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Current File : /usr/lib/python2.7/site-packages/jmespath/parser.pyc
�
Q�Yc@s�dZddlZddlmZddlmZddlmZddlmZddlmZde	fd	��YZ
ed
e	fd��Y�ZdS(s�Top down operator precedence parser.

This is an implementation of Vaughan R. Pratt's
"Top Down Operator Precedence" parser.
(http://dl.acm.org/citation.cfm?doid=512927.512931).

These are some additional resources that help explain the
general idea behind a Pratt parser:

* http://effbot.org/zone/simple-top-down-parsing.htm
* http://javascript.crockford.com/tdop/tdop.html

A few notes on the implementation.

* All the nud/led tokens are on the Parser class itself, and are dispatched
  using getattr().  This keeps all the parsing logic contained to a single
  class.
* We use two passes through the data.  One to create a list of token,
  then one pass through the tokens to create the AST.  While the lexer actually
  yields tokens, we convert it to a list so we can easily implement two tokens
  of lookahead.  A previous implementation used a fixed circular buffer, but it
  was significantly slower.  Also, the average jmespath expression typically
  does not have a large amount of token so this is not an issue.  And
  interestingly enough, creating a token list first is actually faster than
  consuming from the token iterator one token at a time.

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