potatOS/minify/FormatMini.lua

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2021-03-31 18:58:54 +00:00
local parser = require'ParseLua'
local ParseLua = parser.ParseLua
local util = require'Util'
local lookupify = util.lookupify
--
-- FormatMini.lua
--
-- Returns the minified version of an AST. Operations which are performed:
-- - All comments and whitespace are ignored
-- - All local variables are renamed
--
local LowerChars = lookupify{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}
local UpperChars = lookupify{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'}
local Digits = lookupify{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
local Symbols = lookupify{'+', '-', '*', '/', '^', '%', ',', '{', '}', '[', ']', '(', ')', ';', '#'}
local function serialize_debug_symbols(map)
local out = {}
for k, v in pairs(map) do
table.insert(out, k .. "\t" .. v)
end
return table.concat(out, "\n")
end
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local function Format_Mini(ast)
local formatStatlist, formatExpr;
local count = 0
--
local function joinStatementsSafe(a, b, sep)
--print(a, b)
if count > 150 then
count = 0
return a.."\n"..b
end
sep = sep or ' '
local aa, bb = a:sub(-1,-1), b:sub(1,1)
if UpperChars[aa] or LowerChars[aa] or aa == '_' then
if not (UpperChars[bb] or LowerChars[bb] or bb == '_' or Digits[bb]) then
--bb is a symbol, can join without sep
return a..b
elseif bb == '(' then
print("==============>>>",aa,bb)
--prevent ambiguous syntax
return a..sep..b
else
return a..sep..b
end
elseif Digits[aa] then
if bb == '(' then
--can join statements directly
return a..b
elseif Symbols[bb] then
return a .. b
else
return a..sep..b
end
elseif aa == '' then
return a..b
else
if bb == '(' then
--don't want to accidentally call last statement, can't join directly
return a..sep..b
else
--print("asdf", '"'..a..'"', '"'..b..'"')
return a..b
end
end
end
formatExpr = function(expr, precedence)
local precedence = precedence or 0
local currentPrecedence = 0
local skipParens = false
local out = ""
if expr.AstType == 'VarExpr' then
if expr.Variable then
out = out..expr.Variable.Name
else
out = out..expr.Name
end
elseif expr.AstType == 'NumberExpr' then
out = out..expr.Value.Data
elseif expr.AstType == 'StringExpr' then
out = out..expr.Value.Data
elseif expr.AstType == 'BooleanExpr' then
out = out..tostring(expr.Value)
elseif expr.AstType == 'NilExpr' then
out = joinStatementsSafe(out, "nil")
elseif expr.AstType == 'BinopExpr' then
currentPrecedence = expr.OperatorPrecedence
out = joinStatementsSafe(out, formatExpr(expr.Lhs, currentPrecedence))
out = joinStatementsSafe(out, expr.Op)
out = joinStatementsSafe(out, formatExpr(expr.Rhs))
if expr.Op == '^' or expr.Op == '..' then
currentPrecedence = currentPrecedence - 1
end
if currentPrecedence < precedence then
skipParens = false
else
skipParens = true
end
--print(skipParens, precedence, currentPrecedence)
elseif expr.AstType == 'UnopExpr' then
out = joinStatementsSafe(out, expr.Op)
out = joinStatementsSafe(out, formatExpr(expr.Rhs))
elseif expr.AstType == 'DotsExpr' then
out = out.."..."
elseif expr.AstType == 'CallExpr' then
out = out..formatExpr(expr.Base)
out = out.."("
for i = 1, #expr.Arguments do
out = out..formatExpr(expr.Arguments[i])
if i ~= #expr.Arguments then
out = out..","
end
end
out = out..")"
elseif expr.AstType == 'TableCallExpr' then
out = out..formatExpr(expr.Base)
out = out..formatExpr(expr.Arguments[1])
elseif expr.AstType == 'StringCallExpr' then
out = out..formatExpr(expr.Base)
out = out..expr.Arguments[1].Data
elseif expr.AstType == 'IndexExpr' then
out = out..formatExpr(expr.Base).."["..formatExpr(expr.Index).."]"
elseif expr.AstType == 'MemberExpr' then
out = out..formatExpr(expr.Base)..expr.Indexer..expr.Ident.Data
elseif expr.AstType == 'Function' then
expr.Scope:ObfuscateVariables()
out = out.."function("
if #expr.Arguments > 0 then
for i = 1, #expr.Arguments do
out = out..expr.Arguments[i].Name
if i ~= #expr.Arguments then
out = out..","
elseif expr.VarArg then
out = out..",..."
end
end
elseif expr.VarArg then
out = out.."..."
end
out = out..")"
out = joinStatementsSafe(out, formatStatlist(expr.Body))
out = joinStatementsSafe(out, "end")
elseif expr.AstType == 'ConstructorExpr' then
out = out.."{"
for i = 1, #expr.EntryList do
local entry = expr.EntryList[i]
if entry.Type == 'Key' then
out = out.."["..formatExpr(entry.Key).."]="..formatExpr(entry.Value)
elseif entry.Type == 'Value' then
out = out..formatExpr(entry.Value)
elseif entry.Type == 'KeyString' then
out = out..entry.Key.."="..formatExpr(entry.Value)
end
if i ~= #expr.EntryList then
out = out..","
end
end
out = out.."}"
elseif expr.AstType == 'Parentheses' then
out = out.."("..formatExpr(expr.Inner)..")"
