The concept of [Textualism](https://en.wikipedia.org/wiki/Textualism) has as its main focus the precise letter of the law.

What is the name of the opposite concept?

An opposite concept would be where focus also is given to non-textual sources, such as: 

1. intention of the law when passed,
2. the problem it was intended to remedy
3. Significant questions regarding the justice or rectitude of the law.