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url-parsing
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: URL Parsing</title>
<link rel=stylesheet href="site.css">
</head>
<script>
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if (e.key == "ArrowLeft") {
window.location.href = 'number-parsing';
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<body>
<div class="example" id="url-parsing">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: URL Parsing</h2>
<table>
<tr>
<td class="docs">
<p>URL တွေက <a href="https://adam.herokuapp.com/past/2010/3/30/urls_are_the_uniform_way_to_locate_resources/">resource တွေကို တည်နေရာသတ်မှတ်ဖို့ ပုံစံတူနည်းလမ်း</a> တစ်ခုပေးပါတယ်။
Go မှာ URL တွေကို ဘယ်လို parse လုပ်မလဲဆိုတာ ဒီမှာရှင်းပြပါမယ်။</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://go.dev/play/p/hQyRRF4f8YA"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"net"</span>
<span class="s">"net/url"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ကျွန်တော်တို့က ဒီဥပမာ URL ကို parse လုပ်ပါမယ်။ ဒီထဲမှာ
scheme၊ authentication info၊ host၊ port၊ path၊
query params နဲ့ query fragment တွေ ပါဝင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">s</span> <span class="o">:=</span> <span class="s">"postgres://user:pass@host.com:5432/path?k=v#f"</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>URL ကို parse လုပ်ပြီး error မရှိကြောင်း သေချာအောင်လုပ်ပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">u</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">url</span><span class="p">.</span><span class="nf">Parse</span><span class="p">(</span><span class="nx">s</span><span class="p">)</span>
<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
<span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Scheme ကို access လုပ်တာ ရိုးရှင်းပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">Scheme</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>User</code> က authentication info အားလုံးပါဝင်ပါတယ်။ တစ်ခုချင်းစီရဲ့
တန်ဖိုးတွေအတွက် <code>Username</code> နဲ့ <code>Password</code> ကို ခေါ်သုံးပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">User</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">User</span><span class="p">.</span><span class="nf">Username</span><span class="p">())</span>
<span class="nx">p</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">u</span><span class="p">.</span><span class="nx">User</span><span class="p">.</span><span class="nf">Password</span><span class="p">()</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">p</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Host</code> မှာ hostname နဲ့ port နှစ်ခုလုံး ပါဝင်ပါတယ် (port ရှိရင်)။
သူတို့ကို ခွဲထုတ်ဖို့ <code>SplitHostPort</code> ကို သုံးပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">Host</span><span class="p">)</span>
<span class="nx">host</span><span class="p">,</span> <span class="nx">port</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">net</span><span class="p">.</span><span class="nf">SplitHostPort</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">Host</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">host</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">port</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီမှာတော့ <code>path</code> နဲ့ <code>#</code> နောက်က fragment ကို ထုတ်ယူပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">Path</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">Fragment</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Query params တွေကို <code>k=v</code> ပုံစံ string အနေနဲ့ ရယူဖို့ <code>RawQuery</code> ကို သုံးပါ။
Query params တွေကို map အဖြစ်လည်း parse လုပ်နိုင်ပါတယ်။ Parse လုပ်ထားတဲ့
query param map တွေက string ကနေ string တွေရဲ့ slice ဆီကို ဖြစ်ပါတယ်။
ဒါကြောင့် ပထမဆုံးတန်ဖိုးကိုပဲ လိုချင်ရင် <code>[0]</code> ကို index လုပ်ပါ။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">RawQuery</span><span class="p">)</span>
<span class="nx">m</span><span class="p">,</span> <span class="nx">_</span> <span class="o">:=</span> <span class="nx">url</span><span class="p">.</span><span class="nf">ParseQuery</span><span class="p">(</span><span class="nx">u</span><span class="p">.</span><span class="nx">RawQuery</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">m</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">m</span><span class="p">[</span><span class="s">"k"</span><span class="p">][</span><span class="mi">0</span><span class="p">])</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
<p>ကျွန်တော်တို့ရဲ့ URL parsing ပရိုဂရမ်ကို run လိုက်တာက
ကျွန်တော်တို့ ထုတ်ယူထားတဲ့ မတူညီတဲ့
အစိတ်အပိုင်းအားလုံးကို ပြသပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="gp">$</span> go run url-parsing.go
<span class="go">postgres
</span><span class="go">user:pass
</span><span class="go">user
</span><span class="go">pass
</span><span class="go">host.com:5432
</span><span class="go">host.com
</span><span class="go">5432
</span><span class="go">/path
</span><span class="go">f
</span><span class="go">k=v
</span><span class="go">map[k:[v]]
</span><span class="go">v</span></pre>
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="sha256-hashes">SHA256 Hashes</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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