def parse(self, tokens):
start_number = self._grammar.symbol2number[self._start_symbol]
self.pgen_parser = PgenParser(
self._grammar, self.convert_node, self.convert_leaf,
self.error_recovery, start_number
)
node = self.pgen_parser.parse(tokens)
# The stack is empty now, we don't need it anymore.
del self.pgen_parser
return node
def parse(self, tokenizer):
if self._parsed is not None:
return self._parsed
start_number = self._grammar.symbol2number[self._start_symbol]
pgen_parser = PgenParser(self._grammar, self.convert_node,
self.convert_leaf, self.error_recovery,
start_number)
try:
self._parsed = pgen_parser.parse(tokenizer)
finally:
self.stack = pgen_parser.stack
if self._start_symbol == 'file_input' != self._parsed.type:
# If there's only one statement, we get back a non-module. That's
# not what we want, we want a module, so we add it here:
self._parsed = self.convert_node(
self._grammar, self._grammar.symbol2number['file_input'],
[self._parsed])
if self._added_newline:
self.remove_last_newline()
def __init__(self, grammar, source, module_path=None, tokenizer=None):
self._ast_mapping = {
'expr_stmt': pt.ExprStmt,
'classdef': pt.Class,
'funcdef': pt.Function,
'file_input': pt.Module,
'import_name': pt.ImportName,
'import_from': pt.ImportFrom,
'break_stmt': pt.KeywordStatement,
'continue_stmt': pt.KeywordStatement,
'return_stmt': pt.ReturnStmt,
'raise_stmt': pt.KeywordStatement,
'yield_expr': pt.YieldExpr,
'del_stmt': pt.KeywordStatement,
'pass_stmt': pt.KeywordStatement,
'global_stmt': pt.GlobalStmt,
'nonlocal_stmt': pt.KeywordStatement,
'assert_stmt': pt.AssertStmt,
'if_stmt': pt.IfStmt,
'with_stmt': pt.WithStmt,
'for_stmt': pt.ForStmt,
'while_stmt': pt.WhileStmt,
'try_stmt': pt.TryStmt,
'comp_for': pt.CompFor,
'decorator': pt.Decorator,
'lambdef': pt.Lambda,
'old_lambdef': pt.Lambda,
'lambdef_nocond': pt.Lambda,
}
self.syntax_errors = []
self._global_names = []
self._omit_dedent_list = []
self._indent_counter = 0
self._last_failed_start_pos = (0, 0)
# TODO do print absolute import detection here.
#try:
# del python_grammar_no_print_statement.keywords["print"]
#except KeyError:
# pass # Doesn't exist in the Python 3 grammar.
#if self.options["print_function"]:
# python_grammar = pygram.python_grammar_no_print_statement
#else:
self._used_names = {}
self._scope_names_stack = [{}]
self._error_statement_stacks = []
added_newline = False
# The Python grammar needs a newline at the end of each statement.
if not source.endswith('\n'):
source += '\n'
added_newline = True
# For the fast parser.
self.position_modifier = pt.PositionModifier()
p = PgenParser(grammar, self.convert_node, self.convert_leaf,
self.error_recovery)
tokenizer = tokenizer or tokenize.source_tokens(source)
self.module = p.parse(self._tokenize(tokenizer))
if self.module.type != 'file_input':
# If there's only one statement, we get back a non-module. That's
# not what we want, we want a module, so we add it here:
self.module = self.convert_node(
grammar, grammar.symbol2number['file_input'], [self.module])
if added_newline:
self.remove_last_newline()
self.module.used_names = self._used_names
self.module.path = module_path
self.module.global_names = self._global_names
self.module.error_statement_stacks = self._error_statement_stacks
