| expression's AST using this builder instance:: |
expression's AST using this builder instance:: |
| |
|
| >>> def pe(expr): |
>>> def pe(expr): |
| ... print parse_expr(expr, builder) |
... return parse_expr(expr, builder) |
| |
|
| |
|
| Names and Constants |
Names and Constants |
| NameError: fubar |
NameError: fubar |
| |
|
| |
|
| |
Namespaces and Binding |
| |
====================== |
| |
|
| |
An ``ExprBuilder`` object's ``bindings`` attribute is a list of dictionaries, |
| |
mapping names to the desired outputs:: |
| |
|
| |
>>> builder.bindings |
| |
[{}, {'a': Local('a'), 'c': Local('c'), 'b': Local('b'), 'e': Local('e'), |
| |
'd': Local('d'), 'g': Local('g'), 'f': Local('f')}, |
| |
{...}, {...}, {...}] |
| |
|
| |
You can add more bindings temporarily with the ``.push()`` method, then |
| |
remove them with ``.pop()``:: |
| |
|
| |
>>> builder.push({'q': pe('42')}) |
| |
|
| |
>>> builder.Name('q') |
| |
Const(42) |
| |
|
| |
>>> builder.pop() |
| |
{'q': Const(42)} |
| |
|
| |
>>> builder.Name('q') |
| |
Traceback (most recent call last): |
| |
... |
| |
NameError: q |
| |
|
| |
If you omit the argument to ``.push()``, it just adds an empty namespace to |
| |
the bindings:: |
| |
|
| |
>>> builder.push() |
| |
>>> builder.bindings |
| |
[{}, {}, {'a': Local('a'), 'c': Local('c'), 'b': Local('b'), |
| |
'e': Local('e'), 'd': Local('d'), 'g': Local('g'), |
| |
'f': Local('f')}, {...}, {...}, {...}] |
| |
|
| |
Which you can then modify using ``.bind()``:: |
| |
|
| |
>>> builder.bind({'x': pe('99')}) |
| |
>>> builder.bindings |
| |
[{'x': Const(99)}, {}, {'a': Local('a'), 'c': Local('c'), 'b': Local('b'), |
| |
'e': Local('e'), 'd': Local('d'), 'g': Local('g'), |
| |
'f': Local('f')}, {...}, {...}, {...}] |
| |
|
| |
And finally remove with ``.pop()``:: |
| |
|
| |
>>> builder.pop() |
| |
{'x': Const(99)} |
| |
|
| |
>>> builder.bindings |
| |
[{}, {'a': Local('a'), 'c': Local('c'), 'b': Local('b'), 'e': Local('e'), |
| |
'd': Local('d'), 'g': Local('g'), 'f': Local('f')}, |
| |
{...}, {...}, {...}] |
| |
|
| |
|
| Operators |
Operators |
| ========= |
========= |
| |
|
Diff of /PEAK-Rules/Code-Generation.txt
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