import re
from os.path import abspath, join, dirname
from ..Code import classes, functions, instances
from ..Settings import *

def path(fn):
    return abspath(join(dirname(__file__), fn))

# RegEx Group 1
user_defn = r"(?<=def )(\w+)"
players   = r"(?<=>>)(\s*\w+)"
comments  = r"^\s*#.*"
decorator = r"\A@\S+"
numbers   = r"(?<![a-zA-Z])\d+"
strings   = r"\".*?\"|\".*" + "|\'.*?\'|\'.*"
dollar    = r"\s\$\s?"
arrow     = r"\s>>\s?"

# RegEx Group 2
def re_list(string, br="[]"):
    new = ""
    nested = False
    n, m = 0, 0
    while n < len(string):
        char = string[n]
        if char == br[0]:
            if nested is False:
                nested = True
                m = n
                n += 1
            else:
                value = re_list(string[n + 1:])
                n += len(value) + 1
        elif char == br[1]:
            return string[m:n+1]
        else:
            n += 1

def re_pat(string):
    r = r"P?" + re_list(string)
    for char in "[]()":
        r = r.replace(char,"\\" + char)
    return re.search(r, string)

def findstyles(line, *args):
    """ Finds any locations of any regex and returns the name
        of the style and the start and end point in the line """

    if not args:

        tags = re_patterns

    else:

        tags = [a for a in args if a in re_patterns]

    pos = []

    for tag in tags:

        for match in re.finditer(re_patterns[tag], line):

            pos.append((tag, match.start(), match.end()))

    return pos

def userdefined(line):
    """ Returns the name of a user defined function or class in a string
        i.e. def foo(x) -> foo """

    match = re.search(user_defn, line)

    if match:

        return match.group()
    

# Use our regex to read patterns.py and add all the functions to key_types
    
from ..Patterns import Sequences
from ..SCLang import SCLang

foxdot_kw = ["Clock","Group","Scale","Server","Root","BufferManager","var","Pvar","linvar","inf","lambda", decorator]

foxdot_funcs = functions(Sequences) + ["P", "PRand"] # TODO PatternGenerator 

# Python keywords used in RegEx Group 2

py_indent_kw = ["for","if","elif","else","def","while","class","try","except","when"]

py_functions = ["if","elif","else","return","def","print","when","from",
                 "and","or","not","is","in","for","as","with",
                 "while", "class", "import", "try","except","from"]

py_other_kws = foxdot_kw + ["True", "False", "None", "self"]

py_key_types = ["abs","divmod","input","open","staticmethod","all","enumerate","int",
                "ord","str","any","eval","isinstance", "pow","sum","basestring",
                "execfile","issubclass","super","bin","file","iter","property","tuple",
                "bool", "filter","len","range","type","bytearray","float","list",
                "raw_input","unichr","callable","format","locals","reduce","unicode",
                "chr","frozenset","long","reload","vars","classmethod","getattr","map",
                "repr","xrange","cmp","globals","max","reversed","zip","compile","hasattr",
                "memoryview","round","__import__","complex","hash","min","delattr","set",
                "help","next","setattr","dict","hex","object","slice","dir","id","sorted"]

py_key_types = foxdot_funcs + py_key_types

py_separators = list("[](){},./*+=- \t\n")
py_whitespace = list(" \t\n\r\f\v")

left_b = list("([{'\"")
right_b = list(")]}'\"")
brackets = dict([(right_b[i],left_b[i]) for i in range(3)])
tabsize = 4

# RegEx Group 2

functions = r"(?<![a-zA-Z.])(" + "|".join(py_functions) + ")(?![a-zA-Z])"
key_types = r"(?<![a-zA-Z.])(" + "|".join(py_key_types) + ")(?![a-zA-Z])"
other_kws = r"(?<![a-zA-Z.])(" + "|".join(py_other_kws) + ")(?![a-zA-Z])"

colour_map = {'plaintext'  : COLOURS.plaintext,
              'background' : COLOURS.background,
              'functions'  : COLOURS.functions,
              'key_types'  : COLOURS.key_types,
              'user_defn'  : COLOURS.user_defn,
              'other_kws'  : COLOURS.other_kws,
              'comments'   : COLOURS.comments,
              'numbers'    : COLOURS.numbers,
              'strings'    : COLOURS.strings,
              'dollar'     : COLOURS.dollar,
              'arrow'      : COLOURS.arrow,
              'players'    : COLOURS.players}

re_patterns = {  'functions' : functions,
                 'key_types' : key_types,
                 'user_defn' : user_defn,
                 'other_kws' : other_kws,
                 'comments'  : comments,
                 'numbers'   : numbers,
                 'strings'   : strings,
                 'dollar'    : dollar,
                 'arrow'     : arrow,
                 'players'   : players }


# Weightings (heavier get checked last)

tag_weights = [['numbers'],
               ['key_types','functions','user_defn','other_kws','dollar','arrow','players'],
               ['strings'],
               ['comments']]
