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local tonumber = tonumber
local string_char = string.char
local utf8_char = utf8.char
local defs = {
Nil = function (pos)
return {
type = 'nil',
start = pos,
finish = pos + 2,
}
end,
True = function (pos)
return {
type = 'boolean',
start = pos,
finish = pos + 3,
[1] = true,
}
end,
False = function (pos)
return {
type = 'boolean',
start = pos,
finish = pos + 4,
[1] = false,
}
end,
String = function (start, str, finish)
return {
type = 'string',
start = start,
finish = finish - 1,
[1] = str,
}
end,
Char10 = function (char)
char = tonumber(char)
if not char or char < 0 or char > 255 then
-- TODO 记录错误
return ''
end
return string_char(char)
end,
Char16 = function (char)
return string_char(tonumber(char, 16))
end,
CharUtf8 = function (char)
char = tonumber(char, 16)
if not char or char < 0 or char > 0x10ffff then
-- TODO 记录错误
return ''
end
return utf8_char(char)
end,
Number = function (start, number, finish)
return {
type = 'number',
start = start,
finish = finish - 1,
[1] = tonumber(number),
}
end,
Name = function (start, str, finish)
return {
type = 'name',
start = start,
finish = finish - 1,
[1] = str,
}
end,
Simple = function (first, ...)
if ... then
return {
type = 'simple',
first, ...,
}
elseif first == '' then
return nil
else
return first
end
end,
Index = function (exp)
exp.index = true
return exp
end,
Call = function (start, arg, finish)
if arg == nil then
return {
type = 'call',
start = start,
finish = finish - 1,
}
end
if arg.type == 'list' then
arg.type = 'call'
arg.start = start
arg.finish = finish - 1
return arg
end
local obj = {
type = 'call',
start = start,
finish = finish - 1,
[1] = arg,
}
return obj
end,
Binary = function (...)
local e1, op = ...
if not op then
return e1
end
local args = {...}
local e1 = args[1]
local e2
for i = 2, #args, 2 do
op, e2 = args[i], args[i+1]
e1 = {
type = 'binary',
op = op,
[1] = e1,
[2] = e2,
}
end
return e1
end,
Unary = function (...)
local e1, op = ...
if not op then
return e1
end
local args = {...}
local e1 = args[#args]
for i = #args - 1, 1, -1 do
op = args[i]
e1 = {
type = 'unary',
op = op,
[1] = e1,
}
end
return e1
end,
DOTS = function (start)
return {
type = '...',
start = start,
finish = start + 2,
}
end,
COLON = function (start)
return {
type = ':',
start = start,
finish = start,
}
end,
Function = function (start, name, arg, ...)
local obj = {
type = 'function',
start = start,
name = name,
arg = arg,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
LocalFunction = function (start, name, arg, ...)
local obj = {
type = 'localfunction',
start = start,
name = name,
arg = arg,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
Table = function (start, table, finish)
if table then
table.start = start
table.finish = finish - 1
else
table = {
type = 'table',
start = start,
finish = finish - 1,
}
end
return table
end,
TableFields = function (...)
if ... == '' then
return nil
else
return {
type = 'table',
...,
}
end
end,
NewField = function (key, value)
return {
type = 'pair',
key, value,
}
end,
NewIndex = function (key, value)
key.index = true
return {
type = 'pair',
key, value,
}
end,
List = function (first, second, ...)
if second then
return {
type = 'list',
first, second, ...
}
elseif first == '' then
return nil
else
return first
end
end,
Set = function (keys, values)
return {
type = 'set',
keys, values,
}
end,
Local = function (keys, values)
return {
type = 'local',
keys, values,
}
end,
DoBody = function (...)
if ... == '' then
return {
type = 'do',
}
else
return {
type = 'do',
...
}
end
end,
Do = function (start, action, finish)
action.start = start
action.finish = finish - 1
return action
end,
Break = function ()
return {
type = 'break',
}
end,
Return = function (exp)
if exp == nil or exp == '' then
exp = {
type = 'return'
}
else
if exp.type == 'list' then
exp.type = 'return'
else
exp = {
type = 'return',
[1] = exp,
}
end
end
return exp
end,
Label = function (name)
name.type = 'label'
return name
end,
GoTo = function (name)
name.type = 'goto'
return name
end,
IfBlock = function (exp, ...)
return {
filter = exp,
...
}
end,
ElseIfBlock = function (exp, ...)
return {
filter = exp,
...
}
end,
ElseBlock = function (...)
return {
...
}
end,
If = function (start, ...)
local obj = {
type = 'if',
start = start,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
LoopDef = function (arg, min, max, step)
return arg, min, max, step
end,
Loop = function (start, arg, min, max, step, ...)
local obj = {
type = 'loop',
start = start,
arg = arg,
min = min,
max = max,
step = step,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
In = function (start, arg, exp, ...)
local obj = {
type = 'in',
start = start,
arg = arg,
exp = exp,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
While = function (start, filter, ...)
local obj = {
type = 'while',
start = start,
filter = filter,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj[max] = nil
return obj
end,
Repeat = function (start, ...)
local obj = {
type = 'repeat',
start = start,
...
}
local max = #obj
obj.finish = obj[max] - 1
obj.filter = obj[max-1]
obj[max] = nil
obj[max-1] = nil
return obj
end,
Lua = function (...)
return {...}
end,
}
return function (self, lua, mode)
local gram, err = self.grammar(lua, mode, defs)
if not gram then
return nil, err
end
return gram
end
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