Class: RuboCop::Cop::FormulaCop

Inherits:
RuboCop::Cop show all
Defined in:
Library/Homebrew/rubocops/extend/formula_cop.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#file_path ⇒ Object

Returns the value of attribute file_path


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 7

def file_path
  @file_path
end

Instance Method Details

#audit_comments ⇒ Object

Yields to a block with comment text as parameter


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 381

def audit_comments
  @processed_source.comments.each do |comment_node|
    @offensive_node = comment_node
    @offense_source_range = :expression
    yield comment_node.text
  end
end

#audit_urls(urls, regex) ⇒ Object

Yields to block when there is a match Parameters: urls : Array of url/mirror method call nodes

regex: regex pattern to match urls


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 45

def audit_urls(urls, regex)
  urls.each do |url_node|
    url_string_node = parameters(url_node).first
    url_string = string_content(url_string_node)
    match_object = regex_match_group(url_string_node, regex)
    next unless match_object
    offending_node(url_string_node.parent)
    yield match_object, url_string
  end
end

#block_size(block) ⇒ Object

Returns the block length of the block node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 427

def block_size(block)
  block.loc.end.line - block.loc.begin.line
end

#caveats_strings ⇒ Object

Return all the caveats' string nodes in an array


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 342

def caveats_strings
  find_strings(find_method_def(@body, :caveats))
end

#check_precedence(first_nodes, next_nodes) ⇒ Object

Checks for precedence, returns the first pair of precedence violating nodes


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 315

def check_precedence(first_nodes, next_nodes)
  next_nodes.each do |each_next_node|
    first_nodes.each do |each_first_node|
      if component_precedes?(each_first_node, each_next_node)
        return [each_first_node, each_next_node]
      end
    end
  end
  nil
end

#class_name(node) ⇒ Object

Returns the class node's name, nil if not a class node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 410

def class_name(node)
  @offensive_node = node
  @offense_source_range = node.source_range
  node.const_name
end

#component_precedes?(first_node, next_node) ⇒ Boolean

If first node does not precede next_node, sets appropriate instance variables for reporting


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 327

def component_precedes?(first_node, next_node)
  return false if line_number(first_node) < line_number(next_node)
  @offense_source_range = first_node.source_range
  @offensive_node = first_node
  true
end

#depends_on?(dependency_name, *types) ⇒ Boolean

Returns nil if does not depend on dependency_name args: node - dependency_name - dependency's name


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 148

def depends_on?(dependency_name, *types)
  types = [:any] if types.empty?
  dependency_nodes = find_every_method_call_by_name(@body, :depends_on)
  idx = dependency_nodes.index do |n|
    types.any? { |type| depends_on_name_type?(n, dependency_name, type) }
  end
  return if idx.nil?
  @offense_source_range = dependency_nodes[idx].source_range
  @offensive_node = dependency_nodes[idx]
end

#depends_on_name_type?(node, name = nil, type = :required) ⇒ Boolean

Returns true if given dependency name and dependency type exist in given dependency method call node TODO: Add case where key of hash is an array


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 161

def depends_on_name_type?(node, name = nil, type = :required)
  if name
    name_match = false
  else
    name_match = true # Match only by type when name is nil
  end

  case type
  when :required
    type_match = required_dependency?(node)
    name_match ||= required_dependency_name?(node, name) if type_match
  when :build, :optional, :recommended, :run
    type_match = dependency_type_hash_match?(node, type)
    name_match ||= dependency_name_hash_match?(node, name) if type_match
  when :any
    type_match = true
    name_match ||= required_dependency_name?(node, name)
    name_match ||= dependency_name_hash_match?(node, name)
  else
    type_match = false
  end

  if type_match || name_match
    @offensive_node = node
    @offense_source_range = node.source_range
  end
  type_match && name_match
end

#end_column(node) ⇒ Object

Returns the ending position of the node in source code


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 400

def end_column(node)
  node.source_range.end_pos
end

#expression_negated?(node) ⇒ Boolean

Check if negation is present in the given node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 335

def expression_negated?(node)
  return false if node.parent.nil?
  return false unless node.parent.method_name.equal?(:!)
  offending_node(node.parent)
end

#find_all_blocks(node, block_name) ⇒ Object

Returns an array of block nodes of any depth below node in AST If a block is given then yields matching block node to the block!


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 248

def find_all_blocks(node, block_name)
  return if node.nil?
  blocks = node.each_descendant(:block).select { |block_node| block_name == block_node.method_name }
  return blocks unless block_given?
  blocks.each do |block_node|
    offending_node(block_node)
    yield block_node
  end
end

#find_block(node, block_name) ⇒ Object

Returns a block named block_name inside node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 226

def find_block(node, block_name)
  return if node.nil?
  node.each_child_node(:block) do |block_node|
    next if block_node.method_name != block_name
    @offensive_node = block_node
    @offense_source_range = block_node.source_range
    return block_node
  end
  # If not found then, parent node becomes the offensive node
  @offensive_node = node.parent
  @offense_source_range = node.parent.source_range
  nil
end

