656 lines
20 KiB
C++
656 lines
20 KiB
C++
/*
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* CiderPress
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* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
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* See the file LICENSE for distribution terms.
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*/
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/*
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* Import BASIC programs stored in a text file.
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*
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* The current implementation is a bit lame. It just dumps text strings into
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* a read-only edit buffer, instead of providing a nicer UI. The real trouble
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* with this style of interface is that i18n is even more awkward.
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*/
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#include "StdAfx.h"
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#include "../reformat/BASIC.h"
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#include "BasicImport.h"
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/*
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* ==========================================================================
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* BASTokenLookup
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* ==========================================================================
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*/
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void BASTokenLookup::Init(const char* tokenList, int numTokens, int tokenLen)
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{
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int i;
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ASSERT(tokenList != NULL);
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ASSERT(numTokens > 0);
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ASSERT(tokenLen > 0);
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delete[] fTokenPtr; // in case we're being re-initialized
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delete[] fTokenLen;
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fTokenPtr = new const char*[numTokens];
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fTokenLen = new int[numTokens];
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fNumTokens = numTokens;
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for (i = 0; i < numTokens; i++) {
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fTokenPtr[i] = tokenList;
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fTokenLen[i] = strlen(tokenList);
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tokenList += tokenLen;
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}
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}
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int BASTokenLookup::Lookup(const char* str, int len, int* pFoundLen)
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{
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int longestIndex, longestLen;
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int i;
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longestIndex = longestLen = -1;
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for (i = 0; i < fNumTokens; i++) {
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if (fTokenLen[i] <= len && fTokenLen[i] > longestLen &&
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strnicmp(str, fTokenPtr[i], fTokenLen[i]) == 0)
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{
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longestIndex = i;
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longestLen = fTokenLen[i];
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}
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}
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*pFoundLen = longestLen;
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return longestIndex;
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}
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/*
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* ==========================================================================
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* ImportBASDialog
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* ==========================================================================
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*/
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BEGIN_MESSAGE_MAP(ImportBASDialog, CDialog)
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ON_COMMAND(IDHELP, OnHelp)
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END_MESSAGE_MAP()
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BOOL ImportBASDialog::OnInitDialog(void)
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{
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CDialog::OnInitDialog(); // base class init
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PathName path(fFileName);
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CString fileNameOnly(path.GetFileName());
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CString ext(fileNameOnly.Right(4));
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if (ext.CompareNoCase(L".txt") == 0) {
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LOGI("removing extension from '%ls'", (LPCWSTR) fileNameOnly);
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fileNameOnly = fileNameOnly.Left(fileNameOnly.GetLength() - 4);
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}
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CEdit* pEdit = (CEdit*) GetDlgItem(IDC_IMPORT_BAS_SAVEAS);
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pEdit->SetWindowText(fileNameOnly);
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pEdit->SetSel(0, -1);
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pEdit->SetFocus();
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/*
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* Do the actual import. If it fails, disable the "save" button.
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*/
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if (!ImportBAS(fFileName)) {
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CButton* pButton = (CButton*) GetDlgItem(IDOK);
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pButton->EnableWindow(FALSE);
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pEdit->EnableWindow(FALSE);
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}
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return FALSE; // keep our focus
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}
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static const char kFailed[] = "failed.\r\n\r\n";
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static const char kSuccess[] = "success!\r\n\r\n";
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bool ImportBASDialog::ImportBAS(const WCHAR* fileName)
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{
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FILE* fp = NULL;
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ExpandBuffer msgs(1024);
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long fileLen, outLen, count;
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char* buf = NULL;
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char* outBuf = NULL;
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bool result = false;
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msgs.Printf("Importing from '%ls'...", fileName);
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fp = _wfopen(fileName, L"rb"); // EOL unknown, open as binary and deal
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if (fp == NULL) {
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msgs.Printf("%sUnable to open file.", kFailed);
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goto bail;
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}
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/* determine file length, and verify that it looks okay */
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fseek(fp, 0, SEEK_END);
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fileLen = ftell(fp);
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rewind(fp);
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if (ferror(fp) || fileLen < 0) {
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msgs.Printf("%sUnable to determine file length.", kFailed);
