Class: Rpatch::PatchHunk

Inherits:
Object
  • Object
show all
Defined in:
lib/rpatch/hunk.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text, num = nil) ⇒ PatchHunk

Returns a new instance of PatchHunk.



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# File 'lib/rpatch/hunk.rb', line 7

def initialize(text, num=nil)
  @title = text.chomp.sub(/^@@/, '').strip
  @num = num || "#"
  @diffs = []
end

Instance Attribute Details

#diffs ⇒ Object (readonly)

Returns the value of attribute diffs.



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# File 'lib/rpatch/hunk.rb', line 5

def diffs
  @diffs
end

#num ⇒ Object (readonly)

Returns the value of attribute num.



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# File 'lib/rpatch/hunk.rb', line 5

def num
  @num
end

#title ⇒ Object (readonly)

Returns the value of attribute title.



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# File 'lib/rpatch/hunk.rb', line 5

def title
  @title
end

Instance Method Details

#convert(lines) ⇒ Object

Apply patch on lines. Return array of strings contain result of applying patch.



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# File 'lib/rpatch/hunk.rb', line 45

def convert(lines)
  lines_dup = lines.dup
  result = []
  i = 0
  while i < @diffs.size
    case @diffs[i]
    when /^( |RE: )/
      while true
        match =  match_line lines_dup.first, patterns[i]
        if not match
          raise PatchFormatError.new("Hunk #{num} (#{title}) FAILED to apply. No match \"#{patterns[i]}\" with #{lines_dup.first.inspect}.")
        elsif match > 0
          result << lines_dup.shift
          break
        elsif match == 0
          result << lines_dup.shift
        end
      end
    when /^(-|RE:-)/
      while true
        match =  match_line lines_dup.first, patterns[i]
        if not match
          raise PatchFormatError.new("Hunk #{num} (#{title}) FAILED to apply. No match pattern \"#{patterns[i]}\" against #{lines_dup.first.inspect}.")
        elsif match > 0
          lines_dup.shift
          break
        elsif match == 0
          lines_dup.shift
        end
      end
    when /^\+/
      result << @diffs[i][1..-1]
    else
      raise PatchFormatError.new("Hunk #{num} (#{title}) FAILED to apply. Unknow syntax in hunk: #{@diffs[i]}")
    end
    i += 1
  end
  result
end

#feed_line(line) ⇒ Object 



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# File 'lib/rpatch/hunk.rb', line 13

def feed_line(line)
  diffs << line.chomp
end

#match_after_patch(lines) ⇒ Object

Return [location, num_of_lines], which seems already patched, and match start with location and num lines are matched. Return nil, if nothing matched.



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# File 'lib/rpatch/hunk.rb', line 88

def match_after_patch(lines)
  i = 0
  if patterns_after_patch.size == 0
    return [0, 0]
  end

  loop_n = lines.size
  loop_n = loop_n - patterns_after_patch.size + 1 if patterns_after_patch.size > 0
  while i < loop_n
    matched_line_no = match_beginning(lines[i..-1], patterns_after_patch)
    if matched_line_no
      return [i, matched_line_no]
    else
      i += 1
    end
  end
  nil
end

#match_before_patch(lines) ⇒ Object

Return [location, num_of_lines], which could apply patch at at location, and num lines would be replaced. Return nil, if nothing matched.



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# File 'lib/rpatch/hunk.rb', line 110

def match_before_patch(lines)
  i = 0
  if patterns_before_patch.size == 0
    return [0, 0]
  end

  loop_n = lines.size
  loop_n = loop_n - patterns_before_patch.size + 1 if patterns_before_patch.size > 0

  while i < loop_n
    matched_size = match_beginning(lines[i..-1], patterns_before_patch)
    if matched_size
      return [i, matched_size]
    else
      i += 1
    end
  end
  nil
end

#match_beginning(lines, patterns) ⇒ Object

Test whether patterns match against the beginning of lines Return nil if not match, or return number of lines matched with patterns (would be replaced later).



