https://github.com/svernidub/dsl_examples
Simple Ruby DSL demonstration
https://github.com/svernidub/dsl_examples
Last synced: 3 months ago
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Simple Ruby DSL demonstration
- Host: GitHub
- URL: https://github.com/svernidub/dsl_examples
- Owner: svernidub
- License: mit
- Created: 2018-10-18T02:00:31.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2018-10-19T08:33:09.000Z (about 7 years ago)
- Last Synced: 2024-05-28T19:57:52.323Z (over 1 year ago)
- Language: Ruby
- Size: 4.88 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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README
# DslExamples
Simple Ruby DSL examples
## How to build DSL via class methods
Not real DSL exactly, but simple example how to use class methods to build DSL.
Simple
[extention](https://github.com/svernidub/dsl_examples/blob/master/lib/dsl_examples/hexdigest.rb)
that allows to create digest helper for any method.
```ruby
class ClassWithHexDigests
extend Hexdigest
attr_reader :first_name,
:last_name
hexdigest_for :first_name, Digest::MD5
hexdigest_for :last_name, Digest::SHA2
end
obj = ClassWithHexDigests.new('Serhii', 'Vernydub')
cwh.first_name # => "Serhii"
cwh.first_name_hexdigest # => "9ca31108f5130ccdff3bfb598a1d4966"
cwh.last_name # => "Vernydub"
cwh.last_name_hexdigest # => "0c0813b27c693bac5dc97ea8200d221f9a56bb9a9b0459b1cd915901ebb2d425"
```
## How to build DSL via methods and blocks
[Class](https://github.com/svernidub/dsl_examples/blob/master/lib/dsl_examples/html_document.rb)
`HtmlDocument` provides ability to describe HTML documents with DSL.
```ruby
module DslExamples
class MyDocument < HtmlDocument
def body
html do |h|
h.head do |hd|
hd.title text: 'Hello world'
hd.style text: <<-CSS
table, tr, td {
border: 1px solid black
}
CSS
end
h.body do |b|
b.h1 text: 'Hello world'
b.table do |t|
t.thead do |thd|
thd.tr do |tr|
tr.td text: 'Social network'
tr.td text: 'Search engine'
end
end
t.tbody do |tb|
tb.tr do |tr|
tr.td do |td|
td.a text: 'Facebook',
attributes: { href: 'https://facebook.com' }
end
tr.td do |td|
td.a text: 'Google',
attributes: { href: 'https://google.com' }
end
end
end
end
end
end
end
end
end
```
### Improved syntax
[Class](https://github.com/svernidub/dsl_examples/blob/master/lib/dsl_examples/html_pretty_document.rb)
`HtmlPrettyDocument` is copy of `HtmlDocument` but it has one simple but useful improvement.
It allows us not to pass block parameter to every nested HTML-tag.
```ruby
module DslExamples
class MyPrettyDocument < HtmlPrettyDocument
def body
html do
head do
title text: 'Hello world'
style text: <<-CSS
table, tr, td {
border: 1px solid red
}
CSS
end
body do
h1 text: 'Hello world'
table do
thead do
tr do
td text: 'Social network'
td text: 'Search engine'
end
end
tbody do
tr do
td do
a text: 'Facebook',
attributes: { href: 'https://facebook.com' }
end
td do
a text: 'Google',
attributes: { href: 'https://google.com' }
end
end
end
end
end
end
end
end
end
```