Add pre scan and parsing expressions
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Victor
parent
921f9836b2
commit
4a7f2a8f88
@ -1,4 +1,4 @@
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/* global TokenType, ViewActivity, TextUtils */
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/* global TokenType, ViewActivity, TextUtils, Variables, Operator */
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function Parser(tokens) {
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this.tokens = tokens;
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@ -6,6 +6,11 @@ function Parser(tokens) {
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this.position = 0;
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this.lastPosition = 0;
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this.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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this.hasEndMenu = false;
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this.hasEndIf = false;
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Variables.init();
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}
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Parser.prototype.EOF = new Token("", TokenType.EOF);
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@ -212,27 +217,27 @@ Parser.prototype.command = function() {
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return true;
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}
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/*if (this.match(token, TokenType.WORD)) {
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if (this.match(token, TokenType.WORD)) {
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if (this.match(TokenType.EQ)) {
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// variable = expression
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Variables.setVariable(token.getText(), expression().eval());
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Variables.setVariable(token.getText(), this.expression().eval());
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return false;
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}
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if (this.lookMatch(1, TokenType.EQ) && this.match(TokenType.PLUS)) {
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// variable += expression
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this.consume(TokenType.EQ);
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var varValue = Variables.getVariable(token.getText());
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Variables.setVariable(token.getText(), varValue + expression().eval());
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Variables.setVariable(token.getText(), varValue + this.expression().eval());
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return false;
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}
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if (this.lookMatch(1, TokenType.EQ) && this.match(TokenType.MINUS)) {
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// variable -= expression
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this.consume(TokenType.EQ);
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var varValue = Variables.getVariable(token.getText());
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Variables.setVariable(token.getText(), varValue - expression().eval());
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Variables.setVariable(token.getText(), varValue - this.expression().eval());
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return false;
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}
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}*/
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}
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return false;
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};
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@ -312,6 +317,192 @@ Parser.prototype.playAmbience = function() {
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return false;
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};
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Parser.prototype.expression = function() {
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return this.orTest();
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};
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Parser.prototype.orTest = function() {
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var expression = this.andTest();
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while (true) {
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if (this.match(TokenType.OR)) {
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expression = new BinaryExpression(Operator.BOOLEAN_OR, expression, this.andTest());
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continue;
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}
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break;
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}
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return expression;
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};
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Parser.prototype.andTest = function() {
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var expression = this.notTest();
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while (true) {
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if (this.match(TokenType.AND)) {
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expression = new BinaryExpression(Operator.BOOLEAN_AND, expression, this.notTest());
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continue;
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}
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break;
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}
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return expression;
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};
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Parser.prototype.notTest = function() {
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if (this.match(TokenType.NOT)) {
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return new ValueExpression( this.notTest().eval() != 0 ? 0 : 1 );
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}
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return this.comparison();
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};
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Parser.prototype.comparison = function() {
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var expression = this.additive();
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while (true) {
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if (this.lookMatch(1, TokenType.EQ)) {
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if (this.match(TokenType.EQ)) {
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// ==
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this.consume(TokenType.EQ);
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expression = new BinaryExpression(Operator.EQUALS, expression, this.additive());
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continue;
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}
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if (this.match(TokenType.GT)) {
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// >=
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this.consume(TokenType.EQ);
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expression = new BinaryExpression(Operator.GTEQ, expression, this.additive());
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continue;
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}
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if (this.match(TokenType.LT)) {
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// <=
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this.consume(TokenType.EQ);
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expression = new BinaryExpression(Operator.LTEQ, expression, this.additive());
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continue;
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}
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if (this.match(TokenType.EXCL)) {
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// !=
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this.consume(TokenType.EQ);
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expression = new BinaryExpression(Operator.NOTEQUALS, expression, this.additive());
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continue;
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}
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}
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if (this.match(TokenType.LT)) {
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expression = new BinaryExpression(Operator.LT, expression, this.additive());
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continue;
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}
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if (this.match(TokenType.GT)) {
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expression = new BinaryExpression(Operator.GT, expression, this.additive());
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continue;
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}
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break;
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}
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return expression;
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};
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Parser.prototype.additive = function() {
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var expression = this.unary();
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while (true) {
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if (this.match(TokenType.PLUS)) {
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expression = new BinaryExpression(Operator.ADD, expression, this.unary());
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continue;
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}
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if (this.match(TokenType.MINUS)) {
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expression = new BinaryExpression(Operator.SUBTRACT, expression, this.unary());
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continue;
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}
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break;
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}
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return expression;
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};
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Parser.prototype.unary = function() {
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if (this.match(TokenType.MINUS)) {
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return new ValueExpression( -this.primary().eval() );
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}
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if (this.match(TokenType.PLUS)) {
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return this.primary();
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}
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return this.primary();
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};
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Parser.prototype.primary = function() {
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var current = this.get(0);
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if (this.match(current, TokenType.NUMBER)) {
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return new ValueExpression( parseFloat(current.getText()) );
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}
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if (this.match(current, TokenType.WORD)) {
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return new VariableExpression(current.getText());
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}
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if (this.match(current, TokenType.LPAREN)) {
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var expr = this.expression();
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this.match(TokenType.RPAREN);
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return expr;
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}
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throw "Неизвестное выражение";
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};
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Parser.prototype.preScan = function() {
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// Сканируем все метки, для быстрого перехода командой jump.
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// А также определяем параметры для оптимизации.
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for (var i = 0; i < this.tokensCount - 2; i++) {
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var current = this.tokens[i].getType();
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if (current === TokenType.ENDMENU) {
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this.hasEndMenu = true;
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} else if (current === TokenType.ENDIF) {
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this.hasEndIf = true;
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} else if ( (current === TokenType.LABEL) &&
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(this.tokens[i + 2].getType() === TokenType.COLON) ) {
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// label word :
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var token = this.tokens[i + 1];
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if (token.getType() === TokenType.WORD) {
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// Добавляем позицию команды, следующей после метки.
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this.labels[token.getText()] = i + 3;
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}
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i += 2;
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}
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}
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};
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Parser.prototype.skipMenu = function() {
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var pos = 0;
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var level = 1; // уровень вложенности меню
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while (true) {
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// Расчёт уровня меню.
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if (this.lookMatch(pos, TokenType.MENU) && this.lookMatch(pos + 1, TokenType.COLON)) {
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level++;
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pos += 2;
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}
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if (this.lookMatch(pos, TokenType.ENDMENU)) {
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pos++;
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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 (this.lookMatch(pos, TokenType.EOF)) return 0;
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pos++;
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}
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return pos;
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};
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Parser.prototype.skipIf = function() {
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var pos = 0;
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var level = 1;
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while (true) {
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if (this.lookMatch(pos, TokenType.IF)) level++;
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else if (this.lookMatch(pos, TokenType.ENDIF)) {
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pos++;
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level--;
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if (level <= 0) break;
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} else if (this.lookMatch(pos, TokenType.EOF)) return 0;
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pos++;
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}
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return pos;
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};
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Parser.prototype.consumeMusicName = function() {
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var name = "";
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@ -2,6 +2,7 @@
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function Views(parser) {
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this.parser = parser;
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parser.preScan();
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this.windowTag = document.getElementById("window");
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this.textAuthorTag = document.getElementById("textAuthor");
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