import re

# lexing
reserved_token_names = re.compile(r'^(?:rules|null|start|end|middle[0-9]*)$')
valid_token_name     = re.compile(r'^[a-zA-Z_][a-zA-Z0-9_]*$')
middle_token_name    = re.compile(r'^middle([0-9]+)$')

# meta regexes
meta_chars = re.compile(r'([\.\^\$\*\+\?\{\}\(\)\[\]\|\"\'\\,])')

# shell
shell_command = re.compile(r'^[^ ]+')

# whitespace regexes
leading_whitespace = re.compile('^ *')
trailing_whitespace = re.compile(' *$')
whitespace = re.compile('^[ \n]*$')
space = re.compile('^ *$')
leading_whitespace2 = re.compile('^( *?)(.*?)\n?$')

# word regexes
word = re.compile('^[A-Za-z0-9_]+$')
word_char = re.compile('^[A-Za-z0-9_]$')

# perl regexes
perl_base = re.compile("^sub ")
perl_hash_cleanup = re.compile(r"^( *)([^ ]+|'(?:\.|[^'\'])*'|\"(?:\.|[^\\\"]*)\")( *)(=>)( *)([^ ].*)$")
perl_assign_cleanup = re.compile(r"^( *)((?:my |our )?[^ ]+)( *)(=(?!>))( *)([^ ].*)$")
perl_function = re.compile(r"^ *sub ([A-Za-z_][A-Za-z0-9_]*)")

# python regexes
python_base = re.compile(r"^[^ ]")
python_dict_cleanup = re.compile(r"^( *)((?:[^'\":]|'(?:\.|[^\'])*'|\"(?:\.|[^\'])*)+?)( *)(:)( *)([^ ].*)$")
python_assign_cleanup = re.compile(r"^( *)([^ ]+)( *)(=)( *)([^ ].*)$")