1731 lines
65 KiB
Python
Executable File
1731 lines
65 KiB
Python
Executable File
# -*- encoding: utf-8 -*-
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# Copyright 2018 the authors.
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# This file is part of Hy, which is free software licensed under the Expat
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# license. See the LICENSE.
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from hy.models import (HyObject, HyExpression, HyKeyword, HyInteger, HyComplex,
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HyString, HyBytes, HySymbol, HyFloat, HyList, HySet,
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HyDict, HySequence, wrap_value)
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from hy.model_patterns import (FORM, SYM, KEYWORD, STR, sym, brackets, whole,
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notpexpr, dolike, pexpr, times, Tag, tag, unpack)
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from funcparserlib.parser import some, many, oneplus, maybe, NoParseError
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from hy.errors import HyCompileError, HyTypeError
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from hy.lex.parser import mangle, unmangle
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import hy.macros
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from hy._compat import (
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str_type, bytes_type, long_type, PY3, PY35, raise_empty)
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from hy.macros import require, macroexpand, tag_macroexpand
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import hy.importer
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import traceback
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import importlib
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import ast
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import sys
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import copy
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from collections import defaultdict
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if PY3:
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import builtins
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else:
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import __builtin__ as builtins
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Inf = float('inf')
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def ast_str(x, piecewise=False):
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if piecewise:
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return ".".join(ast_str(s) if s else "" for s in x.split("."))
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x = mangle(x)
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return x if PY3 else x.encode('UTF8')
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_special_form_compilers = {}
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_model_compilers = {}
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_decoratables = (ast.FunctionDef, ast.ClassDef)
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if PY35:
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_decoratables += (ast.AsyncFunctionDef,)
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# _bad_roots are fake special operators, which are used internally
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# by other special forms (e.g., `except` in `try`) but can't be
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# used to construct special forms themselves.
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_bad_roots = tuple(ast_str(x) for x in (
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"unquote", "unquote-splice", "unpack-mapping", "except"))
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def special(names, pattern):
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"""Declare special operators. The decorated method and the given pattern
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is assigned to _special_form_compilers for each of the listed names."""
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pattern = whole(pattern)
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def dec(fn):
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for name in names if isinstance(names, list) else [names]:
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if isinstance(name, tuple):
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condition, name = name
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if not condition:
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continue
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_special_form_compilers[ast_str(name)] = (fn, pattern)
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return fn
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return dec
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def builds_model(*model_types):
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"Assign the decorated method to _model_compilers for the given types."
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def _dec(fn):
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for t in model_types:
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_model_compilers[t] = fn
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return fn
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return _dec
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# Provide asty.Foo(x, ...) as shorthand for
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# ast.Foo(..., lineno=x.start_line, col_offset=x.start_column) or
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# ast.Foo(..., lineno=x.lineno, col_offset=x.col_offset)
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class Asty(object):
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def __getattr__(self, name):
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setattr(Asty, name, staticmethod(lambda x, **kwargs: getattr(ast, name)(
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lineno=getattr(
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x, 'start_line', getattr(x, 'lineno', None)),
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col_offset=getattr(
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x, 'start_column', getattr(x, 'col_offset', None)),
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**kwargs)))
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return getattr(Asty, name)
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asty = Asty()
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class Result(object):
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"""
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Smart representation of the result of a hy->AST compilation
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This object tries to reconcile the hy world, where everything can be used
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as an expression, with the Python world, where statements and expressions
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need to coexist.
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To do so, we represent a compiler result as a list of statements `stmts`,
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terminated by an expression context `expr`. The expression context is used
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when the compiler needs to use the result as an expression.
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Results are chained by addition: adding two results together returns a
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Result representing the succession of the two Results' statements, with
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the second Result's expression context.
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We make sure that a non-empty expression context does not get clobbered by
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adding more results, by checking accesses to the expression context. We
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assume that the context has been used, or deliberately ignored, if it has
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been accessed.
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The Result object is interoperable with python AST objects: when an AST
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object gets added to a Result object, it gets converted on-the-fly.
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"""
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__slots__ = ("imports", "stmts", "temp_variables",
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"_expr", "__used_expr", "contains_yield")
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def __init__(self, *args, **kwargs):
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if args:
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# emulate kw-only args for future bits.
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raise TypeError("Yo: Hacker: don't pass me real args, dingus")
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self.imports = defaultdict(set)
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self.stmts = []
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self.temp_variables = []
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self._expr = None
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self.contains_yield = False
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self.__used_expr = False
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# XXX: Make sure we only have AST where we should.
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for kwarg in kwargs:
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if kwarg not in ["imports", "contains_yield", "stmts", "expr",
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"temp_variables"]:
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raise TypeError(
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"%s() got an unexpected keyword argument '%s'" % (
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self.__class__.__name__, kwarg))
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setattr(self, kwarg, kwargs[kwarg])
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@property
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def expr(self):
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self.__used_expr = True
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return self._expr
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@expr.setter
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def expr(self, value):
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self.__used_expr = False
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self._expr = value
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@property
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def lineno(self):
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if self._expr is not None:
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return self._expr.lineno
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if self.stmts:
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return self.stmts[-1].lineno
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return None
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@property
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def col_offset(self):
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if self._expr is not None:
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return self._expr.col_offset
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if self.stmts:
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return self.stmts[-1].col_offset
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return None
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def add_imports(self, mod, imports):
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"""Autoimport `imports` from `mod`"""
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self.imports[mod].update(imports)
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def is_expr(self):
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"""Check whether I am a pure expression"""
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return self._expr and not (self.imports or self.stmts)
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@property
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def force_expr(self):
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"""Force the expression context of the Result.
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If there is no expression context, we return a "None" expression.
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"""
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if self.expr:
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return self.expr
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return ast.Name(
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id=ast_str("None"),
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ctx=ast.Load(),
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lineno=self.stmts[-1].lineno if self.stmts else 0,
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col_offset=self.stmts[-1].col_offset if self.stmts else 0)
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def expr_as_stmt(self):
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"""Convert the Result's expression context to a statement
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This is useful when we want to use the stored expression in a
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statement context (for instance in a code branch).
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We drop ast.Names if they are appended to statements, as they
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can't have any side effect. "Bare" names still get converted to
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statements.
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If there is no expression context, return an empty result.
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"""
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if self.expr and not (isinstance(self.expr, ast.Name) and self.stmts):
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return Result() + asty.Expr(self.expr, value=self.expr)
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return Result()
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def rename(self, new_name):
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"""Rename the Result's temporary variables to a `new_name`.
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We know how to handle ast.Names and ast.FunctionDefs.
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"""
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new_name = ast_str(new_name)
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for var in self.temp_variables:
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if isinstance(var, ast.Name):
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var.id = new_name
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var.arg = new_name
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elif isinstance(var, ast.FunctionDef):
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var.name = new_name
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elif PY35 and isinstance(var, ast.AsyncFunctionDef):
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var.name = new_name
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else:
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raise TypeError("Don't know how to rename a %s!" % (
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var.__class__.__name__))
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self.temp_variables = []
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def __add__(self, other):
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# If we add an ast statement, convert it first
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if isinstance(other, ast.stmt):
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return self + Result(stmts=[other])
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# If we add an ast expression, clobber the expression context
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if isinstance(other, ast.expr):
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return self + Result(expr=other)
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if isinstance(other, ast.excepthandler):
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return self + Result(stmts=[other])
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if not isinstance(other, Result):
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raise TypeError("Can't add %r with non-compiler result %r" % (
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self, other))
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# Check for expression context clobbering
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if self.expr and not self.__used_expr:
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traceback.print_stack()
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print("Bad boy clobbered expr %s with %s" % (
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ast.dump(self.expr),
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ast.dump(other.expr)))
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# Fairly obvious addition
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result = Result()
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result.imports = other.imports
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result.stmts = self.stmts + other.stmts
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result.expr = other.expr
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result.temp_variables = other.temp_variables
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result.contains_yield = False
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if self.contains_yield or other.contains_yield:
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result.contains_yield = True
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return result
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def __str__(self):
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return (
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"Result(imports=[%s], stmts=[%s], "
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"expr=%s, contains_yield=%s)"
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) % (
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", ".join(ast.dump(x) for x in self.imports),
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", ".join(ast.dump(x) for x in self.stmts),
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ast.dump(self.expr) if self.expr else None,
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self.contains_yield
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)
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def is_unpack(kind, x):
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return (isinstance(x, HyExpression)
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and len(x) > 0
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and isinstance(x[0], HySymbol)
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and x[0] == "unpack-" + kind)
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_stdlib = {}
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class HyASTCompiler(object):
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def __init__(self, module_name):
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self.anon_var_count = 0
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self.imports = defaultdict(set)
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self.module_name = module_name
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self.temp_if = None
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self.can_use_stdlib = (
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not module_name.startswith("hy.core")
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or module_name == "hy.core.macros")
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# Everything in core needs to be explicit (except for
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# the core macros, which are built with the core functions).
