Pseudocode to Graphviz Converter

algorithm.pseudo

Place phone call.
Home?
	Leave message
	Wait for callback
	"Would you like to share a meal"
"Would you like to share a meal"
What is the response (A) ?
	"Do you enjoy a hot beverage"
	What is the response (B) ?
		n = 0
		"recreational activity? tell me one of your interests"
		Do I share that interest?
			n = n + 1
			n > 6?
				"recreational activity? tell me one of your interests"
			Choose least objectionable interest
			Partake in interest
		"Why don't we do that together"
		Partake in interest
		Begin friendship.
	Is it tea?
		Is it coffee?
			Is it cocoa?
				Have whatever that person said
				Begin friendship.
			Have cocoa
			Begin friendship.
		Have coffee
		Begin friendship.
	Have tea
	Begin friendship.
Dine together
Begin friendship.

parser.py

import sys
indent = 0
last = []
print "digraph G {"
for line in sys.stdin:
	count = 0
	while line.startswith("\t"):
		count += 1
		line = line[1:]
	if count > indent:
		indent += 1
		last.append(last[-1])
	elif count < indent:
		indent -= 1
		last = last[:-1]

	line = line.strip().replace('"', '\\"')
	if line.endswith("?"):
		print '"'+line+'"', "[shape=diamond]"
	elif line.endswith("."):
		print '"'+line+'"', "[shape=ellipse]"	
	else:
		print '"'+line+'"', "[shape=box]"

	if len(last) > 0:
		label = ""
		if last[-1].endswith("?"):
			if len(last) > 1 and  last[-1] == last[-2]:
				label = '[label="No"]'
			else:
				label = '[label="Yes"]'
		print '"'+last[-1]+'"', '->', '"'+line+'"', label
	
	last = last[:-1]
	last.append(line)
print "}"

schema.md

Everything's processed pretty much sequentially. If you treat every item as a list, it draws an arrow from one thing to another. Awesome.

But what if you want something cooler? Say, conditionals. Yeah. those are cool. So if you have that, you need my magical notation which involves lots of indentation.

Home?
	Oh noes, the condition's answer was No
	This has an arrow pointing from the thing above
Yaay, the answer was yes
Stuff that follows...

Ellipse'd elements end with periods.

Also, this is how you'd run it:

cat algorithm.pseudo | python parser.py | dot -Tsvg > blah.svg

Hi How to write a while loop ?

n < maxitems ?
Do Something
Exit

The graph draws an arrow for one of the conditions only, either True, but it fails to draw the false arrow

This code is amazing, Please Tell How to write "switch case" statement.

Hey, great code. Thanks for sharing. I converted this code into Javascript and based on WebGraphiViz. So it's now able to run independently on a web browser. Go ahead and try it.

https://github.com/leopck/codeflow
https://fridayswithfaraday.com/codeflow/

Your code falls under Sample 6.