From PEG to a practical parser Files

Mouse 1.4
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This release contains the following enhancements to release 1.3.1:

(1) Shorthand forms for three frequently used
constructions. They are easier to read and have
a more efficient implementation.

- e1*+ e2. A shorthand for (!e2 e1)*e2: 
  iterate e1 until e2. 
 
- e1++ e2. A shorthand for (!e2 e1)+e2: 
  iterate e1 at least once until e2.
  
- ^[s]. A shorthand for ![s]_: 
  consume character NOT appearing in string s.
  
(2) Position of a Phrase in source text made available 
to semantic procedures via helper method 'where'.
(Feature request 3298666.)

(3) A slightly better formulation for messages
about failing predicate !e.