使用python正则表达式自动生成android jni方法签名

我使用SWIG为Irrlicht C/C++3D引擎生成了一些本机JNI函数接口，我得到了一堆java代理类和一个中间C/C++文件，这些文件实现了java本机函数来粘合java代理类和Irrlicht C/C++3D引擎

所有java代理类都是在包net.sf.jirr中生成的。生成的java本机方法在net.sf.jirr.JirrJNI类中定义

由于SWIG生成的c/c++jni函数的名称不符合默认的android jni函数调用约定，因此我需要手动将这些java本机方法注册到相应的c/c++jni函数中

i、 e.以生成的java本机方法net.sf.jirr.JirrJNI.SColor_setRed为例： 生成的java本机方法定义为：

public final static native void SColor_setRed(long jarg1, SColor jarg1_, long jarg2);

SWIGEXPORT void JNICALL Java_net_sf_jirr_JirrJNI_SColor_1setRed(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_, jlong jarg2)

#define SET_A_JNI_METHOD(name, signature, func_ptr) \
            { (char*)#name, (char*)signature, (void*)func_ptr }
const char* JNI_REG_CLASS = "net/sf/jirr/JirrJNI";
JNINativeMethod JNI_METHODS[] = { SET_A_JNI_METHOD(SColor_setRed, "(JLnet/sf/jirr/SColor;J)V", Java_net_sf_jirr_JirrJNI_SColor_1setRed), ......};
int JNI_METHODS_COUNT = sizeof(JNI_METHODS) / sizeof(JNI_METHODS[0]);

生成的c/c++jni函数定义为：

public final static native void SColor_setRed(long jarg1, SColor jarg1_, long jarg2);

SWIGEXPORT void JNICALL Java_net_sf_jirr_JirrJNI_SColor_1setRed(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_, jlong jarg2)

#define SET_A_JNI_METHOD(name, signature, func_ptr) \
            { (char*)#name, (char*)signature, (void*)func_ptr }
const char* JNI_REG_CLASS = "net/sf/jirr/JirrJNI";
JNINativeMethod JNI_METHODS[] = { SET_A_JNI_METHOD(SColor_setRed, "(JLnet/sf/jirr/SColor;J)V", Java_net_sf_jirr_JirrJNI_SColor_1setRed), ......};
int JNI_METHODS_COUNT = sizeof(JNI_METHODS) / sizeof(JNI_METHODS[0]);

由于c/c++jni函数不符合android c/c++jni函数调用约定（在这种情况下，生成的c/c++jni函数名应为Java_net_sf_jirr_JirrJNI_SColor_，如果需要在jni_OnLoad函数中注册本机函数的情况下调用，则应设置为Java_net_sf_jirr_JirrJNI_SColor_）

因此，我尝试手动注册本机方法，如下所示：

JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved)
{
    ......
if (!registerNativeMethods(env, JNI_REG_CLASS, (JNINativeMethod*)JNI_METHODS, JNI_METHODS_COUNT)) {
    return -1;
}
/* success -- return valid version number */
result = JNI_VERSION_1_4;

return result;
}

其中，JNI_REG_类、JNI_方法、JNI_方法计数定义为：

public final static native void SColor_setRed(long jarg1, SColor jarg1_, long jarg2);

SWIGEXPORT void JNICALL Java_net_sf_jirr_JirrJNI_SColor_1setRed(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_, jlong jarg2)

#define SET_A_JNI_METHOD(name, signature, func_ptr) \
            { (char*)#name, (char*)signature, (void*)func_ptr }
const char* JNI_REG_CLASS = "net/sf/jirr/JirrJNI";
JNINativeMethod JNI_METHODS[] = { SET_A_JNI_METHOD(SColor_setRed, "(JLnet/sf/jirr/SColor;J)V", Java_net_sf_jirr_JirrJNI_SColor_1setRed), ......};
int JNI_METHODS_COUNT = sizeof(JNI_METHODS) / sizeof(JNI_METHODS[0]);

因此，我需要解析net.sf.jirr.JirrJNI类，并为所有java本机方法生成一组SET_a_JNI_METHOD（……）宏

在这个SET_A_JNI_METHOD宏中，名称部分只是java本机函数名；签名部分符合java jni方法签名标准（在官方java jni参考中解释）；func_ptr部分是添加Java_$（PackageName）u作为前缀，为Java本机方法名的每个部分（不包括类名部分）添加一些索引号（此处用“u”分隔）。 i、 e:

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有没有关于如何使用Python正则表达式完成此操作的提示？

这里有一些解决此问题的总体解决方案。它只是起作用了

#!/usr/bin/env python

#import the necessary modules.
import re #for regular expressions.
import sys #for parsing command line opts.

