Class: Condenser::RollupProcessor

Inherits:
NodeProcessor show all
Defined in:
lib/condenser/processors/rollup_processor.rb

Instance Attribute Summary collapse

Attributes inherited from NodeProcessor

#npm_path

Instance Method Summary collapse

Methods inherited from NodeProcessor

#binary, call, #exec_runtime_error, #exec_syntax_error, #name, #npm_install, #npm_module_path, setup

Constructor Details

#initialize(dir = nil, options = {}) ⇒ RollupProcessor

Returns a new instance of RollupProcessor.



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# File 'lib/condenser/processors/rollup_processor.rb', line 8

def initialize(dir = nil, options = {})
  super(dir)
  npm_install('rollup', '@rollup/plugin-commonjs', '@rollup/plugin-node-resolve')
  
  @options = options.freeze
end

Instance Attribute Details

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/condenser/processors/rollup_processor.rb', line 6

def options
  @options
end

Instance Method Details

#build_tree(renderStack, from, to, visited: nil) ⇒ Object 



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# File 'lib/condenser/processors/rollup_processor.rb', line 281

def build_tree(renderStack, from, to, visited: nil)
  visited ||= []
  return if visited.include?(from)
  visited << from
  
  if renderStack[from].nil? || renderStack[from].empty?
    nil
  elsif renderStack[from].include?(to)
    from
  else
    renderStack[from].each do |dep|
      if tree = build_tree(renderStack, dep, to, visited: visited)
        return "#{from}\n└ #{tree.lines.each_with_index.map{|l, i| "#{i == 0 ? '' : '    '}#{l}"}.join("")}"
      end
    end
    nil
  end
end

#call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/rollup_processor.rb', line 15

def call(environment, input)
  @environment = environment
  @input = input
  
  Dir.mktmpdir do |output_dir|
    @entry = File.join(output_dir, 'entry.js')
    input_options = {
      input: @entry
    }
    output_options = {
      file: File.join(output_dir, 'result.js'),
      format: 'iife',
      # output: { sourcemap: true, format: 'iife' },
      globals: [],
      sourcemap: true
    }
    if input[:source] =~ /export\s+{[^}]+};?\z/i
      output_options[:name] = File.basename(input[:filename], ".*").capitalize
      # output_options[:output][:name] = File.basename(input[:filename], ".*").capitalize
    end
    
    exec_runtime(<<-JS, @entry)
      const fs    = require('fs');
      const path  = require('path');
      const stdin = process.stdin;

      module.paths.push("#{File.join(npm_path, 'node_modules')}")

      var buffer = '';
      stdin.resume();
      stdin.setEncoding('utf8');
      function emitMessages(buffer) {
        try {
          var message = JSON.parse(buffer);
          stdin.emit('message' + message.rid, message);
          return '';
        } catch(e) {
          if (e.name === "SyntaxError") {
            if (e.message.startsWith('Unexpected non-whitespace character after JSON at position ')) {
              var pos = parseInt(e.message.slice(59));
              emitMessages(buffer.slice(0,pos));
              return emitMessages(buffer.slice(pos));
            } else if (e.message.startsWith('Unexpected token { in JSON at position ')) {
              // This can be removed, once dropping support for node <= v18
              var pos = parseInt(e.message.slice(39));
              emitMessages(buffer.slice(0,pos));
              return emitMessages(buffer.slice(pos));
            } else {
              return buffer;
            }
          } else {
            console.log(JSON.stringify({method: 'error', args: [e.name, e.message]}) + "\\n");
            process.exit(1);
          }
        }
      }

      stdin.on('data', function (chunk) {
        buffer += chunk;
        buffer = emitMessages(buffer);
      });
      
      const rollup = require("#{npm_module_path('rollup')}");
      const commonjs = require("#{npm_module_path('@rollup/plugin-commonjs')}");
      const nodeResolve = require("#{npm_module_path('@rollup/plugin-node-resolve')}").nodeResolve;
      var rid = 0;
      var renderStack = {};
      var nodeResolver = null;
      
      function request(method, args) {
        var trid = rid;
        rid += 1;
        var promise = new Promise(function(resolve, reject) {
          stdin.once('message' + trid, function(message) {
            resolve(message['return']);
          });
        });

        console.log(JSON.stringify({ rid: trid, method: method, args: args }) + "\\n");

        return promise;
      }

      if ('#{environment.npm_path}' !== '') {
        nodeResolver = nodeResolve({
          mainFields: ['module', 'main'],
          // modulesOnly: true,
          // preferBuiltins: false,
          moduleDirectories: [],
          modulePaths: ['#{npm_module_path}']
        });
      }

      const inputOptions = #{JSON.generate(input_options)};
      inputOptions.plugins = [];
      inputOptions.plugins.push({
        name: 'condenser',
        resolveId: function (importee, importer, options) {
          if (importee.startsWith('\\0') || (importer && importer.startsWith('\\0'))) {
            return null;
          }

          if (!(importer in renderStack)) {
            renderStack[importer] = [];
          }

          return request('resolve', [importee, importer]).then((value) => {
              if (!(value === null || value === undefined) && !renderStack[importer].includes(value)) {
                renderStack[importer].push(value);
              }
              return value;
          });
        },
        load: function(id) {
          if (id.startsWith('\\0')) {
            return null;
          }

          return request('load', [id]).then(function(value) {
            return value;
          });
        }
      });
      
      inputOptions.plugins.push(nodeResolver);
      inputOptions.plugins.push(commonjs());
      
