我有一些代码(采用并改编自here和here),它使用 libclang来解析Python(Widnows)中的C ++源文件并得到它的所有< em>声明声明,如下所示:
import clang.cindex
def parse_decl(node):
reference_node = node.get_definition()
if node.kind.is_declaration():
print(node.kind, node.kind.name,
node.location.line, ',', node.location.column,
reference_node.displayname)
for ch in node.get_children():
parse_decl(ch)
# configure path
clang.cindex.Config.set_library_file('C:/Program Files (x86)/LLVM/bin/libclang.dll')
index = clang.cindex.Index.create()
trans_unit = index.parse(r'C:\path\to\sourcefile\test.cpp', args=['-std=c++11'])
parse_decl(trans_unit.cursor)
对于以下C ++源文件(test_ok.cpp
):
/* test_ok.cpp
*/
#include <iostream>
#include <fstream>
#include <string>
#include <algorithm>
#include <cmath>
#include <iomanip>
using namespace std;
int main (int argc, char *argv[]) {
int linecount = 0;
double array[1000], sum=0, median=0, add=0;
string filename;
if (argc <= 1)
{
cout << "Error: no filename specified" << endl;
return 0;
}
//program checks if a filename is specified
filename = argv[1];
ifstream myfile (filename.c_str());
if (myfile.is_open())
{
myfile >> array[linecount];
while ( myfile.good() )
{
linecount++;
myfile >> array[linecount];
}
myfile.close();
}
parse
方法按原样解析并输出:
CursorKind.USING_DIRECTIVE USING_DIRECTIVE 10 , 17 std
CursorKind.FUNCTION_DECL FUNCTION_DECL 12 , 5 main(int, char **)
CursorKind.PARM_DECL PARM_DECL 12 , 15 argc
CursorKind.PARM_DECL PARM_DECL 12 , 27 argv
CursorKind.VAR_DECL VAR_DECL 13 , 7 linecount
CursorKind.VAR_DECL VAR_DECL 14 , 10 array
CursorKind.VAR_DECL VAR_DECL 14 , 23 sum
CursorKind.VAR_DECL VAR_DECL 14 , 30 median
CursorKind.VAR_DECL VAR_DECL 14 , 40 add
CursorKind.VAR_DECL VAR_DECL 15 , 10 filename
CursorKind.VAR_DECL VAR_DECL 23 , 12 myfile
Process finished with exit code 0
无论其,
以下C ++源文件(test.cpp
):
/* test.cpp
*/
#include <iostream>
#include <vector>
#include <fstream>
#include <cmath>
#include <algorithm>
#include <iomanip>
using namespace std;
void readfunction(vector<double>& numbers, ifstream& myfile)
{
double number;
while (myfile >> number) {
numbers.push_back(number);}
}
double meanfunction(vector<double>& numbers)
{
double total=0;
vector<double>::const_iterator i;
for (i=numbers.begin(); i!=numbers.end(); ++i) {
total +=*i; }
return total/numbers.size();
}
解析不完整:
CursorKind.USING_DIRECTIVE USING_DIRECTIVE 8 , 17 std
CursorKind.VAR_DECL VAR_DECL 10 , 6 readfunction
Process finished with exit code 0
解析无法处理vector<double>& numbers
等行,并停止解析该部分代码。
我认为这个问题与另一个SO question中描述的问题类似。我试图明确使用std=c++11
解析参数但没有成功。在问题的answer中(即使它没有解决问题)也建议使用-x c++
,但我不知道如何在我的代码中添加
任何人都可以指出libclang的解决方案来解析像test.cpp
中那样的C ++语句?
另外,我可以这样做,所以它会继续解析,即使它到达一个令牌无法解析吗?
答案 0 :(得分:3)
默认情况下,libclang不会添加编译器系统包含路径。
始终确保您已检查过诊断程序 - 如编译器错误消息,它们倾向于指示如何解决任何问题。在这种情况下,显然存在一个包含问题:
<Diagnostic severity 4, location <SourceLocation file 'test.cpp', line 3, column 10>, spelling "'iostream' file not found">
如果确保libclang添加了这些路径,它应该开始工作。
This question包含解决此问题的方法。这似乎是Stackoverflow上反复出现的主题,所以我写了ccsyspath来帮助在OSX,Linux和Windows上找到这些路径。稍微简化您的代码:
import clang.cindex
clang.cindex.Config.set_library_file('C:/Program Files (x86)/LLVM/bin/libclang.dll')
import ccsyspath
index = clang.cindex.Index.create()
args = '-x c++ --std=c++11'.split()
syspath = ccsyspath.system_include_paths('clang++')
incargs = [ b'-I' + inc for inc in syspath ]
args = args + incargs
trans_unit = index.parse('test.cpp', args=args)
for node in trans_unit.cursor.walk_preorder():
if node.location.file is None:
continue
if node.location.file.name != 'test.cpp':
continue
if node.kind.is_declaration():
print(node.kind, node.location)
我的args
最终成为:
['-x',
'c++',
'--std=c++11',
'-IC:\\Program Files (x86)\\LLVM\\bin\\..\\lib\\clang\\3.8.0\\include',
'-IC:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\include',
'-IC:\\Program Files (x86)\\Windows Kits\\8.1\\include\\shared',
'-IC:\\Program Files (x86)\\Windows Kits\\8.1\\include\\um',
'-IC:\\Program Files (x86)\\Windows Kits\\8.1\\include\\winrt']
,输出为:
(CursorKind.USING_DIRECTIVE, <SourceLocation file 'test.cpp', line 10, column 17>)
(CursorKind.FUNCTION_DECL, <SourceLocation file 'test.cpp', line 12, column 6>)
(CursorKind.PARM_DECL, <SourceLocation file 'test.cpp', line 12, column 35>)
(CursorKind.PARM_DECL, <SourceLocation file 'test.cpp', line 12, column 54>)
(CursorKind.VAR_DECL, <SourceLocation file 'test.cpp', line 15, column 14>)
(CursorKind.FUNCTION_DECL, <SourceLocation file 'test.cpp', line 21, column 8>)
(CursorKind.PARM_DECL, <SourceLocation file 'test.cpp', line 21, column 37>)
(CursorKind.VAR_DECL, <SourceLocation file 'test.cpp', line 24, column 14>)
(CursorKind.VAR_DECL, <SourceLocation file 'test.cpp', line 25, column 40>)