scripts: west_commands: Remove no longer needed load_dot_config(path)

The functionality of the function is now covered by BuildConfiguration
class.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

scripts/west_commands/zephyr_ext_common.py

@@ -10,7 +10,6 @@ commands which specifically execute runners.'''
 
 import os
 from pathlib import Path
-import re
 
 from west import log
 from west.commands import WestCommand
@@ -46,65 +45,3 @@ class Forceable(WestCommand):
         if not (cond or self.args.force):
             log.err(msg)
             log.die('refusing to proceed without --force due to above error')
-
-
-def load_dot_config(path):
-    '''Load a Kconfig .config output file in 'path' and return a dict
-    from symbols set in that file to their values.
-
-    This parser:
-
-    - respects the usual "# CONFIG_FOO is not set" --> CONFIG_FOO=n
-      semantics
-    - converts decimal or hexadecimal integer literals to ints
-    - strips quotes around strings
-    '''
-
-    # You might think it would be easier to create a new
-    # kconfiglib.Kconfig object and use its load_config() method to
-    # parse the file instead.
-    #
-    # Beware, traveler: that way lies madness.
-    #
-    # Zephyr's Kconfig files rely heavily on environment variables to
-    # manage user-configurable directory locations, and recreating
-    # that state turns out to be a surprisingly fragile process. It's
-    # not just 'srctree'; there are various others and they change
-    # randomly as features get merged.
-    #
-    # Nor will pickling the Kconfig object come to your aid. It's a
-    # deeply recursive data structure which requires a very high
-    # system recursion limit (100K frames seems to do it) and contains
-    # references to un-pickle-able values in its attributes.
-    #
-    # It's easier and in fact more robust to rely on the fact that the
-    # .config file contents are just a strictly formatted Makefile
-    # fragment with some extra "is not set" semantics.
-
-    opt_value = re.compile('^(?P<option>CONFIG_[A-Za-z0-9_]+)=(?P<value>.*)$')
-    not_set = re.compile('^# (?P<option>CONFIG_[A-Za-z0-9_]+) is not set$')
-
-    with open(path, 'r') as f:
-        lines = f.readlines()
-
-    ret = {}
-    for line in lines:
-        match = opt_value.match(line)
-        if match:
-            value = match.group('value')
-            if value.startswith('"') and value.endswith('"'):
-                value = value[1:-1]
-            else:
-                try:
-                    base = 16 if value.startswith('0x') else 10
-                    value = int(value, base=base)
-                except ValueError:
-                    pass
-
-            ret[match.group('option')] = value
-
-        match = not_set.match(line)
-        if match:
-            ret[match.group('option')] = 'n'
-
-    return ret