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Filename : conversion.js
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#! /usr/bin/env node

'use strict';

const fs = require('fs');
const path = require('path');

const args = process.argv.slice(2);
const dir = args[0];
if (!dir) {
  console.log('Usage: node ' + path.basename(__filename) + ' <target-dir>');
  process.exit(1);
}

const NodeApiVersion = require('../package.json').version;

const disable = args[1];
let ConfigFileOperations;
if (disable !== '--disable' && dir !== '--disable') {
  ConfigFileOperations = {
    'package.json': [
      [/([ ]*)"dependencies": {/g, '$1"dependencies": {\n$1  "node-addon-api": "' + NodeApiVersion + '",'],
      [/[ ]*"nan": *"[^"]+"(,|)[\n\r]/g, '']
    ],
    'binding.gyp': [
      [/([ ]*)'include_dirs': \[/g, '$1\'include_dirs\': [\n$1  \'<!(node -p "require(\\\'node-addon-api\\\').include_dir")\','],
      [/([ ]*)"include_dirs": \[/g, '$1"include_dirs": [\n$1  "<!(node -p \\"require(\'node-addon-api\').include_dir\\")",'],
      [/[ ]*("|')<!\(node -e ("|'|\\"|\\')require\(("|'|\\"|\\')nan("|'|\\"|\\')\)("|'|\\"|\\')\)("|')(,|)[\r\n]/g, ''],
      [/([ ]*)("|')target_name("|'): ("|')(.+?)("|'),/g, '$1$2target_name$2: $4$5$6,\n      $2cflags!$2: [ $2-fno-exceptions$2 ],\n      $2cflags_cc!$2: [ $2-fno-exceptions$2 ],\n      $2xcode_settings$2: { $2GCC_ENABLE_CPP_EXCEPTIONS$2: $2YES$2,\n        $2CLANG_CXX_LIBRARY$2: $2libc++$2,\n        $2MACOSX_DEPLOYMENT_TARGET$2: $210.7$2,\n      },\n      $2msvs_settings$2: {\n        $2VCCLCompilerTool$2: { $2ExceptionHandling$2: 1 },\n      },']
    ]
  };
} else {
  ConfigFileOperations = {
    'package.json': [
      [/([ ]*)"dependencies": {/g, '$1"dependencies": {\n$1  "node-addon-api": "' + NodeApiVersion + '",'],
      [/[ ]*"nan": *"[^"]+"(,|)[\n\r]/g, '']
    ],
    'binding.gyp': [
      [/([ ]*)'include_dirs': \[/g, '$1\'include_dirs\': [\n$1  \'<!(node -p "require(\\\'node-addon-api\\\').include_dir")\','],
      [/([ ]*)"include_dirs": \[/g, '$1"include_dirs": [\n$1  "<!(node -p \'require(\\"node-addon-api\\").include_dir\')",'],
      [/[ ]*("|')<!\(node -e ("|'|\\"|\\')require\(("|'|\\"|\\')nan("|'|\\"|\\')\)("|'|\\"|\\')\)("|')(,|)[\r\n]/g, ''],
      [/([ ]*)("|')target_name("|'): ("|')(.+?)("|'),/g, '$1$2target_name$2: $4$5$6,\n      $2cflags!$2: [ $2-fno-exceptions$2 ],\n      $2cflags_cc!$2: [ $2-fno-exceptions$2 ],\n      $2defines$2: [ $2NAPI_DISABLE_CPP_EXCEPTIONS$2 ],\n      $2conditions$2: [\n        [\'OS=="win"\', { $2defines$2: [ $2_HAS_EXCEPTIONS=1$2 ] }]\n      ]']
    ]
  };
}

const SourceFileOperations = [
  [/Nan::SetMethod\(target,[\s]*"(.*)"[\s]*,[\s]*([^)]+)\)/g, 'exports.Set(Napi::String::New(env, "$1"), Napi::Function::New(env, $2))'],

