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|
local parser = require 'parser'
local pos
local defs = {}
local scopes
local result
local namePos
local colonPos
local DUMMY_TABLE = {}
local function scopeInit()
scopes = {{}}
end
local function scopeSet(obj)
local scope = scopes[#scopes]
local name = obj[1]
scope[name] = obj
end
local function scopeGet(name)
for i = #scopes, 1, -1 do
local scope = scopes[i]
local obj = scope[name]
if obj then
return obj
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
result = scopeGet(name)
end
function defs.NamePos(p)
namePos = p
end
function defs.Name(str)
checkDifinition(str, namePos)
return {str, namePos}
end
function defs.DOTSPos(p)
namePos = p
end
function defs.DOTS(str)
checkDifinition(str, namePos)
return {str, namePos}
end
function defs.COLONPos(p)
colonPos = p
end
function defs.ColonName(name)
name.colon = colonPos
return name
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.ArgList(...)
if ... == '' then
return DUMMY_TABLE
end
return {...}
end
function defs.FuncName(...)
if ... == '' then
return DUMMY_TABLE
end
return {...}
end
function defs.FunctionDef(names, args)
if #names == 1 then
scopeSet(names[1])
end
scopePush()
-- 判断隐藏的局部变量self
if #names > 0 then
local name = names[#names]
if name.colon then
scopeSet {'self', name.colon, name.colon}
end
end
for _, arg in ipairs(args) do
scopeSet(arg)
end
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()
local suc, err = parser.grammar(buf, 'Lua', defs)
if not suc then
return false, '语法错误', err
end
if not result then
return false, 'No word'
end
local name, start, finish = result[1], result[2], result[3]
if not start then
return false, 'No match'
end
if not finish then
finish = start + #name - 1
end
return true, start, finish
end
|
