1 files changed, 52 insertions, 0 deletions
diff --git a/src/wav/xml/helpers.odin b/src/wav/xml/helpers.odin
new file mode 100644
index 0000000..79f2d72
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+++ b/src/wav/xml/helpers.odin
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+package encoding_xml
+
+/*
+	An XML 1.0 / 1.1 parser
+
+	Copyright 2021-2022 Jeroen van Rijn <nom@duclavier.com>.
+	Made available under Odin's license.
+
+	This file contains helper functions.
+*/
+
+
+// Find parent's nth child with a given ident.
+find_child_by_ident :: proc(doc: ^Document, parent_id: Element_ID, ident: string, nth := 0) -> (res: Element_ID, found: bool) {
+	tag := doc.elements[parent_id]
+
+	count := 0
+	for v in tag.value {
+		switch child_id in v {
+		case string: continue
+		case Element_ID:
+			child := doc.elements[child_id]
+			/*
+				Skip commments. They have no name.
+			*/
+			if child.kind != .Element { continue }
+
+			/*
+				If the ident matches and it's the nth such child, return it.
+			*/
+			if child.ident == ident {
+				if count == nth { return child_id, true }
+				count += 1
+			}
+		}
+
+	}
+	return 0, false
+}
+
+// Find an attribute by key.
+find_attribute_val_by_key :: proc(doc: ^Document, parent_id: Element_ID, key: string) -> (val: string, found: bool) {
+	tag := doc.elements[parent_id]
+
+	for attr in tag.attribs {
+		/*
+			If the ident matches, we're done. There can only ever be one attribute with the same name.
+		*/
+		if attr.key == key { return attr.val, true }
+	}
+	return "", false
+}