitStart = sepEnd + 1
end
return ret
end
end
end
-- split: split a string into substrings separated by a pattern.
--
-- Parameters:
-- text (string) - the string to iterate over
-- pattern (string) - the separator pattern
-- plain (boolean) - if true (or truthy), pattern is interpreted as a plain
-- string, not a Lua pattern
--
-- Returns: table (a sequence table containing the substrings)
function worldeditadditions.split(text, pattern, plain)
local ret = {}
for match in worldeditadditions.gsplit(text, pattern, plain) do
table.insert(ret, match)
end
return ret
end
--- Pads str to length len with char from right
-- @source https://snipplr.com/view/13092/strlpad--pad-string-to-the-left
function worldeditadditions.str_padend(str, len, char)
if char == nil then char = ' ' end
return str .. string.rep(char, len - #str)
end
--- Pads str to length len with char from left
-- Adapted from the above
function worldeditadditions.str_padstart(str, len, char)
if char == nil then char = ' ' end
return string.rep(char, len - #str) .. str
end
--- Equivalent to string.startsWith in JS
-- @param str string The string to operate on
-- @param start number The start string to look for
-- @returns bool Whether start is present at the beginning of str
function worldeditadditions.string_starts(str,start)
return string.sub(str,1,string.len(start))==start
end
--- Prints a 2d array of numbers formatted like a JS TypedArray (e.g. like a manip node list or a convolutional kernel)
-- In other words, the numbers should be formatted as a single flat array.
-- @param tbl number[] The ZERO-indexed list of numbers
-- @param width number The width of 2D array.
function worldeditadditions.print_2d(tbl, width)
local next = {}
for i=0, #tbl do
table.insert(next, tbl[i])
if #next == width then
print(table.concat(next, "\t"))
next = {}
end
end
end
--- Turns an associative node_id → count table into a human-readable list.
-- Works well with worldeditadditions.make_ascii_table().
function worldeditadditions.node_distribution_to_list(distribution, nodes_total)
local distribution_data = {}
for node_id, count in pairs(distribution) do
table.insert(distribution_data, {
count,
tostring(worldeditadditions.round((count / nodes_total) * 100, 2)).."%",
minetest.get_name_from_content_id(node_id)
})
end
return distribution_data
end
--- Makes a human-readable table of data.
-- Data should be a 2D array - i.e. a table of tables. The nested tables should
-- contain a list of items for a single row.
-- If total is specified, then a grand total is printed at the bottom - this is
-- useful when you want to print a node list - works well with
-- worldeditadditions.node_distribution_to_list().
function worldeditadditions.make_ascii_table(data, total)
local extra_padding = 2
local result = {}
local max_lengths = {}
for y = 1, #data, 1 do
for x = 1, #data[y], 1 do
if not max_lengths[x] then
max_lengths[x] = 0
end
max_lengths[x] = math.max(max_lengths[x], #tostring(data[y][x]) + extra_padding)
end
end
for _key, row in ipairs(data) do
local row_result = {}
for i = 1, #row, 1 do
row_result[#row_result + 1] = worldeditadditions.str_padend(tostring(row[i]), max_lengths[i], " ")
end
result[#result+1] = table.concat(row_result, "")
end
if total then
result[#result+1] = string.rep("=", 6 + #tostring(total) + 6).."\n"..
"Total "..total.." nodes\n"
end
-- TODO: Add multi-column support here
return table.concat(result, "\n")
end
--- Parses a list of strings as a list of weighted nodes - e.g. like in the //mix command.
-- @param parts string[] The list of strings to parse (try worldeditadditions.split)
-- @returns table A table in the form node_name => weight.
function worldeditadditions.parse_weighted_nodes(parts)
local MODE_EITHER = 1
local MODE_NODE = 2
local result = {}
local mode = MODE_NODE
local last_node_name = nil
for i, part in ipairs(parts) do
print("i: "..i..", part: "..part)
if mode == MODE_NODE then
print("mode: node");
local next = worldedit.normalize_nodename(part)
if not next then
return false, "Error: Invalid node name '"..part.."'"
end
last_node_name = next
mode = MODE_EITHER
elseif mode == MODE_EITHER then
print("mode: either");
local chance = tonumber(part)
if not chance then
local node_name = worldedit.normalize_nodename(part)
if not node_name then
return false, "Error: Invalid number '"..chance.."'"
end
if last_node_name then
result[last_node_name] = 1
end
last_node_name = node_name
mode = MODE_EITHER
else
result[last_node_name] = math.floor(chance)
mode = MODE_NODE
end
end
end
if last_node_name then
result[last_node_name] = 1
end
return true, result
end