Class: Condenser::DartSassTransformer

Inherits:
NodeProcessor show all
Defined in:
lib/condenser/transformers/dart_sass_transformer.rb

Direct Known Subclasses

DartScssTransformer

Constant Summary collapse

ACCEPT = 
['text/css', 'text/scss', 'text/sass']
@@helper_methods = 
Set.new

Instance Attribute Summary collapse

Attributes inherited from NodeProcessor

#npm_path

Class Method Summary collapse

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, options = {}) ⇒ DartSassTransformer

Returns a new instance of DartSassTransformer.



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 26

def initialize(dir, options = {})
  super(dir)
  npm_install('sass')
  
  @options = options.merge({
    indentedSyntax: self.class.syntax == :sass
  }).freeze
end

Instance Attribute Details

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 7

def options
  @options
end

Class Method Details

.add_helper_methods(module_to_add = nil, &block) ⇒ Object

Use this function to append Modules that contain functions to expose to dart-sass



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 11

def self.add_helper_methods(module_to_add = nil, &block)
  old_methods = self.instance_methods
  
  self.include(module_to_add) if module_to_add
  self.class_eval(&block) if block_given?
  
  @@helper_methods.merge(self.instance_methods - old_methods)
end

.syntax ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 22

def self.syntax
  :sass
end

Instance Method Details

#call(environment, input) ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 57

def call(environment, input)
  @context = environment.new_context_class#.new(environment)
  
  options = {
    verbose: true,
    file: File.join('/', input[:filename])
  }.merge(@options)
  @environment = environment
  @input = input

  result = exec_runtime(<<-JS)
    const fs    = require('fs');
    const sass = require("#{npm_module_path('sass')}");
    const stdin = process.stdin;
    stdin.resume();
    stdin.setEncoding('utf8');
    
    // SET STDOUT to sync so that we don't get in an infinte looping waiting
    // for Ruby to response when we haven't even sent the entire request.
    if (process.stdout._handle) process.stdout._handle.setBlocking(true)
      
    const source = #{JSON.generate(input[:source])};
    const options = #{JSON.generate(options)};

    var rid = 0;
    function request(method, ...args) {
      var trid = rid;
      rid += 1;
      console.log(JSON.stringify({ rid: trid, method: method, args: args }) + "\\n");
      

      var readBuffer = '';
      var response = null;
      let chunk = new Buffer(1024);
      let bytesRead;
      
      while (response === null) {
        try {
          bytesRead = fs.readSync(stdin.fd, chunk, 0, 1024);
          if (bytesRead === null) { exit(1); }
          readBuffer += chunk.toString('utf8', 0, bytesRead);
          [readBuffer, response] = readResponse(readBuffer);
        } catch (e) {
           if (e.code !== 'EAGAIN') { throw e; }
        }
      }
      return response['return'];
    }
    
    function readResponse(buffer) {
      try {
        var message = JSON.parse(buffer);
        return ['', message];
      } catch(e) {
        if (e.name === "SyntaxError") {
          if (e.message.startsWith('Unexpected non-whitespace character after JSON at position ')) {
            let pos = parseInt(e.message.slice(59));
            let [b, r] = readResponse(buffer.slice(0,pos));
            return [b + buffer.slice(pos), r];
          } 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));
            let [b, r] = readResponse(buffer.slice(0,pos));
            return [b + buffer.slice(pos), r];
          } else {
            return [buffer, null];
          }
        } else {
          console.log(JSON.stringify({method: 'error', args: [e.name, e.message]}) + "\\n");
          process.exit(1);
        }
      }
    }
    
    
    options.importer = function(url, prev) { return request('load', url, prev); };
    
    const call_fn = function(name, types, args) {
      const transformedArgs = [];
      request('log', '==================')
      args.forEach((a, i) => {
        if (types[i] === 'Map') {
          // Don't know how to go from SassMap to hash yet
          transformedArgs.push({});
        } else if (types[i] === 'List') {
          // Don't know how to go from SassList to hash yet
          transformedArgs.push([]);
        } else if (!(a instanceof sass.types[types[i]])) {
          throw "$url: Expected a string."; 
        } else {
          transformedArgs.push(a.getValue());
        }
         

