/*
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* Copyright (C) 2010 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*namespace com.google.zxing.common {*/
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/*import java.nio.charset.Charset;*/
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/*import java.util.Map;*/
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import DecodeHintType from '../DecodeHintType';
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import CharacterSetECI from './CharacterSetECI';
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import StringEncoding from '../util/StringEncoding';
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/**
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* Common string-related functions.
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*
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* @author Sean Owen
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* @author Alex Dupre
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*/
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var StringUtils = /** @class */ (function () {
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function StringUtils() {
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}
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// SHIFT_JIS.equalsIgnoreCase(PLATFORM_DEFAULT_ENCODING) ||
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// EUC_JP.equalsIgnoreCase(PLATFORM_DEFAULT_ENCODING);
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StringUtils.castAsNonUtf8Char = function (code, encoding) {
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if (encoding === void 0) { encoding = null; }
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// ISO 8859-1 is the Java default as UTF-8 is JavaScripts
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// you can see this method as a Java version of String.fromCharCode
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var e = encoding ? encoding.getName() : this.ISO88591;
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// use passed format (fromCharCode will return UTF8 encoding)
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return StringEncoding.decode(new Uint8Array([code]), e);
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};
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/**
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* @param bytes bytes encoding a string, whose encoding should be guessed
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* @param hints decode hints if applicable
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* @return name of guessed encoding; at the moment will only guess one of:
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* {@link #SHIFT_JIS}, {@link #UTF8}, {@link #ISO88591}, or the platform
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* default encoding if none of these can possibly be correct
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*/
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StringUtils.guessEncoding = function (bytes, hints) {
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if (hints !== null && hints !== undefined && undefined !== hints.get(DecodeHintType.CHARACTER_SET)) {
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return hints.get(DecodeHintType.CHARACTER_SET).toString();
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}
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// For now, merely tries to distinguish ISO-8859-1, UTF-8 and Shift_JIS,
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// which should be by far the most common encodings.
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var length = bytes.length;
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var canBeISO88591 = true;
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var canBeShiftJIS = true;
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var canBeUTF8 = true;
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var utf8BytesLeft = 0;
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// int utf8LowChars = 0
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var utf2BytesChars = 0;
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var utf3BytesChars = 0;
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var utf4BytesChars = 0;
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var sjisBytesLeft = 0;
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// int sjisLowChars = 0
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var sjisKatakanaChars = 0;
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// int sjisDoubleBytesChars = 0
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var sjisCurKatakanaWordLength = 0;
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var sjisCurDoubleBytesWordLength = 0;
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var sjisMaxKatakanaWordLength = 0;
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var sjisMaxDoubleBytesWordLength = 0;
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// int isoLowChars = 0
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// int isoHighChars = 0
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var isoHighOther = 0;
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var utf8bom = bytes.length > 3 &&
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bytes[0] === /*(byte) */ 0xEF &&
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bytes[1] === /*(byte) */ 0xBB &&
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bytes[2] === /*(byte) */ 0xBF;
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for (var i = 0; i < length && (canBeISO88591 || canBeShiftJIS || canBeUTF8); i++) {
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var value = bytes[i] & 0xFF;
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// UTF-8 stuff
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if (canBeUTF8) {
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if (utf8BytesLeft > 0) {
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if ((value & 0x80) === 0) {
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canBeUTF8 = false;
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}
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else {
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utf8BytesLeft--;
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}
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}
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else if ((value & 0x80) !== 0) {
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if ((value & 0x40) === 0) {
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canBeUTF8 = false;
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}
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else {
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utf8BytesLeft++;
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if ((value & 0x20) === 0) {
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utf2BytesChars++;
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}
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else {
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utf8BytesLeft++;
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if ((value & 0x10) === 0) {
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utf3BytesChars++;
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}
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else {
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utf8BytesLeft++;
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if ((value & 0x08) === 0) {
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utf4BytesChars++;
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}
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else {
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canBeUTF8 = false;
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}
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}
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}
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}
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} // else {
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// utf8LowChars++
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// }
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}
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// ISO-8859-1 stuff
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if (canBeISO88591) {
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if (value > 0x7F && value < 0xA0) {
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canBeISO88591 = false;
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}
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else if (value > 0x9F) {
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if (value < 0xC0 || value === 0xD7 || value === 0xF7) {
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isoHighOther++;
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} // else {
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// isoHighChars++
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// }
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} // else {
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// isoLowChars++
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// }
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}
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// Shift_JIS stuff
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if (canBeShiftJIS) {
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if (sjisBytesLeft > 0) {
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if (value < 0x40 || value === 0x7F || value > 0xFC) {
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canBeShiftJIS = false;
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}
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else {
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sjisBytesLeft--;
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}
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}
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else if (value === 0x80 || value === 0xA0 || value > 0xEF) {
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canBeShiftJIS = false;
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}
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else if (value > 0xA0 && value < 0xE0) {
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sjisKatakanaChars++;
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sjisCurDoubleBytesWordLength = 0;
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sjisCurKatakanaWordLength++;
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if (sjisCurKatakanaWordLength > sjisMaxKatakanaWordLength) {
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sjisMaxKatakanaWordLength = sjisCurKatakanaWordLength;
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}
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}
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else if (value > 0x7F) {
