def intersect_description(first, second):
"""
Intersect two description objects.
:param first: First object to intersect with.
:param second: Other object to intersect with.
:return: New object.
"""
# Check that none of the object is None before processing
if first is None:
return second
if second is None:
return first
if first.description_type == second.description_type:
# Same MIME types, can merge content
value = let_user_choose(first.value, second.value)
description_type = first.description_type
else:
# MIME types are different, set MIME type to text
description_type = 'text/enriched'
value = """
Original MIME-type for first description: '{0}'.
{1}
----
Original MIME-type for second description: '{2}'.
{3}
""".format(first.description_type, first.value, second.description_type,
second.value)
return Description(value, description_type)
def union_version(first, second):
"""
Union two version objects.
:param first: First version object to union.
:param second: Other version object to union.
:return: New object.
"""
# Check that none of the object is None before processing
if first is None:
return second
if second is None:
return first
value = let_user_choose(first.value, second.value)
comment = let_user_choose(first.comment, second.comment)
return Version(value, comment)
def union_char(lgr, first, second):
"""
Union two chars with same CP.
:param lgr: The produced LGR.
:param first: The first object to union.
:param second: The other object to union.
"""
comment = let_user_choose(first.comment, second.comment)
tags = set.union(set(first.tags), set(second.tags))
lgr.add_cp(first.cp,comment=comment, tag=tags)
for v in set.union(set(first.get_variants()), set(second.get_variants())):
lgr.add_variant(first.cp, v.cp, variant_type=v.type,
when=v.when, not_when=v.not_when,
comment=v.comment)
def intersect_char(lgr, first, second):
"""
Intersect two chars with same CP.
:param lgr: The produced LGR.
:param first: The first object to intersect with.
:param second: The other object to intersect with.
"""
comment = let_user_choose(first.comment, second.comment)
tags = set.intersection(set(first.tags), set(second.tags))
lgr.add_cp(first.cp, comment=comment, tag=tags)
variant_first = {(v.cp, v.when, v.not_when) for v in first.get_variants()}
variant_second = {(v.cp, v.when, v.not_when)
for v in second.get_variants()}
for v in set.intersection(variant_first, variant_second):
lgr.add_variant(first.cp, v[0], when=v[1], not_when=v[2])
def merge_chars(lgr, script, merged_lgr, ref_mapping, previous_scripts):
"""
Merge chars from LGR set.
:param lgr: A LGR from the set
:param script: The LGR script
:param merged_lgr: The merged LGR
:param ref_mapping: The reference mapping from base LGR to new LGR
:param previous_scripts: The scripts that has already been processed
"""
new_variants = []
merged_chars = {char: char for char in merged_lgr.repertoire}
for char in lgr.repertoire:
if len(char.cp) == 1 and lgr.unicode_database is not None:
script_extensions = lgr.unicode_database.get_script_extensions(
char.cp[0])
else:
script_extensions = []
new_tags = set(script + '-' + x if ':' not in x else x
for x in char.tags) | set(script_extensions)
existing_char = None
if char in merged_chars:
existing_char = merged_chars[char]
if existing_char:
# same cp already in LGR
existing_char.comment = let_user_choose(existing_char.comment,
char.comment)
existing_char.tags = list(
set.union(set(existing_char.tags), set(new_tags)))
existing_char.references = set.union(set(existing_char.references),
set(char.references))
# if 2 scripts have different variants on a character, we need to add the variants for script 1 as
# variant on script 2 to keep transitivity (e.g. b is variant of a in script 1, c is variant of a in
# script 2, we need to set b as c variant and conversely). We do that after processing all code points
# as the code point for the new variant may not be in the merged LGR in the current iteration.
new_v1 = set.difference(set(char.get_variants()),
set(existing_char.get_variants()))
new_v2 = set.difference(set(existing_char.get_variants()),
set(char.get_variants()))
# remove cp itself to avoid error with reflexive variants
for v in new_v1:
if v.cp == existing_char.cp:
new_v1.remove(v)
break
for v in new_v2:
if v.cp == existing_char.cp:
new_v2.remove(v)
break
if new_v1 and new_v2:
new_variants.append((new_v1, new_v2))
# add new variants to current code point
# do not keep new_v1 as reflexive variant may have been removed
for v in set.difference(set(char.get_variants()),
set(existing_char.get_variants())):
new_ref = [ref_mapping[script].get(x, x) for x in v.references]
new_when = None
new_not_when = None
if v.when:
new_when = script + '-' + v.when
if v.not_when:
new_not_when = script + '-' + v.not_when
merged_lgr.add_variant(existing_char.cp,
v.cp,
variant_type='blocked',
when=new_when,
not_when=new_not_when,
comment=v.comment,
ref=new_ref)
# existing variants comment or references are not updated as it is not really important
# if when or not-when:
# - if existing cp has no concurrent rule or conversely, keep the rule as is (i.e. if existing cp has
# no rule but cp has one, keep the cp rule with prefixed with the current script)
# - if existing cp has the same when/not-when rules (same name, content is not checked), update cp WLE with
# the prefix from this script
# - if existing cp has a different rule (not the same name), raise an exception
existing_when = existing_char.when
existing_not_when = existing_char.not_when
# retrieve WLE names
for other_script in reversed(previous_scripts):
if existing_char.when:
existing_when = re.sub(r'^{}-'.format(other_script), '',
existing_when)
if existing_char.not_when:
existing_not_when = re.sub(r'^{}-'.format(other_script),
'', existing_not_when)
if char.when:
if not existing_when:
existing_char.when = script + '-' + char.when
elif existing_when == char.when:
existing_char.when = script + '-' + existing_char.when
# add a merged rule
matching_script = re.sub(r'-{}$'.format(existing_when), '',
existing_char.when)
merge_rules(lgr,
matching_script,
merged_lgr,
ref_mapping,
specific=existing_when)
else:
raise CharInvalidContextRule(char.cp, char.when)
if char.not_when:
if not existing_not_when:
existing_char.not_when = script + '-' + char.not_when
elif existing_not_when == char.not_when:
existing_char.not_when = script + '-' + existing_char.not_when
# add a merged rule
matching_script = re.sub(r'-{}$'.format(existing_not_when),
'', existing_char.not_when)
merge_rules(lgr,
matching_script,
merged_lgr,
ref_mapping,
specific=existing_not_when)
else:
raise CharInvalidContextRule(char.cp, char.not_when)
continue
# add new cp in LGR
when = None
not_when = None
if char.when:
when = script + '-' + char.when
if char.not_when:
not_when = script + '-' + char.not_when
new_ref = [
ref_mapping.get(script, {}).get(x, x) for x in char.references
]
merged_lgr.add_cp(char.cp,
comment=char.comment,
ref=new_ref,
tag=list(new_tags),
when=when,
not_when=not_when)
for v in char.get_variants():
when = None
not_when = None
if v.when:
when = script + '-' + v.when
if v.not_when:
not_when = script + '-' + v.not_when
new_ref = [ref_mapping[script].get(r, r) for r in v.references]
merged_lgr.add_variant(char.cp,
v.cp,
variant_type='blocked',
comment=v.comment,
ref=new_ref,
when=when,
not_when=not_when)
# handle transitivity for variants that differ between scripts
for var1_list, var2_list in new_variants:
for v1 in var1_list:
for v2 in var2_list:
merged_lgr.add_variant(
v1.cp,
v2.cp,
variant_type='blocked',
comment='New variant for merge to keep transitivity')
merged_lgr.add_variant(
v2.cp,
v1.cp,
variant_type='blocked',
comment='New variant for merge to keep transitivity')