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Since YAML has a rather complicated syntax, is it possible to write a parser for YAML mainly using ANTLR4 ? I was looking for examples, that implement the YAML like indentation parsing and the detection of data types.
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XML, JSON, and YAML generally fall under context-free or context-sensitive languages depending on how they're used.
A language is specified using a context-free grammar expressed using Extended Backus–Naur Form (EBNF). ANTLR can generate lexers, parsers, tree parsers, and combined lexer-parsers.
What is ANTLR? ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.
The Symfony Yaml component parses YAML strings to convert them to PHP arrays. It is also able to convert PHP arrays to YAML strings. YAML, YAML Ain't Markup Language, is a human friendly data serialization standard for all programming languages. YAML is a great format for your configuration files.
The YAML specification contains a BNF grammar. Bear in mind that according to this document, fully correct YAML is context-sensitive and not parseable by parser-generators, so your grammar will have to describe a context-free superset.
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