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Minor optimization for caseless matching in lpeg-utility

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dmiller
2022-09-08 18:14:52 +00:00
parent aabd8040eb
commit 3cfe60c3ed
1 changed files with 4 additions and 2 deletions
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6
nselib/lpeg-utility.lua
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@@ -13,17 +13,19 @@ local pairs = pairs
local string = require "string" local string = require "string"
local tonumber = tonumber local tonumber = tonumber
local rawset = rawset local rawset = rawset
local lower = string.lower
local upper = string.upper
_ENV = {} _ENV = {}
local caselessP = lpeg.Cf((lpeg.P(1) / function (a) return lpeg.S(lower(a)..upper(a)) end)^1, function (a, b) return a * b end)
--- ---
-- Returns a pattern which matches the literal string caselessly. -- Returns a pattern which matches the literal string caselessly.
-- --
-- @param literal A literal string to match case-insensitively. -- @param literal A literal string to match case-insensitively.
-- @return An LPeg pattern. -- @return An LPeg pattern.
function caseless (literal) function caseless (literal)
local caseless = lpeg.Cf((lpeg.P(1) / function (a) return lpeg.S(a:lower()..a:upper()) end)^1, function (a, b) return a * b end) return assert(caselessP:match(literal))
return assert(caseless:match(literal))
end end
--- ---