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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2023, 2024 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.aspectj.org.eclipse.jdt.internal.compiler.ast;

import org.aspectj.org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.aspectj.org.eclipse.jdt.internal.compiler.codegen.ConstantPool;
import org.aspectj.org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.aspectj.org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.aspectj.org.eclipse.jdt.internal.compiler.impl.Constant;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeIds;
import org.aspectj.org.eclipse.jdt.internal.compiler.util.Util;

public class StringTemplate extends Expression {
	private StringLiteral[] fragments;
	private Expression[] values;
	public boolean isMultiline;
	public StringTemplate(StringLiteral[] fragments, Expression[] values, int start, int end, boolean isMultiline) {
		this.fragments = fragments;
		this.values = values;
		this.sourceStart = start;
		this.sourceEnd = end;
		this.isMultiline = isMultiline;
	}

    public StringLiteral[] fragments() {
		return this.fragments;
    }
    public Expression[] values() {
		return this.values;
    }
	@Override
	public void resolve(BlockScope scope) {
		for (StringLiteral frag : this.fragments) {
			frag.resolveType(scope);
		}
		for (Expression exp : this.values) {
			if (exp == null) {
				continue;
			}
			exp.resolveType(scope);
		}
	}

	@Override
	public TypeBinding resolveType(BlockScope scope) {
		this.constant = Constant.NotAConstant;
		return this.resolvedType = scope.getJavaLangStringTemplate();
	}

	private void generateNewTemplateBootstrap(CodeStream codeStream) {
		int index = codeStream.classFile.recordBootstrapMethod(this);
		// Kludge, see if this can be moved to CodeStream
		codeStream.stackDepth ++;
		if (codeStream.stackDepth > codeStream.stackMax) {
			codeStream.stackMax = codeStream.stackDepth;
		}
		StringBuilder signature = new StringBuilder("("); //$NON-NLS-1$
		for (Expression exp : this.values) {
			TypeBinding type = exp.resolvedType;
			if (type == TypeBinding.NULL)
				signature.append(ConstantPool.JavaLangObjectSignature);
			else
				signature.append(type.signature());
		}
		signature.append(")Ljava/lang/StringTemplate;"); //$NON-NLS-1$
		codeStream.invokeDynamic(index,
				1, //
				1, // int
				ConstantPool.PROCESS,
				signature.toString().toCharArray(),
				TypeIds.T_int,
				TypeBinding.INT);
	}
	@Override
	public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
		for (Expression exp : this.values) {
			flowInfo = exp.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
		}
		return flowInfo;
	}
	@Override
	public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
		for (Expression exp : this.values) {
			exp.generateCode(currentScope, codeStream, valueRequired);
		}

		generateNewTemplateBootstrap(codeStream);
		int pc = codeStream.position;
		codeStream.recordPositionsFrom(pc, this.sourceStart);
	}
	@Override
	public StringBuilder printExpression(int indent, StringBuilder output) {
		int length = this.fragments.length;
		output.append('\"');
		if (this.isMultiline)
			output.append("\"\"\n"); //$NON-NLS-1$
		for (int i = 0; i < length; i++) {
			char[] source = this.fragments[i].source();
			for (int j = 0; j < source.length; j++) {
				Util.appendEscapedChar(output, source[j], true);
			}
			if (i + 1 < length) {
				output.append("\\{"); //$NON-NLS-1$
				if (this.values[i] != null) {
					this.values[i].printExpression(0, output);
				}
				output.append("}"); //$NON-NLS-1$
			}
		}
		output.append('\"');
		if (this.isMultiline)
			output.append("\"\""); //$NON-NLS-1$
		return output;
	}
}