mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Marc-André Lureau](/assets/img/avatar_default.png)
gdbus-codegen doesn't support conditions or pre-processing. Rather than duplicating D-Bus interfaces for win32 adaptation, let's have a preprocess step, so we can have platform-specific interfaces. The python script is based on https://github.com/peitaosu/XML-Preprocessor, with bug fixes, some testing and replacing lxml dependency with the built-in xml module. This preprocessing syntax style is not very common, but is similar to the one provided by WiX (https://wixtoolset.org/docs/v3/overview/preprocessor/) or wixl, that we adopted in QEMU for packaging the guest agent. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20230606115658.677673-5-marcandre.lureau@redhat.com>
294 lines
8.9 KiB
Python
Executable file
294 lines
8.9 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
#
|
|
# Copyright (c) 2017-2019 Tony Su
|
|
# Copyright (c) 2023 Red Hat, Inc.
|
|
#
|
|
# SPDX-License-Identifier: MIT
|
|
#
|
|
# Adapted from https://github.com/peitaosu/XML-Preprocessor
|
|
#
|
|
"""This is a XML Preprocessor which can be used to process your XML file before
|
|
you use it, to process conditional statements, variables, iteration
|
|
statements, error/warning, execute command, etc.
|
|
|
|
## XML Schema
|
|
|
|
### Include Files
|
|
```
|
|
<?include path/to/file ?>
|
|
```
|
|
|
|
### Variables
|
|
```
|
|
$(env.EnvironmentVariable)
|
|
|
|
$(sys.SystemVariable)
|
|
|
|
$(var.CustomVariable)
|
|
```
|
|
|
|
### Conditional Statements
|
|
```
|
|
<?if ?>
|
|
|
|
<?ifdef ?>
|
|
|
|
<?ifndef ?>
|
|
|
|
<?else?>
|
|
|
|
<?elseif ?>
|
|
|
|
<?endif?>
|
|
```
|
|
|
|
### Iteration Statements
|
|
```
|
|
<?foreach VARNAME in 1;2;3?>
|
|
$(var.VARNAME)
|
|
<?endforeach?>
|
|
```
|
|
|
|
### Errors and Warnings
|
|
```
|
|
<?error "This is error message!" ?>
|
|
|
|
<?warning "This is warning message!" ?>
|
|
```
|
|
|
|
### Commands
|
|
```
|
|
<? cmd "echo hello world" ?>
|
|
```
|
|
"""
|
|
|
|
import os
|
|
import platform
|
|
import re
|
|
import subprocess
|
|
import sys
|
|
from typing import Optional
|
|
from xml.dom import minidom
|
|
|
|
|
|
class Preprocessor():
|
|
"""This class holds the XML preprocessing state"""
|
|
|
|
def __init__(self):
|
|
self.sys_vars = {
|
|
"ARCH": platform.architecture()[0],
|
|
"SOURCE": os.path.abspath(__file__),
|
|
"CURRENT": os.getcwd(),
|
|
}
|
|
self.cus_vars = {}
|
|
|
|
def _pp_include(self, xml_str: str) -> str:
|
|
include_regex = r"(<\?include([\w\s\\/.:_-]+)\s*\?>)"
|
|
matches = re.findall(include_regex, xml_str)
|
|
for group_inc, group_xml in matches:
|
|
inc_file_path = group_xml.strip()
|
|
with open(inc_file_path, "r", encoding="utf-8") as inc_file:
|
|
inc_file_content = inc_file.read()
|
|
xml_str = xml_str.replace(group_inc, inc_file_content)
|
|
return xml_str
|
|
|
|
def _pp_env_var(self, xml_str: str) -> str:
|
|
envvar_regex = r"(\$\(env\.(\w+)\))"
|
|
matches = re.findall(envvar_regex, xml_str)
|
|
for group_env, group_var in matches:
|
|
xml_str = xml_str.replace(group_env, os.environ[group_var])