JNI_CPP_FUNC_PREFIX_INDEX = 1
JNI_METHOD_SIGNATURE_MAP = {
#basic type
'void':'V',
'boolean':'Z',
'int':'I',
'long':'J',
'double':'D',
'float':'F',
'byte':'B',
'char':'C',
'short':'S',
#array type
'int[]':'[I',
'float[]':'[F',
'byte[]':'[B',
'char[]':'[C',
'short[]':'[S',
'double[]':'[D',
'long[]':'[J',
'boolean[]':'[Z',
}

#param type = True; return type = False
def generateJniMethodTypeSignature(type, paramORreturnType = True):
    retParamSignature = None
    if type and type > "":
    try:
        retParamSignature = JNI_METHOD_SIGNATURE_MAP[type]
    except:
        if type == "String" :
            retParamSignature = 'LJava/lang/String'
        else :
            retParamSignature = "Lnet/sf/jirr/" + type
        #if paramORreturnType :
        retParamSignature += ";"

    #print "retParamSignature: "
    #print retParamSignature
    return retParamSignature

#if sys.argv[1]:
#   print "File: %s" % (sys.argv[1])
#   logfile = raw_input("Please input a log file to parse, e.g /var/file: ");
try:
    jniMethodsFilePath = sys.argv[1]
    jniMethodsFile = open(jniMethodsFilePath, "r")

    outputFilePath = sys.argv[2]
    outputFile = open(outputFilePath, "w")

    for eachLine in jniMethodsFile.readlines() :
        eachLine = eachLine.strip()
        #print(eachLine)
    #                                               retType  name space (   param space  )
    regex = re.match('^public\sfinal\sstatic\snative\s(\w+)\s(\w+)(\s)*(\()([^)]*)(\s)*(\))', eachLine)
    if regex:
        #'''
        print "whole match: " + regex.group(0)  #whole match.
        '''
        print "retType: " + regex.group(1)      #retType
        print "name: " + regex.group(2)         #name
        print "left space: "
        print regex.group(3)                    #left space
        print "(: " + regex.group(4)            #(
        print "param: " + regex.group(5)        #param
        print "right space: "
        print regex.group(6)                    #right space
        print "): " + regex.group(7)            #)
        #print eachLine
        '''
        retType = regex.group(1).strip() 
        funcName = regex.group(2).strip()
        param = regex.group(5).strip()
        #java native function name
        command = "SET_A_JNI_METHOD(" + funcName + ", \"("

        #print "param: " + regex.group(5) 
        paramRegex = re.split('\s*,\s*', param)
        if paramRegex:
            for eachParam in paramRegex:
                eachParam = eachParam.strip()
                #print "eachParam: " + eachParam
                eachParamRegex = re.split('\s*', eachParam)
                if eachParamRegex:
                    eachParamType = eachParamRegex[0].strip()
                    #print "eachParamType: " + eachParamType
                    paramTypeSignature = generateJniMethodTypeSignature(eachParamType)
                    if paramTypeSignature:
                        #print "paramTypeSignature: " + paramTypeSignature
                        command = command + paramTypeSignature
            command = command + ")"
            retTypeSignature = generateJniMethodTypeSignature(retType, False)
            if retTypeSignature:
                #parameter type signature.
                command = command + retTypeSignature + "\", "
                #print "command: " + command
            #c/c++ jni function name
            funcNameRegex = re.split('_', funcName)
            if funcNameRegex:
                #print cppFuncNameRegex
                i = 0
                cppFuncName = "Java_net_sf_jirr_JirrJNI_"

                for eachFuncNamePart in funcNameRegex:
                    #print eachFuncNamePart
                    i = i + 1
                    if i == 1:
                        cppFuncName = cppFuncName + eachFuncNamePart
                        if i != len(funcNameRegex):
                            cppFuncName = cppFuncName + '_'
                        continue
                    cppFuncName = cppFuncName + str(JNI_CPP_FUNC_PREFIX_INDEX) + eachFuncNamePart
                    if i != len(funcNameRegex) :
                        cppFuncName = cppFuncName + '_'

                command = command + cppFuncName + "), "
                print "output: " + command + "\n"
                outputFile.write(command + '\n')
    outputFile.close()
    jniMethodsFile.close()          
except IOError, (errno, strerror):
    print "I/O Error(%s) : %s" % (errno, strerror)

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为了更好地理解你的问题，我对你的问题做了一些整理，我认为我们还有很多需要知道的。我认为您希望从Java函数声明和类名生成

SET\u A\u JNI\u方法

行，但我无法确切地看到签名或函数ptr是如何派生的（尤其是

SColor\u 1setRed

部分）。请概括地描述一下你所说的，我也不明白。SWIG应该为您处理所有这些问题，在C++和java方面都生成包装功能。我用更详细的信息编辑了我的问题。