Function match

Compute the match between a document selector and a document. Values greater than zero mean the selector matches the document.

A match is computed according to these rules:

1. When DocumentSelector is an array, compute the match for each contained DocumentFilter or language identifier and take the maximum value.
2. A string will be desugared to become the language-part of a DocumentFilter, so "fooLang" is like { language: "fooLang" }.
3. A DocumentFilter will be matched against the document by comparing its parts with the document. The following rules apply:
4. When the DocumentFilter is empty ({}) the result is 0
5. When scheme, language, or pattern are defined but one doesn’t match, the result is 0
6. Matching against * gives a score of 5, matching via equality or via a glob-pattern gives a score of 10
7. The result is the maximum value of each match

Samples:

// default document from disk (file-scheme)
doc.uri; //'file:///my/file.js'
doc.languageId; // 'javascript'
match('javascript', doc); // 10;
match({language: 'javascript'}, doc); // 10;
match({language: 'javascript', scheme: 'file'}, doc); // 10;
match('*', doc); // 5
match('fooLang', doc); // 0
match(['fooLang', '*'], doc); // 5

// virtual document, e.g. from git-index
doc.uri; // 'git:/my/file.js'
doc.languageId; // 'javascript'
match('javascript', doc); // 10;
match({language: 'javascript', scheme: 'git'}, doc); // 10;
match('*', doc); // 5
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