|
|
return xml_str
|
|
|
|
def _pp_sys_var(self, xml_str: str) -> str:
|
|
sysvar_regex = r"(\$\(sys\.(\w+)\))"
|
|
matches = re.findall(sysvar_regex, xml_str)
|
|
for group_sys, group_var in matches:
|
|
xml_str = xml_str.replace(group_sys, self.sys_vars[group_var])
|
|
return xml_str
|
|
|
|
def _pp_cus_var(self, xml_str: str) -> str:
|
|
define_regex = r"(<\?define\s*(\w+)\s*=\s*([\w\s\"]+)\s*\?>)"
|
|
matches = re.findall(define_regex, xml_str)
|
|
for group_def, group_name, group_var in matches:
|
|
group_name = group_name.strip()
|
|
group_var = group_var.strip().strip("\"")
|
|
self.cus_vars[group_name] = group_var
|
|
xml_str = xml_str.replace(group_def, "")
|
|
cusvar_regex = r"(\$\(var\.(\w+)\))"
|
|
matches = re.findall(cusvar_regex, xml_str)
|
|
for group_cus, group_var in matches:
|
|
xml_str = xml_str.replace(
|
|
group_cus,
|
|
self.cus_vars.get(group_var, "")
|
|
)
|
|
return xml_str
|
|
|
|
def _pp_foreach(self, xml_str: str) -> str:
|
|
foreach_regex = r"(<\?foreach\s+(\w+)\s+in\s+([\w;]+)\s*\?>(.*)<\?endforeach\?>)"
|
|
matches = re.findall(foreach_regex, xml_str)
|
|
for group_for, group_name, group_vars, group_text in matches:
|
|
group_texts = ""
|
|
for var in group_vars.split(";"):
|
|
self.cus_vars[group_name] = var
|
|
group_texts += self._pp_cus_var(group_text)
|
|
xml_str = xml_str.replace(group_for, group_texts)
|
|
return xml_str
|
|
|
|
def _pp_error_warning(self, xml_str: str) -> str:
|
|
error_regex = r"<\?error\s*\"([^\"]+)\"\s*\?>"
|
|
matches = re.findall(error_regex, xml_str)
|
|
for group_var in matches:
|
|
raise RuntimeError("[Error]: " + group_var)
|
|
warning_regex = r"(<\?warning\s*\"([^\"]+)\"\s*\?>)"
|
|
matches = re.findall(warning_regex, xml_str)
|
|
for group_wrn, group_var in matches:
|
|
print("[Warning]: " + group_var)
|
|
xml_str = xml_str.replace(group_wrn, "")
|
|
return xml_str
|
|
|
|
def _pp_if_eval(self, xml_str: str) -> str:
|
|
ifelif_regex = (
|
|
r"(<\?(if|elseif)\s*([^\"\s=<>!]+)\s*([!=<>]+)\s*\"*([^\"=<>!]+)\"*\s*\?>)"
|
|
)
|
|
matches = re.findall(ifelif_regex, xml_str)
|
|
for ifelif, tag, left, operator, right in matches:
|
|
if "<" in operator or ">" in operator:
|
|
result = eval(f"{left} {operator} {right}")
|
|
else:
|
|
result = eval(f'"{left}" {operator} "{right}"')
|
|
xml_str = xml_str.replace(ifelif, f"<?{tag} {result}?>")
|
|
return xml_str
|
|
|
|
def _pp_ifdef_ifndef(self, xml_str: str) -> str:
|
|
ifndef_regex = r"(<\?(ifdef|ifndef)\s*([\w]+)\s*\?>)"
|
|
matches = re.findall(ifndef_regex, xml_str)
|
|
for group_ifndef, group_tag, group_var in matches:
|
|
if group_tag == "ifdef":
|
|
result = group_var in self.cus_vars
|
|
else:
|
|
result = group_var not in self.cus_vars
|
|
xml_str = xml_str.replace(group_ifndef, f"<?if {result}?>")
|
|
return xml_str
|
|
|
|
def _pp_if_elseif(self, xml_str: str) -> str:
|
|
if_elif_else_regex = (
|
|
r"(<\?if\s(True|False)\?>"
|
|
r"(.*?)"
|
|
r"<\?elseif\s(True|False)\?>"
|
|
r"(.*?)"
|
|
r"<\?else\?>"
|
|
r"(.*?)"
|
|
r"<\?endif\?>)"
|
|
)
|
|
if_else_regex = (
|
|
r"(<\?if\s(True|False)\?>"
|
|
r"(.*?)"
