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module_printer.py
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865 lines (641 loc) · 25 KB
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import sys
import python_minifier.ast_compat as ast
from .expression_printer import ExpressionPrinter
from .token_printer import Delimiter
class ModulePrinter(ExpressionPrinter):
"""
Builds the smallest possible exact representation of an ast
"""
def __init__(self, indent_char='\t'):
super(ModulePrinter, self).__init__()
self.indent_char = indent_char
def __call__(self, module):
"""
Generate the source code for an AST
:param module: The Module to generate code for
:type module: ast.Module
:rtype: str
"""
assert isinstance(module, ast.Module)
self.visit_Module(module)
# On Python 2.7, preserve unicode strings to avoid encoding issues
code = unicode(self.printer) if sys.version_info[0] < 3 else str(self.printer)
return code.rstrip('\n' + self.indent_char + ';')
@property
def code(self):
# On Python 2.7, preserve unicode strings to avoid encoding issues
code = unicode(self.printer) if sys.version_info[0] < 3 else str(self.printer)
return code.rstrip('\n' + self.indent_char + ';')
# region Simple Statements
def visit_Exec(self, node):
assert isinstance(node, ast.Exec)
self.printer.keyword('exec')
self._expression(node.body)
if node.globals:
self.printer.keyword('in')
self._expression(node.globals)
if node.locals:
self.printer.delimiter(',')
self._expression(node.locals)
self.printer.end_statement()
def visit_Expr(self, node):
assert isinstance(node, ast.Expr)
if isinstance(node.value, (ast.Yield, ast.YieldFrom)):
self._yield_expr(node.value)
else:
self._testlist(node.value)
self.printer.end_statement()
def visit_Assert(self, node):
assert isinstance(node, ast.Assert)
self.printer.keyword('assert')
self._expression(node.test)
if node.msg:
self.printer.delimiter(',')
self._expression(node.msg)
self.printer.end_statement()
def visit_Assign(self, node):
assert isinstance(node, ast.Assign)
for target_node in node.targets:
self._testlist(target_node)
self.printer.delimiter('=')
# Yield nodes that are the sole node on the right hand side of an assignment do not need parens
if isinstance(node.value, (ast.Yield, ast.YieldFrom)):
self._yield_expr(node.value)
else:
self._testlist(node.value)
self.printer.end_statement()
def visit_AugAssign(self, node):
assert isinstance(node, ast.AugAssign)
self._testlist(node.target)
self.visit(node.op)
self.printer.delimiter('=')
# Yield nodes that are the sole node on the right hand side of an assignment do not need parens
if isinstance(node.value, (ast.Yield, ast.YieldFrom)):
self._yield_expr(node.value)
else:
self._testlist(node.value)
self.printer.end_statement()
def visit_AnnAssign(self, node):
assert isinstance(node, ast.AnnAssign)
if node.simple:
self.visit(node.target)
else:
self.printer.delimiter('(')
self._expression(node.target)
self.printer.delimiter(')')
if node.annotation:
self.printer.delimiter(':')
self._expression(node.annotation)
if node.value:
self.printer.delimiter('=')
self._expression(node.value)
self.printer.end_statement()
def visit_Pass(self, node):
assert isinstance(node, ast.Pass)
self.printer.keyword('pass')
self.printer.end_statement()
def visit_Delete(self, node):
assert isinstance(node, ast.Delete)
self.printer.keyword('del')
self._exprlist(node.targets)
self.printer.end_statement()
def visit_Return(self, node):
assert isinstance(node, ast.Return)
self.printer.keyword('return')
if isinstance(node.value, ast.Tuple):
if sys.version_info < (3, 8) and [n for n in node.value.elts if isinstance(n, ast.Starred)]:
self.printer.delimiter('(')
self._testlist(node.value)
self.printer.delimiter(')')
else:
self._testlist(node.value)
elif node.value is not None:
self._testlist(node.value)
self.printer.end_statement()
def visit_Print(self, node):
assert isinstance(node, ast.Print)
