grammar_rules.py

def query():
	""" <query> ::= "SELECT " <columns> " FROM " <name> <terminal> | "SELECT " <columns> " FROM " <name> " WHERE " <conditionList> <terminal>
	"""
	pass
	
def columns():
	""" <columns> ::= (<name> ", ")+ | "*"

	Accepts:
		- *
		- col_a
		_ col_a, col_b
	"""
	pass
	
def name():
	""" Accepts tokens of type 'name'
	"""
	pass
	
def condition_list():
	""" <conditionList> ::= <condition> <comparator> <condition>

	Accepts:
		- col_a = 20 
		- col_a = 20 AND col_b = 30
		- col_a = 20 OR col_b = col_c
	"""
	pass
		
def comparator():
	""" <comparator> ::= " AND " | " OR "

	Accepts:
		- AND
		- OR
	"""
	pass
	
def condition():
	""" <condition> ::= <name> <operator> <term>

	Accepts:
		- col_a = 20
		- col_a = 20.5
		- col_a = col_b
	"""
	pass
	
def term():
	""" <term> ::= <digit> | <digit> "." <digit> | <name>
	"""
	pass
	
def terminal():
	""" Accepts tokens of type 'terminal'
	"""
	pass
	
def operator():
	""" Accepts tokens of type 'operator'
	"""
	pass