#!/usr/bin/env bash
# doodad-js - Object-oriented programming framework
# File: make.bsh - libxml2 build script for JS.
# Project home: https://github.com/doodadjs/
# Author: Claude Petit, Quebec city
# Contact: doodadjs [at] gmail.com
# Note: I'm still in alpha-beta stage, so expect to find some bugs or incomplete parts !
# License: Apache V2
#
#	Copyright 2015-2018 Claude Petit
#
#	Licensed under the Apache License, Version 2.0 (the "License");
#	you may not use this file except in compliance with the License.
#	You may obtain a copy of the License at
#
#		http://www.apache.org/licenses/LICENSE-2.0
#
#	Unless required by applicable law or agreed to in writing, software
#	distributed under the License is distributed on an "AS IS" BASIS,
#	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#	See the License for the specific language governing permissions and
#	limitations under the License.

# Set Bash env
set -e
set -o pipefail

# Install pre-required system packages
sudo apt-get update
sudo apt-get install python2.7 build-essential default-jre cmake autoconf automake libtool

# Download Portable Emscripten SDK
wget https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz emsdk-portable.tar.gz
tar -xzf emsdk-portable.tar.gz emsdk

# Enter "emsdk"
cd emsdk

# Install and build latest stable SDK (will take some hours and about 30 gigs of free disk space)
./emsdk update
./emsdk install latest
./emsdk install sdk-1.38.4-64bit

# Activate latest stable SDK
./emsdk activate latest
./emsdk activate sdk-1.38.4-64bit

# Set SDK environment
source ./emsdk_env.sh

# Exit "emsdk"
cd ..

# Extract the source code of the 'libxml2' C-library.
tar -xzf libxml2-2.9.8.tar.gz libxml2

# Apply patches
patch -b libxml2/xmlschemas.c xmlschemas.patch

# Inject "xmljs.c" to source code
cp xmljs.c libxml2/

# Enter "libxml2"
cd libxml2

# Disable "stat" because we transpile with "NO_FILESYSTEM".
sed -i.bak "/AC_CHECK_FUNCS.*stat .*)/d" configure.ac

# Disable some features
emconfigure ./autogen.sh --with-http=no --with-ftp=no --with-python=no --with-threads=no --with-xptr=no --with-regexps=no --with-legacy=no --with-c14n=no --with-catalog=no --with-docbook=no --with-schematron=no --with-iso8859x=no --with-html=no --with-debug=no --without-iconv --without-zlib --without-lzma --without-readline --without-python

