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simplecpp: keep blank lines

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This commit is contained in:
Mike Swanson 2019-09-01 17:24:25 -07:00
parent 6b8397dc0d
commit d4c5b3ab48
1 changed files with 95 additions and 82 deletions
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45
scripts/simplecpp
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@ -35,26 +35,31 @@ debug = False
defines = {} defines = {}
command_re = re.compile("\#(\w+)(\s+(.*))?") command_re = re.compile("\#(\w+)(\s+(.*))?")
include_re = re.compile("\s*\"(.*)\"\s*") include_re = re.compile('\s*"(.*)"\s*')
def debug_msg(message): def debug_msg(message):
if debug: if debug:
sys.stderr.write(message) sys.stderr.write(message)
# Parse command line options # Parse command line options
def parse_cmdline(): def parse_cmdline():
for arg in sys.argv[1:]: for arg in sys.argv[1:]:
if arg.startswith("-D"): if arg.startswith("-D"):
name = arg[2:] name = arg[2:]
defines[name] = True defines[name] = True
def parse_stream(stream): def parse_stream(stream):
result = read_block(stream, False) result = read_block(stream, False)
if result is not None: if result is not None:
raise Exception("Mismatched #if in '%s'" % stream.name) raise Exception("Mismatched #if in '%s'" % stream.name)
def parse_file(filename): def parse_file(filename):
f = open(filename) f = open(filename)
@ -63,8 +68,10 @@ def parse_file(filename):
finally: finally:
f.close() f.close()
# #include # #include
def cmd_include(arg): def cmd_include(arg):
# Extract the filename # Extract the filename
@ -79,19 +86,25 @@ def cmd_include(arg):
parse_file(filename) parse_file(filename)
# #define # #define
def cmd_define(arg): def cmd_define(arg):
defines[arg] = True defines[arg] = True
# #undef # #undef
def cmd_undef(arg): def cmd_undef(arg):
if arg in defines: if arg in defines:
del defines[arg] del defines[arg]
# #ifdef/#ifndef # #ifdef/#ifndef
def cmd_ifdef(arg, command, stream, ignore): def cmd_ifdef(arg, command, stream, ignore):
# Get the define name # Get the define name
@ -101,7 +114,7 @@ def cmd_ifdef(arg, command, stream, ignore):
# Should we ignore the contents of this block? # Should we ignore the contents of this block?
sub_ignore = (name not in defines) sub_ignore = name not in defines
if "n" in command: if "n" in command:
sub_ignore = not sub_ignore sub_ignore = not sub_ignore
@ -124,19 +137,21 @@ def cmd_ifdef(arg, command, stream, ignore):
if result != "endif": if result != "endif":
raise Exception("'if' block did not end in an 'endif'") raise Exception("'if' block did not end in an 'endif'")
commands = { commands = {
"include" : cmd_include, "include": cmd_include,
"define" : cmd_define, "define": cmd_define,
"undef" : cmd_undef, "undef": cmd_undef,
"if" : cmd_ifdef, "if": cmd_ifdef,
"ifdef" : cmd_ifdef, "ifdef": cmd_ifdef,
"ifn" : cmd_ifdef, "ifn": cmd_ifdef,
"ifndef" : cmd_ifdef, "ifndef": cmd_ifdef,
} }
# Recursive block reading function # Recursive block reading function
# if 'ignore' argument is 1, contents are ignored # if 'ignore' argument is 1, contents are ignored
def read_block(stream, ignore): def read_block(stream, ignore):
for line in stream: for line in stream:
@ -145,9 +160,10 @@ def read_block(stream, ignore):
line = line[0:-1] line = line[0:-1]
# Ignore empty lines # Ignore, but keep empty lines
if line == " " * len(line): if line == " " * len(line):
print(line)
continue continue
# Check if this line has a command # Check if this line has a command
@ -161,8 +177,7 @@ def read_block(stream, ignore):
if command == "else" or command == "endif": if command == "else" or command == "endif":
return command return command
elif command not in commands: elif command not in commands:
raise Exception("Unknown command: '%s'" % \ raise Exception("Unknown command: '%s'" % command)
command)
# Get the callback function. # Get the callback function.
@ -174,15 +189,13 @@ def read_block(stream, ignore):
# ignoring this block. # ignoring this block.
if func == cmd_ifdef: if func == cmd_ifdef:
cmd_ifdef(arg, command=command, cmd_ifdef(arg, command=command, stream=stream, ignore=ignore)
stream=stream,
ignore=ignore)
elif not ignore: elif not ignore:
func(arg) func(arg)
else: else:
if not ignore: if not ignore:
print(line) print(line)
parse_cmdline() parse_cmdline()
parse_stream(sys.stdin) parse_stream(sys.stdin)