  [/v8::Local<v8::FunctionTemplate>\s+(\w+)\s*=\s*Nan::New<FunctionTemplate>\([\w\d:]+\);(?:\w+->Reset\(\1\))?\s+\1->SetClassName\(Nan::String::New\("(\w+)"\)\);/g, 'Napi::Function $1 = DefineClass(env, "$2", {'],
  [/Local<FunctionTemplate>\s+(\w+)\s*=\s*Nan::New<FunctionTemplate>\([\w\d:]+\);\s+(\w+)\.Reset\((\1)\);\s+\1->SetClassName\((Nan::String::New|Nan::New<(v8::)*String>)\("(.+?)"\)\);/g, 'Napi::Function $1 = DefineClass(env, "$6", {'],
  [/Local<FunctionTemplate>\s+(\w+)\s*=\s*Nan::New<FunctionTemplate>\([\w\d:]+\);(?:\w+->Reset\(\1\))?\s+\1->SetClassName\(Nan::String::New\("(\w+)"\)\);/g, 'Napi::Function $1 = DefineClass(env, "$2", {'],
  [/Nan::New<v8::FunctionTemplate>\(([\w\d:]+)\)->GetFunction\(\)/g, 'Napi::Function::New(env, $1)'],
  [/Nan::New<FunctionTemplate>\(([\w\d:]+)\)->GetFunction()/g, 'Napi::Function::New(env, $1);'],
  [/Nan::New<v8::FunctionTemplate>\(([\w\d:]+)\)/g, 'Napi::Function::New(env, $1)'],
  [/Nan::New<FunctionTemplate>\(([\w\d:]+)\)/g, 'Napi::Function::New(env, $1)'],

  // FunctionTemplate to FunctionReference
  [/Nan::Persistent<(v8::)*FunctionTemplate>/g, 'Napi::FunctionReference'],
  [/Nan::Persistent<(v8::)*Function>/g, 'Napi::FunctionReference'],
  [/v8::Local<v8::FunctionTemplate>/g, 'Napi::FunctionReference'],
  [/Local<FunctionTemplate>/g, 'Napi::FunctionReference'],
  [/v8::FunctionTemplate/g, 'Napi::FunctionReference'],
  [/FunctionTemplate/g, 'Napi::FunctionReference'],

  [/([ ]*)Nan::SetPrototypeMethod\(\w+, "(\w+)", (\w+)\);/g, '$1InstanceMethod("$2", &$3),'],
  [/([ ]*)(?:\w+\.Reset\(\w+\);\s+)?\(target\)\.Set\("(\w+)",\s*Nan::GetFunction\((\w+)\)\);/gm,
    '});\n\n' +
    '$1constructor = Napi::Persistent($3);\n' +
    '$1constructor.SuppressDestruct();\n' +
    '$1target.Set("$2", $3);'],

  // TODO: Other attribute combinations
  [/static_cast<PropertyAttribute>\(ReadOnly\s*\|\s*DontDelete\)/gm,
    'static_cast<napi_property_attributes>(napi_enumerable | napi_configurable)'],

  [/([\w\d:<>]+?)::Cast\((.+?)\)/g, '$2.As<$1>()'],

  [/\*Nan::Utf8String\(([^)]+)\)/g, '$1->As<Napi::String>().Utf8Value().c_str()'],
  [/Nan::Utf8String +(\w+)\(([^)]+)\)/g, 'std::string $1 = $2.As<Napi::String>()'],
  [/Nan::Utf8String/g, 'std::string'],

  [/v8::String::Utf8Value (.+?)\((.+?)\)/g, 'Napi::String $1(env, $2)'],
  [/String::Utf8Value (.+?)\((.+?)\)/g, 'Napi::String $1(env, $2)'],
  [/\.length\(\)/g, '.Length()'],

  [/Nan::MakeCallback\(([^,]+),[\s\\]+([^,]+),/gm, '$2.MakeCallback($1,'],

  [/class\s+(\w+)\s*:\s*public\s+Nan::ObjectWrap/g, 'class $1 : public Napi::ObjectWrap<$1>'],
  [/(\w+)\(([^)]*)\)\s*:\s*Nan::ObjectWrap\(\)\s*(,)?/gm, '$1($2) : Napi::ObjectWrap<$1>()$3'],

  // HandleOKCallback to OnOK
  [/HandleOKCallback/g, 'OnOK'],
  // HandleErrorCallback to OnError
  [/HandleErrorCallback/g, 'OnError'],

  // ex. .As<Function>() to .As<Napi::Object>()
  [/\.As<v8::(Value|Boolean|String|Number|Object|Array|Symbol|External|Function)>\(\)/g, '.As<Napi::$1>()'],
  [/\.As<(Value|Boolean|String|Number|Object|Array|Symbol|External|Function)>\(\)/g, '.As<Napi::$1>()'],

