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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.DOTSPos(p)
namePos = p
end
function defs.DOTS(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, args)
if #names == 1 then
scopeSet(names[1])
end
for _, arg in ipairs(args) do
scopeSet(arg)
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
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