chore: import upstream snapshot with attribution

internal/parser/languages/cmake.go

@@ -0,0 +1,113 @@
+package languages
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/zzet/gortex/internal/graph"
+	"github.com/zzet/gortex/internal/parser"
+)
+
+// CMake is command-call-structured. `function(NAME ...)` /
+// `macro(NAME ...)` introduce callable blocks terminated by
+// `endfunction()` / `endmacro()`; `add_library` / `add_executable`
+// declare build targets (modelled as function nodes); `set(NAME ...)`
+// declares variables; `include(...)` and `add_subdirectory(...)`
+// are imports.
+var (
+	cmakeFunctionRe      = regexp.MustCompile(`(?mi)^\s*function\s*\(\s*([A-Za-z_][\w-]*)`)
+	cmakeMacroRe         = regexp.MustCompile(`(?mi)^\s*macro\s*\(\s*([A-Za-z_][\w-]*)`)
+	cmakeIncludeRe       = regexp.MustCompile(`(?mi)^\s*include\s*\(\s*([^)\s]+)`)
+	cmakeAddSubdirRe     = regexp.MustCompile(`(?mi)^\s*add_subdirectory\s*\(\s*([^)\s]+)`)
+	cmakeSetRe           = regexp.MustCompile(`(?mi)^\s*set\s*\(\s*([A-Za-z_][\w]*)`)
+	cmakeAddLibraryRe    = regexp.MustCompile(`(?mi)^\s*add_library\s*\(\s*([A-Za-z_][\w-]*)`)
+	cmakeAddExecutableRe = regexp.MustCompile(`(?mi)^\s*add_executable\s*\(\s*([A-Za-z_][\w-]*)`)
+)
+
+// CMakeExtractor extracts CMake source using regex.
+type CMakeExtractor struct{}
+
+func NewCMakeExtractor() *CMakeExtractor { return &CMakeExtractor{} }
+
+func (e *CMakeExtractor) Language() string     { return "cmake" }
+func (e *CMakeExtractor) Extensions() []string { return []string{".cmake", "CMakeLists.txt"} }
+
+func (e *CMakeExtractor) Extract(filePath string, src []byte) (*parser.ExtractionResult, error) {
+	lines := strings.Split(string(src), "\n")
+	result := &parser.ExtractionResult{}
+
+	fileNode := &graph.Node{
+		ID: filePath, Kind: graph.KindFile, Name: filePath,
+		FilePath: filePath, StartLine: 1, EndLine: len(lines),
+		Language: "cmake",
+	}
+	result.Nodes = append(result.Nodes, fileNode)
+
+	seen := make(map[string]bool)
+	add := func(name string, kind graph.NodeKind, start, end int) {
+		if name == "" {
+			return
+		}
+		id := filePath + "::" + name
+		if seen[id] {
+			return
+		}
+		seen[id] = true
+		result.Nodes = append(result.Nodes, &graph.Node{
+			ID: id, Kind: kind, Name: name,
+			FilePath: filePath, StartLine: start, EndLine: end,
+			Language: "cmake",
+		})
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: id, Kind: graph.EdgeDefines,
+			FilePath: filePath, Line: start,
+		})
+	}
+
+	for _, m := range cmakeFunctionRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, findKeywordBlockEnd(lines, line, "endfunction"))
+	}
+	for _, m := range cmakeMacroRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, findKeywordBlockEnd(lines, line, "endmacro"))
+	}
+	for _, m := range cmakeAddLibraryRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, line)
+	}
+	for _, m := range cmakeAddExecutableRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindFunction, line, line)
+	}
+	for _, m := range cmakeSetRe.FindAllSubmatchIndex(src, -1) {
+		name := string(src[m[2]:m[3]])
+		line := lineAt(src, m[0])
+		add(name, graph.KindVariable, line, line)
+	}
+
+	for _, m := range cmakeIncludeRe.FindAllSubmatchIndex(src, -1) {
+		mod := strings.Trim(string(src[m[2]:m[3]]), `"`)
+		line := lineAt(src, m[0])
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: "unresolved::import::" + mod,
+			Kind: graph.EdgeImports, FilePath: filePath, Line: line,
+		})
+	}
+	for _, m := range cmakeAddSubdirRe.FindAllSubmatchIndex(src, -1) {
+		mod := strings.Trim(string(src[m[2]:m[3]]), `"`)
+		line := lineAt(src, m[0])
+		result.Edges = append(result.Edges, &graph.Edge{
+			From: fileNode.ID, To: "unresolved::import::" + mod,
+			Kind: graph.EdgeImports, FilePath: filePath, Line: line,
+		})
+	}
+
+	return result, nil
+}
+
+var _ parser.Extractor = (*CMakeExtractor)(nil)