fix(ntc_parse): strip prompt/command echo for ntc-templates 9.x strict templates

ntc-templates 9.x ends template states with '^. -> Error', so an echoed
'R2#show lldp neighbors' line or trailing prompt aborts the whole TextFSM
parse (Cisco LLDP brief returned 0 rows). Strip edge echo/prompt lines
before parsing in parse_cli/apply_rule; covers Cisco/H3C/Juniper/AOS
community templates too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netx_api/ntc_parse.py

@@ -95,6 +95,31 @@ def resolve_cli_platform(*, vendor: str = "", device_type: str = "", vendor_key:
     return ""
 
 
+# Device prompt: <HUAWEI>, [~HUAWEI], R2#, user@host>, RP/0/RSP0/CPU0:xr# ...
+_PROMPT = r"(?:<[^<>\s]+>|\[[^\[\]\s]+\]|[\w.\-@:/()~]+[#>])"
+_PROMPT_ECHO_RE = re.compile(rf"^\s*{_PROMPT}\s*\S.*$")
+_PROMPT_ONLY_RE = re.compile(rf"^\s*{_PROMPT}\s*$")
+
+
+def strip_cli_echo(text: str) -> str:
+    """Drop leading ``prompt+command`` echo and trailing bare prompt lines.
+
+    Newer ntc-templates (9.x) end Start/body states with ``^. -> Error``, so an
+    echoed ``R2#show lldp neighbors`` or a trailing ``R2#`` aborts the whole parse.
+    Only the edges are touched; table body lines are left as-is.
+    """
+    lines = str(text or "").splitlines()
+    start = 0
+    while start < len(lines) and not lines[start].strip():
+        start += 1
+    if start < len(lines) and _PROMPT_ECHO_RE.match(lines[start]):
+        start += 1
+    end = len(lines)
+    while end > start and (not lines[end - 1].strip() or _PROMPT_ONLY_RE.match(lines[end - 1])):
+        end -= 1
+    return "\n".join(lines[start:end]) + "\n"
+
+
 def row_get(row: dict[str, Any], *names: str) -> str:
     if not row:
         return ""
@@ -286,6 +311,7 @@ def apply_rule(*, platform: str, rule_key: str, text: str, command: str = "") ->
     wrap_cmd = str(command or "").strip() or key.replace("_", " ")
     if plat:
         raw = apply_cli_wrap(raw, platform=plat, command=wrap_cmd)
+    raw = strip_cli_echo(raw)
 
     entries = _find_entries_for_stem(key)
     if plat:
@@ -350,7 +376,7 @@ def parse_cli(
     """Parse CLI text: wrap-join → custom templates → community ntc-templates."""
     plat = str(platform or "").strip()
     cmd = str(command or "").strip()
-    raw = apply_cli_wrap(str(text or ""), platform=plat, command=cmd)
+    raw = strip_cli_echo(apply_cli_wrap(str(text or ""), platform=plat, command=cmd))
     if not plat or not cmd or not raw.strip():
         return []
 

tests/test_ntc_parse.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import unittest
 
-from netx_api.ntc_parse import parse_cli, resolve_cli_platform
+from netx_api.ntc_parse import parse_cli, resolve_cli_platform, strip_cli_echo
 from netx_api.port_traffic_parsers import parse_interface_brief, parse_interface_detail
 from netx_api import topology_lldp as lldp
 
@@ -172,5 +172,36 @@ ge-0/0/1.0         ge-0/0/1            00:11:22:33:44:55   ge-0/0/0.0    r1
         self.assertEqual(jhits[0].local_port, "ge-0/0/1.0")
 
 
+class CliEchoTests(unittest.TestCase):
+    """ntc-templates 9.x ends states with ``^. -> Error``; echo/prompt must be stripped."""
+
+    def test_strip_edges_only(self) -> None:
+        text = "\nR2#show lldp neighbors\nDevice ID  Local Intf\nr1  Gi0/1\nR2#\n"
+        self.assertEqual(strip_cli_echo(text), "Device ID  Local Intf\nr1  Gi0/1\n")
+        for prompt in ("<HUAWEI>display lldp neighbor", "[~HUAWEI]display lldp neighbor",
+                       "user@r2> show lldp neighbors", "ZXR10#show lldp neighbor brief"):
+            self.assertEqual(strip_cli_echo(prompt + "\nbody\n"), "body\n")
+        self.assertEqual(strip_cli_echo("Device ID  Local Intf\n"), "Device ID  Local Intf\n")
+
+    def test_lldp_with_echo_and_prompt(self) -> None:
+        h3c = """\
+<H3C>display lldp neighbor-information list
+Local Interface Chassis ID      Port ID        System Name
+GE1/0/1         0000-5e00-0101  GE1/0/2        SW-A
+<H3C>
+"""
+        self.assertEqual(len(lldp.parse_h3c_lldp(h3c)), 1)
+        junos = """\
+user@r2> show lldp neighbors
+Local Interface    Parent Interface    Chassis Id          Port info     System Name
+ge-0/0/1.0         ge-0/0/1            00:11:22:33:44:55   ge-0/0/0.0    r1
+
+user@r2>
+"""
+        self.assertEqual(len(lldp.parse_juniper_lldp(junos)), 1)
+        cisco = "R2#show lldp neighbors detail\n" + CISCO_LLDP_DETAIL + "R2#\n"
+        self.assertEqual(len(lldp.parse_cisco_lldp(cisco)), 1)
+
+
 if __name__ == "__main__":
     unittest.main()