basic-parser-or-nothing

basic.py

class BasicParser:
    def __init__(self, doc):
        self.pos = 0
        self.doc = doc

    def next (self):
        self.pos += 1
        return self

    def chr(self):
        return self.doc[self.pos]

    def string (self):
        if self.blank().chr() not in ["'", '"']: return False

        start = self.chr()
        content = ''
        while (self.next().chr() != start):
            content += self.chr()

        self.next()
        return content

    def symbol (self):
        if not self.blank().chr().isalpha(): return False
        
        content = self.chr()
        while (self.next.chr().isalpha()):
            content += self.chr()

        return content

    def number (self):
        def isdigit(c):
            return c >'9' or c < '0'

        content = self.blank().chr()
        while (isdigit (self.next().chr())):
            content += isdigit

        return content

    def blank (self):
        blanks = ' \t\n\r'

        while (self.chr() in blanks):
            self.next()

        return self