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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Text Templates</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'string-formatting';
}
if (e.key == "ArrowRight") {
window.location.href = 'regular-expressions';
}
}
</script>
<body>
<div class="example" id="text-templates">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Text Templates</h2>
<table>
<tr>
<td class="docs">
<p>Go က <code>text/template</code> package နဲ့ dynamic content ဖန်တီးဖို့ သို့မဟုတ်
user ကို customized output ပြဖို့ built-in support ပေးထားပါတယ်။
<code>html/template</code> ဆိုတဲ့ ဆင်တူ package တစ်ခုကလည်း တူညီတဲ့ API ပေးပြီး
လုံခြုံရေးဆိုင်ရာ feature တွေ ထပ်ပါပါတယ်။ HTML generate လုပ်ဖို့အတွက် အဲဒါကို သုံးသင့်ပါတယ်။</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/d5nHzeP0Gie"><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">"os"</span>
<span class="s">"text/template"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Template အသစ်တစ်ခု ဖန်တီးပြီး သူ့ရဲ့ body ကို string တစ်ခုကနေ parse လုပ်နိုင်ပါတယ်။
Template တွေဟာ static text နဲ့ <code>{{...}}</code> ထဲမှာ ပါတဲ့ “action” တွေရဲ့ ပေါင်းစပ်မှုဖြစ်ပါတယ်။
Action တွေက content ကို dynamic ထည့်သွင်းဖို့ သုံးပါတယ်။</p>
</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">
</td>
<td class="code leading">
<pre class="chroma"> <span class="nx">t1</span> <span class="o">:=</span> <span class="nx">template</span><span class="p">.</span><span class="nf">New</span><span class="p">(</span><span class="s">"t1"</span><span class="p">)</span>
<span class="nx">t1</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">t1</span><span class="p">.</span><span class="nf">Parse</span><span class="p">(</span><span class="s">"Value is {{.}}\n"</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>နောက်တစ်နည်းအနေနဲ့ <code>template.Must</code> function ကို သုံးပြီး
<code>Parse</code> က error ပြန်ပေးရင် panic ဖြစ်အောင် လုပ်နိုင်ပါတယ်။
ဒါက global scope မှာ initialize လုပ်တဲ့ template တွေအတွက် အထူးအသုံးဝင်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t1</span> <span class="p">=</span> <span class="nx">template</span><span class="p">.</span><span class="nf">Must</span><span class="p">(</span><span class="nx">t1</span><span class="p">.</span><span class="nf">Parse</span><span class="p">(</span><span class="s">"Value: {{.}}\n"</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Template ကို “execute” လုပ်ခြင်းအားဖြင့် သူ့ရဲ့ action တွေအတွက်
သတ်မှတ်ထားတဲ့ တန်ဖိုးတွေနဲ့အတူ စာသားကို ထုတ်လုပ်ပါတယ်။
<code>{{.}}</code> action က <code>Execute</code> ကို parameter အဖြစ်ပေးလိုက်တဲ့ တန်ဖိုးနဲ့ အစားထိုးခံရပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t1</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="s">"some text"</span><span class="p">)</span>
<span class="nx">t1</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span>
<span class="nx">t1</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="s">"Go"</span><span class="p">,</span>
<span class="s">"Rust"</span><span class="p">,</span>
<span class="s">"C++"</span><span class="p">,</span>
<span class="s">"C#"</span><span class="p">,</span>
<span class="p">})</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>အောက်မှာ သုံးမယ့် helper function တစ်ခုပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">Create</span> <span class="o">:=</span> <span class="kd">func</span><span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">t</span> <span class="kt">string</span><span class="p">)</span> <span class="o">*</span><span class="nx">template</span><span class="p">.</span><span class="nx">Template</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">template</span><span class="p">.</span><span class="nf">Must</span><span class="p">(</span><span class="nx">template</span><span class="p">.</span><span class="nf">New</span><span class="p">(</span><span class="nx">name</span><span class="p">).</span><span class="nf">Parse</span><span class="p">(</span><span class="nx">t</span><span class="p">))</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Data က struct ဖြစ်နေရင် <code>{{.FieldName}}</code> action ကို သုံးပြီး
