45 lines
1.3 KiB
Java
45 lines
1.3 KiB
Java
package frontend.ast.exp;
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import frontend.ast.Node;
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import frontend.ast.NodeStack;
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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 error.Errors;
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public class LOrExp extends Node {
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public LOrExp(TokenStream ts) {
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super(SyntaxType.LOR_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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LAndExp andexp = new LAndExp(this.ts);
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andexp.parse(errors);
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stack.push(andexp);
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if (getCurrToken().getType() == TokenType.OR) {
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stack.push(new TokenNode(ts)); // lorop
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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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this.addChild((LAndExp)stack.pop());
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} else {
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LOrExp temp = this;
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while(stack.size() > 1) {
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LOrExp loe = new LOrExp(this.ts);
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LAndExp lae = (LAndExp)stack.pop();
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TokenNode lorop = (TokenNode)stack.pop();
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temp.addChild(loe);
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temp.addChild(lorop);
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temp.addChild(lae);
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temp = loe;
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}
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temp.addChild((LAndExp)stack.pop());
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}
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}
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}
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