794 lines
27 KiB
Java
794 lines
27 KiB
Java
package com.annimon.everlastingsummer;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import com.annimon.everlastingsummer.ast.*;
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import com.annimon.everlastingsummer.ast.BinaryExpression.Operator;
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import android.text.TextUtils;
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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, SaveInfo save) {
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if (save == null) instance = new Parser(tokens);
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else instance = new Parser(tokens, save);
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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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public static void release() {
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if (instance != null) {
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instance.tokens.clear();
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instance.labels.clear();
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}
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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, lastPosition;
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private final Map<String, Integer> labels;
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/** Оптимизация, чтобы каждый раз не искать endmenu/endif,
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* если их попросту нет в необработанном сценарии */
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private boolean hasEndMenu, hasEndIf;
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public Parser(List<Token> tokens) {
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this(tokens, 0);
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}
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public Parser(List<Token> tokens, SaveInfo info) {
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this(tokens, info.getPosition());
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Variables.setVariables(info.getVariables());
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}
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private Parser(List<Token> tokens, int position) {
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this.tokens = tokens;
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tokensCount = tokens.size();
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this.position = position;
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lastPosition = position;
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labels = new HashMap<String, Integer>();
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hasEndMenu = false;
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hasEndIf = false;
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preScan();
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Variables.init();
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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 getLastPosition() {
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return lastPosition;
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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 jumpLabel(String label) {
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if (labels.containsKey(label)) {
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position = labels.get(label);
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}
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}
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public void next() {
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lastPosition = position;
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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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if (Logger.DEBUG) Logger.log("Parser.next()", re);
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if (tokens.isEmpty()) return;
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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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public void prevScene() {
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// Для перехода к предыдущей сцене, следует два раза найти токен SCENE,
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// т.к. при первом поиске мы найдём лишь текущую.
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final int currentScene = find(TokenType.SCENE, -1);
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final int pos = findFrom(currentScene, TokenType.SCENE, -1);
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// Если не нашли - перематываем на начало.
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if (pos == position) position = 0;
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else position = pos;
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next();
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}
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public void nextScene() {
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position = find(TokenType.SCENE, 1);
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next();
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}
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private int find(TokenType which, int step) {
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return findFrom(position, which, step);
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}
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private int findFrom(int from, TokenType which, int step) {
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int pos = from;
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while (true) {
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pos += step;
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if (pos < 0 || pos >= tokensCount) break;
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final Token token = tokens.get(pos);
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if (which == token.getType()) return pos;
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}
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// Возвращаем текущее значение во избежание лишних проверок.
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return from;
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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.QUEUE)) return queue();
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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)) return hide();
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if (match(token, TokenType.JUMP)) return jump();
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if (match(token, TokenType.IF)) return ifStatement();
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if (lookMatch(1, TokenType.COLON)) {
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// menu:
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if (match(token, TokenType.MENU)) return menu();
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// Остаток от меню выбора. Пропускаем до появления ENDMENU.
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if (match(token, TokenType.TEXT)) {
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if (hasEndMenu) position += skipMenu();
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return false;
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}
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// Остаток от условного выражения. Пропускаем до появления ENDIF.
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if (match(token, TokenType.ELSE)) {
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if (hasEndIf) position += skipIf();
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return false;
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}
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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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return ViewActivity.getInstance().windowShow(matchWithEffect());
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else if (match(TokenType.HIDE))
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return ViewActivity.getInstance().windowHide(matchWithEffect());
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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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boolean hard = false;
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if (!lookMatch(0, TokenType.RPAREN)) {
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consume(TokenType.WORD); // hard
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consume(TokenType.EQ);
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hard = consumeBoolean();
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}
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().pause((int)(1000 * pause), hard);
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return true;
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}
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if (match(token, TokenType.RENPY_SAY)) {
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consume(TokenType.LPAREN);
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final String whoid = consume(TokenType.WORD).getText();
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// TODO: consume(TokenType.COMMA)
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final String text = consume(TokenType.TEXT).getText();
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// TODO: consume(TokenType.COMMA)
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consume(TokenType.WORD); // interact
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consume(TokenType.EQ);
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final boolean interact = consumeBoolean();
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().text(whoid, text);
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return interact;
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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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if (match(token, TokenType.MAKE_NAMES_KNOWN) ||
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match(token, TokenType.MAKE_NAMES_UNKNOWN)) {
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consume(TokenType.LPAREN);
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consume(TokenType.RPAREN);
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if (token.getType() == TokenType.MAKE_NAMES_KNOWN) {
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ViewActivity.getInstance().makeNamesKnown();
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} else ViewActivity.getInstance().makeNamesUnknown();
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return false;
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}
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if (match(token, TokenType.SET_NAME)) {
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consume(TokenType.LPAREN);
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final String whoid = consume(TokenType.TEXT).getText();
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// TODO: consume(TokenType.COMMA)