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if self.can_use_stdlib and not _stdlib:
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# Populate _stdlib.
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import hy.core
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for module in hy.core.STDLIB:
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mod = importlib.import_module(module)
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for e in map(ast_str, mod.EXPORTS):
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if getattr(mod, e) is not getattr(builtins, e, ''):
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# Don't bother putting a name in _stdlib if it
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# points to a builtin with the same name. This
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# prevents pointless imports.
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_stdlib[e] = module
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def get_anon_var(self):
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self.anon_var_count += 1
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return "_hy_anon_var_%s" % self.anon_var_count
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def update_imports(self, result):
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"""Retrieve the imports from the result object"""
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for mod in result.imports:
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self.imports[mod].update(result.imports[mod])
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def imports_as_stmts(self, expr):
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"""Convert the Result's imports to statements"""
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ret = Result()
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for module, names in self.imports.items():
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if None in names:
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e = HyExpression([
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HySymbol("import"),
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HySymbol(module),
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]).replace(expr)
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ret += self.compile(e)
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names = sorted(name for name in names if name)
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if names:
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e = HyExpression([
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HySymbol("import"),
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HyList([
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HySymbol(module),
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HyList([HySymbol(name) for name in names])
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])
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]).replace(expr)
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ret += self.compile(e)
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self.imports = defaultdict(set)
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return ret.stmts
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def compile_atom(self, atom):
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# Compilation methods may mutate the atom, so copy it first.
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atom = copy.copy(atom)
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return Result() + _model_compilers[type(atom)](self, atom)
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def compile(self, tree):
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if tree is None:
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return Result()
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try:
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ret = self.compile_atom(tree)
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self.update_imports(ret)
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return ret
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except HyCompileError:
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# compile calls compile, so we're going to have multiple raise
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# nested; so let's re-raise this exception, let's not wrap it in
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# another HyCompileError!
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raise
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except HyTypeError:
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raise
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except Exception as e:
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raise_empty(HyCompileError, e, sys.exc_info()[2])
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def _compile_collect(self, exprs, with_kwargs=False, dict_display=False,
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oldpy_unpack=False):
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"""Collect the expression contexts from a list of compiled expression.
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This returns a list of the expression contexts, and the sum of the
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Result objects passed as arguments.
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"""
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compiled_exprs = []
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ret = Result()
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keywords = []
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oldpy_starargs = None
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oldpy_kwargs = None
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exprs_iter = iter(exprs)
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for expr in exprs_iter:
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if not PY35 and oldpy_unpack and is_unpack("iterable", expr):
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if oldpy_starargs:
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raise HyTypeError(expr, "Pythons < 3.5 allow only one "
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"`unpack-iterable` per call")
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oldpy_starargs = self.compile(expr[1])
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ret += oldpy_starargs
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oldpy_starargs = oldpy_starargs.force_expr
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elif is_unpack("mapping", expr):
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ret += self.compile(expr[1])
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if PY35:
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if dict_display:
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compiled_exprs.append(None)
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compiled_exprs.append(ret.force_expr)
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elif with_kwargs:
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keywords.append(asty.keyword(
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expr, arg=None, value=ret.force_expr))
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elif oldpy_unpack:
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if oldpy_kwargs:
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raise HyTypeError(expr, "Pythons < 3.5 allow only one "
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"`unpack-mapping` per call")
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oldpy_kwargs = ret.force_expr
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elif with_kwargs and isinstance(expr, HyKeyword):
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try:
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value = next(exprs_iter)
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except StopIteration:
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raise HyTypeError(expr,
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"Keyword argument {kw} needs "
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"a value.".format(kw=expr))
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if not expr:
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raise HyTypeError(expr, "Can't call a function with the "
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"empty keyword")
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compiled_value = self.compile(value)
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ret += compiled_value
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arg = str_type(expr)[1:]
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keywords.append(asty.keyword(
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expr, arg=ast_str(arg), value=compiled_value.force_expr))
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else:
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ret += self.compile(expr)
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compiled_exprs.append(ret.force_expr)
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if oldpy_unpack:
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return compiled_exprs, ret, keywords, oldpy_starargs, oldpy_kwargs
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else:
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return compiled_exprs, ret, keywords
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def _compile_branch(self, exprs):
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"""Make a branch out of an iterable of Result objects
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This generates a Result from the given sequence of Results, forcing each
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expression context as a statement before the next result is used.
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We keep the expression context of the last argument for the returned Result
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"""
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ret = Result()
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for x in map(self.compile, exprs[:-1]):
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ret += x
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ret += x.expr_as_stmt()
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if exprs:
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ret += self.compile(exprs[-1])
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return ret
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def _storeize(self, expr, name, func=None):
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"""Return a new `name` object with an ast.Store() context"""
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if not func:
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func = ast.Store
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if isinstance(name, Result):
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if not name.is_expr():
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raise HyTypeError(expr,
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"Can't assign or delete a non-expression")
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name = name.expr
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if isinstance(name, (ast.Tuple, ast.List)):
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typ = type(name)
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new_elts = []
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for x in name.elts:
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new_elts.append(self._storeize(expr, x, func))
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new_name = typ(elts=new_elts)
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elif isinstance(name, ast.Name):
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new_name = ast.Name(id=name.id)
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elif isinstance(name, ast.Subscript):
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new_name = ast.Subscript(value=name.value, slice=name.slice)
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elif isinstance(name, ast.Attribute):
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new_name = ast.Attribute(value=name.value, attr=name.attr)
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elif PY3 and isinstance(name, ast.Starred):
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new_name = ast.Starred(
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value=self._storeize(expr, name.value, func))
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else:
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raise HyTypeError(expr,
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"Can't assign or delete a %s" %
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type(expr).__name__)
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new_name.ctx = func()
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ast.copy_location(new_name, name)
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return new_name
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def _render_quoted_form(self, form, level):
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"""
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Render a quoted form as a new HyExpression.
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`level` is the level of quasiquoting of the current form. We can
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unquote if level is 0.
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Returns a three-tuple (`imports`, `expression`, `splice`).
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The `splice` return value is used to mark `unquote-splice`d forms.
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We need to distinguish them as want to concatenate them instead of
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just nesting them.
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"""
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op = None
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if isinstance(form, HyExpression) and form and (
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isinstance(form[0], HySymbol)):
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op = unmangle(ast_str(form[0]))
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if level == 0 and op in ("unquote", "unquote-splice"):
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if len(form) != 2:
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raise HyTypeError(form,
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("`%s' needs 1 argument, got %s" %
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op, len(form) - 1))
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return set(), form[1], op == "unquote-splice"
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elif op == "quasiquote":
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level += 1
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elif op in ("unquote", "unquote-splice"):
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level -= 1
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name = form.__class__.__name__
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imports = set([name])
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body = [form]
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if isinstance(form, HySequence):
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contents = []
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for x in form:
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f_imps, f_contents, splice = self._render_quoted_form(x, level)
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imports.update(f_imps)
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if splice:
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contents.append(HyExpression([
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HySymbol("list"),
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HyExpression([HySymbol("or"), f_contents, HyList()])]))
|
|
else:
|
|
contents.append(HyList([f_contents]))
|
|
if form:
|
|
# If there are arguments, they can be spliced
|
|
# so we build a sum...
|
|
body = [HyExpression([HySymbol("+"), HyList()] + contents)]
|
|
else:
|
|
body = [HyList()]
|
|
|
|
elif isinstance(form, HySymbol):
|
|
body = [HyString(form)]
|
|
|
|
elif isinstance(form, HyKeyword):
|
|
body = [HyString(form.name)]
|
|
|
|
elif isinstance(form, HyString) and form.brackets is not None:
|
|
body.extend([HyKeyword("brackets"), form.brackets])
|
|
|
|
ret = HyExpression([HySymbol(name)] + body).replace(form)
|
|
return imports, ret, False
|
|
|
|
@special(["quote", "quasiquote"], [FORM])
|
|
def compile_quote(self, expr, root, arg):
|
|
level = Inf if root == "quote" else 0 # Only quasiquotes can unquote
|
|
imports, stmts, _ = self._render_quoted_form(arg, level)
|
|
ret = self.compile(stmts)
|
|
ret.add_imports("hy", imports)
|
|
return ret
|
|
|
|
@special("unpack-iterable", [FORM])
|
|
def compile_unpack_iterable(self, expr, root, arg):
|
|
if not PY3:
|
|
raise HyTypeError(expr, "`unpack-iterable` isn't allowed here")
|
|
ret = self.compile(arg)
|
|
ret += asty.Starred(expr, value=ret.force_expr, ctx=ast.Load())
|
|
return ret
|
|
|
|
@special([(not PY3, "exec*")], [FORM, maybe(FORM), maybe(FORM)])
|
|
# Under Python 3, `exec` is a function rather than a statement type, so Hy
|
|
# doesn't need a special form for it.
|
|
def compile_exec(self, expr, root, body, globals_, locals_):
|
|
return asty.Exec(
|
|
expr,
|
|
body=self.compile(body).force_expr,
|
|
globals=self.compile(globals_).force_expr if globals_ is not None else None,
|
|
locals=self.compile(locals_).force_expr if locals_ is not None else None)
|
|
|
|
@special("do", [many(FORM)])
|
|
def compile_do(self, expr, root, body):
|
|
return self._compile_branch(body)
|
|
|
|
@special("raise", [maybe(FORM), maybe(sym(":from") + FORM)])
|
|
def compile_raise_expression(self, expr, root, exc, cause):
|
|
ret = Result()
|
|
|
|
if exc is not None:
|
|
exc = self.compile(exc)
|
|
ret += exc
|
|
exc = exc.force_expr
|
|
|
|
if cause is not None:
|
|
if not PY3:
|
|
raise HyTypeError(expr, "raise from only supported in python 3")
|
|
cause = self.compile(cause)
|
|
ret += cause
|
|
cause = cause.force_expr
|
|
|
|
return ret + asty.Raise(
|
|
expr, type=ret.expr, exc=exc,
|
|
inst=None, tback=None, cause=cause)
|
|
|
|
@special("try",
|
|
[many(notpexpr("except", "else", "finally")),
|
|
many(pexpr(sym("except"),
|
|
brackets() | brackets(FORM) | brackets(SYM, FORM),
|
|
many(FORM))),
|
|
maybe(dolike("else")),
|
|
maybe(dolike("finally"))])
|
|
def compile_try_expression(self, expr, root, body, catchers, orelse, finalbody):
|
|
body = self._compile_branch(body)
|
|
|
|
return_var = asty.Name(
|
|
expr, id=ast_str(self.get_anon_var()), ctx=ast.Store())
|
|
|
|
handler_results = Result()
|
|
handlers = []
|
|
for catcher in catchers:
|
|
handler_results += self._compile_catch_expression(
|
|
catcher, return_var, *catcher)
|
|
handlers.append(handler_results.stmts.pop())
|
|
|
|
if orelse is None:
|
|
orelse = []
|
|
else:
|
|
orelse = self._compile_branch(orelse)
|
|
orelse += asty.Assign(expr, targets=[return_var],
|
|
value=orelse.force_expr)
|
|
orelse += orelse.expr_as_stmt()
|
|
orelse = orelse.stmts
|
|
|
|
if finalbody is None:
|
|
finalbody = []
|
|
else:
|
|
finalbody = self._compile_branch(finalbody)
|
|
finalbody += finalbody.expr_as_stmt()
|
|
finalbody = finalbody.stmts
|
|
|
|
# Using (else) without (except) is verboten!
|
|
if orelse and not handlers:
|
|
raise HyTypeError(
|
|
expr,
|
|
"`try' cannot have `else' without `except'")
|
|
# Likewise a bare (try) or (try BODY).
|
|
if not (handlers or finalbody):
|
|
raise HyTypeError(
|
|
expr,
|
|
"`try' must have an `except' or `finally' clause")
|
|
|
|
returnable = Result(
|
|
expr=asty.Name(expr, id=return_var.id, ctx=ast.Load()),
|
|
temp_variables=[return_var],
|
|
contains_yield=body.contains_yield)
|
|
body += body.expr_as_stmt() if orelse else asty.Assign(
|
|
expr, targets=[return_var], value=body.force_expr)
|
|
body = body.stmts or [asty.Pass(expr)]
|
|
|
|
if PY3:
|
|
# Python 3.3 features a merge of TryExcept+TryFinally into Try.
|
|
x = asty.Try(
|
|
expr,
|
|
body=body,
|
|
handlers=handlers,
|
|
orelse=orelse,
|
|
finalbody=finalbody)
|
|
elif finalbody and handlers:
|
|
x = asty.TryFinally(
|
|
expr,
|
|
body=[asty.TryExcept(
|
|
expr,
|
|
body=body,
|
|
handlers=handlers,
|
|
orelse=orelse)],
|
|
finalbody=finalbody)
|
|
elif finalbody:
|
|
x = asty.TryFinally(
|
|
expr, body=body, finalbody=finalbody)
|
|
else:
|
|
x = asty.TryExcept(
|
|
expr, body=body, handlers=handlers, orelse=orelse)
|
|
return handler_results + x + returnable
|
|
|
|
def _compile_catch_expression(self, expr, var, exceptions, body):
|
|
# exceptions catch should be either:
|
|
# [[list of exceptions]]
|
|
# or
|
|
# [variable [list of exceptions]]
|
|
# or
|
|
# [variable exception]
|
|
# or
|
|
# [exception]
|
|
# or
|
|
# []
|
|
|
|
name = None
|
|
if len(exceptions) == 2:
|
|
name = exceptions[0]
|
|
name = (ast_str(name) if PY3
|
|
else self._storeize(name, self.compile(name)))
|
|
|
|
exceptions_list = exceptions[-1] if exceptions else HyList()
|
|
if isinstance(exceptions_list, HyList):
|
|
if len(exceptions_list):
|
|
# [FooBar BarFoo] → catch Foobar and BarFoo exceptions
|
|
elts, types, _ = self._compile_collect(exceptions_list)
|
|
types += asty.Tuple(exceptions_list, elts=elts, ctx=ast.Load())
|
|
else:
|
|
# [] → all exceptions caught
|
|
types = Result()
|
|
else:
|
|
types = self.compile(exceptions_list)
|
|
|
|
body = self._compile_branch(body)
|
|
body += asty.Assign(expr, targets=[var], value=body.force_expr)
|
|
body += body.expr_as_stmt()
|
|
|
|
return types + asty.ExceptHandler(
|
|
expr, type=types.expr, name=name,
|
|
body=body.stmts or [asty.Pass(expr)])
|
|
|
|
@special("if*", [FORM, FORM, maybe(FORM)])
|
|
def compile_if(self, expr, _, cond, body, orel_expr):
|
|
cond = self.compile(cond)
|
|
body = self.compile(body)
|
|
|
|
nested = root = False
|
|
orel = Result()
|
|
if orel_expr is not None:
|
|
if isinstance(orel_expr, HyExpression) and isinstance(orel_expr[0],
|
|
HySymbol) and orel_expr[0] == 'if*':
|
|
# Nested ifs: don't waste temporaries
|
|
root = self.temp_if is None
|
|
nested = True
|
|
self.temp_if = self.temp_if or self.get_anon_var()
|
|
orel = self.compile(orel_expr)
|
|
|
|
if not cond.stmts and isinstance(cond.force_expr, ast.Name):
|
|
name = cond.force_expr.id
|
|
branch = None
|
|
if name == 'True':
|
|
branch = body
|
|
elif name in ('False', 'None'):
|
|
branch = orel
|
|
if branch is not None:
|
|
if self.temp_if and branch.stmts:
|
|
name = asty.Name(expr,
|
|
id=ast_str(self.temp_if),
|
|
ctx=ast.Store())
|
|
|
|
branch += asty.Assign(expr,
|
|
targets=[name],
|
|
value=body.force_expr)
|
|
|
|
return branch
|
|
|
|
# We want to hoist the statements from the condition
|
|
ret = cond
|
|
|
|
if body.stmts or orel.stmts:
|
|