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goto bail;
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}
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if (fileLen == 0) {
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msgs.Printf("%sFile is empty.", kFailed);
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goto bail;
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}
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if (fileLen >= 128*1024) {
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msgs.Printf("%sFile is too large to be Applesoft.", kFailed);
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goto bail;
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}
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buf = new char[fileLen];
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if (buf == NULL) {
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msgs.Printf("%sUnable to allocate memory.", kFailed);
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goto bail;
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}
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/* read the entire thing into memory */
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count = fread(buf, 1, fileLen, fp);
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if (count != fileLen) {
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msgs.Printf("%sCould only read %ld of %ld bytes.", kFailed,
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count, fileLen);
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goto bail;
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}
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/* process it */
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if (!ConvertTextToBAS(buf, fileLen, &outBuf, &outLen, &msgs))
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goto bail;
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result = true;
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SetOutput(outBuf, outLen);
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bail:
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if (fp != NULL)
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fclose(fp);
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delete[] buf;
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/* copy our error messages out */
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CEdit* pEdit = (CEdit*) GetDlgItem(IDC_IMPORT_BAS_RESULTS);
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char* msgBuf = NULL;
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long msgLen;
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msgs.SeizeBuffer(&msgBuf, &msgLen);
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CString msgStr(msgBuf);
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pEdit->SetWindowText(msgStr);
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delete[] msgBuf;
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return result;
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}
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bool ImportBASDialog::ConvertTextToBAS(const char* buf, long fileLen,
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char** pOutBuf, long* pOutLen, ExpandBuffer* pMsgs)
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{
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ExpandBuffer output(32768);
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CString msg;
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const char* lineStart;
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const char* lineEnd;
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long textRemaining;
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int lineNum;
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fBASLookup.Init(ReformatApplesoft::GetApplesoftTokens(),
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ReformatApplesoft::kTokenCount, ReformatApplesoft::kTokenLen);
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lineEnd = buf;
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textRemaining = fileLen;
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lineNum = 0;
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while (textRemaining > 0) {
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lineNum++;
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lineStart = lineEnd;
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lineEnd = FindEOL(lineStart, textRemaining);
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if (!ProcessBASLine(lineStart, lineEnd - lineStart, &output,
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/*ref*/ msg))
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{
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pMsgs->Printf("%sLine %d: %ls", kFailed, lineNum, (LPCWSTR) msg);
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return false;
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}
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textRemaining -= lineEnd - lineStart;
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}
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/* output EOF marker */
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output.Putc(0x00);
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output.Putc(0x00);
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/* grab the buffer */
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char* outBuf;
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long outLen;
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output.SeizeBuffer(&outBuf, &outLen);
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if (outLen >= 0xc000) {
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pMsgs->Printf("%sOutput is too large to be valid", kFailed);
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delete[] outBuf;
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return false;
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}
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/* go back and fix up the "next line" pointers, assuming a $0801 start */
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if (!FixBASLinePointers(outBuf, outLen, 0x0801)) {
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pMsgs->Printf("%sFailed while fixing line pointers", kFailed);
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delete[] outBuf;
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return false;
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}
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*pOutBuf = outBuf;
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*pOutLen = outLen;
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pMsgs->Printf("%sProcessed %d lines", kSuccess, lineNum);
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pMsgs->Printf("\r\nTokenized file is %d bytes long", *pOutLen);
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return true;
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}
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/*
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From an Applesoft disassembly by Bob Sander-Cederlof:
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D56C- E8 1420 PARSE INX NEXT INPUT CHARACTER
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D56D- BD 00 02 1430 .1 LDA INPUT.BUFFER,X
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D570- 24 13 1440 BIT DATAFLG IN A "DATA" STATEMENT?
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D572- 70 04 1450 BVS .2 YES (DATAFLG = $49)
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D574- C9 20 1460 CMP #' ' IGNORE BLANKS
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D576- F0 F4 1470 BEQ PARSE
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D578- 85 0E 1480 .2 STA ENDCHR
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D57A- C9 22 1490 CMP #'" START OF QUOTATION?
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D57C- F0 74 1500 BEQ .13
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D57E- 70 4D 1510 BVS .9 BRANCH IF IN "DATA" STATEMENT
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D580- C9 3F 1520 CMP #'? SHORTHAND FOR "PRINT"?
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D582- D0 04 1530 BNE .3 NO
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D584- A9 BA 1540 LDA #TOKEN.PRINT YES, REPLACE WITH "PRINT" TOKEN
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D586- D0 45 1550 BNE .9 ...ALWAYS
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D588- C9 30 1560 .3 CMP #'0 IS IT A DIGIT, COLON, OR SEMI-COLON?
