1 files changed, 116 insertions, 0 deletions
diff --git a/Minecraft.Server/Console/ServerCliParser.cpp b/Minecraft.Server/Console/ServerCliParser.cpp
new file mode 100644
index 00000000..5888153f
--- /dev/null
+++ b/Minecraft.Server/Console/ServerCliParser.cpp
@@ -0,0 +1,116 @@
+#include "stdafx.h"
+
+#include "ServerCliParser.h"
+
+namespace ServerRuntime
+{
+	static void TokenizeLine(const std::string &line, std::vector<std::string> *tokens, bool *trailingSpace)
+	{
+		std::string current;
+		bool inQuotes = false;
+		bool escaped = false;
+
+		tokens->clear();
+		*trailingSpace = false;
+
+		for (size_t i = 0; i < line.size(); ++i)
+		{
+			char ch = line[i];
+			if (escaped)
+			{
+				// Keep escaped character literally (e.g. \" or \ ).
+				current.push_back(ch);
+				escaped = false;
+				continue;
+			}
+
+			if (ch == '\\')
+			{
+				escaped = true;
+				continue;
+			}
+
+			if (ch == '"')
+			{
+				// Double quotes group spaces into one token.
+				inQuotes = !inQuotes;
+				continue;
+			}
+
+			if (!inQuotes && (ch == ' ' || ch == '\t'))
+			{
+				if (!current.empty())
+				{
+					tokens->push_back(current);
+					current.clear();
+				}
+				continue;
+			}
+
+			current.push_back(ch);
+		}
+
+		if (!current.empty())
+		{
+			tokens->push_back(current);
+		}
+
+		if (!line.empty())
+		{
+			char tail = line[line.size() - 1];
+			// Trailing space means completion targets the next token slot.
+			*trailingSpace = (!inQuotes && (tail == ' ' || tail == '\t'));
+		}
+	}
+
+	ServerCliParsedLine ServerCliParser::Parse(const std::string &line)
+	{
+		ServerCliParsedLine parsed;
+		parsed.raw = line;
+		TokenizeLine(line, &parsed.tokens, &parsed.trailingSpace);
+		return parsed;
+	}
+
+	ServerCliCompletionContext ServerCliParser::BuildCompletionContext(const std::string &line)
+	{
+		ServerCliCompletionContext context;
+		context.parsed = Parse(line);
+
+		if (context.parsed.tokens.empty())
+		{
+			context.currentTokenIndex = 0;
+			context.prefix.clear();
+			context.linePrefix.clear();
+			return context;
+		}
+
+		if (context.parsed.trailingSpace)
+		{
+			// Cursor is after a separator, so complete a new token.
+			context.currentTokenIndex = context.parsed.tokens.size();
+			context.prefix.clear();
+		}
+		else
+		{
+			// Cursor is inside current token, so complete by its prefix.
+			context.currentTokenIndex = context.parsed.tokens.size() - 1;
+			context.prefix = context.parsed.tokens.back();
+		}
+
+		for (size_t i = 0; i < context.currentTokenIndex; ++i)
+		{
+			// linePrefix is the immutable left side reused by completion output.
+			if (!context.linePrefix.empty())
+			{
+				context.linePrefix.push_back(' ');
+			}
+			context.linePrefix += context.parsed.tokens[i];
+		}
+		if (!context.linePrefix.empty())
+		{
+			context.linePrefix.push_back(' ');
+		}
+
+		return context;
+	}
+}