# We have statements in our bodies
|
|
# Get a temporary variable for the result storage
|
|
var = self.temp_if or self.get_anon_var()
|
|
name = asty.Name(expr,
|
|
id=ast_str(var),
|
|
ctx=ast.Store())
|
|
|
|
# Store the result of the body
|
|
body += asty.Assign(expr,
|
|
targets=[name],
|
|
value=body.force_expr)
|
|
|
|
# and of the else clause
|
|
if not nested or not orel.stmts or (not root and
|
|
var != self.temp_if):
|
|
orel += asty.Assign(expr,
|
|
targets=[name],
|
|
value=orel.force_expr)
|
|
|
|
# Then build the if
|
|
ret += asty.If(expr,
|
|
test=ret.force_expr,
|
|
body=body.stmts,
|
|
orelse=orel.stmts)
|
|
|
|
# And make our expression context our temp variable
|
|
expr_name = asty.Name(expr, id=ast_str(var), ctx=ast.Load())
|
|
|
|
ret += Result(expr=expr_name, temp_variables=[expr_name, name])
|
|
else:
|
|
# Just make that an if expression
|
|
ret += asty.IfExp(expr,
|
|
test=ret.force_expr,
|
|
body=body.force_expr,
|
|
orelse=orel.force_expr)
|
|
|
|
if root:
|
|
self.temp_if = None
|
|
|
|
return ret
|
|
|
|
@special(["break", "continue"], [])
|
|
def compile_break_or_continue_expression(self, expr, root):
|
|
return (asty.Break if root == "break" else asty.Continue)(expr)
|
|
|
|
@special("assert", [FORM, maybe(FORM)])
|
|
def compile_assert_expression(self, expr, root, test, msg):
|
|
ret = self.compile(test)
|
|
e = ret.force_expr
|
|
if msg is not None:
|
|
msg = self.compile(msg).force_expr
|
|
return ret + asty.Assert(expr, test=e, msg=msg)
|
|
|
|
@special(["global", (PY3, "nonlocal")], [oneplus(SYM)])
|
|
def compile_global_or_nonlocal(self, expr, root, syms):
|
|
node = asty.Global if root == "global" else asty.Nonlocal
|
|
return node(expr, names=list(map(ast_str, syms)))
|
|
|
|
@special("yield", [maybe(FORM)])
|
|
def compile_yield_expression(self, expr, root, arg):
|
|
ret = Result(contains_yield=(not PY3))
|
|
if arg is not None:
|
|
ret += self.compile(arg)
|
|
return ret + asty.Yield(expr, value=ret.force_expr)
|
|
|
|
@special([(PY3, "yield-from"), (PY35, "await")], [FORM])
|
|
def compile_yield_from_or_await_expression(self, expr, root, arg):
|
|
ret = Result() + self.compile(arg)
|
|
node = asty.YieldFrom if root == "yield-from" else asty.Await
|
|
return ret + node(expr, value=ret.force_expr)
|
|
|
|
@special("get", [FORM, oneplus(FORM)])
|
|
def compile_index_expression(self, expr, name, obj, indices):
|
|
indices, ret, _ = self._compile_collect(indices)
|
|
ret += self.compile(obj)
|
|
|
|
for ix in indices:
|
|
ret += asty.Subscript(
|
|
expr,
|
|
value=ret.force_expr,
|
|
slice=ast.Index(value=ix),
|
|
ctx=ast.Load())
|
|
|
|
return ret
|
|
|
|
@special(".", [FORM, many(SYM | brackets(FORM))])
|
|
def compile_attribute_access(self, expr, name, invocant, keys):
|
|
ret = self.compile(invocant)
|
|
|
|
for attr in keys:
|
|
if isinstance(attr, HySymbol):
|
|
ret += asty.Attribute(attr,
|
|
value=ret.force_expr,
|
|
attr=ast_str(attr),
|
|
ctx=ast.Load())
|
|
else: # attr is a HyList
|
|
compiled_attr = self.compile(attr[0])
|
|
ret = compiled_attr + ret + asty.Subscript(
|
|
attr,
|
|
value=ret.force_expr,
|
|
slice=ast.Index(value=compiled_attr.force_expr),
|
|
ctx=ast.Load())
|
|
|
|
return ret
|
|
|
|
@special("del", [many(FORM)])
|
|
def compile_del_expression(self, expr, name, args):
|
|
if not args:
|
|
return asty.Pass(expr)
|
|
|
|
del_targets = []
|
|
ret = Result()
|
|
for target in args:
|
|
compiled_target = self.compile(target)
|
|
ret += compiled_target
|
|
del_targets.append(self._storeize(target, compiled_target,
|
|
ast.Del))
|
|
|
|
return ret + asty.Delete(expr, targets=del_targets)
|
|
|
|
@special("cut", [FORM, maybe(FORM), maybe(FORM), maybe(FORM)])
|
|
def compile_cut_expression(self, expr, name, obj, lower, upper, step):
|
|
ret = [Result()]
|
|
def c(e):
|
|
ret[0] += self.compile(e)
|
|
return ret[0].force_expr
|
|
|
|
s = asty.Subscript(
|
|
expr,
|
|
value=c(obj),
|
|
slice=ast.Slice(lower=c(lower), upper=c(upper), step=c(step)),
|
|
ctx=ast.Load())
|
|
return ret[0] + s
|
|
|
|
@special("with-decorator", [oneplus(FORM)])
|
|
def compile_decorate_expression(self, expr, name, args):
|
|
decs, fn = args[:-1], self.compile(args[-1])
|
|
if not fn.stmts or not isinstance(fn.stmts[-1], _decoratables):
|
|
raise HyTypeError(args[-1], "Decorated a non-function")
|
|
decs, ret, _ = self._compile_collect(decs)
|
|
fn.stmts[-1].decorator_list = decs + fn.stmts[-1].decorator_list
|
|
return ret + fn
|
|
|
|
@special(["with*", (PY35, "with/a*")],
|
|
[brackets(FORM, maybe(FORM)), many(FORM)])
|
|
def compile_with_expression(self, expr, root, args, body):
|
|
thing, ctx = (None, args[0]) if args[1] is None else args
|
|
if thing is not None:
|
|
thing = self._storeize(thing, self.compile(thing))
|
|
ctx = self.compile(ctx)
|
|
|
|
body = self._compile_branch(body)
|
|
|
|
# Store the result of the body in a tempvar
|
|
var = self.get_anon_var()
|
|
name = asty.Name(expr, id=ast_str(var), ctx=ast.Store())
|
|
body += asty.Assign(expr, targets=[name], value=body.force_expr)
|
|
# Initialize the tempvar to None in case the `with` exits
|
|
# early with an exception.
|
|
initial_assign = asty.Assign(
|
|
expr, targets=[name], value=asty.Name(
|
|
expr, id=ast_str("None"), ctx=ast.Load()))
|
|
|
|
node = asty.With if root == "with*" else asty.AsyncWith
|
|
the_with = node(expr,
|
|
context_expr=ctx.force_expr,
|
|
optional_vars=thing,
|
|
body=body.stmts)
|
|
|
|
if PY3:
|
|
the_with.items = [ast.withitem(context_expr=ctx.force_expr,
|
|
optional_vars=thing)]
|
|
|
|
ret = Result(stmts=[initial_assign]) + ctx + the_with
|
|
ret.contains_yield = ret.contains_yield or body.contains_yield
|
|
# And make our expression context our temp variable
|
|
expr_name = asty.Name(expr, id=ast_str(var), ctx=ast.Load())
|
|
|
|
ret += Result(expr=expr_name)
|
|
# We don't give the Result any temp_vars because we don't want
|
|
# Result.rename to touch `name`. Otherwise, initial_assign will
|
|
# clobber any preexisting value of the renamed-to variable.
|
|
|
|
return ret
|
|
|
|
@special(",", [many(FORM)])
|
|
def compile_tuple(self, expr, root, args):
|
|
elts, ret, _ = self._compile_collect(args)
|
|
return ret + asty.Tuple(expr, elts=elts, ctx=ast.Load())
|
|
|
|
_loopers = many(
|
|
tag('setv', sym(":setv") + FORM + FORM) |
|
|
tag('if', sym(":if") + FORM) |
|
|
tag('do', sym(":do") + FORM) |
|
|
tag('afor', sym(":async") + FORM + FORM) |
|
|
tag('for', FORM + FORM))
|
|
@special(["for"], [brackets(_loopers),
|
|
many(notpexpr("else")) + maybe(dolike("else"))])
|
|
@special(["lfor", "sfor", "gfor"], [_loopers, FORM])
|
|
@special(["dfor"], [_loopers, brackets(FORM, FORM)])
|
|
def compile_comprehension(self, expr, root, parts, final):
|
|
node_class = {
|
|
"for": asty.For,
|
|
"lfor": asty.ListComp,
|
|
"dfor": asty.DictComp,
|
|
"sfor": asty.SetComp,
|
|
"gfor": asty.GeneratorExp}[root]
|
|
is_for = root == "for"
|
|
|
|
orel = []
|
|
if is_for:
