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import re
import os
def compile(string):
"""Compile a string into a function which fills in correct values."""
# This function will extract all variables and functions from $string
# and convert these to functions. That way, it is much faster to run
# than parse everytime $string.
# we will split the string into sections; a section is either a string
# or a variable.
str, params=format_parse_rec(string.replace("%", "%%"), 0)
ps=merge(params)
func='lambda params: "%s" %% (%s)' % (str.replace('"', '\\"').replace("\n", ""), ps)
return eval(func)
def merge(list):
ret=""
for l in list:
ret="%s%s, "%(ret, l)
return ret[:-2]
func=re.compile('\$[a-z_]+', re.IGNORECASE)
def format_parse_rec(string, start):
"""Compiles a function. Returns [special str, params]."""
match=func.search(string, start)
if not match:
return string[start:], []
ret1="" # string
ret2=[] # params
# set fixed string
ret1+=string[start:match.start()]
name=string[match.start()+1:match.end()]
# here are all functions defined
if name in ['if', 'ifn', 'dirname']:
try:
end=match_bracket(string, string.find("(", match.start()))
except:
end=-1
if end<0:
raise Exception("No matching brackets")
if name=='if' or name=='ifn':
# print if something is true/false
# $if($expr-true, $output)
# $ifn($expr-false, $output)
body=string[match.end():end]
comma=body.find(',')
s1,p1=format_parse_rec(body[1:comma], 0) # get the if-part
s2,p2=format_parse_rec(body[comma+1:-1], 0) # if true!
ret1+="%s"
if name=='if':
ret2.append("('%s' %% (%s) if (%s) else '')"%(s2, merge(p2), merge(p1)))
elif name=='ifn':
ret2.append("('%s' %% (%s) if not(%s) else '')"%(s2, merge(p2), merge(p1)))
elif name=='dirname':
# get the dir of a path
# $dirname(path)
s,p=format_parse_rec(string[match.end()+1:end-1], 0)
ret1+="%s"
ret2.append('os.path.dirname("%s"%%(%s))'%(s, merge(p)))
else:
end=match.end()
# variable
ret1+="%s"
ret2.append('params["%s"]'%(name))
ret=format_parse_rec(string, end)
ret1+=ret[0]
if len(ret[1]):
ret2.extend(ret[1])
return ret1, ret2
def match_bracket(string, start):
"""Returns position of matching bracket."""
assert(string[start:start+1]=="(")
balance=1
start+=1
while balance>0:
if start<=0:
raise Exception("No matching bracket found")
l=string.find("(", start)
r=string.find(")", start)
if l<0:
if r>0: balance-=1
else: return -1
start=r+1
else:
if l<r: balance+=1
elif l>r: balance-=1
start=min(l,r)+1
if balance==0:
return r+1
return max(l,r)+1
def params(song, overwrite={}, ensure={"title":"", "artist":""\
, "album":"", "genre":"", "track":"", "length":"" \
, "date":"", "time":""}):
params={}
for param in ensure:
params[param]=ensure[param]
if song:
for param in song._data:
params[param]=song._data[param]
for param in overwrite:
params[param]=overwrite[param]
return params
#f=compile("$if($date, ($date) )")
#f=compile("a$if($title,$title)b$if($artist,$artist)c")
#f=compile('abc$dirname($title/$artist/$artist$state)ghi')
#print f({'state':'playing', 'title':'martha', 'artist':'waits'})
#f=compile("$artist $if($title, titeltje:$artist, $artist $title!) $album")
#print f({'artist':'artist', 'title':'title', 'album':'album'})
#print format_compile('now $title a $artist two');
#print format_compile('now $state$if($title,$if($artist, yeay$title $artist))check')
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