[PATCH v2 16/20] rv/rvgen: extract node marker string to class constant

[Wander Lairson Costa <wander@redhat.com>]

Add a node_marker class constant to the Automata class to replace the
hardcoded "{node" string literal used throughout the DOT file parsing
logic. This follows the existing pattern established by the init_marker
and invalid_state_str class constants in the same class.

The "{node" string is used as a marker to identify node declaration
lines in DOT files during state variable extraction and cursor
positioning. Extracting it to a named constant improves code
maintainability and makes the marker's purpose explicit.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
---
 tools/verification/rvgen/rvgen/automata.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/verification/rvgen/rvgen/automata.py b/tools/verification/rvgen/rvgen/automata.py
index 17b012b868531..270a3d0bf4ce7 100644
--- a/tools/verification/rvgen/rvgen/automata.py
+++ b/tools/verification/rvgen/rvgen/automata.py
@@ -27,6 +27,7 @@ class Automata:
 
     invalid_state_str = "INVALID_STATE"
     init_marker = "__init_"
+    node_marker = "{node"
 
     def __init__(self, file_path, model_name=None):
         self.__dot_path = file_path
@@ -72,7 +73,7 @@ class Automata:
         for cursor, line in enumerate(self.__dot_lines):
             split_line = line.split()
 
-            if len(split_line) and split_line[0] == "{node":
+            if len(split_line) and split_line[0] == self.node_marker:
                 return cursor
 
         raise AutomataError("Could not find a beginning state")
@@ -87,9 +88,9 @@ class Automata:
                 continue
 
             if state == 0:
-                if line[0] == "{node":
+                if line[0] == self.node_marker:
                     state = 1
-            elif line[0] != "{node":
+            elif line[0] != self.node_marker:
                 break
         else:
             raise AutomataError("Could not find beginning event")
@@ -111,7 +112,7 @@ class Automata:
         # process nodes
         for line in islice(self.__dot_lines, cursor, None):
             split_line = line.split()
-            if not split_line or split_line[0] != "{node":
+            if not split_line or split_line[0] != self.node_marker:
                 break
 
             raw_state = split_line[-1]
-- 
2.52.0