|
|
# Get the `else`.
|
|
body, else_expr = final
|
|
if else_expr is not None:
|
|
orel.append(self._compile_branch(else_expr))
|
|
orel[0] += orel[0].expr_as_stmt()
|
|
else:
|
|
# Get the final value (and for dictionary
|
|
# comprehensions, the final key).
|
|
if node_class is asty.DictComp:
|
|
key, elt = map(self.compile, final)
|
|
else:
|
|
key = None
|
|
elt = self.compile(final)
|
|
|
|
# Compile the parts.
|
|
if is_for:
|
|
parts = parts[0]
|
|
if not parts:
|
|
return Result(expr=ast.parse({
|
|
asty.For: "None",
|
|
asty.ListComp: "[]",
|
|
asty.DictComp: "{}",
|
|
asty.SetComp: "{1}.__class__()",
|
|
asty.GeneratorExp: "(_ for _ in [])"}[node_class]).body[0].value)
|
|
parts = [
|
|
Tag(p.tag, self.compile(p.value) if p.tag in ["if", "do"] else [
|
|
self._storeize(p.value[0], self.compile(p.value[0])),
|
|
self.compile(p.value[1])])
|
|
for p in parts]
|
|
|
|
# Produce a result.
|
|
if (is_for or elt.stmts or (key is not None and key.stmts) or
|
|
any(p.tag == 'do' or (p.value[1].stmts if p.tag in ("for", "afor", "setv") else p.value.stmts)
|
|
for p in parts)):
|
|
# The desired comprehension can't be expressed as a
|
|
# real Python comprehension. We'll write it as a nested
|
|
# loop in a function instead.
|
|
contains_yield = []
|
|
def f(parts):
|
|
# This function is called recursively to construct
|
|
# the nested loop.
|
|
if not parts:
|
|
if is_for:
|
|
if body:
|
|
bd = self._compile_branch(body)
|
|
if bd.contains_yield:
|
|
contains_yield.append(True)
|
|
return bd + bd.expr_as_stmt()
|
|
return Result(stmts=[asty.Pass(expr)])
|
|
if node_class is asty.DictComp:
|
|
ret = key + elt
|
|
val = asty.Tuple(
|
|
key, ctx=ast.Load(),
|
|
elts=[key.force_expr, elt.force_expr])
|
|
else:
|
|
ret = elt
|
|
val = elt.force_expr
|
|
return ret + asty.Expr(
|
|
elt, value=asty.Yield(elt, value=val))
|
|
(tagname, v), parts = parts[0], parts[1:]
|
|
if tagname in ("for", "afor"):
|
|
orelse = orel and orel.pop().stmts
|
|
node = asty.AsyncFor if tagname == "afor" else asty.For
|
|
return v[1] + node(
|
|
v[1], target=v[0], iter=v[1].force_expr, body=f(parts).stmts,
|
|
orelse=orelse)
|
|
elif tagname == "setv":
|
|
return v[1] + asty.Assign(
|
|
v[1], targets=[v[0]], value=v[1].force_expr) + f(parts)
|
|
elif tagname == "if":
|
|
return v + asty.If(
|
|
v, test=v.force_expr, body=f(parts).stmts, orelse=[])
|
|
elif tagname == "do":
|
|
return v + v.expr_as_stmt() + f(parts)
|
|
else:
|
|
raise ValueError("can't happen")
|
|
if is_for:
|
|
ret = f(parts)
|
|
ret.contains_yield = bool(contains_yield)
|
|
return ret
|
|
fname = self.get_anon_var()
|
|
# Define the generator function.
|
|
ret = Result() + asty.FunctionDef(
|
|
expr,
|
|
name=fname,
|
|
args=ast.arguments(
|
|
args=[], vararg=None, kwarg=None,
|
|
kwonlyargs=[], kw_defaults=[], defaults=[]),
|
|
body=f(parts).stmts,
|
|
decorator_list=[])
|
|
# Immediately call the new function. Unless the user asked
|
|
# for a generator, wrap the call in `[].__class__(...)` or
|
|
# `{}.__class__(...)` or `{1}.__class__(...)` to get the
|
|
# right type. We don't want to just use e.g. `list(...)`
|
|
# because the name `list` might be rebound.
|
|
return ret + Result(expr=ast.parse(
|
|
"{}({}())".format(
|
|
{asty.ListComp: "[].__class__",
|
|
asty.DictComp: "{}.__class__",
|
|
asty.SetComp: "{1}.__class__",
|
|
asty.GeneratorExp: ""}[node_class],
|
|
fname)).body[0].value)
|
|
|
|
# We can produce a real comprehension.
|
|
generators = []
|
|
for tagname, v in parts:
|
|
if tagname in ("for", "afor"):
|
|
generators.append(ast.comprehension(
|
|
target=v[0], iter=v[1].expr, ifs=[],
|
|
is_async=int(tagname == "afor")))
|
|
elif tagname == "setv":
|
|
generators.append(ast.comprehension(
|
|
target=v[0],
|
|
iter=asty.Tuple(v[1], elts=[v[1].expr], ctx=ast.Load()),
|
|
ifs=[], is_async=0))
|
|
elif tagname == "if":
|
|
generators[-1].ifs.append(v.expr)
|
|
else:
|
|
raise ValueError("can't happen")
|
|
if node_class is asty.DictComp:
|
|
return asty.DictComp(expr, key=key.expr, value=elt.expr, generators=generators)
|
|
return node_class(expr, elt=elt.expr, generators=generators)
|
|
|
|
@special(["not", "~"], [FORM])
|
|
def compile_unary_operator(self, expr, root, arg):
|
|
ops = {"not": ast.Not,
|
|
"~": ast.Invert}
|
|
operand = self.compile(arg)
|
|
return operand + asty.UnaryOp(
|
|
expr, op=ops[root](), operand=operand.force_expr)
|
|
|
|
_symn = some(lambda x: isinstance(x, HySymbol) and "." not in x)
|
|
|
|
@special(["import", "require"], [many(
|
|
SYM |
|
|
brackets(SYM, sym(":as"), _symn) |
|
|
brackets(SYM, brackets(many(_symn + maybe(sym(":as") + _symn)))))])
|
|
def compile_import_or_require(self, expr, root, entries):
|
|
"""
|
|
TODO for `require`: keep track of what we've imported in this run and
|
|
then "unimport" it after we've completed `thing' so that we don't
|
|
pollute other envs.
|
|
"""
|
|
ret = Result()
|
|
|
|
for entry in entries:
|
|
assignments = "ALL"
|
|
prefix = ""
|
|
|
|
if isinstance(entry, HySymbol):
|
|
# e.g., (import foo)
|
|
module, prefix = entry, entry
|
|
elif isinstance(entry, HyList) and isinstance(entry[1], HySymbol):
|
|
# e.g., (import [foo :as bar])
|
|
module, prefix = entry
|
|
else:
|
|
# e.g., (import [foo [bar baz :as MyBaz bing]])
|
|
# or (import [foo [*]])
|
|
module, kids = entry
|
|
kids = kids[0]
|
|
if (HySymbol('*'), None) in kids:
|
|
if len(kids) != 1:
|
|
star = kids[kids.index((HySymbol('*'), None))][0]
|
|
raise HyTypeError(star, "* in an import name list "
|
|
"must be on its own")
|
|
else:
|
|
assignments = [(k, v or k) for k, v in kids]
|
|
|
|
if root == "import":
|
|
ast_module = ast_str(module, piecewise=True)
|
|
module = ast_module.lstrip(".")
