From b894b639eac531a0638fbb52d97bdf6a4b05af2c Mon Sep 17 00:00:00 2001
From: jdl <jdl@crumpington.com>
Date: Tue, 12 Nov 2024 20:57:56 +0100
Subject: [PATCH] wip

---
 sqliteutil/README.md   |  27 +---------
 webutil/formscanner.go | 111 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+), 26 deletions(-)
 create mode 100644 webutil/formscanner.go

diff --git a/sqliteutil/README.md b/sqliteutil/README.md
index eb59767..84dd630 100644
--- a/sqliteutil/README.md
+++ b/sqliteutil/README.md
@@ -2,9 +2,7 @@
 
 ## Transactions
 
-Simplify postgres transactions using `WithTx` for serializable transactions,
-or `WithTxDefault` for the default isolation level. Use the `SerialTxRunner`
-type to get automatic retries of serialization errors.
+Simplify transactions using `WithTx`.
 
 ## Migrations
 
@@ -20,26 +18,3 @@ func init() {
     Migrate(db, migrations) // Check the error, of course.
 }
 ```
-
-## Testing
-
-In order to test this packge, we need to create a test user and database:
-
-```
-sudo su postgres
-psql
-
-CREATE DATABASE test;
-CREATE USER test WITH ENCRYPTED PASSWORD 'test';
-GRANT ALL PRIVILEGES ON DATABASE test TO test;
-
-use test
-
-GRANT ALL ON SCHEMA public TO test;
-```
-
-Check that you can connect via the command line:
-
-```
-psql -h 127.0.0.1 -U test --password test
-```
diff --git a/webutil/formscanner.go b/webutil/formscanner.go
new file mode 100644
index 0000000..0d50cb3
--- /dev/null
+++ b/webutil/formscanner.go
@@ -0,0 +1,111 @@
+package webutil
+
+import (
+	"errors"
+	"net/url"
+	"strconv"
+)
+
+var ErrUnsupportedType = errors.New("unsupported type")
+
+type FormScanner struct {
+	form url.Values
+	err  error
+}
+
+func NewFormScanner(form url.Values) *FormScanner {
+	return &FormScanner{form: form}
+}
+
+func (s *FormScanner) Scan(name string, val any) *FormScanner {
+	if s.err != nil {
+		return s
+	}
+
+	switch v := val.(type) {
+	case *bool:
+		*v = s.form.Has(name)
+	case *string:
+		*v = s.form.Get(name)
+	case *int:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = int(i)
+		}
+	case *int8:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 8); err != nil {
+			s.err = err
+		} else {
+			*v = int8(i)
+		}
+	case *int16:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 16); err != nil {
+			s.err = err
+		} else {
+			*v = int16(i)
+		}
+	case *int32:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 32); err != nil {
+			s.err = err
+		} else {
+			*v = int32(i)
+		}
+	case *int64:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = int64(i)
+		}
+	case *uint:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = uint(i)
+		}
+	case *uint8:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 8); err != nil {
+			s.err = err
+		} else {
+			*v = uint8(i)
+		}
+	case *uint16:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 16); err != nil {
+			s.err = err
+		} else {
+			*v = uint16(i)
+		}
+	case *uint32:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 32); err != nil {
+			s.err = err
+		} else {
+			*v = uint32(i)
+		}
+	case *uint64:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = uint64(i)
+		}
+	case *float32:
+		if f, err := strconv.ParseFloat(s.form.Get(name), 32); err != nil {
+			s.err = err
+		} else {
+			*v = float32(f)
+		}
+	case *float64:
+		if f, err := strconv.ParseFloat(s.form.Get(name), 64); err != nil {
+			s.err = err
+		} else {
+			*v = float64(f)
+		}
+	default:
+		s.err = ErrUnsupportedType
+	}
+
+	return s
+}
+
+func (s *FormScanner) Error() error {
+	return s.err
+}