wqweto / vbpeg Goto Github PK

Generate code with conditional x64 API declares.

The syntax is {min,max}, where min is zero or a positive integer number indicating the minimum number of matches, and max is an integer equal to or greater than min indicating the maximum number of matches. If the comma is present but max is omitted, the maximum number of matches is infinite. So {0,1} is the same as ?, {0,} is the same as *, and {1,} is the same as +. Omitting both the comma and max tells the engine to repeat the token exactly min times.

• Use expr*<n,m> instead of curly braces

• Defined with binexpr(ByVal MinPrec As Long) = ...
• Arguments has to be supplied from referencing site expr = binexpr(0)
• Params are available in
  • Predicates in current rule &{ GetBinopPrec($$text) >= MinPrec }
  • Arguments to other param rules binop(ByVal MinPrec As Long) = ... | unexpr(MinPrec)

• memoize
• inline
• public

• Parsing expressions by precedence climbing

• VbPeg runtime - class for memoization table
• Incremental Packrat Parsing

• Defined with ListOf<elem, delim> = elem (delim elem)*
• Can be invoked with ListOf<ID, ','> or List<id:ID { .AddIdent($id) }, ','>
• Invokations resolved after parse tree generation by inlining (with param replacement)
• Hint: TOKEN<> can be used to force inline if usage TOKEN without <> supported
• Can be overloaded on number of params e.g. ListOf@1 vs ListOf@2
• Can be used to implement Error<msg> or Warning<msg>