EditorConfig Grammar

grammar.pegjs

Document = _ children:(Newline / Comment / Rule)* _ sections:Section* _ {
  return {
    type: 'EditorConfig',
    version: '15.0.0',
    children: children.concat(sections),
  }
}

_ 'whitespace' = [ \t\n\r]*

RuleEnd = _';'?_
Boolean = 'true' / 'false'

Newline = value:('\n' / '\r\n') {
  return {
    type: 'Newline',
    value,
  }
}

Comment = _ ('#' / ';') value:[^\r\n]* newline:Newline? {
  return {
    type: 'Comment',
    value: value.join('').trim(),
    newline,
  }
}

Rule =
  _ key:Identifier
  _ '='
  _ value:[^ \t\r\n]+
  RuleEnd {
  var value = value.join('')
  try {
    value = JSON.parse(value.toLowerCase())
  } catch (err) {
    // noop
  }
  return {
    type: 'Rule',
    key,
    value,
  }
}

Identifier = $([a-z_]i+)

Section = _ glob:SectionName _ children:(Comment / Rule)* _ {
  return {
    type: 'Section',
    glob: glob.join(''),
    children,
  }
}

SectionName = '[' patterns:[^\]]+ ']' {
  return patterns;
}