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https://github.com/fadden/6502bench.git
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277 lines
11 KiB
C#
277 lines
11 KiB
C#
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/*
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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.Collections.Generic;
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using System.Diagnostics;
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using System.Drawing;
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using System.Text;
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namespace SourceGen {
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/// <summary>
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/// Representation of a multi-line comment, which is a string plus some format directives.
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/// Used for long comments and notes.
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///
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/// Instances are immutable.
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/// </summary>
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public class MultiLineComment {
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/// <summary>
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/// If set, sticks a MaxWidth "ruler" at the top, and makes spaces visible.
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/// </summary>
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public static bool DebugShowRuler { get; set; }
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/// <summary>
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/// Unformatted text.
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/// </summary>
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public string Text { get; private set; }
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/// <summary>
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/// Set to true to render text surrounded by a box of ASCII characters.
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/// </summary>
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public bool BoxMode { get; private set; }
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/// <summary>
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/// Maximum line width. Box mode effectively reduces this by four.
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/// </summary>
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public int MaxWidth { get; private set; }
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/// <summary>
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/// Background color for notes.
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/// </summary>
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public Color BackgroundColor { get; private set; }
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/// <summary>
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/// Constructor. Object will have a max width of 80 and not be boxed.
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/// </summary>
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/// <param name="text">Unformatted comment text.</param>
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public MultiLineComment(string text) {
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Debug.Assert(text != null); // empty string is okay
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Text = text;
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BoxMode = false;
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MaxWidth = 80;
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BackgroundColor = Color.FromArgb(0);
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}
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/// <summary>
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/// Constructor. Used for long comments.
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/// </summary>
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/// <param name="text">Unformatted text.</param>
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/// <param name="boxMode">Set to true to enable box mode.</param>
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/// <param name="maxWidth">Maximum line width.</param>
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public MultiLineComment(string text, bool boxMode, int maxWidth) : this(text) {
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Debug.Assert((!boxMode && maxWidth > 1) || (boxMode && maxWidth > 5));
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BoxMode = boxMode;
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MaxWidth = maxWidth;
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}
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/// <summary>
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/// Constructor. Used for notes.
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/// </summary>
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/// <param name="text">Unformatted text.</param>
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/// <param name="bkgndColor">Background color.</param>
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public MultiLineComment(string text, Color bkgndColor) : this(text) {
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BackgroundColor = bkgndColor;
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}
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/// <summary>
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/// Generates one or more lines of formatted text.
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/// </summary>
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/// <param name="formatter">Formatter, with comment delimiters.</param>
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/// <param name="textPrefix">String to prepend to text before formatting. If this
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/// is non-empty, comment delimiters aren't emitted. (Used for notes.)</param>
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/// <returns>Array of formatted strings.</returns>
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public List<string> FormatText(Asm65.Formatter formatter, string textPrefix) {
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const char boxChar = '*';
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const char spcRep = '\u2219';
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string workString = string.IsNullOrEmpty(textPrefix) ? Text : textPrefix + Text;
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List<string> lines = new List<string>();
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string linePrefix;
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if (!string.IsNullOrEmpty(textPrefix)) {
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linePrefix = string.Empty;
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} else if (BoxMode) {
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linePrefix = formatter.BoxLineCommentDelimiter;
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} else {
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linePrefix = formatter.FullLineCommentDelimiter;
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}
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StringBuilder sb = new StringBuilder(MaxWidth);
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if (DebugShowRuler) {
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for (int i = 0; i < MaxWidth; i++) {
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sb.Append((i % 10).ToString());
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}
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lines.Add(sb.ToString());
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sb.Clear();
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}
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string boxLine, spaces;
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if (BoxMode) {
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for (int i = 0; i < MaxWidth - linePrefix.Length; i++) {
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sb.Append(boxChar);
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}
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boxLine = sb.ToString();
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sb.Clear();
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for (int i = 0; i < MaxWidth; i++) {
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sb.Append(' ');
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}
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spaces = sb.ToString();
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sb.Clear();
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} else {
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boxLine = spaces = null;
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}
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if (BoxMode && workString.Length > 0) {
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lines.Add(linePrefix + boxLine);
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}
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int lineWidth = BoxMode ?
