root 3bf41bf355 update		1 年間前
..
test	3bf41bf355 update	1 年間前
.npmignore	3bf41bf355 update	1 年間前
.travis.yml	3bf41bf355 update	1 年間前
LICENSE	3bf41bf355 update	1 年間前
README.md	3bf41bf355 update	1 年間前
index.js	3bf41bf355 update	1 年間前
package.json	3bf41bf355 update	1 年間前

token-stream

Take an array of token and produce a more useful API to give to a parser.

Installation

npm install token-stream

Usage

var TokenStream = require('token-stream');

var stream = new TokenStream([
  'a',
  'b',
  'c',
  'd'
]);
assert(stream.peek() === 'a');
assert(stream.lookahead(0) == 'a');
assert(stream.lookahead(1) == 'b');

assert(stream.advance() === 'a');
assert(stream.peek() === 'b');
assert(stream.lookahead(0) == 'b');
assert(stream.lookahead(1) == 'c');

stream.defer('z');
assert(stream.peek() === 'z');
assert(stream.lookahead(0) == 'z');
assert(stream.lookahead(1) == 'b');
assert(stream.advance() === 'z');
assert(stream.advance() === 'b');
assert(stream.advance() === 'c');
assert(stream.advance() === 'd');

// an error is thrown if you try and advance beyond the end of the stream
assert.throws(function () {
  stream.adavance();
});

API

stream.peek()

Gets and returns the next item in the stream without advancing the stream's position.

stream.advance()

Returns the next item in the stream and advances the stream by one item.

stream.defer(token)

Put a token on the start of the stream (useful if you need to back track after calling advance.

stream.lookahead(index)

Return the item at index position from the start of the stream, but don't advance the stream. stream.lookahead(0) is equivalent to stream.peek().

License

MIT

README.md