|
|
r"<\?else\?>"
|
|
r"(.*?)"
|
|
r"<\?endif\?>)"
|
|
)
|
|
if_regex = r"(<\?if\s(True|False)\?>(.*?)<\?endif\?>)"
|
|
matches = re.findall(if_elif_else_regex, xml_str, re.DOTALL)
|
|
for (group_full, group_if, group_if_elif, group_elif,
|
|
group_elif_else, group_else) in matches:
|
|
result = ""
|
|
if group_if == "True":
|
|
result = group_if_elif
|
|
elif group_elif == "True":
|
|
result = group_elif_else
|
|
else:
|
|
result = group_else
|
|
xml_str = xml_str.replace(group_full, result)
|
|
matches = re.findall(if_else_regex, xml_str, re.DOTALL)
|
|
for group_full, group_if, group_if_else, group_else in matches:
|
|
result = ""
|
|
if group_if == "True":
|
|
result = group_if_else
|
|
else:
|
|
result = group_else
|
|
xml_str = xml_str.replace(group_full, result)
|
|
matches = re.findall(if_regex, xml_str, re.DOTALL)
|
|
for group_full, group_if, group_text in matches:
|
|
result = ""
|
|
if group_if == "True":
|
|
result = group_text
|
|
xml_str = xml_str.replace(group_full, result)
|
|
return xml_str
|
|
|
|
def _pp_command(self, xml_str: str) -> str:
|
|
cmd_regex = r"(<\?cmd\s*\"([^\"]+)\"\s*\?>)"
|
|
matches = re.findall(cmd_regex, xml_str)
|
|
for group_cmd, group_exec in matches:
|
|
output = subprocess.check_output(
|
|
group_exec, shell=True,
|
|
text=True, stderr=subprocess.STDOUT
|
|
)
|
|
xml_str = xml_str.replace(group_cmd, output)
|
|
return xml_str
|
|
|
|
def _pp_blanks(self, xml_str: str) -> str:
|
|
right_blank_regex = r">[\n\s\t\r]*"
|
|
left_blank_regex = r"[\n\s\t\r]*<"
|
|
xml_str = re.sub(right_blank_regex, ">", xml_str)
|
|
xml_str = re.sub(left_blank_regex, "<", xml_str)
|
|
return xml_str
|
|
|
|
def preprocess(self, xml_str: str) -> str:
|
|
fns = [
|
|
self._pp_blanks,
|
|
self._pp_include,
|
|
self._pp_foreach,
|
|
self._pp_env_var,
|
|
self._pp_sys_var,
|
|
self._pp_cus_var,
|
|
self._pp_if_eval,
|
|
self._pp_ifdef_ifndef,
|
|
self._pp_if_elseif,
|
|
self._pp_command,
|
|
self._pp_error_warning,
|
|
]
|
|
|
|
while True:
|
|
changed = False
|
|
for func in fns:
|
|
out_xml = func(xml_str)
|
|
if not changed and out_xml != xml_str:
|
|
changed = True
|
|
xml_str = out_xml
|
|
if not changed:
|
|
break
|
|
|
|
return xml_str
|
|
|
|
|
|
def preprocess_xml(path: str) -> str:
|
|
with open(path, "r", encoding="utf-8") as original_file:
|
|
input_xml = original_file.read()
|
|
|
|
proc = Preprocessor()
|
|
return proc.preprocess(input_xml)
|
|
|
|
|
|
def save_xml(xml_str: str, path: Optional[str]):
|
|
xml = minidom.parseString(xml_str)
|
|
with open(path, "w", encoding="utf-8") if path else sys.stdout as output_file:
|
|
output_file.write(xml.toprettyxml())
|
|
|
|
|
|
def main():
|
|
if len(sys.argv) < 2:
|
|
print("Usage: xml-preprocessor input.xml [output.xml]")
|
|
sys.exit(1)
|
|
|
|
output_file = None
|
|
if len(sys.argv) == 3:
|
|
output_file = sys.argv[2]
|
|
|
|
input_file = sys.argv[1]
|
|
output_xml = preprocess_xml(input_file)
|
|
save_xml(output_xml, output_file)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|