Class: SyntaxTree::Statements

Inherits:
Node
  • Object
show all
Defined in:
lib/syntax_tree/node.rb

Overview

Everything that has a block of code inside of it has a list of statements. Normally we would just track those as a node that has an array body, but we have some special handling in order to handle empty statement lists. They need to have the right location information, so all of the parent node of stmts nodes will report back down the location information. We then propagate that onto void_stmt nodes inside the stmts in order to make sure all comments get printed appropriately.

Instance Attribute Summary collapse

Attributes inherited from Node

#location

Instance Method Summary collapse

Methods inherited from Node

#construct_keys, #pretty_print, #to_json

Constructor Details

#initialize(parser, body:, location:, comments: []) ⇒ Statements

Returns a new instance of Statements.



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# File 'lib/syntax_tree/node.rb', line 8297

def initialize(parser, body:, location:, comments: [])
  @parser = parser
  @body = body
  @location = location
  @comments = comments
end

Instance Attribute Details

#body ⇒ Object (readonly)

Array[ untyped ]

the list of expressions contained within this node



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# File 'lib/syntax_tree/node.rb', line 8292

def body
  @body
end

#comments ⇒ Object (readonly)

Array[ Comment | EmbDoc ]

the comments attached to this node



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# File 'lib/syntax_tree/node.rb', line 8295

def comments
  @comments
end

#parser ⇒ Object (readonly)

SyntaxTree

the parser that is generating this node



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# File 'lib/syntax_tree/node.rb', line 8289

def parser
  @parser
end

Instance Method Details

#accept(visitor) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 8351

def accept(visitor)
  visitor.visit_statements(self)
end

#bind(start_char, start_column, end_char, end_column) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 8304

def bind(start_char, start_column, end_char, end_column)
  @location =
    Location.new(
      start_line: location.start_line,
      start_char: start_char,
      start_column: start_column,
      end_line: location.end_line,
      end_char: end_char,
      end_column: end_column
    )

  if body[0].is_a?(VoidStmt)
    location = body[0].location
    location =
      Location.new(
        start_line: location.start_line,
        start_char: start_char,
        start_column: start_column,
        end_line: location.end_line,
        end_char: start_char,
        end_column: end_column
      )

    body[0] = VoidStmt.new(location: location)
  end

  attach_comments(start_char, end_char)
end

#bind_end(end_char, end_column) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 8333

def bind_end(end_char, end_column)
  @location =
    Location.new(
      start_line: location.start_line,
      start_char: location.start_char,
      start_column: location.start_column,
      end_line: location.end_line,
      end_char: end_char,
      end_column: end_column
    )
end

#child_nodes ⇒ Object Also known as: deconstruct 



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# File 'lib/syntax_tree/node.rb', line 8355

def child_nodes
  body
end

#deconstruct_keys(_keys) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 8361

def deconstruct_keys(_keys)
  { parser: parser, body: body, location: location, comments: comments }
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/syntax_tree/node.rb', line 8345

def empty?
  body.all? do |statement|
    statement.is_a?(VoidStmt) && statement.comments.empty?
  end
end

#format(q) ⇒ Object 



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# File 'lib/syntax_tree/node.rb', line 8365

def format(q)
  line = nil

  # This handles a special case where you've got a block of statements where
  # the only value is a comment. In that case a lot of nodes like
  # brace_block will attempt to format as a single line, but since that
  # wouldn't work with a comment, we intentionally break the parent group.
  if body.length == 2
    void_stmt, comment = body

    if void_stmt.is_a?(VoidStmt) && comment.is_a?(Comment)
      q.format(comment)
      q.break_parent
      return
    end
  end

  previous = nil
  body.each do |statement|
    next if statement.is_a?(VoidStmt)

    if line.nil?
      q.format(statement)
    elsif (statement.location.start_line - line) > 1
      q.breakable_force
      q.breakable_force
      q.format(statement)
    elsif (statement.is_a?(VCall) && statement.access_control?) ||
          (previous.is_a?(VCall) && previous.access_control?)
      q.breakable_force
      q.breakable_force
      q.format(statement)
    elsif statement.location.start_line != line
      q.breakable_force
      q.format(statement)
    elsif !q.parent.is_a?(StringEmbExpr)
      q.breakable_force
      q.format(statement)
    else
      q.text("; ")
      q.format(statement)
    end

    line = statement.location.end_line
    previous = statement
  end
end