use expect struct instead of asserts

src/paragraph/parser/abschnitt.rs

@@ -22,7 +22,7 @@ use roxmltree::{Children, Node};
 
 use crate::law;
 use crate::paragraph::parser::absatz::Absatz;
-use crate::paragraph::parser::{AbsatzAbs, Content, Fzinhalt, Kzinhalt, Ueberschrift};
+use crate::paragraph::parser::{AbsatzAbs, Content, Expect, Fzinhalt, Kzinhalt, Ueberschrift};
 
 #[derive(Debug, PartialEq, Default)]
 pub(crate) struct Abschnitt {
@@ -32,7 +32,7 @@ pub(crate) struct Abschnitt {
 
 impl Abschnitt {
     pub(crate) fn parse(n: Node, builder: &mut law::Builder) -> Abschnitt {
-        assert!(n.tag_name().name() == "abschnitt");
+        Expect::from(&n).tag("abschnitt");
 
         let mut ret = Abschnitt::default();
         let mut c = n.children().peekable();

src/paragraph/parser/mod.rs

@@ -19,7 +19,7 @@ mod abschnitt;
 mod liste;
 mod table;
 
-use std::iter::Peekable;
+use std::{fmt::Display, iter::Peekable};
 
 use abschnitt::Abschnitt;
 use log::trace;
@@ -42,14 +42,36 @@ impl<'a> From<&'a Node<'a, 'a>> for Expect<'a> {
 }
 
 impl<'a> Expect<'a> {
-    fn tag(&self, value: &str) {
+    fn tag(self, value: &str) -> Self {
         assert!(
             self.node.tag_name().name() == value,
-            "Expected tag '{value}', got {} (tag: {}, content: {:?})",
+            "Expected tag '{value}', got {} ({})",
             self.node.tag_name().name(),
-            self.node.tag_name().name(),
-            self.node.text(),
+            self,
         );
+        self
+    }
+
+    fn amount_children(self, value: usize) -> Self {
+        assert!(
+            self.node.children().count() == value,
+            "Expected {value} children elements for tag '{value}', got {} ({})",
+            self.node.children().count(),
+            self
+        );
+        self
+    }
+}
+
+impl Display for Expect<'_> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&format!(
+            "tag: {}, content: {:?}",
+            self.node.tag_name().name(),
+            self.node.text()
+        ))
+        .unwrap();
+        Ok(())
     }
 }
 
@@ -58,7 +80,7 @@ pub(crate) struct Risdok {}
 
 impl Risdok {
     pub(crate) fn parse(n: Node, builder: &mut law::Builder) -> bool {
-        assert!(n.tag_name().name() == "risdok");
+        Expect::from(&n).tag("risdok");
 
         let mut c = n.children();
 
@@ -87,7 +109,7 @@ impl Risdok {
 pub(crate) struct Metadaten;
 impl Metadaten {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "metadaten");
+        Expect::from(&n).tag("metadaten");
 
         assert_eq!(n.children().next(), None);
 
@@ -99,7 +121,7 @@ impl Metadaten {
 pub(crate) struct Nutzdaten {}
 impl Nutzdaten {
     pub(crate) fn parse(n: Node, builder: &mut law::Builder) -> bool {
-        assert!(n.tag_name().name() == "nutzdaten");
+        Expect::from(&n).tag("nutzdaten");
 
         let mut c = n.children();
 
@@ -118,8 +140,7 @@ pub(crate) struct Symbol {
 }
 impl Symbol {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "symbol");
-        assert_eq!(n.children().count(), 1);
+        Expect::from(&n).tag("symbol").amount_children(1);
 
         let stellen = n.attribute("stellen").unwrap().into();
         let content = n.text().unwrap().into();
@@ -135,7 +156,7 @@ pub(crate) struct Listelem {
 }
 impl Listelem {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "listelem");
+        Expect::from(&n).tag("listelem");
 
         let mut c = n.children();
 
@@ -245,7 +266,7 @@ pub(crate) struct Td {
 }
 impl Td {
     pub(crate) fn parse(n: &Node) -> Self {
-        assert!(n.tag_name().name() == "td");
+        Expect::from(n).tag("td");
 
         let mut c = n.children();
         let absatz = Absatz::parse(c.next().unwrap());
@@ -262,7 +283,7 @@ pub(crate) struct Tr {
 }
 impl Tr {
     pub(crate) fn parse(n: &Node) -> Self {
-        assert!(n.tag_name().name() == "tr");
+        Expect::from(n).tag("tr");
 
         let mut tds = Vec::new();
 
@@ -344,9 +365,7 @@ impl Leaf {
         n.tag_name().name() == name && n.children().count() == 1
     }
     pub(crate) fn parse(n: Node, name: &str) -> String {
-        assert!(n.tag_name().name() == name);
-
-        assert_eq!(n.children().count(), 1);
+        Expect::from(&n).tag(name).amount_children(1);
 
         n.text().unwrap().into()
     }
@@ -362,7 +381,7 @@ impl Ueberschrift {
     }
 
     pub(crate) fn parse(n: Node, typ: &str) -> Self {
-        assert!(n.tag_name().name() == "ueberschrift");
+        Expect::from(&n).tag("ueberschrift");
 
         assert_eq!(n.attribute("typ").unwrap(), typ);
 
@@ -377,7 +396,7 @@ impl Ueberschrift {
 pub(crate) struct Kzinhalt;
 impl Kzinhalt {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "kzinhalt");
+        Expect::from(&n).tag("kzinhalt");
         //TODO parse if necessary
         Self {}
     }
@@ -387,7 +406,7 @@ impl Kzinhalt {
 pub(crate) struct Fzinhalt;
 impl Fzinhalt {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "fzinhalt");
+        Expect::from(&n).tag("fzinhalt");
         //TODO parse if necessary
         Self {}
     }
@@ -397,7 +416,7 @@ impl Fzinhalt {
 pub(crate) struct Layoutdaten;
 impl Layoutdaten {
     pub(crate) fn parse(n: Node) -> Self {
-        assert!(n.tag_name().name() == "layoutdaten");
+        Expect::from(&n).tag("layoutdaten");
 
         assert_eq!(n.children().next(), None);