mirror of
https://github.com/fadden/6502bench.git
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242 lines
9.7 KiB
C#
242 lines
9.7 KiB
C#
/*
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* Copyright 2018 faddenSoft
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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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using System;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace CommonUtil {
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/// <summary>
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/// Text utility functions.
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/// </summary>
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public static class TextUtil {
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// 100 spaces, useful when padding things out.
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private const string SPACES = " " +
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" ";
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private static readonly char[] CSV_ESCAPE_CHARS = { ',', '"' };
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private const string NonPrintableAsciiPattern = @"[^\u0020-\u007e]";
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private static Regex sNonPrintableAsciiRegex = new Regex(NonPrintableAsciiPattern);
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/// <summary>
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/// Converts a string to an ASCII-only string, replacing iso-latin characters
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/// with their ASCII equivalents. This may change the length of the string.
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///
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/// For example, "¿Dónde está Über bären?" becomes "Donde esta Uber baren?".
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/// </summary>
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/// <param name="inString"></param>
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/// <returns>Converted string.</returns>
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public static string LatinToAscii(string inString) {
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// https://stackoverflow.com/questions/140422/
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var newStringBuilder = new StringBuilder();
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newStringBuilder.Append(inString.Normalize(NormalizationForm.FormKD)
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.Where(x => x < 128)
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.ToArray());
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return newStringBuilder.ToString();
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// Alternatively?
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// System.Text.Encoding.ASCII.GetString(
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// System.Text.Encoding.GetEncoding(1251).GetBytes(text))
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}
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/// <summary>
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/// Returns true if the value is valid high- or low-ASCII.
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/// </summary>
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/// <param name="val">Value to test.</param>
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/// <returns>True if val is valid ASCII.</returns>
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public static bool IsHiLoAscii(int val) {
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return (val >= 0x20 && val < 0x7f) || (val >= 0xa0 && val < 0xff);
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}
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/// <summary>
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/// Determines whether the character is printable ASCII.
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/// </summary>
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/// <param name="ch">Character to evaluate.</param>
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/// <returns>True if the character is printable ASCII.</returns>
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public static bool IsPrintableAscii(char ch) {
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return ch >= 0x20 && ch < 0x7f;
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}
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/// <summary>
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/// Determines whether the string has nothing but printable ASCII characters in it.
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/// </summary>
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/// <param name="str">String to evaluate.</param>
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/// <returns>True if all characters are printable ASCII.</returns>
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public static bool IsPrintableAscii(string str) {
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// Linq version: return str.Any(c => c < 0x20 || c > 0x7e);
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MatchCollection matches = sNonPrintableAsciiRegex.Matches(str);
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return matches.Count == 0;
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}
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/// <summary>
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/// Converts high-ASCII bytes to a string.
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/// </summary>
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/// <param name="data">Array of bytes with ASCII data.</param>
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/// <param name="offset">Start offset.</param>
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/// <param name="length">String length.</param>
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/// <returns>Converted string.</returns>
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public static string HighAsciiToString(byte[] data, int offset, int length) {
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StringBuilder sb = new StringBuilder(length);
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for (int i = offset; i < offset + length; i++) {
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sb.Append((char)(data[i] & 0x7f));
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}
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return sb.ToString();
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}
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/// <summary>
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/// Trims whitespace off the end of a StringBuilder.
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/// </summary>
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/// <param name="sb">StringBuilder reference.</param>
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public static void TrimEnd(StringBuilder sb) {
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const string WSPC = " \t\r\n";
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int len = sb.Length;
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while (WSPC.IndexOf(sb[len - 1]) >= 0) {
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len--;
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}
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sb.Length = len;
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}
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/// <summary>
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/// Replaces all occurrences of a string with another string, but only if they appear
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/// outside quoted text. Useful for replacing structural bits of a JSON string without
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/// messing with the quoted items. Assumes that quoted quotes (backslash-quote) only
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/// appear inside quoted text.
