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