|
|
level = len(ast_module) - len(module)
|
|
if assignments == "ALL" and prefix == "":
|
|
node = asty.ImportFrom
|
|
names = [ast.alias(name="*", asname=None)]
|
|
elif assignments == "ALL":
|
|
node = asty.Import
|
|
prefix = ast_str(prefix, piecewise=True)
|
|
names = [ast.alias(
|
|
name=ast_module,
|
|
asname=prefix if prefix != module else None)]
|
|
else:
|
|
node = asty.ImportFrom
|
|
names = [
|
|
ast.alias(
|
|
name=ast_str(k),
|
|
asname=None if v == k else ast_str(v))
|
|
for k, v in assignments]
|
|
ret += node(
|
|
expr, module=module or None, names=names, level=level)
|
|
else: # root == "require"
|
|
__import__(module)
|
|
require(module, self.module_name,
|
|
assignments=assignments, prefix=prefix)
|
|
|
|
return ret
|
|
|
|
@special(["and", "or"], [many(FORM)])
|
|
def compile_logical_or_and_and_operator(self, expr, operator, args):
|
|
ops = {"and": (ast.And, "True"),
|
|
"or": (ast.Or, "None")}
|
|
opnode, default = ops[operator]
|
|
osym = expr[0]
|
|
if len(args) == 0:
|
|
return asty.Name(osym, id=default, ctx=ast.Load())
|
|
elif len(args) == 1:
|
|
return self.compile(args[0])
|
|
ret = Result()
|
|
values = list(map(self.compile, args))
|
|
if any(value.stmts for value in values):
|
|
# Compile it to an if...else sequence
|
|
var = self.get_anon_var()
|
|
name = asty.Name(osym, id=var, ctx=ast.Store())
|
|
expr_name = asty.Name(osym, id=var, ctx=ast.Load())
|
|
temp_variables = [name, expr_name]
|
|
|
|
def make_assign(value, node=None):
|
|
positioned_name = asty.Name(
|
|
node or osym, id=var, ctx=ast.Store())
|
|
temp_variables.append(positioned_name)
|
|
return asty.Assign(
|
|
node or osym, targets=[positioned_name], value=value)
|
|
|
|
current = root = []
|
|
for i, value in enumerate(values):
|
|
if value.stmts:
|
|
node = value.stmts[0]
|
|
current.extend(value.stmts)
|
|
else:
|
|
node = value.expr
|
|
current.append(make_assign(value.force_expr, value.force_expr))
|
|
if i == len(values)-1:
|
|
# Skip a redundant 'if'.
|
|
break
|
|
if operator == "and":
|
|
cond = expr_name
|
|
elif operator == "or":
|
|
cond = asty.UnaryOp(node, op=ast.Not(), operand=expr_name)
|
|
current.append(asty.If(node, test=cond, body=[], orelse=[]))
|
|
current = current[-1].body
|
|
ret = sum(root, ret)
|
|
ret += Result(expr=expr_name, temp_variables=temp_variables)
|
|
else:
|
|
ret += asty.BoolOp(osym,
|
|
op=opnode(),
|
|
values=[value.force_expr for value in values])
|
|
return ret
|
|
|
|
c_ops = {"=": ast.Eq, "!=": ast.NotEq,
|
|
"<": ast.Lt, "<=": ast.LtE,
|
|
">": ast.Gt, ">=": ast.GtE,
|
|
"is": ast.Is, "is-not": ast.IsNot,
|
|
"in": ast.In, "not-in": ast.NotIn}
|
|
c_ops = {ast_str(k): v for k, v in c_ops.items()}
|
|
|
|
@special(["=", "is", "<", "<=", ">", ">="], [oneplus(FORM)])
|
|
@special(["!=", "is-not"], [times(2, Inf, FORM)])
|
|
@special(["in", "not-in"], [times(2, 2, FORM)])
|
|
def compile_compare_op_expression(self, expr, root, args):
|
|
if len(args) == 1:
|
|
return (self.compile(args[0]) +
|
|
asty.Name(expr, id="True", ctx=ast.Load()))
|
|
|
|
ops = [self.c_ops[ast_str(root)]() for _ in args[1:]]
|
|
exprs, ret, _ = self._compile_collect(args)
|
|
return ret + asty.Compare(
|
|
expr, left=exprs[0], ops=ops, comparators=exprs[1:])
|
|
|
|
m_ops = {"+": ast.Add,
|
|
"/": ast.Div,
|
|
"//": ast.FloorDiv,
|
|
"*": ast.Mult,
|
|
"-": ast.Sub,
|
|
"%": ast.Mod,
|
|
"**": ast.Pow,
|
|
"<<": ast.LShift,
|
|
">>": ast.RShift,
|
|
"|": ast.BitOr,
|
|
"^": ast.BitXor,
|
|
"&": ast.BitAnd}
|
|
if PY35:
|
|
m_ops["@"] = ast.MatMult
|
|
|
|
@special(["+", "*", "|"], [many(FORM)])
|
|
@special(["-", "/", "&", (PY35, "@")], [oneplus(FORM)])
|
|
@special(["**", "//", "<<", ">>"], [times(2, Inf, FORM)])
|
|
@special(["%", "^"], [times(2, 2, FORM)])
|
|
def compile_maths_expression(self, expr, root, args):
|
|
if len(args) == 0:
|
|
# Return the identity element for this operator.
|
|
return asty.Num(expr, n=long_type(
|
|
{"+": 0, "|": 0, "*": 1}[root]))
|
|
|
|
if len(args) == 1:
|
|
if root == "/":
|
|
# Compute the reciprocal of the argument.
|
|
args = [HyInteger(1).replace(expr), args[0]]
|
|
elif root in ("+", "-"):
|
|
# Apply unary plus or unary minus to the argument.
|
|
op = {"+": ast.UAdd, "-": ast.USub}[root]()
|
|
ret = self.compile(args[0])
|
|
return ret + asty.UnaryOp(expr, op=op, operand=ret.force_expr)
|
|
else:
|
|
# Return the argument unchanged.
|
|
return self.compile(args[0])
|
|
|
|
op = self.m_ops[root]
|
|
right_associative = root == "**"
|
|
ret = self.compile(args[-1 if right_associative else 0])
|
|
for child in args[-2 if right_associative else 1 ::
|
|
-1 if right_associative else 1]:
|
|
left_expr = ret.force_expr
|
|
ret += self.compile(child)
|
|
right_expr = ret.force_expr
|
|
if right_associative:
|
|
left_expr, right_expr = right_expr, left_expr
|
|
ret += asty.BinOp(expr, left=left_expr, op=op(), right=right_expr)
|
|
|
|
return ret
|
|
|
|
a_ops = {x + "=": v for x, v in m_ops.items()}
|
|
|
|
@special(list(a_ops.keys()), [FORM, FORM])
|
|
def compile_augassign_expression(self, expr, root, target, value):
|
|
op = self.a_ops[root]
|
|
target = self._storeize(target, self.compile(target))
|
|
ret = self.compile(value)
|
|
return ret + asty.AugAssign(
|
|
expr, target=target, value=ret.force_expr, op=op())
|
|
|
|
@special("setv", [many(FORM + FORM)])
|
|
def compile_def_expression(self, expr, root, pairs):
|
|
if not pairs:
|
|
return asty.Name(expr, id='None', ctx=ast.Load())
|
|
result = Result()
|
|
for pair in pairs:
|
|
result += self._compile_assign(*pair)
|
|
return result
|
|
|
|
def _compile_assign(self, name, result):
|
|
|
|
str_name = "%s" % name
|
|
if str_name in (["None"] + (["True", "False"] if PY3 else [])):
|
|
# Python 2 allows assigning to True and False, although
|
|
# this is rarely wise.
|
|
raise HyTypeError(name,
|
|
"Can't assign to `%s'" % str_name)
|
|
|
|
result = self.compile(result)
|
|
ld_name = self.compile(name)
|
|
|
|
if isinstance(ld_name.expr, ast.Call):
|
|
raise HyTypeError(name,
|
|
"Can't assign to a callable: `%s'" % str_name)
|
|
|
|
if (result.temp_variables
|
|
and isinstance(name, HySymbol)
|
|
and '.' not in name):
|
|
result.rename(name)
|
|
# Throw away .expr to ensure that (setv ...) returns None.
|
|
result.expr = None
|
|
else:
|
|
st_name = self._storeize(name, ld_name)
|
|
result += asty.Assign(
|
|
name if hasattr(name, "start_line") else result,
|
|
targets=[st_name],
|
|
value=result.force_expr)
|
|
|
|
return result
|
|
|
|
@special(["while"], [FORM, many(notpexpr("else")), maybe(dolike("else"))])
|
|
def compile_while_expression(self, expr, root, cond, body, else_expr):
|
|
cond_compiled = self.compile(cond)
|
|
|
|
if cond_compiled.stmts:
