# String Interpolation

Each text element and attribute value can use string interpolation.

Example:

```xml
<h1 title="${props.title}">Welcome ${props.name}!</h1>
```

    'use strict'

    module.exports = (File) ->
        {Input} = File
        {Tag, Text} = File.Element
        InputRE = Input.RE

        (file) ->
            {node} = file

            # get inputs
            {inputs} = file

            forNode = (elem) ->
                # text
                if elem instanceof Text
                    {text} = elem
                    InputRE.lastIndex = 0
                    if text and InputRE.test(text)
                        if funcBody = Input.parse(text)
                            `//<production>`
                            text = ''
                            `//</production>`
                            input = new Input.Text file, elem, text, funcBody
                            elem.text = ''
                            inputs.push input

                # props
                else if elem instanceof Tag
                    for name, val of elem.props
                        if elem.props.hasOwnProperty(name) and Input.test(val)
                            if funcBody = Input.parse(val)
                                text = ''
                                `//<development>`
                                text = val
                                `//</development>`
                                input = new Input.Prop file, elem, text, funcBody, name
                                elem.props.set name, null
                                inputs.push input

                    for child in elem.children
                        forNode child
                return

            forNode node