Merge branch 'add-cpp-conantxt-config-file-class' into 'master'

Add config file class for C++ Conan `conanfile.txt`

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/165260



Merged-by: Dzmitry (Dima) Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Approved-by: Missy Davies <mdavies@gitlab.com>
Approved-by: Dzmitry (Dima) Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Reviewed-by: Dzmitry (Dima) Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Co-authored-by: lma-git <lma@gitlab.com>

ee/lib/ai/context/dependencies/config_files/constants.rb

@@ -9,7 +9,9 @@ module Constants
           # should always appear first before non-lock files. This ordering affects
           # the result of ConfigFileParser#find_config_file_paths_with_class.
           CONFIG_FILE_CLASSES = [
+            ConfigFiles::CppConanTxt,
             ConfigFiles::GoModules,
+            ConfigFiles::JavaGradle,
             ConfigFiles::JavaMaven,
             ConfigFiles::RubyGemsLock
           ].freeze

ee/lib/ai/context/dependencies/config_files/cpp_conan_txt.rb

+# frozen_string_literal: true
+
+module Ai
+  module Context
+    module Dependencies
+      module ConfigFiles
+        class CppConanTxt < Base
+          START_SECTION_REGEX = /^\[requires\]/ # Identifies the dependencies section
+          START_NEXT_SECTION_REGEX = /^\[/
+          COMMENT_ONLY_REGEX = /^#/
+
+          def self.file_name_glob
+            'conanfile.txt'
+          end
+
+          def self.lang_name
+            'C++'
+          end
+
+          private
+
+          ### Example format:
+          #
+          # [requires]
+          # libiconv/1.17
+          # openssl/3.2.2u # An inline comment
+          # poco/[>1.0,<1.9]
+          # # A comment-only line
+          # zlib/1.2.13#revision1
+          # boost/1.67.0@conan/stable
+          #
+          def extract_libs
+            libs = []
+            in_deps_section = false
+
+            content.each_line do |line|
+              line.strip!
+              next unless line.present?
+
+              if START_SECTION_REGEX.match?(line)
+                in_deps_section = true
+              elsif in_deps_section && START_NEXT_SECTION_REGEX.match?(line)
+                break
+              elsif in_deps_section && !COMMENT_ONLY_REGEX.match?(line)
+                libs << parse_lib(line)
+              end
+            end
+
+            libs
+          end
+
+          def parse_lib(line)
+            name_version, _ = line.split(/@|#/)
+            name, version = name_version.split('/')
+            version&.gsub!(/\[|\]/, '') # Version could be a range, e.g. [>1.0,<1.9]
+
+            Lib.new(name: name, version: version)
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/lib/ai/context/dependencies/config_files/cpp_conan_txt_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ai::Context::Dependencies::ConfigFiles::CppConanTxt, feature_category: :code_suggestions do
+  it 'returns the expected language value' do
+    expect(described_class.lang).to eq('cpp')
+  end
+
+  it_behaves_like 'parsing a valid dependency config file' do
+    let(:config_file_content) do
+      <<~CONTENT
+        [requires]
+        libiconv/1.17
+        openssl/3.2.2u # An inline comment
+        poco/[>1.0,<1.9]
+        # A comment-only line
+        zlib/1.2.13#revision1
+        boost/1.67.0@conan/stable
+
+        [generators]
+        cmake_find_package_multi
+
+        [options]
+        pkg/openssl:shared=False
+      CONTENT
+    end
+
+    let(:expected_formatted_lib_names) do
+      [
+        'libiconv (1.17)',
+        'openssl (3.2.2u)',
+        'poco (>1.0,<1.9)',
+        'zlib (1.2.13)',
+        'boost (1.67.0)'
+      ]
+    end
+  end
+
+  it_behaves_like 'parsing an invalid dependency config file'
+
+  describe '.matches?' do
+    using RSpec::Parameterized::TableSyntax
+
+    where(:path, :matches) do
+      'conanfile.txt'            | true
+      'dir/conanfile.txt'        | true
+      'dir/subdir/conanfile.txt' | true
+      'dir/conanfile'            | false
+      'xconanfile.txt'           | false
+      'Conanfile.txt'            | false
+      'conanfile_txt'            | false
+      'conanfile'                | false
+    end
+
+    with_them do
+      it 'matches the file name glob pattern at various directory levels' do
+        expect(described_class.matches?(path)).to eq(matches)
+      end
+    end
+  end
+end