internal/core/adt: add logging utilities for debugging
Change-Id: I5983a0b0758785a08674aa5a42ec636ef16bd347
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/8044
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/internal/core/adt/context.go b/internal/core/adt/context.go
index 8da752a..3f8f792 100644
--- a/internal/core/adt/context.go
+++ b/internal/core/adt/context.go
@@ -16,6 +16,7 @@
import (
"fmt"
+ "log"
"os"
"reflect"
"regexp"
@@ -34,6 +35,11 @@
// false otherwise.
var Debug bool = os.Getenv("CUE_DEBUG") != "0"
+// Verbosity sets the log level. There are currently only two levels:
+// 0: no logging
+// 1: logging
+var Verbosity int
+
// Assert panics if the condition is false. Assert can be used to check for
// conditions that are considers to break an internal variant or unexpected
// condition, but that nonetheless probably will be handled correctly down the
@@ -59,6 +65,43 @@
}
}
+func init() {
+ log.SetFlags(log.Lshortfile)
+}
+
+func Logf(format string, args ...interface{}) {
+ if Verbosity == 0 {
+ return
+ }
+ s := fmt.Sprintf(format, args...)
+ _ = log.Output(2, s)
+}
+
+var pMap = map[*Vertex]int{}
+
+func (c *OpContext) Logf(v *Vertex, format string, args ...interface{}) {
+ if Verbosity == 0 {
+ return
+ }
+ p := pMap[v]
+ if p == 0 {
+ p = len(pMap) + 1
+ pMap[v] = p
+ }
+ a := append([]interface{}{
+ p,
+ v.Label.SelectorString(c),
+ v.Path(),
+ }, args...)
+ for i := 2; i < len(a); i++ {
+ if n, ok := a[i].(Node); ok {
+ a[i] = c.Str(n)
+ }
+ }
+ s := fmt.Sprintf(" [%d] %s/%v"+format, a...)
+ _ = log.Output(2, s)
+}
+
// A Unifier implements a strategy for CUE's unification operation. It must
// handle the following aspects of CUE evaluation:
//
diff --git a/internal/core/eval/eval_test.go b/internal/core/eval/eval_test.go
index a167a2c..8d1d225 100644
--- a/internal/core/eval/eval_test.go
+++ b/internal/core/eval/eval_test.go
@@ -23,6 +23,7 @@
"github.com/rogpeppe/go-internal/txtar"
"cuelang.org/go/cue"
+ "cuelang.org/go/internal/core/adt"
"cuelang.org/go/internal/core/debug"
"cuelang.org/go/internal/core/eval"
"cuelang.org/go/internal/core/validate"
@@ -120,9 +121,11 @@
// t.Error(debug.NodeString(r, v, nil))
// eval.Debug = true
+ adt.Verbosity = 1
e := eval.New(r)
ctx := e.NewContext(v)
v.Finalize(ctx)
+ adt.Verbosity = 0
t.Error(debug.NodeString(r, v, nil))
