highlightlua.lua

-- This Script is Part of the Prometheus Obfuscator by levno-710
--
-- highlightlua.lua
--
-- This Script provides a simple Method for Syntax Highlighting of Lua code

local Tokenizer = require("prometheus.tokenizer");
local colors = require("colors");
local TokenKind = Tokenizer.TokenKind;
local lookupify = require("prometheus.util").lookupify;

return function(code, luaVersion)
    local out = "";
    local tokenizer = Tokenizer:new({
        LuaVersion = luaVersion,
    });

    tokenizer:append(code);
    local tokens = tokenizer:scanAll();

    local nonColorSymbols = lookupify{
        ",", ";", "(", ")", "{", "}", ".", ":", "[", "]"
    }

    local defaultGlobals = lookupify{
        "string", "table", "bit32", "bit"
    }

    local currentPos = 1;
    for _, token in ipairs(tokens) do
        if token.startPos >= currentPos then
            out = out .. string.sub(code, currentPos, token.startPos);
        end
        if token.kind == TokenKind.Ident then
            if defaultGlobals[token.source] then
                out = out .. colors(token.source, "red");
            else
                out = out .. token.source;
            end
        elseif token.kind == TokenKind.Keyword then
            if token.source == "nil" then
                out = out .. colors(token.source, "yellow");
            else
                out = out .. colors(token.source, "yellow");
            end
        elseif token.kind == TokenKind.Symbol then
            if nonColorSymbols[token.source] then
                out = out .. token.source;
            else
                out = out .. colors(token.source, "yellow");
            end
        elseif token.kind == TokenKind.String then
            out = out .. colors(token.source, "green")
        elseif token.kind == TokenKind.Number then
            out = out .. colors(token.source, "red")
        else
            out = out .. token.source;
        end

        currentPos = token.endPos + 1;
    end
    return out;
end