Use OpenJDK's Java parser ("javac") in Python!

pip install javac-parser

First, instantiate the server:

import javac_parser
java = javac_parser.Java()

Count the number of syntax errors:

>>> java.get_num_parse_errors('class Hello {')
1
>>> java.get_num_parse_errors('class Hello { }')
0

Get a list of diagnostics for each syntax error:

>>> java.check_syntax('class Hello {')
[('ERROR', 'compiler.err.premature.eof', 'reached end of file while parsing', 1, 14, 13, 13)]'
>>> java.check_syntax('class Hello { }')
[]

Lex (tokenize) Java source code, even if it does not compile:

>>> java.lex('class Hello {')
[('CLASS', 'class', (1, 0), (1, 5), 'class'), ('IDENTIFIER', 'Hello', (1, 6), (1, 11), 'Hello'), ('LBRACE', '{', (1, 12), (1, 13), '{'), ('EOF', '', (1, 13), (1, 13), 'token.end-of-input')]

See the docstrings in javac_parser.py or type pydoc javac_parser for more details!

Copyright (C) 2017, 2018 Joshua Charles Campbell and Eddie Antonio Santos

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.