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 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()
class BaseParser(object):
node_map = {}
default_node = tree.Node
leaf_map = {
}
default_leaf = tree.Leaf
def __init__(self, grammar, start_symbol='file_input', error_recovery=False):
self._grammar = grammar
self._start_symbol = start_symbol
self._error_recovery = error_recovery
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 error_recovery(self, grammar, stack, arcs, typ, value, start_pos, prefix,
add_token_callback):
if self._error_recovery:
raise NotImplementedError("Error Recovery is not implemented")
else:
raise ParserSyntaxError('SyntaxError: invalid syntax', start_pos)
def convert_node(self, grammar, type_, children):
# TODO REMOVE symbol, we don't want type here.
symbol = grammar.number2symbol[type_]
try:
return self.node_map[symbol](children)
except KeyError:
return self.default_node(symbol, children)
def convert_leaf(self, grammar, type_, value, prefix, start_pos):
try:
return self.leaf_map[type_](value, start_pos, prefix)
except KeyError:
return self.default_leaf(value, start_pos, prefix)
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
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
class Parser(object):
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,
'print_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,
}
def __init__(self, grammar, source, start_symbol='file_input',
tokenizer=None, start_parsing=True):
# Todo Remove start_parsing (with False)
self._used_names = {}
self.source = source
self._added_newline = False
# The Python grammar needs a newline at the end of each statement.
if not source.endswith('\n') and start_symbol == 'file_input':
source += '\n'
self._added_newline = True
self._start_symbol = start_symbol
self._grammar = grammar
self._parsed = None
if start_parsing:
if tokenizer is None:
tokenizer = tokenize.source_tokens(source, use_exact_op_types=True)
self.parse(tokenizer)
def parse(self, tokenizer):
if self._parsed is not None:
return self._parsed
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
)
self._parsed = self.pgen_parser.parse(tokenizer)
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()
# The stack is empty now, we don't need it anymore.
del self.pgen_parser
return self._parsed
def get_parsed_node(self):
# TODO remove in favor of get_root_node
return self._parsed
def get_root_node(self):
return self._parsed
def error_recovery(self, grammar, stack, arcs, typ, value, start_pos, prefix,
add_token_callback):
raise ParseError
def convert_node(self, grammar, type, children):
"""
Convert raw node information to a Node instance.
This is passed to the parser driver which calls it whenever a reduction of a
grammar rule produces a new complete node, so that the tree is build
strictly bottom-up.
"""
symbol = grammar.number2symbol[type]
try:
return Parser.AST_MAPPING[symbol](children)
except KeyError:
if symbol == 'suite':
# We don't want the INDENT/DEDENT in our parser tree. Those
# leaves are just cancer. They are virtual leaves and not real
# ones and therefore have pseudo start/end positions and no
# prefixes. Just ignore them.
children = [children[0]] + children[2:-1]
return pt.Node(symbol, children)
def convert_leaf(self, grammar, type, value, prefix, start_pos):
# print('leaf', repr(value), token.tok_name[type])
if type == tokenize.NAME:
if value in grammar.keywords:
return pt.Keyword(value, start_pos, prefix)
else:
name = pt.Name(value, start_pos, prefix)
# Keep a listing of all used names
arr = self._used_names.setdefault(name.value, [])
arr.append(name)
return name
elif type == STRING:
return pt.String(value, start_pos, prefix)
elif type == NUMBER:
return pt.Number(value, start_pos, prefix)
elif type == NEWLINE:
return pt.Newline(value, start_pos, prefix)
elif type == ENDMARKER:
return pt.EndMarker(value, start_pos, prefix)
else:
return pt.Operator(value, start_pos, prefix)
def remove_last_newline(self):
endmarker = self._parsed.children[-1]
# The newline is either in the endmarker as a prefix or the previous
# leaf as a newline token.
prefix = endmarker.prefix
if prefix.endswith('\n'):
endmarker.prefix = prefix = prefix[:-1]
last_end = 0
if '\n' not in prefix:
# Basically if the last line doesn't end with a newline. we
# have to add the previous line's end_position.
try:
last_end = endmarker.get_previous_leaf().end_pos[1]
except IndexError:
pass
last_line = re.sub('.*\n', '', prefix)
endmarker.start_pos = endmarker.line - 1, last_end + len(last_line)
else:
try:
newline = endmarker.get_previous_leaf()
except IndexError:
return # This means that the parser is empty.
assert newline.value.endswith('\n')
newline.value = newline.value[:-1]
endmarker.start_pos = \
newline.start_pos[0], newline.start_pos[1] + len(newline.value)
