// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.common.options;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* Some convenient converters used by blaze. Note: These are specific to
* blaze.
*/
public final class Converters {
/** Standard converter for booleans. Accepts common shorthands/synonyms. */
public static class BooleanConverter implements Converter<Boolean> {
@Override
public Boolean convert(String input) throws OptionsParsingException {
if (input == null) {
return false;
}
input = input.toLowerCase();
if (input.equals("true")
|| input.equals("1")
|| input.equals("yes")
|| input.equals("t")
|| input.equals("y")) {
return true;
}
if (input.equals("false")
|| input.equals("0")
|| input.equals("no")
|| input.equals("f")
|| input.equals("n")) {
return false;
}
throw new OptionsParsingException("'" + input + "' is not a boolean");
}
@Override
public String getTypeDescription() {
return "a boolean";
}
}
/** Standard converter for Strings. */
public static class StringConverter implements Converter<String> {
@Override
public String convert(String input) {
return input;
}
@Override
public String getTypeDescription() {
return "a string";
}
}
/** Standard converter for integers. */
public static class IntegerConverter implements Converter<Integer> {
@Override
public Integer convert(String input) throws OptionsParsingException {
try {
return Integer.decode(input);
} catch (NumberFormatException e) {
throw new OptionsParsingException("'" + input + "' is not an int");
}
}
@Override
public String getTypeDescription() {
return "an integer";
}
}
/** Standard converter for longs. */
public static class LongConverter implements Converter<Long> {
@Override
public Long convert(String input) throws OptionsParsingException {
try {
return Long.decode(input);
} catch (NumberFormatException e) {
throw new OptionsParsingException("'" + input + "' is not a long");
}
}
@Override
public String getTypeDescription() {
return "a long integer";
}
}
/** Standard converter for doubles. */
public static class DoubleConverter implements Converter<Double> {
@Override
public Double convert(String input) throws OptionsParsingException {
try {
return Double.parseDouble(input);
} catch (NumberFormatException e) {
throw new OptionsParsingException("'" + input + "' is not a double");
}
}
@Override
public String getTypeDescription() {
return "a double";
}
}
/** Standard converter for TriState values. */
public static class TriStateConverter implements Converter<TriState> {
@Override
public TriState convert(String input) throws OptionsParsingException {
if (input == null) {
return TriState.AUTO;
}
input = input.toLowerCase();
if (input.equals("auto")) {
return TriState.AUTO;
}
if (input.equals("true")
|| input.equals("1")
|| input.equals("yes")
|| input.equals("t")
|| input.equals("y")) {
return TriState.YES;
}
if (input.equals("false")
|| input.equals("0")
|| input.equals("no")
|| input.equals("f")
|| input.equals("n")) {
return TriState.NO;
}
throw new OptionsParsingException("'" + input + "' is not a boolean");
}
@Override
public String getTypeDescription() {
return "a tri-state (auto, yes, no)";
}
}
/**
* Standard "converter" for Void. Should not actually be invoked. For instance, expansion flags
* are usually Void-typed and do not invoke the converter.
*/
public static class VoidConverter implements Converter<Void> {
@Override
public Void convert(String input) throws OptionsParsingException {
if (input == null) {
return null; // expected input, return is unused so null is fine.
}
throw new OptionsParsingException("'" + input + "' unexpected");
}
@Override
public String getTypeDescription() {
return "";
}
}
/**
* The converters that are available to the options parser by default. These are used if the
* {@code @Option} annotation does not specify its own {@code converter}, and its type is one of
* the following.
*/
static final Map<Class<?>, Converter<?>> DEFAULT_CONVERTERS = Maps.newHashMap();
static {
DEFAULT_CONVERTERS.put(String.class, new Converters.StringConverter());
DEFAULT_CONVERTERS.put(int.class, new Converters.IntegerConverter());
DEFAULT_CONVERTERS.put(long.class, new Converters.LongConverter());
DEFAULT_CONVERTERS.put(double.class, new Converters.DoubleConverter());
DEFAULT_CONVERTERS.put(boolean.class, new Converters.BooleanConverter());
DEFAULT_CONVERTERS.put(TriState.class, new Converters.TriStateConverter());
DEFAULT_CONVERTERS.put(Void.class, new Converters.VoidConverter());
}
/**
* Join a list of words as in English. Examples:
* "nothing"
* "one"
* "one or two"
* "one and two"
* "one, two or three".
* "one, two and three".
* The toString method of each element is used.
*/
static String joinEnglishList(Iterable<?> choices) {
StringBuilder buf = new StringBuilder();
for (Iterator<?> ii = choices.iterator(); ii.hasNext(); ) {
Object choice = ii.next();
if (buf.length() > 0) {
buf.append(ii.hasNext() ? ", " : " or ");
}
buf.append(choice);
}
return buf.length() == 0 ? "nothing" : buf.toString();
}
public static class SeparatedOptionListConverter
implements Converter<List<String>> {
private final String separatorDescription;
private final Splitter splitter;
protected SeparatedOptionListConverter(char separator,
String separatorDescription) {
this.separatorDescription = separatorDescription;
this.splitter = Splitter.on(separator);
}
@Override
public List<String> convert(String input) {
return input.equals("")
? ImmutableList.<String>of()
: ImmutableList.copyOf(splitter.split(input));
}
@Override
public String getTypeDescription() {
return separatorDescription + "-separated list of options";
}
}
public static class CommaSeparatedOptionListConverter
extends SeparatedOptionListConverter {
public CommaSeparatedOptionListConverter() {
super(',', "comma");
}
}
public static class ColonSeparatedOptionListConverter extends SeparatedOptionListConverter {
public ColonSeparatedOptionListConverter() {
super(':', "colon");
}
}
public static class LogLevelConverter implements Converter<Level> {
public static final Level[] LEVELS = new Level[] {
Level.OFF, Level.SEVERE, Level.WARNING, Level.INFO, Level.FINE,
Level.FINER, Level.FINEST
};
@Override
public Level convert(String input) throws OptionsParsingException {
try {
int level = Integer.parseInt(input);
return LEVELS[level];
} catch (NumberFormatException e) {
throw new OptionsParsingException("Not a log level: " + input);
} catch (ArrayIndexOutOfBoundsException e) {
throw new OptionsParsingException("Not a log level: " + input);
}
}
@Override
public String getTypeDescription() {
return "0 <= an integer <= " + (LEVELS.length - 1);
}
}
/**
* Checks whether a string is part of a set of strings.
