Function chain

static/editor.md/lib/codemirror/mode/velocity/velocity.js:28–31

(stream, state, f)

    var isOperatorChar = /[+\-*&%=<>!?:\/|]/;

    function chain(stream, state, f) {
        state.tokenize = f;
        return f(stream, state);
    }
    function tokenBase(stream, state) {
        var beforeParams = state.beforeParams;
        state.beforeParams = false;