forked from jasder/antlr
Add GoTarget
This commit is contained in:
Peter Boyer
parent
acbce59a89
commit
9f9cd374b4
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/*
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* [The "BSD license"]
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* Copyright (c) 2012 Terence Parr
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* Copyright (c) 2012 Sam Harwell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.antlr.v4.codegen.target;
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import org.antlr.v4.codegen.CodeGenerator;
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import org.antlr.v4.codegen.Target;
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import org.antlr.v4.tool.ast.GrammarAST;
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import org.stringtemplate.v4.STGroup;
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import org.stringtemplate.v4.StringRenderer;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Locale;
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import java.util.Set;
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/**
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*
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* @author Peter Boyer
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*
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* */
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public class GoTarget extends Target {
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/** Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar */
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protected static final String[] goKeywords = {
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"break","default","func","interface","select",
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"case","defer","go","map","struct",
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"chan","else","goto","package","switch",
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"const","fallthrough","if","range","type",
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"continue","for","import","return","var"
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};
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/** Avoid grammar symbols in this set to prevent conflicts in gen'd code. */
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protected final Set<String> badWords = new HashSet<String>();
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public GoTarget(CodeGenerator gen) {
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super(gen, "Go");
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}
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@Override
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public String getVersion() {
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return "4.5.1";
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}
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public Set<String> getBadWords() {
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if (badWords.isEmpty()) {
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addBadWords();
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}
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return badWords;
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}
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protected void addBadWords() {
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badWords.addAll(Arrays.asList(goKeywords));
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badWords.add("rule");
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badWords.add("parserRule");
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}
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/**
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* {@inheritDoc}
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* <p/>
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* For Java, this is the translation {@code 'a\n"'} → {@code "a\n\""}.
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* Expect single quotes around the incoming literal. Just flip the quotes
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* and replace double quotes with {@code \"}.
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* <p/>
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* Note that we have decided to allow people to use '\"' without penalty, so
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* we must build the target string in a loop as {@link String#replace}
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* cannot handle both {@code \"} and {@code "} without a lot of messing
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* around.
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*/
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@Override
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public String getTargetStringLiteralFromANTLRStringLiteral(
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CodeGenerator generator,
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String literal, boolean addQuotes)
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{
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StringBuilder sb = new StringBuilder();
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String is = literal;
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if ( addQuotes ) sb.append('"');
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for (int i = 1; i < is.length() -1; i++) {
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if (is.charAt(i) == '\\') {
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// Anything escaped is what it is! We assume that
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// people know how to escape characters correctly. However
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// we catch anything that does not need an escape in Java (which
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// is what the default implementation is dealing with and remove
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// the escape. The C target does this for instance.
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//
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switch (is.charAt(i+1)) {
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// Pass through any escapes that Java also needs
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//
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case '"':
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case 'n':
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case 'r':
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case 't':
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case 'b':
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case 'f':
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case '\\':
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// Pass the escape through
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sb.append('\\');
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break;
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case 'u': // Assume unnnn
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// Pass the escape through as double \\
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// so that Java leaves as \u0000 string not char
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sb.append('\\');
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sb.append('\\');
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break;
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default:
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// Remove the escape by virtue of not adding it here
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// Thus \' becomes ' and so on
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break;
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}
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// Go past the \ character
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i++;
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} else {
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// Characters that don't need \ in ANTLR 'strings' but do in Java
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if (is.charAt(i) == '"') {
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// We need to escape " in Java
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sb.append('\\');
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}
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}
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// Add in the next character, which may have been escaped
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sb.append(is.charAt(i));
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}
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if ( addQuotes ) sb.append('"');
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return sb.toString();
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}
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@Override
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public String encodeIntAsCharEscape(int v) {
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if (v < Character.MIN_VALUE || v > Character.MAX_VALUE) {
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throw new IllegalArgumentException(String.format("Cannot encode the specified value: %d", v));
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}
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if (v >= 0 && v < targetCharValueEscape.length && targetCharValueEscape[v] != null) {
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return targetCharValueEscape[v];
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}
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if (v >= 0x20 && v < 127) {
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return String.valueOf((char)v);
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}
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String hex = Integer.toHexString(v|0x10000).substring(1,5);
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return "\\u"+hex;
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}
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@Override
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public int getSerializedATNSegmentLimit() {
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return 2 ^ 31;
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}
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@Override
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public int getInlineTestSetWordSize() {
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return 32;
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}
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@Override
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protected boolean visibleGrammarSymbolCausesIssueInGeneratedCode(GrammarAST idNode) {
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return getBadWords().contains(idNode.getText());
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}
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@Override
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protected STGroup loadTemplates() {
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STGroup result = super.loadTemplates();
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result.registerRenderer(String.class, new JavaStringRenderer(), true);
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return result;
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}
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protected static class JavaStringRenderer extends StringRenderer {
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@Override
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public String toString(Object o, String formatString, Locale locale) {
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if ("java-escape".equals(formatString)) {
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// 5C is the hex code for the \ itself
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return ((String)o).replace("\\u", "\\u005Cu");
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}
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return super.toString(o, formatString, locale);
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}
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}
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public boolean wantsBaseListener() {
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return false;
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}
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public boolean wantsBaseVisitor() {
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return false;
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}
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public boolean supportsOverloadedMethods() {
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return false;
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}
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}
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