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import { count_occurences } from './helpers.js'
import close_braces from './closeBraces.js'
// Takes a `template` where character placeholders
// are denoted by 'x'es (e.g. 'x (xxx) xxx-xx-xx').
//
// Returns a function which takes `value` characters
// and returns the `template` filled with those characters.
// If the `template` can only be partially filled
// then it is cut off.
//
// If `should_close_braces` is `true`,
// then it will also make sure all dangling braces are closed,
// e.g. "8 (8" -> "8 (8 )" (iPhone style phone number input).
//
export default function(template, placeholder = 'x', should_close_braces)
{
if (!template)
{
return value => ({ text: value })
}
const characters_in_template = count_occurences(placeholder, template)
return function(value)
{
if (!value)
{
return { text: '', template }
}
let value_character_index = 0
let filled_in_template = ''
// Using `.split('')` here instead of normal `for ... of`
// because the importing application doesn't neccessarily include an ES6 polyfill.
// The `.split('')` approach discards "exotic" UTF-8 characters
// (the ones consisting of four bytes)
// but template placeholder characters don't fall into that range
// and appending UTF-8 characters to a string in parts still works.
for (const character of template.split(''))
{
if (character !== placeholder)
{
filled_in_template += character
continue
}
filled_in_template += value[value_character_index]
value_character_index++
// If the last available value character has been filled in,
// then return the filled in template
// (either trim the right part or retain it,
// if no more character placeholders in there)
if (value_character_index === value.length)
{
// If there are more character placeholders
// in the right part of the template
// then simply trim it.
if (value.length < characters_in_template)
{
break
}
}
}
if (should_close_braces)
{
filled_in_template = close_braces(filled_in_template, template)
}
return { text: filled_in_template, template }
}
}
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