      // inputOptions.plugins.push({
      //   name: 'nullHanlder',
      //   resolveId: function (importee, importer, options) {
      //     request('log', [importee, importer, options])
      //     // request('error', ["AssetNotFound", importee, importer, renderStack]).then(function(value) {
      //     //   process.exit(1);
      //     // });
      //   }
      // });

      const outputOptions = #{JSON.generate(output_options)};

      async function build() {
        try {
          // inputOptions.cache = await JSON.parse(request('get_cache', []));
          
          const bundle = await rollup.rollup(inputOptions);
          await bundle.write(outputOptions);
          // await request('set_cache', [JSON.stringify(bundle)]);
          process.exit(0);
        } catch(e) {
          await request('error', [e.name, e.message, e.stack]);
          process.exit(1);
        }
      }

      build();
    JS
    
    input[:source] = File.read(File.join(output_dir, 'result.js'))
    input[:source].delete_suffix!("//# sourceMappingURL=result.js.map\n")
    # asset.map = File.read(File.join(output_dir, 'result.js.map'))
  end
end

#exec_runtime(script, input) ⇒ Object 



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# File 'lib/condenser/processors/rollup_processor.rb', line 177

def exec_runtime(script, input)
  io = IO.popen([binary, '-e', script], 'r+')
  buffer = ''
  
  begin
    
    while IO.select([io]) && io_read = io.read_nonblock(1_024)
      buffer << io_read
      messages = buffer.split("\n\n")
      
      buffer = if buffer.end_with?("\n\n")
        ''
      else
        messages.pop
      end
      
      messages.each do |message|
        message = JSON.parse(message)
        
        ret = case message['method']
        when 'resolve'
          importee, importer = message['args']

          if importer.nil? && importee == @entry
            @entry
          elsif importee.start_with?('@babel/runtime') || importee.start_with?('core-js-pure') || importee.start_with?('regenerator-runtime')
            x = File.join(npm_module_path, importee.gsub(/^\.\//, File.dirname(importer) + '/')).sub('/node_modules/regenerator-runtime', '/node_modules/regenerator-runtime/runtime.js')
            x = "#{x}.js" if !x.end_with?('.js', '.mjs')
            File.file?(x) ? x : (x.delete_suffix('.js') + "/index.js")
          elsif npm_module_path && importee&.start_with?(npm_module_path)
            x = importee.end_with?('.js', '.mjs') ? importee : "#{importee}.js"
            x = (x.delete_suffix('.js') + "/index.js") if !File.file?(x)
            x
          elsif importee.start_with?('.') && importer.start_with?(npm_module_path)
            x = File.expand_path(importee, File.dirname(importer))
            x = "#{x}.js" if !x.end_with?('.js', '.mjs')
            File.file?(x) ? x : (x.delete_suffix('.js') + "/index.js")
          elsif importee.end_with?('*')
            File.join(File.dirname(importee), '*')
          else
            @environment.find(importee, importer ? (@entry == importer ? @input[:source_file] : importer) : nil, accept: @input[:content_types].last)&.source_file
          end
        when 'load'
          importee = message['args'].first
          if importee == @entry
            { code: @input[:source], map: @input[:map] }
          elsif importee.end_with?('*')
            importees = @environment.resolve(importee, importer ? File.dirname(@entry == importer ? @input[:source_file] : importer) : nil, accept: @input[:content_types].last)
            code = ""
            code_imports = [];
            importees.each_with_index.map do |f, i|
              if f.has_default_export?
                code << "import _#{i} from '#{f.source_file}';\n"
                code_imports << "_#{i}"
              elsif f.has_exports?
                code << "import * as _#{i} from '#{f.source_file}';\n"
                code_imports << "_#{i}"
              else
                code << "import '#{f.source_file}';\n"
              end
            end
            
            code += "export default [#{code_imports.join(', ')}];"

            { code: code, map: nil }
          else
            asset = @environment.find(importee, accept: @input[:content_types].last)
            if asset
              { code: asset.source, map: asset.sourcemap }
            else
              nil
            end
          end
        when 'error'
          io.write(JSON.generate({rid: message['rid'], return: nil}))
          
          case message['args'][0]
          when 'AssetNotFound'
            error_message = "Could not find import \"#{message['args'][1]}\" for \"#{message['args'][2]}\".\n\n"
            error_message << build_tree(message['args'][3], input, message['args'][2])
            raise exec_runtime_error(error_message)
          else
            raise exec_runtime_error(message['args'][0] + ': ' + message['args'][1])
          end
        # when 'set_cache'
        #   @environment.cache.set('rollup', message['args'][0])
        #   io.write(JSON.generate({rid: message['rid'], return: true}))
        # when 'get_cache'
        #   io.write(JSON.generate({rid: message['rid'], return: [(@environment.cache.get('rollup') || '{}')] }))
        end
        io.write(JSON.generate({rid: message['rid'], return: ret}))
      end
    end
  rescue Errno::EPIPE, EOFError
  end
  
  io.close
  if $?.success?
    true
  else
    raise exec_runtime_error(buffer)
  end
end