self.printer.keyword('print')
delimiter = Delimiter(self.printer)
if node.dest:
delimiter.new_item()
self.printer.operator('>>')
self._expression(node.dest)
for v in node.values:
delimiter.new_item()
self._expression(v)
if not node.nl:
self.printer.delimiter(',')
self.printer.end_statement()
def visit_Yield(self, node):
assert isinstance(node, ast.Yield)
self._yield_expr(node)
self.printer.end_statement()
def visit_YieldFrom(self, node):
assert isinstance(node, ast.YieldFrom)
self._yield_expr(node)
self.printer.end_statement()
def visit_Raise(self, node):
assert isinstance(node, ast.Raise)
self.printer.keyword('raise')
if hasattr(node, 'type'):
# Python2 raise node
if node.type:
self._expression(node.type)
if node.inst:
self.printer.delimiter(',')
self._expression(node.inst)
if node.tback:
self.printer.delimiter(',')
self._expression(node.tback)
else:
# Python3
if node.exc:
self._expression(node.exc)
if node.cause:
self.printer.keyword('from')
self._expression(node.cause)
self.printer.end_statement()
def visit_Break(self, node):
assert isinstance(node, ast.Break)
self.printer.keyword('break')
self.printer.end_statement()
def visit_Continue(self, node):
assert isinstance(node, ast.Continue)
self.printer.keyword('continue')
self.printer.end_statement()
def visit_Import(self, node):
assert isinstance(node, ast.Import)
self.printer.keyword('import')
delimiter = Delimiter(self.printer)
for n in node.names:
delimiter.new_item()
self.visit_alias(n)
self.printer.end_statement()
def visit_ImportFrom(self, node):
assert isinstance(node, ast.ImportFrom)
self.printer.keyword('from')
for _i in range(node.level):
self.printer.delimiter('.')
if node.module is not None:
self.printer.identifier(node.module)
self.printer.keyword('import')
delimiter = Delimiter(self.printer)
for n in node.names:
delimiter.new_item()
if node.module == '__future__' and n.name == 'unicode_literals':
self.printer.unicode_literals = True
if n.name == '*':
self.printer.operator('*')
else:
self.visit_alias(n)
self.printer.end_statement()
def visit_alias(self, node):
assert isinstance(node, ast.alias)
self.printer.identifier(node.name)
if node.asname:
self.printer.keyword('as')
self.printer.identifier(node.asname)
def visit_Global(self, node):
assert isinstance(node, ast.Global)
self.printer.keyword('global')
delimiter = Delimiter(self.printer)
for n in node.names:
delimiter.new_item()
self.printer.identifier(n)
self.printer.end_statement()
def visit_Nonlocal(self, node):
assert isinstance(node, ast.Nonlocal)
self.printer.keyword('nonlocal')
delimiter = Delimiter(self.printer)
for n in node.names:
delimiter.new_item()
self.printer.identifier(n)
self.printer.end_statement()
# endregion
# region Compound Statements
def visit_If(self, node, el=False):
assert isinstance(node, ast.If)
self.printer.newline()
if el:
self.printer.keyword('elif')
else:
self.printer.keyword('if')
self._expression(node.test)
self.printer.delimiter(':')
self._suite(node.body)
if node.orelse:
if len(node.orelse) == 1 and isinstance(node.orelse[0], ast.If):
# elif
self.visit_If(node.orelse[0], el=True)
self.printer.newline()
else:
# an else block
self.printer.keyword('else')
self.printer.delimiter(':')
self._suite(node.orelse)
def visit_For(self, node, is_async=False):
assert isinstance(node, (ast.For, ast.AsyncFor))
self.printer.newline()
if is_async:
self.printer.keyword('async')
self.printer.keyword('for')
self._exprlist([node.target])
self.printer.keyword('in')
self._expression(node.iter)
self.printer.delimiter(':')
self._suite(node.body)
if node.orelse:
self.printer.newline()
self.printer.keyword('else')
self.printer.delimiter(':')
self._suite(node.orelse)
def visit_While(self, node):
assert isinstance(node, ast.While)
self.printer.newline()
self.printer.keyword('while')
self._expression(node.test)
self.printer.delimiter(':')
self._suite(node.body)
if node.orelse:
