From 8d4967d3a187dd66cf14b070a9db63f8ea21b21f Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <julian.klode@canonical.com>
Date: Tue, 28 Jan 2020 21:46:10 +0100
Subject: patterns: Implement unary !

---
 apt-pkg/cachefilter-patterns.cc | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

(limited to 'apt-pkg/cachefilter-patterns.cc')

diff --git a/apt-pkg/cachefilter-patterns.cc b/apt-pkg/cachefilter-patterns.cc
index 11ad5d723..9fab0281d 100644
--- a/apt-pkg/cachefilter-patterns.cc
+++ b/apt-pkg/cachefilter-patterns.cc
@@ -66,6 +66,32 @@ std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parseTop()
 
 // Parse any pattern
 std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parse()
+{
+   return parseUnary();
+}
+
+std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parseUnary()
+{
+
+   if (sentence[state.offset] != '!')
+      return parsePrimary();
+
+   auto start = ++state.offset;
+   auto primary = parsePrimary();
+
+   if (primary == nullptr)
+      throw Error{Node{start, sentence.size()}, "Expected pattern"};
+
+   auto node = std::make_unique<PatternNode>();
+   node->start = start;
+   node->end = primary->end;
+   node->term = "?not";
+   node->arguments.push_back(std::move(primary));
+   node->haveArgumentList = true;
+   return node;
+}
+
+std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parsePrimary()
 {
    std::unique_ptr<Node> node;
    if ((node = parseShortPattern()) != nullptr)
@@ -198,7 +224,7 @@ std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parseQuotedWord()
 // Parse a bare word atom
 std::unique_ptr<PatternTreeParser::Node> PatternTreeParser::parseWord()
 {
-   static const constexpr auto DISALLOWED_START = "?~,()\0"_sv;
+   static const constexpr auto DISALLOWED_START = "!?~,()\0"_sv;
    static const constexpr auto DISALLOWED = ",()\0"_sv;
    if (DISALLOWED_START.find(sentence[state.offset]) != APT::StringView::npos)
       return nullptr;
-- 
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