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D58A- 90 04 1570 BCC .4 NO, PUNCTUATION !"#$%&'()*+,-./
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D58C- C9 3C 1580 CMP #';'+1
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D58E- 90 3D 1590 BCC .9 YES, NOT A TOKEN
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1600 *--------------------------------
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1610 * SEARCH TOKEN NAME TABLE FOR MATCH STARTING
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1620 * WITH CURRENT CHAR FROM INPUT LINE
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1630 *--------------------------------
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D590- 84 AD 1640 .4 STY STRNG2 SAVE INDEX TO OUTPUT LINE
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D592- A9 D0 1650 LDA #TOKEN.NAME.TABLE-$100
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D594- 85 9D 1660 STA FAC MAKE PNTR FOR SEARCH
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D596- A9 CF 1670 LDA /TOKEN.NAME.TABLE-$100
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D598- 85 9E 1680 STA FAC+1
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D59A- A0 00 1690 LDY #0 USE Y-REG WITH (FAC) TO ADDRESS TABLE
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D59C- 84 0F 1700 STY TKN.CNTR HOLDS CURRENT TOKEN-$80
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D59E- 88 1710 DEY PREPARE FOR "INY" A FEW LINES DOWN
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D59F- 86 B8 1720 STX TXTPTR SAVE POSITION IN INPUT LINE
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D5A1- CA 1730 DEX PREPARE FOR "INX" A FEW LINES DOWN
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D5A2- C8 1740 .5 INY ADVANCE POINTER TO TOKEN TABLE
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D5A3- D0 02 1750 BNE .6 Y=Y+1 IS ENOUGH
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D5A5- E6 9E 1760 INC FAC+1 ALSO NEED TO BUMP THE PAGE
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D5A7- E8 1770 .6 INX ADVANCE POINTER TO INPUT LINE
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D5A8- BD 00 02 1780 .7 LDA INPUT.BUFFER,X NEXT CHAR FROM INPUT LINE
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D5AB- C9 20 1790 CMP #' ' THIS CHAR A BLANK?
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D5AD- F0 F8 1800 BEQ .6 YES, IGNORE ALL BLANKS
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D5AF- 38 1810 SEC NO, COMPARE TO CHAR IN TABLE
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D5B0- F1 9D 1820 SBC (FAC),Y SAME AS NEXT CHAR OF TOKEN NAME?
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D5B2- F0 EE 1830 BEQ .5 YES, CONTINUE MATCHING
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D5B4- C9 80 1840 CMP #$80 MAYBE; WAS IT SAME EXCEPT FOR BIT 7?
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D5B6- D0 41 1850 BNE .14 NO, SKIP TO NEXT TOKEN
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D5B8- 05 0F 1860 ORA TKN.CNTR YES, END OF TOKEN; GET TOKEN #
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D5BA- C9 C5 1870 CMP #TOKEN.AT DID WE MATCH "AT"?
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D5BC- D0 0D 1880 BNE .8 NO, SO NO AMBIGUITY
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D5BE- BD 01 02 1890 LDA INPUT.BUFFER+1,X "AT" COULD BE "ATN" OR "A TO"
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D5C1- C9 4E 1900 CMP #'N "ATN" HAS PRECEDENCE OVER "AT"
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D5C3- F0 34 1910 BEQ .14 IT IS "ATN", FIND IT THE HARD WAY
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D5C5- C9 4F 1920 CMP #'O "TO" HAS PRECEDENCE OVER "AT"
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D5C7- F0 30 1930 BEQ .14 IT IS "A TO", FIN IT THE HARD WAY
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D5C9- A9 C5 1940 LDA #TOKEN.AT NOT "ATN" OR "A TO", SO USE "AT"
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1950 *--------------------------------
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1960 * STORE CHARACTER OR TOKEN IN OUTPUT LINE
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1970 *--------------------------------
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Note the special handling for "AT" and "TO". When it examines the next
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character, it does NOT skip whitespace, making spaces significant when
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differentiating between "at n"/"atn" and "at o"/"ato".
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*/
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bool ImportBASDialog::ProcessBASLine(const char* buf, int len,
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ExpandBuffer* pOutput, CString& msg)
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{
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const int kMaxTokenLen = 7; // longest token; must also hold linenum
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const int kTokenAT = 0xc5 - 128;
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const int kTokenATN = 0xe1 - 128;
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char tokenBuf[kMaxTokenLen+1];
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bool gotOne = false;
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bool haveLineNum = false;
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char ch;
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int tokenLen;
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int lineNum;
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int foundToken;
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if (!len)
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return false;
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/*
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* Remove the CR, LF, or CRLF from the end of the line.
