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Copy pathcpp-name-format.py
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executable file
·193 lines (166 loc) · 6.1 KB
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2019-present ScyllaDB
#
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
import argparse
import io
import os
import sys
import os.path as path
import re
from enum import Enum
from collections import deque
ap = argparse.ArgumentParser(description='Pretty-print C++ names.')
ap.add_argument('--indent', dest='indent', default=' ', help='Indentation')
ap.add_argument('--break', dest='maxwidth', default=32, nargs='?', const=1, help='Break tokens longer than this parameter into multiple lines')
ap.add_argument('--debug', dest='debug', type=int, default=0, nargs='?', const=1, help='Debugging level')
ap.add_argument('strings', metavar='S', type=str, nargs='*', help='File(s) or strings to parse')
args = ap.parse_args()
def debug(s, level=1):
if level <= args.debug:
print('DEBUG[{}] {}'.format(level, s))
class Token:
class Type(Enum):
Empty = 0
Word = 1
Space = 2
Comma = 3
Open = 4
Close = 5
Compound = 6
def __init__(self, content, type, depth):
self.content = content
self.type = type
self.depth = depth
self.length = None
def __repr__(self):
return "Token:<{} depth={} len={} content='{}'>".format(self.type, self.depth, self.len(), self.content)
def measure(self):
if self.type != Token.Type.Compound:
return len(self.content)
l = 0
for t in self.content:
l += t.len()
return l
def len(self):
if self.length is None:
self.length = self.measure()
return self.length
def singleline(self):
return (self.type != Token.Type.Compound and self.type != Token.Type.Word) or \
self.len() <= int(args.maxwidth)
def indentation(self, indent=None):
if not indent:
indent = args.indent
return '\n' + indent * self.depth
def format(self, depth=0, nested=False):
debug("Format depth={} nested={} singleline={} {}".format(depth, nested, self.singleline(), self))
s = ''
if self.type != Token.Type.Compound:
if not self.singleline() and nested:
s = self.indentation()
return s + self.content
if self.singleline():
for t in self.content:
s += t.format(depth+1, nested=nested)
return s
last = None
newl = False
indentation = self.indentation()
indent = True
opened = False
for t in self.content:
if t.type == Token.Type.Space and \
(indent or (last and last.type == Token.Type.Comma)):
continue
last = t
if indent and t.type != Token.Type.Comma:
s += indentation
indent = False
s += t.format(depth=depth+1, nested=opened)
if t.type == Token.Type.Comma or (opened and not t.singleline()):
indent = True
if t.type == Token.Type.Open:
opened = True
elif t.type == Token.Type.Close:
opened = False
return s
class Parser:
def __init__(self):
self.delimiters = re.compile(r'(?P<space>\s+)|(?P<open>[\[\(\{<])|(?P<close>[>\}\)\]])|(?P<comma>,)')
self.lex_map = {
'space': Token.Type.Space,
'open': Token.Type.Open,
'close': Token.Type.Close,
'comma': Token.Type.Comma,
}
self.queue = None
def debug_token(self, desc, t, debug_level=2):
debug("{} {}".format(desc, t), debug_level)
return t
def lex(self, line):
depth = 0
while line:
m = self.delimiters.search(line)
if not m:
yield self.debug_token("Yield line", Token(line, Token.Type.Word, depth))
break
if m.start():
yield self.debug_token("Yield", Token(line[:m.start()], Token.Type.Word, depth))
token_type = self.lex_map[m.lastgroup]
if token_type == Token.Type.Close:
depth -= 1
yield self.debug_token("Yield", Token(m[0], token_type, depth))
if token_type == Token.Type.Open:
depth += 1
line = line[m.end():]
def parse_tokens(self, depth=0):
tokens = deque()
while self.queue:
t = self.queue[0]
if t.depth < depth:
if tokens and tokens[len(tokens)-1].type == Token.Type.Space:
tokens.pop()
break
elif t.depth > depth:
t = self.parse_tokens(t.depth)
tokens.append(self.debug_token("Appending nested depth={}".format(depth), t, 3))
else:
self.queue.popleft()
tokens.append(self.debug_token("Appending depth={}".format(depth), t, 3))
if tokens and tokens[0].type == Token.Type.Space:
tokens.popleft()
if tokens and tokens[len(tokens)-1].type == Token.Type.Space:
tokens.pop()
if not tokens:
ret = Token('', Token.Type.Empty, depth)
elif len(tokens) == 1:
ret = tokens[0]
else:
ret = Token(tokens, Token.Type.Compound, depth)
return self.debug_token("Return depth={}".format(depth), ret)
def parse(self, line):
debug("Parse: '{}'".format(line), 1)
self.queue = deque(Token.Parser().lex(line))
return self.parse_tokens()
def parse_line(line):
print(Token.Parser().parse(line).format())
def parse_file(f):
for l in f:
parse_line(l.strip())
if args.strings:
for s in args.strings:
if s == '-':
parse_file(sys.stdin)
elif path.exists(s):
f = open(s, "r")
parse_file(f)
f.close()
else:
parse_line(s)
else:
parse_file(sys.stdin)