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MaxWidth - linePrefix.Length - 4 :
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MaxWidth - linePrefix.Length;
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int startIndex = 0;
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int breakIndex = -1;
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for (int i = 0; i < workString.Length; i++) {
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// Spaces and hyphens are different. For example, if width is 10,
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// "long words<space>more words" becomes:
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// 0123456789
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// long words
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// more words
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// However, "long words-more words" becomes:
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// long
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// words-more
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// words
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// because the hyphen is retained but the space is discarded.
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if (workString[i] == '\r' || workString[i] == '\n') {
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// explicit line break, emit line
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string str = workString.Substring(startIndex, i - startIndex);
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if (DebugShowRuler) { str = str.Replace(' ', spcRep); }
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if (BoxMode) {
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if (str == "" + boxChar) {
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// asterisk on a line by itself means "output row of asterisks"
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str = linePrefix + boxLine;
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} else {
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int padLen = lineWidth - str.Length;
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str = linePrefix + boxChar + " " + str +
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spaces.Substring(0, padLen + 1) + boxChar;
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}
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} else {
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str = linePrefix + str;
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}
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lines.Add(str);
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// Eat the LF in CRLF. We don't actually work right with just LF,
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// because this will consume LFLF, but it's okay to insist that the
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// string use CRLF for line breaks.
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if (i < workString.Length - 1 && workString[i + 1] == '\n') {
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i++;
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}
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startIndex = i + 1;
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breakIndex = -1;
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} else if (workString[i] == ' ') {
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// can break on a space even if it's one char too far
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breakIndex = i;
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}
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if (i - startIndex >= lineWidth) {
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// this character was one too many, break line one back
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if (breakIndex <= 0) {
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// no break found, just chop it
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string str = workString.Substring(startIndex, i - startIndex);
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if (DebugShowRuler) { str = str.Replace(' ', spcRep); }
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if (BoxMode) {
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str = linePrefix + boxChar + " " + str + " " + boxChar;
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} else {
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str = linePrefix + str;
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}
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lines.Add(str);
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startIndex = i;
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} else {
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// Copy everything from start to break. If the break was a hyphen,
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// we want to keep it.
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int adj = 0;
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if (workString[breakIndex] == '-') {
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adj = 1;
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}
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string str = workString.Substring(startIndex,
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breakIndex + adj - startIndex);
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if (DebugShowRuler) { str = str.Replace(' ', spcRep); }
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if (BoxMode) {
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int padLen = lineWidth - str.Length;
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str = linePrefix + boxChar + " " + str +
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spaces.Substring(0, padLen + 1) + boxChar;
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} else {
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str = linePrefix + str;
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}
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lines.Add(str);
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startIndex = breakIndex + 1;
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breakIndex = -1;
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}
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}
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if (workString[i] == '-') {
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// can break on hyphen if it fits in line
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breakIndex = i;
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}
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}
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if (startIndex < workString.Length) {
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// Output remainder.
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string str = workString.Substring(startIndex, workString.Length - startIndex);
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if (DebugShowRuler) { str = str.Replace(' ', spcRep); }
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if (BoxMode) {
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int padLen = lineWidth - str.Length;
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str = linePrefix + boxChar + " " + str +
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spaces.Substring(0, padLen + 1) + boxChar;
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} else {
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str = linePrefix + str;
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}
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lines.Add(str);
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}
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if (BoxMode && workString.Length > 0) {
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lines.Add(linePrefix + boxLine);
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}
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return lines;
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}
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public override string ToString() {
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return "MLC box=" + BoxMode + " width=" + MaxWidth + " text='" + Text + "'";
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}
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public static bool operator ==(MultiLineComment a, MultiLineComment b) {
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if (ReferenceEquals(a, b)) {
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return true; // same object, or both null
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}
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if (ReferenceEquals(a, null) || ReferenceEquals(b, null)) {
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return false; // one is null
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}
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return a.Text.Equals(b.Text) && a.BoxMode == b.BoxMode && a.MaxWidth == b.MaxWidth
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&& a.BackgroundColor == b.BackgroundColor;
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}
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public static bool operator !=(MultiLineComment a, MultiLineComment b) {
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return !(a == b);
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}
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public override bool Equals(object obj) {
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return obj is MultiLineComment && this == (MultiLineComment)obj;
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}
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public override int GetHashCode() {
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return Text.GetHashCode() ^ MaxWidth ^ (BoxMode ? 1 : 0) ^ BackgroundColor.ToArgb();
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}
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}
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}
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