summaryrefslogtreecommitdiff
path: root/src/matcher/definition.lua
blob: bf7457e73c4eed38fb7cbcc85a3229f06b3d7ea9 (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
local parser = require 'parser'

local pos
local defs = {}
local scopes
local result
local namePos

local function getResult(name, p)
    result = {name, p}
end

local function scopeInit()
    scopes = {{}}
end

local function scopeSet(name)
    local scope = scopes[#scopes]
    scope[name[1]] = name[2]
end

local function scopeGet(name)
    for i = #scopes, 1, -1 do
        local scope = scopes[i]
        local p = scope[name]
        if p then
            return p
        end
    end
    return nil
end

local function scopePush()
    scopes[#scopes+1] = {}
end

local function scopePop()
    scopes[#scopes] = nil
end

local function checkDifinition(name, p)
    if pos < p or pos > p + #name then
        return
    end
    getResult(name, scopeGet(name))
end

function defs.NamePos(p)
    namePos = p
end

function defs.Name(str)
    checkDifinition(str, namePos)
    return {str, namePos}
end

function defs.LocalVar(names)
    for _, name in ipairs(names) do
        scopeSet(name)
    end
end

function defs.LocalSet(names)
    for _, name in ipairs(names) do
        scopeSet(name)
    end
end

function defs.FunctionDef(names)
    if #names == 1 then
        scopeSet(names[1])
    end
    scopePush()
end

function defs.Function()
    scopePop()
end

function defs.DoDef()
    scopePush()
end

function defs.Do()
    scopePop()
end

function defs.IfDef()
    scopePush()
end

function defs.If()
    scopePop()
end

function defs.ElseIfDef()
    scopePush()
end

function defs.ElseIf()
    scopePop()
end

function defs.ElseDef()
    scopePush()
end

function defs.Else()
    scopePop()
end

function defs.LoopDef(name)
    scopePush()
    scopeSet(name)
end

function defs.Loop()
    scopePop()
end

function defs.LoopStart(name, exp)
    return name
end

function defs.NameList(...)
    return {...}
end

function defs.InDef(names)
    scopePush()
    for _, name in ipairs(names) do
        scopeSet(name)
    end
end

function defs.In()
    scopePop()
end

function defs.WhileDef()
    scopePush()
end

function defs.While()
    scopePop()
end

function defs.RepeatDef()
    scopePush()
end

function defs.Until()
    scopePop()
end

return function (buf, pos_)
    pos = pos_
    result = nil
    scopeInit()

    parser.grammar(buf, 'Lua', defs)

    if not result then
        return false, 'No word'
    end
    local name, start = result[1], result[2]
    if not start then
        return false, 'No match'
    end
    return true, start, start + #name - 1
end