RustLexer.java

/*
 * Copyright (C) 2015 drrb
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.github.drrb.rust.netbeans.rustbridge;

import com.github.drrb.rust.netbeans.parsing.RustTokenId;

/**
 *
 */
public class RustLexer {
    public static final RustLexer NULL_LEXER = new RustLexer((NativeRustLexer) null) {
        @Override public void release() {}

        @Override
        public RustToken.ByValue nextToken() {
            RustToken.ByValue token = new RustToken.ByValue();
            token.type = RustTokenId.EOF.ordinal();
            return token;
        }

    };

    public static RustLexer forString(String input) {
        if (input.isEmpty()) {
            return NULL_LEXER;
        } else {
            return new RustLexer(input);
        }
    }

    private final NativeRustLexer peer;

    public RustLexer(String input) {
        this(RustNative.INSTANCE.createLexer(input));
    }

    public RustLexer(NativeRustLexer peer) {
        this.peer = peer;
    }

    public RustToken nextToken() {
        RustNative.TokenHolder tokenHolder = new RustNative.TokenHolder();
        RustNative.INSTANCE.getNextToken(peer, tokenHolder);
        return tokenHolder.getToken();
    }

    public void release() {
        RustNative.INSTANCE.destroyLexer(peer);
    }
}