Initial QSfera import

Server/vendor/github.com/antithesishq/antithesis-sdk-go/assert/location.go

@@ -0,0 +1,58 @@
+//go:build enable_antithesis_sdk
+
+package assert
+
+import (
+	"path"
+	"runtime"
+	"strings"
+)
+
+// stackFrameOffset indicates how many frames to go up in the
+// call stack to find the filename/location/line info.  As
+// this work is always done in NewLocationInfo(), the offset is
+// specified from the perspective of NewLocationInfo
+type stackFrameOffset int
+
+// Order is important here since iota is being used
+const (
+	offsetNewLocationInfo stackFrameOffset = iota
+	offsetHere
+	offsetAPICaller
+	offsetAPICallersCaller
+)
+
+// locationInfo represents the attributes known at instrumentation time
+// for each Antithesis assertion discovered
+type locationInfo struct {
+	Classname string `json:"class"`
+	Funcname  string `json:"function"`
+	Filename  string `json:"file"`
+	Line      int    `json:"begin_line"`
+	Column    int    `json:"begin_column"`
+}
+
+// columnUnknown is used when the column associated with
+// a locationInfo is not available
+const columnUnknown = 0
+
+// NewLocationInfo creates a locationInfo directly from
+// the current execution context
+func newLocationInfo(nframes stackFrameOffset) *locationInfo {
+	// Get location info and add to details
+	funcname := "*function*"
+	classname := "*class*"
+	pc, filename, line, ok := runtime.Caller(int(nframes))
+	if !ok {
+		filename = "*file*"
+		line = 0
+	} else {
+		if this_func := runtime.FuncForPC(pc); this_func != nil {
+			fullname := this_func.Name()
+			funcname = path.Ext(fullname)
+			classname, _ = strings.CutSuffix(fullname, funcname)
+			funcname = funcname[1:]
+		}
+	}
+	return &locationInfo{classname, funcname, filename, line, columnUnknown}
+}