More fun with PyParsing - almost did it on my own..

[Paul McGuire]

On May 14, 6:07 pm, rh0dium <steven.kl... at gmail.com> wrote:
> Hi all,
>
> I almost did my first pyparsing without help but here we go again.
> Let's start with my code.  The sample data is listed below.
>
> <snip...>
>
> x =  cells.parseString(data)
> print x[0].asDict()
>
> reveals
> {'pins': ([(['A', 'Input'], {'direction': [('Input', 1)], 'name':
> [('A', 0)]}), (['B', 'Input'], {'direction': [('Input', 1)], 'name':
> [('B', 0)]}), (['Y', 'Output'], {'direction': [('Output', 1)], 'name':
> [('Y', 0)]}), (['VDD', 'Inout', 'Power'], {'direction': [('Inout',
> 1)], 'name': [('VDD', 0)], 'signal': [('Power', 2)]}), (['VSS',
> 'Inout', 'Ground'], {'direction': [('Inout', 1)], 'name': [('VSS',
> 0)], 'signal': [('Ground', 2)]})], {}), 'name': 'AND2X1', 'library':
> 'stdcell130'}
>
> As you can see the Pins is all jacked up and I want is not that.  I
> want the following
>
> { 'name': 'AND2X1',
>   'library':'stdcell130'
>   'pins': [ { 'name': 'VSS', 'direction':'Inout', 'signal':'Ground'},
>              { 'name': 'VDD', 'direction':'Inout', 'signal':'Power'},
>              { 'name': 'A', 'direction':'Input' },
>              { 'name': 'B', 'direction':'Input' },
>              { 'name': 'Y', 'direction':'Output' } ]
>
> }
>
> What did I do wrong in my code..
>

Not a thing!  asDict() is just not very good at dumping out lists of
subdicts.  Look at the output when you iterate over the cells in x,
and the pins in each cell:

for cell in x:
    print "Name:", cell["name"]
    print "Library:", cell["library"]
    print "Pins:"
    for pin in cell["pins"]:
        print pin.asDict()
    print

Prints:

Name: AND2X1
Library: stdcell130
Pins:
{'direction': 'Input', 'name': 'A'}
{'direction': 'Input', 'name': 'B'}
{'direction': 'Output', 'name': 'Y'}
{'direction': 'Inout', 'name': 'VDD', 'signal': 'Power'}
{'direction': 'Inout', 'name': 'VSS', 'signal': 'Ground'}

Name: AND2X2
Library: stdcell130
Pins:
{'direction': 'Input', 'name': 'A'}
{'direction': 'Input', 'name': 'B'}
{'direction': 'Output', 'name': 'Y'}
{'direction': 'Inout', 'name': 'VDD', 'signal': 'Power'}
{'direction': 'Inout', 'name': 'VSS', 'signal': 'Ground'}


Now, here is a real trick.  Each pin has a unique name, and the
collection of pins can be used to define a dict using the pin names as
dynamically-defined keys.  You've laid all the ground work, all that
is needed is to define your sequence of OneOrMore(guts) as a dict
using the guts names as keys.  The only change needed is to wrap this
OneOrMore(guts) in a pyparsing Dict class - that is, change:

OneOrMore(guts).setResultsName("pins")

to:

Dict(OneOrMore(guts)).setResultsName("pins")

Now, if you iterate over each cell, you can dump out its structure:

for cell in x:
    print cell.dump()
    print

Prints:

['stdcell130', 'AND2X1', [['A', 'Input'], ['B', 'Input'], ['Y',
'Output'], ['VDD', 'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]]
- library: stdcell130
- name: AND2X1
- pins: [['A', 'Input'], ['B', 'Input'], ['Y', 'Output'], ['VDD',
'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]
  - A: Input
  - B: Input
  - VDD: ['Inout', 'Power']
    - direction: Inout
    - name: VDD
    - signal: Power
  - VSS: ['Inout', 'Ground']
    - direction: Inout
    - name: VSS
    - signal: Ground
  - Y: Output

['stdcell130', 'AND2X2', [['A', 'Input'], ['B', 'Input'], ['Y',
'Output'], ['VDD', 'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]]
- library: stdcell130
- name: AND2X2
- pins: [['A', 'Input'], ['B', 'Input'], ['Y', 'Output'], ['VDD',
'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]
  - A: Input
  - B: Input
  - VDD: ['Inout', 'Power']
    - direction: Inout
    - name: VDD
    - signal: Power
  - VSS: ['Inout', 'Ground']
    - direction: Inout
    - name: VSS
    - signal: Ground
  - Y: Output

To flesh out all fields of all pins, I suggest you add a default value
for the optional signal entry, and set the results name on the
Optional wrapper, not the quoted string.  Change:

    +
Optional(quotedString.setParseAction(removeQuotes).setResultsName("signal"))

to:

    +
Optional(quotedString.setParseAction(removeQuotes),default="").setResultsName("signal")

Now dump() called on each cell prints out:

['stdcell130', 'AND2X1', [['A', 'Input', ''], ['B', 'Input', ''],
['Y', 'Output', ''], ['VDD', 'Inout', 'Power'], ['VSS', 'Inout',
'Ground']]]
- library: stdcell130
- name: AND2X1
- pins: [['A', 'Input', ''], ['B', 'Input', ''], ['Y', 'Output', ''],
['VDD', 'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]
  - A: ['Input', '']
    - direction: Input
    - name: A
    - signal:
  - B: ['Input', '']
    - direction: Input
    - name: B
    - signal:
  - VDD: ['Inout', 'Power']
    - direction: Inout
    - name: VDD
    - signal: Power
  - VSS: ['Inout', 'Ground']
    - direction: Inout
    - name: VSS
    - signal: Ground
  - Y: ['Output', '']
    - direction: Output
    - name: Y
    - signal:

Power
Input
['stdcell130', 'AND2X2', [['A', 'Input', ''], ['B', 'Input', ''],
['Y', 'Output', ''], ['VDD', 'Inout', 'Power'], ['VSS', 'Inout',
'Ground']]]
- library: stdcell130
- name: AND2X2
- pins: [['A', 'Input', ''], ['B', 'Input', ''], ['Y', 'Output', ''],
['VDD', 'Inout', 'Power'], ['VSS', 'Inout', 'Ground']]
  - A: ['Input', '']
    - direction: Input
    - name: A
    - signal:
  - B: ['Input', '']
    - direction: Input
    - name: B
    - signal:
  - VDD: ['Inout', 'Power']
    - direction: Inout
    - name: VDD
    - signal: Power
  - VSS: ['Inout', 'Ground']
    - direction: Inout
    - name: VSS
    - signal: Ground
  - Y: ['Output', '']
    - direction: Output
    - name: Y
    - signal:

You can use the nested names shown in the dump to access individual
bits of the parsed results:

for cell in x:
    print cell.name
    print cell.pins.keys()
    print cell.pins.VDD.signal
    print cell.pins.A.direction
    print

prints:

AND2X1
['A', 'Y', 'B', 'VDD', 'VSS']
Power
Input

AND2X2
['A', 'Y', 'B', 'VDD', 'VSS']
Power
Input

-- Paul