![]() ![]() *: What we were doing was plain wrong and "approximate" is a very nice word for it :). For the line below, we would get the following tokens from our hand-written tokenizers: tokens = In the past, we wrote tokenizers by hand (there is no feasible way to interpret TextMate grammars in the browser even today, but that's another story). One requirement we had was to reduce memory usage. It was shipped in the form of the Monaco Editor in various Microsoft projects, including Internet Explorer's F12 tools. The code for the editor in VS Code was written long before VS Code existed. More rarely, typing on a line results in a retokenization/repaint of the current line and some of the ones below (until an equal end state is encountered): Most of the time, typing on a line results in only that line being retokenized, as the tokenizer returns the same end state and the editor can assume the following lines are not getting new tokens: This is a technique used by many tokenization engines, including TextMate grammars, that allows an editor to retokenize only a small subset of the lines when the user makes edits. A tokenizer can store some state at the end of a tokenized line, which will be passed back when tokenizing the next line. Tokenization in VS Code (and in the Monaco Editor) runs line-by-line, from top to bottom, in a single pass. ![]() It is the one feature that turns a text editor into a code editor. Tokens are assigned to source code, and then they are targeted by a theme, assigned colors, and voilà, your source code is rendered with colors. The most similar editor to Sublime Text is TextMate.It was a pretty solid option back in the beginning of Ruby on Rails.It was used by Ryan Bates in RailsCasts, so many people followed Ryan’s. Syntax Highlighting usually consists of two phases. TL DR TextMate themes will look more like their authors intended in VS Code 1.9, while being rendered faster and with less memory consumption. Visual Studio Code version 1.9 includes a cool performance improvement that we've been working on and I wanted to tell its story.
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