  // ex. Nan::New<Number>(info[0]) to Napi::Number::New(info[0])
  [/Nan::New<(v8::)*Integer>\((.+?)\)/g, 'Napi::Number::New(env, $2)'],
  [/Nan::New\(([0-9.]+)\)/g, 'Napi::Number::New(env, $1)'],
  [/Nan::New<(v8::)*String>\("(.+?)"\)/g, 'Napi::String::New(env, "$2")'],
  [/Nan::New\("(.+?)"\)/g, 'Napi::String::New(env, "$1")'],
  [/Nan::New<(v8::)*(.+?)>\(\)/g, 'Napi::$2::New(env)'],
  [/Nan::New<(.+?)>\(\)/g, 'Napi::$1::New(env)'],
  [/Nan::New<(v8::)*(.+?)>\(/g, 'Napi::$2::New(env, '],
  [/Nan::New<(.+?)>\(/g, 'Napi::$1::New(env, '],
  [/Nan::NewBuffer\(/g, 'Napi::Buffer<char>::New(env, '],
  // TODO: Properly handle this
  [/Nan::New\(/g, 'Napi::New(env, '],

  [/\.IsInt32\(\)/g, '.IsNumber()'],
  [/->IsInt32\(\)/g, '.IsNumber()'],

  [/(.+?)->BooleanValue\(\)/g, '$1.As<Napi::Boolean>().Value()'],
  [/(.+?)->Int32Value\(\)/g, '$1.As<Napi::Number>().Int32Value()'],
  [/(.+?)->Uint32Value\(\)/g, '$1.As<Napi::Number>().Uint32Value()'],
  [/(.+?)->IntegerValue\(\)/g, '$1.As<Napi::Number>().Int64Value()'],
  [/(.+?)->NumberValue\(\)/g, '$1.As<Napi::Number>().DoubleValue()'],

  // ex. Nan::To<bool>(info[0]) to info[0].Value()
  [/Nan::To<v8::(Boolean|String|Number|Object|Array|Symbol|Function)>\((.+?)\)/g, '$2.To<Napi::$1>()'],
  [/Nan::To<(Boolean|String|Number|Object|Array|Symbol|Function)>\((.+?)\)/g, '$2.To<Napi::$1>()'],
  // ex. Nan::To<bool>(info[0]) to info[0].As<Napi::Boolean>().Value()
  [/Nan::To<bool>\((.+?)\)/g, '$1.As<Napi::Boolean>().Value()'],
  // ex. Nan::To<int>(info[0]) to info[0].As<Napi::Number>().Int32Value()
  [/Nan::To<int>\((.+?)\)/g, '$1.As<Napi::Number>().Int32Value()'],
  // ex. Nan::To<int32_t>(info[0]) to info[0].As<Napi::Number>().Int32Value()
  [/Nan::To<int32_t>\((.+?)\)/g, '$1.As<Napi::Number>().Int32Value()'],
  // ex. Nan::To<uint32_t>(info[0]) to info[0].As<Napi::Number>().Uint32Value()
  [/Nan::To<uint32_t>\((.+?)\)/g, '$1.As<Napi::Number>().Uint32Value()'],
  // ex. Nan::To<int64_t>(info[0]) to info[0].As<Napi::Number>().Int64Value()
  [/Nan::To<int64_t>\((.+?)\)/g, '$1.As<Napi::Number>().Int64Value()'],
  // ex. Nan::To<float>(info[0]) to info[0].As<Napi::Number>().FloatValue()
  [/Nan::To<float>\((.+?)\)/g, '$1.As<Napi::Number>().FloatValue()'],
  // ex. Nan::To<double>(info[0]) to info[0].As<Napi::Number>().DoubleValue()
  [/Nan::To<double>\((.+?)\)/g, '$1.As<Napi::Number>().DoubleValue()'],

  [/Nan::New\((\w+)\)->HasInstance\((\w+)\)/g, '$2.InstanceOf($1.Value())'],

  [/Nan::Has\(([^,]+),\s*/gm, '($1).Has('],
  [/\.Has\([\s|\\]*Nan::New<(v8::)*String>\(([^)]+)\)\)/gm, '.Has($1)'],
  [/\.Has\([\s|\\]*Nan::New\(([^)]+)\)\)/gm, '.Has($1)'],

  [/Nan::Get\(([^,]+),\s*/gm, '($1).Get('],
  [/\.Get\([\s|\\]*Nan::New<(v8::)*String>\(([^)]+)\)\)/gm, '.Get($1)'],
  [/\.Get\([\s|\\]*Nan::New\(([^)]+)\)\)/gm, '.Get($1)'],

  [/Nan::Set\(([^,]+),\s*/gm, '($1).Set('],
  [/\.Set\([\s|\\]*Nan::New<(v8::)*String>\(([^)]+)\)\s*,/gm, '.Set($1,'],
  [/\.Set\([\s|\\]*Nan::New\(([^)]+)\)\s*,/gm, '.Set($1,'],

