org.antlr.v4.codegen.target.Python3Target Maven / Gradle / Ivy
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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.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;
/**
*
* @author Eric Vergnaud
*/
public class Python3Target extends Target {
protected static final String[] python3Keywords = {
"abs", "all", "and", "any", "apply", "as", "assert",
"bin", "bool", "break", "buffer", "bytearray",
"callable", "chr", "class", "classmethod", "coerce", "compile", "complex", "continue",
"def", "del", "delattr", "dict", "dir", "divmod",
"elif", "else", "enumerate", "eval", "execfile", "except",
"file", "filter", "finally", "float", "for", "format", "from", "frozenset",
"getattr", "global", "globals",
"hasattr", "hash", "help", "hex",
"id", "if", "import", "in", "input", "int", "intern", "is", "isinstance", "issubclass", "iter",
"lambda", "len", "list", "locals",
"map", "max", "min", "memoryview",
"next", "nonlocal", "not",
"object", "oct", "open", "or", "ord",
"pass", "pow", "print", "property",
"raise", "range", "raw_input", "reduce", "reload", "repr", "return", "reversed", "round",
"set", "setattr", "slice", "sorted", "staticmethod", "str", "sum", "super",
"try", "tuple", "type",
"unichr", "unicode",
"vars",
"with", "while",
"yield",
"zip",
"__import__",
"True", "False", "None"
};
public Python3Target(CodeGenerator gen) {
super(gen, "Python3");
}
@Override
public int getSerializedATNSegmentLimit() {
// set to something stupid to avoid segmentation
return Integer.MAX_VALUE;
}
@Override
protected boolean visibleGrammarSymbolCausesIssueInGeneratedCode(GrammarAST idNode) {
return getBadWords().contains(idNode.getText());
}
@Override
protected STGroup loadTemplates() {
STGroup result = super.loadTemplates();
result.registerRenderer(String.class, new PythonStringRenderer(), true);
return result;
}
protected static class PythonStringRenderer extends StringRenderer {
@Override
public String toString(Object o, String formatString, Locale locale) {
return super.toString(o, formatString, locale);
}
}
@Override
public boolean wantsBaseListener() {
return false;
}
@Override
public boolean wantsBaseVisitor() {
return false;
}
@Override
public boolean supportsOverloadedMethods() {
return false;
}
@Override
public String getVersion() {
return "4.7.2";
}
/** Avoid grammar symbols in this set to prevent conflicts in gen'd code. */
protected final Set badWords = new HashSet();
public Set getBadWords() {
if (badWords.isEmpty()) {
addBadWords();
}
return badWords;
}
protected void addBadWords() {
badWords.addAll(Arrays.asList(python3Keywords));
badWords.add("rule");
badWords.add("parserRule");
}
@Override
protected void appendUnicodeEscapedCodePoint(int codePoint, StringBuilder sb) {
UnicodeEscapes.appendPythonStyleEscapedCodePoint(codePoint, sb);
}
}