Liberty Parser
This library provides functions to parse, manipulate and format 'Liberty' files. The liberty format is a common standard to describe certain aspects of standard-cell libraries such as timing, power, cell pin types, etc.
Example
from liberty.parser import parse_liberty
# Read and parse a library.
library = parse_liberty(open(liberty_file).read())
# Format the library.
print(str(library))
# Loop through all cells.
for cell_group in library.get_groups('cell'):
cell_name = cell_group.args[0]
print(cell_name)
# Loop through all pins of the cell.
for pin_group in cell_group.get_groups('pin'):
pin_name = pin_group.args[0]
print(pin_name)
# Access a pin attribute.
some_attribute = pin_group['some_attribute']
Library structure.
The liberty library is made of Group objects.
The library itself is a Group object. A Group contains
other nested Groups, has a name, a list of arguments and
attributes.
group_name(args) {
simple_attribute: 1.23;
other_group_name(args) {
other_simple_attribute: 2.34;
complex_attribute (1.23, 2.34);
}
}
Reading arrays and timing tables.
Timing tables are stored in the liberty format as attributes which holds a string with comma-separated values.
This string can be converted into a Numpy array with get_array:
some_group.get_array('attribute_name')
More examples
Example scripts can be found under ./examples.
Install for development
Run the following command to install the liberty parser using symlinks. This allows to edit the parser with immediate effect on the installed package.
pip install --upgrade --editable .
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Release files for liberty-parser 0.0.29
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