Invert If

This is a preview for the invert-if Extension that allows you to quickly and easily invert if blocks, merge nested if blocks, invert conditions and create guard clauses. It also provides the option to generate truth tables to verify update if conditions.

• Features
  • Commands
    • Truth Tables
• Language Support
• Extension Settings
• Known Issues
• Contributing

Features

While still in active development, the following features are already available:

Commands

The selection is currently only the condition under the active cursors, but more fine grained control will be available. The commands take into account all cursors, so multiple selections are possible.

Truth Tables

Truth tables can be used to compare or analyze if conditions as well as verify the inversion process of the extension. They are currently provided using a temporary markdown document:

(1) `a > b || c == d && e !== f`
(2) `a <= b && (c != d || e === f)`

| a > b | c == d | e === f | (1)   | (2)   |
| ----- | ------ | ------- | ----- | ----- |
| false | false  | false   | false | true  |
| false | false  | true    | true  | false |
| false | true   | false   | false | true  |
| false | true   | true    | true  | false |
| true  | false  | false   | true  | false |
| true  | false  | true    | true  | false |
| true  | true   | false   | true  | false |
| true  | true   | true    | true  | false |

To make it possible for tables to be compared, some operators are flipped to their simplest version, e.g. !== to == or <= to >.

Language Support

Currently only the following languages are supported. I plan to add more but I need to find a way without bloating the extension with too many AST parsers / generators:

• javascript
• typescript

You can add additional language support by providing an extension that registers itself with Invert If.

Extension Settings

Known Issues

There are most likely a few Bugs, but the tests are in the process of being expanded.

Contributing

There are currently no feature contributions required, but when you encounter an error or weird behavior feel free to open an issue. I still need a lot of test data to provide solid fixtures for all edge cases.

You can also add additional language support by providing an extension that registers itself with Invert If.