Add bin and edit workflow

bin/gems/liquid-4.0.4/lib/liquid/template.rb

@@ -0,0 +1,252 @@
+module Liquid
+  # Templates are central to liquid.
+  # Interpretating templates is a two step process. First you compile the
+  # source code you got. During compile time some extensive error checking is performed.
+  # your code should expect to get some SyntaxErrors.
+  #
+  # After you have a compiled template you can then <tt>render</tt> it.
+  # You can use a compiled template over and over again and keep it cached.
+  #
+  # Example:
+  #
+  #   template = Liquid::Template.parse(source)
+  #   template.render('user_name' => 'bob')
+  #
+  class Template
+    attr_accessor :root
+    attr_reader :resource_limits, :warnings
+
+    @@file_system = BlankFileSystem.new
+
+    class TagRegistry
+      include Enumerable
+
+      def initialize
+        @tags = {}
+        @cache = {}
+      end
+
+      def [](tag_name)
+        return nil unless @tags.key?(tag_name)
+        return @cache[tag_name] if Liquid.cache_classes
+
+        lookup_class(@tags[tag_name]).tap { |o| @cache[tag_name] = o }
+      end
+
+      def []=(tag_name, klass)
+        @tags[tag_name]  = klass.name
+        @cache[tag_name] = klass
+      end
+
+      def delete(tag_name)
+        @tags.delete(tag_name)
+        @cache.delete(tag_name)
+      end
+
+      def each(&block)
+        @tags.each(&block)
+      end
+
+      private
+
+      def lookup_class(name)
+        name.split("::").reject(&:empty?).reduce(Object) { |scope, const| scope.const_get(const) }
+      end
+    end
+
+    attr_reader :profiler
+
+    class << self
+      # Sets how strict the parser should be.
+      # :lax acts like liquid 2.5 and silently ignores malformed tags in most cases.
+      # :warn is the default and will give deprecation warnings when invalid syntax is used.
+      # :strict will enforce correct syntax.
+      attr_writer :error_mode
+
+      # Deprecated. No longer used. Removed in version 5
+      attr_writer :taint_mode
+
+      attr_accessor :default_exception_renderer
+      Template.default_exception_renderer = lambda do |exception|
+        exception
+      end
+
+      def file_system
+        @@file_system
+      end
+
+      def file_system=(obj)
+        @@file_system = obj
+      end
+
+      def register_tag(name, klass)
+        tags[name.to_s] = klass
+      end
+
+      def tags
+        @tags ||= TagRegistry.new
+      end
+
+      def error_mode
+        @error_mode ||= :lax
+      end
+
+      # Deprecated. Removed in version 5
+      def taint_mode
+        @taint_mode ||= :lax
+      end
+
+      # Pass a module with filter methods which should be available
+      # to all liquid views. Good for registering the standard library
+      def register_filter(mod)
+        Strainer.global_filter(mod)
+      end
+
+      def default_resource_limits
+        @default_resource_limits ||= {}
+      end
+
+      # creates a new <tt>Template</tt> object from liquid source code
+      # To enable profiling, pass in <tt>profile: true</tt> as an option.
+      # See Liquid::Profiler for more information
+      def parse(source, options = {})
+        template = Template.new
+        template.parse(source, options)
+      end
+    end
+
+    def initialize
+      @rethrow_errors = false
+      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
+    end
+
+    # Parse source code.
+    # Returns self for easy chaining
+    def parse(source, options = {})
+      @options = options
+      @profiling = options[:profile]
+      @line_numbers = options[:line_numbers] || @profiling
+      parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options)
+      @root = Document.parse(tokenize(source), parse_context)
+      @warnings = parse_context.warnings
+      self
+    end
+
+    def registers
+      @registers ||= {}
+    end
+
+    def assigns
+      @assigns ||= {}
+    end
+
+    def instance_assigns
+      @instance_assigns ||= {}
+    end
+
+    def errors
+      @errors ||= []
+    end
+
+    # Render takes a hash with local variables.
+    #
+    # if you use the same filters over and over again consider registering them globally
+    # with <tt>Template.register_filter</tt>
+    #
+    # if profiling was enabled in <tt>Template#parse</tt> then the resulting profiling information
+    # will be available via <tt>Template#profiler</tt>
+    #
+    # Following options can be passed:
+    #
+    #  * <tt>filters</tt> : array with local filters
+    #  * <tt>registers</tt> : hash with register variables. Those can be accessed from
+    #    filters and tags and might be useful to integrate liquid more with its host application
+    #
+    def render(*args)
+      return ''.freeze if @root.nil?
+
+      context = case args.first
+      when Liquid::Context
+        c = args.shift
+
+        if @rethrow_errors
+          c.exception_renderer = ->(e) { raise }
+        end
+
+        c
+      when Liquid::Drop
+        drop = args.shift
+        drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
+      when Hash
+        Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits)
+      when nil
+        Context.new(assigns, instance_assigns, registers, @rethrow_errors, @resource_limits)
+      else
+        raise ArgumentError, "Expected Hash or Liquid::Context as parameter"
+      end
+
+      case args.last
+      when Hash
+        options = args.pop
+
+        registers.merge!(options[:registers]) if options[:registers].is_a?(Hash)
+
+        apply_options_to_context(context, options)
+      when Module, Array
+        context.add_filters(args.pop)
+      end
+
+      # Retrying a render resets resource usage
+      context.resource_limits.reset
+
+      begin
+        # render the nodelist.
+        # for performance reasons we get an array back here. join will make a string out of it.
+        result = with_profiling(context) do
+          @root.render(context)
+        end
+        result.respond_to?(:join) ? result.join : result
+      rescue Liquid::MemoryError => e
+        context.handle_error(e)
+      ensure
+        @errors = context.errors
+      end
+    end
+
+    def render!(*args)
+      @rethrow_errors = true
+      render(*args)
+    end
+
+    private
+
+    def tokenize(source)
+      Tokenizer.new(source, @line_numbers)
+    end
+
+    def with_profiling(context)
+      if @profiling && !context.partial
+        raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler)
+
+        @profiler = Profiler.new
+        @profiler.start
+
+        begin
+          yield
+        ensure
+          @profiler.stop
+        end
+      else
+        yield
+      end
+    end
+
+    def apply_options_to_context(context, options)
+      context.add_filters(options[:filters]) if options[:filters]
+      context.global_filter = options[:global_filter] if options[:global_filter]
+      context.exception_renderer = options[:exception_renderer] if options[:exception_renderer]
+      context.strict_variables = options[:strict_variables] if options[:strict_variables]
+      context.strict_filters = options[:strict_filters] if options[:strict_filters]
+    end
+  end
+end