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final String name = consume(TokenType.TEXT).getText();
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().meet(whoid, name);
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return false;
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}
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// Карта
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if (match(token, TokenType.DISABLE_ALL_ZONES)) {
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consume(TokenType.LPAREN);
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().disableAllZones();
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return false;
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}
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if (match(token, TokenType.DISABLE_CURRENT_ZONE)) {
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consume(TokenType.LPAREN);
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().disableCurrentZone();
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return false;
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}
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if (match(token, TokenType.RESET_ZONE)) {
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consume(TokenType.LPAREN);
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final String zone = consume(TokenType.TEXT).getText();
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().resetZone(zone);
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return false;
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}
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if (match(token, TokenType.SET_ZONE)) {
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consume(TokenType.LPAREN);
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final String zone = consume(TokenType.TEXT).getText();
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// TODO: consume(TokenType.COMMA)
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final String label = consume(TokenType.TEXT).getText();
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().setZone(zone, label);
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return false;
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}
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if (match(token, TokenType.SHOW_MAP)) {
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consume(TokenType.LPAREN);
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consume(TokenType.RPAREN);
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ViewActivity.getInstance().showMap();
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return true;
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}
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if (match(token, TokenType.WORD)) {
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if (match(TokenType.EQ)) {
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// variable = expression
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Variables.setVariable(token.getText(), expression().eval());
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return false;
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}
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if (lookMatch(1, TokenType.EQ) && match(TokenType.PLUS)) {
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// variable += expression
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consume(TokenType.EQ);
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final double varValue = Variables.getVariable(token.getText());
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Variables.setVariable(token.getText(), varValue + expression().eval());
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return false;
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}
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if (lookMatch(1, TokenType.EQ) && match(TokenType.MINUS)) {
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// variable -= expression
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consume(TokenType.EQ);
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final double varValue = Variables.getVariable(token.getText());
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Variables.setVariable(token.getText(), varValue - expression().eval());
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return false;
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}
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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 true;
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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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// Псевдоним (для показа одно и того же спрайта в разных местах)
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String alias = "";
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if (match(TokenType.AS)) {
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alias = consume(TokenType.WORD).getText();
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}
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final String effect = matchWithEffect();
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ViewActivity.getInstance().sprite(whoid, params, position, alias, effect);
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return false;
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}
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private boolean hide() {
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final String whoid = consume(TokenType.WORD).getText();
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final String effect = matchWithEffect();
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ViewActivity.getInstance().hideSprite(whoid, effect);
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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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final String name = consumeMusicName();
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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 = consumeMusicName();
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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 queue() {
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if (match(TokenType.MUSIC)) return queueMusic();
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if (match(TokenType.SOUND)) return queueSound();
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return false;
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}
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private boolean queueMusic() {
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final String name = consumeMusicName();
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ViewActivity.getInstance().addMusicToQueue(name);
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return false;
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}
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private boolean queueSound() {
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final String name = consumeMusicName();
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ViewActivity.getInstance().addSoundToQueue(name);
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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 boolean menu() {
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// menu: title?
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consume(TokenType.COLON);
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String title = null;
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if (lookMatch(0, TokenType.TEXT) && !lookMatch(1, TokenType.COLON)) {
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title = consume(TokenType.TEXT).getText();
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}
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if (!hasEndMenu) return false;
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// Ищем элементы выбора
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final Menu menu = new Menu(title);
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int pos = 0;
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int level = 1; // уровень вложенности меню
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while (true) {
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// Расчёт уровня меню.
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if (lookMatch(pos, TokenType.MENU) && lookMatch(pos + 1, TokenType.COLON)) {
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level++;
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pos++;
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}
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if (lookMatch(pos, TokenType.ENDMENU)) {
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level--;
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// Завершаем работу по достижению ENDMENU первого уровня.
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if (level <= 0) break;
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}
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if (level == 1) {
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// Добавляем только пункты из меню первого уровня.
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if (lookMatch(pos, TokenType.TEXT) && lookMatch(pos + 1, TokenType.COLON)) {
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menu.addItem(get(pos).getText(), position + pos + 2);
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pos++;
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}
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}
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if (lookMatch(pos, TokenType.EOF)) return false;
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pos++;
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}
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ViewActivity.getInstance().menu(menu);
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return true;
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}
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private boolean jump() {
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final String labelName = consume(TokenType.WORD).getText();
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jumpLabel(labelName);
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return false;
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}
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private boolean ifStatement() {
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final Expression condition = expression();
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consume(TokenType.COLON);
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if (!hasEndIf) return false;
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if (condition.eval() == 0) {
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// Если условие не верно, пропускаем блок до следующего ENDIF
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int pos = 0;
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int level = 1; // уровень вложенности блока
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while (true) {
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// Расчёт уровня блока.
