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