  // ex. node::Buffer::HasInstance(info[0]) to info[0].IsBuffer()
  [/node::Buffer::HasInstance\((.+?)\)/g, '$1.IsBuffer()'],
  // ex. node::Buffer::Length(info[0]) to info[0].Length()
  [/node::Buffer::Length\((.+?)\)/g, '$1.As<Napi::Buffer<char>>().Length()'],
  // ex. node::Buffer::Data(info[0]) to info[0].Data()
  [/node::Buffer::Data\((.+?)\)/g, '$1.As<Napi::Buffer<char>>().Data()'],
  [/Nan::CopyBuffer\(/g, 'Napi::Buffer::Copy(env, '],

  // Nan::AsyncQueueWorker(worker)
  [/Nan::AsyncQueueWorker\((.+)\);/g, '$1.Queue();'],
  [/Nan::(Undefined|Null|True|False)\(\)/g, 'env.$1()'],

  // Nan::ThrowError(error) to Napi::Error::New(env, error).ThrowAsJavaScriptException()
  [/([ ]*)return Nan::Throw(\w*?)Error\((.+?)\);/g, '$1Napi::$2Error::New(env, $3).ThrowAsJavaScriptException();\n$1return env.Null();'],
  [/Nan::Throw(\w*?)Error\((.+?)\);\n(\s*)return;/g, 'Napi::$1Error::New(env, $2).ThrowAsJavaScriptException();\n$3return env.Null();'],
  [/Nan::Throw(\w*?)Error\((.+?)\);/g, 'Napi::$1Error::New(env, $2).ThrowAsJavaScriptException();\n'],
  // Nan::RangeError(error) to Napi::RangeError::New(env, error)
  [/Nan::(\w*?)Error\((.+)\)/g, 'Napi::$1Error::New(env, $2)'],

  [/Nan::Set\((.+?),\n* *(.+?),\n* *(.+?),\n* *(.+?)\)/g, '$1.Set($2, $3, $4)'],

  [/Nan::(Escapable)?HandleScope\s+(\w+)\s*;/g, 'Napi::$1HandleScope $2(env);'],
  [/Nan::(Escapable)?HandleScope/g, 'Napi::$1HandleScope'],
  [/Nan::ForceSet\(([^,]+), ?/g, '$1->DefineProperty('],
  [/\.ForceSet\(Napi::String::New\(env, "(\w+)"\),\s*?/g, '.DefineProperty("$1", '],
  // [ /Nan::GetPropertyNames\(([^,]+)\)/, '$1->GetPropertyNames()' ],
  [/Nan::Equals\(([^,]+),/g, '$1.StrictEquals('],

  [/(.+)->Set\(/g, '$1.Set('],

  [/Nan::Callback/g, 'Napi::FunctionReference'],

  [/Nan::Persistent<Object>/g, 'Napi::ObjectReference'],
  [/Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target/g, 'Napi::Env& env, Napi::Object& target'],

  [/(\w+)\*\s+(\w+)\s*=\s*Nan::ObjectWrap::Unwrap<\w+>\(info\.This\(\)\);/g, '$1* $2 = this;'],
  [/Nan::ObjectWrap::Unwrap<(\w+)>\((.*)\);/g, '$2.Unwrap<$1>();'],

  [/Nan::NAN_METHOD_RETURN_TYPE/g, 'void'],
  [/NAN_INLINE/g, 'inline'],

  [/Nan::NAN_METHOD_ARGS_TYPE/g, 'const Napi::CallbackInfo&'],
  [/NAN_METHOD\(([\w\d:]+?)\)/g, 'Napi::Value $1(const Napi::CallbackInfo& info)'],
  [/static\s*NAN_GETTER\(([\w\d:]+?)\)/g, 'Napi::Value $1(const Napi::CallbackInfo& info)'],
  [/NAN_GETTER\(([\w\d:]+?)\)/g, 'Napi::Value $1(const Napi::CallbackInfo& info)'],
  [/static\s*NAN_SETTER\(([\w\d:]+?)\)/g, 'void $1(const Napi::CallbackInfo& info, const Napi::Value& value)'],
  [/NAN_SETTER\(([\w\d:]+?)\)/g, 'void $1(const Napi::CallbackInfo& info, const Napi::Value& value)'],
  [/void Init\((v8::)*Local<(v8::)*Object> exports\)/g, 'Napi::Object Init(Napi::Env env, Napi::Object exports)'],
  [/NAN_MODULE_INIT\(([\w\d:]+?)\);/g, 'Napi::Object $1(Napi::Env env, Napi::Object exports);'],
  [/NAN_MODULE_INIT\(([\w\d:]+?)\)/g, 'Napi::Object $1(Napi::Env env, Napi::Object exports)'],

