Initialize library

.editorconfig

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+root = true
+
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+/docs/
+/lib/
+/bin/
+/.shards/
+*.dwarf
+
+# Libraries don't need dependency lock
+# Dependencies will be locked in applications that use them
+/shard.lock

.travis.yml

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+language: crystal
+
+# Uncomment the following if you'd like Travis to run specs and check code formatting
+# script:
+#   - crystal spec
+#   - crystal tool format --check

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2020 Alberto Restifo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# CBOR
+
+This library implements the [RFC7049: Concise Binary Object Representation (CBOR)][rfc]
+in Crystal.
+
+## Installation
+
+1. Add the dependency to your `shard.yml`:
+
+   ```yaml
+   dependencies:
+     cbor:
+       github: your-github-user/cbor
+   ```
+
+2. Run `shards install`
+
+## Usage
+
+```crystal
+require "cbor"
+```
+
+TODO: Write usage instructions here
+
+## Development
+
+TODO: Write development instructions here
+
+## Contributing
+
+1. Fork it (<https://github.com/your-github-user/cbor/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
+
+- [Alberto Restifo](https://github.com/your-github-user) - creator and maintainer
+
+[rfc]: https://tools.ietf.org/html/rfc7049

shard.yml

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+name: cbor
+version: 0.1.0
+
+authors:
+  - Alberto Restifo <alberto@restifo.dev>
+
+crystal: 0.34.0
+
+license: MIT

spec/cbor_spec.cr

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+require "./spec_helper"
+
+describe CBOR do
+  # TODO: Write tests
+
+  it "works" do
+    false.should eq(true)
+  end
+end

spec/spec_helper.cr

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+require "spec"
+require "../src/cbor"

src/cbor.cr

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+require "./cbor/**"
+
+# TODO: Write documentation for `CBOR`
+module CBOR
+  VERSION = "0.1.0"
+
+  # TODO: Put your code here
+end

src/cbor/lexer.cr

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+require "./token"
+
+class CBOR::Lexer
+  @current_byte : UInt8
+
+  def initialize(@io : IO)
+    @current_byte = 0x0
+  end
+
+  def next_token : Token?
+    byte = @io.read_byte
+    return nil if byte.nil?
+
+    @current_byte = byte
+
+    # See: RFC7049 Appedix B
+    case @current_byte
+    when .<= 0x17
+      Token.new(kind: Token::Kind::UInt, value: @curren_byte)
+    when 0x18
+      read_uint8
+    end
+  end
+
+  private def read_uint8
+    byte = @io.read_byte
+    return unexpect_eof if byte.nil?
+
+    Token.new(kind: Token::Kind::UInt, value: byte)
+  end
+
+  private def unexpected_eof
+    raise "Unexpected EOF"
+  end
+end

src/cbor/token.cr

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+class CBOR::Token(T)
+  enum Kind
+    UInt8
+    NInt
+    Byte
+    Text
+    Array
+    Map
+    Float
+  end
+
+  def initialize(@value : T, @kind : Kind)
+  end
+end