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The ANTLR 4 grammar compiler.
There is a newer version: 4.13.2
/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
package org.antlr.v4.codegen.target;

import org.antlr.v4.codegen.CodeGenerator;
import org.antlr.v4.codegen.Target;
import org.antlr.v4.codegen.UnicodeEscapes;
import org.antlr.v4.tool.ErrorType;
import org.antlr.v4.tool.ast.GrammarAST;
import org.stringtemplate.v4.NumberRenderer;
import org.stringtemplate.v4.STErrorListener;
import org.stringtemplate.v4.STGroup;
import org.stringtemplate.v4.STGroupFile;
import org.stringtemplate.v4.StringRenderer;
import org.stringtemplate.v4.misc.STMessage;

public class CSharpTarget extends Target {

	public CSharpTarget(CodeGenerator gen) {
		super(gen, "CSharp");
		targetCharValueEscape[0] = "\\0";
		targetCharValueEscape[0x0007] = "\\a";
		targetCharValueEscape[0x000B] = "\\v";
	}

    @Override
    public String getVersion() {
        return "4.8";
    }

	@Override
	public String encodeIntAsCharEscape(int v) {
		if (v < Character.MIN_VALUE || v > Character.MAX_VALUE) {
			throw new IllegalArgumentException(String.format("Cannot encode the specified value: %d", v));
		}

		String formatted;
		if (v >= 0 && v < targetCharValueEscape.length && targetCharValueEscape[v] != null) {
			formatted = targetCharValueEscape[v];
		}
		else if (v >= 0x20 && v < 127 && (v < '0' || v > '9') && (v < 'a' || v > 'f') && (v < 'A' || v > 'F')) {
			formatted = Character.toString((char)v);
		}
		else {
			formatted = String.format("\\x%X", v & 0xFFFF);
		}

		return "'" + formatted + "'";
	}

	@Override
	protected boolean visibleGrammarSymbolCausesIssueInGeneratedCode(GrammarAST idNode) {
		return false;
	}

	@Override
	protected STGroup loadTemplates() {
		// override the superclass behavior to put all C# templates in the same folder
		STGroup result = new STGroupFile(CodeGenerator.TEMPLATE_ROOT+"/CSharp/"+getLanguage()+STGroup.GROUP_FILE_EXTENSION);
		result.registerRenderer(Integer.class, new NumberRenderer());
		result.registerRenderer(String.class, new StringRenderer());
		result.setListener(new STErrorListener() {
			@Override
			public void compileTimeError(STMessage msg) {
				reportError(msg);
			}

			@Override
			public void runTimeError(STMessage msg) {
				reportError(msg);
			}

			@Override
			public void IOError(STMessage msg) {
				reportError(msg);
			}

			@Override
			public void internalError(STMessage msg) {
				reportError(msg);
			}

			private void reportError(STMessage msg) {
				getCodeGenerator().tool.errMgr.toolError(ErrorType.STRING_TEMPLATE_WARNING, msg.cause, msg.toString());
			}
		});

		return result;
	}

	@Override
	protected void appendUnicodeEscapedCodePoint(int codePoint, StringBuilder sb) {
		// C# and Python share the same escaping style.
		UnicodeEscapes.appendPythonStyleEscapedCodePoint(codePoint, sb);
	}
}