Incorrect line numbers reported when errors are emitted

[yash-nisar]

Steps to reproduce:

1. Edit line FileCopyrightText: Copyright 2014 Acme Inc in SPDXSimpleTag.tag
2. Navigate to the examples directory.
3. Run the command python parse_tv.py '../data/SPDXSimpleTag.tag'
4. Get output as :

Generating LALR tables
FileCopyrightText must be one of NOASSERTION, NONE or free form text, line: 34
Errors encountered while parsing

[yash-nisar]

I've figured out the cause of the bug.

This occurs due to the method t_text_end in lexers\tagvalue.py. The method body is:

def t_text_end(self, t):
        r'</text>\s*'
        t.type = 'TEXT'
        t.value = t.lexer.lexdata[
            t.lexer.text_start:t.lexer.lexpos].strip()
        t.lexer.lineno += t.value.count('\n')
        t.lexer.begin('INITIAL')
        return t

The line t.value.count('\n') doesn't detect newlines because the earlier line is stripped of whitespaces and newlines.