Pynescript

Features

Parse Pinescript code into AST
Dump parsed AST
Unparse parsed AST back to Pinescript code

Given an example pinescript with name of rsi_strategy.pine:

//@version=5
strategy("RSI Strategy", overlay=true)
length = input( 14 )
overSold = input( 30 )
overBought = input( 70 )
price = close
vrsi = ta.rsi(price, length)
co = ta.crossover(vrsi, overSold)
cu = ta.crossunder(vrsi, overBought)
if (not na(vrsi))
	if (co)
		strategy.entry("RsiLE", strategy.long, comment="RsiLE")
	if (cu)
		strategy.entry("RsiSE", strategy.short, comment="RsiSE")
//plot(strategy.equity, title="equity", color=color.red, linewidth=2, style=plot.style_areabr)

Parsing script into AST and dumping it:

$ pynescript parse-and-dump rsi_strategy.pine

Gives like:

Script(
  body=[
    Expr(
      value=Call(
        func=Name(id='strategy', ctx=Load()),
        args=[
          Arg(
            value=Constant(value='RSI Strategy')),
          Arg(
            value=Constant(value=True),
            name='overlay')])),
    Assign(
      target=Name(id='length', ctx=Store()),
      value=Call(
        func=Name(id='input', ctx=Load()),
        args=[
          Arg(
            value=Constant(value=14))]),
      annotations=[]),
    ...

Full AST dump that is quite long...

Script(
  body=[
    Expr(
      value=Call(
        func=Name(id='strategy', ctx=Load()),
        args=[
          Arg(
            value=Constant(value='RSI Strategy')),
          Arg(
            value=Constant(value=True),
            name='overlay')])),
    Assign(
      target=Name(id='length', ctx=Store()),
      value=Call(
        func=Name(id='input', ctx=Load()),
        args=[
          Arg(
            value=Constant(value=14))]),
      annotations=[]),
    Assign(
      target=Name(id='overSold', ctx=Store()),
      value=Call(
        func=Name(id='input', ctx=Load()),
        args=[
          Arg(
            value=Constant(value=30))]),
      annotations=[]),
    Assign(
      target=Name(id='overBought', ctx=Store()),
      value=Call(
        func=Name(id='input', ctx=Load()),
        args=[
          Arg(
            value=Constant(value=70))]),
      annotations=[]),
    Assign(
      target=Name(id='price', ctx=Store()),
      value=Name(id='close', ctx=Load()),
      annotations=[]),
    Assign(
      target=Name(id='vrsi', ctx=Store()),
      value=Call(
        func=Attribute(
          value=Name(id='ta', ctx=Load()),
          attr='rsi',
          ctx=Load()),
        args=[
          Arg(
            value=Name(id='price', ctx=Load())),
          Arg(
            value=Name(id='length', ctx=Load()))]),
      annotations=[]),
    Assign(
      target=Name(id='co', ctx=Store()),
      value=Call(
        func=Attribute(
          value=Name(id='ta', ctx=Load()),
          attr='crossover',
          ctx=Load()),
        args=[
          Arg(
            value=Name(id='vrsi', ctx=Load())),
          Arg(
            value=Name(id='overSold', ctx=Load()))]),
      annotations=[]),
    Assign(
      target=Name(id='cu', ctx=Store()),
      value=Call(
        func=Attribute(
          value=Name(id='ta', ctx=Load()),
          attr='crossunder',
          ctx=Load()),
        args=[
          Arg(
            value=Name(id='vrsi', ctx=Load())),
          Arg(
            value=Name(id='overBought', ctx=Load()))]),
      annotations=[]),
    Expr(
      value=If(
        test=UnaryOp(
          op=Not(),
          operand=Call(
            func=Name(id='na', ctx=Load()),
            args=[
              Arg(
                value=Name(id='vrsi', ctx=Load()))])),
        body=[
          Expr(
            value=If(
              test=Name(id='co', ctx=Load()),
              body=[
                Expr(
                  value=Call(
                    func=Attribute(
                      value=Name(id='strategy', ctx=Load()),
                      attr='entry',
                      ctx=Load()),
                    args=[
                      Arg(
                        value=Constant(value='RsiLE')),
                      Arg(
                        value=Attribute(
                          value=Name(id='strategy', ctx=Load()),
                          attr='long',
                          ctx=Load())),
                      Arg(
                        value=Constant(value='RsiLE'),
                        name='comment')]))],
              orelse=[])),
          Expr(
            value=If(
              test=Name(id='cu', ctx=Load()),
              body=[
                Expr(
                  value=Call(
                    func=Attribute(
                      value=Name(id='strategy', ctx=Load()),
                      attr='entry',
                      ctx=Load()),
                    args=[
                      Arg(
                        value=Constant(value='RsiSE')),
                      Arg(
                        value=Attribute(
                          value=Name(id='strategy', ctx=Load()),
                          attr='short',
                          ctx=Load())),
                      Arg(
                        value=Constant(value='RsiSE'),
                        name='comment')]))],
              orelse=[]))],
        orelse=[]))],
  annotations=[
    '//@version=5'])

Parsing into AST and unparsing it back:

$ pynescript parse-and-unparse rsi_strategy.pine

Gives (with some difference in syntax including spacing):

//@version=5
strategy("RSI Strategy", overlay=true)
length = input(14)
overSold = input(30)
overBought = input(70)
price = close
vrsi = ta.rsi(price, length)
co = ta.crossover(vrsi, overSold)
cu = ta.crossunder(vrsi, overBought)
if not na(vrsi)
    if co
        strategy.entry("RsiLE", strategy.long, comment="RsiLE")
    if cu
        strategy.entry("RsiSE", strategy.short, comment="RsiSE")

Requirements

Python 3.10 or higher

Installation

You can install Pynescript via pip from PyPI:

$ pip install pynescript

Usage

Please see the Usage for details.

License

Distributed under the terms of the LGPL 3.0 license, Pynescript is free and open source software.

Issues

If you encounter any problems, please file an issue along with a detailed description.

elbakramer / pynescript