def statements(self):
res = ParseResult()
statements = []
pos_start = self.current_tok.pos_start.copy()
while self.current_tok.type == token.T_NEWLINE:
res.register_advancement()
self.advance()
statement = res.register(self.statement())
if res.error: return res
statements.append(statement)
more_statements = True
while True:
newline_count = 0
while self.current_tok.type == token.T_NEWLINE:
res.register_advancement()
self.advance()
newline_count += 1
if newline_count == 0:
more_statements = False
if not more_statements: break
statement = res.try_register(self.statement())
if not statement:
self.reverse(res.to_reverse_count)
more_statements = False
continue
statements.append(statement)
return res.success(
nodes.ListNode(statements, pos_start,
self.current_tok.pos_end.copy()))
def parse(self): if len(self.tokens) == 1 and self.tokens[0].type == token.T_EOF: return ParseResult().success(nodes.ListNode([], self.tokens[0].pos_start, self.tokens[0].pos_end)) res = self.statements() if not res.error and self.current_tok.type != token.T_EOF: return res.failure(errors.InvalidSyntaxError( self.current_tok.pos_start, self.current_tok.pos_end, "Expected '+', '-', '*' or '/'" )) return res
def list_expr(self):
res = ParseResult()
element_nodes = []
pos_start = self.current_tok.pos_start.copy()
if self.current_tok.type != token.T_LSQUARE:
return res.failure(
errors.InvalidSyntaxError(self.current_tok.pos_start,
self.current_tok.pos_end,
f"Expected '['"))
res.register_advancement()
self.advance()
if self.current_tok.type == token.T_RSQUARE:
res.register_advancement()
self.advance()
else:
element_nodes.append(res.register(self.expr()))
if res.error:
return res.failure(
errors.InvalidSyntaxError(
self.current_tok.pos_start, self.current_tok.pos_end,
"Expected ']', 'var', 'if', 'for', 'while', 'func', int, float, identifier, '+', '-', '(', '[' or 'not'"
))
while self.current_tok.type == token.T_COMMA:
res.register_advancement()
self.advance()
element_nodes.append(res.register(self.expr()))
if res.error: return res
if self.current_tok.type != token.T_RSQUARE:
return res.failure(
errors.InvalidSyntaxError(self.current_tok.pos_start,
self.current_tok.pos_end,
"Expected ',' or ']'"))
res.register_advancement()
self.advance()
return res.success(
nodes.ListNode(element_nodes, pos_start,
self.current_tok.pos_end.copy()))