#find_blocks(node, block_name) ⇒ Object

Returns an array of block nodes named block_name inside node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 241

def find_blocks(node, block_name)
  return if node.nil?
  node.each_child_node(:block).select { |block_node| block_name == block_node.method_name }
end

#find_const(node, const_name) ⇒ Object

Find CONSTANTs in the source if block given, yield matching nodes


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 192

def find_const(node, const_name)
  return if node.nil?
  node.each_descendant(:const) do |const_node|
    next unless const_node.const_name == const_name
    @offensive_node = const_node
    @offense_source_range = const_node.source_range
    yield const_node if block_given?
    return true
  end
  nil
end

#find_every_method_call_by_name(node, method_name = nil) ⇒ Object

Returns an array of method call nodes matching method_name in every descendant of node Returns every method call if no method_name is passed


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 92

def find_every_method_call_by_name(node, method_name = nil)
  return if node.nil?
  node.each_descendant(:send).select do |method_node|
    method_name.nil? ||
      method_name == method_node.method_name
  end
end

#find_instance_call(node, name) ⇒ Object

Matches receiver part of method, EX: to match `ARGV.<whatever>()` call `find_instance_call(node, “ARGV”)` yields to a block with parent node of receiver


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 134

def find_instance_call(node, name)
  node.each_descendant(:send) do |method_node|
    next if method_node.receiver.nil?
    next if method_node.receiver.const_name != name &&
            method_node.receiver.method_name != name
    @offense_source_range = method_node.receiver.source_range
    @offensive_node = method_node.receiver
    return true unless block_given?
    yield method_node
  end
end

#find_instance_method_call(node, instance, method_name) ⇒ Object

Matches a method with a receiver, EX: to match `Formula.factory(name)` call `find_instance_method_call(node, “Formula”, :factory)` EX: to match `build.head?` call `find_instance_method_call(node, :build, :head?)` yields to a block with matching method node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 117

def find_instance_method_call(node, instance, method_name)
  methods = find_every_method_call_by_name(node, method_name)
  methods.each do |method|
    next if method.receiver.nil?
    next if method.receiver.const_name != instance &&
            method.receiver.method_name != instance
    @offense_source_range = method.source_range
    @offensive_node = method
    return true unless block_given?
    yield method
  end
end

#find_method_calls_by_name(node, method_name) ⇒ Object

Returns an array of method call nodes matching method_name inside node with depth first order (Children nodes)


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 85

def find_method_calls_by_name(node, method_name)
  return if node.nil?
  node.each_child_node(:send).select { |method_node| method_name == method_node.method_name }
end

#find_method_def(node, method_name = nil) ⇒ Object

Returns a method definition node with method_name Returns first method def if method_name is nil


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 260

def find_method_def(node, method_name = nil)
  return if node.nil?
  node.each_child_node(:def) do |def_node|
    def_method_name = method_name(def_node)
    next unless method_name == def_method_name || method_name.nil?
    @offensive_node = def_node
    @offense_source_range = def_node.source_range
    return def_node
  end
  return if node.parent.nil?
  # If not found then, parent node becomes the offensive node
  @offensive_node = node.parent
  @offense_source_range = node.parent.source_range
  nil
end

#find_method_with_args(node, method_name, *args) ⇒ Object

Given a method_name and arguments, yields to a block with matching method passed as a parameter to the block


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 102

def find_method_with_args(node, method_name, *args)
  methods = find_every_method_call_by_name(node, method_name)
  methods.each do |method|
    next unless parameters_passed?(method, *args)
    return true unless block_given?
    yield method
  end
end

#find_node_method_by_name(node, method_name) ⇒ Object

Returns method_node matching method_name


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 64

def find_node_method_by_name(node, method_name)
  return if node.nil?
  node.each_child_node(:send) do |method_node|
    next unless method_node.method_name == method_name
    @offensive_node = method_node
    @offense_source_range = method_node.source_range
    return method_node
  end
  # If not found then, parent node becomes the offensive node
  @offensive_node = node.parent
  @offense_source_range = node.parent.source_range
  nil
end

#find_strings(node) ⇒ Object

Returns all string nodes among the descendants of given node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 57

def find_strings(node)
  return [] if node.nil?
  return node if node.str_type?
  node.each_descendant(:str)
end

#format_component(component_node) ⇒ Object

Returns printable component name


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 458

def format_component(component_node)
  return component_node.method_name if component_node.send_type? || component_node.block_type?
  method_name(component_node) if component_node.def_type?
end

#formula_tap ⇒ Object

Returns the formula tap


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 464

def formula_tap
  return unless match_obj = @file_path.match(%r{/(homebrew-\w+)/})
  match_obj[1]
end

#get_checksum_node(call) ⇒ Object

Returns the sha256 str node given a sha256 call node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 370

def get_checksum_node(call)
  return if parameters(call).empty? || parameters(call).nil?
  if parameters(call).first.str_type?
    parameters(call).first
  # sha256 is passed as a key-value pair in bottle blocks
  elsif parameters(call).first.hash_type?
    parameters(call).first.keys.first
  end
end

