Class: XDry::Patcher

Inherits:
Object
  • Object
show all
Defined in:
lib/xdry/patching/patcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Patcher

Returns a new instance of Patcher.



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# File 'lib/xdry/patching/patcher.rb', line 8

def initialize
  @patched = {}
  @dry_run = true
end

Instance Attribute Details

#dry_run ⇒ Object

Returns the value of attribute dry_run.



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# File 'lib/xdry/patching/patcher.rb', line 6

def dry_run
  @dry_run
end

#verbose ⇒ Object

Returns the value of attribute verbose.



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# File 'lib/xdry/patching/patcher.rb', line 6

def verbose
  @verbose
end

Instance Method Details

#delete_line(pos) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 21

def delete_line pos
  do_delete_lines pos.file_ref, pos.line_no - 1, 1
end

#do_delete_lines(file_ref, line_index, line_count) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 32

def do_delete_lines file_ref, line_index, line_count
  lines = patched_lines_of(file_ref)

  if @verbose
    puts "DELETING #{line_count} LINE(S) FROM LINE NO.#{line_index+1}:"
    lines[line_index .. line_index+line_count-1].each { |line| puts "    #{line}" }
  end

  file_ref.fixup_positions! line_index+line_count, -line_count
  lines[line_index .. line_index+line_count-1] = []
end

#do_insert_after(file_ref, start_scope, line_index, new_lines, indent, parse) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 44

def do_insert_after file_ref, start_scope, line_index, new_lines, indent, parse
  new_lines = new_lines.collect { |line| line.blank? ? line : indent + line }
  new_lines = new_lines.collect { |line| line.gsub("\t", INDENT_STEP) }
  lines = patched_lines_of(file_ref)

  if @verbose
    puts "INSERTING LINES AFTER LINE NO.#{line_index+1}:"
    new_lines.each { |line| puts "    #{line}" }
    puts "  AFTER LINE:"
    puts "    #{lines[line_index]}"
  end

  # collapse leading/trailing empty lines with the empty lines that already exist
  # in the source code

  # when line_index == -1 (insert at the beginning of the file), there are no leading lines
  if line_index >= 0
    desired_leading_empty_lines = new_lines.prefix_while(&:blank?).length
    actual_leading_empty_lines  = lines[0..line_index].suffix_while(&:blank?).length
    leading_lines_to_remove     = [actual_leading_empty_lines, desired_leading_empty_lines].min
    new_lines = new_lines[leading_lines_to_remove .. -1]
  end

  # if all lines were empty, the number of trailing empty lines might have changed
  # after removal of some leading lines, so we compute this after the removal
  desired_trailing_empty_lines = new_lines.suffix_while(&:blank?).length
  actual_trailing_empty_lines  = lines[line_index+1..-1].prefix_while(&:blank?).length
  trailing_lines_to_remove     = [actual_trailing_empty_lines, desired_trailing_empty_lines].min
  new_lines = new_lines[0 .. -(trailing_lines_to_remove+1)]

  file_ref.fixup_positions! line_index+1, new_lines.size

  lines[line_index+1 .. line_index+1] = new_lines.collect { |line| "#{line}\n" } + [lines[line_index+1]]

  if parse
    driver = ParsingDriver.new(nil)
    driver.verbose = @verbose
    driver.parse_fragment file_ref, new_lines, line_index+1+1, start_scope
  end
end

#insert_after(pos, new_lines, indent = '', parse = true) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 13

def insert_after pos, new_lines, indent = '', parse = true
  do_insert_after pos.file_ref, pos.scope_after, pos.line_no - 1, new_lines, indent || '', parse
end

#insert_before(pos, new_lines, indent = '', parse = true) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 17

def insert_before pos, new_lines, indent = '', parse = true
  do_insert_after pos.file_ref, pos.scope_before, pos.line_no - 2, new_lines, indent || '', parse
end

#remove_marker!(marker) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 117

def remove_marker! marker
  if marker.is_a? NFullLineMarker
    delete_line marker.pos
  else
    replace_line marker.pos do |old_line|
      old_line.gsub(marker.text, '').gsub(/ +$/, '')
    end
  end
end

#replace_line(pos) ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 25

def replace_line pos
  old_line = patched_lines_of(pos.file_ref)[pos.line_no-1].rstrip
  new_line = yield(old_line)
  delete_line pos
  insert_before pos, [new_line], '', false
end

#retrieve! ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 108

def retrieve!
  result = {}
  for file_ref, lines in @patched
    result[file_ref.path] = lines.join("")
  end
  @patched = {}
  return result
end

#save! ⇒ Object 



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# File 'lib/xdry/patching/patcher.rb', line 85

def save!
  changed_file_refs = []
  for file_ref, lines in @patched
    original_path = file_ref.path

    text = lines.join("")
    next if text == file_ref.read

    changed_file_refs << file_ref

    new_path = if @dry_run
      ext = File.extname(original_path)
      File.join(File.dirname(original_path), File.basename(original_path, ext) + '.xdry' + ext)
    else
      original_path
    end

    open(new_path, 'w') { |f| f.write text }
  end
  @patched = {}
  return changed_file_refs
end