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mcstructs.py
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mcstructs.py
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import os
import re
import subprocess
via_nbt_version = '5.0.0'
version_prefix = '5'
# All of this would work better with bytecode rewriting, but here we go
replacements = {
# Gradle build script changes (less chance of running into conflicts by putting it here instead of the patch)
'name = "lenni0451"': 'name = "viaversion"',
'url = "https://maven.lenni0451.net/everything"': 'url = "https://repo.viaversion.com/"',
'api project(":MCStructs-nbt")': f'api "com.viaversion:nbt:{via_nbt_version}"',
'maven_group=net.lenni0451.mcstructs': 'maven_group=com.viaversion.mcstructs',
'maven_version=': f'maven_version={version_prefix}-',
# Code changes
'import net.lenni0451.mcstructs.nbt.tags.': 'import com.viaversion.nbt.tag.',
'import net.lenni0451.mcstructs.nbt.': 'import com.viaversion.nbt.tag.',
'INbtTag': 'Tag',
'INbtNumber': 'NumberTag',
'tag.getNbtType()': 'tag',
'ArrayTag.getLength()': 'ArrayTag.length()',
'type.name()': 'type.getClass().getSimpleName()',
'NbtType': 'Tag',
'import com.viaversion.nbt.tag.Tag': 'import com.viaversion.nbt.tag.*',
'import com.viaversion.nbt.tag.CompoundTag': 'import com.viaversion.nbt.tag.*',
# A special one
' if (!list.canAdd(tag)) throw new SNbtDeserializeException("Unable to insert " + tag.getClass().getSimpleName() + " into ListTag of type " + list.getType().name());': ''
}
# Apply these separately to avoid changing json calls
extra_replacements = {
'.addString(': '.putString(',
'.addBoolean(': '.putBoolean(',
'.addByte(': '.putByte(',
'.addLong(': '.putLong(',
'.addInt(': '.putInt(',
'.addDouble(': '.putDouble(',
'.addShort(': '.putShort(',
'.addCompound(': '.put(',
'.addAll(': '.putAll(',
'.getTag().name()': '.getClass()',
'tag.name()': 'tag.getClass()',
'list.getType().isNumber()': 'list.getElementType().isAssignableFrom(com.viaversion.nbt.tag.NumberTag.class)',
'values.get(i).asNumberTag().intValue()': '((NumberTag) values.get(i)).asInt()',
'this.styleSerializer.serialize(object.getStyle()).asCompoundTag()': '(CompoundTag) this.styleSerializer.serialize(object.getStyle())',
'JsonNbtConverter.toNbt(json).asCompoundTag()': '((CompoundTag) JsonNbtConverter.toNbt(json))',
'Tag.COMPOUND.equals(list.getType())': 'CompoundTag.class == list.getElementType()',
'Tag.COMPOUND.equals(listTag.getType())': 'CompoundTag.class == listTag.getElementType()',
'compound.add(': 'compound.put(',
'.numberValue()': '.getValue()',
'(ACTION)': '("action")',
'(CONTENTS, ': '("contents", ',
'(CONTENTS)': '("contents")',
'tags.get(0).getTag()': 'tags.get(0)',
# Special ones
'!type.equals(tags.get(i).getTag())': "type.getClass() != tags.get(i).getClass()",
'String type = ((StringTag) tag.get("type")).getValue()': 'String type = tag.contains("type") ? ((StringTag) tag.get("type")).getValue() : null'
}
def main():
os.chdir('MCStructs')
handle_file('build.gradle')
handle_file('gradle.properties')
deep('MCStructs-snbt')
deep('MCStructs-text')
# Apply additional manual changes
apply_patch('../patch.patch')
def apply_patch(patch_file):
try:
subprocess.run(['git', 'apply', '--reject', '--ignore-whitespace', '--ignore-space-change', patch_file],
check=True)
print('Applied patch')
except subprocess.CalledProcessError as e:
print(f'Error applying patch: {e}')
def deep(path):
for p in os.listdir(path):
p = os.path.join(path, p)
if os.path.isdir(p):
deep(p)
elif p.endswith(".java") or p.endswith(".gradle"):
handle_file(p)
def to_camel_case(s):
words = s.split('_')
camel_case_words = [words[0].capitalize()] + [word.capitalize() for word in words[1:]]
return ''.join(camel_case_words)
def replace_get_value(content, obj):
# First apply nullable replacements with the generic replacement, THEN the rest
content = replace_nullable_get(obj, 'Compound', '', 'null', content)
