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import template_formatter from './templateFormatter.js'
// Formats `value` value preserving `caret` at the same character.
//
// `{ value, caret }` attribute is the result of `parse()` function call.
//
// Returns `{ text, caret }` where the new `caret` is the caret position
// inside `text` text corresponding to the original `caret` position inside `value`.
//
// `formatter(value)` is a function returning `{ text, template }`.
//
// `text` is the `value` value formatted using `template`.
// It may either cut off the non-filled right part of the `template`
// or it may fill the non-filled character placeholders
// in the right part of the `template` with `spacer`
// which is a space (' ') character by default.
//
// `template` is the template used to format the `value`.
// It can be either a full-length template or a partial template.
//
// `formatter` can also be a string — a `template`
// where character placeholders are denoted by 'x'es.
// In this case `formatter` function is automatically created.
//
// Example:
//
// `value` is '880',
// `caret` is `2` (before the first `0`)
//
// `formatter` is `'880' =>
// { text: '8 (80 )', template: 'x (xxx) xxx-xx-xx' }`
//
// The result is `{ text: '8 (80 )', caret: 4 }`.
//
export default function format(value, caret, formatter)
{
if (typeof formatter === 'string')
{
formatter = template_formatter(formatter)
}
let { text, template } = formatter(value) || {}
if (text === undefined)
{
text = value
}
if (template)
{
if (caret === undefined)
{
caret = text.length
}
else
{
let index = 0
let found = false
let possibly_last_input_character_index = -1
while (index < text.length && index < template.length)
{
// Character placeholder found
if (text[index] !== template[index])
{
if (caret === 0)
{
found = true
caret = index
break
}
possibly_last_input_character_index = index
caret--
}
index++
}
// If the caret was positioned after last input character,
// then the text caret index is just after the last input character.
if (!found)
{
caret = possibly_last_input_character_index + 1
}
}
}
return { text, caret }
}
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