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- -------------------------------------------------------------------------------
- -- Wrapper for emulating a read-only table
- -- Author: Valentin Niess
- -- License: GNU LGPL-3.0
- -------------------------------------------------------------------------------
- local error = require('pumas.error')
- local metatype_ = require('pumas.metatype')
-
- local readonly = {}
-
- -------------------------------------------------------------------------------
- -- Local bookmarking of readonly tables
- -------------------------------------------------------------------------------
- local instances = setmetatable({}, {__mode = 'k'})
-
- function readonly.rawget (t) return instances[t].table end
-
-
- -------------------------------------------------------------------------------
- -- The Readonly metatype
- -------------------------------------------------------------------------------
- -- XXX clone method for Readonly tables?
- local Readonly = {}
-
- Readonly.__metatable = 'Readonly'
-
-
- do
- -- Vanilla Lua 5.1 does not have the __pairs and __ipairs metamethods.
- -- Therefore we provide explicit iterators
- local function ipairs_ (self)
- if self == nil then
- error.raise{fname = 'ipairs', argnum = 1, expected = 'a table',
- got = 'nil'}
- end
-
- self = instances[self]
- return ipairs(self.table)
- end
-
- local function pairs_ (self)
- if self == nil then
- error.raise{fname = 'pairs', argnum = 1, expected = 'a table',
- got = 'nil'}
- end
-
- self = instances[self]
- return pairs(self.table)
- end
-
- local inspect
-
- local function inspect_ (self)
- if self == nil then
- error.raise{fname = 'inspect', argnum = 1, expected = 'a table',
- got = 'nil'}
- end
-
- if not inspect then
- local ok, result = pcall(require, 'inspect')
- if not ok then
- error.raise{fname = 'inspect', description = result}
- else
- inspect = result
- end
- end
-
- return inspect(instances[self], {process = function (item)
- return instances[item] or item
- end})
- end
-
- error.register('Readonly.__ipairs', ipairs_)
- error.register('Readonly.__pairs', pairs_)
- error.register('Readonly.__index.inspect', inspect_)
-
- function Readonly:__index (k)
- if k == 'inspect' then
- return inspect_
- elseif k == 'ipairs' then
- return ipairs_
- elseif k == 'pairs' then
- return pairs_
- else
- self = instances[self]
- if k == '__metatype' then
- return self.metatype
- else
- return self.table[k]
- end
- end
- end
- end
-
-
- function Readonly:__newindex (k)
- self = instances[self]
- error.raise{['type'] = self.type, not_mutable = k}
- end
-
-
- function Readonly:__len ()
- self = instances[self]
- return #self.table
- end
-
-
- function Readonly:__tostring ()
- self = instances[self]
- return tostring(self.table)
- end
-
-
- -------------------------------------------------------------------------------
- -- The Readonly constructor
- -------------------------------------------------------------------------------
- do
- local function wrap (cls, t, type_, metatype)
- if metatype_(t) ~= 'table' then
- error.raise{fname = 'Readonly', argnum = 1,
- expected = 'a raw table', got = metatype_.a(t)}
- elseif getmetatable(t) ~= nil then
- error.raise{fname = 'Readonly', argnum = 1,
- expected = 'a raw table', got = 'a metatable'}
- end
-
- if type_ == nil then
- type_ = 'table'
- elseif type(type_) ~= 'string' then
- error.raise{fname = 'Readonly', argnum = 2,
- expected = 'a string', got = metatype_.a(type_)}
- end
-
- if (metatype ~= nil) and (type(metatype) ~= 'string') then
- error.raise{fname = 'Readonly', argnum = 3,
- expected = 'a string', got = metatype_.a(metatype)}
- end
-
- local self = {}
- instances[self] = {table = t, ['type'] = type_, metatype = metatype}
-
- return setmetatable(self, cls)
- end
-
- readonly.Readonly = setmetatable(Readonly, {__call = wrap})
-
- error.register('Readonly', Readonly)
- end
-
-
- -------------------------------------------------------------------------------
- -- Return the sub-package
- -------------------------------------------------------------------------------
- return readonly