Modify a file structure using scripts

Question

I have a file say f1 in the following format:

digraph G {
  rankdir=TB;
  node [style="filled", ];
  2 [label="Decl n1", fillcolor="#FFEFD5", shape=box, ];
  3 [label="In1", fillcolor="#6495ED", shape=box, ];
  4 [label="Decl n2", fillcolor="#FFEFD5", shape=box, ];
  5 [label="In2", fillcolor="#6495ED", shape=box, ];
  ...........

  edge [dir=back, ];
  3 -> 2 [color="#000000", style="dotted", ];
  2 -> 3 [color="#000000", style="dotted", ];
  ...........
  }

I need to modify it such that each list is reversed and the "," at the end of the list should be removed. For example, the output format should be like:

2 [shape=box, fillcolor="#FFEFD5", label="Decl n1"];

How do I approach this problem? Do I have to use any scripts? I am not very familiar with shell scripts.

A library that understands the syntax is the safe place to start. See for instance https://pypi.python.org/pypi/graphviz (note, Python, not shell). — Charles Duffy, Jun 22 '17 at 14:18
@CharlesDuffy Will I be able to get the graph object from dot file? — Narmada, Jun 22 '17 at 14:31
Yes, as described in the answers to [How to parse a DOT file in Python](https://stackoverflow.com/questions/28313901/how-to-parse-a-dot-file-in-python) — Charles Duffy, Jun 22 '17 at 14:33

l0b0 · Answer 1 · 2017-06-22T14:43:21.380

0

Ideally you'd use something which is aware of the Dot syntax, allowing you to find and fix invalid syntax reliably. There is a Dot plugin for IDEA which you could try (use F2 to move to the next problem in the file). For very simple (but risky, since it's not syntax-aware) replacements you can use sed:

sed -i 's/, \]/]/' your-file

As for reversing with sed, the general pattern would be:

sed -i 's/\(first-part\)\(second-part\)/\2\1/' your-file

edited Jun 22 '17 at 14:43

answered Jun 22 '17 at 14:16

l0b0

55,365
30
138
223

This only removes the extra "," at the end. It doesn't reverse the list? – Narmada Jun 22 '17 at 14:24
Oh, I didn't see the reversal requirement. You can do that by using `sed` with backreferences (`\1` etc). – l0b0 Jun 22 '17 at 14:37
Can you elaborate on that? I'm not very familiar with sed – Narmada Jun 22 '17 at 14:40
This seems not to work. And what is first-part, second-part? – Narmada Jun 22 '17 at 15:36
The syntax given for `-i` makes this somewhat specific to GNU sed (one could work with BSD `sed`, as on MacOS, by passing an argument for backup filename extension). – Charles Duffy Jun 22 '17 at 17:52

Modify a file structure using scripts

1 Answers1