ComboCode.cc.ivs.sigproc.lmfit.asteval.Interpreter

Class Interpreter

mathematical expression compiler and interpreter. This module compiles expressions and statements to AST representation, using python's ast module, and then executes the AST representation using a dictionary of named object (variable, functions). This then gives a restricted version of Python, being a procedural language (though working on Python objects) with a simplified, flat namespace (this is overcome in related implementaions). The program syntax here is expected to be valid Python. The following Python syntax elements are not supported: Import, Exec, Lambda, Class, Global, Generators, Yield, Decorators, Finally for Try-Except Many parts of Python syntax are supported, including: advanced slicing: a[::-1], array[-3:, :, ::2] if-expressions: out = one_thing if TEST else other list comprehension for-loops, while-loops if-then-elif-else conditionals try-except (but not the 'finally' variant...) function definitions with def

Instance Methods

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__init__(self, symtable=None, writer=None, use_numpy=True)

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unimplemented(self, node)
unimplemented nodes

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raise_exception(self, node, exc=None, msg='', expr=None, lineno=None)
add an exception source code

parse(self, text)
parse statement/expression to Ast representation

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run(self, node, expr=None, lineno=None, with_raise=True)
executes parsed Ast representation for an expression

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__call__(self, expr, **kw)

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eval(self, expr, lineno=0, show_errors=True)
evaluates a single statement

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dump(self, node, **kw)
simple ast dumper

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on_expr(self, node)
expression

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on_index(self, node)
index

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on_return(self, node)
return statement: look for None, return special sentinal

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on_repr(self, node)
repr

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on_module(self, node)
module def

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on_pass(self, node)
pass statement

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on_ellipsis(self, node)
ellipses

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on_interrupt(self, node)
interrupt handler

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on_break(self, node)
break

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on_continue(self, node)
continue

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on_assert(self, node)
assert statement

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on_list(self, node)
list

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on_tuple(self, node)
tuple

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on_dict(self, node)
dictionary

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on_num(self, node)
return number

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on_str(self, node)
return string

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on_name(self, node)
Name node

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node_assign(self, node, val)
here we assign a value (not the node.value object) to a node this is used by on_assign, but also by for, list comprehension, etc.

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on_attribute(self, node)
extract attribute

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on_assign(self, node)
simple assignment

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on_augassign(self, node)
augmented assign

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on_slice(self, node)
simple slice

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on_extslice(self, node)
extended slice

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on_subscript(self, node)
subscript handling -- one of the tricky parts

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on_delete(self, node)
delete statement

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on_unaryop(self, node)
unary operator

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on_binop(self, node)
binary operator

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on_boolop(self, node)
boolean operator

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on_compare(self, node)
comparison operators

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on_print(self, node)
note: implements Python2 style print statement, not print() function.

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_printer(self, *out, **kws)
generic print function

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on_if(self, node)
regular if-then-else statement

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on_ifexp(self, node)
if expressions

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on_while(self, node)
while blocks

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on_for(self, node)
for blocks

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on_listcomp(self, node)
list comprehension

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on_excepthandler(self, node)
exception handler...

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on_tryexcept(self, node)
try/except blocks

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on_raise(self, node)
raise statement: note difference for python 2 and 3

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on_call(self, node)
function execution

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on_arg(self, node)
arg for function definitions

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on_functiondef(self, node)
define procedures

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Class Variables

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supported_nodes = ('arg', 'assert', 'assign', 'attribute', 'au...

on_print(self, node)

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note: implements Python2 style print statement, not print() function. May need improvement....

Class Variable Details

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supported_nodes

Value:

('arg',
 'assert',
 'assign',
 'attribute',
 'augassign',
 'binop',
 'boolop',
 'break',
...