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"""Regexps to match html elements
"""
import re
attr_name = "[a-zA-Z_:][a-zA-Z0-9:._-]*"
unquoted = "[^\"'=<>`\\x00-\\x20]+"
single_quoted = "'[^']*'"
double_quoted = '"[^"]*"'
attr_value = "(?:" + unquoted + "|" + single_quoted + "|" + double_quoted + ")"
attribute = "(?:\\s+" + attr_name + "(?:\\s*=\\s*" + attr_value + ")?)"
open_tag = "<[A-Za-z][A-Za-z0-9\\-]*" + attribute + "*\\s*\\/?>"
close_tag = "<\\/[A-Za-z][A-Za-z0-9\\-]*\\s*>"
comment = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->"
processing = "<[?][\\s\\S]*?[?]>"
declaration = "<![A-Z]+\\s+[^>]*>"
cdata = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"
HTML_TAG_RE = re.compile(
"^(?:"
+ open_tag
+ "|"
+ close_tag
+ "|"
+ comment
+ "|"
+ processing
+ "|"
+ declaration
+ "|"
+ cdata
+ ")"
)
HTML_OPEN_CLOSE_TAG_STR = "^(?:" + open_tag + "|" + close_tag + ")"
HTML_OPEN_CLOSE_TAG_RE = re.compile(HTML_OPEN_CLOSE_TAG_STR)