# Build
emmake make

# Transpile to JS
#emcc -O3 --closure 2 --memory-init-file 0 -s WASM=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s STRICT=1 -s NODEJS_CATCH_EXIT=0 -s NO_FILESYSTEM=1 -s LINKABLE=1 -s EXPORT_NAME="'libxml2'" -s EXPORTED_RUNTIME_METHODS="['addFunction','ALLOC_NORMAL','allocate','intArrayFromString','intArrayToString','Pointer_stringify','removeFunction','UTF8ToString','stringToUTF8','lengthBytesUTF8','getValue','setValue']" -s EXPORTED_FUNCTIONS="['_xmlInitParser','_xmlCleanupInputCallbacks','_xmlCleanupOutputCallbacks','_xmlRegisterInputCallbacks','_xmlRegisterOutputCallbacks','_xmlSchemaNewParserCtxt','_xmlSchemaNewParserCtxt','_xmlSchemaSetParserErrors','_xmlSchemaParse','_xmlSchemaIsValid','_xmlSchemaNewValidCtxt','_xmlSchemaSetValidErrors','_xmlSchemaValidateDoc','_xmlSchemaFreeValidCtxt','_xmlSchemaFree','_xmlSchemaFreeParserCtxt','_xmlFreeDoc','_xmlCreatePushParserCtxt','_xmlParseChunk','_xmlFreeParserCtxt','_xmlCleanupParser','_xmlSchemaSAXPlug','_xmlSchemaSAXUnplug','_xmlSetExternalEntityLoader','_xmlNewEntity','_xmlFreeEntity','_xmlFreeEx','_xmlPtrLen','_xmlCreateMySAXHandler','_xmlFreeMySAXHandler','_xmlCreateMyParserInput','_xmlGetUserDataFromParserCtxt','_xmlFormatGenericError']" -s RESERVED_FUNCTION_POINTERS=100 -I include .libs/libxml2.so xmljs.c -o ../libxml2-slim.js
emcc -O2 --closure 0 --memory-init-file 0 -s WASM=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s STRICT=1 -s NODEJS_CATCH_EXIT=0 -s NO_FILESYSTEM=1 -s LINKABLE=1 -s EXPORT_NAME="'libxml2'" -s EXPORTED_RUNTIME_METHODS="['addFunction','ALLOC_NORMAL','allocate','intArrayFromString','intArrayToString','Pointer_stringify','removeFunction','UTF8ToString','stringToUTF8','lengthBytesUTF8','getValue','setValue']" -s EXPORTED_FUNCTIONS="['_xmlInitParser','_xmlCleanupInputCallbacks','_xmlCleanupOutputCallbacks','_xmlRegisterInputCallbacks','_xmlRegisterOutputCallbacks','_xmlSchemaNewParserCtxt','_xmlSchemaNewParserCtxt','_xmlSchemaSetParserErrors','_xmlSchemaParse','_xmlSchemaIsValid','_xmlSchemaNewValidCtxt','_xmlSchemaSetValidErrors','_xmlSchemaValidateDoc','_xmlSchemaFreeValidCtxt','_xmlSchemaFree','_xmlSchemaFreeParserCtxt','_xmlFreeDoc','_xmlCreatePushParserCtxt','_xmlParseChunk','_xmlFreeParserCtxt','_xmlCleanupParser','_xmlSchemaSAXPlug','_xmlSchemaSAXUnplug','_xmlSetExternalEntityLoader','_xmlNewEntity','_xmlFreeEntity','_xmlFreeEx','_xmlPtrLen','_xmlCreateMySAXHandler','_xmlFreeMySAXHandler','_xmlCreateMyParserInput','_xmlGetUserDataFromParserCtxt','_xmlFormatGenericError']" -s RESERVED_FUNCTION_POINTERS=100 -I include .libs/libxml2.so xmljs.c -o ../libxml2.min.js
emcc -O1 --closure 0 --memory-init-file 0 -s WASM=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s STRICT=1 -s NODEJS_CATCH_EXIT=0 -s NO_FILESYSTEM=1 -s LINKABLE=1 -s EXPORT_NAME="'libxml2'" -s EXPORTED_RUNTIME_METHODS="['addFunction','ALLOC_NORMAL','allocate','intArrayFromString','intArrayToString','Pointer_stringify','removeFunction','UTF8ToString','stringToUTF8','lengthBytesUTF8','getValue','setValue']" -s EXPORTED_FUNCTIONS="['_xmlInitParser','_xmlCleanupInputCallbacks','_xmlCleanupOutputCallbacks','_xmlRegisterInputCallbacks','_xmlRegisterOutputCallbacks','_xmlSchemaNewParserCtxt','_xmlSchemaNewParserCtxt','_xmlSchemaSetParserErrors','_xmlSchemaParse','_xmlSchemaIsValid','_xmlSchemaNewValidCtxt','_xmlSchemaSetValidErrors','_xmlSchemaValidateDoc','_xmlSchemaFreeValidCtxt','_xmlSchemaFree','_xmlSchemaFreeParserCtxt','_xmlFreeDoc','_xmlCreatePushParserCtxt','_xmlParseChunk','_xmlFreeParserCtxt','_xmlCleanupParser','_xmlSchemaSAXPlug','_xmlSchemaSAXUnplug','_xmlSetExternalEntityLoader','_xmlNewEntity','_xmlFreeEntity','_xmlFreeEx','_xmlPtrLen','_xmlCreateMySAXHandler','_xmlFreeMySAXHandler','_xmlCreateMyParserInput','_xmlGetUserDataFromParserCtxt','_xmlFormatGenericError']" -s RESERVED_FUNCTION_POINTERS=100 -s ASSERTIONS=2 -I include .libs/libxml2.so xmljs.c -o ../libxml2.js

# Exit "libxml2"
cd ..