|
|
# We need to ensure the statements for the condition are
|
|
# executed on every iteration. Rewrite the loop to use a
|
|
# single anonymous variable as the condition.
|
|
def e(*x): return HyExpression(x)
|
|
s = HySymbol
|
|
cond_var = s(self.get_anon_var())
|
|
return self.compile(e(
|
|
s('do'),
|
|
e(s('setv'), cond_var, 1),
|
|
e(s('while'), cond_var,
|
|
# Cast the condition to a bool in case it's mutable and
|
|
# changes its truth value, but use (not (not ...)) instead of
|
|
# `bool` in case `bool` has been redefined.
|
|
e(s('setv'), cond_var, e(s('not'), e(s('not'), cond))),
|
|
e(s('if*'), cond_var, e(s('do'), *body)),
|
|
*([e(s('else'), *else_expr)] if else_expr is not None else []))).replace(expr)) # noqa
|
|
|
|
orel = Result()
|
|
if else_expr is not None:
|
|
orel = self._compile_branch(else_expr)
|
|
orel += orel.expr_as_stmt()
|
|
|
|
body = self._compile_branch(body)
|
|
body += body.expr_as_stmt()
|
|
|
|
ret = cond_compiled + asty.While(
|
|
expr, test=cond_compiled.force_expr,
|
|
body=body.stmts or [asty.Pass(expr)],
|
|
orelse=orel.stmts)
|
|
ret.contains_yield = body.contains_yield
|
|
|
|
return ret
|
|
|
|
NASYM = some(lambda x: isinstance(x, HySymbol) and x not in (
|
|
"&optional", "&rest", "&kwonly", "&kwargs"))
|
|
@special(["fn", "fn*", (PY35, "fn/a")], [
|
|
# The starred version is for internal use (particularly, in the
|
|
# definition of `defn`). It ensures that a FunctionDef is
|
|
# produced rather than a Lambda.
|
|
brackets(
|
|
many(NASYM),
|
|
maybe(sym("&optional") + many(NASYM | brackets(SYM, FORM))),
|
|
maybe(sym("&rest") + NASYM),
|
|
maybe(sym("&kwonly") + many(NASYM | brackets(SYM, FORM))),
|
|
maybe(sym("&kwargs") + NASYM)),
|
|
many(FORM)])
|
|
def compile_function_def(self, expr, root, params, body):
|
|
|
|
force_functiondef = root in ("fn*", "fn/a")
|
|
node = asty.AsyncFunctionDef if root == "fn/a" else asty.FunctionDef
|
|
|
|
mandatory, optional, rest, kwonly, kwargs = params
|
|
optional, defaults, ret = self._parse_optional_args(optional)
|
|
if kwonly is not None and not PY3:
|
|
raise HyTypeError(params, "&kwonly parameters require Python 3")
|
|
kwonly, kw_defaults, ret2 = self._parse_optional_args(kwonly, True)
|
|
ret += ret2
|
|
main_args = mandatory + optional
|
|
|
|
if PY3:
|
|
# Python 3.4+ requires that args are an ast.arg object, rather
|
|
# than an ast.Name or bare string.
|
|
main_args, kwonly, [rest], [kwargs] = (
|
|
[[x and asty.arg(x, arg=ast_str(x), annotation=None)
|
|
for x in o]
|
|
for o in (main_args or [], kwonly or [], [rest], [kwargs])])
|
|
else:
|
|
main_args = [asty.Name(x, id=ast_str(x), ctx=ast.Param())
|
|
for x in main_args]
|
|
rest = rest and ast_str(rest)
|
|
kwargs = kwargs and ast_str(kwargs)
|
|
|
|
args = ast.arguments(
|
|
args=main_args, defaults=defaults,
|
|
vararg=rest,
|
|
kwonlyargs=kwonly, kw_defaults=kw_defaults,
|
|
kwarg=kwargs)
|
|
|
|
body = self._compile_branch(body)
|
|
|
|
if not force_functiondef and not body.stmts:
|
|
return ret + asty.Lambda(expr, args=args, body=body.force_expr)
|
|
|
|
if body.expr:
|
|
if body.contains_yield and not PY3:
|
|
# Prior to PEP 380 (introduced in Python 3.3)
|
|
# generators may not have a value in a return
|
|
# statement.
|
|
body += body.expr_as_stmt()
|
|
else:
|
|
body += asty.Return(body.expr, value=body.expr)
|
|
|
|
name = self.get_anon_var()
|
|
|
|
ret += node(expr,
|
|
name=name,
|
|
args=args,
|
|
body=body.stmts or [asty.Pass(expr)],
|
|
decorator_list=[])
|
|
|
|
ast_name = asty.Name(expr, id=name, ctx=ast.Load())
|
|
ret += Result(expr=ast_name, temp_variables=[ast_name, ret.stmts[-1]])
|
|
return ret
|
|
|
|
def _parse_optional_args(self, expr, allow_no_default=False):
|
|
# [a b [c 5] d] → ([a, b, c, d], [None, None, 5, d], <ret>)
|
|
names, defaults, ret = [], [], Result()
|
|
for x in expr or []:
|
|
sym, value = (
|
|
x if isinstance(x, HyList)
|
|
else (x, None) if allow_no_default
|
|
else (x, HySymbol('None').replace(x)))
|
|
names.append(sym)
|
|
if value is None:
|
|
defaults.append(None)
|
|
else:
|
|
ret += self.compile(value)
|
|
defaults.append(ret.force_expr)
|
|
return names, defaults, ret
|
|
|
|
@special("return", [maybe(FORM)])
|
|
def compile_return(self, expr, root, arg):
|
|
ret = Result()
|
|
if arg is None:
|
|
return asty.Return(expr, value=None)
|
|
ret += self.compile(arg)
|
|
return ret + asty.Return(expr, value=ret.force_expr)
|
|
|
|
@special("defclass", [
|
|
SYM,
|
|
maybe(brackets(many(FORM)) + maybe(STR) +
|
|
maybe(brackets(many(SYM + FORM))) + many(FORM))])
|
|
def compile_class_expression(self, expr, root, name, rest):
|
|
base_list, docstring, attrs, body = rest or ([[]], None, None, [])
|
|
|
|
bases_expr, bases, keywords = (
|
|
self._compile_collect(base_list[0], with_kwargs=PY3))
|
|
|
|
bodyr = Result()
|
|
|
|
if docstring is not None:
|
|
bodyr += self.compile(docstring).expr_as_stmt()
|
|
|
|
if attrs is not None:
|
|
bodyr += self.compile(self._rewire_init(HyExpression(
|
|
[HySymbol("setv")] +
|
|
[x for pair in attrs[0] for x in pair]).replace(attrs)))
|
|
|
|
for e in body:
|
|
e = self.compile(self._rewire_init(macroexpand(e, self)))
|
|
bodyr += e + e.expr_as_stmt()
|
|
|
|
return bases + asty.ClassDef(
|
|
expr,
|
|
decorator_list=[],
|
|
name=ast_str(name),
|
|
keywords=keywords,
|
|
starargs=None,
|
|
kwargs=None,
|
|
bases=bases_expr,
|
|
body=bodyr.stmts or [asty.Pass(expr)])
|
|
|
|
def _rewire_init(self, expr):
|
|
"Given a (setv …) form, append None to definitions of __init__."
