169 lines
3.3 KiB
Lua
169 lines
3.3 KiB
Lua
function in_site(var)
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return var
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end
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function in_domain(var)
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return var
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end
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local function path_to_string(path)
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return table.concat(path, '/')
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end
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local function array_to_string(array)
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return '[' .. table.concat(array, ', ') .. ']'
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end
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local function var_error(path, val, msg)
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print(string.format('*** site.conf error: expected %s to %s, but it is %s', path_to_string(path), msg, tostring(val)))
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os.exit(1)
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end
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function extend(path, c)
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local p = {unpack(path)}
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for _, e in ipairs(c) do
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p[#p+1] = e
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end
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return p
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end
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local function loadpath(path, base, c, ...)
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if not c or base == nil then
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return base
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end
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if type(base) ~= 'table' then
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var_error(path, base, 'be a table')
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end
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return loadpath(extend(path, {c}), base[c], ...)
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end
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local function loadvar(path)
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return loadpath({}, site, unpack(path))
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end
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local function check_type(t)
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return function(val)
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return type(val) == t
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end
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end
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local function check_one_of(array)
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return function(val)
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for _, v in ipairs(array) do
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if v == val then
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return true
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end
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end
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return false
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end
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end
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function need(path, check, required, msg)
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local val = loadvar(path)
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if required == false and val == nil then
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return nil
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end
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if not check(val) then
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var_error(path, val, msg)
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end
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return val
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end
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local function need_type(path, type, required, msg)
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return need(path, check_type(type), required, msg)
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end
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function need_alphanumeric_key(path)
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local val = path[#path]
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-- We don't use character classes like %w here to be independent of the locale
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if not val:match('^[0-9a-zA-Z_]+$') then
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var_error(path, val, 'have a key using only alphanumeric characters and underscores')
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end
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end
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function need_string(path, required)
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return need_type(path, 'string', required, 'be a string')
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end
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function need_string_match(path, pat, required)
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local val = need_string(path, required)
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if not val then
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return nil
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end
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if not val:match(pat) then
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var_error(path, val, "match pattern '" .. pat .. "'")
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end
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return val
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end
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function need_number(path, required)
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return need_type(path, 'number', required, 'be a number')
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end
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function need_boolean(path, required)
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return need_type(path, 'boolean', required, 'be a boolean')
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end
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function need_array(path, subcheck, required)
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local val = need_type(path, 'table', required, 'be an array')
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if not val then
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return nil
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end
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if subcheck then
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for i = 1, #val do
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subcheck(extend(path, {i}))
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end
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end
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return val
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end
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function need_table(path, subcheck, required)
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local val = need_type(path, 'table', required, 'be a table')
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if not val then
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return nil
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end
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if subcheck then
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for k, _ in pairs(val) do
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subcheck(extend(path, {k}))
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end
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end
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return val
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end
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function need_value(path, value, required)
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return need(path, function(v)
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return v == value
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end, required, 'be ' .. tostring(value))
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end
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function need_one_of(path, array, required)
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return need(path, check_one_of(array), required, 'be one of the given array ' .. array_to_string(array))
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end
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function need_string_array(path, required)
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return need_array(path, need_string, required)
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end
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function need_string_array_match(path, pat, required)
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return need_array(path, function(e) need_string_match(e, pat) end, required)
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end
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function need_array_of(path, array, required)
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return need_array(path, function(e) need_one_of(e, array) end, required)
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end
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