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com.github.jknack.handlebars.helper.StringHelpers Maven / Gradle / Ivy
/**
* Copyright (c) 2012-2015 Edgar Espina
*
* This file is part of Handlebars.java.
*
* 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.github.jknack.handlebars.helper;
import static org.apache.commons.lang3.Validate.isTrue;
import static org.apache.commons.lang3.Validate.notNull;
import static org.apache.commons.lang3.Validate.validIndex;
import java.io.IOException;
import java.math.RoundingMode;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.LocaleUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.text.WordUtils;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Helper;
import com.github.jknack.handlebars.Options;
/**
* Commons string function helpers.
*
* @author edgar.espina
* @since 0.2.2
*/
public enum StringHelpers implements Helper {
/**
* Capitalizes the first character of the value.
* For example:
*
*
* {{capitalizeFirst value}}
*
*
* If value is "handlebars.java", the output will be "Handlebars.java".
*/
capitalizeFirst {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
return StringUtils.capitalize(value.toString());
}
},
/**
* Centers the value in a field of a given width.
* For example:
*
*
* {{center value size=19 [pad="char"] }}
*
*
* If value is "Handlebars.java", the output will be " Handlebars.java ".
*/
center {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Integer size = options.hash("size");
notNull(size, "found 'null', expected 'size'");
String pad = options.hash("pad", " ");
return StringUtils.center(value.toString(), size, pad);
}
},
/**
* Removes all values of arg from the given string.
* For example:
*
*
* {{cut value [" "]}}
*
*
* If value is "String with spaces", the output will be "Stringwithspaces".
*/
cut {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
String strip = options.param(0, " ");
return value.toString().replace(strip, "");
}
},
/**
* If value evaluates to False, uses the given default. Otherwise, uses the
* value.
* For example:
*
*
* {{defaultIfEmpty value ["nothing"] }}
* If value is "" (the empty string), the output will be nothing.
*
*/
defaultIfEmpty {
@Override
public Object apply(final Object value, final Options options)
throws IOException {
if (Handlebars.Utils.isEmpty(value)) {
return options.param(0, "");
}
return String.valueOf(value);
}
@Override
protected CharSequence safeApply(final Object context, final Options options) {
// Ignored
return null;
}
},
/**
* Joins an array, iterator or an iterable with a string.
* For example:
*
*
* {{join value " // " [prefix=""] [suffix=""]}}
*
*
*
* If value is the list ['a', 'b', 'c'], the output will be the string "a // b // c".
*
* Or:
*
*
* {{join "a" "b" "c" " // " [prefix=""] [suffix=""]}}
* Join the "a", "b", "c", the output will be the string "a // b // c".
*
*/
join {
@Override
public Object apply(final Object context, final Options options) {
if (options.isFalsy(context)) {
return "";
}
return safeApply(context, options);
}
@SuppressWarnings("rawtypes")
@Override
protected CharSequence safeApply(final Object context, final Options options) {
int separatorIdx = options.params.length - 1;
Object separator = options.param(separatorIdx, null);
notNull(separator, "found 'null', expected 'separator' at param[%s]", separatorIdx);
isTrue(separator instanceof String,
"found '%s', expected 'separator' at param[%s]", separator, separatorIdx);
String prefix = options.hash("prefix", "");
String suffix = options.hash("suffix", "");
if (context instanceof Iterable) {
return prefix + StringUtils.join((Iterable) context, (String) separator) + suffix;
}
if (context instanceof Iterator) {
return prefix + StringUtils.join((Iterator) context, (String) separator) + suffix;
}
if (context.getClass().isArray()) {
return prefix + StringUtils.join((Object[]) context, (String) separator) + suffix;
}
// join everything as single values
Object[] values = new Object[options.params.length];
System.arraycopy(options.params, 0, values, 1, separatorIdx);
values[0] = context;
return prefix + StringUtils.join(values, (String) separator) + suffix;
}
},
/**
* Left-aligns the value in a field of a given width.
* Argument: field size
* For example:
*
*
* {{ljust value 20 [pad=" "] }}
*
*
* If value is Handlebars.java, the output will be "Handlebars.java ".
*/
ljust {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Integer size = options.hash("size");
notNull(size, "found 'null', expected 'size'");
String pad = options.hash("pad", " ");
return StringUtils.rightPad(value.toString(), size, pad);
}
},
/**
* Right-aligns the value in a field of a given width.
* Argument: field size
* For example:
*
*
* {{rjust value 20 [pad=" "] }}
*
*
* If value is Handlebars.java, the output will be " Handlebars.java".
