From 247a6cec90004b8666d155eacc0f27d3a6c8fcf9 Mon Sep 17 00:00:00 2001
From: Robert Schumacher <roschuma@microsoft.com>
Date: Thu, 8 Jun 2017 00:36:17 -0700
Subject: [vcpkg] Improve diagnostics upon port load failure

---
 toolsrc/include/Paragraphs.h      |  8 ++++++++
 toolsrc/include/SourceParagraph.h |  9 ++++++---
 toolsrc/include/Span.h            | 38 ++++++++++++++++++++++++++++++++++++++
 toolsrc/include/pch.h             |  1 +
 toolsrc/include/vcpkg_Strings.h   | 15 ++++++++-------
 5 files changed, 61 insertions(+), 10 deletions(-)
 create mode 100644 toolsrc/include/Span.h

(limited to 'toolsrc/include')

diff --git a/toolsrc/include/Paragraphs.h b/toolsrc/include/Paragraphs.h
index 59f0eefc8..04f9fb879 100644
--- a/toolsrc/include/Paragraphs.h
+++ b/toolsrc/include/Paragraphs.h
@@ -21,6 +21,14 @@ namespace vcpkg::Paragraphs
 
     Expected<BinaryParagraph> try_load_cached_package(const VcpkgPaths& paths, const PackageSpec& spec);
 
+    struct LoadResults
+    {
+        std::vector<SourceParagraph> paragraphs;
+        std::vector<ParseControlErrorInfo> errors;
+    };
+
+    LoadResults try_load_all_ports(const Files::Filesystem& fs, const fs::path& ports_dir);
+
     std::vector<SourceParagraph> load_all_ports(const Files::Filesystem& fs, const fs::path& ports_dir);
 
     std::map<std::string, VersionT> extract_port_names_and_versions(
diff --git a/toolsrc/include/SourceParagraph.h b/toolsrc/include/SourceParagraph.h
index a53158f3f..47ad5b830 100644
--- a/toolsrc/include/SourceParagraph.h
+++ b/toolsrc/include/SourceParagraph.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Span.h"
 #include "vcpkg_System.h"
 #include "vcpkg_expected.h"
 
@@ -23,7 +24,6 @@ namespace vcpkg
     {
         std::string name;
         std::string remaining_fields_as_string;
-        std::string valid_fields_as_string;
         std::error_code error;
     };
 
@@ -45,8 +45,11 @@ namespace vcpkg
         std::vector<Dependency> depends;
     };
 
-    void print_error_message(const ParseControlErrorInfo& info);
-    void print_error_message(std::vector<ParseControlErrorInfo> error_info_list);
+    void print_error_message(span<const ParseControlErrorInfo> error_info_list);
+    inline void print_error_message(const ParseControlErrorInfo& error_info_list)
+    {
+        return print_error_message({&error_info_list, 1});
+    }
 
     std::vector<std::string> filter_dependencies(const std::vector<Dependency>& deps, const Triplet& t);
 
diff --git a/toolsrc/include/Span.h b/toolsrc/include/Span.h
new file mode 100644
index 000000000..b16af2cef
--- /dev/null
+++ b/toolsrc/include/Span.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <vector>
+
+template<class T>
+struct span
+{
+public:
+    using element_type = T;
+    using pointer = T*;
+    using reference = T&;
+    using iterator = T*;
+
+    constexpr span() noexcept : m_ptr(nullptr), m_count(0) {}
+    constexpr span(std::nullptr_t) noexcept : span() {}
+    constexpr span(T* ptr, size_t count) noexcept : m_ptr(ptr), m_count(count) {}
+    constexpr span(T* ptr_begin, T* ptr_end) noexcept : m_ptr(ptr_begin), m_count(ptr_end - ptr_begin) {}
+
+    template<size_t N>
+    constexpr span(T (&arr)[N]) noexcept : span(arr, N)
+    {
+    }
+
+    span(std::vector<T>& v) noexcept : span(v.data(), v.size()) {}
+    span(const std::vector<std::remove_const_t<T>>& v) noexcept : span(v.data(), v.size()) {}
+
+    constexpr iterator begin() const { return m_ptr; }
+    constexpr iterator end() const { return m_ptr + m_count; }
+
+    constexpr reference operator[](size_t i) const { return m_ptr[i]; }
+    constexpr size_t size() const { return m_count; }
+
+private:
+    pointer m_ptr;
+    size_t m_count;
+};
diff --git a/toolsrc/include/pch.h b/toolsrc/include/pch.h
index c58c30ea3..406d0741e 100644
--- a/toolsrc/include/pch.h
+++ b/toolsrc/include/pch.h
@@ -12,6 +12,7 @@
 #include <chrono>
 #include <codecvt>
 #include <cstdarg>
+#include <cstddef>
 #include <cstdint>
 #include <filesystem>
 #include <fstream>
diff --git a/toolsrc/include/vcpkg_Strings.h b/toolsrc/include/vcpkg_Strings.h
index 3f8f4562e..cab8071aa 100644
--- a/toolsrc/include/vcpkg_Strings.h
+++ b/toolsrc/include/vcpkg_Strings.h
@@ -58,8 +58,8 @@ namespace vcpkg::Strings
 
     std::string ascii_to_lowercase(const std::string& input);
 
-    template<class T, class Transformer, class CharType>
-    std::basic_string<CharType> join(const CharType* delimiter, const std::vector<T>& v, Transformer transformer)
+    template<class Container, class Transformer, class CharType>
+    std::basic_string<CharType> join(const CharType* delimiter, const Container& v, Transformer transformer)
     {
         if (v.empty())
         {
@@ -69,20 +69,21 @@ namespace vcpkg::Strings
         std::basic_string<CharType> output;
         size_t size = v.size();
 
-        output.append(transformer(v.at(0)));
+        output.append(transformer(v[0]));
 
         for (size_t i = 1; i < size; ++i)
         {
             output.append(delimiter);
-            output.append(transformer(v.at(i)));
+            output.append(transformer(v[i]));
         }
 
         return output;
     }
-    template<class T, class CharType>
-    std::basic_string<CharType> join(const CharType* delimiter, const std::vector<T>& v)
+    template<class Container, class CharType>
+    std::basic_string<CharType> join(const CharType* delimiter, const Container& v)
     {
-        return join(delimiter, v, [](const T& x) -> const T& { return x; });
+        using Element = decltype(v[0]);
+        return join(delimiter, v, [](const Element& x) -> const Element& { return x; });
     }
 
     void trim(std::string* s);
-- 
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