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"""
AST nodes specific to the C family of languages
"""
from sympy.codegen.ast import (
Attribute, Declaration, Node, String, Token, Type, none,
FunctionCall, CodeBlock
)
from sympy.core.basic import Basic
from sympy.core.containers import Tuple
from sympy.core.sympify import sympify
void = Type('void')
restrict = Attribute('restrict') # guarantees no pointer aliasing
volatile = Attribute('volatile')
static = Attribute('static')
def alignof(arg):
""" Generate of FunctionCall instance for calling 'alignof' """
return FunctionCall('alignof', [String(arg) if isinstance(arg, str) else arg])
def sizeof(arg):
""" Generate of FunctionCall instance for calling 'sizeof'
Examples
========
>>> from sympy.codegen.ast import real
>>> from sympy.codegen.cnodes import sizeof
>>> from sympy import ccode
>>> ccode(sizeof(real))
'sizeof(double)'
"""
return FunctionCall('sizeof', [String(arg) if isinstance(arg, str) else arg])
class CommaOperator(Basic):
""" Represents the comma operator in C """
def __new__(cls, *args):
return Basic.__new__(cls, *[sympify(arg) for arg in args])
class Label(Node):
""" Label for use with e.g. goto statement.
Examples
========
>>> from sympy import ccode, Symbol
>>> from sympy.codegen.cnodes import Label, PreIncrement
>>> print(ccode(Label('foo')))
foo:
>>> print(ccode(Label('bar', [PreIncrement(Symbol('a'))])))
bar:
++(a);
"""
__slots__ = _fields = ('name', 'body')
defaults = {'body': none}
_construct_name = String
@classmethod
def _construct_body(cls, itr):
if isinstance(itr, CodeBlock):
return itr
else:
return CodeBlock(*itr)
class goto(Token):
""" Represents goto in C """
__slots__ = _fields = ('label',)
_construct_label = Label
class PreDecrement(Basic):
""" Represents the pre-decrement operator
Examples
========
>>> from sympy.abc import x
>>> from sympy.codegen.cnodes import PreDecrement
>>> from sympy import ccode
>>> ccode(PreDecrement(x))
'--(x)'
"""
nargs = 1
class PostDecrement(Basic):
""" Represents the post-decrement operator """
nargs = 1
class PreIncrement(Basic):
""" Represents the pre-increment operator """
nargs = 1
class PostIncrement(Basic):
""" Represents the post-increment operator """
nargs = 1
class struct(Node):
""" Represents a struct in C """
__slots__ = _fields = ('name', 'declarations')
defaults = {'name': none}
_construct_name = String
@classmethod
def _construct_declarations(cls, args):
return Tuple(*[Declaration(arg) for arg in args])
class union(struct):
""" Represents a union in C """
__slots__ = ()