*/
rjust {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Integer size = options.hash("size");
notNull(size, "found 'null', expected 'size'");
String pad = options.hash("pad", " ");
return StringUtils.leftPad(value.toString(), size, pad);
}
},
/**
* Returns a new CharSequence that is a subsequence of this sequence.
* The subsequence starts with the char value at the specified index and
* ends with the char value at index end - 1
* Argument: start offset
* end offset
* For example:
*
*
* {{substring value 11 }}
*
*
* If value is Handlebars.java, the output will be "java".
*
* or
*
*
* {{substring value 0 10 }}
*
*
* If value is Handlebars.java, the output will be "Handlebars".
*/
substring {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
validIndex(options.params, 0, "Required start offset: ");
String str = value.toString();
Integer start = options.param(0);
Integer end = options.param(1, str.length());
return str.subSequence(start, end);
}
},
/**
* Converts a string into all lowercase.
* For example:
*
*
* {{lower value}}
*
*
* If value is 'Still MAD At Yoko', the output will be 'still mad at yoko'.
*/
lower {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
return value.toString().toLowerCase();
}
},
/**
* Converts a string into all uppercase.
* For example:
*
*
* {{upper value}}
*
*
* If value is 'Hello', the output will be 'HELLO'.
*/
upper {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
return value.toString().toUpperCase();
}
},
/**
* Converts to lowercase, removes non-word characters (alphanumerics and
* underscores) and converts spaces to hyphens. Also strips leading and
* trailing whitespace.
* For example:
*
*
* {{slugify value}}
*
*
* If value is "Joel is a slug", the output will be "joel-is-a-slug".
*/
slugify {
@Override
protected CharSequence safeApply(final Object context, final Options options) {
String value = StringUtils.strip(context.toString());
StringBuilder buffer = new StringBuilder(value.length());
for (int i = 0; i < value.length(); i++) {
char ch = value.charAt(i);
if (Character.isLetter(ch)) {
buffer.append(Character.toLowerCase(ch));
}
if (Character.isWhitespace(ch)) {
buffer.append('-');
}
}
return buffer.toString();
}
},
/**
* Formats the variable according to the argument, a string formatting
* specifier.
* For example:
*
*
* {{stringFormat string param0 param1 ... paramN}}
*
*
* If value is "Hello %s" "handlebars.java", the output will be
* "Hello handlebars.java".
*
* @see String#format(String, Object...)
*/
stringFormat {
@Override
protected CharSequence safeApply(final Object format, final Options options) {
return String.format(format.toString(), options.params);
}
},
/**
* Strips all [X]HTML tags.
* For example:
*
*
* {{stripTags value}}
*
*/
stripTags {
/**
* The HTML tag pattern.
*/
private final Pattern pattern = Pattern
.compile("\\<[^>]*>", Pattern.DOTALL);
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Matcher matcher = pattern.matcher(value.toString());
return matcher.replaceAll("");
}
},
/**
* Capitalizes all the whitespace separated words in a String.
* For example:
*
*
* {{ capitalize value [fully=false]}}
*
*
* If value is "my first post", the output will be "My First Post".
*/
capitalize {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Boolean fully = options.hash("fully", false);
return fully
? WordUtils.capitalizeFully(value.toString())
: WordUtils.capitalize(value.toString());
}
},
/**
* Truncates a string if it is longer than the specified number of characters.
* Truncated strings will end with a translatable ellipsis sequence ("...").
* Argument: Number of characters to truncate to
* For example:
*
*
* {{abbreviate value 13 }}
*
*
* If value is "Handlebars rocks", the output will be "Handlebars...".
*/
abbreviate {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Integer width = options.param(0, null);
notNull(width, "found 'null', expected 'width'");
return StringUtils.abbreviate(value.toString(), width);
}
},
/**
* Wraps words at specified line length.
* Argument: number of characters at which to wrap the text
* For example:
*
*
* {{ wordWrap value 5 }}
*
*
* If value is Joel is a slug, the output would be:
*
*
* Joel
* is a
* slug
*
*/
wordWrap {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
Integer length = options.param(0, null);
notNull(length, "found 'null', expected 'length'");
return WordUtils.wrap(value.toString(), length);
}
},
/**
* Replaces each substring of this string that matches the literal target
* sequence with the specified literal replacement sequence.
* For example:
*
*
* {{ replace value "..." "rocks" }}
*
*
* If value is "Handlebars ...", the output will be "Handlebars rocks".
