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import json
# Parameters.
ALL_ERRORS = False
def _report_error(msg):
'''Report an error.'''
full_msg = 'ERROR: ' + msg
if ALL_ERRORS:
print(full_msg)
else:
raise RuntimeError(full_msg)
class Token(object):
pass
class Output(Token):
def __init__(self, path):
self.path = path
class Input(Token):
def __init__(self, path):
self.path = path
class OrderInput(Token):
def __init__(self, path):
self.path = path
class Colon(Token):
pass
class Append(Token):
pass
class Variable(Token):
def __init__(self, name):
self.name = name
class Word(Token):
def __init__(self, name):
self.name = name
def validate_depfile(depfile, expect_input=None):
'''Validate a depfile contains some information
Returns `False` if the information is not found.
'''
with open(depfile, 'r') as fin:
depfile_content = fin.read()
real_lines = []
join_line = False
for line in depfile_content.split('\n'):
# Join the line if needed.
if join_line:
line = real_lines.pop() + line
# Detect line continuations.
join_line = line.endswith('\\')
# Strip line continuation characters.
if join_line:
line = line[:-1]
# Add to the real line set.
real_lines.append(line)
# Perform tokenization.
tokenized_lines = []
for line in real_lines:
tokenized = []
join_word = False
for word in line.split(' '):
if join_word:
word = tokenized.pop() + ' ' + word
# Detect word joins.
join_word = word.endswith('\\')
# Strip escape character.
if join_word:
word = word[:-1]
# Detect `:` at the end of a word.
if word.endswith(':'):
tokenized.append(word[:-1])
word = word[-1]
# Detect `:` at the end of a word.
if word.endswith(':|'):
tokenized.append(word[:-2])
word = word[-2]
# Add word to the tokenized set.
tokenized.append(word)
tokenized_lines.append(tokenized)
# Parse.
ast = []
for line in tokenized_lines:
kind = None
for token in line:
if token == ':':
kind = 'dependency'
elif token == '+=':
kind = 'append'
elif token == ':|':
kind = 'order-only'
if line == ['']:
kind = 'empty'
if kind is None:
_report_error('unknown line kind: %s' % line)
line_parse = []
if kind == 'dependency':
after_colon = False
for token in line:
if token == ':':
after_colon = True
elif after_colon:
line_parse.append(Input(token))
else:
line_parse.append(Output(token))
elif kind == 'order-only':
after_op = False
for token in line:
if token == ':|':
after_op = True
elif after_op:
line_parse.append(OrderInput(token))
else:
line_parse.append(Output(token))
elif kind == 'append':
after_op = False
for token in line:
if token == '+=':
after_op = True
elif after_op:
line_parse.append(Word(token))
else:
line_parse.append(Variable(token))
ast.append(line_parse)
for node in ast:
for token in node:
if expect_input is not None:
# If the input is found, clear the expectation.
if isinstance(token, Input) and token.path == expect_input:
expect_input = None
result = True
if expect_input:
_report_error('missing input: %s' % expect_input)
result = False
return result
if __name__ == '__main__':
import sys
depfile = None
have_expect = False
expect_input = None
# Parse arguments.
args = sys.argv[1:]
while args:
# Take an argument.
arg = args.pop(0)
# Flag to change how errors are reported.
if arg == '-A' or arg == '--all':
ALL_ERRORS = True
# Required arguments.
elif arg == '-d' or arg == '--depfile':
depfile = args.pop(0)
elif arg == '-i' or arg == '--expect-input':
expect_input = args.pop(0)
have_expect = True
# Validate that we have the required arguments.
if depfile is None:
raise RuntimeError('missing "depfile" file')
if have_expect is None:
raise RuntimeError('missing an "expect" argument')
# Do the actual work.
try:
is_ok = validate_depfile(depfile, expect_input=expect_input)
except BaseException as e:
_report_error('exception: %s' % e)
# Fail if errors are found.
if not is_ok:
sys.exit(1)
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