47 lines
972 B
JavaScript
47 lines
972 B
JavaScript
'use strict';
|
|
|
|
var assert = require('assert');
|
|
var TokenStream = require('../');
|
|
|
|
assert.throws(function () {
|
|
new TokenStream('foo,bar');
|
|
});
|
|
var stream = new TokenStream([
|
|
'a',
|
|
'b',
|
|
'c',
|
|
'd'
|
|
]);
|
|
assert.throws(function () {
|
|
stream.lookahead(9);
|
|
});
|
|
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');
|
|
assert.throws(function () {
|
|
stream.peek();
|
|
});
|
|
assert.throws(function () {
|
|
stream.lookahead(0);
|
|
});
|
|
assert.throws(function () {
|
|
stream.lookahead(1);
|
|
});
|
|
assert.throws(function () {
|
|
stream.advance();
|
|
});
|