From 081809e8a69649fafb59fa11dd629e9d00117a7a Mon Sep 17 00:00:00 2001
From: fgy <fanguangyu.fgy1995@bytedance.com>
Date: Thu, 5 Jan 2023 12:30:11 +0800
Subject: [PATCH] feat: support float

---
 bind_test.go             | 19 +++++++++++++++++++
 internal/bind/compile.go |  4 ++++
 internal/bind/float.go   | 19 +++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 internal/bind/float.go

diff --git a/bind_test.go b/bind_test.go
index b94ba4d5..1dcd1b9e 100644
--- a/bind_test.go
+++ b/bind_test.go
@@ -497,3 +497,22 @@ func Benchmark_Bind(b *testing.B) {
 		}
 	}
 }
+
+func Test_Binder_Float(t *testing.T) {
+	t.Parallel()
+	app := New()
+
+	ctx := app.NewCtx(&fasthttp.RequestCtx{}).(*DefaultCtx)
+	ctx.values = [maxParams]string{"3.14"}
+	ctx.route = &Route{Params: []string{"id"}}
+
+	var req struct {
+		ID1 float32 `param:"id"`
+		ID2 float64 `param:"id"`
+	}
+
+	err := ctx.Bind().Req(&req).Err()
+	require.NoError(t, err)
+	require.Equal(t, float32(3.14), req.ID1)
+	require.Equal(t, float64(3.14), req.ID2)
+}
diff --git a/internal/bind/compile.go b/internal/bind/compile.go
index da5ca7ae..252afc6e 100644
--- a/internal/bind/compile.go
+++ b/internal/bind/compile.go
@@ -43,6 +43,10 @@ func CompileTextDecoder(rt reflect.Type) (TextDecoder, error) {
 		return &intDecoder{}, nil
 	case reflect.String:
 		return &stringDecoder{}, nil
+	case reflect.Float32:
+		return &floatDecoder{bitSize: 32}, nil
+	case reflect.Float64:
+		return &floatDecoder{bitSize: 64}, nil
 	}
 
 	return nil, errors.New("unsupported type " + rt.String())
diff --git a/internal/bind/float.go b/internal/bind/float.go
new file mode 100644
index 00000000..300cbf7b
--- /dev/null
+++ b/internal/bind/float.go
@@ -0,0 +1,19 @@
+package bind
+
+import (
+	"reflect"
+	"strconv"
+)
+
+type floatDecoder struct {
+	bitSize int
+}
+
+func (d *floatDecoder) UnmarshalString(s string, fieldValue reflect.Value) error {
+	v, err := strconv.ParseFloat(s, d.bitSize)
+	if err != nil {
+		return err
+	}
+	fieldValue.SetFloat(v)
+	return nil
+}