On Monday, 14 September 2015 at 08:50:48 UTC, Bastiaan Veelo
wrote:
Understanding the source of FancyPars is challenging because
the core source, example vibe.d application source and
supporting code, as well as generated lexer/parser code are all
contained in the same directory and committed in the repository.
Sorry about that.
The Files that are really interesting are
1. fancy_grammar.d - contains helpers for working with the
FancyParsGrammar Definition.
2. fancy_genPars.d - generates a function which parses the output
form the generated lexer
3. fancy_genLex.d generates the lexer function.
4. fancy_genAST.d - generates the AST
The syntax for the grammar definition is different from Pegged,
and seems to be inspired by D. It supports a hierarchical
structure. It looks powerful, but is undocumented. The example
grammar looks like this:
The Syntax is inspired by D and Pegged.
It is going to be extend though and you should consider it
unstable.
I will document it as it becomes more stable.
Its announced support for left-recursion is interesting, and I
may decide to play a bit further with it. My objective would be
to see if an Extended Pascal to D translating compiler would be
feasible.
TransCompilers are what fancyPars is written for.
please show me a few examples of your pascal gramamr.
might be in pegged or EBNF or something similar.
So I can see if there are idioms I should integrate in fp.
Thanks for the interest.
--
Stefan (Uplink_Coder) Koch