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sjisBytesLeft++;
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// sjisDoubleBytesChars++
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sjisCurKatakanaWordLength = 0;
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sjisCurDoubleBytesWordLength++;
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if (sjisCurDoubleBytesWordLength > sjisMaxDoubleBytesWordLength) {
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sjisMaxDoubleBytesWordLength = sjisCurDoubleBytesWordLength;
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}
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}
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else {
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// sjisLowChars++
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sjisCurKatakanaWordLength = 0;
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sjisCurDoubleBytesWordLength = 0;
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}
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}
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}
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if (canBeUTF8 && utf8BytesLeft > 0) {
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canBeUTF8 = false;
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}
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if (canBeShiftJIS && sjisBytesLeft > 0) {
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canBeShiftJIS = false;
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}
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// Easy -- if there is BOM or at least 1 valid not-single byte character (and no evidence it can't be UTF-8), done
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if (canBeUTF8 && (utf8bom || utf2BytesChars + utf3BytesChars + utf4BytesChars > 0)) {
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return StringUtils.UTF8;
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}
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// Easy -- if assuming Shift_JIS or at least 3 valid consecutive not-ascii characters (and no evidence it can't be), done
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if (canBeShiftJIS && (StringUtils.ASSUME_SHIFT_JIS || sjisMaxKatakanaWordLength >= 3 || sjisMaxDoubleBytesWordLength >= 3)) {
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return StringUtils.SHIFT_JIS;
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}
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// Distinguishing Shift_JIS and ISO-8859-1 can be a little tough for short words. The crude heuristic is:
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// - If we saw
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// - only two consecutive katakana chars in the whole text, or
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// - at least 10% of bytes that could be "upper" not-alphanumeric Latin1,
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// - then we conclude Shift_JIS, else ISO-8859-1
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if (canBeISO88591 && canBeShiftJIS) {
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return (sjisMaxKatakanaWordLength === 2 && sjisKatakanaChars === 2) || isoHighOther * 10 >= length
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? StringUtils.SHIFT_JIS : StringUtils.ISO88591;
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}
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// Otherwise, try in order ISO-8859-1, Shift JIS, UTF-8 and fall back to default platform encoding
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if (canBeISO88591) {
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return StringUtils.ISO88591;
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}
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if (canBeShiftJIS) {
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return StringUtils.SHIFT_JIS;
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}
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if (canBeUTF8) {
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return StringUtils.UTF8;
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}
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// Otherwise, we take a wild guess with platform encoding
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return StringUtils.PLATFORM_DEFAULT_ENCODING;
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};
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/**
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*
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* @see https://stackoverflow.com/a/13439711/4367683
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*
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* @param append The new string to append.
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* @param args Argumets values to be formated.
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*/
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StringUtils.format = function (append) {
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var args = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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args[_i - 1] = arguments[_i];
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}
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var i = -1;
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function callback(exp, p0, p1, p2, p3, p4) {
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if (exp === '%%')
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return '%';
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if (args[++i] === undefined)
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return undefined;
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exp = p2 ? parseInt(p2.substr(1)) : undefined;
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var base = p3 ? parseInt(p3.substr(1)) : undefined;
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var val;
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switch (p4) {
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case 's':
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val = args[i];
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break;
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case 'c':
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val = args[i][0];
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break;
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case 'f':
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val = parseFloat(args[i]).toFixed(exp);
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break;
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case 'p':
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val = parseFloat(args[i]).toPrecision(exp);
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break;
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case 'e':
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val = parseFloat(args[i]).toExponential(exp);
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break;
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case 'x':
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val = parseInt(args[i]).toString(base ? base : 16);
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break;
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case 'd':
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val = parseFloat(parseInt(args[i], base ? base : 10).toPrecision(exp)).toFixed(0);
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break;
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}
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val = typeof val === 'object' ? JSON.stringify(val) : (+val).toString(base);
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var size = parseInt(p1); /* padding size */
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var ch = p1 && (p1[0] + '') === '0' ? '0' : ' '; /* isnull? */
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while (val.length < size)
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val = p0 !== undefined ? val + ch : ch + val; /* isminus? */
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return val;
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}
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var regex = /%(-)?(0?[0-9]+)?([.][0-9]+)?([#][0-9]+)?([scfpexd%])/g;
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return append.replace(regex, callback);
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};
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/**
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*
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*/
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StringUtils.getBytes = function (str, encoding) {
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return StringEncoding.encode(str, encoding);
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};
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/**
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* Returns the charcode at the specified index or at index zero.
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*/
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StringUtils.getCharCode = function (str, index) {
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if (index === void 0) { index = 0; }
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return str.charCodeAt(index);
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};
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/**
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* Returns char for given charcode
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*/
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StringUtils.getCharAt = function (charCode) {
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return String.fromCharCode(charCode);
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};
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StringUtils.SHIFT_JIS = CharacterSetECI.SJIS.getName(); // "SJIS"
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StringUtils.GB2312 = 'GB2312';
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StringUtils.ISO88591 = CharacterSetECI.ISO8859_1.getName(); // "ISO8859_1"
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StringUtils.EUC_JP = 'EUC_JP';
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StringUtils.UTF8 = CharacterSetECI.UTF8.getName(); // "UTF8"
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StringUtils.PLATFORM_DEFAULT_ENCODING = StringUtils.UTF8; // "UTF8"//Charset.defaultCharset().name()
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StringUtils.ASSUME_SHIFT_JIS = false;
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return StringUtils;
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}());
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export default StringUtils;
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