content = replace_nullable_get(obj, 'List', '', 'null', content)
content = re.sub(fr'{obj}\.get(\w+)\(([^,)]+), null\)',
fr'({obj}.get(\2) instanceof \1Tag ? ((\1Tag) {obj}.get(\2)).getValue() : null)',
content)
content = replace_nonnull_get(obj, 'Compound', '', 'new CompoundTag()', content)
content = replace_nonnull_get(obj, 'List', '', 'new ListTag<>()', content)
content = replace_nonnull_get(obj, 'String', '.getValue()', '""', content)
content = replace_nonnull_get(obj, 'ByteArray', '.getValue()', 'new byte[0]', content)
content = replace_nonnull_get(obj, 'IntArray', '.getValue()', 'new int[0]', content)
content = replace_nonnull_get(obj, 'LongArray', '.getValue()', 'new long[0]', content)
# Booleans are stored as byte tags
content = re.sub(fr'{obj}\.getBoolean\(([^)]+)\)',
fr'({obj}.get(\1) instanceof ByteTag ? ((ByteTag) {obj}.get(\1)).asBoolean() : false)',
content)
# something.get(y).asXTag() -> ((XTag) something.get(y))
content = re.sub(fr'{obj}\.get\(([^)]+)\).as(\w+Tag)\(\)',
fr'((\2) {obj}.get(\1))',
content)
numeric_types = {'Byte', 'Short', 'Int', 'Long', 'Float', 'Double'}
for numeric_type in numeric_types:
content = replace_nonnull_get(obj, numeric_type, f'.as{numeric_type}()', '0', content)
return content
def replace_nullable_get(obj, tag_type, value_method, default, content):
pattern = re.compile(fr'{obj}\.get{tag_type}\(([^,)]+), null\)')
replacement = fr'({obj}.get(\1) instanceof {tag_type}Tag ? (({tag_type}Tag) {obj}.get(\1)){value_method} : {default})'
return pattern.sub(replacement, content)
def replace_nonnull_get(obj, tag_type, value_method, default, content):
pattern = re.compile(fr'{obj}\.get{tag_type}\(([^)]+)\)')
replacement = fr'({obj}.get(\1) instanceof {tag_type}Tag ? (({tag_type}Tag) {obj}.get(\1)){value_method} : {default})'
return pattern.sub(replacement, content)
def handle_file(path):
with open(path, 'r') as file:
content = file.read()
changed_content = content
for old, new in replacements.items():
changed_content = changed_content.replace(old, new)
name = os.path.basename(path)
if 'CompoundTag ' in changed_content:
# Some are very explicit, so that they don't break random code elsewhere/make it look like it worked fine
for old, new in extra_replacements.items():
changed_content = changed_content.replace(old, new)
if 'JsonHoverEventSerializer' not in name:
changed_content = changed_content.replace('.add("', '.put("')
# tag.isXTag() -> (tag instanceof XTag)
changed_content = re.sub(r'(\w+)\.is(\w+Tag)\(\)', r'(\1 instanceof \2)', changed_content)
# asXTag() -> cast
changed_content = re.sub(r'(\w+)\.as(\w+Tag)\(\)', r'((\2) \1)', changed_content)
changed_content = re.sub(r'tags.get\(i\)\.as(\w+Tag)\(\)', r'((\1) tags.get(i))', changed_content)
# tag.contains(s, Tag.X) -> tag.get(s) instanceof XTag
changed_content = re.sub(r'(\w+)\.contains\(([^,)]+), Tag\.(\w+)\)',
lambda m: f'({m.group(1)}.get({m.group(2)}) instanceof {to_camel_case(m.group(3))}Tag)',
changed_content)
changed_content = re.sub(r'\.contains\(([^,)]+), Tag\.(\w+)\)',
lambda m: f'.get({m.group(1)}) instanceof {to_camel_case(m.group(2))}Tag',
changed_content)
# Tag.X.equals(tagType) -> tagType instance XTag
changed_content = re.sub(r'Tag\.(\w+).equals\((\w+)\)',
lambda m: f'({m.group(2)} instanceof {to_camel_case(m.group(1))}Tag)',
changed_content)
# tag.getX -> cast to tag with default value
changed_content = replace_get_value(changed_content, 'tag')
changed_content = replace_get_value(changed_content, 'rawTag')
changed_content = replace_get_value(changed_content, 'rawEntity')
changed_content = replace_get_value(changed_content, 'score')
changed_content = replace_get_value(changed_content, 'clickEvent')
changed_content = replace_get_value(changed_content, 'parsed')
if content == changed_content:
return
with open(path, 'w') as file:
file.write(changed_content)
print('Wrote to', path)
if __name__ == '__main__':
main()