290 lines
9.0 KiB
Java
290 lines
9.0 KiB
Java
package com.annimon.everlastingsummer;
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import java.util.List;
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import android.text.TextUtils;
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import android.util.Log;
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/**
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* @author aNNiMON
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*/
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public final class Parser {
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private static final Token EOF = new Token("", TokenType.EOF);
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private static Parser instance;
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public static Parser parse(List<Token> tokens) {
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instance = new Parser(tokens);
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return instance;
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}
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public static Parser getInstance() {
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return instance;
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}
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private final List<Token> tokens;
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private final int tokensCount;
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private int position;
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public Parser(List<Token> tokens) {
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this.tokens = tokens;
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tokensCount = tokens.size();
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position = 0;
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}
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public List<Token> getTokens() {
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return tokens;
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}
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public int getTokensCount() {
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return tokensCount;
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}
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public int getPosition() {
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return position;
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}
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public void setPosition(int position) {
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this.position = position;
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next();
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}
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public void next() {
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// Команды разделяются на терминальные и нетерминальные.
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// Нетерминальные подготавливают сцену к выводу.
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// Терминальные выводят всё на экран и ожидают следующего вызова.
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boolean terminal = false;
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int counter = 0;
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do {
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try {
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terminal = statement();
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} catch (RuntimeException re) {
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Log.e("Parser", re.getMessage(), re);
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}
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// антизацикливание
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counter++;
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if (counter >= 1000) {
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position++;
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counter = 0;
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}
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} while (!terminal);
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}
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private boolean statement() {
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// http://www.renpy.org/wiki/renpy/doc/reference/The_Ren%27Py_Language#Grammar_Rules
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final Token token = get(0);
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if (match(token, TokenType.COMMAND)) return command();
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if (match(token, TokenType.SCENE)) return scene();
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if (match(token, TokenType.PLAY)) return play();
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if (match(token, TokenType.STOP)) return stop();
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if (match(token, TokenType.SHOW)) return show();
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if (match(token, TokenType.HIDE)) {
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ViewActivity.getInstance().hideSprite(consume(TokenType.WORD).getText());
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return false;
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}
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// Текст с именем автора реплики.
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if (lookMatch(1, TokenType.TEXT) && match(token, TokenType.WORD)) {
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final String whoid = token.getText();
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ViewActivity.getInstance().text(whoid, consume(TokenType.TEXT).getText());
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return true;
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}
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// Обычный текст.
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if (match(token, TokenType.TEXT)) {
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ViewActivity.getInstance().text(token.getText());
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return true;
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}
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if (match(token, TokenType.EOF)) {
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ViewActivity.getInstance().finish();
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return true;
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}
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if (match(token, TokenType.WINDOW)) {
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if (match(TokenType.SHOW))
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ViewActivity.getInstance().windowShow();
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else if (match(TokenType.HIDE))
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ViewActivity.getInstance().windowHide();
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return false;
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}
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if (!TextUtils.isEmpty(matchWithEffect())) return false;
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position++;
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return false;
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}
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/**
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* Парсинг команд на языке Python. Начинаются на $.
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* Поддерживается только самое нужное, весь питон я вам не интерпретирую.
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*/
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private boolean command() {
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final Token token = get(0);
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if (match(token, TokenType.RENPY_PAUSE)) {
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consume(TokenType.LPAREN);
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final double pause = consumeDouble();
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ViewActivity.getInstance().pause((int)(1000 * pause));
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consume(TokenType.RPAREN);
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return true;
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}
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if (match(token, TokenType.PERSISTENT_SPRITE_TIME)) {
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consume(TokenType.EQ);
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consume(TokenType.TEXT);
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return false;
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}
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if (match(token, TokenType.PROLOG_TIME) ||
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match(token, TokenType.DAY_TIME) ||
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match(token, TokenType.SUNSET_TIME) ||
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match(token, TokenType.NIGHT_TIME)) {
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consume(TokenType.LPAREN);
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consume(TokenType.RPAREN);
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return false;
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}
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return false;
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}
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private boolean scene() {
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String type;
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if (match(TokenType.BG)) type = "bg";
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else if (match(TokenType.CG)) type = "cg";
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else if (match(TokenType.ANIM)) type = "anim";
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else type = "";
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final String name = consume(TokenType.WORD).getText();
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final String effect = matchWithEffect();
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ViewActivity.getInstance().background(type, name, effect);
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return false;
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}
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private boolean show() {
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final String whoid = consume(TokenType.WORD).getText();
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String params = ""; // emotion? cloth? distance?
