doc update

README.md

@@ -147,6 +147,7 @@ option.
 - `--airport` enables the `airport -I` command parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/airport))
 - `--airport-s` enables the `airport -s` command parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/airport_s))
 - `--arp` enables the `arp` command parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/arp))
+- `--asciitable` enables the ASCII and Unicode table parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/asciitable))
 - `--asciitable-m` enables the multi-line ASCII and Unicode table parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/asciitable_m))
 - `--blkid` enables the `blkid` command parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/blkid))
 - `--cksum` enables the `cksum` and `sum` command parser ([documentation](https://kellyjonbrazil.github.io/jc/docs/parsers/cksum))

docs/parsers/asciitable.md

@@ -0,0 +1,97 @@
+[Home](https://kellyjonbrazil.github.io/jc/)
+<a id="jc.parsers.asciitable"></a>
+
+# jc.parsers.asciitable
+
+jc - JSON Convert `asciitable` parser
+
+This parser converts ASCII and Unicode text tables with single-line rows.
+
+Column headers must be at least two spaces apart from each other and must
+be unique.
+
+For example:
+
+    ╒══════════╤═════════╤════════╕
+    │ foo      │ bar     │ baz    │
+    ╞══════════╪═════════╪════════╡
+    │ good day │         │ 12345  │
+    ├──────────┼─────────┼────────┤
+    │ hi there │ abc def │ 3.14   │
+    ╘══════════╧═════════╧════════╛
+
+    or
+
+    +-----------------------------+
+    | foo        bar       baz    |
+    +-----------------------------+
+    | good day             12345  |
+    | hi there   abc def   3.14   |
+    +-----------------------------+
+
+    or
+
+    | foo      | bar     | baz    |
+    |----------|---------|--------|
+    | good day |         | 12345  |
+    | hi there | abc def | 3.14   |
+
+    or
+
+    foo        bar       baz
+    ---------  --------  ------
+    good day             12345
+    hi there   abc def
+
+    etc.
+
+Usage (cli):
+
+    $ cat table.txt | jc --asciitable
+
+Usage (module):
+
+    import jc
+    result = jc.parse('asciitable', asciitable_string)
+
+Schema:
+
+    [
+      {
+        "column_name1":     string,    # empty string is null
+        "column_name2":     string     # empty string is null
+      }
+    ]
+
+Examples:
+
+    $ asciitable | jc --asciitable -p
+    []
+
+    $ asciitable | jc --asciitable -p -r
+    []
+
+<a id="jc.parsers.asciitable.parse"></a>
+
+### parse
+
+```python
+def parse(data: str, raw: bool = False, quiet: bool = False) -> List[Dict]
+```
+
+Main text parsing function
+
+Parameters:
+
+    data:        (string)  text data to parse
+    raw:         (boolean) unprocessed output if True
+    quiet:       (boolean) suppress warning messages if True
+
+Returns:
+
+    List of Dictionaries. Raw or processed structured data.
+
+### Parser Information
+Compatibility:  linux, darwin, cygwin, win32, aix, freebsd
+
+Version 1.0 by Kelly Brazil (kellyjonbrazil@gmail.com)

docs/parsers/asciitable_m.md

@@ -41,8 +41,8 @@ Schema:
 
     [
       {
-        "column_name1":     string,
+        "column_name1":     string,    # empty string is null
-        "column_name2":     string
+        "column_name2":     string     # empty string is null
       }
     ]
 

jc/parsers/asciitable_m.py

@@ -36,8 +36,8 @@ Schema:
 
     [
       {
-        "column_name1":     string,
+        "column_name1":     string,    # empty string is null
-        "column_name2":     string
+        "column_name2":     string     # empty string is null
       }
     ]
 
@@ -92,7 +92,7 @@ Examples:
     ]
 """
 import re
-from typing import Iterable, Tuple, List, Dict
+from typing import Iterable, Tuple, List, Dict, Optional
 import jc.utils
 from jc.exceptions import ParseError
 
@@ -350,11 +350,21 @@ def _collapse_data(table: List[List[List[str]]]) -> List[List[str]]:
     return result
 
 
-def _create_table_dict(header: List[str], data: List[List[str]]) -> List[Dict[str, str]]:
+def _create_table_dict(header: List[str], data: List[List[str]]) -> List[Dict[str, Optional[str]]]:
-    return [dict(zip(header, r)) for r in data]
+    """
+    zip the headers and data to create a list of dictionaries. Also convert
+    empty strings to None.
+    """
+    table_list_dict: List[Dict[str, Optional[str]]] = [dict(zip(header, r)) for r in data]
+    for row in table_list_dict:
+        for k, v in row.items():
+            if v == '':
+                row[k] = None
+
+    return table_list_dict
 
 
-def _parse_pretty(string: str) -> List[Dict[str, str]]:
+def _parse_pretty(string: str) -> List[Dict[str, Optional[str]]]:
     string_lines: List[str] = string.splitlines()
     clean: List[Tuple[int, List[str]]] = _normalize_rows(string_lines)
     raw_headers: List[List[str]] = _get_headers(clean)
@@ -362,7 +372,7 @@ def _parse_pretty(string: str) -> List[Dict[str, str]]:
 
     new_headers: List[str] = _collapse_headers(raw_headers)
     new_data: List[List[str]] = _collapse_data(raw_data)
-    final_table: List[Dict[str, str]] = _create_table_dict(new_headers, new_data)
+    final_table: List[Dict[str, Optional[str]]] = _create_table_dict(new_headers, new_data)
 
     return final_table
 

man/jc.1

@@ -37,6 +37,11 @@ Parsers:
 \fB--arp\fP
 `arp` command parser
 
+.TP
+.B
+\fB--asciitable\fP
+ASCII and Unicode table parser
+
 .TP
 .B
 \fB--asciitable-m\fP