summaryrefslogtreecommitdiff
path: root/lualibs-util-sto.lua
blob: 8aafca425b8ae9c76167d7e1d358eefa9affced2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
if not modules then modules = { } end modules ['util-sto'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local setmetatable, getmetatable, type = setmetatable, getmetatable, type

utilities         = utilities or { }
utilities.storage = utilities.storage or { }
local storage     = utilities.storage

function storage.mark(t)
    if not t then
        print("\nfatal error: storage cannot be marked\n")
        os.exit()
        return
    end
    local m = getmetatable(t)
    if not m then
        m = { }
        setmetatable(t,m)
    end
    m.__storage__ = true
    return t
end

function storage.allocate(t)
    t = t or { }
    local m = getmetatable(t)
    if not m then
        m = { }
        setmetatable(t,m)
    end
    m.__storage__ = true
    return t
end

function storage.marked(t)
    local m = getmetatable(t)
    return m and m.__storage__
end

function storage.checked(t)
    if not t then
        report("\nfatal error: storage has not been allocated\n")
        os.exit()
        return
    end
    return t
end

-- function utilities.storage.delay(parent,name,filename)
--     local m = getmetatable(parent)
--     m.__list[name] = filename
-- end
--
-- function utilities.storage.predefine(parent)
--     local list = { }
--     local m = getmetatable(parent) or {
--         __list = list,
--         __index = function(t,k)
--             local l = require(list[k])
--             t[k] = l
--             return l
--         end
--     }
--     setmetatable(parent,m)
-- end
--
-- bla = { }
-- utilities.storage.predefine(bla)
-- utilities.storage.delay(bla,"test","oepsoeps")
-- local t = bla.test
-- table.print(t)
-- print(t.a)

function storage.setinitializer(data,initialize)
    local m = getmetatable(data) or { }
    m.__index = function(data,k)
        m.__index = nil -- so that we can access the entries during initializing
        initialize()
        return data[k]
    end
    setmetatable(data, m)
end

local keyisvalue = { __index = function(t,k)
    t[k] = k
    return k
end }

function storage.sparse(t)
    t = t or { }
    setmetatable(t,keyisvalue)
    return t
end

-- table namespace ?

local function f_empty ()                           return "" end -- t,k
local function f_self  (t,k) t[k] = k               return k  end
local function f_table (t,k) local v = { } t[k] = v return v  end
local function f_number(t,k) t[k] = 0               return 0  end -- t,k,v
local function f_ignore()                                     end -- t,k,v

local f_index = {
    ["empty"]  = f_empty,
    ["self"]   = f_self,
    ["table"]  = f_table,
    ["number"] = f_number,
}

local t_index = {
    ["empty"]  = { __index = f_empty  },
    ["self"]   = { __index = f_self   },
    ["table"]  = { __index = f_table  },
    ["number"] = { __index = f_number },
}

function table.setmetatableindex(t,f)
    if type(t) ~= "table" then
        f, t = t, { }
    end
    local m = getmetatable(t)
    if m then
        m.__index = f_index[f] or f
    else
        setmetatable(t,t_index[f] or { __index = f })
    end
    return t
end

local f_index = {
    ["ignore"] = f_ignore,
}

local t_index = {
    ["ignore"] = { __newindex = f_ignore },
}

function table.setmetatablenewindex(t,f)
    if type(t) ~= "table" then
        f, t = t, { }
    end
    local m = getmetatable(t)
    if m then
        m.__newindex = f_index[f] or f
    else
        setmetatable(t,t_index[f] or { __newindex = f })
    end
    return t
end

function table.setmetatablecall(t,f)
    if type(t) ~= "table" then
        f, t = t, { }
    end
    local m = getmetatable(t)
    if m then
        m.__call = f
    else
        setmetatable(t,{ __call = f })
    end
    return t
end

function table.setmetatablekey(t,key,value)
    local m = getmetatable(t)
    if not m then
        m = { }
        setmetatable(t,m)
    end
    m[key] = value
    return t
end

function table.getmetatablekey(t,key,value)
    local m = getmetatable(t)
    return m and m[key]
end