From d40c4dfcd94d86a176d76ff6923ec45597674569 Mon Sep 17 00:00:00 2001
From: starainrt <i@b612.me>
Date: Sun, 17 May 2026 21:19:23 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E5=85=BC=E5=AE=B9=20TinyGo=20wasm=20?=
 =?UTF-8?q?=E7=BC=96=E8=AF=91=E8=A1=8C=E6=98=9F=E6=98=9F=E5=8E=86=E5=88=9D?=
 =?UTF-8?q?=E5=A7=8B=E5=8C=96?=
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- 将 planetViews 从包级初始化改为 sync.Once 懒加载，避免 TinyGo interp 在编译期处理大型 float64 表切片索引时触发 unsupported fcmp
- 将行星视图构建失败改为内部返回 error，并由兼容层统一 panic
- 补充无效行星数据切片边界测试
---
 planet/planet.go      |  2 +-
 planet/planet_test.go | 15 ++++++++++++++-
 planet/view.go        | 29 +++++++++++++++++++++++------
 3 files changed, 38 insertions(+), 8 deletions(-)

diff --git a/planet/planet.go b/planet/planet.go
index 03a9e6f..bda41af 100644
--- a/planet/planet.go
+++ b/planet/planet.go
@@ -25,7 +25,7 @@ func WherePlanetN(xt, zn int, jd float64, n int) float64 {
 	t := (jd - 2451545) / 36525.0000
 	t /= 10 // 转为儒略千年数
 
-	body := planetViews[xt]
+	body := planetViews()[xt]
 	coord := body.coords[zn]
 	baseOrderTerms := len(coord.orders[0])
 
diff --git a/planet/planet_test.go b/planet/planet_test.go
index 1f846dc..b169e80 100644
--- a/planet/planet_test.go
+++ b/planet/planet_test.go
@@ -25,8 +25,9 @@ func TestWherePlanetNFullMatchesDefault(t *testing.T) {
 }
 
 func TestPlanetViewsMatchRawCuts(t *testing.T) {
+	views := planetViews()
 	for bodyIndex, raw := range planetRawData {
-		view := planetViews[bodyIndex]
+		view := views[bodyIndex]
 		if math.Float64bits(view.scale) != math.Float64bits(raw[0]) {
 			t.Fatalf("body=%d scale mismatch", bodyIndex)
 		}
@@ -42,3 +43,15 @@ func TestPlanetViewsMatchRawCuts(t *testing.T) {
 		}
 	}
 }
+
+func TestBuildPlanetViewsRejectsInvalidCuts(t *testing.T) {
+	_, err := buildPlanetViews([][]float64{{
+		10000000000,
+		20, 21, 20, 20, 20, 20, 20,
+		20, 20, 20, 20, 20, 20,
+		20, 20, 20, 20, 20, 20,
+	}})
+	if err == nil {
+		t.Fatal("expected invalid cut error")
+	}
+}
diff --git a/planet/view.go b/planet/view.go
index df807f0..2f9ecda 100644
--- a/planet/view.go
+++ b/planet/view.go
@@ -1,6 +1,9 @@
 package planet
 
-import "fmt"
+import (
+	"fmt"
+	"sync"
+)
 
 type coordSeriesView struct {
 	orders [6][]float64
@@ -11,13 +14,27 @@ type planetView struct {
 	coords [3]coordSeriesView
 }
 
-var planetViews = buildPlanetViews(planetRawData)
+var (
+	planetViewsOnce  sync.Once
+	planetViewsCache []planetView
+	planetViewsErr   error
+)
 
-func buildPlanetViews(rawData [][]float64) []planetView {
+func planetViews() []planetView {
+	planetViewsOnce.Do(func() {
+		planetViewsCache, planetViewsErr = buildPlanetViews(planetRawData)
+	})
+	if planetViewsErr != nil {
+		panic(planetViewsErr)
+	}
+	return planetViewsCache
+}
+
+func buildPlanetViews(rawData [][]float64) ([]planetView, error) {
 	views := make([]planetView, len(rawData))
 	for bodyIndex, raw := range rawData {
 		if len(raw) < 20 {
-			panic(fmt.Sprintf("planet raw data %d too short: %d", bodyIndex, len(raw)))
+			return nil, fmt.Errorf("planet raw data %d too short: %d", bodyIndex, len(raw))
 		}
 		view := planetView{scale: raw[0]}
 		for zn := 0; zn < 3; zn++ {
@@ -26,12 +43,12 @@ func buildPlanetViews(rawData [][]float64) []planetView {
 				start := int(raw[pn+order])
 				end := int(raw[pn+order+1])
 				if start < 0 || end < start || end > len(raw) {
-					panic(fmt.Sprintf("planet raw data %d coord %d order %d invalid cut: %d..%d (len=%d)", bodyIndex, zn, order, start, end, len(raw)))
+					return nil, fmt.Errorf("planet raw data %d coord %d order %d invalid cut: %d..%d (len=%d)", bodyIndex, zn, order, start, end, len(raw))
 				}
 				view.coords[zn].orders[order] = raw[start:end]
 			}
 		}
 		views[bodyIndex] = view
 	}
-	return views
+	return views, nil
 }