Python Lexer.input方法代码示例

# 需要导入模块: from lexer import Lexer [as 别名]
# 或者: from lexer.Lexer import input [as 别名]
def vhdl_unit_name(file):
    """ Given the name of a VHDL file, attempts to find the unit
        (entity or package) name in this file.
        
        If several units are present, the first is returned.
        None is returned if no unit name is found.
    """
    rules = [
        ('--[^\n]*\n',  'COMMENT'),
        ('\n+',         'NEWLINE'),
        ('\w+',         'ID'),
        ('\s+',         'WHITESPACE'),
        ('[^\w\n]+',    'NONE'),
    ]

    lx = Lexer(rules, skip_whitespace=False)
    lx.input(open(file).read())
    
    window = [None, None, None]
    
    try:
        for tok in lx.tokens():
            # Implements a simple sliding window looking for 
            # (entity|package) <name> is
            # as 3 consecutive IDs
            #
            if tok.type == 'ID':
                window = window[1:3] + [tok.val.lower()]
                
                if (    window[0] in ('entity', 'package') and 
                        window[2] == 'is'):
                    return window[1]
    except LexerError, err:
        return None

# 需要导入模块: from lexer import Lexer [as 别名]
# 或者: from lexer.Lexer import input [as 别名]
class TestLexer(unittest.TestCase):
    ''' Test GPTrees scanner
    '''
    def setUp(self):
        self.lexer = Lexer(mode = MODE_EXCEPT) 

    def testError(self):
        ''' Test for invalid character
        '''
        self.lexer.input('$')
        self.assertRaises(GPTreesError, self.lexer.token)

    def testTokens(self):
        ''' Test for some tokens
        '''
        self.lexer.input("Ident ( ) 'string' , --> | ;")
        tokens = 'ID', 'LP', 'RP', 'STRING', 'COMMA', 'IS', 'OR', 'SC'
        for token in tokens:
            self.assertEqual(token, self.lexer.token().type)

# 需要导入模块: from lexer import Lexer [as 别名]
# 或者: from lexer.Lexer import input [as 别名]
class StateLinker(Visitor):
	
	def __init__(self):
		self.visiting_statechart = None
		self.visiting_node = None
		self.lexer = Lexer()
	
	def visit_ClassDiagram(self, class_diagram): 
		for c in class_diagram.classes :
			c.accept(self)

	def visit_Class(self, c):
		if c.statechart:
			c.statechart.accept(self)
		
	def visit_StateChart(self, statechart):
		self.visiting_statechart = statechart
		for node in statechart.basics + statechart.composites:
			node.accept(self)
					 
	def visit_StateChartNode(self, node):
		self.visiting_node = node
		node.enter_action.accept(self)
		node.exit_action.accept(self)
		for transition in node.transitions :
			transition.accept(self)
			
	def visit_StateChartTransition(self, transition):
		try :
			transition.target.accept(self)
		except StateReferenceException as exception :
			raise StateReferenceException("Transition from <" + self.visiting_node.full_name + "> has invalid target. " + exception.message)
		try :
			transition.action.accept(self)
		except StateReferenceException as exception :
			raise StateReferenceException("Transition from <" + self.visiting_node.full_name + "> has invalid action. " + exception.message)
		try :
			if transition.guard :
				transition.guard.accept(self)
		except StateReferenceException as exception :
			raise StateReferenceException("Transition from <" + self.visiting_node.full_name  + "> has invalid guard. " + exception.message)
		
	def visit_StateReference(self, state_reference):
		state_reference.target_nodes = []
		
		current_node = None #Will be used to find the target state(s)
		split_stack = [] #used for branching

		self.lexer.input(state_reference.path_string)

		for token in self.lexer.tokens() :
			
			if current_node == None : #current_node is not set yet or has been reset, the CHILD token can now have a special meaning
				if token.type == TokenType.SLASH :
					#Root detected
					current_node = self.visiting_statechart.root
					#Token consumed so continue
					continue
				else :
					current_node = self.visiting_node
					
			if token.type == TokenType.DOT :
				#Advance to next token
				token = self.lexer.nextToken()
				
				if token is None or token.type == TokenType.SLASH :
					#CURRENT operator "." detected
					continue
				elif token.type == TokenType.DOT :
					#Advance to next token
					token = self.lexer.nextToken()
					if token is None or token.type == TokenType.SLASH :
						#PARENT operator ".." detected
						current_node = current_node.parent
						if current_node is None :
							raise StateReferenceException("Illegal use of PARENT \"..\" operator at position " + str(token.pos) + " in state reference. Root of statechart reached.")
					
					else :
						raise StateReferenceException("Illegal use of PARENT \"..\" operator at position " + str(token.pos) + " in state reference.")
	
				else :
					raise StateReferenceException("Illegal use of CURRENT \".\" operator at position " + str(token.pos) + " in state reference.")
					
			elif token.type == TokenType.SLASH :
				continue
			elif token.type == TokenType.WORD :
				#try to advance to next child state
				cname = token.val
				found = False
				for child in current_node.children :
					if child.name == cname : 
						found = True
						current_node = child
						break
				if not found :
					raise StateReferenceException("Refering to non exiting node at posisition " + str(token.pos) + " in state reference.")
			elif token.type == TokenType.LBRACKET :
				split_stack.append(current_node)
			elif token.type == TokenType.RBRACKET :
				if len(split_stack) > 0 :
#.........这里部分代码省略.........