100 lines
3.1 KiB
Java
100 lines
3.1 KiB
Java
package com.bytezone.diskbrowser.applefile;
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import static com.bytezone.diskbrowser.utilities.Utility.ASCII_COLON;
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import static com.bytezone.diskbrowser.utilities.Utility.ASCII_QUOTE;
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import static com.bytezone.diskbrowser.utilities.Utility.getShort;
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import java.util.ArrayList;
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import java.util.List;
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import com.bytezone.diskbrowser.utilities.Utility;
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// -----------------------------------------------------------------------------------//
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public class SourceLine implements ApplesoftConstants
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// -----------------------------------------------------------------------------------//
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{
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ApplesoftBasicProgram program;
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int linkField;
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int lineNumber;
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int linePtr;
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int length;
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byte[] buffer;
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List<SubLine> sublines = new ArrayList<> ();
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// ---------------------------------------------------------------------------------//
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SourceLine (ApplesoftBasicProgram program, byte[] buffer, int ptr)
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// ---------------------------------------------------------------------------------//
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{
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this.program = program;
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this.buffer = buffer;
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linePtr = ptr;
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linkField = getShort (buffer, ptr);
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lineNumber = getShort (buffer, ptr + 2);
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int startPtr = ptr += 4; // skip link field and lineNumber
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boolean inString = false; // can toggle
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boolean inRemark = false; // can only go false -> true
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byte b;
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while (ptr < buffer.length && (b = buffer[ptr++]) != 0)
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{
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if (inRemark) // cannot terminate a REM
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continue;
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if (inString)
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{
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if (b == ASCII_QUOTE) // terminate string
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inString = false;
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continue;
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}
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switch (b)
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{
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// break IF statements into two sublines (allows for easier line indenting)
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case TOKEN_IF:
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while (buffer[ptr] != TOKEN_THEN && buffer[ptr] != TOKEN_GOTO
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&& buffer[ptr] != 0)
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ptr++;
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if (buffer[ptr] == TOKEN_THEN) // keep THEN with the IF
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++ptr;
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startPtr = addSubLine (startPtr, ptr); // create subline from the condition
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break;
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case ASCII_COLON: // end of subline
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startPtr = addSubLine (startPtr, ptr);
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break;
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case TOKEN_REM:
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if (ptr == startPtr + 1) // at start of line
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inRemark = true;
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else // mid-line - should be illegal
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{
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System.out.printf ("%s : %5d mid-line REM token%n", program.name, lineNumber);
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startPtr = addSubLine (startPtr, --ptr); // point back to the REM
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}
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break;
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case Utility.ASCII_QUOTE:
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inString = true;
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break;
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}
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}
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length = ptr - linePtr;
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addSubLine (startPtr, ptr);
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}
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// ---------------------------------------------------------------------------------//
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private int addSubLine (int startPtr, int ptr)
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// ---------------------------------------------------------------------------------//
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{
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sublines.add (new SubLine (this, startPtr, ptr - startPtr));
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return ptr;
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}
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}
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