from simpleparse.parser import Parser
from pprint import pprint

declaration = """
file           := header, content
header         := shebang, version
shebang        := '#!', ts, word, ('-',[a-zA-Z0-9]+)?,'\n'
version        := 'version', ts, [0-9], '.', [0-9], ts, 'v', [0-9], '\n'
content        := node*
node           := word, ts, '{\n', nodecontent*, '}\n'
nodecontent    := ts, knobname, ts, knobvalue, '\n'
knobname       := word
knobvalue      := word / string / multiknobgroup / knobgroup
knobgroup      := '{', (word / string, ts)*, '}'
multiknobgroup := '{\n', (ts, knobgroup, '\n')*, ts, '}\n'
string         := '"', word*, '"'
word           := ([a-zA-Z0-9-_()/\~.<>?;:])+,ts
ts             := [ \t]*
"""

script = """#! /opt/foundry/Nuke/6.3v7-x64/Nuke6.3 -nx
version 6.3 v7
Root {
 inputs 0
 name /path/to/file_name.nk
 first_frame 0
 last_frame 100
 lock_range true
 format "2048 1556 0 0 2048 1556 1 2K_Super_35(full-ap)"
 proxy_type scale
 proxy_format "1024 778 0 0 1024 778 1 1K_Super_35(full-ap)"
 addUserKnob {20 custom l Custom}
 addUserKnob {1 scene l Scene}
 views {
  {left ""}
  {right ""}
 }
}
"""

parser = Parser(declaration, "file")

success, resultTree, nextCharacter = parser.parse(script)
pprint(resultTree)