pymmd.py

#!/usr/bin/python
#coding: utf-8

globals = {}
exec_snippet_counter = 0

def exec_snippet(ll):
    global globals, exec_snippet_counter
    x = ''
    exec_snippet_counter += 1
    argname = 'argname__%d' % exec_snippet_counter
    for arg in ll['args']:
        if arg['type'] == 'line':
            x += arg['value'] + '\n'
    globals[argname] = x
    exec (ll['name'] + '(%s)' % argname) in globals

root = {'type': 'root', 'name': '', 'args': []}
cl = root
while 1:
    try:
        l = raw_input()
        if l[:6] != '<!--py':
            cl['args'].append({'type': 'line', 'value': l})
            continue
        if l[6] == '\\':
            cl['args'].append({'type': 'command', 'name': l[7:-3].strip(), 'args': []})
            cl = cl['args'][-1]
        elif l[6] == '/':
            cl = root
        elif l[6] == ':':
            defs = '#coding: utf-8\n'
            while 1:
                l = raw_input()
                if l.strip() == '-->':
                    break
                defs += l + '\n'
            exec defs in globals
    except EOFError:
        break
        
for _ in root['args']:
    if _['type'] == 'line':
        print _['value']
    else:
        exec_snippet(_)