AdaYaml - YAML 1.3 implementation in Ada

This is an implementation of the upcoming YAML 1.3 standard. This library is currently under construction. Be wary of errors, I have not even proven it correct.

Status

Current YAML test suite status:

Total Tests Run:   224
Successful Tests:  224
Failed Assertions: 0
Unexpected Errors: 0

YAML 1.3 Features

Status of YAML 1.3 features, taken from this list:

Number	Desciption	Status
RFC-001	Remove the 1024 character limit	Implemented
RFC-002	Limit content allowed after the '---' header	Implemented
RFC-003	Characters that can appear in anchor	Implemented
RFC-004	Block sequence entries must use space after dash	Implemented
RFC-005	Restrict default implicit types to JSON semantics	Not applicable
RFC-006	Disallow carriage return as a break	Implemented
RFC-007	Disallow flow collections as implicit keys	Implemented
RFC-008	Annotations	Can be parsed
RFC-009	Allow unresolvable aliases	Implemented
RFC-010	Fixed position of properties and block scalars	Implemented
RFC-011	Indentation of block scalars	Implemented
RFC-012	Remove wiki-like syntax from folded block scalars	Implemented
RFC-013	retracted	Not implemented
RFC-014	Anchors always come before tags (when both)	Not implemented

General Roadmap

• Have a basic working lexer
• Have a basic working parser
• Have a basic working representer
• Test against the YAML test suite
• Implement fancy error reporting (starting line of error with marker)
• Do some benchmarks
• Web demo
• Implement UTF-16 and UTF-32 encodings
• Make AdaYaml a drop-in replacement for libyaml (provide the C interface)
• As proof-of-concept, implement the Transformations extension
• Maybe provide a DOM API

Hacking

After cloning, to fetch the yaml test suite, do:

git submodule init
git submodule update

For updating the test suite, always use

git submodule update --remote

These commands may be useful for toying around:

make adayaml

This builds the library. Not really useful right now.

make test

This builds the unit tests. The executables will be located in the test/bin directory (be sure that the root folder is the working directory when executing).

make utils

This builds a small utility that reads a YAML files and outputs a stream of events to the command line. It is located in util/bin afterwards. The tool reads either the file specified as first command line parameter, or, in absense of that parameter, from stdin.

To edit the code, you can use GNAT Programming Studio to open the *.gpr files.

License

MIT