1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283 |
- # Copyright (C) 2020 The Android Open Source Project
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- #
- """This file reads entries from a Ninja rsp file."""
- class NinjaRspFileReader:
- """
- Reads entries from a Ninja rsp file. Ninja escapes any entries in the file that contain a
- non-standard character by surrounding the whole entry with single quotes, and then replacing
- any single quotes in the entry with the escape sequence '\''.
- """
- def __init__(self, filename):
- self.f = open(filename, 'r')
- self.r = self.character_reader(self.f)
- def __iter__(self):
- return self
- def character_reader(self, f):
- """Turns a file into a generator that returns one character at a time."""
- while True:
- c = f.read(1)
- if c:
- yield c
- else:
- return
- def __next__(self):
- entry = self.read_entry()
- if entry:
- return entry
- else:
- raise StopIteration
- def read_entry(self):
- c = next(self.r, "")
- if not c:
- return ""
- elif c == "'":
- return self.read_quoted_entry()
- else:
- entry = c
- for c in self.r:
- if c == " " or c == "\n":
- break
- entry += c
- return entry
- def read_quoted_entry(self):
- entry = ""
- for c in self.r:
- if c == "'":
- # Either the end of the quoted entry, or the beginning of an escape sequence, read the next
- # character to find out.
- c = next(self.r)
- if not c or c == " " or c == "\n":
- # End of the item
- return entry
- elif c == "\\":
- # Escape sequence, expect a '
- c = next(self.r)
- if c != "'":
- # Malformed escape sequence
- raise "malformed escape sequence %s'\\%s" % (entry, c)
- entry += "'"
- else:
- raise "malformed escape sequence %s'%s" % (entry, c)
- else:
- entry += c
- raise "unterminated quoted entry %s" % entry
|