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*/
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if (len > 1 && buf[len-2] == '\r' && buf[len-1] == '\n') {
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//LOGI("removed CRLF");
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len -= 2;
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} else if (buf[len-1] == '\r') {
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//LOGI("removed CR");
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len--;
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} else if (buf[len-1] == '\n') {
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//LOGI("removed LF");
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len--;
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} else {
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//LOGI("no EOL marker found");
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}
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if (!len)
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return true; // blank lines are okay
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/*
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* Extract the line number.
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*/
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tokenLen = 0;
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while (len > 0) {
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if (!GetNextNWC(&buf, &len, &ch)) {
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if (!gotOne)
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return true; // blank lines with whitespace are okay
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else {
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// end of line reached while scanning line number is bad
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msg = L"found nothing except line number";
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return false;
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}
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}
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gotOne = true;
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if (!isdigit(ch))
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break;
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if (tokenLen == 5) { // theoretical max is "65535"
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msg = L"line number has too many digits";
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return false;
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}
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tokenBuf[tokenLen++] = ch;
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}
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if (!tokenLen) {
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msg = L"line did not start with a line number";
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return false;
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}
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tokenBuf[tokenLen] = '\0';
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lineNum = atoi(tokenBuf);
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LOGI("FOUND line %d", lineNum);
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pOutput->Putc((char) 0xcc); // placeholder
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pOutput->Putc((char) 0xcc);
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pOutput->Putc(lineNum & 0xff);
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pOutput->Putc((lineNum >> 8) & 0xff);
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/*
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* Start scanning tokens.
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*
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* We need to find the longest matching token (i.e. prefer "ONERR" over
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* "ON"). Grab a bunch of characters, ignoring whitespace, and scan
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* for a match.
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*/
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buf--; // back up
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len++;
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foundToken = -1;
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while (len > 0) {
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const char* dummy = buf;
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int remaining = len;
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/* load up the buffer */
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for (tokenLen = 0; tokenLen < kMaxTokenLen; tokenLen++) {
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if (!GetNextNWC(&dummy, &remaining, &ch))
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break;
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if (ch == '"')
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break;
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tokenBuf[tokenLen] = ch;
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}
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if (tokenLen == 0) {
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if (ch == '"') {
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/*
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* Note it's possible for strings to be unterminated. This
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* will go unnoticed by Applesoft if it's at the end of a
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* line.
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*/
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GetNextNWC(&buf, &len, &ch);
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pOutput->Putc(ch);
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while (len--) {
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ch = *buf++;
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pOutput->Putc(ch);
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if (ch == '"')
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break;
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}
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} else {
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/* end of line reached */
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break;
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}
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} else {
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int token, foundLen;
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token = fBASLookup.Lookup(tokenBuf, tokenLen, &foundLen);
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if (token >= 0) {
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/* match! */
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if (token == kTokenAT || token == kTokenATN) {
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/* have to go back and re-scan original */
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const char* tp = buf +1;
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while (toupper(*tp++) != 'T')
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;
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if (toupper(*tp) == 'N') {
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/* keep this token */
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assert(token == kTokenATN);
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} else if (toupper(*tp) == 'O') {
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/* eat and emit the 'A' so we get the "TO" instead */
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goto output_single;
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} else {
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if (token == kTokenATN) {
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/* reduce to "AT" */
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token = kTokenAT;
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foundLen--;
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}
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}
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}
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pOutput->Putc(token + 128);
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/* consume token chars, including whitespace */
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for (int j = 0; j < foundLen; j++)
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GetNextNWC(&buf, &len, &ch);
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//LOGI("TOKEN '%s' (%d)",
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// fBASLookup.GetToken(token), tokenLen);
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/* special handling for REM or DATA */
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if (token == 0xb2 - 128) {
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/* for a REM statement, copy verbatim to end of line */
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if (*buf == ' ') {
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/* eat one leading space, if present */
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buf++;
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len--;
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}
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while (len--) {
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ch = *buf++;
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pOutput->Putc(ch);
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}
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} else if (token == 0x83 - 128) {
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bool inQuote = false;
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/* for a DATA statement, copy until ':' */
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if (*buf == ' ') {
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/* eat one leading space */
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buf++;
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len--;
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}
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while (len--) {
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ch = *buf++;
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if (ch == '"') // ignore ':' in quoted strings
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inQuote = !inQuote;
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if (!inQuote && ch == ':') {
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len++;
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buf--;
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break;
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}
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pOutput->Putc(ch);
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}
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}
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} else {
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/*
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* Not a quote, and no token begins with this character.
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* Output it and advance.
