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With inspiration from other libraries
/*
* 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.Tool;
import org.antlr.v4.codegen.CodeGenerator;
import org.antlr.v4.codegen.Target;
import org.antlr.v4.codegen.UnicodeEscapes;
import org.antlr.v4.tool.ast.GrammarAST;
import org.stringtemplate.v4.STGroup;
import org.stringtemplate.v4.StringRenderer;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
public class JavaTarget extends Target {
/**
* The Java target can cache the code generation templates.
*/
private static final ThreadLocal targetTemplates = new ThreadLocal();
protected static final String[] javaKeywords = {
"abstract", "assert", "boolean", "break", "byte", "case", "catch",
"char", "class", "const", "continue", "default", "do", "double", "else",
"enum", "extends", "false", "final", "finally", "float", "for", "goto",
"if", "implements", "import", "instanceof", "int", "interface",
"long", "native", "new", "null", "package", "private", "protected",
"public", "return", "short", "static", "strictfp", "super", "switch",
"synchronized", "this", "throw", "throws", "transient", "true", "try",
"void", "volatile", "while"
};
/** Avoid grammar symbols in this set to prevent conflicts in gen'd code. */
protected final Set badWords = new HashSet();
public JavaTarget(CodeGenerator gen) {
super(gen, "Java");
}
@Override
public String getVersion() {
return Tool.VERSION; // Java and tool versions move in lock step
}
public Set getBadWords() {
if (badWords.isEmpty()) {
addBadWords();
}
return badWords;
}
protected void addBadWords() {
badWords.addAll(Arrays.asList(javaKeywords));
badWords.add("rule");
badWords.add("parserRule");
}
@Override
public int getSerializedATNSegmentLimit() {
// 65535 is the class file format byte limit for a UTF-8 encoded string literal
// 3 is the maximum number of bytes it takes to encode a value in the range 0-0xFFFF
return 65535 / 3;
}
@Override
protected boolean visibleGrammarSymbolCausesIssueInGeneratedCode(GrammarAST idNode) {
return getBadWords().contains(idNode.getText());
}
@Override
protected STGroup loadTemplates() {
STGroup result = targetTemplates.get();
if (result == null) {
result = super.loadTemplates();
result.registerRenderer(String.class, new JavaStringRenderer(), true);
targetTemplates.set(result);
}
return result;
}
protected static class JavaStringRenderer extends StringRenderer {
@Override
public String toString(Object o, String formatString, Locale locale) {
if ("java-escape".equals(formatString)) {
// 5C is the hex code for the \ itself
return ((String)o).replace("\\u", "\\u005Cu");
}
return super.toString(o, formatString, locale);
}
}
@Override
protected void appendUnicodeEscapedCodePoint(int codePoint, StringBuilder sb) {
UnicodeEscapes.appendJavaStyleEscapedCodePoint(codePoint, sb);
}
}
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