GrauKatze 05f70669c9 Сконфигурирована и подготовлена база для проекта | 2 年之前 | |
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LICENSE | 2 年之前 | |
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index.js | 2 年之前 | |
package.json | 2 年之前 |
Take an array of token and produce a more useful API to give to a parser.
npm install token-stream
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.advance();
});
Gets and returns the next item in the stream without advancing the stream's position.
Returns the next item in the stream and advances the stream by one item.
Put a token on the start of the stream (useful if you need to back track after calling advance).
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()
.
MIT