move brackets and rename launcher

app/api/infobases.py

@@ -4,7 +4,7 @@ from flask_restful import Resource
 
 from app.glob import get_config, get_manager
 from app.manager import infobase_data_blank
-from brackets import get_infobases as br_get_infobases
+from app.brackets import get_infobases as br_get_infobases
 
 
 def load_infobases(config) -> List[str]:

app/brackets.py

@@ -0,0 +1,76 @@
+
+from typing import Union, List, Iterator
+
+BOM = '\ufeff'
+ParsingIterator = Iterator[Union[str, 'ParsingIterator']]
+NestedStringList = Union[str, List['NestedStringList']]
+
+
+def text_reader(filename: str, encoding: str = 'utf-8') -> Iterator[str]:
+    with open(filename, 'rt', encoding=encoding, buffering=1) as f:
+        while True:
+            chunk: str = f.read(1)
+            if 0 == len(chunk):
+                break
+            elif chunk.startswith(BOM):
+                continue
+            yield chunk
+
+
+def brackets_parser(reader: Iterator[str], level: int = 0) \
+        -> ParsingIterator:
+    cur_elem: str = ""
+    is_quoted: bool = False
+    for chunk in reader:
+        if '{' == chunk and not is_quoted:
+            if 0 == level:  # skip document root, always look at first {
+                level += 1
+                continue
+            nested = brackets_parser(reader, level + 1)
+            yield nested
+            # ensure we are done for nested
+            for _ in nested:
+                pass
+            continue
+        elif ',' == chunk and not is_quoted:
+            if 0 < len(cur_elem):
+                yield cur_elem
+                cur_elem = ''
+            continue
+        elif '}' == chunk and not is_quoted:
+            if 0 < len(cur_elem):
+                yield cur_elem
+            break
+        elif '"' == chunk:
+            is_quoted = not is_quoted
+            continue
+        elif '\n' == chunk or '\r' == chunk:
+            continue
+        cur_elem += chunk
+
+
+def brackets_select(parser: ParsingIterator, selector: str = '') \
+        -> NestedStringList:
+    if '' == selector:
+        l_selector = []
+        elem = parser
+    else:
+        l_selector = selector.split('/')
+        cur_sel: str = l_selector.pop(0)
+        idx: int = int(cur_sel)
+        _, elem = next(filter(lambda x: x[0] == idx, enumerate(parser)))
+
+    if 0 == len(l_selector):
+        if type(elem) == str:
+            return elem
+        else:
+            return [i if type(i) == str else brackets_select(i) for i in elem]
+
+    return brackets_select(elem, '/'.join(l_selector))
+
+
+def get_infobases(filename: str) -> List[str]:
+    reader = text_reader(filename)
+    parser = brackets_parser(reader)
+    base_list = brackets_select(parser, '2')[1:]
+    return list(map(lambda x: x[1], base_list))