org.antlr.v4.tool.ErrorManager Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of antlr4 Show documentation
Show all versions of antlr4 Show documentation
The ANTLR 4 grammar compiler.
/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.tool;
import org.antlr.v4.Tool;
import org.stringtemplate.v4.ST;
import org.stringtemplate.v4.STErrorListener;
import org.stringtemplate.v4.STGroup;
import org.stringtemplate.v4.STGroupFile;
import org.stringtemplate.v4.misc.ErrorBuffer;
import org.stringtemplate.v4.misc.STMessage;
import java.net.URL;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Locale;
import java.util.Set;
public class ErrorManager {
public static final String FORMATS_DIR = "org/antlr/v4/tool/templates/messages/formats/";
public Tool tool;
public int errors;
public int warnings;
/** All errors that have been generated */
public Set errorTypes = EnumSet.noneOf(ErrorType.class);
/** The group of templates that represent the current message format. */
STGroup format;
/** Messages should be sensitive to the locale. */
Locale locale;
String formatName;
ErrorBuffer initSTListener = new ErrorBuffer();
STErrorListener theDefaultSTListener =
new STErrorListener() {
@Override
public void compileTimeError(STMessage msg) {
ErrorManager.internalError(msg.toString());
}
@Override
public void runTimeError(STMessage msg) {
ErrorManager.internalError(msg.toString());
}
@Override
public void IOError(STMessage msg) {
ErrorManager.internalError(msg.toString());
}
@Override
public void internalError(STMessage msg) {
ErrorManager.internalError(msg.toString());
}
};
public ErrorManager(Tool tool) {
this.tool = tool;
}
public void resetErrorState() {
errors = 0;
warnings = 0;
}
public ST getMessageTemplate(ANTLRMessage msg) {
ST messageST = msg.getMessageTemplate(tool.longMessages);
ST locationST = getLocationFormat();
ST reportST = getReportFormat(msg.getErrorType().severity);
ST messageFormatST = getMessageFormat();
boolean locationValid = false;
if (msg.line != -1) {
locationST.add("line", msg.line);
locationValid = true;
}
if (msg.charPosition != -1) {
locationST.add("column", msg.charPosition);
locationValid = true;
}
if (msg.fileName != null) {
locationST.add("file", msg.fileName);
locationValid = true;
}
messageFormatST.add("id", msg.getErrorType().code);
messageFormatST.add("text", messageST);
if (locationValid) reportST.add("location", locationST);
reportST.add("message", messageFormatST);
//((DebugST)reportST).inspect();
// reportST.impl.dump();
return reportST;
}
/** Return a StringTemplate that refers to the current format used for
* emitting messages.
*/
public ST getLocationFormat() {
return format.getInstanceOf("location");
}
public ST getReportFormat(ErrorSeverity severity) {
ST st = format.getInstanceOf("report");
st.add("type", severity.getText());
return st;
}
public ST getMessageFormat() {
return format.getInstanceOf("message");
}
public boolean formatWantsSingleLineMessage() {
return format.getInstanceOf("wantsSingleLineMessage").render().equals("true");
}
public void info(String msg) { tool.info(msg); }
public void syntaxError(ErrorType etype,
String fileName,
org.antlr.runtime.Token token,
org.antlr.runtime.RecognitionException antlrException,
Object... args)
{
ANTLRMessage msg = new GrammarSyntaxMessage(etype,fileName,token,antlrException,args);
emit(etype, msg);
}
public static void fatalInternalError(String error, Throwable e) {
internalError(error, e);
throw new RuntimeException(error, e);
}
public static void internalError(String error, Throwable e) {
StackTraceElement location = getLastNonErrorManagerCodeLocation(e);
internalError("Exception "+e+"@"+location+": "+error);
}
public static void internalError(String error) {
StackTraceElement location =
getLastNonErrorManagerCodeLocation(new Exception());
String msg = location+": "+error;
System.err.println("internal error: "+msg);
}
/**
* Raise a predefined message with some number of paramters for the StringTemplate but for which there
* is no location information possible.
