futureParser -- forward reference to a parser not defined yet

Synopsis

Usage:

futureParser p
Inputs:
- p, a symbol
Outputs:
- a parser, a parser that will pass its input to the value of the symbol p at that time

This function makes recursive parsers possible.

i1 : p = futureParser q

o1 = p

o1 : Parser

i2 : m = p : charAnalyzer

o2 = m

o2 : FunctionClosure

i3 : q = constParser "abc"

o3 = q

o3 : Parser

i4 : m "abc"

o4 = abc

/usr/share/Macaulay2/Parsing.m2:65:29-65:75: --source code:
futureParser = parserSymbol -> new Parser from (c -> (value parserSymbol) c)