Add stub files and start porting tests

Author: mielvds

lib/pyld/iri_resolver.py

@@ -0,0 +1,51 @@
+def resolve(relative_iri: str, base_iri: str | None = None) -> str:
+    # TODO: implement
+    return ''
+
+def remove_dot_segments(path: str) -> str:
+    """
+    Removes dot segments from a URL path.
+
+    :param path: the path to remove dot segments from.
+
+    :return: a path with normalized dot segments.
+    """
+
+    # RFC 3986 5.2.4 (reworked)
+
+    # empty path shortcut
+    if len(path) == 0:
+        return ''
+
+    input = path.split('/')
+    output = []
+
+    while len(input) > 0:
+        next = input.pop(0)
+        done = len(input) == 0
+
+        if next == '.':
+            if done:
+                # ensure output has trailing /
+                output.append('')
+            continue
+
+        if next == '..':
+            if len(output) > 0:
+                output.pop()
+            if done:
+                # ensure output has trailing /
+                output.append('')
+            continue
+
+        output.append(next)
+
+    # ensure output has leading /
+    # merge path segments from section 5.2.3
+    # note that if the path includes no segments, the entire path is removed
+    if len(output) > 0 and path.startswith('/') and output[0] != '':
+        output.insert(0, '')
+    if len(output) == 1 and output[0] == '':
+        return '/'
+
+    return '/'.join(output)