Tefcha

Text to Flowchart.

Demo

Rich Editor

https://hrhr49.github.io/tefcha/examples/rich-editor/dist

Simple Editor

https://hrhr49.github.io/tefcha/demo

Feature

Convert pseudo code to flowchart image.

Installation

CDN

<script src="https://unpkg.com/tefcha/umd/tefcha.js"></script>

npm

npm install tefcha

CLI Tool

You can use command line interface also. https://github.com/hrhr49/tefcha-cli

npm install tefcha-cli

Supported

Only these features are supported for now

if, elif, else statements
switch-case statement
while, do-while statements
break, continue statement
try-except statement

Not Supported (for now)

for statement
return statement

Reserved Word

if, elif, else, while, do, for, continue, break, switch, case, pass, try, except

Usage

Add <div class="tefca"> tag in HTML file.
Write psedo code in <div class="tefca"> tag.
Load umd/tefcha.js by script tag.
Call tefcha.initialize(), then, svg element will be generated.

Simple Example.

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
</head>

<body>
  <div class="tefcha">
# This is a example.
# NOTE:
#   The line starts with "#" is comment.
#   "\n" is newline.
#   All indent must be "  " (2 white spaces).

Start\nFizzBuzz!
i = 1

while i <= 100
  if i % 15 == 0
    print("FizzBuzz")
  elif i % 3 == 0
    print("Fizz")
  elif i % 5 == 0
    print("Buzz")
  else
    print(i)
  i = i + 1
End
  </div>
  <script src="https://unpkg.com/tefcha/umd/tefcha.js"></script>
  <script>
    tefcha.initialize();
  </script>
</body>

</html>

Simple Example Result

Configuration

You can pass a custom configuration to tefcha.initialize().

See

Configuration Example

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
</head>

<body>
  <div class="tefcha">
# This is a example.
# NOTE:
#   The line starts with "#" is comment.
#   "\n" is newline.
#   All indent must be "  " (2 white spaces).

Start\nFizzBuzz!
i = 1

while i <= 100
  if i % 15 == 0
    print("FizzBuzz")
  elif i % 3 == 0
    print("Fizz")
  elif i % 5 == 0
    print("Buzz")
  else
    print(i)
  i = i + 1
End
  </div>
  <script src="https://unpkg.com/tefcha/umd/tefcha.js"></script>
  <script>
    var blueConfig = {
      text: {
        attrs: {
          'font-size': '14px',
          'stroke': 'white',
          'fill': 'white',
          'fill-opacity': '100%',
          'stroke-width': '0px',
        },
      },
      label: {
        attrs: {
          'font-size': '10px',
          'stroke': 'royalblue',
          'fill': 'royalblue',
          'fill-opacity': '100%',
        },
      },
      path: {
        attrs: {
          'stroke': 'dimgray',
          'stroke-width': '2px',
          'fill-opacity': '0%',
        },
      },
      rect: {
        attrs: {
          'stroke': 'steelblue',
          'stroke-width': '2px',
          'fill': 'steelblue',
          'fill-opacity': '100%',
          'rx': '3px',
          'ry': '3px',
        },
      },
      diamond: {
        attrs: {
          'stroke': 'royalblue',
          'stroke-width': '2px',
          'fill': 'royalblue',
          'fill-opacity': '100%',
        },
      },
      arrowHead: {
        attrs: {
          'stroke': 'dimgray',
          'stroke-width': '2px',
          'fill': 'dimgray',
          'fill-opacity': '100%',
        },
      },
    };
    tefcha.initialize(blueConfig);
  </script>
</body>

</html>

Configuration Example Result

Syntax

Statement

If text is not started with reserved word, it means simple statement. It is rendered as a box with the text.

hello

Newline

You can use \n for newline.

hello\nworld

If Statement

text starts with if means if statement.
indented line means block.

if score > 80
  good!

end

If-elif Statement

You can use elif and else also.

if score > 80
  good!
elif score > 30
  soso
else
  bad!

end

Switch-Case Statement

You can use switch-case statement by switch block and case block.

NOTE: Unlike switch-case in C language, you cannot use "break" at the end of case block.

switch fruit
  case apple
    red
  case banana
    yellow
  case grape
    purple
end

While Statement

text starts with while means while statement.

while score < 30
  study again

end

Do While Statement

text starts with do means do-while statement.
after do block, line starts with while is needed.

do
  get input from user
while input is invalid

end

Break

You can break loop by break keyword.

i = 0

while i < n
  if fruits[i] == 'apple'
    break
  i = i + 1
end

Continue

You can use continue keyword also.

i = 0

while i < n
  if user[i] is null
    continue
  register user[i]
  i = i + 1

end

Try-Except

You can use try, except keyword also. It's syntax is similar to Python (a kind of programming language).

try
  calculate()
except ValueError
  invalid value
except ZeroDivisionError
  value must be != 0
end

Author

hrhr49

hiro49410@gmail.com

License

MIT

hrhr49/tefcha