self.printer.keyword('else')
self.printer.delimiter(':')
self._suite(node.orelse)
def visit_Try(self, node, star=False):
assert isinstance(node, (ast.Try, ast.TryStar))
self.printer.newline()
self.printer.keyword('try')
self.printer.delimiter(':')
self._suite(node.body)
[self.visit_ExceptHandler(n, star) for n in node.handlers]
if node.orelse:
self.printer.keyword('else')
self.printer.delimiter(':')
self._suite(node.orelse)
if node.finalbody:
self.printer.keyword('finally')
self.printer.delimiter(':')
self._suite(node.finalbody)
def visit_TryStar(self, node):
assert isinstance(node, ast.TryStar)
self.visit_Try(node, star=True)
def visit_TryFinally(self, node):
assert isinstance(node, ast.TryFinally)
if len(node.body) == 1 and isinstance(node.body[0], ast.TryExcept):
self.visit_TryExcept(node.body[0])
else:
self.printer.newline()
self.printer.keyword('try')
self.printer.delimiter(':')
self._suite(node.body)
if node.finalbody:
self.printer.keyword('finally')
self.printer.delimiter(':')
self._suite(node.finalbody)
def visit_TryExcept(self, node):
assert isinstance(node, ast.TryExcept)
self.printer.newline()
self.printer.keyword('try')
self.printer.delimiter(':')
self._suite(node.body)
[self.visit_ExceptHandler(n) for n in node.handlers]
if node.orelse:
self.printer.keyword('else')
self.printer.delimiter(':')
self._suite(node.orelse)
def visit_ExceptHandler(self, node, star=False):
assert isinstance(node, ast.ExceptHandler)
self.printer.keyword('except')
if star:
self.printer.operator('*')
if node.type is not None:
self._expression(node.type)
if node.name is not None:
self.printer.keyword('as')
if isinstance(node.name, str):
self.printer.identifier(node.name)
else:
self._expression(node.name)
self.printer.delimiter(':')
self._suite(node.body)
def visit_With(self, node, is_async=False):
assert isinstance(node, (ast.With, ast.AsyncWith))
self.printer.newline()
if is_async:
self.printer.keyword('async')
self.printer.keyword('with')
delimiter = Delimiter(self.printer)
if hasattr(node, 'items'):
for item in node.items:
delimiter.new_item()
if self.precedence(item.context_expr) != 0 and self.precedence(item.context_expr) <= self.precedence(
node
):
self.printer.delimiter('(')
self.visit_withitem(item)
self.printer.delimiter(')')
else:
self.visit_withitem(item)
else:
self.visit_withitem(node)
self.printer.delimiter(':')
self._suite(node.body)
def visit_withitem(self, node):
assert isinstance(node, (ast.withitem, ast.With))
self._expression(node.context_expr)
if node.optional_vars is not None:
self.printer.keyword('as')
self._expression(node.optional_vars)
def visit_FunctionDef(self, node, is_async=False):
assert isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef))
self.printer.newline()
for d in node.decorator_list:
self.printer.operator('@')
self._expression(d)
self.printer.newline()
if is_async:
self.printer.keyword('async')
self.printer.keyword('def')
self.printer.identifier(node.name)
if hasattr(node, 'type_params') and node.type_params:
self.printer.delimiter('[')
delimiter = Delimiter(self.printer)
for type_param in node.type_params:
delimiter.new_item()
self.visit(type_param)
self.printer.delimiter(']')
self.printer.delimiter('(')
self.visit_arguments(node.args)
self.printer.delimiter(')')
if hasattr(node, 'returns') and node.returns is not None:
self.printer.delimiter('->')
self._expression(node.returns)
self.printer.delimiter(':')
else:
self.printer.delimiter(':')
if hasattr(node, 'docstring') and node.docstring is not None:
self._suite([ast.Expr(value=ast.Str(s=node.docstring))] + node.body)
else:
self._suite(node.body)
def visit_ClassDef(self, node):
assert isinstance(node, ast.ClassDef)
self.printer.newline()
for d in node.decorator_list:
self.printer.operator('@')
self._expression(d)
self.printer.newline()
self.printer.keyword('class')
self.printer.identifier(node.name)
if hasattr(node, 'type_params') and node.type_params:
