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letter composite

Signature

function letter(): Parser<string>

letter parses a single alphabetical character. Returns the matched character. Unicode friendly.

const Parser = letter()

Success

run(Parser).with('X')

{
  isOk: true,
  span: [ 0, 1 ],
  pos: 1,
  value: 'X'
}

run(Parser).with('こ')

{
  isOk: true,
  span: [ 0, 1 ],
  pos: 1,
  value: 'こ'
}

Failure

run(Parser).with('42')

{
  isOk: false,
  span: [ 0, 0 ],
  pos: 0,
  expected: 'letter'
}