Class: Synvert::Core::Rewriter::Instance

Inherits:
Object
  • Object
show all
Includes:
Helper
Defined in:
lib/synvert/core/rewriter/instance.rb

Overview

Instance is an execution unit, it finds specified ast nodes, checks if the nodes match some conditions, then add, replace or remove code.

One instance can contains one or many [Synvert::Core::Rewriter::Scope] and [Synvert::Rewriter::Condition].

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Helper

#add_arguments_with_parenthesis_if_necessary, #add_curly_brackets_if_necessary, #add_receiver_if_necessary, #reject_keys_from_hash, #strip_brackets

Constructor Details

#initialize(rewriter, file_pattern, &block) ⇒ Synvert::Core::Rewriter::Instance

Initialize an instance.

Parameters:

  • rewriter (Synvert::Core::Rewriter)
  • file_pattern (String) —

    pattern to find files, e.g. spec/*/_spec.rb

  • block (Block) —

    block code to find nodes, match conditions and rewrite code.



78
79
80
81
82
83
84
 
# File 'lib/synvert/core/rewriter/instance.rb', line 78

def initialize(rewriter, file_pattern, &block)
  @rewriter = rewriter
  @actions = []
  @file_pattern = file_pattern
  @block = block
  rewriter.helpers.each { |helper| singleton_class.send(:define_method, helper[:name], &helper[:block]) }
end

Instance Attribute Details

#current_file ⇒ Object

Returns current filename.

Returns:

  • current filename



65
 
# File 'lib/synvert/core/rewriter/instance.rb', line 65

attr_accessor :current_node, :current_file

#current_node ⇒ Object

Returns current parsing node.

Returns:

  • current parsing node



65
66
67
 
# File 'lib/synvert/core/rewriter/instance.rb', line 65

def current_node
  @current_node
end

Class Method Details

.file_ast(file_path) ⇒ String

Cached file ast.

Parameters:

  • file_path (String) —

    file path

Returns:

  • (String) —

    ast node for file



30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/synvert/core/rewriter/instance.rb', line 30

def file_ast(file_path)
  @file_ast ||= {}
  @file_ast[file_path] ||=
    begin
      buffer = Parser::Source::Buffer.new file_path
      buffer.source = file_source(file_path)

      parser = Parser::CurrentRuby.new
      parser.reset
      parser.parse buffer
    end
end

.file_source(file_path) ⇒ String

Cached file source.

Parameters:

  • file_path (String) —

    file path

Returns:

  • (String) —

    file source



16
17
18
19
20
21
22
23
24
 
# File 'lib/synvert/core/rewriter/instance.rb', line 16

def file_source(file_path)
  @file_source ||= {}
  @file_source[file_path] ||=
    begin
      source = File.read(file_path, encoding: 'UTF-8')
      source = Engine::ERB.encode(source) if /\.erb$/.match?(file_path)
      source
    end
end

.reset ⇒ Object

Reset cached file source and ast.



55
56
57
58
 
# File 'lib/synvert/core/rewriter/instance.rb', line 55

def reset
  @file_source = {}
  @file_ast = {}
end

.write_file(file_path, source) ⇒ Object

Write source to file and remove cached file source and ast.

Parameters:

  • file_path (String) —

    file path

  • source (String) —

    file source



47
48
49
50
51
52
 
# File 'lib/synvert/core/rewriter/instance.rb', line 47

def write_file(file_path, source)
  source = Engine::ERB.decode(source) if /\.erb/.match?(file_path)
  File.write file_path, source.gsub(/ +\n/, "\n")
  @file_source[file_path] = nil
  @file_ast[file_path] = nil
end

Instance Method Details

#any_value ⇒ Object

Any value but nil.



304
305
306
 
# File 'lib/synvert/core/rewriter/instance.rb', line 304

def any_value
  Rewriter::AnyValue.new
end

#append(code) ⇒ Object

Parse append dsl, it creates a [Synvert::Core::Rewriter::AppendAction] to append the code to the bottom of current node body.

Parameters:

  • code (String) —

    code need to be appended.



223
224
225
 
# File 'lib/synvert/core/rewriter/instance.rb', line 223

def append(code)
  @actions << Rewriter::AppendAction.new(self, code)
end

#delete(*selectors) ⇒ Object

Parse delete dsl, it creates a [Synvert::Core::Rewriter::DeleteAction] to delete child nodes.

Parameters:

  • selectors (Array<Symbol>) —

    selector names of child node.



