json_pegjs

js

doc = doc:(object / array / ws / n) { return doc }

// Doc
line = key:key ws? seperator ws? value:(prim / array / object) ws? lineEnd? n? ws? { return {key, value} }
key = txt:txt { return txt }

// Primitives
prim "primitive value" = val:(null / bool / num / txt) { return val }
null = "null" { return null }
bool "boolean" = bool:("true" / "false") { return Boolean(bool) }
num "number" = num:(minusPlus? [0-9]+ decimal? [0-9]*) { 
	const parsedNum = num.reduce((acc, curr) => {
		const str = Array.isArray(curr) ? curr.join("") : curr && curr.length ? curr : "";
    	return acc + str;
    }, "")
    return parseFloat(parsedNum);
 }
txt "text" = dobleQuote chars:char* dobleQuote { return chars.join("") }

// Compund type
array = arrayStart n? ws? objects:object+ n? ws? arrayEnd { return objects }
object = objectStart n? ws? lines:line+ objectEnd { return lines }

// Syntax
arrayStart = "["
arrayEnd = "]"
objectStart = "{"
objectEnd = "}"
lineEnd = ","
decimal = "."
dobleQuote = '"'
seperator = ":"

// Common
minusPlus = "-" / "+"
ws "whitespace" = [ \t\r]+
n "newline" = "\n"

// String
char
  = unescaped
  / escape
    sequence:(
        '"'
      / "\\"
      / "/"
      / "b" { return "\b"; }
      / "f" { return "\f"; }
      / "n" { return "\n"; }
      / "r" { return "\r"; }
      / "t" { return "\t"; }
      / "u" digits:$(HEXDIG HEXDIG HEXDIG HEXDIG) {
          return String.fromCharCode(parseInt(digits, 16));
        }
    )
    { return sequence; }

escape
  = "\\"

quotation_mark
  = '"'

unescaped
  = [^\0-\x1F\x22\x5C]

HEXDIG = [0-9a-f]i