115 lines
2.9 KiB
Java
115 lines
2.9 KiB
Java
/**
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* Copyright (c) 2011-2019, James Zhan 詹波 (jfinal@126.com).
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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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package com.jfinal.template.stat;
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/**
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* CharTable 空间换时间优化字符判断性能
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* 负值参数强转 char 会自动变正值，无需判断负值数组下标
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* isLetter(EOF) 不会下标越界
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*/
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public class CharTable {
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private static final char[] letterChars = buildLetterChars();
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private static final char[] letterOrDigitChars = buildLetterOrDigitChars();
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private static final char[] exprChars = buildExprChars();
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private static final char NULL = 0;
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private static final char SIZE = 128;
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private CharTable(){}
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private static char[] createCharArray() {
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char[] ret = new char[SIZE];
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for (char i=0; i<SIZE; i++) {
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ret[i] = NULL;
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}
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return ret;
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}
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private static char[] buildLetterChars() {
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char[] ret = createCharArray();
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for (char i='a'; i<='z'; i++) {
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ret[i] = i;
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}
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for (char i='A'; i<='Z'; i++) {
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ret[i] = i;
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}
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ret['_'] = '_'; // 包含下划线字符 '_'
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return ret;
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}
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private static char[] buildLetterOrDigitChars() {
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char[] ret = buildLetterChars();
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for (char i='0'; i<='9'; i++) {
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ret[i] = i;
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}
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return ret;
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}
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private static char[] buildExprChars() {
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char[] ret = createCharArray();
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ret['\t'] = '\t';
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ret['\n'] = '\n';
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ret['\r'] = '\r';
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for (char i=' '; i<='}'; i++) {
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ret[i] = i;
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}
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ret['#'] = NULL;
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ret['$'] = NULL;
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ret['@'] = NULL;
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ret['\\'] = NULL;
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ret['^'] = NULL;
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ret['`'] = NULL;
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return ret;
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}
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public static boolean isLetter(char c) {
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return c < SIZE && letterChars[c] != NULL;
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}
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public static boolean isLetterOrDigit(char c) {
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return c < SIZE && letterOrDigitChars[c] != NULL;
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}
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public static boolean isExprChar(char c) {
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return c < SIZE && exprChars[c] != NULL;
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}
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public static boolean isDigit(char c) {
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return c >= '0' && c <= '9';
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}
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public static boolean isBlank(char c) {
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return c == ' ' || c == '\t'; // \t\r\u000C
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}
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public static boolean isBlankOrLineFeed(char c) {
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return c == ' ' || c == '\t' || c == '\r' || c == '\n'; // \t\r\n\u000C
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}
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public static boolean isHexadecimalDigit(char c) {
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return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
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}
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public static boolean isOctalDigit(char c) {
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return c >= '0' && c <= '7';
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}
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}
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