|
|
|
|
if not (isinstance(expr, HyExpression)
|
|
and len(expr) > 1
|
|
and isinstance(expr[0], HySymbol)
|
|
and expr[0] == HySymbol("setv")):
|
|
return expr
|
|
|
|
new_args = []
|
|
pairs = list(expr[1:])
|
|
while pairs:
|
|
k, v = (pairs.pop(0), pairs.pop(0))
|
|
if ast_str(k) == "__init__" and isinstance(v, HyExpression):
|
|
v += HyExpression([HySymbol("None")])
|
|
new_args.extend([k, v])
|
|
return HyExpression([HySymbol("setv")] + new_args).replace(expr)
|
|
|
|
@special("dispatch-tag-macro", [STR, FORM])
|
|
def compile_dispatch_tag_macro(self, expr, root, tag, arg):
|
|
return self.compile(tag_macroexpand(
|
|
HyString(mangle(tag)).replace(tag),
|
|
arg,
|
|
self))
|
|
|
|
_namespaces = {}
|
|
|
|
@special(["eval-and-compile", "eval-when-compile"], [many(FORM)])
|
|
def compile_eval_and_compile(self, expr, root, body):
|
|
new_expr = HyExpression([HySymbol("do").replace(expr[0])]).replace(expr)
|
|
if self.module_name not in self._namespaces:
|
|
# Initialize a compile-time namespace for this module.
|
|
self._namespaces[self.module_name] = {
|
|
'hy': hy, '__name__': self.module_name}
|
|
hy.importer.hy_eval(new_expr + body,
|
|
self._namespaces[self.module_name],
|
|
self.module_name)
|
|
return (self._compile_branch(body)
|
|
if ast_str(root) == "eval_and_compile"
|
|
else Result())
|
|
|
|
@builds_model(HyExpression)
|
|
def compile_expression(self, expr):
|
|
# Perform macro expansions
|
|
expr = macroexpand(expr, self)
|
|
if not isinstance(expr, HyExpression):
|
|
# Go through compile again if the type changed.
|
|
return self.compile(expr)
|
|
|
|
if not expr:
|
|
raise HyTypeError(
|
|
expr, "empty expressions are not allowed at top level")
|
|
|
|
args = list(expr)
|
|
root = args.pop(0)
|
|
func = None
|
|
|
|
if isinstance(root, HySymbol):
|
|
|
|
# First check if `root` is a special operator, unless it has an
|
|
# `unpack-iterable` in it, since Python's operators (`+`,
|
|
# etc.) can't unpack. An exception to this exception is that
|
|
# tuple literals (`,`) can unpack. Finally, we allow unpacking in
|
|
# `.` forms here so the user gets a better error message.
|
|
sroot = ast_str(root)
|
|
if (sroot in _special_form_compilers or sroot in _bad_roots) and (
|
|
sroot in (mangle(","), mangle(".")) or
|
|
not any(is_unpack("iterable", x) for x in args)):
|
|
if sroot in _bad_roots:
|
|
raise HyTypeError(
|
|
expr,
|
|
"The special form '{}' is not allowed here".format(root))
|
|
# `sroot` is a special operator. Get the build method and
|
|
# pattern-match the arguments.
|
|
build_method, pattern = _special_form_compilers[sroot]
|
|
try:
|
|
parse_tree = pattern.parse(args)
|
|
except NoParseError as e:
|
|
raise HyTypeError(
|
|
expr[min(e.state.pos + 1, len(expr) - 1)],
|
|
"parse error for special form '{}': {}".format(
|
|
root,
|
|
e.msg.replace("<EOF>", "end of form")))
|
|
return Result() + build_method(
|
|
self, expr, unmangle(sroot), *parse_tree)
|
|
|
|
if root.startswith("."):
|
|
# (.split "test test") -> "test test".split()
|
|
# (.a.b.c x v1 v2) -> (.c (. x a b) v1 v2) -> x.a.b.c(v1, v2)
|
|
|
|
# Get the method name (the last named attribute
|
|
# in the chain of attributes)
|
|
attrs = [HySymbol(a).replace(root) for a in root.split(".")[1:]]
|
|
root = attrs.pop()
|
|
|
|
# Get the object we're calling the method on
|
|
# (extracted with the attribute access DSL)
|
|
# Skip past keywords and their arguments.
|
|
try:
|
|
kws, obj, rest = (
|
|
many(KEYWORD + FORM | unpack("mapping")) +
|
|
FORM +
|
|
many(FORM)).parse(args)
|
|
except NoParseError:
|
|
raise HyTypeError(
|
|
expr, "attribute access requires object")
|
|
# Reconstruct `args` to exclude `obj`.
|
|
args = [x for p in kws for x in p] + list(rest)
|
|
if is_unpack("iterable", obj):
|
|
raise HyTypeError(
|
|
obj, "can't call a method on an unpacking form")
|
|
func = self.compile(HyExpression(
|
|
[HySymbol(".").replace(root), obj] +
|
|
attrs))
|
|
|
|
# And get the method
|
|
func += asty.Attribute(root,
|
|
value=func.force_expr,
|
|
attr=ast_str(root),
|
|
ctx=ast.Load())
|
|
|
|
if not func:
|
|
func = self.compile(root)
|
|
|
|
# An exception for pulling together keyword args is if we're doing
|
|
# a typecheck, eg (type :foo)
|
|
with_kwargs = root not in (
|
|
"type", "HyKeyword", "keyword", "name", "keyword?", "identity")
|
|
args, ret, keywords, oldpy_star, oldpy_kw = self._compile_collect(
|
|
args, with_kwargs, oldpy_unpack=True)
|
|
|
|
return func + ret + asty.Call(
|
|
expr, func=func.expr, args=args, keywords=keywords,
|
|
starargs=oldpy_star, kwargs=oldpy_kw)
|
|
|
|
@builds_model(HyInteger, HyFloat, HyComplex)
|
|
def compile_numeric_literal(self, x):
|
|
f = {HyInteger: long_type,
|
|
HyFloat: float,
|
|
HyComplex: complex}[type(x)]
|
|
return asty.Num(x, n=f(x))
|
|
|
|
@builds_model(HySymbol)
|
|
def compile_symbol(self, symbol):
|
|
if "." in symbol:
|
|
glob, local = symbol.rsplit(".", 1)
|
|
|
|
if not glob:
|
|
raise HyTypeError(symbol, 'cannot access attribute on '
|
|
'anything other than a name '
|
|
'(in order to get attributes of '
|
|
'expressions, use '
|
|
'`(. <expression> {attr})` or '
|
|
'`(.{attr} <expression>)`)'.format(
|
|
attr=local))
|
|
|
|
if not local:
|
|
raise HyTypeError(symbol, 'cannot access empty attribute')
|
|
|
|
glob = HySymbol(glob).replace(symbol)
|
|
ret = self.compile_symbol(glob)
|
|
|
|
return asty.Attribute(
|
|
symbol,
|
|
value=ret,
|
|
attr=ast_str(local),
|
|
ctx=ast.Load())
|
|
|
|
if self.can_use_stdlib and ast_str(symbol) in _stdlib:
|
|
self.imports[_stdlib[ast_str(symbol)]].add(ast_str(symbol))
|
|
|
|
return asty.Name(symbol, id=ast_str(symbol), ctx=ast.Load())
|
|
|
|
@builds_model(HyKeyword)
|
|
def compile_keyword(self, obj):
|
|
ret = Result()
|
|
ret += asty.Call(
|
|
obj,
|
|
func=asty.Name(obj, id="HyKeyword", ctx=ast.Load()),
|
|
args=[asty.Str(obj, s=obj.name)],
|
|
keywords=[])
|
|
ret.add_imports("hy", {"HyKeyword"})
|
|
return ret
|
|
|
|
@builds_model(HyString, HyBytes)
|
|
def compile_string(self, string):
|
|
node = asty.Bytes if PY3 and type(string) is HyBytes else asty.Str
|
|
f = bytes_type if type(string) is HyBytes else str_type
|
|
return node(string, s=f(string))
|
|
|
|
@builds_model(HyList, HySet)
|
|
def compile_list(self, expression):
|
|
elts, ret, _ = self._compile_collect(expression)
|
|
node = {HyList: asty.List, HySet: asty.Set}[type(expression)]
|
|
return ret + node(expression, elts=elts, ctx=ast.Load())
|
|
|
|
@builds_model(HyDict)
|
|
def compile_dict(self, m):
|
|
keyvalues, ret, _ = self._compile_collect(m, dict_display=True)
|
|
return ret + asty.Dict(m, keys=keyvalues[::2], values=keyvalues[1::2])
|
|
|
|
|
|
def hy_compile(tree, module_name, root=ast.Module, get_expr=False):
|
|
"""
|
|
Compile a HyObject tree into a Python AST Module.
|
|
|
|
If `get_expr` is True, return a tuple (module, last_expression), where
|
|
`last_expression` is the.
|
|
"""
|
|
|
|
tree = wrap_value(tree)
|
|
if not isinstance(tree, HyObject):
|
|
raise HyCompileError("`tree` must be a HyObject or capable of "
|
|
"being promoted to one")
|
|
|
|
compiler = HyASTCompiler(module_name)
|
|
result = compiler.compile(tree)
|
|
expr = result.force_expr
|
|
|
|
if not get_expr:
|
|
result += result.expr_as_stmt()
|
|
|
|
body = compiler.imports_as_stmts(tree) + result.stmts
|
|
|
|
ret = root(body=body)
|
|
|
|
if get_expr:
|
|
expr = ast.Expression(body=expr)
|
|
ret = (ret, expr)
|
|
|
|
return ret
|