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AliasAlreadyTaken 2024-09-09 02:17:15 +02:00
commit 09e8eec932
5 changed files with 269 additions and 0 deletions

73
alg1.lua Normal file
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local function stringToTable(str)
local function parseValue(s, i)
s = s:match("^%s*(.-)%s*$", i) -- Trim leading/trailing spaces
i = 1
if s:sub(1, 1) == "{" then
return parseTable(s)
elseif s:sub(1, 4) == "true" then
return true, 5
elseif s:sub(1, 5) == "false" then
return false, 6
elseif s:sub(1, 3) == "nil" then
return nil, 4
elseif s:match("^%d+%.?%d*") then
local num = tonumber(s:match("^%d+%.?%d*"))
return num, #tostring(num) + 1
elseif s:sub(1, 1) == '"' or s:sub(1, 1) == "'" then
local quote = s:sub(1, 1)
local value = ""
for i = 2, #s do
if s:sub(i, i) == quote and s:sub(i-1, i-1) ~= "\\" then
return value, i + 1
end
value = value .. s:sub(i, i)
end
error("Unclosed string")
else
error("Invalid value")
end
end
local function parseTable(s)
local tbl = {}
local i = 2 -- Start after the opening '{'
local key = nil
while i <= #s do
if s:sub(i, i) == "}" then
return tbl, i + 1
elseif s:sub(i, i) == "," then
i = i + 1
elseif s:sub(i, i) == "[" then
local value, next_i = parseValue(s:sub(i + 1))
i = i + next_i
if s:sub(i, i) ~= "]" then
error("Expected closing bracket")
end
key = value
i = i + 1
elseif key == nil then
local value, next_i = parseValue(s:sub(i))
key = value
i = i + next_i - 1
elseif s:sub(i, i) == "=" then
i = i + 1
local value, next_i = parseValue(s:sub(i))
tbl[key] = value
key = nil
i = i + next_i - 1
else
error("Unexpected character: " .. s:sub(i, i))
end
end
error("Unclosed table")
end
local result, _ = parseValue(str)
return result
end
function test_string_to_table.s2t1(str)
return stringToTable(str)
end

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alg2.lua Normal file
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local function stringToTable(str)
local function parseValue(s)
s = s:match("^%s*(.-)%s*$") -- trim whitespace
if s == "nil" then
return nil
elseif s == "true" then
return true
elseif s == "false" then
return false
elseif tonumber(s) then
return tonumber(s)
elseif s:match("^\".*\"$") or s:match("^'.*'$") then
return s:sub(2, -2):gsub("\\(.)", "%1") -- handle escape sequences
elseif s:match("^%b{}$") then
return stringToTable(s)
else
error("Unrecognized value: " .. s)
end
end
local tbl = {}
local key, value
local inKey = true
local depth = 0
local buffer = ""
for i = 1, #str do
local char = str:sub(i, i)
if char == '{' then
if depth > 0 then
buffer = buffer .. char
end
depth = depth + 1
elseif char == '}' then
depth = depth - 1
if depth > 0 then
buffer = buffer .. char
elseif depth == 0 and buffer ~= "" then
value = buffer
buffer = ""
end
elseif char == ',' and depth == 1 then
if inKey then
key = parseValue(buffer)
else
value = parseValue(buffer)
tbl[key] = value
end
buffer = ""
inKey = not inKey
elseif char == '=' and depth == 1 then
key = parseValue(buffer)
buffer = ""
inKey = false
else
buffer = buffer .. char
end
if depth == 1 and i == #str and buffer ~= "" then
value = parseValue(buffer)
tbl[key] = value
end
end
return tbl
end
function test_string_to_table.s2t2(str)
return stringToTable(str)
end

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alg3.lua Normal file
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local function stringToTable(str)
local function errorAtPos(msg, pos)
error(msg .. " at position " .. pos)
end
local function parseValue(s, i)
s = s:match("^%s*(.-)%s*$", i) -- Trim leading/trailing spaces
i = 1
if s:sub(i, i) == "{" then
return parseTable(s, i)
elseif s:sub(i, i+3) == "true" then
return true, i + 4
elseif s:sub(i, i+4) == "false" then
return false, i + 5
elseif s:sub(i, i+2) == "nil" then
return nil, i + 3
elseif s:match("^%-?%d+%.?%d*[eE]%-?%d+") or s:match("^%-?%d+%.?%d*") then
local num = tonumber(s:match("^%-?%d+%.?%d*[eE]%-?%d*"))
return num, i + #tostring(num)
elseif s:sub(i, i) == '"' or s:sub(i, i) == "'" then
local quote = s:sub(i, i)
local value = ""
i = i + 1
while i <= #s do
if s:sub(i, i) == quote and s:sub(i-1, i-1) ~= "\\" then
return value, i + 1
end
value = value .. s:sub(i, i)
i = i + 1
end
errorAtPos("Unclosed string", i)
else
errorAtPos("Invalid value", i)
end
end
local function parseTable(s, i)
local tbl = {}
local key = nil
i = i + 1 -- Start after the opening '{'
while i <= #s do
i = i + (s:match("^%s*", i) or 0) -- Skip any whitespace
if s:sub(i, i) == "}" then
return tbl, i + 1
elseif s:sub(i, i) == "," then
i = i + 1
elseif s:sub(i, i) == "[" then
key, i = parseValue(s, i + 1)
i = i + (s:match("^%s*", i) or 0)
if s:sub(i, i) ~= "]" then
errorAtPos("Expected closing bracket", i)
end
i = i + 1
elseif key == nil then
key, i = parseValue(s, i)
elseif s:sub(i, i) == "=" then
i = i + 1
local value
value, i = parseValue(s, i)
tbl[key] = value
key = nil
else
errorAtPos("Unexpected character", i)
end
end
errorAtPos("Unclosed table", i)
end
local function preprocess(str)
return str:gsub("%s+", " ") -- Replace multiple spaces with a single space
end
str = preprocess(str)
local result, _ = parseValue(str, 1)
return result
end
function test_string_to_table.s2t3(str)
return stringToTable(str)
end

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init.lua Normal file
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test_string_to_table ={}
test_string_to_table.modpath = minetest.get_modpath("test_string_to_table") .. DIR_DELIM
dofile(test_string_to_table.modpath .. "alg1.lua")
dofile(test_string_to_table.modpath .. "alg2.lua")
dofile(test_string_to_table.modpath .. "alg3.lua")
local tests = {
'{1, 2, 3}',
'{a = 1, b = 2, c = 3}',
'{a = {b = {c = 3}}}',
'{1, "hello", true, false, nil, 3.14}',
'{[1] = "one", [2] = "two", ["three"] = 3}',
'{"quoted string", \'single quoted\'}',
'{nested = {tables = {are = {supported = true}}}}',
"{key1 = 123, key2 = true, key3 = {nestedKey1 = 'value1', nestedKey2 = false}}"
}
local function test(alg)
-- alg1
local outcome = {}
local t1 = minetest.get_us_time()
for _, case in ipairs(tests) do
local ret = {case, test_string_to_table[alg](case)}
table.insert(outcome, ret)
end
local t2 = minetest.get_us_time()
minetest.log("action",alg .. " = " .. (t2-t1))
end
-- test("s2t1")
-- test("s2t2")
test("s2t3")

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mod.conf Normal file
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name = test_string_to_table