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local function split_version(version)
local parts = {}
for part in version:gmatch "[^.]+" do
table.insert(parts, tonumber(part) or part)
end
return parts
end
local function compare_versions(version1, version2)
local v1_parts = split_version(version1)
local v2_parts = split_version(version2)
local len = math.max(#v1_parts, #v2_parts)
for i = 1, len do
local v1_part = v1_parts[i] or 0
local v2_part = v2_parts[i] or 0
if v1_part < v2_part then
return -1
elseif v1_part > v2_part then
return 1
end
end
return 0
end
local function check_single_specifier(version, specifier)
local operator, spec_version = specifier:match "^([<>=!~]+)%s*(.+)$"
local comp_result = compare_versions(version, spec_version)
if operator == "==" then
return comp_result == 0
elseif operator == "!=" then
return comp_result ~= 0
elseif operator == "<=" then
return comp_result <= 0
elseif operator == "<" then
return comp_result < 0
elseif operator == ">=" then
return comp_result >= 0
elseif operator == ">" then
return comp_result > 0
elseif operator == "~=" then
if comp_result < 0 then
return false
end
local spec_version_components = split_version(spec_version)
local version_components = split_version(version)
for i = 1, #spec_version_components - 1 do
if spec_version_components[i] ~= version_components[i] then
return false
end
end
return true
else
error("Unknown operator in version specifier: " .. operator)
end
end
local function check_version(version, specifiers)
for specifier in specifiers:gmatch "[^,]+" do
if not check_single_specifier(version, specifier:match "^%s*(.-)%s*$") then
return false
end
end
return true
end
return {
check_version = check_version,
}
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