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Easy and Safe popping from one type to another.
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shard.yml

README.md

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Popcorn

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Easy and Safe popping from one type to another. Popcorn icon by HLD from the Noun Project.

Installation

Add this to your application's shard.yml:

dependencies:
  popcorn:
    github: icyleaf/popcorn

Usage

Popcorn is easy and safe from one type to another tool.

Popcorn proviedes a handful of to_xxx/to_xxx? methods and xxx is full type name, This is distinguish between built-in methods in Crystal.

  • to_int8
  • to_int16
  • to_int (alias to to_int32)
  • to_int64
  • to_uint8
  • to_uint16
  • to_uint (alias to to_uint32)
  • to_uint64
  • to_float32
  • to_float64
  • to_bool
  • to_time(location : Time::Location? = nil, formatters : Array(String)? = nil)
  • to_array(target : T.class = String)
  • to_hash(target : T.class = String)
  • to_string (alias to to_s in Crystal).
require "popcorn"

Popcorn.to_sting("foobar")                                                    # => "foobar"
Popcorn.to_string(8.31)                                                       # => "8.31"
Popcorn.to_int("1")                                                           # => 1
Popcorn.to_int("123abc")                                                      # => 123
Popcorn.to_bool("no")                                                         # => false
Popcorn.to_bool("unkown")                                                     # => raise a `TypeCastError` exception
Popcorn.to_bool?("unkown")                                                    # => nil
Popcorn.to_time("2018-07-23T10:11:22")                                        # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location::UTC)
Popcorn.to_time("2018-07-23T10:11:22Z", Time::Location.load("Asia/Shanghai")) # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location.load("Asia/Shanghai"))
Popcorn.to_time("Tue, 20 Jan 2018", formatter: ["%a, %d %b %Y"])              # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location::UTC)

Also these methods had been inject to Crystal literals, you can call it directly, Monkey Patching list:

  • String
  • Int
  • Float
  • Bool
  • Time
  • Symbol
  • NamedTupe
  • Array
  • Hash
  • Nil
  • JSON::Any
  • YAML::Any
require "popcorn"
require "popcorn/injection" # => make sure require it!

"foobar".to_string                                                   # => "foobar"
8.31.to_string                                                       # => "8.31"
"1".to_int                                                           # => 1
"123abc".to_int                                                      # => 123
"no".to_bool                                                         # => false
"unkown".to_bool                                                     # => raise a `TypeCastError` exception
"unkown".to_bool?                                                    # => nil
"2018-07-23T10:11:22".to_time                                        # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location::UTC)
"2018-07-23T10:11:22Z".to_time(Time::Location.load("Asia/Shanghai")) # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location.load("Asia/Shanghai"))
"Tue, 20 Jan 2018".to_time(formatter: ["%a, %d %b %Y"])              # => Time.new(2018, 7, 23, 10, 11, 22, location: Time::Location::UTC)

Casting unmatch class

By desgin in Crystal, we can not match type with T(no override by alone type) and no time to match each shard type. so you can write your own.

Reference at totem.

Contributing

  1. Fork it (https://github.com/icyleaf/popcorn/fork)
  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 a new Pull Request

Contributors

  • icyleaf icyleaf - creator, maintainer

You may also like

  • halite - Crystal HTTP Requests Client with a chainable REST API, built-in sessions and middlewares.
  • totem - Load and parse a configuration file or string in JSON, YAML, dotenv formats.
  • poncho - A .env parser/loader improved for performance.
  • fast-crystal - 💨 Writing Fast Crystal 😍 -- Collect Common Crystal idioms.
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