The existing JavacParser uses bit operations to manage mode flags so you end up with code that looks like:

```
        if (token.kind == LT &&
            (mode & TYPE) != 0 &&
            (mode & NOPARAMS) == 0) {
```

when

```
        if (token.kind == LT &&
            isMode(TYPE) &&
            !isMode(NOPARAMS)) {
```

might be easier to read.

The task is to replace

```
    /** When terms are parsed, the mode determines which is expected:
     * mode = EXPR : an expression
     * mode = TYPE : a type
     * mode = NOPARAMS : no parameters allowed for type
     * mode = TYPEARG : type argument
     * mode |= NOLAMBDA : lambdas are not allowed
     */
    protected static final int EXPR = 0x1;
    protected static final int TYPE = 0x2;
    protected static final int NOPARAMS = 0x4;
    protected static final int TYPEARG = 0x8;
    protected static final int DIAMOND = 0x10;
    protected static final int NOLAMBDA = 0x20;
```

with

```
    /** When terms are parsed, the mode determines which is expected:
     * mode = EXPR : an expression
     * mode = TYPE : a type
     * mode = NOPARAMS : no parameters allowed for type
     * mode = TYPEARG : type argument
     * mode |= NOLAMBDA : lambdas are not allowed
     */
    protected static final int EXPR = 1 << 0;
    protected static final int TYPE = 1 << 1;
    protected static final int NOPARAMS = 1 << 2;
    protected static final int TYPEARG = 1 << 3;
    protected static final int DIAMOND = 1 << 4;
    protected static final int NOLAMBDA = 1 << 5;

    protected void setMode(int mode) {
        this.mode = mode;
    }

    protected void setLastMode(int mode) {
        lastmode = mode;
    }

    protected boolean isMode(int mode) {
        return (this.mode & mode) != 0;
    }

    protected boolean wasTypeMode() {
        return (lastmode & TYPE) != 0;
    }
```