Class: DiffToHtml

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

Direct Known Subclasses

GitDiffToHtml, SvnDiffToHtml

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#file_prefix ⇒ Object

Returns the value of attribute file_prefix.



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# File 'lib/diff_to_html.rb', line 5

def file_prefix
  @file_prefix
end

Instance Method Details

#begin_file(file) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 66

def begin_file(file)
  result = "<li><h2><a name=\"F\#{@filenum}\" href=\"#F\#{@filenum}\">\#{file}</a></h2><table class='diff'>\n<colgroup>\n<col class=\"lineno\"/>\n<col class=\"lineno\"/>\n<col class=\"content\"/>\n</colgroup>\n" 
result
end

#composite_to_html(composite_diff) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 182

def composite_to_html(composite_diff)
  diffs_to_html get_diffs(composite_diff)
end

#diffs_to_html(diffs) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 171

def diffs_to_html(diffs)
  result = '<ul class="diff">'
  @filenum = 0
  diffs.each do |file_map|
    result << get_single_file_diff(file_map[:filename], file_map[:file])
    @filenum += 1
  end
  result << '</ul>'
  result    
end

#file_header_pattern ⇒ Object 



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# File 'lib/diff_to_html.rb', line 153

def file_header_pattern
  raise "Method to be implemented in VCS-specific class"
end

#flush_changes(result, left_ln, right_ln) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 78

def flush_changes(result, left_ln, right_ln)
  x, left_ln, right_ln = get_diff_row(left_ln, right_ln)
  result << x
  @left.clear
  @right.clear    
  return left_ln, right_ln
end

#get_diff_row(left_ln, right_ln) ⇒ Object

helper for building the next row in the diff



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# File 'lib/diff_to_html.rb', line 20

def get_diff_row(left_ln, right_ln)
  result = []
  if @left.length > 0 or @right.length > 0
    modified = (@last_op != ' ')
    if modified
      left_class = " class='r'"
      right_class = " class='a'"
      result << "<tbody class='mod'>"
    else
      left_class = right_class = ''
    end
    result << @left.map do |line| 
      x = "<tr#{left_class}>#{ln_cell(left_ln, 'l')}"
      if modified
        x += ln_cell(nil)
      else
        x += ln_cell(right_ln, 'r')
        right_ln += 1
      end
      x += "<td>#{line}</td></tr>"
      left_ln += 1
      x
    end
    if modified
      result << @right.map do |line| 
        x = "<tr#{right_class}>#{ln_cell(nil)}#{ln_cell(right_ln, 'r')}<td>#{line}</td></tr>"
        right_ln += 1
        x
      end
      result << "</tbody>"
    end
  end
  return result.join("\n"), left_ln, right_ln
end

#get_diffs(composite_diff) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 157

def get_diffs(composite_diff)
  pattern = file_header_pattern
  files = composite_diff.split(pattern)
  headers = composite_diff.scan(pattern) #huh can't find a way to get both at once
  files.shift if files[0] == '' #first one is junk usually
  result = []
  i = 0
  files.each do |file|
    result << {:filename => "#{file_prefix}#{get_filename(headers[i])}", :file => file}
    i += 1
  end
  result
end

#get_single_file_diff(file_name, diff_file) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 86

def get_single_file_diff(file_name, diff_file)
  @last_op = ' '
  @left = []
  @right = []

  result = ""

  diff = diff_file.split("\n")
  
  diff.shift #index
  line = nil
  while line !~ /^---/ && !diff.empty?
    line = diff.shift
  end
  header_old = line
  if line =~ /^---/
    diff.shift #+++
    
    result << begin_file(file_name)
    range = diff.shift
    left_ln, right_ln = range_info(range)
    result << range_row(range)
    
    diff.each do |line|
      op = line[0,1]
      line = line[1..-1] || ''
      if op == '\\'
        line = op + line
        op = ' '
      end
      
      if ((@last_op != ' ' and op == ' ') or (@last_op == ' ' and op != ' '))
        left_ln, right_ln = flush_changes(result, left_ln, right_ln)
      end
      
      # truncate and escape
      line = CGI.escapeHTML(line)

      case op
      when ' '
        @left.push(line)
        @right.push(line)
      when '-' then @left.push(line)
      when '+' then @right.push(line)
      when '@' 
        range = '@' + line
        flush_changes(result, left_ln, right_ln)
        left_ln, right_ln = range_info(range)
        result << range_row(range)
      else
        flush_changes(result, left_ln, right_ln)
        result << "</table></li>"
        break
      end
      @last_op = op
    end

    flush_changes(result, left_ln, right_ln)
    result << "</table></li>"      
  else
    #"<div class='error'>#{header_old}</div>"
    result =%Q{<li><h2><a name="F#{@filenum}" href="#F#{@filenum}">#{file_name}</a></h2>#{header_old}</li>}
  end

  result
end

#ln_cell(ln, side = nil) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 7

def ln_cell(ln, side = nil)
  anchor = "f#{@filenum}#{side}#{ln}"
  result = "<td class = 'ln'>"
  result += "<a name='#{anchor}' href='##{anchor}'>" if ln
  result += "#{ln}"
  result += "</a>" if ln
  result += "</td>"
  result
end

#range_info(range) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 59

def range_info(range)
  range.match(/^@@ \-(\d+),\d+ \+(\d+),\d+ @@/)
  left_ln = Integer($1)
  right_ln = Integer($2)
  return left_ln, right_ln
end

#range_row(range) ⇒ Object 



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# File 'lib/diff_to_html.rb', line 55

def range_row(range)
  "<tr class='range'><td>...</td<td>...</td><td>#{range}</td></tr>"
end