练习49: 创造句子–笨方法学ruby在线-昊天SEO

从我们这个小游戏的词汇扫描器中，我们应该可以得到类似下面的列表（你的看起来可能格式会不太一样）：

<span class='wp_keywordlink'><a href="http://www.168seo.cn/ruby" title="ruby">ruby</a></span>-1.9.2-p180 :003 > print Lexicon.scan<span class="o">(</span><span class="s2">"go north"</span><span class="o">)</span>
<span class="o">[</span><span class="c">#<struct Lexicon::Pair token=:verb, word="go">,</span>
    <span class="c">#<struct Lexicon::Pair token=:direction, word="north">] => nil </span>
<span class='wp_keywordlink'><a href="http://www.168seo.cn/ruby" title="ruby">ruby</a></span>-1.9.2-p180 :004 > print Lexicon.scan<span class="o">(</span><span class="s2">"kill the princess"</span><span class="o">)</span>
<span class="o">[</span><span class="c">#<struct Lexicon::Pair token=:verb, word="kill">,</span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="the">,</span>
    <span class="c">#<struct Lexicon::Pair token=:noun, word="princess">] => nil</span>
<span class='wp_keywordlink'><a href="http://www.168seo.cn/ruby" title="ruby">ruby</a></span>-1.9.2-p180 :005 > print Lexicon.scan<span class="o">(</span><span class="s2">"eat the bear"</span><span class="o">)</span>
<span class="o">[</span><span class="c">#<struct Lexicon::Pair token=:verb, word="eat">,</span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="the">,</span>
    <span class="c">#<struct Lexicon::Pair token=:noun, word="bear">] => nil </span>
<span class='wp_keywordlink_affiliate'><a href="https://www.168seo.cn/tag/ruby" title="View all posts in ruby" target="_blank">ruby</a></span>-1.9.2-p180 :006 > print Lexicon.scan<span class="o">(</span><span class="s2">"open the door and smack the bear in the nose"</span><span class="o">)</span>
<span class="o">[</span><span class="c">#<struct Lexicon::Pair token=:error, word="open">,</span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="the">, </span>
    <span class="c">#<struct Lexicon::Pair token=:noun, word="door">, </span>
    <span class="c">#<struct Lexicon::Pair token=:error, word="and">, </span>
    <span class="c">#<struct Lexicon::Pair token=:error, word="smack">, </span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="the">, </span>
    <span class="c">#<struct Lexicon::Pair token=:noun, word="bear">, </span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="in">, </span>
    <span class="c">#<struct Lexicon::Pair token=:stop, word="the">, </span>
    <span class="c">#<struct Lexicon::Pair token=:error, word="nose">] => nil </span>
<span class='wp_keywordlink_affiliate'><a href="https://www.168seo.cn/tag/ruby" title="View all posts in ruby" target="_blank">ruby</a></span>-1.9.2-p180 :007 >