preserving whitespace

[Enrique Pérez]

I am writing a parser for a grammar, and I want to allow Python sections (delimitd by '\n<-\n' and '\n->\n') within code generated from that grammar. I do not want to parse Python; I will feed it to exec. I just want to get the whole lines, including whitespace.

This is in my lexer:

    def t_begin_pycode(self, t):
        r'<-'
        t.lexer.begin('pycode')

    def t_pycode_newline(self, t):
        r'\n+'
        t.lexer.lineno += len(t.value)

    def t_pycode_IMPLIES(self, t):
        r'->'
        t.lexer.begin('INITIAL')
        return t

    def t_pycode_PYCODE(self, t):
        r'.+'
        return t

    t_pycode_ignore  = ''

However, somewhere between this and the parser, the leading whitespace is lost...
What am I doing wrong?

I have looked at the GardenSnake parser by Andrew Dalke but I do not need to parse indentation or distinguish types of whitespace.

[Enrique Pérez Arnaud]

The problem was elsewhere, not in my usage of ply.

Sorry about the noise

2012/10/26 Enrique Pérez <enriqu...@gmail.com>

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Enrique Pérez Arnaud
enriqu...@gmail.com