*/
public static class StringSetConverter implements Converter<String> {
// TODO(bazel-team): if this class never actually contains duplicates, we could s/List/Set/
// here.
private final List<String> values;
public StringSetConverter(String... values) {
this.values = ImmutableList.copyOf(values);
}
@Override
public String convert(String input) throws OptionsParsingException {
if (values.contains(input)) {
return input;
}
throw new OptionsParsingException("Not one of " + values);
}
@Override
public String getTypeDescription() {
return joinEnglishList(values);
}
}
/**
* Checks whether a string is a valid regex pattern and compiles it.
*/
public static class RegexPatternConverter implements Converter<Pattern> {
@Override
public Pattern convert(String input) throws OptionsParsingException {
try {
return Pattern.compile(input);
} catch (PatternSyntaxException e) {
throw new OptionsParsingException("Not a valid regular expression: " + e.getMessage());
}
}
@Override
public String getTypeDescription() {
return "a valid Java regular expression";
}
}
/**
* Limits the length of a string argument.
*/
public static class LengthLimitingConverter implements Converter<String> {
private final int maxSize;
public LengthLimitingConverter(int maxSize) {
this.maxSize = maxSize;
}
@Override
public String convert(String input) throws OptionsParsingException {
if (input.length() > maxSize) {
throw new OptionsParsingException("Input must be " + getTypeDescription());
}
return input;
}
@Override
public String getTypeDescription() {
return "a string <= " + maxSize + " characters";
}
}
/**
* Checks whether an integer is in the given range.
*/
public static class RangeConverter implements Converter<Integer> {
final int minValue;
final int maxValue;
public RangeConverter(int minValue, int maxValue) {
this.minValue = minValue;
this.maxValue = maxValue;
}
@Override
public Integer convert(String input) throws OptionsParsingException {
try {
Integer value = Integer.parseInt(input);
if (value < minValue) {
throw new OptionsParsingException("'" + input + "' should be >= " + minValue);
} else if (value < minValue || value > maxValue) {
throw new OptionsParsingException("'" + input + "' should be <= " + maxValue);
}
return value;
} catch (NumberFormatException e) {
throw new OptionsParsingException("'" + input + "' is not an int");
}
}
@Override
public String getTypeDescription() {
if (minValue == Integer.MIN_VALUE) {
if (maxValue == Integer.MAX_VALUE) {
return "an integer";
} else {
return "an integer, <= " + maxValue;
}
} else if (maxValue == Integer.MAX_VALUE) {
return "an integer, >= " + minValue;
} else {
return "an integer in "
+ (minValue < 0 ? "(" + minValue + ")" : minValue) + "-" + maxValue + " range";
}
}
}
/**
* A converter for variable assignments from the parameter list of a blaze
* command invocation. Assignments are expected to have the form "name=value",
* where names and values are defined to be as permissive as possible.
*/
public static class AssignmentConverter implements Converter<Map.Entry<String, String>> {
@Override
public Map.Entry<String, String> convert(String input)
throws OptionsParsingException {
int pos = input.indexOf("=");
if (pos <= 0) {
throw new OptionsParsingException("Variable definitions must be in the form of a "
+ "'name=value' assignment");
}
String name = input.substring(0, pos);
String value = input.substring(pos + 1);
return Maps.immutableEntry(name, value);
}
@Override
public String getTypeDescription() {
return "a 'name=value' assignment";
}
}
/**
* A converter for variable assignments from the parameter list of a blaze
* command invocation. Assignments are expected to have the form "name[=value]",
* where names and values are defined to be as permissive as possible and value
* part can be optional (in which case it is considered to be null).
*/
public static class OptionalAssignmentConverter implements Converter<Map.Entry<String, String>> {
@Override
public Map.Entry<String, String> convert(String input)
throws OptionsParsingException {
int pos = input.indexOf("=");
if (pos == 0 || input.length() == 0) {
throw new OptionsParsingException("Variable definitions must be in the form of a "
+ "'name=value' or 'name' assignment");
} else if (pos < 0) {
return Maps.immutableEntry(input, null);
}
String name = input.substring(0, pos);
String value = input.substring(pos + 1);
return Maps.immutableEntry(name, value);
}
@Override
public String getTypeDescription() {
return "a 'name=value' assignment with an optional value part";
}
}
public static class HelpVerbosityConverter extends EnumConverter<OptionsParser.HelpVerbosity> {
public HelpVerbosityConverter() {
super(OptionsParser.HelpVerbosity.class, "--help_verbosity setting");
}
}
}