def __init__(self, AST, start='program'):
GenericASTBuilder.__init__(self, AST, start)
# list of tokens that should not be flattened by nonterminal()
self.primaryTypes = {
'proc_stmt': 1,
'param_declaration_block': 1,
'declaration_stmt': 1,
'declaration_block': 1,
'var_name': 1,
'decl_init_list': 1,
'decl_init_value': 1,
'decl_array_dims': 1,
'array_subscript': 1,
'list_flag': 1,
'body_block': 1,
'statement_block': 1,
'nonnull_stmt': 1,
'osescape_stmt': 1,
'assignment_stmt': 1,
'task_call_stmt': 1,
'if_stmt': 1,
'for_stmt': 1,
'while_stmt': 1,
'break_stmt': 1,
'next_stmt': 1,
'return_stmt': 1,
'goto_stmt': 1,
'label_stmt': 1,
'switch_stmt': 1,
'case_block': 1,
'case_stmt_block': 1,
'case_value': 1,
'compound_stmt': 1,
'empty_compound_stmt': 1,
'task_arglist': 1,
'comma_arglist': 1,
'fn_arglist': 1,
'arg': 1,
'empty_arg': 1,
'non_empty_arg': 1,
'no_arg': 1,
'param_name': 1,
'opt_comma': 1,
'bool_expr': 1,
}
self._currentFname = None
def nonterminal(self, atype, args):
#
# Flatten AST a bit by not making nodes if there's only
# one child, but retain a few primary structural
# elements.
#
if len(args) == 1 and not atype in self.primaryTypes:
return args[0]
return GenericASTBuilder.nonterminal(self, atype, args)
def parse(self, tokens, fname=None):
""" Override this, only so we can add the optional fname arg.
Delegate all parse logic to parent. """
self._currentFname = fname
return GenericASTBuilder.parse(self, tokens)