1 files changed, 91 insertions, 0 deletions
diff --git a/markdown_it/rules_block/html_block.py b/markdown_it/rules_block/html_block.py
new file mode 100644
index 0000000..31afab7
--- /dev/null
+++ b/markdown_it/rules_block/html_block.py
@@ -0,0 +1,91 @@
+# HTML block
+from __future__ import annotations
+
+import logging
+import re
+
+from ..common.html_blocks import block_names
+from ..common.html_re import HTML_OPEN_CLOSE_TAG_STR
+from .state_block import StateBlock
+
+LOGGER = logging.getLogger(__name__)
+
+# An array of opening and corresponding closing sequences for html tags,
+# last argument defines whether it can terminate a paragraph or not
+HTML_SEQUENCES: list[tuple[re.Pattern, re.Pattern, bool]] = [
+    (
+        re.compile(r"^<(script|pre|style|textarea)(?=(\s|>|$))", re.IGNORECASE),
+        re.compile(r"<\/(script|pre|style|textarea)>", re.IGNORECASE),
+        True,
+    ),
+    (re.compile(r"^<!--"), re.compile(r"-->"), True),
+    (re.compile(r"^<\?"), re.compile(r"\?>"), True),
+    (re.compile(r"^<![A-Z]"), re.compile(r">"), True),
+    (re.compile(r"^<!\[CDATA\["), re.compile(r"\]\]>"), True),
+    (
+        re.compile("^</?(" + "|".join(block_names) + ")(?=(\\s|/?>|$))", re.IGNORECASE),
+        re.compile(r"^$"),
+        True,
+    ),
+    (re.compile(HTML_OPEN_CLOSE_TAG_STR + "\\s*$"), re.compile(r"^$"), False),
+]
+
+
+def html_block(state: StateBlock, startLine: int, endLine: int, silent: bool):
+    LOGGER.debug(
+        "entering html_block: %s, %s, %s, %s", state, startLine, endLine, silent
+    )
+    pos = state.bMarks[startLine] + state.tShift[startLine]
+    maximum = state.eMarks[startLine]
+
+    # if it's indented more than 3 spaces, it should be a code block
+    if state.sCount[startLine] - state.blkIndent >= 4:
+        return False
+
+    if not state.md.options.get("html", None):
+        return False
+
+    if state.srcCharCode[pos] != 0x3C:  # /* < */
+        return False
+
+    lineText = state.src[pos:maximum]
+
+    html_seq = None
+    for HTML_SEQUENCE in HTML_SEQUENCES:
+        if HTML_SEQUENCE[0].search(lineText):
+            html_seq = HTML_SEQUENCE
+            break
+
+    if not html_seq:
+        return False
+
+    if silent:
+        # true if this sequence can be a terminator, false otherwise
+        return html_seq[2]
+
+    nextLine = startLine + 1
+
+    # If we are here - we detected HTML block.
+    # Let's roll down till block end.
+    if not html_seq[1].search(lineText):
+        while nextLine < endLine:
+            if state.sCount[nextLine] < state.blkIndent:
+                break
+
+            pos = state.bMarks[nextLine] + state.tShift[nextLine]
+            maximum = state.eMarks[nextLine]
+            lineText = state.src[pos:maximum]
+
+            if html_seq[1].search(lineText):
+                if len(lineText) != 0:
+                    nextLine += 1
+                break
+            nextLine += 1
+
+    state.line = nextLine
+
+    token = state.push("html_block", "", 0)
+    token.map = [startLine, nextLine]
+    token.content = state.getLines(startLine, nextLine, state.blkIndent, True)
+
+    return True