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if (lookMatch(pos, TokenType.IF)) {
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level++;
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pos++;
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}
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if (lookMatch(pos, TokenType.ELSE)) {
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level--;
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pos += 2; // пропускаем ELSE и двоеточие
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// Завершаем работу по достижению ELSE первого уровня.
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if (level <= 0) break;
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}
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if (lookMatch(pos, TokenType.ENDIF)) {
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level--;
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// Завершаем работу по достижению ENDIF первого уровня.
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if (level <= 0) break;
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}
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if (lookMatch(pos, TokenType.EOF)) return false;
|
||
pos++;
|
||
}
|
||
position += pos;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
private Expression expression() {
|
||
return orTest();
|
||
}
|
||
|
||
private Expression orTest() {
|
||
Expression expression = andTest();
|
||
|
||
while (true) {
|
||
if (match(TokenType.OR)) {
|
||
expression = new BinaryExpression(Operator.BOOLEAN_OR, expression, andTest());
|
||
continue;
|
||
}
|
||
break;
|
||
}
|
||
|
||
return expression;
|
||
}
|
||
|
||
private Expression andTest() {
|
||
Expression expression = notTest();
|
||
|
||
while (true) {
|
||
if (match(TokenType.AND)) {
|
||
expression = new BinaryExpression(Operator.BOOLEAN_AND, expression, notTest());
|
||
continue;
|
||
}
|
||
break;
|
||
}
|
||
|
||
return expression;
|
||
}
|
||
|
||
private Expression notTest() {
|
||
if (match(TokenType.NOT)) {
|
||
return new ValueExpression( notTest().eval() != 0 ? 0 : 1 );
|
||
}
|
||
return comparison();
|
||
}
|
||
|
||
private Expression comparison() {
|
||
Expression expression = additive();
|
||
|
||
while (true) {
|
||
if (lookMatch(1, TokenType.EQ)) {
|
||
if (match(TokenType.EQ)) {
|
||
// ==
|
||
consume(TokenType.EQ);
|
||
expression = new BinaryExpression(Operator.EQUALS, expression, additive());
|
||
continue;
|
||
}
|
||
if (match(TokenType.GT)) {
|
||
// >=
|
||
consume(TokenType.EQ);
|
||
expression = new BinaryExpression(Operator.GTEQ, expression, additive());
|
||
continue;
|
||
}
|
||
if (match(TokenType.LT)) {
|
||
// <=
|
||
consume(TokenType.EQ);
|
||
expression = new BinaryExpression(Operator.LTEQ, expression, additive());
|
||
continue;
|
||
}
|
||
if (match(TokenType.EXCL)) {
|
||
// !=
|
||
consume(TokenType.EQ);
|
||
expression = new BinaryExpression(Operator.NOTEQUALS, expression, additive());
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (match(TokenType.LT)) {
|
||
expression = new BinaryExpression(Operator.LT, expression, additive());
|
||
continue;
|
||
}
|
||
if (match(TokenType.GT)) {
|
||
expression = new BinaryExpression(Operator.GT, expression, additive());
|
||
continue;
|
||
}
|
||
break;
|
||
}
|
||
return expression;
|
||
}
|
||
|
||
private Expression additive() {
|
||
Expression expression = unary();
|
||
|
||
while (true) {
|
||
if (match(TokenType.PLUS)) {
|
||
expression = new BinaryExpression(Operator.ADD, expression, unary());
|
||
continue;
|
||
}
|
||
if (match(TokenType.MINUS)) {
|
||
expression = new BinaryExpression(Operator.SUBTRACT, expression, unary());
|
||
continue;
|
||
}
|
||
break;
|
||
}
|
||
|
||
return expression;
|
||
}
|
||
|
||
private Expression unary() {
|
||
if (match(TokenType.MINUS)) {
|
||
return new ValueExpression( -primary().eval() );
|
||
}
|
||
if (match(TokenType.PLUS)) {
|
||
return primary();
|
||
}
|
||
return primary();
|
||
}
|
||
|
||
private Expression primary() {
|
||
final Token current = get(0);
|
||
if (match(current, TokenType.NUMBER)) {
|
||
return new ValueExpression( Double.parseDouble(current.getText()) );
|
||
}
|
||
if (match(current, TokenType.WORD)) {
|
||
return new VariableExpression(current.getText());
|
||
}
|
||
if (match(current, TokenType.LPAREN)) {
|
||
Expression expr = expression();
|
||
match(TokenType.RPAREN);
|
||
return expr;
|
||
}
|
||
throw new RuntimeException();
|
||
}
|
||
|
||
private void preScan() {
|
||
// Сканируем все метки, для быстрого перехода командой jump.
