Create parser/preamble_extractor.py

parser/preamble_extractor.py

@@ -0,0 +1,26 @@
+# parser/preamble_extractor.py
+import re
+from typing import List, Tuple
+from parser.article_extractor import ARTICLE_PATTERN
+from parser.section_extractor import SECTION_KEYWORDS, SECTION_RE
+
+def extract_preamble(text_blocks: List[str]) -> Tuple[List[str], List[str]]:
+    preamble_lines = []
+    remaining_lines = []
+    found_structure = False
+
+    for block in text_blocks:
+        for line in block.splitlines():
+            line = line.strip()
+            if not line:
+                continue
+
+            if re.match(SECTION_RE, line) or ARTICLE_PATTERN.match(line):
+                found_structure = True
+
+            if found_structure:
+                remaining_lines.append(line)
+            else:
+                preamble_lines.append(line)
+
+    return preamble_lines, remaining_lines