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# File 'lib/rpatch/hunk.rb', line 133

def match_beginning(lines, patterns)
  i = 0
  found = true
  patterns.each do |pattern|
    unless lines[i]
      found = false
      break
    end

    while true
      match = match_line lines[i], pattern
      if not match
        found = false
        break
      # Match precisely for the first line of pattern (i==0),
      # Not pass blank lines.
      elsif match == 0 and i == 0
        found = false
        break
      # Matched.
      elsif match > 0
        break
      # Match next line if this line is blank.
      elsif match == 0
        i += 1
        unless lines[i]
          found = false
          break
        end
      # Never comes here.
      else
        found = false
        break
      end
    end

    break unless found
    i += 1
  end

  if found
    i
  else
    nil
  end
end

#match_line(message, pattern) ⇒ Object 



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# File 'lib/rpatch/hunk.rb', line 180

def match_line(message , pattern)
  return nil unless message
  line = nil
  match = nil
  while true
    if pattern.is_a? Regexp
      # When match with regexp, do not twick message
      line ||= message.dup
      if pattern.match(line)
        match = 1
      end
    else
      line ||= message.strip.gsub(/\s+/, ' ')
      if pattern == line
        match = 1
      end
    end

    if match
      break
    elsif line.empty?
      match = 0
      break
    elsif line.start_with? "#"
      while line.start_with? "#"
        line = line[1..-1]
        line = line.strip unless pattern.is_a? Regexp
      end
    else
      break
    end
  end
  match
end

#patch(lines) ⇒ Object

Patch lines in place.



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# File 'lib/rpatch/hunk.rb', line 18

def patch(lines)
  matched_before = match_before_patch lines
  matched_after = match_after_patch lines

  if patterns_before_patch.size > patterns_after_patch.size
    if not matched_before
      if matched_after
        raise AlreadyPatchedError.new("Hunk #{num} (#{title}) is already patched.")
      else
        raise PatchHunkError, "Hunk #{num} (#{title}) FAILED to apply. Match failed."
      end
    end
  else
    if matched_after
      raise AlreadyPatchedError.new("Hunk #{num} (#{title}) is already patched.")
    elsif not matched_before
      raise PatchHunkError, "Hunk #{num} (#{title}) FAILED to apply. Match failed."
    end
  end

  n, size = matched_before
  lines[n...(n+size)] = convert lines[n...(n+size)]
  lines
end

#patterns ⇒ Object 



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# File 'lib/rpatch/hunk.rb', line 253

def patterns
  @patterns ||= begin
    result = []
    @diffs.each do |line|
      case line
      when /^( |\+|-)/
        result << line[1..-1].strip.gsub(/\s+/, ' ')
      when /^(RE: |RE:-)/
        result << Regexp.new(line[4..-1].strip)
      else
        raise PatchFormatError.new("Unknown pattern in diffs: #{line}")
      end
    end
    result
  end
end

#patterns_after_patch ⇒ Object 



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# File 'lib/rpatch/hunk.rb', line 234

def patterns_after_patch
  @patterns_after_patch ||= begin
    result = []
    @diffs.each do |line|
      case line
      when /^( |\+)/
        result << line[1..-1].strip.gsub(/\s+/, ' ')
      when /^(RE: )/
        result << Regexp.new(line[4..-1].strip)
      when /^(-|RE:-)/
        next
      else
        raise PatchFormatError.new("Unknown pattern in diffs: #{line}")
      end
    end
    result
  end
end

#patterns_before_patch ⇒ Object 



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# File 'lib/rpatch/hunk.rb', line 215

def patterns_before_patch
  @patterns_before_patch ||= begin
    result = []
    @diffs.each do |line|
      case line
      when /^( |-)/
        result << line[1..-1].strip.gsub(/\s+/, ' ')
      when /^(RE: |RE:-)/
        result << Regexp.new(line[4..-1].strip)
      when /^\+/
        next
      else
        raise PatchFormatError.new("Unknown pattern in diffs: #{line}")
      end
    end
    result
  end
end