self.printer.delimiter('[')
delimiter = Delimiter(self.printer)
for type_param in node.type_params:
delimiter.new_item()
self.visit(type_param)
self.printer.delimiter(']')
with Delimiter(self.printer, add_parens=True) as delimiter:
for b in node.bases:
delimiter.new_item()
self._expression(b)
if hasattr(node, 'starargs') and node.starargs is not None:
delimiter.new_item()
self.printer.operator('*')
self._expression(node.starargs)
if hasattr(node, 'keywords'):
for kw in node.keywords:
delimiter.new_item()
self.visit_keyword(kw)
if hasattr(node, 'kwargs') and node.kwargs is not None:
delimiter.new_item()
self.printer.operator('**')
self.visit(node.kwargs)
self.printer.delimiter(':')
if hasattr(node, 'docstring') and node.docstring is not None:
self._suite([ast.Expr(value=ast.Str(s=node.docstring))] + node.body)
else:
self._suite(node.body)
# endregion
# region Pattern Matching
def pattern(self, pattern_node):
assert isinstance(pattern_node, (ast.MatchValue, ast.MatchAs, ast.MatchStar, ast.MatchOr, ast.MatchSingleton, ast.MatchClass, ast.MatchSequence, ast.MatchMapping))
self.visit(pattern_node)
def visit_Match(self, node):
assert isinstance(node, ast.Match)
self.printer.newline()
self.printer.keyword('match')
self._expression(node.subject)
self.printer.delimiter(':')
self._suite(node.cases)
def visit_match_case(self, node):
assert isinstance(node, ast.match_case)
self.printer.keyword('case')
if isinstance(node.pattern, ast.MatchSequence):
self.visit_MatchSequence(node.pattern, omit_brackets=True)
else:
self.pattern(node.pattern)
if node.guard is not None:
self.printer.keyword('if')
self.visit(node.guard)
self.printer.delimiter(':')
self._suite(node.body)
def visit_MatchValue(self, node):
assert isinstance(node, ast.MatchValue)
self.visit(node.value)
def visit_MatchSingleton(self, node):
assert isinstance(node, ast.MatchSingleton)
self.printer.identifier(repr(node.value))
def visit_MatchStar(self, node):
assert isinstance(node, ast.MatchStar)
self.printer.operator('*')
if node.name is None:
self.printer.identifier('_')
else:
self.printer.identifier(node.name)
def visit_MatchSequence(self, node, omit_brackets=False):
assert isinstance(node, ast.MatchSequence)
if len(node.patterns) < 2 or not omit_brackets:
self.printer.delimiter('[')
delimiter = Delimiter(self.printer)
for pattern in node.patterns:
delimiter.new_item()
self.pattern(pattern)
if len(node.patterns) < 2 or not omit_brackets:
self.printer.delimiter(']')
def visit_MatchMapping(self, node):
self.printer.delimiter('{')
delimiter = Delimiter(self.printer)
for k, p in zip(node.keys, node.patterns):
delimiter.new_item()
self._expression(k)
self.printer.delimiter(':')
self.pattern(p)
if node.rest is not None:
delimiter.new_item()
self.printer.operator('**')
self.printer.identifier(node.rest)
self.printer.delimiter('}')
def visit_MatchClass(self, node):
assert isinstance(node, ast.MatchClass)
self.visit(node.cls)
self.printer.delimiter('(')
delimiter = Delimiter(self.printer)
for pattern in node.patterns:
delimiter.new_item()
self.pattern(pattern)
for kwd, pattern in zip(node.kwd_attrs, node.kwd_patterns):
delimiter.new_item()
self.printer.identifier(kwd)
self.printer.delimiter('=')
self.pattern(pattern)
self.printer.delimiter(')')
def visit_MatchAs(self, node):
assert isinstance(node, ast.MatchAs)
if node.pattern is not None:
if isinstance(node.pattern, ast.MatchAs):
self.printer.delimiter('(')
self.pattern(node.pattern)
self.printer.delimiter(')')
else:
self.pattern(node.pattern)
self.printer.keyword('as')
if node.name is None:
self.printer.identifier('_')
else:
self.printer.identifier(node.name)
def visit_MatchOr(self, node):
assert isinstance(node, ast.MatchOr)
delimiter = Delimiter(self.printer, delimiter='|')
for pattern in node.patterns:
delimiter.new_item()
if isinstance(pattern, (ast.MatchAs, ast.MatchOr)):
self.printer.delimiter('(')
