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TEST: implement split_shell

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Starbeamrainbowlabs 2021-07-28 17:39:09 +01:00
parent a3bba21266
commit 31a4d89a49
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1 changed files with 72 additions and 0 deletions
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worldeditadditions/utils/strings/split_shell.lua Normal file
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function is_whitespace(char)
return char == " " or char == "\t" or char == "\r" or char == "\n"
end
function split_shell(text)
local text_length = #text
local scan_pos = 1
local result = { }
local acc = {}
local mode = "NORMAL" -- NORMAL, INSIDE_QUOTES_SINGLE, INSIDE_QUOTES_DOUBLE
for i=1,text_length do
local prevchar = ""
local curchar = text:sub(i,i)
local nextchar = ""
local nextnextchar = ""
if i > 1 then prevchar = text:sub(i-1, i-1) end
if i < text_length then nextchar = text:sub(i+1, i+1) end
if i+1 < text_length then nextnextchar = text:sub(i+2, i+2) end
if mode == "NORMAL" then
if is_whitespace(curchar) and #acc > 0 then
table.insert(result, table.concat(acc, ""))
acc = {}
elseif (curchar == "\"" or curchar == "'") and #acc == 0 and prevchar ~= "\\" then
if curchar == "\"" then
mode = "INSIDE_QUOTES_DOUBLE"
else
mode = "INSIDE_QUOTES_SINGLE"
end
else
table.insert(acc, curchar)
end
elseif mode == "INSIDE_QUOTES_DOUBLE" then
if curchar == "\"" and prevchar ~= "\\" and is_whitespace(nextchar) then
-- It's the end of a quote!
mode = "NORMAL"
elseif (curchar == "\\" and nextchar ~= "\"" and not is_whitespace(nextnextchar)) or curchar ~= "\\" then
-- It's a regular character
table.insert(acc, curchar)
end
elseif mode == "INSIDE_QUOTES_SINGLE" then
if curchar == "'" and prevchar ~= "\\" and is_whitespace(nextchar) then
-- It's the end of a quote!
mode = "NORMAL"
elseif (curchar == "\\" and nextchar ~= "'" and not is_whitespace(nextnextchar)) or curchar ~= "\\" then
-- It's a regular character
table.insert(acc, curchar)
end
end
end
if #acc > 0 then
table.insert(result, table.concat(acc, ""))
end
return result
end
function test(text)
print("Source", text)
for i,value in ipairs(split_shell(text)) do
print("i", i, "→", value)
end
print("************")
end
test("yay yay yay")
test("yay \"yay yay\" yay")
test("yay \"yay\\\" yay\" yay")
test("yay \"yay 'inside quotes' yay\" yay")
test("yay 'inside quotes' another")