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/// </summary>
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/// <param name="inStr"></param>
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/// <param name="findStr"></param>
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/// <param name="repStr"></param>
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public static string NonQuoteReplace(string inStr, string findStr, string repStr) {
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// There's probably a better way to do this...
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StringBuilder sb = new StringBuilder(inStr.Length + inStr.Length / 20);
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int cmpLen = findStr.Length;
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bool findStrQuote = findStr.Contains('\"'); // find/rep str switches to in-quote
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Debug.Assert(findStrQuote == repStr.Contains('\"'));
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bool inQuote = false;
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for (int i = 0; i < inStr.Length; i++) {
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char ch = inStr[i];
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if (inQuote) {
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// Check to see if the double-quote is quoted. It's safe to back up
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// one because we don't start in-quote.
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if (ch == '\"' && inStr[i-1] != '\\') {
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inQuote = false;
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} else {
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// in quoted text, keep going
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}
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sb.Append(ch);
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} else {
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if (string.Compare(inStr, i, findStr, 0, cmpLen) == 0) {
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sb.Append(repStr);
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i += cmpLen - 1;
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inQuote = findStrQuote;
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} else {
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if (ch == '"') {
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// There are no quoted-quotes outside of quotes, so we don't need
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// to check for a '\'.
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inQuote = true;
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}
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sb.Append(ch);
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}
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}
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}
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return sb.ToString();
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}
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/// <summary>
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/// Pads a string with trailing spaces so that the total length of the line, including
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/// previous contents, is the length specified. One trailing space will be added even
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/// if the string's length is >= toLen.
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///
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/// You must begin with an empty StringBuilder at the start of each line.
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/// </summary>
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/// <param name="sb">StringBuilder to append to.</param>
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/// <param name="str">String to add.</param>
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/// <param name="toLen">Total line width to pad to.</param>
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public static void AppendPaddedString(StringBuilder sb, string str, int toLen) {
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if (str == null) {
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str = string.Empty;
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}
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int newLen = sb.Length + str.Length;
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if (newLen >= toLen) {
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sb.Append(str);
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sb.Append(' ');
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} else {
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sb.Append(str);
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// would be nice to avoid this allocation/copy
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sb.Append(SPACES.Substring(0, toLen - newLen));
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}
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}
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/// <summary>
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/// Escapes a string for CSV.
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/// </summary>
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/// <param name="str">String to process.</param>
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/// <returns>Escaped string, or an empty string if the input was null.</returns>
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public static string EscapeCSV(string str) {
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if (str == null) {
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return string.Empty;
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}
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bool needQuote = (str.IndexOfAny(CSV_ESCAPE_CHARS) >= 0);
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if (needQuote) {
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return '"' + str.Replace("\"", "\"\"") + '"';
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} else {
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return str;
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}
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}
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/// <summary>
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/// Serializes an integer array into a string.
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/// </summary>
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/// <param name="values">Array to serialize.</param>
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/// <returns>Serialized data.</returns>
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public static string SerializeIntArray(int[] values) {
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StringBuilder sb = new StringBuilder(64);
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sb.Append("int[]");
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for (int i = 0; i < values.Length; i++) {
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sb.Append(',');
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sb.Append(values[i]);
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}
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return sb.ToString();
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}
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/// <summary>
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/// Deserializes an integer array from a string.
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/// </summary>
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/// <param name="cereal"></param>
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/// <returns></returns>
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public static int[] DeserializeIntArray(string cereal) {
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string[] splitted = cereal.Split(',');
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if (splitted.Length == 0) {
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throw new Exception("Bad serialized int[]");
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}
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if (splitted[0] != "int[]") {
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throw new Exception("Bad serialized int[], started with " + splitted[0]);
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}
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int[] arr = new int[splitted.Length - 1];
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try {
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for (int i = 1; i < splitted.Length; i++) {
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arr[i - 1] = int.Parse(splitted[i]);
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}
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} catch (Exception ex) {
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throw new Exception("Bad serialized int[]: " + ex.Message);
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}
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return arr;
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}
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}
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}
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