| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.api.scripting; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Formatter is a class to get the type conversion between javascript types and |
| * java types for the format (sprintf) method working. |
| * |
| * <p>In javascript the type for numbers can be different from the format type |
| * specifier. For format type '%d', '%o', '%x', '%X' double need to be |
| * converted to integer. For format type 'e', 'E', 'f', 'g', 'G', 'a', 'A' |
| * integer needs to be converted to double. |
| * |
| * <p>Format type "%c" and javascript string needs special handling. |
| * |
| * <p>The javascript date objects can be handled if they are type double (the |
| * related javascript code will convert with Date.getTime() to double). So |
| * double date types are converted to long. |
| * |
| * <p>Pattern and the logic for parameter position: java.util.Formatter |
| * |
| */ |
| final class Formatter { |
| |
| private Formatter() { |
| } |
| |
| /** |
| * Method which converts javascript types to java types for the |
| * String.format method (jrunscript function sprintf). |
| * |
| * @param format a format string |
| * @param args arguments referenced by the format specifiers in format |
| * @return a formatted string |
| */ |
| static String format(final String format, final Object[] args) { |
| final Matcher m = FS_PATTERN.matcher(format); |
| int positionalParameter = 1; |
| |
| while (m.find()) { |
| int index = index(m.group(1)); |
| final boolean previous = isPreviousArgument(m.group(2)); |
| final char conversion = m.group(6).charAt(0); |
| |
| // skip over some formats |
| if (index < 0 || previous |
| || conversion == 'n' || conversion == '%') { |
| continue; |
| } |
| |
| // index 0 here means take a positional parameter |
| if (index == 0) { |
| index = positionalParameter++; |
| } |
| |
| // out of index, String.format will handle |
| if (index > args.length) { |
| continue; |
| } |
| |
| // current argument |
| final Object arg = args[index - 1]; |
| |
| // for date we convert double to long |
| if (m.group(5) != null) { |
| // convert double to long |
| if (arg instanceof Double) { |
| args[index - 1] = ((Double) arg).longValue(); |
| } |
| } else { |
| // we have to convert some types |
| switch (conversion) { |
| case 'd': |
| case 'o': |
| case 'x': |
| case 'X': |
| if (arg instanceof Double) { |
| // convert double to long |
| args[index - 1] = ((Double) arg).longValue(); |
| } else if (arg instanceof String |
| && ((String) arg).length() > 0) { |
| // convert string (first character) to int |
| args[index - 1] = (int) ((String) arg).charAt(0); |
| } |
| break; |
| case 'e': |
| case 'E': |
| case 'f': |
| case 'g': |
| case 'G': |
| case 'a': |
| case 'A': |
| if (arg instanceof Integer) { |
| // convert integer to double |
| args[index - 1] = ((Integer) arg).doubleValue(); |
| } |
| break; |
| case 'c': |
| if (arg instanceof Double) { |
| // convert double to integer |
| args[index - 1] = ((Double) arg).intValue(); |
| } else if (arg instanceof String |
| && ((String) arg).length() > 0) { |
| // get the first character from string |
| args[index - 1] = (int) ((String) arg).charAt(0); |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| return String.format(format, args); |
| } |
| |
| /** |
| * Method to parse the integer of the argument index. |
| * |
| * @param s string to parse |
| * @return -1 if parsing failed, 0 if string is null, > 0 integer |
| */ |
| private static int index(final String s) { |
| int index = -1; |
| |
| if (s != null) { |
| try { |
| index = Integer.parseInt(s.substring(0, s.length() - 1)); |
| } catch (final NumberFormatException e) { |
| //ignored |
| } |
| } else { |
| index = 0; |
| } |
| |
| return index; |
| } |
| |
| /** |
| * Method to check if a string contains '<'. This is used to find out if |
| * previous parameter is used. |
| * |
| * @param s string to check |
| * @return true if '<' is in the string, else false |
| */ |
| private static boolean isPreviousArgument(final String s) { |
| return (s != null && s.indexOf('<') >= 0) ? true : false; |
| } |
| |
| // %[argument_index$][flags][width][.precision][t]conversion |
| private static final String formatSpecifier = |
| "%(\\d+\\$)?([-#+ 0,(\\<]*)?(\\d+)?(\\.\\d+)?([tT])?([a-zA-Z%])"; |
| // compiled format string |
| private static final Pattern FS_PATTERN; |
| |
| static { |
| FS_PATTERN = Pattern.compile(formatSpecifier); |
| } |
| } |