Chordpro Parser

An attempt to rewrite chordproko gem in C++. It should be portable to any device that can run or compile this project.

This program outputs XML or YML files.

Ruby Gem

A wrapper ruby gem will follow after a working prototype or release candidate is published and soon will be utilized in an existing chordproko gem.

Setup

There's nothing in it yet. Run this command to try it out.

make build-and-run

The program

Lexical Analyzer

The input of this anaylzer is a the raw .chordpro file. It will just (for now) out put on your screen a breakdown of tokens of the said file. Example

Input:

{title: Back to me}
[E]Can you feel me
[C#m]See me falling a[F#m-B]way(see me falling away)

Output:

[Dir  ]:   {title: Back to me}
[Chord]:   [E]
[Lyric]:   Can you feel me
[Chord]:   [C#m]
[Lyric]:   See me falling a
[Chord]:   [F#m-B]
[Lyric]:   way(see me falling away)

Syntax analyzer

Our syntax analyzer consumes a lexical analyzer object and returns a structured data. I don't know yet how will I structure the result of this analyzer. The data should be passed to a Translator or to a Code Generator. You can read more here.

Our goal

This program should produce a yml file similar to this.

song:
  directive:
    title: Back to me
  line:
    chord:
      E
    lyric:
      Can you feel me
    chord:
      note:
        C#
      quality:
        m
      add:
        7
  line:
    chord:
      C#m
    lyric:
      See me falling a
    chord:
      F#m
    chord:
      B
    lyric:
      way(see me falling away)

This generated YML is then consumed by Chordpro formatters to layout a readable song sheet. (We will design a formatter someday with ruby, java, c++ and others)

TODOs

• Lexical Analyzer
  • Classify
  • On demand execution
• Syntax Analyzer
• Intermediate Code Generation or maybe not.
• Tests