  [/::(Init(?:ialize)?)\(target\)/g, '::$1(env, target, module)'],
  [/constructor_template/g, 'constructor'],

  [/Nan::FunctionCallbackInfo<(v8::)?Value>[ ]*& [ ]*info\)[ ]*{\n*([ ]*)/gm, 'Napi::CallbackInfo& info) {\n$2Napi::Env env = info.Env();\n$2'],
  [/Nan::FunctionCallbackInfo<(v8::)*Value>\s*&\s*info\);/g, 'Napi::CallbackInfo& info);'],
  [/Nan::FunctionCallbackInfo<(v8::)*Value>\s*&/g, 'Napi::CallbackInfo&'],

  [/Buffer::HasInstance\(([^)]+)\)/g, '$1.IsBuffer()'],

  [/info\[(\d+)\]->/g, 'info[$1].'],
  [/info\[([\w\d]+)\]->/g, 'info[$1].'],
  [/info\.This\(\)->/g, 'info.This().'],
  [/->Is(Object|String|Int32|Number)\(\)/g, '.Is$1()'],
  [/info.GetReturnValue\(\).SetUndefined\(\)/g, 'return env.Undefined()'],
  [/info\.GetReturnValue\(\)\.Set\(((\n|.)+?)\);/g, 'return $1;'],

  // ex. Local<Value> to Napi::Value
  [/v8::Local<v8::(Value|Boolean|String|Number|Object|Array|Symbol|External|Function)>/g, 'Napi::$1'],
  [/Local<(Value|Boolean|String|Number|Object|Array|Symbol|External|Function)>/g, 'Napi::$1'],

  // Declare an env in helper functions that take a Napi::Value
  [/(\w+)\(Napi::Value (\w+)(,\s*[^()]+)?\)\s*{\n*([ ]*)/gm, '$1(Napi::Value $2$3) {\n$4Napi::Env env = $2.Env();\n$4'],

  // delete #include <node.h> and/or <v8.h>
  [/#include +(<|")(?:node|nan).h("|>)/g, '#include $1napi.h$2\n#include $1uv.h$2'],
  // NODE_MODULE to NODE_API_MODULE
  [/NODE_MODULE/g, 'NODE_API_MODULE'],
  [/Nan::/g, 'Napi::'],
  [/nan.h/g, 'napi.h'],

  // delete .FromJust()
  [/\.FromJust\(\)/g, ''],
  // delete .ToLocalCheck()
  [/\.ToLocalChecked\(\)/g, ''],
  [/^.*->SetInternalFieldCount\(.*$/gm, ''],

  // replace using node; and/or using v8; to using Napi;
  [/using (node|v8);/g, 'using Napi;'],
  [/using namespace (node|Nan|v8);/g, 'using namespace Napi;'],
  // delete using v8::Local;
  [/using v8::Local;\n/g, ''],
  // replace using v8::XXX; with using Napi::XXX
  [/using v8::([A-Za-z]+);/g, 'using Napi::$1;']

];

const paths = listFiles(dir);
paths.forEach(function (dirEntry) {
  const filename = dirEntry.split('\\').pop().split('/').pop();

  // Check whether the file is a source file or a config file
  // then execute function accordingly
  const sourcePattern = /.+\.h|.+\.cc|.+\.cpp/;
  if (sourcePattern.test(filename)) {
    convertFile(dirEntry, SourceFileOperations);
  } else if (ConfigFileOperations[filename] != null) {
    convertFile(dirEntry, ConfigFileOperations[filename]);
  }
});

function listFiles (dir, filelist) {
  const files = fs.readdirSync(dir);
  filelist = filelist || [];
  files.forEach(function (file) {
    if (file === 'node_modules') {
      return;
    }

    if (fs.statSync(path.join(dir, file)).isDirectory()) {
      filelist = listFiles(path.join(dir, file), filelist);
    } else {
      filelist.push(path.join(dir, file));
    }
  });
  return filelist;
}

function convert (content, operations) {
  for (let i = 0; i < operations.length; i++) {
    const operation = operations[i];
    content = content.replace(operation[0], operation[1]);
  }
  return content;
}

function convertFile (fileName, operations) {
  fs.readFile(fileName, 'utf-8', function (err, file) {
    if (err) throw err;

    file = convert(file, operations);

    fs.writeFile(fileName, file, function (err) {
      if (err) throw err;
    });
  });
}