283
284
285
 
# File 'lib/synvert/core/rewriter/instance.rb', line 283

def delete(*selectors)
  @actions << Rewriter::DeleteAction.new(self, *selectors)
end

#file_source ⇒ Object

Current file source



68
69
70
 
# File 'lib/synvert/core/rewriter/instance.rb', line 68

def file_source
  self.class.file_source(current_file)
end

#goto_node(child_node_name, &block) ⇒ Object

Parse goto_node dsl, it creates a [Synvert::Core::Rewriter::GotoScope] to go to a child node, then continue operating on the child node.

Parameters:

  • child_node_name (Symbol|String) —

    the name of the child nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



187
188
189
 
# File 'lib/synvert/core/rewriter/instance.rb', line 187

def goto_node(child_node_name, &block)
  Rewriter::GotoScope.new(self, child_node_name, &block).process
end

#if_exist_node(rules, &block) ⇒ Object

Parse if_exist_node dsl, it creates a [Synvert::Core::Rewriter::IfExistCondition] to check if matching nodes exist in the child nodes, if so, then continue operating on each matching ast node.

Parameters:

  • rules (Hash) —

    rules to check mathing ast nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



196
197
198
 
# File 'lib/synvert/core/rewriter/instance.rb', line 196

def if_exist_node(rules, &block)
  Rewriter::IfExistCondition.new(self, rules, &block).process
end

#if_only_exist_node(rules, &block) ⇒ Object

Parse if_only_exist_node dsl, it creates a [Synvert::Core::Rewriter::IfOnlyExistCondition] to check if current node has only one child node and the child node matches rules, if so, then continue operating on each matching ast node.

Parameters:

  • rules (Hash) —

    rules to check mathing ast nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



215
216
217
 
# File 'lib/synvert/core/rewriter/instance.rb', line 215

def if_only_exist_node(rules, &block)
  Rewriter::IfOnlyExistCondition.new(self, rules, &block).process
end

#insert(code, at: 'end') ⇒ Object

Parse insert dsl, it creates a [Synvert::Core::Rewriter::InsertAction] to insert the code to the top of current node body.

Parameters:

  • code (String) —

    code need to be inserted.

  • at (String) (defaults to: 'end') —

    insert position, beginning or end, end is the default.



240
241
242
 
# File 'lib/synvert/core/rewriter/instance.rb', line 240

def insert(code, at: 'end')
  @actions << Rewriter::InsertAction.new(self, code, at: at)
end

#insert_after(node) ⇒ Object

Parse insert_after dsl, it creates a [Synvert::Core::Rewriter::InsertAfterAction] to insert the code next to the current node.

Parameters:

  • code (String) —

    code need to be inserted.



248
249
250
 
# File 'lib/synvert/core/rewriter/instance.rb', line 248

def insert_after(node)
  @actions << Rewriter::InsertAfterAction.new(self, node)
end

#node ⇒ Parser::AST::Node

Gets current node, it allows to get current node in block code.

Returns:



131
132
133
 
# File 'lib/synvert/core/rewriter/instance.rb', line 131

def node
  @current_node
end

#prepend(code) ⇒ Object

Parse prepend dsl, it creates a [Synvert::Core::Rewriter::PrependAction] to prepend the code to the top of current node body.

Parameters:

  • code (String) —

    code need to be prepended.



231
232
233
 
# File 'lib/synvert/core/rewriter/instance.rb', line 231

def prepend(code)
  @actions << Rewriter::PrependAction.new(self, code)
end

#process ⇒ Object

Process the instance. It finds all files, for each file, it executes the block code, gets all rewrite actions, and rewrite source code back to original file.



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/synvert/core/rewriter/instance.rb', line 89

def process
  file_pattern = File.join(Configuration.path, @file_pattern)
  Dir.glob(file_pattern).each do |file_path|
    next if Configuration.skip_files.include? file_path

    begin
      puts file_path if Configuration.show_run_process
      conflict_actions = []
      source = +self.class.file_source(file_path)
      ast = self.class.file_ast(file_path)

      @current_file = file_path

      process_with_node ast do
        begin
          instance_eval(&@block)
        rescue NoMethodError
          puts @current_node.debug_info
          raise
        end
      end

      if @actions.length > 0
        @actions.sort_by! { |action| [action.begin_pos, action.end_pos] }
        conflict_actions = get_conflict_actions
        @actions.reverse_each do |action|
          source[action.begin_pos...action.end_pos] = action.rewritten_code
        end
        @actions = []

        update_file(file_path, source)
      end
    rescue Parser::SyntaxError
      puts "[Warn] file #{file_path} was not parsed correctly."
      # do nothing, iterate next file
    end while !conflict_actions.empty?
  end
end

#process_with_node(node) { ... } ⇒ Object

Set current_node to node and process.

