Python中使用keyword内置模块来获取当前Python版本的所有关键字的列表,并且执行keyword.kwlist列表中的__peg_parser__关键字时,报错:SyntaxError: You found it!。本文主要简单介绍一下__peg_parser__。 1、PEG 语法解释器 :https://www.python.org/dev/peps/pep-0617/
A Parsing Expression Grammar ( hence peg) is a way to create grammars similar in principle to regular expressions but which allow better code integration. Specifically, peg is an implementation of the Packrat parser generator originally implemented as peg/leg by Ian Piumarta in C. A Packrat ...
Parsimonious aims to be the fastest arbitrary-lookahead parser written in pure Python—and the most usable. It's based on parsing expression grammars (PEGs), which means you feed it a simplified sort of EBNF notation. Parsimonious was designed to undergird a MediaWiki parser that wouldn't take...
RunningtsPEGon this input and testing the parser in node we can see that the parser result has saved the left and right numbers of our sum. Note that we didn't have to assign the result of the[0-9]+rule in thenumrule. This is because rules that are just references to other rules ...
随着Emacs 30.1 的发布,peg.el 也正式内置到了 Emacs 中,可以用它来编写一些简单的 Parser,做一些字符串处理工作。目前能找到的 peg.el 资料相当少,只能阅读源代码中的注释或 info 文档相关章节来学习用法,info 文档似乎还有那么一点小问题。在完善 ox-w3ctr Org 导出后端的过程中我发现可以使用 peg.el 做一些...
Using the Parser in Your Application The parser has been written in ANSI/ISO C89 with GNU extensions, which means that you need a GCC-compatible compiler(see section on MSVC below, though). You also need Bourne Shelland some common Unix utilities due to a utility shell script that is used...
This program is written in portable ANSI C. It requiresglib2. Most *nix systems will have this installed already. The build system requires GNU make. The other required dependency,Ian Piumarta's peg/leg PEG parser generator, is included in the source directory. It will be built automatically...
File"<stdin>", line1,in<module>NameError:name'__peg_parser__'isnotdefined Python 3.9: >>> __peg_parser__File"<stdin>", line1__peg_parser__^SyntaxError:You found it! Python 3.10: >>> __peg_parser__Traceback (most recent call last): ...
As a demo: generate a Python parser from data/python.gram, and use the generated parser to parse and run tests/demo.py make demo How to contribute See the instructions in theCONTRIBUTING.mdfile. Differences with CPython's Pegen This repository exists to distribute a version of the Python ...
[0-9]+ { return strconv.Atoi(string(c.text)) } _ "whitespace" <- [ \n\t\r]* EOF <- !. The generated parser can parse simple arithmetic operations, e.g.:18 + 3 - 27 * (-18 / -3) => -141 More examples can be found in the examples subdirectory....