1 files changed, 150 insertions, 0 deletions
diff --git a/markdown_it/rules_inline/link.py b/markdown_it/rules_inline/link.py
new file mode 100644
index 0000000..2394d6c
--- /dev/null
+++ b/markdown_it/rules_inline/link.py
@@ -0,0 +1,150 @@
+# Process [link](<to> "stuff")
+
+from ..common.utils import isSpace, normalizeReference
+from .state_inline import StateInline
+
+
+def link(state: StateInline, silent: bool):
+
+    href = ""
+    title = ""
+    label = None
+    oldPos = state.pos
+    maximum = state.posMax
+    start = state.pos
+    parseReference = True
+
+    if state.srcCharCode[state.pos] != 0x5B:  # /* [ */
+        return False
+
+    labelStart = state.pos + 1
+    labelEnd = state.md.helpers.parseLinkLabel(state, state.pos, True)
+
+    # parser failed to find ']', so it's not a valid link
+    if labelEnd < 0:
+        return False
+
+    pos = labelEnd + 1
+
+    if pos < maximum and state.srcCharCode[pos] == 0x28:  # /* ( */
+        #
+        # Inline link
+        #
+
+        # might have found a valid shortcut link, disable reference parsing
+        parseReference = False
+
+        # [link](  <href>  "title"  )
+        #        ^^ skipping these spaces
+        pos += 1
+        while pos < maximum:
+            code = state.srcCharCode[pos]
+            if not isSpace(code) and code != 0x0A:
+                break
+            pos += 1
+
+        if pos >= maximum:
+            return False
+
+        # [link](  <href>  "title"  )
+        #          ^^^^^^ parsing link destination
+        start = pos
+        res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax)
+        if res.ok:
+            href = state.md.normalizeLink(res.str)
+            if state.md.validateLink(href):
+                pos = res.pos
+            else:
+                href = ""
+
+            # [link](  <href>  "title"  )
+            #                ^^ skipping these spaces
+            start = pos
+            while pos < maximum:
+                code = state.srcCharCode[pos]
+                if not isSpace(code) and code != 0x0A:
+                    break
+                pos += 1
+
+            # [link](  <href>  "title"  )
+            #                  ^^^^^^^ parsing link title
+            res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax)
+            if pos < maximum and start != pos and res.ok:
+                title = res.str
+                pos = res.pos
+
+                # [link](  <href>  "title"  )
+                #                         ^^ skipping these spaces
+                while pos < maximum:
+                    code = state.srcCharCode[pos]
+                    if not isSpace(code) and code != 0x0A:
+                        break
+                    pos += 1
+
+        if pos >= maximum or state.srcCharCode[pos] != 0x29:  # /* ) */
+            # parsing a valid shortcut link failed, fallback to reference
+            parseReference = True
+
+        pos += 1
+
+    if parseReference:
+        #
+        # Link reference
+        #
+        if "references" not in state.env:
+            return False
+
+        if pos < maximum and state.srcCharCode[pos] == 0x5B:  # /* [ */
+            start = pos + 1
+            pos = state.md.helpers.parseLinkLabel(state, pos)
+            if pos >= 0:
+                label = state.src[start:pos]
+                pos += 1
+            else:
+                pos = labelEnd + 1
+
+        else:
+            pos = labelEnd + 1
+
+        # covers label == '' and label == undefined
+        # (collapsed reference link and shortcut reference link respectively)
+        if not label:
+            label = state.src[labelStart:labelEnd]
+
+        label = normalizeReference(label)
+
+        ref = (
+            state.env["references"][label] if label in state.env["references"] else None
+        )
+        if not ref:
+            state.pos = oldPos
+            return False
+
+        href = ref["href"]
+        title = ref["title"]
+
+    #
+    # We found the end of the link, and know for a fact it's a valid link
+    # so all that's left to do is to call tokenizer.
+    #
+    if not silent:
+        state.pos = labelStart
+        state.posMax = labelEnd
+
+        token = state.push("link_open", "a", 1)
+        token.attrs = {"href": href}
+
+        if title:
+            token.attrSet("title", title)
+
+        # note, this is not part of markdown-it JS, but is useful for renderers
+        if label and state.md.options.get("store_labels", False):
+            token.meta["label"] = label
+
+        state.md.inline.tokenize(state)
+
+        token = state.push("link_close", "a", -1)
+
+    state.pos = pos
+    state.posMax = maximum
+    return True