From e29e7ede3b3327586084db8108e8ed0f1ae48a32 Mon Sep 17 00:00:00 2001
From: Nathan Bergey <nathan.bergey@gmail.com>
Date: Tue, 13 Sep 2022 21:53:29 -0400
Subject: [PATCH] Bm: A simple test version seems to work

---
 src/bm.py | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/src/bm.py b/src/bm.py
index 5767ee9..8dce228 100644
--- a/src/bm.py
+++ b/src/bm.py
@@ -11,7 +11,7 @@ class Bm(object):
     def __init__(self, text: str, pattern: str):
         self.text = text
         self.pattern = pattern
-        self.table = make_km_table(pattern)
+        # self.table = make_km_table(pattern)
 
     def decide_slide_width(self, c: str) -> int:
         assert len(c) == 1
@@ -19,5 +19,36 @@ class Bm(object):
         return -1
 
     def search(self) -> int:
-        raise Exception("TODO")
+        PATTERN_LENGTH = len(self.pattern)
+        TEXT_LENGTH = len(self.text)
+
+        END_OF_PATTERN = PATTERN_LENGTH - 1
+        LAST_CHAR_OF_PATTERN = self.pattern[-1]
+
+        offset = {c: PATTERN_LENGTH - i -1  for i, c in enumerate(self.pattern[:-1])}
+        print(offset)
+
+        matches = []
+        head = END_OF_PATTERN
+
+        while head < TEXT_LENGTH:
+            print(f'{" " * (head - PATTERN_LENGTH + 1)}{self.pattern}')
+            print(self.text[:head + 1])
+            print(f'{" " * head}^')
+
+            if self.text[head] == LAST_CHAR_OF_PATTERN:
+                for i, c in enumerate(reversed(self.pattern)):
+                    # print(text[head - i], c)
+                    if self.text[head - i] != c:
+                        head += offset[self.text[head]]
+                        break
+                else:
+                    print("!!!")
+                    return head - PATTERN_LENGTH + 1
+            else:
+                try:
+                    head += offset[self.text[head]]
+                except KeyError:
+                    head += PATTERN_LENGTH
+            print('----------------------------------')
         return -1