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Improve `regex.gsub` performance (#1220)

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Guldoman 2022-12-03 01:21:05 +01:00 committed by GitHub
parent 5db5512663
commit f7ad8753eb
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1 changed files with 7 additions and 7 deletions
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14
data/core/regex.lua
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@ -39,10 +39,11 @@ end
regex.gsub = function(pattern_string, str, replacement) regex.gsub = function(pattern_string, str, replacement)
local pattern = type(pattern_string) == "table" and local pattern = type(pattern_string) == "table" and
pattern_string or regex.compile(pattern_string) pattern_string or regex.compile(pattern_string)
local result, indices = "" local result, indices = {}
local matches, replacements = {}, {} local matches, replacements = {}, {}
local offset = 0
repeat repeat
indices = { regex.cmatch(pattern, str) } indices = { regex.cmatch(pattern, str, offset) }
if #indices > 0 then if #indices > 0 then
table.insert(matches, indices) table.insert(matches, indices)
local currentReplacement = replacement local currentReplacement = replacement
@ -58,14 +59,13 @@ regex.gsub = function(pattern_string, str, replacement)
currentReplacement = string.gsub(currentReplacement, "\\%d", "") currentReplacement = string.gsub(currentReplacement, "\\%d", "")
table.insert(replacements, { indices[1], #currentReplacement+indices[1] }) table.insert(replacements, { indices[1], #currentReplacement+indices[1] })
if indices[1] > 1 then if indices[1] > 1 then
result = result .. table.insert(result, str:sub(offset, previous_character(str, indices[1])) .. currentReplacement)
str:sub(1, previous_character(str, indices[1])) .. currentReplacement
else else
result = result .. currentReplacement table.insert(result, currentReplacement)
end end
str = str:sub(indices[2]) offset = indices[2]
end end
until #indices == 0 or indices[1] == indices[2] until #indices == 0 or indices[1] == indices[2]
return result .. str, matches, replacements return table.concat(result) .. str:sub(offset), matches, replacements
end end