Class: Wrong::Chunk

Inherits:
Object show all
Defined in:
lib/wrong/chunk.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, line_number, block = nil) ⇒ Chunk

line parameter is 1-based



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# File 'lib/wrong/chunk.rb', line 22

def initialize(file, line_number, block = nil)
  @file = file
  @line_number = line_number.to_i
  @block = block
end

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/wrong/chunk.rb', line 19

def block
  @block
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/wrong/chunk.rb', line 19

def file
  @file
end

#line_number ⇒ Object (readonly)

Returns the value of attribute line_number.



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# File 'lib/wrong/chunk.rb', line 19

def line_number
  @line_number
end

Class Method Details

.from_block(block, depth = 0) ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 8

def self.from_block(block, depth = 0)
  file, line = if block.to_proc.respond_to? :source_location
                 # in Ruby 1.9, it reads the source location from the block
                 block.to_proc.source_location
               else
                 # in Ruby 1.8, it reads the source location from the call stack
                 caller[depth].split(":")
               end
  new(file, line, block)
end

Instance Method Details

#claim ⇒ Object

The claim is the part of the assertion inside the curly braces. E.g. for “assert { x == 5 }” the claim is “x == 5”



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# File 'lib/wrong/chunk.rb', line 61

def claim
  parse()

  if @sexp.nil?
    raise "Could not parse #{location}"
  else
    assertion = @sexp.assertion
    statement = assertion && assertion[3]
    if statement.nil?
      @sexp
#          raise "Could not find assertion in #{location}\n\t#{@chunk.strip}\n\t#{@sexp}"
    else
      statement
    end
  end
end

#code ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 78

def code
  self.claim.to_ruby
end

#details ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 106

def details
  require "wrong/rainbow" if Wrong.config[:color]
  s = ""
  parts = self.parts
  parts.shift # remove the first part, since it's the same as the code

  details = []

  if parts.size > 0
    parts.each do |part|
      begin
        value = eval(part, block.binding)
        unless part == value.inspect  # this skips literals or tautologies
          if part =~ /\n/m
            part.gsub!(/\n/, newline(2))
            part += newline(3)
          end
          value = indent_all(3, value.inspect)
          if Wrong.config[:color]
            part = part.color(:blue)
            value = value.color(:magenta)
          end
          details << indent(2, part, " is ", value)
        end
      rescue Exception => e
        raises = "raises #{e.class}"
        if Wrong.config[:color]
          part = part.color(:blue)
          raises = raises.bold.color(:red)
        end
        details << indent(2, part, " ", raises, ": ", indent_all(3, e.message))
      end
    end
  end

  details.uniq!
  if details.empty?
    ""
  else
    "\n" + details.join("\n") + "\n"
  end
  
end

#line_index ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 28

def line_index
  @line_number - 1
end

#location ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 32

def location
  "#{@file}:#{@line_number}"
end

#parse ⇒ Object

Algorithm: try to parse the starting line if it parses OK, then we’re done! if not, then glom the next line and try again repeat until it parses or we’re out of lines



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# File 'lib/wrong/chunk.rb', line 41

def parse
  lines = File.read(@file).split("\n")
  @parser ||= RubyParser.new
  @chunk = nil
  c = 0
  @sexp = nil
  while @sexp.nil? && line_index + c < lines.size
    begin
      @chunk = lines[line_index..line_index+c].join("\n")
      @sexp = @parser.parse(@chunk)
    rescue Racc::ParseError => e
      # loop and try again
      c += 1
    end
  end
  @sexp
end

#parts(sexp = nil) ⇒ Object 



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# File 'lib/wrong/chunk.rb', line 82

def parts(sexp = nil)
  if sexp.nil?
    parts(self.claim).compact.uniq
  else
    # todo: extract some of this into Sexp
    parts_list = []
    begin
      unless sexp.first == :arglist
        code = sexp.to_ruby.strip
        parts_list << code unless code == "" || parts_list.include?(code)
      end
    rescue => e
      puts "#{e.class}: #{e.message}"
      puts e.backtrace.join("\n")
    end
    sexp.each do |sub|
      if sub.is_a?(Sexp)
        parts_list += parts(sub)
      end
    end
    parts_list
  end
end