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Simple Directed Acyclic Graph whith Cicle Detector and TopoloGical sorter utilities.

Project description

# Py_SDAG2 - Python Simple Directed Acyclic Graph

The Python Simple Directed Graph whith Cicle Detector and TopoloGical sorter utilities.

## Authors
- [Moises P. Sena](http://moisespsena.com)

## Install

```bash
sudo pip install py_sdag2
```

## Scripts

### tsort.py

Sources from Standard Input:

```bash
echo -e 'C A\nA B\nB D\nC D' | tsort.py
```

Sources from another file:

```bash
echo -e 'C A\nA B\nB D\nC D' > verticies.txt
```

```bash
tsort.py verticies.txt
```

More Options:

```bash
tsort.py --help
Usage: tsort.py [options] [FILE [OUT_FILE]]

Options:
-h, --help show this help message and exit
-f FILE, --file=FILE With no FILE, or when FILE is -, read standard input.
-o OUT_FILE, --out-file=OUT_FILE
Write result to OUT_FILE, default is standard output.
-s SEP, --separator=SEP
Items separator, default is \s regex.
-q QUIT_SEQ, --quit-sequence=QUIT_SEQ
Stop read FILE where line equals QUIT_SEQ, default is
:quit.
```

## Tests

```python
import unittest
from sdag2 import DAG, CycleDetectedException

class DAGTest(unittest.TestCase):
def test_simple(self):
'''
Tests the verticles order in:

C --> A --> B --> D
'''

dag = DAG()
a = dag.add("A")
b = dag.add("B")
c = dag.add("C")
d = dag.add("D")

dag.add_edge(c, a)
dag.add_edge(a, b)
dag.add_edge(b, d)
dag.add_edge(c, d)

rs = dag.topologicaly()

self.assertTrue(rs.index("C") < rs.index("A"))
self.assertTrue(rs.index("A") < rs.index("B"))
self.assertTrue(rs.index("B") < rs.index("D"))
self.assertTrue(rs.index("C") < rs.index("D"))

def test_cicle_detect(self):
'''
Tests the verticles order in:

C --> A --> B --> D -> C
'''

dag = DAG()
a = dag.add("A")
b = dag.add("B")
c = dag.add("C")
d = dag.add("D")

dag.add_edge(c, a)
dag.add_edge(a, b)
dag.add_edge(b, d)
dag.add_edge(c, d)

try:
# add cicle at A --> C --> A
dag.add_edge(a, c)
raise Exception("Cycle not detected")
except CycleDetectedException: pass

def main():
unittest.main()

if __name__ == "__main__":
main()
```

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