Exceptions

phil/text-diff

Every exception implements Phil\TextDiff\Exception\TextDiffException, and each extends InvalidArgumentException.

Exception	Thrown when
`InvalidText`	a text given to `compare()`, `words()`, `lines()`, `paragraphs()` or `html()` — or a text field of a document — is not valid UTF-8
`InvalidConfiguration`	`TextDiff` is built with a negative bound of edits

The messages name what is wrong:

The text cannot be compared: it is not valid UTF-8.
The number of edits searched for cannot be negative; got -1.

documentToHtml() lets through Phil\Ujo\Exception\UnknownBlockType from phil/ujo when the renderer has nothing for a block's type. Comparing documents never throws on their structure: any two Document values can be compared.