*
*/
replace {
@Override
public CharSequence safeApply(final Object value, final Options options) {
String target = (String) options.param(0, null);
String replacement = (String) options.param(1, null);
return value.toString().replace(target, replacement);
}
},
/**
* Maps values for true, false and (optionally) null, to the strings "yes",
* "no", "maybe".
* For example:
*
*
* {{yesno value [yes="yes"] [no="no"] maybe=["maybe"] }}
*
*/
yesno {
@Override
public Object apply(final Object value, final Options options)
throws IOException {
if (value == null) {
return options.hash("maybe", "maybe");
}
isTrue(value instanceof Boolean, "found '%s', expected 'boolean'",
value);
if (Boolean.TRUE.equals(value)) {
return options.hash("yes", "yes");
}
return options.hash("no", "no");
}
@Override
protected CharSequence safeApply(final Object context, final Options options) {
return null;
}
},
/**
*
* Usage:
*
*
*
* {{dateFormat date ["format"] [format="format"][tz=timeZone|timeZoneId]}}
*
*
* Format parameters is one of:
*
* "full": full date format. For example: Tuesday, June 19, 2012
* "long": long date format. For example: June 19, 2012
* "medium": medium date format. For example: Jun 19, 2012
* "short": short date format. For example: 6/19/12
* "pattern": a date pattern.
*
* Otherwise, the default formatter will be used.
* The format option can be specified as a parameter or hash (a.k.a named parameter).
*/
dateFormat {
/**
* The default date styles.
*/
@SuppressWarnings("serial")
private Map styles = new HashMap()
{
{
put("full", DateFormat.FULL);
put("long", DateFormat.LONG);
put("medium", DateFormat.MEDIUM);
put("short", DateFormat.SHORT);
}
};
@Override
protected CharSequence safeApply(final Object value, final Options options) {
isTrue(value instanceof Date, "found '%s', expected 'date'", value);
Date date = (Date) value;
final DateFormat dateFormat;
Object pattern = options.param(0, options.hash("format", "medium"));
String localeStr = options.param(1, Locale.getDefault().toString());
Locale locale = LocaleUtils.toLocale(localeStr);
Integer style = styles.get(pattern);
if (style == null) {
dateFormat = new SimpleDateFormat(pattern.toString(), locale);
} else {
dateFormat = DateFormat.getDateInstance(style, locale);
}
Object tz = options.hash("tz");
if (tz != null) {
final TimeZone timeZone = tz instanceof TimeZone ? (TimeZone) tz : TimeZone.getTimeZone(tz
.toString());
dateFormat.setTimeZone(timeZone);
}
return dateFormat.format(date);
}
},
/**
*
* Usage:
*
*
*
* {{numberFormat number ["format"] [locale=default]}}
*
*
* Format parameters is one of:
*
* "integer": the integer number format
* "percent": the percent number format
* "currency": the decimal number format
* "pattern": a decimal pattern.
*
* Otherwise, the default formatter will be used.
*
*
* More options:
*
*
* groupingUsed: Set whether or not grouping will be used in this format.
* maximumFractionDigits: Sets the maximum number of digits allowed in the fraction portion of
* a number.
* maximumIntegerDigits: Sets the maximum number of digits allowed in the integer portion of a
* number
* minimumFractionDigits: Sets the minimum number of digits allowed in the fraction portion of
* a number
* minimumIntegerDigits: Sets the minimum number of digits allowed in the integer portion of a
* number.
* parseIntegerOnly: Sets whether or not numbers should be parsed as integers only.
* roundingMode: Sets the {@link java.math.RoundingMode} used in this NumberFormat.
