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
|
local module = {}
setmetatable(module, {__index=_G})
setfenv(1, module)
local Grammar = {}
function module.createGrammar(nonterminals, triggers)
local self = {
nonterminals = nonterminals,
triggers = triggers,
context = {},
}
setmetatable(self, {__index=Grammar})
return self
end
function Grammar.pushContext(self)
local newContext = {}
setmetatable(newContext, {__index=self.context})
self.context = newContext
end
function Grammar.popContext(self)
local mt = getmetatable(self.context)
local oldContext = (mt and mt.__index) or {}
self.context = oldContext
end
function Grammar.expandSymbol(self, sequence, index, expansion)
table.remove(sequence, index)
for i=1,#expansion do
table.insert(sequence, index+i-1, expansion[i])
end
end
function Grammar.expandSequence(self, sequence, n, debug)
local i = 1
while i <= #sequence do
if debug then print(sequence[i]) end
local choices = self.nonterminals[sequence[i]] or self.context[sequence[i]]
if choices then
local trigger = self.triggers[sequence[i]]
if trigger then trigger(self) end
if #choices == 1 then
self:expandSymbol(sequence, i, choices[1])
return true, 0
else
local choice = choices[1 + (n % #choices)]
self:expandSymbol(sequence, i, choice)
return true, 1
end
else
i = i+1
end
end
return false, 0
end
function Grammar.expand(self, genome, geneIndex, maxLoops, debug)
geneIndex = geneIndex or 0
maxLoops = maxLoops or 2
local sequence = { '<start>' }
local count = 0
local continue = true
while continue do
local gene
if (count > maxLoops * #genome) then
gene = 0
else
gene = genome[1 + (geneIndex % #genome)]
end
local increment
if debug then print(geneIndex, gene) end
continue, increment = self:expandSequence(sequence, gene, debug)
if not continue then break end
geneIndex = geneIndex+increment
count = count + 1
end
local result = ''
for _, s in ipairs(sequence) do
result = result .. s
end
return result, geneIndex
end
return module
|
