Parxer

Parxer is another parser for xls, xlsx and csv files. But the big plus is that this ruby gem also has a nice DSL to help us with:

• Column mapping.
• File, row, and column/cell validation.
• Column/cell formatting.

Installation

$ gem install parxer

Or add to your Gemfile:

gem "parxer"

bundle install

Usage

Imagine you have an xls file like this:

To parse this file you need to:

1 - Define your Parser using the DSL:

class SuperheroesParser < Parxer::XlsParser
  validate_file(:rows_count, max: 50) # Define file validators

  column(:name, name: "Name") do # Map column names to attributes
    validate(:presence) # Add column validator
    format_with do
      value.upcase # Define custom formatters
    end
  end

  column(:real_name, name: "Real Name")

  column(:super_power, name: "Super Power") do
    validate(:presence)
  end

  column(:publisher, name: "Publisher") do
    validate(:inclusion, in: ["Marvel", "DC"])
  end

  column(:age, name: "Alive") do
    validate(:presence)
    validate(:number)
    format_with(:number, integer: true) # Use Parxer's formatter
  end

  column(:is_alive, name: "Alive", format: :boolean) do
    validate(:presence)
  end

  # Define validators to run after attribute validators
  validate_row(:odd_chars, if_valid: [:name, :real_name]) do
    (row.name + row.real_name).delete(" ").size.odd?
  end

  # Define callbacks
  after_parse_row do
    row.add_attribute(:full_name) # Add attributes dynamically
    row.full_name = "#{row.name} (#{row.real_name})" unless row.errors?
  end
end

2 - Initialize your parser:

parser = SuperheroesParser.new

3 - Use your parser:

result = parser.run("/some_path/superhero.xls"); #=> #<Enumerator: ...>

Now, if you iterate through each row of the enumerator you will get something like this:

As you can see...

1. Attributes like name or is_alive have been formatted.
2. Errors in the rows are accessible through the errors attribute.
3. idx attribute is the row number.
4. the custom full_name attribute was added as a part of the response.

For further information please go to the Wiki

Testing

To run the specs you need to execute, in the root path of the gem, the following command:

bundle exec guard

You need to put all your tests in the /my_gem/spec/ directory.

Publishing

On master/main branch...

1. Change VERSION in lib/parxer/version.rb.
2. Change Unreleased title to current version in CHANGELOG.md.
3. Commit new release. For example: Releasing v0.1.0.
4. Create tag. For example: git tag v0.1.0.
5. Push tag. For example: git push origin v0.1.0.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Credits

Thank you contributors!

Parxer is maintained by platanus.

License

Parxer is © 2017 platanus, spa. It is free software and may be redistributed under the terms specified in the LICENSE file.