*
*
* @see NumberFormat
* @see DecimalFormat
*/
numberFormat {
@Override
public Object apply(final Object context, final Options options) throws IOException {
if (context instanceof Number) {
return safeApply(context, options);
}
Object param = options.param(0, null);
return param == null ? null : param.toString();
}
@Override
protected CharSequence safeApply(final Object value, final Options options) {
isTrue(value instanceof Number, "found '%s', expected 'number'", value);
Number number = (Number) value;
final NumberFormat numberFormat = build(options);
Boolean groupingUsed = options.hash("groupingUsed");
if (groupingUsed != null) {
numberFormat.setGroupingUsed(groupingUsed);
}
Integer maximumFractionDigits = options.hash("maximumFractionDigits");
if (maximumFractionDigits != null) {
numberFormat.setMaximumFractionDigits(maximumFractionDigits);
}
Integer maximumIntegerDigits = options.hash("maximumIntegerDigits");
if (maximumIntegerDigits != null) {
numberFormat.setMaximumIntegerDigits(maximumIntegerDigits);
}
Integer minimumFractionDigits = options.hash("minimumFractionDigits");
if (minimumFractionDigits != null) {
numberFormat.setMinimumFractionDigits(minimumFractionDigits);
}
Integer minimumIntegerDigits = options.hash("minimumIntegerDigits");
if (minimumIntegerDigits != null) {
numberFormat.setMinimumIntegerDigits(minimumIntegerDigits);
}
Boolean parseIntegerOnly = options.hash("parseIntegerOnly");
if (parseIntegerOnly != null) {
numberFormat.setParseIntegerOnly(parseIntegerOnly);
}
String roundingMode = options.hash("roundingMode");
if (roundingMode != null) {
numberFormat.setRoundingMode(RoundingMode.valueOf(roundingMode.toUpperCase().trim()));
}
return numberFormat.format(number);
}
/**
* Build a number format from options.
*
* @param options The helper options.
* @return The number format to use.
*/
private NumberFormat build(final Options options) {
if (options.params.length == 0) {
return NumberStyle.DEFAULT.numberFormat(Locale.getDefault());
}
isTrue(options.params[0] instanceof String, "found '%s', expected 'string'",
options.params[0]);
String format = options.param(0);
String localeStr = options.param(1, Locale.getDefault().toString());
Locale locale = LocaleUtils.toLocale(localeStr);
try {
NumberStyle style = NumberStyle.valueOf(format.toUpperCase().trim());
return style.numberFormat(locale);
} catch (ArrayIndexOutOfBoundsException ex) {
return NumberStyle.DEFAULT.numberFormat(locale);
} catch (IllegalArgumentException ex) {
return new DecimalFormat(format, new DecimalFormatSymbols(locale));
}
}
},
/**
*
* Usage:
*
*
*
* {{now ["format"] [tz=timeZone|timeZoneId]}}
*
*
* Format parameters is one of:
*
* "full": full date format. For example: Tuesday, June 19, 2012
* "long": long date format. For example: June 19, 2012
* "medium": medium date format. For example: Jun 19, 2012
* "short": short date format. For example: 6/19/12
* "pattern": a date pattern.
*
* Otherwise, the default formatter will be used.
*/
now {
@Override
protected CharSequence safeApply(final Object value, final Options options) {
return StringHelpers.dateFormat.safeApply(new Date(), options);
}
};
@Override
public Object apply(final Object context, final Options options) throws IOException {
if (options.isFalsy(context)) {
Object param = options.param(0, null);
return param == null ? null : param.toString();
}
return safeApply(context, options);
}
/**
* Apply the helper to the context.
*
* @param context The context object (param=0).
* @param options The options object.
* @return A string result.
*/
protected abstract CharSequence safeApply(final Object context, final Options options);
/**
* Register the helper in a handlebars instance.
*
* @param handlebars A handlebars object. Required.
*/
public void registerHelper(final Handlebars handlebars) {
notNull(handlebars, "The handlebars is required.");
handlebars.registerHelper(name(), this);
}
/**
* Register all the text helpers.
*
* @param handlebars The helper's owner. Required.
*/
public static void register(final Handlebars handlebars) {
notNull(handlebars, "A handlebars object is required.");
StringHelpers[] helpers = values();
for (StringHelpers helper : helpers) {
helper.registerHelper(handlebars);
}
}
}
/**
* Number format styles.
*
* @author edgar.espina
* @since 1.0.1
*/
enum NumberStyle {
/**
* The default number format.
*/
DEFAULT {
@Override
public NumberFormat numberFormat(final Locale locale) {
return NumberFormat.getInstance(locale);
}
},
/**
* The integer number format.
*/
INTEGER {
@Override
public NumberFormat numberFormat(final Locale locale) {
return NumberFormat.getIntegerInstance(locale);
}
},
/**
* The currency number format.
*/
CURRENCY {
@Override
public NumberFormat numberFormat(final Locale locale) {
return NumberFormat.getCurrencyInstance(locale);
}
},
/**
* The percent number format.
*/
PERCENT {
@Override
public NumberFormat numberFormat(final Locale locale) {
return NumberFormat.getPercentInstance(locale);
}
};
/**
* Build a new number format.
*
* @param locale The locale to use.
* @return A new number format.
*/
public abstract NumberFormat numberFormat(Locale locale);
}