#line_number(node) ⇒ Object

Returns the line number of the node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 405

def line_number(node)
  node.loc.line
end

#line_start_column(node) ⇒ Object

Returns the begin position of the node's line in source code


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 390

def line_start_column(node)
  node.source_range.source_buffer.line_range(node.loc.line).begin_pos
end

#method_called?(node, method_name) ⇒ Boolean

Check if method_name is called among the direct children nodes in the given node Check if the node itself is the method


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 290

def method_called?(node, method_name)
  if node.send_type? && node.method_name == method_name
    offending_node(node)
    return true
  end
  node.each_child_node(:send) do |call_node|
    next unless call_node.method_name == method_name
    offending_node(call_node)
    return true
  end
  false
end

#method_called_ever?(node, method_name) ⇒ Boolean

Check if method_name is called among every descendant node of given node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 304

def method_called_ever?(node, method_name)
  node.each_descendant(:send) do |call_node|
    next unless call_node.method_name == method_name
    @offensive_node = call_node
    @offense_source_range = call_node.source_range
    return true
  end
  false
end

#method_called_in_block?(node, method_name) ⇒ Boolean

Check if a method is called inside a block


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 277

def method_called_in_block?(node, method_name)
  block_body = node.children[2]
  block_body.each_child_node(:send) do |call_node|
    next unless call_node.method_name == method_name
    @offensive_node = call_node
    @offense_source_range = call_node.source_range
    return true
  end
  false
end

#method_name(node) ⇒ Object

Returns the method name for a def node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 417

def method_name(node)
  node.children[0] if node.def_type?
end

#node_equals?(node, var) ⇒ Boolean

To compare node with appropriate Ruby variable


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 221

def node_equals?(node, var)
  node == Parser::CurrentRuby.parse(var.inspect)
end

#offending_node(node) ⇒ Object

Set the given node as the offending node when required in custom cops


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 79

def offending_node(node)
  @offensive_node = node
  @offense_source_range = node.source_range
end

#on_class(node) ⇒ Object

This method is called by RuboCop and is the main entry point


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 11

def on_class(node)
  @file_path = processed_source.buffer.name
  return unless file_path_allowed?
  return unless formula_class?(node)
  return unless respond_to?(:audit_formula)
  class_node, parent_class_node, @body = *node
  @formula_name = Pathname.new(@file_path).basename(".rb").to_s
  audit_formula(node, class_node, parent_class_node, @body)
end

#parameters(method_node) ⇒ Object

Returns the array of arguments of the method_node


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 347

def parameters(method_node)
  method_node.arguments if method_node.send_type? || method_node.block_type?
end

#parameters_passed?(method_node, *params) ⇒ Boolean

Returns true if the given parameters are present in method call and sets the method call as the offending node params can be string, symbol, array, hash, matching regex


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 354

def parameters_passed?(method_node, *params)
  method_params = parameters(method_node)
  @offensive_node = method_node
  @offense_source_range = method_node.source_range
  params.all? do |given_param|
    method_params.any? do |method_param|
      if given_param.class == Regexp
        regex_match_group(method_param, given_param)
      else
        node_equals?(method_param, given_param)
      end
    end
  end
end

#problem(msg) ⇒ Object 


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 469

def problem(msg)
  add_offense(@offensive_node, location: @offense_source_range, message: msg)
end

#regex_match_group(node, pattern) ⇒ Object

Checks for regex match of pattern in the node and Sets the appropriate instance variables to report the match


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 23

def regex_match_group(node, pattern)
  string_repr = string_content(node)
  match_object = string_repr.match(pattern)
  return unless match_object
  node_begin_pos = start_column(node)
  line_begin_pos = line_start_column(node)
  if node_begin_pos == line_begin_pos
    @column = node_begin_pos + match_object.begin(0) - line_begin_pos
  else
    @column = node_begin_pos + match_object.begin(0) - line_begin_pos + 1
  end
  @length = match_object.to_s.length
  @line_no = line_number(node)
  @source_buf = source_buffer(node)
  @offense_source_range = source_range(@source_buf, @line_no, @column, @length)
  @offensive_node = node
  match_object
end

#size(node) ⇒ Object

Returns the node size in the source code


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 422

def size(node)
  node.source_range.size
end

#source_buffer(node) ⇒ Object

Source buffer is required as an argument to report style violations


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 432

def source_buffer(node)
  node.source_range.source_buffer
end

#start_column(node) ⇒ Object

Returns the begin position of the node in source code


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 395

def start_column(node)
  node.source_range.begin_pos
end

#string_content(node) ⇒ Object

Returns the string representation if node is of type str(plain) or dstr(interpolated) or const


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 437

def string_content(node)
  case node.type
  when :str
    node.str_content
  when :dstr
    node.each_child_node(:str).map(&:str_content).join("")
  when :const
    node.const_name
  when :sym
    node.children.first.to_s
  else
    ""
  end
end

#versioned_formula? ⇒ Boolean

Returns true if the formula is versioned


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# File 'Library/Homebrew/rubocops/extend/formula_cop.rb', line 453

def versioned_formula?
  @formula_name.include?("@")
end