Question

我想使用 JAVA 在JSON树中用_RARE_替换罕见字词。

我的罕见词汇列表包含

late  
populate
convicts

所以对于下面的JSON

["S", ["PP", ["ADP", "In"], ["NP", ["DET", "the"], ["NP", ["ADJ", "late"], ["NOUN", "1700<s"]]]], ["S", ["NP", ["ADJ", "British"], ["NOUN", "convicts"]], ["S", ["VP", ["VERB", "were"], ["VP", ["VERB", "used"], ["S+VP", ["PRT", "to"], ["VP", ["VERB", "populate"], ["WHNP", ["DET", "which"], ["NOUN", "colony"]]]]]], [".", "?"]]]]

我应该

["S", ["PP", ["ADP", "In"], ["NP", ["DET", "the"], ["NP", ["ADJ", "_RARE_"], ["NOUN", "1700<s"]]]], ["S", ["NP", ["ADJ", "British"], ["NOUN", "_RARE_"]], ["S", ["VP", ["VERB", "were"], ["VP", ["VERB", "used"], ["S+VP", ["PRT", "to"], ["VP", ["VERB", "populate"], ["WHNP", ["DET", "which"], ["NOUN", "colony"]]]]]], [".", "?"]]]]

注意

["ADJ","late"]

被

取代

["ADJ","_RARE_"]

到目前为止我的代码如下：

我递归迭代树，一旦找到罕见的单词，我就创建一个新的JSON数组，并尝试用它替换现有树的节点。请参阅下面的// this Doesn't work，这就是我遇到的问题。树在此功能之外保持不变。

public static void traverseTreeAndReplaceWithRare(JsonArray tree){   

        //System.out.println(tree.getAsJsonArray()); 

        for (int x = 0; x < tree.getAsJsonArray().size(); x++)
        {
            if(!tree.get(x).isJsonArray())
            {
                if(tree.size()==2)
                {   
                //beware it will get here twice for same word
                 String word= tree.get(1).toString();  
                 word=word.replaceAll("\"", ""); // removing double quotes

                 if(rareWords.contains(word))
                 {
                 JsonParser parser = new JsonParser();                   

                             //This works perfectly 
                             System.out.println("Orig:"+tree);
                 JsonElement jsonElement = parser.parse("["+tree.get(0)+","+"_RARE_"+"]");

                 JsonArray newRareArray = jsonElement.getAsJsonArray();

                             //This works perfectly 
                             System.out.println("New:"+newRareArray);

                 tree=newRareArray; // this Doesn't work
                 }                 

                }               
                continue;   
            }
            traverseTreeAndReplaceWithRare(tree.get(x).getAsJsonArray());
        }
    }

上面调用的代码，我使用google的gson

JsonParser parser = new JsonParser();
JsonElement jsonElement = parser.parse(strJSON);
JsonArray tree = jsonElement.getAsJsonArray();

Answer 1

这是C ++中的直接方法：

#include <fstream>
#include "JSON.hpp"
#include <boost/algorithm/string/regex.hpp>
#include <boost/range/adaptors.hpp>
#include <boost/phoenix.hpp>

static std::vector<std::wstring> readRareWordList()
{
    std::vector<std::wstring> result;

    std::wifstream ifs("testcases/rarewords.txt");
    std::wstring line;
    while (std::getline(ifs, line))
        result.push_back(std::move(line));

    return result;
}

struct RareWords : boost::static_visitor<> {

    /////////////////////////////////////
    // do nothing by default
    template <typename T> void operator()(T&&) const { /* leave all other things unchanged */ }

    /////////////////////////////////////
    // recurse arrays and objects
    void operator()(JSON::Object& obj) const { 
        for(auto& v : obj.values) {
            //RareWords::operator()(v.first); /* to replace in field names (?!) */
            boost::apply_visitor(*this, v.second);
        }
    }

    void operator()(JSON::Array& arr) const {
        int i = 0;
        for(auto& v : arr.values) {
            if (i++) // skip the first element in all arrays
                boost::apply_visitor(*this, v);
        }
    }

    /////////////////////////////////////
    // do replacements on strings
    void operator()(JSON::String& s) const {
        using namespace boost;

        const static std::vector<std::wstring> rareWords = readRareWordList();
        const static std::wstring replacement = L"__RARE__";

        for (auto&& word : rareWords)
            if (word == s.value)
                s.value = replacement;
    }
};

int main()
{
    auto document = JSON::readFrom(std::ifstream("testcases/test3.json"));

    boost::apply_visitor(RareWords(), document);

    std::cout << document;
}

这假设您想要对所有字符串值进行替换，并且只匹配整个字符串。您可以通过更改正则表达式或正则表达式标记来轻松地使此不区分大小写，匹配字符串内的单词等。稍微调整以回应评论。

包含JSON.hpp / cpp的完整代码在此处：https://github.com/sehe/spirit-v2-json/tree/16093940

如何操作JSON树的叶子

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