self.pattern(pattern)
self.printer.delimiter(')')
else:
self.pattern(pattern)
# endregion
# region async and await
def visit_AsyncFunctionDef(self, node):
assert isinstance(node, ast.AsyncFunctionDef)
self.visit_FunctionDef(node, is_async=True)
def visit_AsyncFor(self, node):
assert isinstance(node, ast.AsyncFor)
self.visit_For(node, is_async=True)
def visit_AsyncWith(self, node):
assert isinstance(node, ast.AsyncWith)
self.visit_With(node, is_async=True)
# endregion
# region Generic Types
def visit_TypeAlias(self, node):
assert isinstance(node, ast.TypeAlias)
self.printer.keyword('type')
self.visit_Name(node.name)
if hasattr(node, 'type_params') and node.type_params:
self.printer.delimiter('[')
delimiter = Delimiter(self.printer)
for param in node.type_params:
delimiter.new_item()
self.visit(param)
self.printer.delimiter(']')
self.printer.delimiter('=')
self._expression(node.value)
self.printer.end_statement()
def visit_TypeVar(self, node):
assert isinstance(node, ast.TypeVar)
assert isinstance(node.name, str)
self.printer.identifier(node.name)
if node.bound:
self.printer.delimiter(':')
self._expression(node.bound)
if hasattr(node, 'default_value') and node.default_value is not None:
self.printer.delimiter('=')
self._expression(node.default_value)
def visit_TypeVarTuple(self, node):
assert isinstance(node, ast.TypeVarTuple)
self.printer.operator('*')
self.printer.identifier(node.name)
if hasattr(node, 'default_value') and node.default_value is not None:
self.printer.delimiter('=')
self._expression(node.default_value)
def visit_ParamSpec(self, node):
assert isinstance(node, ast.ParamSpec)
self.printer.operator('*')
self.printer.operator('*')
self.printer.identifier(node.name)
if hasattr(node, 'default_value') and node.default_value is not None:
self.printer.delimiter('=')
self._expression(node.default_value)
# endregion
def visit_Module(self, node):
if hasattr(node, 'docstring') and node.docstring is not None:
# Python 3.6 added a docstring field! Really useful for every use case except this one...
# Put the docstring back into the body
self._suite_body([ast.Expr(value=ast.Str(s=node.docstring))] + node.body)
else:
self._suite_body(node.body)
def _suite(self, node_list):
compound_statements = [
'For',
'While',
'Try',
'TryStar',
'If',
'With',
'ClassDef',
'TryFinally',
'TryExcept',
'FunctionDef',
'AsyncFunctionDef',
'AsyncFor',
'AsyncWith',
'Match',
'match_case'
]
if [node for node in node_list if node.__class__.__name__ in compound_statements]:
self.printer.enter_block()
self._suite_body(node_list)
self.printer.leave_block()
else:
self.printer.indent += 1
self._suite_body(node_list)
self.printer.indent -= 1
self.printer.newline()
def _suite_body(self, node_list):
statements = {
'Assign': self.visit_Assign,
'AnnAssign': self.visit_AnnAssign,
'AugAssign': self.visit_AugAssign,
'Expr': self.visit_Expr,
'Delete': self.visit_Delete,
'Pass': self.visit_Pass,
'Import': self.visit_Import,
'ImportFrom': self.visit_ImportFrom,
'Global': self.visit_Global,
'Nonlocal': self.visit_Nonlocal,
'Assert': self.visit_Assert,
'Break': self.visit_Break,
'Continue': self.visit_Continue,
'Return': self.visit_Return,
'Raise': self.visit_Raise,
'Yield': self.visit_Yield,
'YieldFrom': self.visit_YieldFrom,
'For': self.visit_For,
'While': self.visit_While,
'Try': self.visit_Try,
'TryStar': self.visit_TryStar,
'If': self.visit_If,
'With': self.visit_With,
'ClassDef': self.visit_ClassDef,
'FunctionDef': self.visit_FunctionDef,
'AsyncFunctionDef': self.visit_AsyncFunctionDef,
'AsyncFor': self.visit_AsyncFor,
'AsyncWith': self.visit_AsyncWith,
'TryFinally': self.visit_TryFinally,
'TryExcept': self.visit_TryExcept,
'Print': self.visit_Print,
'Exec': self.visit_Exec,
'Match': self.visit_Match,
'match_case': self.visit_match_case,
'TypeAlias': self.visit_TypeAlias
}
for node in node_list:
statements[node.__class__.__name__](node)