wet

wet: WEb Template

wet is a simple server-end WEB template engine based on ES6, with no 3rd-part dependency.

Features

t-for

Iterating array(for..of) and set(for..in): <t-for on="item of list" step="1">, item should be a valid identifier; step is a number to specify the step-length (takes effect on the array iterating only), default: 1

Also:

<t-for on="value, key in obj" />
<t-for on="item, index of arr" />
<t-for on="item, index of 1-10" />

When iterating an array：

1-10 means iterating from 1 to 10. 0-10 can be 10. Cannot put any whitespace besides -. FYI, integer supported only.

The boundary always included:

• 1-10: 1, 2, ..., 9, 10
• 0-10: 0, 1, ..., 9, 10
• 10: 0, 1, ..., 9, 10
• 9: 0, 1, ..., 9

t-if

Condition: <t-if on="condition">, condition can be an expression or variable

t-else

Condition: <t-else>

t-elif

Condition<t-elif on="condition">, condition can be an expression or variable

t-with

Make a scope <t-with varName="a.b.c">, varName equals the value of a.b.c, varName should be a valid identifier

t-tree

Render tree structure <t-tree on="tree as item">:

• tree is a field of context, should b e an Array (in order to support for multiple root nodes)
• item is the variable name in the scope

You should(must) use <t-children field="children" /> to specify where to render the children nodes.

t-html

Provide a method to render with the raw html: <t-html>{{'{{exp}}<p></p>{{exp}}'}}</t-html>.

t-include

Provide to import an external template file: <t-include file="./another.html" />

Attribute file specify where the template located, And should be a relative path (based on current template file path)

t-include can only contain t-fill as child

t-hole/t-fill

t-hole leave a hole in the template file, to fill it when another file includes it.

a.html

<div>
    <t-hole name="title">
      <div>default content</div>
    </t-hole>
    <t-hole></t-hole>
</div>

In the template file above, we got two holes. One with a name title:<t-hole name="title">，and another without a name: <t-hole>

No matter it has a name or not, hole name must be unique.

b.html

<t-include file="a.html">
  <t-fill>Fill anonymous hole</t-fill>
  <t-fill name="title">Fill named hole: title</t-fill>
</t-include>

No matter it has a name or not, fill name must be unique.

{{}}

Expression: {{var}}, {{obj.prop.value}}, {{a - b}}

The form {!{/}!} makes the raw {{/}} output: {{/}}.

Sample

demo.html

<div>
  <ul>
    <t-for on="item of list">
      <li>{{item}}</li>
    </t-for>
    <t-for on="item in set">
      <li>
        {{item.key}}: {{item.value}}
        <t-with xx="item.value.x.y">
          <span>{{xx.z}}</span>
        </t-with>
      </li>
    </t-for>
  </ul>
  <t-if on="visible">
    condition is true
  </t-if>
  <t-else>
    condition is false
  </t-else>
  <t-tree on="treeData as item">
    <div>
      {{item.data}}
      <div>
      	<t-children />    
      </div>
    </div>
  </t-tree>
  <t-include file="../common/footer.html" />
</div>

const context = {
  list: [1, 2, 3],
  set: {
    a: 1,
    b: {
      x: {
        y: {z: 5}
      }
    },
    c: 3
  },
  visible: false
}
wet.render('./demo.html', context, {cache: true})

context must be a Object, must not be an Array