* @param errorType The Message Descriptor
* @param args The arguments to pass to the StringTemplate
*/
public void toolError(ErrorType errorType, Object... args) {
ToolMessage msg = new ToolMessage(errorType, args);
emit(errorType, msg);
}
public void toolError(ErrorType errorType, Throwable e, Object... args) {
ToolMessage msg = new ToolMessage(errorType, e, args);
emit(errorType, msg);
}
public void grammarError(ErrorType etype,
String fileName,
org.antlr.runtime.Token token,
Object... args)
{
ANTLRMessage msg = new GrammarSemanticsMessage(etype,fileName,token,args);
emit(etype, msg);
}
public void leftRecursionCycles(String fileName, Collection> cycles) {
errors++;
ANTLRMessage msg = new LeftRecursionCyclesMessage(fileName, cycles);
tool.error(msg);
}
public int getNumErrors() {
return errors;
}
/** Return first non ErrorManager code location for generating messages */
private static StackTraceElement getLastNonErrorManagerCodeLocation(Throwable e) {
StackTraceElement[] stack = e.getStackTrace();
int i = 0;
for (; i < stack.length; i++) {
StackTraceElement t = stack[i];
if (!t.toString().contains("ErrorManager")) {
break;
}
}
StackTraceElement location = stack[i];
return location;
}
// S U P P O R T C O D E
@SuppressWarnings("fallthrough")
public void emit(ErrorType etype, ANTLRMessage msg) {
switch ( etype.severity ) {
case WARNING_ONE_OFF:
if ( errorTypes.contains(etype) ) break;
// fall thru
case WARNING:
warnings++;
tool.warning(msg);
break;
case ERROR_ONE_OFF:
if ( errorTypes.contains(etype) ) break;
// fall thru
case ERROR:
errors++;
tool.error(msg);
break;
}
errorTypes.add(etype);
}
/** The format gets reset either from the Tool if the user supplied a command line option to that effect
* Otherwise we just use the default "antlr".
*/
public void setFormat(String formatName) {
this.formatName = formatName;
String fileName = FORMATS_DIR +formatName+STGroup.GROUP_FILE_EXTENSION;
ClassLoader cl = Thread.currentThread().getContextClassLoader();
URL url = cl.getResource(fileName);
if ( url==null ) {
cl = ErrorManager.class.getClassLoader();
url = cl.getResource(fileName);
}
if ( url==null && formatName.equals("antlr") ) {
rawError("ANTLR installation corrupted; cannot find ANTLR messages format file "+fileName);
panic();
}
else if ( url==null ) {
rawError("no such message format file "+fileName+" retrying with default ANTLR format");
setFormat("antlr"); // recurse on this rule, trying the default message format
return;
}
format = new STGroupFile(fileName, "UTF-8");
format.load();
if ( !initSTListener.errors.isEmpty() ) {
rawError("ANTLR installation corrupted; can't load messages format file:\n"+
initSTListener.toString());
panic();
}
boolean formatOK = verifyFormat();
if ( !formatOK && formatName.equals("antlr") ) {
rawError("ANTLR installation corrupted; ANTLR messages format file "+formatName+".stg incomplete");
panic();
}
else if ( !formatOK ) {
setFormat("antlr"); // recurse on this rule, trying the default message format
}
}
/** Verify the message format template group */
protected boolean verifyFormat() {
boolean ok = true;
if (!format.isDefined("location")) {
System.err.println("Format template 'location' not found in " + formatName);
ok = false;
}
if (!format.isDefined("message")) {
System.err.println("Format template 'message' not found in " + formatName);
ok = false;
}
if (!format.isDefined("report")) {
System.err.println("Format template 'report' not found in " + formatName);
ok = false;
}
return ok;
}
/** If there are errors during ErrorManager init, we have no choice
* but to go to System.err.
*/
static void rawError(String msg) {
System.err.println(msg);
}
static void rawError(String msg, Throwable e) {
rawError(msg);
e.printStackTrace(System.err);
}
public static void panic(String msg) {
rawError(msg);
panic();
}
public static void panic() {
// can't call tool.panic since there may be multiple tools; just
// one error manager
throw new Error("ANTLR ErrorManager panic");
}
}