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while (lookMatch(0, TokenType.WORD)) {
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final String text = consume(TokenType.WORD).getText();
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params += text;
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if (text.equals("close") || text.equals("far")) break;
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}
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// Положение (left, cleft, ...)
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String position = "";
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if (match(TokenType.AT)) {
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position = consume(TokenType.WORD).getText();
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}
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matchWithEffect();
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ViewActivity.getInstance().sprite(whoid, params, position);
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return false;
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}
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private boolean play() {
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if (match(TokenType.MUSIC)) return playMusic();
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if (match(TokenType.AMBIENCE)) return playAmbience();
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if (lookMatch(0, TokenType.SOUND) || lookMatch(0, TokenType.SOUNDLOOP)) {
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return playSound();
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}
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return false;
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}
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private boolean playMusic() {
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consume(TokenType.WORD);
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consume(TokenType.LBRACKET);
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final String name = consume(TokenType.TEXT).getText();
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consume(TokenType.RBRACKET);
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final FadeInfo fade = matchFade();
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ViewActivity.getInstance().music(name, fade);
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return false;
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}
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private boolean playSound() {
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boolean loop = false;
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if (match(TokenType.SOUND)) loop = false;
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else if (match(TokenType.SOUNDLOOP)) loop = true;
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final String name = consume(TokenType.WORD).getText();
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final FadeInfo fade = matchFade();
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ViewActivity.getInstance().sound(name, loop, fade);
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return false;
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}
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private boolean playAmbience() {
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// Ambient не реализован, но парсится.
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final String name = consume(TokenType.WORD).getText();
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final FadeInfo fade = matchFade();
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// ViewActivity.getInstance().sound(name, loop, fade);
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return false;
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}
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private boolean stop() {
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if (match(TokenType.MUSIC)) {
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final FadeInfo fade = matchFade();
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ViewActivity.getInstance().stopMusic(fade);
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}
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if (match(TokenType.SOUND) || match(TokenType.SOUNDLOOP)) {
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final FadeInfo fade = matchFade();
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ViewActivity.getInstance().stopSound(fade);
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}
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if (match(TokenType.AMBIENCE)) {
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final FadeInfo fade = matchFade();
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// ViewActivity.getInstance().stopMusic(fade);
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}
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return false;
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}
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private double consumeDouble() {
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return Double.parseDouble(consume(TokenType.NUMBER).getText());
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}
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private FadeInfo matchFade() {
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final FadeInfo result = new FadeInfo();
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if (match(TokenType.FADEIN)) {
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result.setIn(true);
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result.setDuration(consumeDouble());
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} else if (match(TokenType.FADEOUT)) {
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result.setOut(true);
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result.setDuration(consumeDouble());
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}
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return result;
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}
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private String matchWithEffect() {
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if (match(TokenType.WITH)) {
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return consume(TokenType.WORD).getText();
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}
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return "";
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}
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private boolean match(TokenType type) {
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if (get(0).getType() != type) return false;
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position++;
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return true;
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}
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private boolean match(Token token, TokenType type) {
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if (type != token.getType()) return false;
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position++;
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return true;
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}
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private Token consume(TokenType type) {
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if (get(0).getType() != type) throw new RuntimeException("Ожидался токен " + type + ".");
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return tokens.get(position++);
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}
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private boolean lookMatch(int pos, TokenType type) {
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return (type == get(pos).getType());
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}
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private Token get(int offset) {
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if (position + offset >= tokensCount) return EOF;
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return tokens.get(position + offset);
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}
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}
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