Created
December 8, 2019 19:55
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def match(path, expr): | |
names = expr.split('.')[1:] | |
curr_name = 0 | |
curr_path = 0 | |
wildpath = False | |
while curr_path < len(path): | |
el = path[curr_path] | |
if curr_name == len(names): | |
print("Unexpected end of expr, match failed!") | |
return False | |
name = names[curr_name] | |
if name == el: | |
print("Match: ", el, " to ", name) | |
curr_name += 1 | |
wildpath = False | |
curr_path += 1 | |
elif not name: #wildpath | |
print("Entering wildpath") | |
wildpath = True | |
curr_name += 1 | |
elif wildpath: | |
print("No match ", el, " to ", name, " (wildpath)") | |
curr_path += 1 | |
else: | |
print("No match ", el, " to ", name, ", match failed") | |
return False | |
if curr_name < len(names): | |
print("Elements of expression remaning: ", ".".join(names[curr_name:]), ", match failed!") | |
return False | |
return True | |
path = [ 'a', 'd', 'c', 'd', 'e' ] | |
expr = "..a..d.e" | |
print(match(path,expr)) | |
#TODO: Split by '..' into exact matches and then match each eact match individually | |
def match2(path, expr): | |
exact_exprs = expr.split('..') | |
print("Found sub-expressions: ", ", ".join(exact_exprs)) | |
offset = 0 | |
for expr in exact_exprs: | |
print("Matching sub-expression ", expr, " to path ", path[offset:]) | |
if not expr: | |
continue | |
names = [ name for name in expr.split(".") if name ] | |
print("Trying to match ", expr, " to ", path) | |
found_result = None | |
for i in range(offset, len(path)): | |
sub_path = path[i:i+len(names)] | |
if names == sub_path: | |
found_result = True | |
offset = i+len(names) | |
print("Found match at offset", i) | |
break | |
if not found_result: | |
print("Could not find a match!") | |
return False | |
return True | |
path = [ 'a', 'd', 'c', 'd', 'e' ] | |
expr = ".a..d...d.e" | |
print(match2(path,expr)) |
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