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Edit File : newlines.rb \| Size : 1.95 KB
# frozen_string_literal: true module Prism class ParseResult # The :line tracepoint event gets fired whenever the Ruby VM encounters an # expression on a new line. The types of expressions that can trigger this # event are: # # * if statements # * unless statements # * nodes that are children of statements lists # # In order to keep track of the newlines, we have a list of offsets that # come back from the parser. We assign these offsets to the first nodes that # we find in the tree that are on those lines. # # Note that the logic in this file should be kept in sync with the Java # MarkNewlinesVisitor, since that visitor is responsible for marking the # newlines for JRuby/TruffleRuby. class Newlines < Visitor # Create a new Newlines visitor with the given newline offsets. def initialize(newline_marked) @newline_marked = newline_marked end # Permit block/lambda nodes to mark newlines within themselves. def visit_block_node(node) old_newline_marked = @newline_marked @newline_marked = Array.new(old_newline_marked.size, false) begin super(node) ensure @newline_marked = old_newline_marked end end alias_method :visit_lambda_node, :visit_block_node # Mark if/unless nodes as newlines. def visit_if_node(node) node.set_newline_flag(@newline_marked) super(node) end alias_method :visit_unless_node, :visit_if_node # Permit statements lists to mark newlines within themselves. def visit_statements_node(node) node.body.each do \|child\| child.set_newline_flag(@newline_marked) end super(node) end end private_constant :Newlines # Walk the tree and mark nodes that are on a new line. def mark_newlines! value.accept(Newlines.new(Array.new(1 + source.offsets.size, false))) end end end Back

Edit File : newlines.rb | Size : 1.95 KB

# frozen_string_literal: true

module Prism
  class ParseResult
    # The :line tracepoint event gets fired whenever the Ruby VM encounters an
    # expression on a new line. The types of expressions that can trigger this
    # event are:
    #
    # * if statements
    # * unless statements
    # * nodes that are children of statements lists
    #
    # In order to keep track of the newlines, we have a list of offsets that
    # come back from the parser. We assign these offsets to the first nodes that
    # we find in the tree that are on those lines.
    #
    # Note that the logic in this file should be kept in sync with the Java
    # MarkNewlinesVisitor, since that visitor is responsible for marking the
    # newlines for JRuby/TruffleRuby.
    class Newlines < Visitor
      # Create a new Newlines visitor with the given newline offsets.
      def initialize(newline_marked)
        @newline_marked = newline_marked
      end

# Permit block/lambda nodes to mark newlines within themselves.
      def visit_block_node(node)
        old_newline_marked = @newline_marked
        @newline_marked = Array.new(old_newline_marked.size, false)

begin
          super(node)
        ensure
          @newline_marked = old_newline_marked
        end
      end

alias_method :visit_lambda_node, :visit_block_node

# Mark if/unless nodes as newlines.
      def visit_if_node(node)
        node.set_newline_flag(@newline_marked)
        super(node)
      end

alias_method :visit_unless_node, :visit_if_node

# Permit statements lists to mark newlines within themselves.
      def visit_statements_node(node)
        node.body.each do |child|
          child.set_newline_flag(@newline_marked)
        end
        super(node)
      end
    end

private_constant :Newlines

# Walk the tree and mark nodes that are on a new line.
    def mark_newlines!
      value.accept(Newlines.new(Array.new(1 + source.offsets.size, false)))
    end
  end
end

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