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David Majda 6ce97457bf Fix left recursion detection 
So far, left recursion detector assumed that left recursion occurs only
when the recursive rule is at the very left-hand side of rule's
expression:

  start = start

This didn't catch cases like this:

  start = "a"? start

In general, if a rule reference can be reached without consuming any
input, it can lead to left recursion. This commit fixes the detector to
consider that.

Fixes #190.
 		10 years ago
..
compiler Fix left recursion detection 10 years ago
utils Fix left recursion detection 10 years ago
compiler.js Implement basic support for tracing 10 years ago
grammar-error.js Utility functions cleanup: Split lib/utils.js 11 years ago
parser.js Update website URL 10 years ago
peg.js Utility functions cleanup: Split lib/utils.js 11 years ago