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#include "slang-language-server-auto-format.h"
#include "../core/slang-char-util.h"
#include "../compiler-core/slang-lexer.h"
namespace Slang
{
String findClangFormatTool()
{
String processName = String("clang-format") + String(Process::getExecutableSuffix());
if (File::exists(processName))
return processName;
RefPtr<Process> proc;
CommandLine cmdLine;
cmdLine.setExecutableLocation(ExecutableLocation(processName));
if (Process::create(cmdLine, 0, proc) == SLANG_OK)
{
auto inStream = proc->getStream(StdStreamType::In);
if (inStream) inStream->close();
proc->kill(0);
return processName;
}
auto fileName =
Slang::SharedLibraryUtils::getSharedLibraryFileName((void*)slang_createGlobalSession);
auto dirName = Slang::Path::getParentDirectory(fileName);
auto localProcess = Path::combine(dirName, processName);
if (File::exists(localProcess))
return localProcess;
Index vsCodeLoc = dirName.indexOf(".vscode");
if (vsCodeLoc != -1)
{
// If we still cannot find clang-format, try to use the clang-format bundled with VSCode's C++ extension.
String vsCodeExtDir = dirName.subString(0, vsCodeLoc + 7);
vsCodeExtDir = Path::combine(vsCodeExtDir, "extensions");
struct CallbackContext
{
String foundPath;
String parentDir;
String processName;
} callbackContext;
callbackContext.processName = processName;
callbackContext.parentDir = vsCodeExtDir;
OSFileSystem::getExtSingleton()->enumeratePathContents(vsCodeExtDir.getBuffer(), [](SlangPathType /*pathType*/, const char* name, void* userData)
{
CallbackContext* context = (CallbackContext*)userData;
if (UnownedStringSlice(name).indexOf(UnownedStringSlice("ms-vscode.cpptools-")) != -1)
{
String candidateFileName = Path::combine(Path::combine(context->parentDir, name, "LLVM"), "bin", context->processName);
if (File::exists(candidateFileName))
context->foundPath = candidateFileName;
}
}, & callbackContext);
if (callbackContext.foundPath.getLength())
return callbackContext.foundPath;
}
return String();
}
void translateXmlEscape(StringBuilder& sb, UnownedStringSlice text)
{
if (text.getLength() == 0)
return;
if (text[0] == '#')
{
Int charVal = 0;
StringUtil::parseInt(text.tail(1), charVal);
if (charVal != 0)
sb.appendChar((char)charVal);
}
else if (text == "lt")
{
sb.appendChar('<');
}
else if (text == "gt")
{
sb.appendChar('>');
}
else if (text == "amp")
{
sb.appendChar('&');
}
else if (text == "apos")
{
sb.appendChar('\'');
}
else if (text == "quot")
{
sb.appendChar('\"');
}
}
String parseXmlText(UnownedStringSlice text)
{
StringBuilder sb;
Index pos = 0;
for (; pos < text.getLength();)
{
if (text[pos] == '&')
{
pos++;
Index endPos = pos;
while (endPos < text.getLength() && text[endPos] != ';')
endPos++;
auto escapedToken = text.subString(pos, endPos - pos);
pos = endPos + 1;
translateXmlEscape(sb, escapedToken);
}
else
{
sb.appendChar(text[pos]);
pos++;
}
}
return sb.ProduceString();
}
List<Edit> formatSource(UnownedStringSlice text, Index lineStart, Index lineEnd, Index cursorOffset, const FormatOptions& options)
{
List<Edit> edits;
String clangProcessName = options.clangFormatLocation;
CommandLine cmdLine;
cmdLine.setExecutableLocation(ExecutableLocation(clangProcessName));
cmdLine.addArg("--assume-filename=source.cs");
if (cursorOffset != -1)
{
cmdLine.addArg("--cursor=" + String(cursorOffset));
}
if (lineStart != -1)
{
cmdLine.addArg("--lines=" + String(lineStart) + ":" + String(lineEnd + 1));
}
cmdLine.addArg("--output-replacements-xml");
if (options.style.getLength())
{
cmdLine.addArg("-style");
cmdLine.addArg(options.style);
}
RefPtr<Process> proc;
if (SLANG_FAILED(Process::create(cmdLine, 0, proc)))
return edits;
auto inStream = proc->getStream(StdStreamType::In);
inStream->write(text.begin(), text.getLength());
char terminator = '\0';
inStream->write(&terminator, 1);
inStream->flush();
inStream->close();
ExecuteResult result;
ProcessUtil::readUntilTermination(proc, result);
/*
Example result of clang-format:
<?xml version='1.0'?>
<replacements xml:space='preserve' incomplete_format='false'>
<replacement offset='26' length='2'> </replacement>
</replacements>
*/
// Adhoc parsing of clang-format's result.
List<UnownedStringSlice> lines;
auto offsetStr = UnownedStringSlice("offset=");
auto lengthStr = UnownedStringSlice("length=");
auto endStr = UnownedStringSlice("</replacement>");
auto replacementStr = UnownedStringSlice("<replacement ");
StringUtil::calcLines(result.standardOutput.getUnownedSlice(), lines);
for (auto line : lines)
{
line = line.trim();
if (!line.startsWith(replacementStr))
continue;
line = line.tail(replacementStr.getLength());
Index pos = line.indexOf(offsetStr);
if (pos == -1)
continue;
pos += offsetStr.getLength();
if (pos < line.getLength() && line[pos] == '\'')
pos++;
Edit edt;
edt.offset = StringUtil::parseIntAndAdvancePos(line, pos);
pos = line.indexOf(lengthStr);
if (pos == -1)
continue;
pos += lengthStr.getLength();
if (pos < line.getLength() && line[pos] == '\'')
pos++;
edt.length = StringUtil::parseIntAndAdvancePos(line, pos);
line = line.tail(pos);
pos = line.indexOf('>');
if (pos == -1)
continue;
line = line.tail(pos + 1);
Index endPos = line.indexOf(endStr);
if (endPos == -1)
continue;
line = line.head(endPos);
edt.text = parseXmlText(line);
// For on-type formatting, don't make any changes beyond the current cursor position.
if (cursorOffset != -1 && edt.offset >= cursorOffset)
break;
// Never allow clang-format to put the semicolon after `}` in its own line.
if (edt.offset < text.getLength() && edt.length == 0 && text[edt.offset] == ';' && edt.offset >0 && text[edt.offset - 1] == '}')
continue;
edits.add(edt);
}
return edits;
}
} // namespace Slang
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