vweb: router refactor (#12041)

vlib/vweb/parse.v

@@ -0,0 +1,74 @@
+module vweb
+
+import net.urllib
+import net.http
+
+// Parsing function attributes for methods and path.
+fn parse_attrs(name string, attrs []string) ?([]http.Method, string) {
+	if attrs.len == 0 {
+		return [http.Method.get], '/$name'
+	}
+
+	mut x := attrs.clone()
+	mut methods := []http.Method{}
+	mut path := ''
+
+	for i := 0; i < x.len; {
+		attr := x[i]
+		attru := attr.to_upper()
+		m := http.method_from_str(attru)
+		if attru == 'GET' || m != .get {
+			methods << m
+			x.delete(i)
+			continue
+		}
+		if attr.starts_with('/') {
+			if path != '' {
+				return IError(http.MultiplePathAttributesError{})
+			}
+			path = attr
+			x.delete(i)
+			continue
+		}
+		i++
+	}
+	if x.len > 0 {
+		return IError(http.UnexpectedExtraAttributeError{
+			msg: 'Encountered unexpected extra attributes: $x'
+		})
+	}
+	if methods.len == 0 {
+		methods = [http.Method.get]
+	}
+	if path == '' {
+		path = '/$name'
+	}
+	// Make path lowercase for case-insensitive comparisons
+	return methods, path.to_lower()
+}
+
+fn parse_query_from_url(url urllib.URL) map[string]string {
+	mut query := map[string]string{}
+	for k, v in url.query().data {
+		query[k] = v.data[0]
+	}
+	return query
+}
+
+fn parse_form_from_request(request http.Request) ?(map[string]string, map[string][]http.FileData) {
+	mut form := map[string]string{}
+	mut files := map[string][]http.FileData{}
+	if request.method in methods_with_form {
+		ct := request.header.get(.content_type) or { '' }.split(';').map(it.trim_left(' \t'))
+		if 'multipart/form-data' in ct {
+			boundary := ct.filter(it.starts_with('boundary='))
+			if boundary.len != 1 {
+				return error('detected more that one form-data boundary')
+			}
+			form, files = http.parse_multipart_form(request.data, boundary[0][9..])
+		} else {
+			form = http.parse_form(request.data)
+		}
+	}
+	return form, files
+}