# -*- coding: utf-8 -*-

import re

_INDENT = r"(?P<indent>^ *)"
_INDENT_MATCH = r"(?P=indent)"
_VAR = r"(?P<variable>.+?)\s*:"
_VALUE = r"(?P<value>(?:(?P<q2>['\"]).*?(?P=q2))|[^#]+?)"
_STR_VALUE = r"((?:(?P<q2>['\"]).*?(?P=q2))|[^#]+?)"
_NEWLINE = r"$\n"
_OPT_NEWLINE = r"$\n?"
_BLANK = r" +"
_INLINE_COMMENT = r"(?: +#.*)?"

_COMMENT = r"^ *#.*" + _NEWLINE
_BLANK_LINE = r"^[ \t]*" + _NEWLINE
_DASHES = r"^---" + _NEWLINE

_SECTION = _INDENT + _VAR + _INLINE_COMMENT + _NEWLINE
_SIMPLE = _INDENT + _VAR + _BLANK + _VALUE + _INLINE_COMMENT + _OPT_NEWLINE

_MULTILINE = (
    _INDENT
    + _VAR
    + _BLANK
    + r"(?P<blockstyle>[>|])(?P<chomping>[+-]?)(?P<forceindent>\d*) *"
    + _INLINE_COMMENT
    + _NEWLINE
)
_MULTILINE_STR = _INDENT_MATCH + _BLANK + _STR_VALUE + _NEWLINE + r"|" + _BLANK_LINE
_MULTILINE_SECTION = _MULTILINE + r"(?P<lines>(?:" + _MULTILINE_STR + r")*" + r")"

_LIST_VALUE = (
    _BLANK
    + r"-"
    + _BLANK
    + r"('.*?'|\".*?\"|[^#\n]+?)"
    + _INLINE_COMMENT
    + _OPT_NEWLINE
)
_LIST_ITEM = _BLANK_LINE + r"|" + _COMMENT + r"|" + _LIST_VALUE

_LIST = _SECTION + r"(?P<items>(?:" + _LIST_ITEM + r")*" + _LIST_VALUE + r")"

_NULL = r"\b(null|Null|NULL)\b|~"
_TRUE = r"\b(true|True|TRUE)\b"
_FALSE = r"\b(false|False|FALSE)\b"
_INT = r"[-+]?[0-9]+"
_FLOAT = r"([-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?)"
_STR = r"(?P<quotes>['\"]?).*(?P=quotes)"

# basic rules that the parser matches against
COMMENT = re.compile(_COMMENT, re.MULTILINE)
BLANK_LINE = re.compile(_BLANK_LINE, re.MULTILINE)
DASHES = re.compile(_DASHES, re.MULTILINE)
LIST = re.compile(_LIST, re.MULTILINE)
SIMPLE = re.compile(_SIMPLE, re.MULTILINE)
SECTION = re.compile(_SECTION, re.MULTILINE)

# list rule to retrieve all the individual matches of a list match
LIST_ITEM = re.compile(_LIST_VALUE, re.MULTILINE)

# tag rules to detect types of variable names and value
NULL = re.compile(_NULL)
TRUE = re.compile(_TRUE)
FALSE = re.compile(_FALSE)
FLOAT = re.compile(_FLOAT)
INT = re.compile(_INT)
STR = re.compile(_STR)
MULTILINE_STR = re.compile(_MULTILINE_SECTION, re.MULTILINE)