pmacs3/mode/hex.py

import string
import color, mode2
from lex3 import Grammar, PatternRule, RegionRule
from method import Method, Argument
from point2 import Point

class HexGrammar(Grammar):
    rules = [
        PatternRule(r'zero', r"00"),
        PatternRule(r'byte', r'[0-f][0-f]'),
    ]

class Hex(mode2.Fundamental):
    grammar = HexGrammar
    colors = {
        'zero':      ('magenta', 'default'),
        'byte':      ('white', 'default'),
    }
    def __init__(self, w):
        mode2.Fundamental.__init__(self, w)

        self.add_action_and_bindings(GotoWord(), ('M-g',))

        # create all the insert actions for the basic text input
        for c in string.letters + string.digits + string.punctuation:
            if c in string.hexdigits:
                self.add_binding('overwrite-char-%s' % c.lower(), c)
            else:
                self.del_binding(c)

    def name(self):
        return "Hex"

class GotoWord(Method):
    '''Jump to the specified line number'''
    args = [Argument("wordno", type=type(0), prompt="Goto word: ")]
    def _execute(self, w, **vargs):
        n = vargs["wordno"]
        if n < 0:
            w.set_error("Negative word counts not supported.")
        try:
            p = Point((n % 4) * 9, n / 4)
            w.goto(p)
        except:
            w.goto_end()