        // if (types[i] === 'List') { a = a.contents(); }
      });
      request('log', name, transformedArgs, types)
      return new sass.types.String(request('call', name, transformedArgs));
    }
    options.functions = {};
    #{JSON.generate(helper_method_signatures)}.forEach( (f) => {
      let name = f[0].replace(/-/g, '_').replace(/(^[^\\(]+)\\(.*\\)$/, '$1');
      options.functions[f[0]] = (...a) => call_fn(name, f[1], a);
    })
    
    try {
      options.data = source;
      const result = sass.renderSync(options);
      request('result', result.css.toString());
      process.exit(0);
    } catch(e) {
      request('error', e.name, e.message);
      process.exit(1);
    }
  JS
  
  input[:source] = result
  # input[:map] = map.to_json({})
  input[:linked_assets]         += @context.links
  input[:process_dependencies]  += @context.dependencies
end

#exec_runtime(script) ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 197

def exec_runtime(script)
  io = IO.popen([binary, '-e', script], 'r+')
  buffer = ''
  result = nil
  
  begin
    while IO.select([io]) && io_read = io.read_nonblock(1_024)
      buffer << io_read
      messages = buffer.split("\n\n")
      buffer = buffer.end_with?("\n\n") ? '' : messages.pop
      
      messages.each do |message|
        message = JSON.parse(message)

        ret = case message['method']
        when 'result'
          result = message['args'][0]
          nil
        when 'load'
          importee = message['args'][0]
          importer = message['args'][1]
          
          if importee.end_with?('*')
            @context.depend_on(importee)
            code = ""
            resolve(importee, importer).each do |f, i|
              code << "@import '#{f.filename}';\n"
            end
            { contents: code, map: nil }
          else
            if asset = find(importee)
              @context.depend_on(asset.filename)
              { contents: asset.source, map: asset.sourcemap }
            else
              @context.depend_on(importee)
              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 'call'
          if respond_to?(message['args'][0])
            send(message['args'][0], *message['args'][1])
          else
            puts '!!!'
          end
        end

        io.write(JSON.generate({rid: message['rid'], return: ret}))
      end
    end
  rescue Errno::EPIPE, EOFError
  end
  
  io.close
  if $?.success?
    result
  else
    raise exec_runtime_error(buffer)
  end
end

#expand_path(path, base = nil) ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 189

def expand_path(path, base=nil)
  if path.start_with?('.')
    File.expand_path(path, File.dirname(base)).delete_prefix(File.expand_path('.') + '/')
  else
    File.expand_path(path).delete_prefix(File.expand_path('.') + '/')
  end
end

#find(importee, importer = nil) ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 179

def find(importee, importer = nil)
  # importer ||= @input[:source_file]
  @environment.find(expand_path(importee, importer), nil, accept: ACCEPT)
end

#helper_method_signatures ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 35

def helper_method_signatures
  x = @@helper_methods.map do |name|
    arity = self.method(name).arity
    signature = []
    types = []
    if respond_to?(:"#{name}_signature")
      send(:"#{name}_signature").each do |arg, type|
        signature << arg
        types << type
      end
    elsif arity >= 0
      arity.times.with_index do |a|
        signature << "$arg#{a}"
        types << 'String'
      end
    end
    
    ["#{name}(#{signature.join(', ')})", types]
  end
  x
end

#resolve(importee, importer = nil) ⇒ Object 



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# File 'lib/condenser/transformers/dart_sass_transformer.rb', line 184

def resolve(importee, importer = nil)
  # importer ||= @input[:source_file]
  @environment.resolve(expand_path(importee, importer), accept: ACCEPT)
end