peg.js parser for kerbal config files

readme.md

This is a parser definition for peg.js, for parsing Kerbal Space Program config files.

Before use:

• strip everything after comments
• strip leading and trailing whitespace
• remove multiple newlines in a row ([\r\n]+) and replace with single new lines
• strip remove any leading blank line
• add trailing blank line

This creates key value array pairs, like:

[
  ["key", "value"],
  ["key2", "value"],
  ["LISTKEY", [
     ["key", "value"],
     ["key2", "value"]
  ]
]

Keys are always strings. Values are either strings or arrays.

parser.peg

start
  = nodes

nodes
  = node*

node
 = list
 / stringkeyvalue

list
  = whitespace key:keyword newline? whitespace "{" newline? nodes:nodes whitespace? "}" newline { return [key,nodes] }
 
stringkeyvalue
  = whitespace key:keyword whitespace "=" whitespace value:string newline { return [key,value]; }

keyword
  = str:[A-Za-z0-9_.]* { return str.join("")}

string
  = str:[^\r\n]* { return str.join("")}

whitespace
  = [ \t]*

newline
  = [\r\n]+