|
||
// А также определяем параметры для оптимизации.
|
||
for (int i = 0; i < tokensCount - 2; i++) {
|
||
final TokenType current = tokens.get(i).getType();
|
||
if (current == TokenType.ENDMENU) {
|
||
hasEndMenu = true;
|
||
} else if (current == TokenType.ENDIF) {
|
||
hasEndIf = true;
|
||
} else if ( (current == TokenType.LABEL) &&
|
||
(tokens.get(i + 2).getType() == TokenType.COLON) ) {
|
||
// label word :
|
||
final Token token = tokens.get(i + 1);
|
||
if (token.getType() == TokenType.WORD) {
|
||
// Добавляем позицию команды, следующей после метки.
|
||
labels.put(token.getText(), i + 3);
|
||
}
|
||
i += 2;
|
||
}
|
||
}
|
||
}
|
||
|
||
private int skipMenu() {
|
||
int pos = 0;
|
||
int level = 1; // уровень вложенности меню
|
||
while (true) {
|
||
// Расчёт уровня меню.
|
||
if (lookMatch(pos, TokenType.MENU) && lookMatch(pos + 1, TokenType.COLON)) {
|
||
level++;
|
||
pos += 2;
|
||
}
|
||
if (lookMatch(pos, TokenType.ENDMENU)) {
|
||
pos++;
|
||
level--;
|
||
// Завершаем работу по достижению ENDMENU первого уровня.
|
||
if (level <= 0) break;
|
||
}
|
||
if (lookMatch(pos, TokenType.EOF)) return 0;
|
||
pos++;
|
||
}
|
||
return pos;
|
||
}
|
||
|
||
private int skipIf() {
|
||
int pos = 0;
|
||
int level = 1;
|
||
while (true) {
|
||
if (lookMatch(pos, TokenType.IF)) level++;
|
||
else if (lookMatch(pos, TokenType.ENDIF)) {
|
||
pos++;
|
||
level--;
|
||
if (level <= 0) break;
|
||
} else if (lookMatch(pos, TokenType.EOF)) return 0;
|
||
pos++;
|
||
}
|
||
return pos;
|
||
}
|
||
|
||
|
||
private double consumeDouble() {
|
||
return Double.parseDouble(consume(TokenType.NUMBER).getText());
|
||
}
|
||
|
||
private boolean consumeBoolean() {
|
||
return "true".equalsIgnoreCase(consume(TokenType.WORD).getText());
|
||
}
|
||
|
||
private String consumeMusicName() {
|
||
final String name;
|
||
if (lookMatch(1, TokenType.LBRACKET)) {
|
||
// music_list["music"]
|
||
consume(TokenType.WORD);
|
||
consume(TokenType.LBRACKET);
|
||
name = consume(TokenType.TEXT).getText();
|
||
consume(TokenType.RBRACKET);
|
||
} else if (lookMatch(0, TokenType.TEXT)) {
|
||
name = consume(TokenType.TEXT).getText();
|
||
} else {
|
||
name = consume(TokenType.WORD).getText();
|
||
}
|
||
return name;
|
||
}
|
||
|
||
private FadeInfo matchFade() {
|
||
final FadeInfo result = new FadeInfo();
|
||
if (match(TokenType.FADEIN)) {
|
||
result.setIn(true);
|
||
result.setDuration(consumeDouble());
|
||
} else if (match(TokenType.FADEOUT)) {
|
||
result.setOut(true);
|
||
result.setDuration(consumeDouble());
|
||
}
|
||
return result;
|
||
}
|
||
|
||
private String matchWithEffect() {
|
||
if (match(TokenType.WITH)) {
|
||
return consume(TokenType.WORD).getText();
|
||
}
|
||
return "";
|
||
}
|
||
|
||
|
||
private boolean match(TokenType type) {
|
||
if (get(0).getType() != type) return false;
|
||
position++;
|
||
return true;
|
||
}
|
||
|
||
private boolean match(Token token, TokenType type) {
|
||
if (type != token.getType()) return false;
|
||
position++;
|
||
return true;
|
||
}
|
||
|
||
private Token consume(TokenType type) {
|
||
if (get(0).getType() != type) throw new RuntimeException("Ожидался токен " + type + ".");
|
||
return tokens.get(position++);
|
||
}
|
||
|
||
private boolean lookMatch(int pos, TokenType type) {
|
||
return (type == get(pos).getType());
|
||
}
|
||
|
||
private Token get(int offset) {
|
||
if (position + offset >= tokensCount) return EOF;
|
||
return tokens.get(position + offset);
|
||
}
|
||
}
|