def booleanExpression(self):
tree = Lexeme(token_type="BOOLEAN_EXPRESSION")
tmp = Lexeme(token_type="GLUE")
tmp.left = self.expression()
self.match("IS")
tree.left = self.boolOp()
tmp.right = self.expression()
tree.right = tmp
return tree
def ifStatement(self):
if self._debug: print(" in ifStatement")
self.match("IF")
tree = Lexeme(token_type="IF_STATEMENT")
tmp = Lexeme(token_type="GLUE")
tree.left = self.booleanExpression()
self.match("COMMA")
tmp.left = self.block()
tmp.right = self.optOtherwise()
tree.right = tmp
return tree
def statements(self):
if self._debug: print(" in statements")
tree = Lexeme(token_type="STATEMENTS")
tree.left = self.statement()
tree.right = self.optStatements()
return tree
def commaChain(self):
if self._debug: print(" in commaChain")
self.match("COMMA")
tree = Lexeme(token_type="GLUE")
tree.left = self.expression()
tree.right = self.optCommaChain()
return tree
def whileStatement(self):
if self._debug: print(" in whileStatement")
self.match("WHILE")
tree = Lexeme(token_type="WHILE_STATEMENT")
tree.left = self.booleanExpression()
self.match("COMMA")
tree.right = self.block()
return tree
def assignment(self):
if self._debug: print(" in assignment")
self.match("SET")
tree = Lexeme(token_type="ASSIGNMENT")
tree.left = self.match("VARIABLE")
self.match("TO")
tree.right = self.expression()
self.match("PERIOD")
return tree
def sequence(self):
if self._debug: print(" in sequence")
tree = Lexeme(token_type="GLUE") # this will be attached to the "head" in my environment
tree.left = self.expression()
if self.check("AND"):
self.match("AND")
tmp = Lexeme(token_type="GLUE")
tmp.left = self.expression()
tree.right = tmp
elif self.commaChainPending():
tmp = self.commaChain()
self.match("AND")
tracer = tmp
while tracer.right:
tracer = tracer.right
tracer.left = self.expression()
tree.right = tmp
return tree
def optCommaChain(self):
if self._debug: print(" in optCommaChain")
tree = None
if self.check("COMMA"):
tree = Lexeme(token_type="GLUE")
self.match("COMMA")
if self.expressionPending():
tree.left = self.expression()
tree.right = self.optCommaChain()
return tree
def sequence(self):
if self._debug: print(" in sequence")
tree = Lexeme(token_type="LIST")
tree.left = self.expression()
if self.check("AND"):
self.match("AND")
tmp = Lexeme(token_type="GLUE")
tmp.left = self.expression()
tree.right = tmp
elif self.commaChainPending():
tmp = self.commaChain()
self.match("AND")
tracer = tmp
while tracer.right:
tracer = tracer.right
tmp2 = Lexeme(token_type="GLUE")
tmp2.left = self.expression()
tracer.right = tmp2
tree.right = tmp
return tree