parsing tree

hello my luft ballons
[(“word-element”, “hello”),
(“word-element”,”my”),
(“javascript-element”), “document.write(99);”)
(“word-elment”, “luftballons”),
]

def interpret(trees):
	for tree in trees:
		treetype = tree[0]
		if treetype == "word-element":
			graphics.word(node[1])
		elif treetype == "javascript-element":
			jstext = tree[1]
			jslexer = lex.lex(module=jstokens)
			jsparser = yacc.yacc(module=jsgrammar)
			jstree = jsparser.parse(jstext,lexer=jslexer)
			result = jsinterp.interpret( jstree )
			graphics.word( result )

def env_lookup(vname, env):
	if vname in env[1]:
		return (env[1])[vname]
	elif env[0] == None:
		return None
	else:
		return env_lookup(vname, env[0])

var a = 1;
function mistletue(baldr){
	baldr = baldr + 1;
	a = a + 2;
	baldr = baldr + a;
	return baldr;
}
write (mistletue(5));

def optimize(tree):
	etype = tree[0]
	if etype == "binop":
		a = tree[1]
		op = tree[2]
		b = tree[3]
		if op == "*" and b == ("number","1"):
			return a
		return tree

def remove_html_markup(s):
	tag = False
	out = ""

	for c in s:
		if c == '<':
			tag = True
		elif c == '>':
			tag = False
		elif not tag:
			out = out + c

	return out
print remove_html_markup("<b>foo</b>")