misc: Add Boyer-Moore string search algorithm

.gitignore

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+.pytest_cache/
+.venv/
+
+Pipfile.lock

Pipfile

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+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+pytest = "*"
+
+[packages]
+
+[requires]
+python_version = "3.7"
+
+[scripts]
+unittest = "pipenv run pytest -s"

README.md

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+Algorithm test
+===
+
+### Usage
+
+```bash
+$ python3 -m pip install pipenv
+
+# Use virtualenv
+$ PIPENV_VENV_IN_PROJECT=true pipenv shell
+
+$ pipenv install --dev
+```
+
+- Unittest
+
+```bash
+$ pipenv run unittest
+```

__init__.py

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+import sys
+import os
+
+sys.path.append(os.path.join(
+    os.path.dirname(os.path.realpath(__file__)),
+    "src"
+))
+sys.path.append(os.path.join(
+    os.path.dirname(os.path.realpath(__file__))
+))

src/bm.py

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+from typing import Dict
+
+
+def make_km_table(pattern: str) -> Dict[str, int]:
+    table = dict()
+    raise Exception("TODO")
+    return table
+
+
+class Bm(object):
+    def __init__(self, text: str, pattern: str):
+        self.text = text
+        self.pattern = pattern
+        self.table = make_km_table(pattern)
+
+    def decide_slide_width(self, c: str) -> int:
+        assert len(c) == 1
+        raise Exception("TODO")
+        return -1
+
+    def search(self) -> int:
+        raise Exception("TODO")
+        return -1

test/test_bm.py

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+import pytest
+
+from src.bm import Bm
+
+@pytest.mark.parametrize("text,pattern,expected", [
+    ("GCTCACTGAGCGCTCGT", "GCTCG", 11),
+    ("GCTCACTGAGCGCTCGT", "CACTGAG", 3),
+    ("GCTCACTGAGCGCTCGT", "AAAAA", -1),
+    ("GCTCACTGAGCGCTCGT", "GCTCGTT", -1),
+    ("GCTCACTGAGCGCTCGT", "GCTCACTGAGCGCTCGT", 0),
+    ("ANPANMAN", "PAN", 2),
+    ("ANPANMAN", "ANPAN", 0),
+    ("ANPANMAN", "BIKINMAN", -1),
+])
+def test_bm(text, pattern, expected):
+    bm = Bm(text, pattern)
+
+    actual = bm.search()
+
+    assert actual == expected
+    # assert False  # for print debugging