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*/
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output_single:
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GetNextNWC(&buf, &len, &ch);
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pOutput->Putc(toupper(ch));
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}
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}
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}
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pOutput->Putc('\0');
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return true;
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}
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bool ImportBASDialog::FixBASLinePointers(char* buf, long len,
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uint16_t addr)
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{
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uint16_t val;
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char* start;
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while (len >= 4) {
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start = buf;
|
|
val = (*buf) & 0xff | (*(buf+1)) << 8;
|
|
|
|
if (val == 0)
|
|
break;
|
|
if (val != 0xcccc) {
|
|
LOGI("unexpected value 0x%04x found", val);
|
|
return false;
|
|
}
|
|
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
/*
|
|
* Find the next end-of-line marker.
|
|
*/
|
|
while (*buf != '\0' && len > 0) {
|
|
buf++;
|
|
len--;
|
|
}
|
|
if (!len) {
|
|
LOGI("ran off the end?");
|
|
return false;
|
|
}
|
|
buf++;
|
|
len--;
|
|
|
|
/*
|
|
* Set the value.
|
|
*/
|
|
val = (unsigned short) (buf - start);
|
|
ASSERT((int) val == buf - start);
|
|
addr += val;
|
|
|
|
*start = addr & 0xff;
|
|
*(start+1) = (addr >> 8) & 0xff;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
const char* ImportBASDialog::FindEOL(const char* buf, long max)
|
|
{
|
|
ASSERT(max >= 0);
|
|
if (max == 0)
|
|
return NULL;
|
|
|
|
while (max) {
|
|
if (*buf == '\r' || *buf == '\n') {
|
|
if (*buf == '\r' && max > 0 && *(buf+1) == '\n')
|
|
return buf+2;
|
|
return buf+1;
|
|
}
|
|
|
|
buf++;
|
|
max--;
|
|
}
|
|
|
|
/*
|
|
* Looks like the last line didn't have an EOL. That's okay.
|
|
*/
|
|
return buf;
|
|
}
|
|
|
|
bool ImportBASDialog::GetNextNWC(const char** pBuf, int* pLen, char* pCh)
|
|
{
|
|
static const char* kWhitespace = " \t\r\n";
|
|
|
|
while (*pLen > 0) {
|
|
const char* ptr;
|
|
char ch;
|
|
|
|
ch = **pBuf;
|
|
ptr = strchr(kWhitespace, ch);
|
|
(*pBuf)++;
|
|
(*pLen)--;
|
|
|
|
if (ptr == NULL) {
|
|
*pCh = ch;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void ImportBASDialog::OnOK(void)
|
|
{
|
|
CEdit* pEdit = (CEdit*) GetDlgItem(IDC_IMPORT_BAS_SAVEAS);
|
|
CString fileName;
|
|
|
|
pEdit->GetWindowText(fileName);
|
|
if (fileName.IsEmpty()) {
|
|
CString appName;
|
|
CheckedLoadString(&appName, IDS_MB_APP_NAME);
|
|
|
|
MessageBox(L"You must specify a filename.",
|
|
appName, MB_OK);
|
|
}
|
|
|
|
/*
|
|
* Write the file to the currently-open archive.
|
|
*/
|
|
GenericArchive::LocalFileDetails details;
|
|
|
|
details.SetEntryKind(GenericArchive::LocalFileDetails::kFileKindDataFork);
|
|
details.SetLocalPathName(L"Imported BASIC");
|
|
details.SetStrippedLocalPathName(fileName);
|
|
details.SetAccess(0xe3); // unlocked, backup bit set
|
|
details.SetFileType(kFileTypeBAS);
|
|
details.SetExtraType(0x0801);
|
|
details.SetStorageType(DiskFS::kStorageSeedling);
|
|
time_t now = time(NULL);
|
|
NuDateTime ndt;
|
|
GenericArchive::UNIXTimeToDateTime(&now, &ndt);
|
|
details.SetCreateWhen(ndt);
|
|
details.SetArchiveWhen(ndt);
|
|
details.SetModWhen(ndt);
|
|
|
|
CString errMsg;
|
|
|
|
fDirty = true;
|
|
if (!MainWindow::SaveToArchive(&details, (const unsigned char*) fOutput,
|
|
fOutputLen, NULL, -1, &errMsg, this))
|
|
{
|
|
goto bail;
|
|
}
|
|
|
|
/* success! close the dialog */
|
|
CDialog::OnOK();
|
|
|
|
bail:
|
|
if (!errMsg.IsEmpty()) {
|
|
CString msg;
|
|
msg.Format(L"Unable to import file: %ls.", (LPCWSTR) errMsg);
|
|
ShowFailureMsg(this, msg, IDS_FAILED);
|
|
return;
|
|
}
|
|
return;
|
|
}
|