mirror of
https://github.com/fadden/6502bench.git
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228 lines
8.6 KiB
C#
228 lines
8.6 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.Diagnostics;
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namespace SourceGen.AsmGen {
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/// <summary>
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/// Multi-line string gatherer. Accumulates characters and raw bytes, emitting
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/// them when we have a full operand's worth.
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///
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/// If the delimiter character appears, it will be output inline as a raw byte.
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/// The low-ASCII string ['hello'world'] will become [27,'hello',27,'world',27]
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/// (or something similar).
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/// </summary>
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public class StringGather {
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// Inputs.
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public IGenerator Gen { get; private set; }
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public string Label { get; private set; }
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public string Opcode { get; private set; }
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public string Comment { get; private set; }
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public char Delimiter { get; private set; }
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public char DelimiterReplacement { get; private set; }
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public ByteStyle ByteStyleX { get; private set; }
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public int MaxOperandLen { get; private set; }
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public bool IsTestRun { get; private set; }
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public enum ByteStyle { DenseHex, CommaSep };
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// Outputs.
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public bool HasDelimiter { get; private set; }
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public int NumLinesOutput { get; private set; }
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private char[] mHexChars;
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/// <summary>
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/// Character collection buffer. The delimiters are written into the buffer
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/// because they're mixed with bytes, particularly when we have to escape the
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/// delimiter character. Strings might start or end with escaped delimiters,
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/// so we don't add them until we have to.
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private char[] mBuffer;
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/// <summary>
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/// Next available character position.
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/// </summary>
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private int mIndex = 0;
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/// <summary>
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/// State of the buffer, based on the last thing we added.
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/// </summary>
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private enum State {
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Unknown = 0,
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StartOfLine,
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InQuote,
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OutQuote
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}
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private State mState = State.StartOfLine;
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="gen">Reference back to generator, for output function and
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/// format options.</param>
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/// <param name="label">Line label. Appears on first output line only.</param>
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/// <param name="opcode">Opcode to use for all lines.</param>
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/// <param name="comment">End-of-line comment. Appears on first output line
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/// only.</param>
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/// <param name="delimiter">String delimiter character.</param>
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/// <param name="isTestRun">If true, no file output is produced.</param>
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public StringGather(IGenerator gen, string label, string opcode,
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string comment, char delimiter, char delimReplace, ByteStyle byteStyle,
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int maxOperandLen, bool isTestRun) {
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Gen = gen;
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Label = label;
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Opcode = opcode;
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Comment = comment;
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Delimiter = delimiter;
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DelimiterReplacement = delimReplace;
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ByteStyleX = byteStyle;
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MaxOperandLen = maxOperandLen;
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IsTestRun = isTestRun;
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mBuffer = new char[MaxOperandLen];
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mHexChars = Gen.SourceFormatter.HexDigits;
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}
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/// <summary>
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/// Write a character into the buffer.
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/// </summary>
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/// <param name="ch">Character to add.</param>
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public void WriteChar(char ch) {
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Debug.Assert(ch >= 0 && ch <= 0xff);
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if (ch == Delimiter) {
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// Must write it as a byte.
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HasDelimiter = true;
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WriteByte((byte)DelimiterReplacement);
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return;
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}
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// If we're at the start of a line, add delimiter, then new char.
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// If we're inside quotes, just add the character. We must have space for
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// two chars (new char, close quote).
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// If we're outside quotes, add a comma and delimiter, then the character.
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// We must have 4 chars remaining (comma, open quote, new char, close quote).
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switch (mState) {
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case State.StartOfLine:
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mBuffer[mIndex++] = Delimiter;
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break;
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case State.InQuote:
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if (mIndex + 2 > MaxOperandLen) {
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Flush();
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mBuffer[mIndex++] = Delimiter;
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}
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break;
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case State.OutQuote:
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if (mIndex + 4 > MaxOperandLen) {
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Flush();
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mBuffer[mIndex++] = Delimiter;
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} else {
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mBuffer[mIndex++] = ',';
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mBuffer[mIndex++] = Delimiter;
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}
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break;
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default:
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Debug.Assert(false);
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break;
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}
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mBuffer[mIndex++] = ch;
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mState = State.InQuote;
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}
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/// <summary>
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/// Write a hex value into the buffer.
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/// </summary>
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/// <param name="val">Value to add.</param>
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public void WriteByte(byte val) {
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// If we're at the start of a line, just output the byte.
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// If we're inside quotes, emit a delimiter, comma, and the byte. We must
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// have space for four (DenseHex) or five (CommaSep) chars.
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// If we're outside quotes, add the byte. We must have two (DenseHex) or
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// four (CommaSep) chars remaining.
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switch (mState) {
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case State.StartOfLine:
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break;
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case State.InQuote:
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int minWidth = (ByteStyleX == ByteStyle.CommaSep) ? 5 : 4;
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if (mIndex + minWidth > MaxOperandLen) {
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Flush();
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} else {
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mBuffer[mIndex++] = Delimiter;
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mBuffer[mIndex++] = ',';
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}
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break;
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case State.OutQuote:
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minWidth = (ByteStyleX == ByteStyle.CommaSep) ? 4 : 2;
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if (mIndex + minWidth > MaxOperandLen) {
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Flush();
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} else {
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if (ByteStyleX == ByteStyle.CommaSep) {
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mBuffer[mIndex++] = ',';
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}
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}
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break;
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default:
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Debug.Assert(false);
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break;
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}
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if (ByteStyleX == ByteStyle.CommaSep) {
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mBuffer[mIndex++] = '$';
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}
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mBuffer[mIndex++] = mHexChars[val >> 4];
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mBuffer[mIndex++] = mHexChars[val & 0x0f];
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mState = State.OutQuote;
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}
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/// <summary>
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/// Tells the object to flush any pending data to the output.
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/// </summary>
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public void Finish() {
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Flush();
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}
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/// <summary>
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/// Outputs the buffer of pending data. A closing delimiter will be added if needed.
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/// </summary>
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private void Flush() {
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switch (mState) {
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case State.StartOfLine:
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// empty string; put out a pair of delimiters
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mBuffer[mIndex++] = Delimiter;
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mBuffer[mIndex++] = Delimiter;
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NumLinesOutput++;
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break;
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case State.InQuote:
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// add delimiter and finish
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mBuffer[mIndex++] = Delimiter;
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NumLinesOutput++;
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break;
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case State.OutQuote:
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// just output it
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NumLinesOutput++;
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break;
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}
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if (!IsTestRun) {
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Gen.OutputLine(Label, Opcode, new string(mBuffer, 0, mIndex),
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Comment);
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}
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mIndex = 0;
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// Erase these after first use so we don't put them on every line.
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Label = Comment = string.Empty;
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}
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}
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}
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