SourceLoc use in command line processing (#1848)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Added SourceLoc handling for command line parsing.

* Fix typo in debug.

* Fix issue around the DiagnosticSink used in options parsing not having a writer available - by having DiagnosticSink parenting.

* Small rename for clarity.

Co-authored-by: T. Foley <tfoleyNV@users.noreply.github.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/source/compiler-core/slang-command-line-args.cpp b/source/compiler-core/slang-command-line-args.cpp
new file mode 100644
index 000000000..da262e9bb
--- /dev/null
+++ b/source/compiler-core/slang-command-line-args.cpp
@@ -0,0 +1,95 @@
+#include "slang-command-line-args.h"
+
+#include "../core/slang-process-util.h"
+#include "../core/slang-string-escape-util.h"
+
+#include "slang-core-diagnostics.h"
+
+namespace Slang {
+
+void CommandLineArgs::setArgs(const char*const* args, size_t argCount)
+{
+    m_args.clear();
+
+    const SourceLoc startLoc = m_sourceManager->getNextRangeStart();
+
+    StringBuilder buf;
+   
+    auto escapeHandler = ProcessUtil::getEscapeHandler();
+
+    for (size_t i = 0; i < argCount; ++i)
+    {
+        const Index offset = buf.getLength();
+
+        const char* srcArg = args[i];
+
+        Arg dstArg;
+        dstArg.loc = startLoc + offset;
+        dstArg.value = srcArg;
+
+        m_args.add(dstArg);
+
+        // Write the string escaped if necessary
+        StringEscapeUtil::appendMaybeQuoted(escapeHandler, dstArg.value.getUnownedSlice(), buf);
+
+        // Put a space between the args
+        buf << " ";
+    }
+
+    SourceFile* sourceFile = m_sourceManager->createSourceFileWithString(PathInfo::makeUnknown(), buf.ProduceString());
+    m_sourceView = m_sourceManager->createSourceView(sourceFile, nullptr, SourceLoc::fromRaw(0));
+
+    SLANG_ASSERT(m_sourceView->getRange().begin == startLoc);
+}
+
+/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+                         CommandLineReader
+
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! */
+
+String CommandLineReader::getPreviousValue() const
+{
+    SLANG_ASSERT(m_index > 0);
+    if (m_index > 0)
+    {
+        const auto& prevArg = (*m_args)[m_index - 1];
+        return prevArg.value;
+    }
+    else
+    {
+        return String();
+    }
+}
+
+SlangResult CommandLineReader::expectArg(String& outArg)
+{
+    if (hasArg())
+    {
+        outArg = m_args->m_args[m_index++].value;
+        return SLANG_OK;
+    }
+    else
+    {
+        m_sink->diagnose(peekLoc(), MiscDiagnostics::expectedArgumentForOption, getPreviousValue());
+        return SLANG_FAIL;
+    }
+}
+
+SlangResult CommandLineReader::expectArg(CommandLineArg& outArg)
+{
+    if (hasArg())
+    {
+        outArg = peekArg();
+        advance();
+        return SLANG_OK;
+    }
+    else
+    {
+        m_sink->diagnose(peekLoc(), MiscDiagnostics::expectedArgumentForOption, getPreviousValue());
+        return SLANG_FAIL;
+    }
+}
+
+
+} // namespace Slang