class Haml::AttributeCompiler
Public Class Methods
@param options [Haml::Options]
# File lib/haml/attribute_compiler.rb, line 32 def initialize(options) @is_html = [:html4, :html5].include?(options[:format]) @attr_wrapper = options[:attr_wrapper] @escape_attrs = options[:escape_attrs] @hyphenate_data_attrs = options[:hyphenate_data_attrs] end
Returns a script to render attributes on runtime.
@param attributes [Hash] @param object_ref [String,:nil] @param dynamic_attributes [DynamicAttributes] @return [String] Attributes rendering code
# File lib/haml/attribute_compiler.rb, line 27 def self.runtime_build(attributes, object_ref, dynamic_attributes) "_hamlout.attributes(#{Haml::Util.inspect_obj(attributes)}, #{object_ref},#{dynamic_attributes.to_literal})" end
Public Instance Methods
Returns Temple expression to render attributes.
@param attributes [Hash] @param object_ref [String,:nil] @param dynamic_attributes [DynamicAttributes] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 45 def compile(attributes, object_ref, dynamic_attributes) if object_ref != :nil || !AttributeParser.available? return [:dynamic, AttributeCompiler.runtime_build(attributes, object_ref, dynamic_attributes)] end parsed_hashes = [dynamic_attributes.new, dynamic_attributes.old].compact.map do |attribute_hash| unless (hash = AttributeParser.parse(attribute_hash)) return [:dynamic, AttributeCompiler.runtime_build(attributes, object_ref, dynamic_attributes)] end hash end attribute_values = build_attribute_values(attributes, parsed_hashes) AttributeBuilder.verify_attribute_names!(attribute_values.map(&:key)) [:multi, *group_values_for_sort(attribute_values).map { |value_group| compile_attribute_values(value_group) }] end
Private Instance Methods
Returns array of AttributeValue
instances from static attributes and dynamic_attributes. For each key, the values' order in returned value is preserved in the same order as Haml::Buffer#attributes
's merge order.
@param attributes [{ String => String }] @param parsed_hashes [{ String => String }] @return [Array<AttributeValue>]
# File lib/haml/attribute_compiler.rb, line 87 def build_attribute_values(attributes, parsed_hashes) [].tap do |attribute_values| attributes.each do |key, static_value| attribute_values << AttributeValue.new(:static, key, static_value) end parsed_hashes.each do |parsed_hash| parsed_hash.each do |key, dynamic_value| attribute_values << AttributeValue.new(:dynamic, key, dynamic_value) end end end end
Compiles attribute values for one key to Temple expression that generates ` key='value'`.
@param key [String] @param values [Array<AttributeValue>] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 158 def compile_attribute(key, values) if values.all? { |v| Temple::StaticAnalyzer.static?(v.to_literal) } return static_build(values) end case key when 'id', 'class' compile_id_or_class_attribute(key, values) else compile_common_attribute(key, values) end end
Compiles attribute values with the similar key to Temple expression.
@param values [Array<AttributeValue>] whose `key`s are partially or fully the same from left. @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 104 def compile_attribute_values(values) if values.map(&:key).uniq.size == 1 compile_attribute(values.first.key, values) else runtime_build(values) end end
@param key [String] Not “id” or “class” @param values [Array<AttributeValue>] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 193 def compile_common_attribute(key, values) var = unique_name [:multi, [:code, "#{var} = (#{merged_value(key, values)})"], [:case, var, ['Hash', runtime_build([AttributeValue.new(:dynamic, key, var)])], ['true', true_value(key)], ['false, nil', [:multi]], [:else, [:multi, [:static, " #{key}=#{@attr_wrapper}"], [:escape, @escape_attrs, [:dynamic, var]], [:static, @attr_wrapper]], ] ], ] end
@param id_or_class [String] “id” or “class” @param values [Array<AttributeValue>] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 174 def compile_id_or_class_attribute(id_or_class, values) var = unique_name [:multi, [:code, "#{var} = (#{merged_value(id_or_class, values)})"], [:case, var, ['Hash, Array', runtime_build([AttributeValue.new(:dynamic, id_or_class, var)])], ['false, nil', [:multi]], [:else, [:multi, [:static, " #{id_or_class}=#{@attr_wrapper}"], [:escape, @escape_attrs, [:dynamic, var]], [:static, @attr_wrapper]], ] ], ] end
@param str [String] @return [String]
# File lib/haml/attribute_compiler.rb, line 149 def frozen_string(str) "#{Haml::Util.inspect_obj(str)}.freeze" end
Build array of grouped values whose sort order may go back and forth, which is also sorted with key name. This method needs to group values with the same start because it can be changed in `Haml::AttributeBuidler#build_data_keys`. @param values [Array<Haml::AttributeCompiler::AttributeValue>] @return [Array<Array<Haml::AttributeCompiler::AttributeValue>>]
# File lib/haml/attribute_compiler.rb, line 70 def group_values_for_sort(values) sorted_values = values.sort_by(&:key) [].tap do |value_groups| until sorted_values.empty? key = sorted_values.first.key value_group, sorted_values = sorted_values.partition { |v| v.key.start_with?(key) } value_groups << value_group end end end
@param key [String] @param values [Array<AttributeValue>] @return [String]
# File lib/haml/attribute_compiler.rb, line 139 def merged_value(key, values) if values.size == 1 values.first.to_literal else "::Haml::AttributeBuilder.merge_values(#{frozen_string(key)}, #{values.map(&:to_literal).join(', ')})" end end
@param values [Array<AttributeValue>] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 114 def runtime_build(values) hash_content = values.group_by(&:key).map do |key, values_for_key| "#{frozen_string(key)} => #{merged_value(key, values_for_key)}" end.join(', ') [:dynamic, "_hamlout.attributes({ #{hash_content} }, nil)"] end
Renders attribute values statically.
@param values [Array<AttributeValue>] @return [Array] Temple expression
# File lib/haml/attribute_compiler.rb, line 125 def static_build(values) hash_content = values.group_by(&:key).map do |key, values_for_key| "#{frozen_string(key)} => #{merged_value(key, values_for_key)}" end.join(', ') arguments = [@is_html, @attr_wrapper, @escape_attrs, @hyphenate_data_attrs] code = "::Haml::AttributeBuilder.build_attributes"\ "(#{arguments.map { |a| Haml::Util.inspect_obj(a) }.join(', ')}, { #{hash_content} })" [:static, eval(code).to_s] end
# File lib/haml/attribute_compiler.rb, line 210 def true_value(key) if @is_html [:static, " #{key}"] else [:static, " #{key}=#{@attr_wrapper}#{key}#{@attr_wrapper}"] end end
# File lib/haml/attribute_compiler.rb, line 218 def unique_name @unique_name ||= 0 "_haml_attribute_compiler#{@unique_name += 1}" end