1 files changed, 86 insertions, 0 deletions
diff --git a/markdown_it/helpers/parse_link_destination.py b/markdown_it/helpers/parse_link_destination.py
new file mode 100644
index 0000000..58b76f3
--- /dev/null
+++ b/markdown_it/helpers/parse_link_destination.py
@@ -0,0 +1,86 @@
+"""
+Parse link destination
+"""
+
+from ..common.utils import charCodeAt, unescapeAll
+
+
+class _Result:
+    __slots__ = ("ok", "pos", "lines", "str")
+
+    def __init__(self):
+        self.ok = False
+        self.pos = 0
+        self.lines = 0
+        self.str = ""
+
+
+def parseLinkDestination(string: str, pos: int, maximum: int) -> _Result:
+    lines = 0
+    start = pos
+    result = _Result()
+
+    if charCodeAt(string, pos) == 0x3C:  # /* < */
+        pos += 1
+        while pos < maximum:
+            code = charCodeAt(string, pos)
+            if code == 0x0A:  # /* \n */)
+                return result
+            if code == 0x3C:  # / * < * /
+                return result
+            if code == 0x3E:  # /* > */) {
+                result.pos = pos + 1
+                result.str = unescapeAll(string[start + 1 : pos])
+                result.ok = True
+                return result
+
+            if code == 0x5C and pos + 1 < maximum:  # \
+                pos += 2
+                continue
+
+            pos += 1
+
+        # no closing '>'
+        return result
+
+    # this should be ... } else { ... branch
+
+    level = 0
+    while pos < maximum:
+        code = charCodeAt(string, pos)
+
+        if code == 0x20:
+            break
+
+        # ascii control characters
+        if code < 0x20 or code == 0x7F:
+            break
+
+        if code == 0x5C and pos + 1 < maximum:
+            if charCodeAt(string, pos + 1) == 0x20:
+                break
+            pos += 2
+            continue
+
+        if code == 0x28:  # /* ( */)
+            level += 1
+            if level > 32:
+                return result
+
+        if code == 0x29:  # /* ) */)
+            if level == 0:
+                break
+            level -= 1
+
+        pos += 1
+
+    if start == pos:
+        return result
+    if level != 0:
+        return result
+
+    result.str = unescapeAll(string[start:pos])
+    result.lines = lines
+    result.pos = pos
+    result.ok = True
+    return result