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questhelperredux/QuestHelper/pattern.lua

83 lignes
2,2 Kio
Lua

QuestHelper_File["pattern.lua"] = "4.0.1.$svnversion$"
QuestHelper_Loadtime["pattern.lua"] = GetTime()
-- The following junk is for building functions to parse strings for various locales.
local varindex, varswap = 0, {}
local function replacePattern(p)
varindex = varindex + 1
local b, e, i = string.find(p, "(%d-)%$")
if i then
-- String contains an index.
p = string.sub(p, 1, b-1)..string.sub(p, e+1)
i = tonumber(i)
else
-- String doesn't contains an index, assume its index is the position we found it in.
i = varindex
end
varswap[i] = varindex
if p == "d" then return "(%d+)" end
if p == "s" then return "(.-)" end
-- Only know about strings and integers. Other types are broken.
--[[ assert(false, "Unknown pattern: %"..p) ]]
end
-- Used to cache results, so we don't produce multiple functions for the same string.
local known_patterns = {}
function QuestHelper:convertPattern(pattern)
local result = known_patterns[pattern]
if result then
return result
end
while(table.remove(varswap)) do end
varindex = 0
local pat = string.format("^%s$", string.gsub(pattern, "%%(.-[%%%a])", replacePattern))
if varindex == 0 then
-- The string doesn't contain any variables.
result = self.nop
else
local func = "local function parse(input)\n"
local linear = true
for i = 1,varindex do
if varswap[i] ~= i then
linear = false
break
end
end
if linear then
-- All the arguments are in order, we can just return them.
func = func .. string.format("return select(3, string.find(input, %q))", pat)
else
-- The order has been changed, use temporary variables.
for i = 1,varindex do
func = func ..(i==1 and "local " or ", ")..("n"..i)
end
func = func .. string.format(" = select(3, string.find(input, %q))\n", pat)
for i = 1,varindex do
func = func ..(i==1 and "return " or ", ")..(varswap[i] and ("n"..varswap[i]) or "nil")
end
end
func = func .. "\nend\nreturn parse\n"
result = loadstring(func)()
end
known_patterns[pattern] = result
return result
end