Parameters:

Yields:

  • process



139
140
141
142
143
 
# File 'lib/synvert/core/rewriter/instance.rb', line 139

def process_with_node(node)
  self.current_node = node
  yield
  self.current_node = node
end

#process_with_other_node(node) { ... } ⇒ Object

Set current_node properly, process and set current_node back to original current_node.

Parameters:

Yields:

  • process



149
150
151
152
153
154
 
# File 'lib/synvert/core/rewriter/instance.rb', line 149

def process_with_other_node(node)
  original_node = current_node
  self.current_node = node
  yield
  self.current_node = original_node
end

#remove ⇒ Object

Parse remove dsl, it creates a [Synvert::Core::Rewriter::RemoveAction] to remove current node.



276
277
278
 
# File 'lib/synvert/core/rewriter/instance.rb', line 276

def remove
  @actions << Rewriter::RemoveAction.new(self)
end

#replace(*selectors, with:) ⇒ Object

Parse replace with dsl, it creates a [Synvert::Core::Rewriter::ReplaceAction] to replace child nodes with code.

Parameters:

  • selectors (Array<Symbol>) —

    selector names of child node.

  • with (String) —

    code need to be replaced with.



265
266
267
 
# File 'lib/synvert/core/rewriter/instance.rb', line 265

def replace(*selectors, with:)
  @actions << Rewriter::ReplaceAction.new(self, *selectors, with: with)
end

#replace_erb_stmt_with_expr ⇒ Object

Parse replace_erb_stmt_with_expr dsl, it creates a [Synvert::Core::Rewriter::ReplaceErbStmtWithExprAction] to replace erb stmt code to expr code.



271
272
273
 
# File 'lib/synvert/core/rewriter/instance.rb', line 271

def replace_erb_stmt_with_expr
  @actions << Rewriter::ReplaceErbStmtWithExprAction.new(self)
end

#replace_with(code) ⇒ Object

Parse replace_with dsl, it creates a [Synvert::Core::Rewriter::ReplaceWithAction] to replace current node with code.

Parameters:

  • code (String) —

    code need to be replaced with.



256
257
258
 
# File 'lib/synvert/core/rewriter/instance.rb', line 256

def replace_with(code)
  @actions << Rewriter::ReplaceWithAction.new(self, code)
end

#unless_exist_node(rules, &block) ⇒ Object

Parse unless_exist_node dsl, it creates a [Synvert::Core::Rewriter::UnlessExistCondition] to check if matching nodes doesn’t exist in the child nodes, if so, then continue operating on each matching ast node.

Parameters:

  • rules (Hash) —

    rules to check mathing ast nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



205
206
207
 
# File 'lib/synvert/core/rewriter/instance.rb', line 205

def unless_exist_node(rules, &block)
  Rewriter::UnlessExistCondition.new(self, rules, &block).process
end

#warn(message) ⇒ Object

Parse warn dsl, it creates a [Synvert::Core::Rewriter::Warning] to save warning message.

Parameters:

  • message (String) —

    warning message.



299
300
301
 
# File 'lib/synvert/core/rewriter/instance.rb', line 299

def warn(message)
  @rewriter.add_warning Rewriter::Warning.new(self, message)
end

#within_direct_node(rules, &block) ⇒ Object Also known as: with_direct_node

Parse within_direct_node dsl, it creates a [Synvert::Core::Rewriter::WithinScope] to find direct matching ast nodes, then continue operating on each matching ast node.

Parameters:

  • rules (Hash) —

    rules to find mathing ast nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



176
177
178
 
# File 'lib/synvert/core/rewriter/instance.rb', line 176

def within_direct_node(rules, &block)
  Rewriter::WithinScope.new(self, rules, { recursive: false }, &block).process
end

#within_node(rules, &block) ⇒ Object Also known as: with_node

Parse within_node dsl, it creates a [Synvert::Core::Rewriter::WithinScope] to find recursive matching ast nodes, then continue operating on each matching ast node.

Parameters:

  • rules (Hash) —

    rules to find mathing ast nodes.

  • block (Block) —

    block code to continue operating on the matching nodes.



165
166
167
 
# File 'lib/synvert/core/rewriter/instance.rb', line 165

def within_node(rules, &block)
  Rewriter::WithinScope.new(self, rules, { recursive: true }, &block).process
end

#wrap(with:, indent: nil) ⇒ Object

Parse wrap with dsl, it creates a [Synvert::Core::Rewriter::WrapAction] to wrap current node with code.

Parameters:

  • with (String) —

    code need to be wrapped with.

  • indent (Integer) (defaults to: nil) —

    number of whitespaces.



292
293
294
 
# File 'lib/synvert/core/rewriter/instance.rb', line 292

def wrap(with:, indent: nil)
  @actions << Rewriter::WrapAction.new(self, with: with, indent: indent)
end