end
--print(">>", skipParens, expr.ParenCount, out)
if not skipParens then
--print("hehe")
out = string.rep('(', expr.ParenCount or 0) .. out
out = out .. string.rep(')', expr.ParenCount or 0)
--print("", out)
end
count = count + #out
return --[[print(out) or]] out
end
local formatStatement = function(statement)
local out = ''
if statement.AstType == 'AssignmentStatement' then
for i = 1, #statement.Lhs do
out = out..formatExpr(statement.Lhs[i])
if i ~= #statement.Lhs then
out = out..","
end
end
if #statement.Rhs > 0 then
out = out.."="
for i = 1, #statement.Rhs do
out = out..formatExpr(statement.Rhs[i])
if i ~= #statement.Rhs then
out = out..","
end
end
end
elseif statement.AstType == 'CallStatement' then
out = formatExpr(statement.Expression)
elseif statement.AstType == 'LocalStatement' then
out = out.."local "
for i = 1, #statement.LocalList do
out = out..statement.LocalList[i].Name
if i ~= #statement.LocalList then
out = out..","
end
end
if #statement.InitList > 0 then
out = out.."="
for i = 1, #statement.InitList do
out = out..formatExpr(statement.InitList[i])
if i ~= #statement.InitList then
out = out..","
end
end
end
elseif statement.AstType == 'IfStatement' then
out = joinStatementsSafe("if", formatExpr(statement.Clauses[1].Condition))
out = joinStatementsSafe(out, "then")
out = joinStatementsSafe(out, formatStatlist(statement.Clauses[1].Body))
for i = 2, #statement.Clauses do
local st = statement.Clauses[i]
if st.Condition then
out = joinStatementsSafe(out, "elseif")
out = joinStatementsSafe(out, formatExpr(st.Condition))
out = joinStatementsSafe(out, "then")
else
out = joinStatementsSafe(out, "else")
end
out = joinStatementsSafe(out, formatStatlist(st.Body))
end
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'WhileStatement' then
out = joinStatementsSafe("while", formatExpr(statement.Condition))
out = joinStatementsSafe(out, "do")
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'DoStatement' then
out = joinStatementsSafe(out, "do")
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'ReturnStatement' then
out = "return"
for i = 1, #statement.Arguments do
out = joinStatementsSafe(out, formatExpr(statement.Arguments[i]))
if i ~= #statement.Arguments then
out = out..","
end
end
elseif statement.AstType == 'BreakStatement' then
out = "break"
elseif statement.AstType == 'RepeatStatement' then
out = "repeat"
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "until")
out = joinStatementsSafe(out, formatExpr(statement.Condition))
elseif statement.AstType == 'Function' then
statement.Scope:ObfuscateVariables()
if statement.IsLocal then
out = "local"
end
out = joinStatementsSafe(out, "function ")
if statement.IsLocal then
out = out..statement.Name.Name
else
out = out..formatExpr(statement.Name)
end
out = out.."("
if #statement.Arguments > 0 then
for i = 1, #statement.Arguments do
out = out..statement.Arguments[i].Name
if i ~= #statement.Arguments then
out = out..","
elseif statement.VarArg then
--print("Apply vararg")
out = out..",..."
end
end
elseif statement.VarArg then
out = out.."..."
end
out = out..")"
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'GenericForStatement' then
statement.Scope:ObfuscateVariables()
out = "for "
for i = 1, #statement.VariableList do
out = out..statement.VariableList[i].Name
if i ~= #statement.VariableList then
out = out..","
end
end
out = out.." in"
for i = 1, #statement.Generators do
out = joinStatementsSafe(out, formatExpr(statement.Generators[i]))
if i ~= #statement.Generators then
out = joinStatementsSafe(out, ',')
end
end
out = joinStatementsSafe(out, "do")
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'NumericForStatement' then
statement.Scope:ObfuscateVariables()
out = "for "
out = out..statement.Variable.Name.."="
out = out..formatExpr(statement.Start)..","..formatExpr(statement.End)
if statement.Step then
out = out..","..formatExpr(statement.Step)
end
out = joinStatementsSafe(out, "do")
out = joinStatementsSafe(out, formatStatlist(statement.Body))
out = joinStatementsSafe(out, "end")
elseif statement.AstType == 'Comment' then
-- ignore
elseif statement.AstType == 'Eof' then
-- ignore
else
print("Unknown AST Type: " .. statement.AstType)
end
count = count + #out
return out
end
local map = {}
local function insert(t)
for k, v in pairs(t) do
map[k] = v
end
end
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formatStatlist = function(statList)
local out = ''
statList.Scope:ObfuscateVariables()
insert(statList.Scope.name_map or {})
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for _, stat in pairs(statList.Body) do
out = joinStatementsSafe(out, formatStatement(stat), ';')
end
return out
end
ast.Scope:ObfuscateVariables()
insert(ast.Scope.name_map)
return formatStatlist(ast), serialize_debug_symbols(map)
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end
return Format_Mini