Class: Ruumba::Parser

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

Overview

Responsible for extracting interpolated Ruby.

Constant Summary collapse

ERB_REGEX =

The regular expression to capture interpolated Ruby.

/<%[-=]?(.*?)-?%>/m.freeze

Instance Method Summary collapse

Constructor Details

#initialize(region_start_marker = nil) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/ruumba/parser.rb', line 11

def initialize(region_start_marker = nil)
  @region_start_marker = region_start_marker
end

Instance Method Details

#extract(contents) ⇒ String

Extracts Ruby code from an ERB template.

Returns:

  • (String) —

    The extracted ruby code



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# File 'lib/ruumba/parser.rb', line 17

def extract(contents)
  file_text, matches = parse(contents)

  extracted_ruby = +''

  last_match = [0, 0]
  matches.each_with_index do |(start_index, end_index), index|
    handle_region_before(start_index, last_match.last, file_text, extracted_ruby)

    match_marker = "#{region_start_marker}_#{format('%010d', index + 1)}" if region_start_marker
    extracted_ruby << extract_match(file_text, start_index, end_index, match_marker)

    last_match = [start_index, end_index]
  end

  extracted_ruby << file_text[last_match.last..-1].gsub(/./, ' ')

  # if we replaced <%== with <%= raw, try to shift the columns back to the
  # left so they match the original again
  extracted_ruby.gsub!(/   raw/, 'raw')

  extracted_ruby
end

#replace(old_contents, new_contents) ⇒ Object 



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# File 'lib/ruumba/parser.rb', line 41

def replace(old_contents, new_contents)
  file_text, matches = parse(old_contents)

  auto_corrected_erb = +''

  last_match = [0, 0]
  matches.each_with_index do |(start_index, end_index), index|
    match_start = start_index
    prev_end_index = last_match.last

    if start_index > prev_end_index
      region_before = file_text[prev_end_index..match_start - 1]

      auto_corrected_erb << region_before
    end

    suffix = format('%010d', index + 1)
    match_marker = "#{region_start_marker}_#{suffix}"

    match_without_markers = new_contents[/\n#{match_marker}$\n(.*)\n#{match_marker}\n/m, 1]

    # auto-correct is still experimental and can cause invalid ruby to be generated when extracting ruby from ERBs
    return nil unless match_without_markers

    auto_corrected_erb << match_without_markers

    last_match = [start_index, end_index]
  end

  auto_corrected_erb << file_text[last_match.last..-1]

  auto_corrected_erb
end