76 lines
2.3 KiB
Java
Executable File
76 lines
2.3 KiB
Java
Executable File
package frontend.ast.exp;
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import frontend.ast.Node;
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import frontend.ast.SyntaxType;
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import frontend.lexer.TokenStream;
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import frontend.lexer.TokenType;
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import frontend.ast.token.TokenNode;
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import frontend.ast.NodeStack;
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import midend.symbol.SymbolManager;
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import error.Errors;
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public class MulExp extends Node {
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public MulExp(TokenStream ts) {
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super(SyntaxType.MUL_EXP, ts);
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}
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public void parse(Errors errors) {
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NodeStack stack = new NodeStack();
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while (true) {
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UnaryExp uep = new UnaryExp(this.ts);
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uep.parse(errors);
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stack.push(uep);
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if (isMulOp()) {
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stack.push(new TokenNode(ts)); // mulop
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} else {
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break;
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}
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}
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if (stack.size() == 1) {
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addChild((UnaryExp)stack.pop());
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} else {
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MulExp temp = this;
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while (stack.size() > 1) {
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MulExp mep = new MulExp(this.ts);
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UnaryExp uep = (UnaryExp) stack.pop();
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TokenNode mulop = (TokenNode) stack.pop();
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temp.addChild(mep);
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temp.addChild(mulop);
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temp.addChild(uep);
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temp = mep;
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}
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temp.addChild((UnaryExp)stack.pop());
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}
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}
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public boolean isMulOp() {
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TokenType t = getCurrToken().getType();
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return t == TokenType.MULT || t == TokenType.DIV || t == TokenType.MOD;
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}
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public int getType() {
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if (getChildren().size() == 1) {
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return ((UnaryExp) getChild(0)).getType();
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} else {
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return ((MulExp) getChild(0)).getType()
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| ((UnaryExp) getChild(2)).getType();
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}
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}
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public int getValue() {
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if (getChild(0) instanceof UnaryExp) {
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return ((UnaryExp) getChild(0)).getValue();
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} else {
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int left = ((MulExp) getChild(0)).getValue();
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int right = ((UnaryExp) getChild(2)).getValue();
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if (((TokenNode) getChild(1)).getType() == TokenType.MULT) {
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return left * right;
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} else if (((TokenNode) getChild(1)).getType() == TokenType.DIV) {
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return left / right;
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} else {
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return left % right;
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}
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}
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}
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}
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