Class: RSpec::Core::Formatters::SnippetExtractor Private

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec/core/formatters/snippet_extractor.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Extracts code snippets by looking at the backtrace of the passed error and applies synax highlighting and line numbers using html.

Defined Under Namespace

Classes: NullConverter

Instance Method Summary collapse

Instance Method Details

#lines_around(file, line) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Extract lines of code centered around a particular line within a source file.

Parameters:

  • file (String) —

    filename

  • line (Fixnum) —

    line number

Returns:

  • (String) —

    lines around the target line within the file (2 above and 1 below).



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# File 'lib/rspec/core/formatters/snippet_extractor.rb', line 57

def lines_around(file, line)
  if File.file?(file)
    lines = File.read(file).split("\n")
    min = [0, line-3].max
    max = [line+1, lines.length-1].min
    selected_lines = []
    selected_lines.join("\n")
    lines[min..max].join("\n")
  else
    "# Couldn't get snippet for #{file}"
  end
rescue SecurityError
  "# Couldn't get snippet for #{file}"
end

#post_process(highlighted, offending_line) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Adds line numbers to all lines and highlights the line where the failure occurred using html span tags.

Parameters:

  • highlighted (String) —

    syntax-highlighted snippet surrounding the offending line of code

  • offending_line (Fixnum) —

    line where failure occured

Returns:

  • (String) —

    completed snippet



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# File 'lib/rspec/core/formatters/snippet_extractor.rb', line 79

def post_process(highlighted, offending_line)
  new_lines = []
  highlighted.split("\n").each_with_index do |line, i|
    new_line = "<span class=\"linenum\">#{offending_line+i-2}</span>#{line}"
    new_line = "<span class=\"offending\">#{new_line}</span>" if i == 2
    new_lines << new_line
  end
  new_lines.join("\n")
end

#snippet(backtrace) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Extract lines of code corresponding to a backtrace.

Parameters:

  • backtrace (String) —

    the backtrace from a test failure

Returns:

  • (String) —

    highlighted code snippet indicating where the test failure occured

See Also:



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# File 'lib/rspec/core/formatters/snippet_extractor.rb', line 25

def snippet(backtrace)
  raw_code, line = snippet_for(backtrace[0])
  highlighted = @@converter.convert(raw_code, false)
  highlighted << "\n<span class=\"comment\"># gem install syntax to get syntax highlighting</span>" if @@converter.is_a?(NullConverter)
  post_process(highlighted, line)
end

#snippet_for(error_line) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Create a snippet from a line of code.

Parameters:

  • error_line (String) —

    file name with line number (i.e. 'foo_spec.rb:12')

Returns:

  • (String) —

    lines around the target line within the file

See Also:



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# File 'lib/rspec/core/formatters/snippet_extractor.rb', line 40

def snippet_for(error_line)
  if error_line =~ /(.*):(\d+)/
    file = $1
    line = $2.to_i
    [lines_around(file, line), line]
  else
    ["# Couldn't get snippet for #{error_line}", 1]
  end
end