သူ့ရဲ့ field တွေကို access လုပ်နိုင်ပါတယ်။ Template execute လုပ်နေချိန်မှာ
access လုပ်နိုင်ဖို့ field တွေကို export လုပ်ထားသင့်ပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t2</span> <span class="o">:=</span> <span class="nf">Create</span><span class="p">(</span><span class="s">"t2"</span><span class="p">,</span> <span class="s">"Name: {{.Name}}\n"</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"> <span class="nx">t2</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="kd">struct</span> <span class="p">{</span>
<span class="nx">Name</span> <span class="kt">string</span>
<span class="p">}{</span><span class="s">"Jane Doe"</span><span class="p">})</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Map တွေအတွက်လည်း အတူတူပါပဲ။ Map တွေမှာတော့ key နာမည်တွေရဲ့
အကြီးအသေးပေါ် ကန့်သတ်ချက် မရှိပါဘူး။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t2</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="kd">map</span><span class="p">[</span><span class="kt">string</span><span class="p">]</span><span class="kt">string</span><span class="p">{</span>
<span class="s">"Name"</span><span class="p">:</span> <span class="s">"Mickey Mouse"</span><span class="p">,</span>
<span class="p">})</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>if/else က template တွေမှာ conditional execution ပေးပါတယ်။
Type တစ်ခုရဲ့ default value ဖြစ်တဲ့ 0၊ string အလွတ်၊
nil pointer စတာတွေကို false လို့ သတ်မှတ်ပါတယ်။
ဒီဥပမာက template ရဲ့ နောက်ထပ် feature တစ်ခုကိုလည်း ပြသထားပါတယ်:
whitespace ဖြတ်ဖို့ action တွေထဲမှာ <code>-</code> သုံးတာပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">t3</span> <span class="o">:=</span> <span class="nf">Create</span><span class="p">(</span><span class="s">"t3"</span><span class="p">,</span>
<span class="s">"{{if . -}} yes {{else -}} no {{end}}\n"</span><span class="p">)</span>
<span class="nx">t3</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="s">"not empty"</span><span class="p">)</span>
<span class="nx">t3</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span> <span class="s">""</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>range block တွေက slice၊ array၊ map သို့မဟုတ် channel တွေကို
loop လုပ်ခွင့်ပေးပါတယ်။ Range block ထဲမှာ <code>{{.}}</code> က
လက်ရှိ iteration ရဲ့ item ကို ညွှန်းပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">t4</span> <span class="o">:=</span> <span class="nf">Create</span><span class="p">(</span><span class="s">"t4"</span><span class="p">,</span>
<span class="s">"Range: {{range .}}{{.}} {{end}}\n"</span><span class="p">)</span>
<span class="nx">t4</span><span class="p">.</span><span class="nf">Execute</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stdout</span><span class="p">,</span>
<span class="p">[]</span><span class="kt">string</span><span class="p">{</span>
<span class="s">"Go"</span><span class="p">,</span>
<span class="s">"Rust"</span><span class="p">,</span>
<span class="s">"C++"</span><span class="p">,</span>
<span class="s">"C#"</span><span class="p">,</span>
<span class="p">})</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code">
<pre class="chroma"><span class="gp">$</span> go run templates.go
<span class="go">Value: some text
</span><span class="go">Value: 5
</span><span class="go">Value: [Go Rust C++ C#]
</span><span class="go">Name: Jane Doe
</span><span class="go">Name: Mickey Mouse
</span><span class="go">yes
</span><span class="go">no
</span><span class="go">Range: Go Rust C++ C# </span></pre>
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="regular-expressions">Regular Expressions</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>
<script>
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