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from re import findall
from ply.lex import lex
class QLLexer:
def __init__(self):
self.__errors = []
self.__lexer = None
@property
def lexer(self):
return self.__lexer
@property
def errors(self):
return self.__errors
def build(self):
self.__lexer = lex(module=self)
def tokenize(self, data):
self.__errors = []
self.lexer.input(data)
token = self.lexer.token()
tokens = [token]
while token:
token = self.lexer.token()
tokens.append(token)
return tokens
tokens = [
'PLUS', 'MINUS', 'TIMES', 'DIVIDE', 'COLON',
'ASSIGN',
'EQUALS', 'NOT_EQUALS',
'LESS_EQUALS', 'LESS_THAN', 'GREATER_EQUALS', 'GREATER_THAN',
'AND', 'OR',
'DOLLAR', 'RUBLE',
'LEFT_BRACE', 'RIGHT_BRACE',
'LEFT_BRACKET', 'RIGHT_BRACKET',
'INTEGER_LITERAL', 'DECIMAL_LITERAL',
'TRUE', 'FALSE',
'DATE_LITERAL',
'STRING_LITERAL',
'IDENTIFIER',
]
reserved_keywords = {
'form': 'FORM',
'if': 'IF',
'not': 'NOT',
# Types
'boolean': 'BOOLEAN',
'date': 'DATE',
'decimal': 'DECIMAL',
'integer': 'INTEGER',
'money': 'MONEY',
'string': 'STRING',
}
tokens += list(reserved_keywords.values())
# Regular expression rules for simple tokens
t_ignore = ' \t'
t_PLUS = r'\+'
t_MINUS = r'-'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_COLON = r':'
t_ASSIGN = r'='
t_LESS_EQUALS = r'<='
t_LESS_THAN = r'<'
t_GREATER_EQUALS = r'>='
t_GREATER_THAN = r'>'
t_EQUALS = r'=='
t_NOT_EQUALS = r'!='
t_AND = r'&&'
t_OR = r'\|\|'
t_DOLLAR = r'\$'
t_RUBLE = r'\₽'
t_LEFT_BRACE = r'\{'
t_RIGHT_BRACE = r'\}'
t_LEFT_BRACKET = r'\('
t_RIGHT_BRACKET = r'\)'
# Literals
@staticmethod
def t_FALSE(token):
r'False'
token.value = False
return token
@staticmethod
def t_TRUE(token):
r'True'
token.value = True
return token
def t_DATE_LITERAL(self, token):
r'date\(\s*\d{1,2}\s*,\s*\d{1,2}\s*,\s*\d{1,4}\s*\)'
try:
token.value = findall(r'\d\d*', token.value)
return token
except SyntaxError:
self.errors.append('Invalid date.')
@staticmethod
def t_DECIMAL_LITERAL(token):
r'\d+[.]\d+'
token.value = token.value
return token
@staticmethod
def t_INTEGER_LITERAL(token):
r'\d+'
token.value = token.value
return token
@staticmethod
def t_STRING_LITERAL(token):
r'\"(.+?)\"'
token.value = token.value[1:-1]
return token
# Other
def t_IDENTIFIER(self, token):
r'[a-z][a-zA-Z_0-9]*'
token.type = self.reserved_keywords.get(token.value, 'IDENTIFIER')
return token
@staticmethod
def t_comment(token):
r'//.*'
pass
@staticmethod
def t_newline(token):
r'\n+'
token.lexer.lineno += len(token.value)
# Error handling
def t_error(self, token):
self.errors.append("Illegal character '%s'" % token.value[0])
token.lexer.skip(1)
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