js-将markdown字符串(仅粗体和斜体)解析为文本+样式jsons数组

问题描述

尝试在javascript中解析一个字符串，该字符串包含标记为*multi word bold*(星号)的粗体注释和标记为_multi word italic_(下划线)的斜体注释.我希望解析器功能支持多个单词注释，粗体中的斜体，斜体中的粗体和混合(请参见示例).

Trying to parse a string in javascript that contains bold annotations, marked as *multi word bold* (asterisk), and italic annotations, marked as _multi word italic_ (underline).
I'd like the parser function to support multi words annotations, italic within bold, bold within italic and mixed (see examples).

以下是一些带有必需输出示例的输入:

Here are some inputs with required outputs examples:

const simpleInput = "The *quick brown fox* jumps _over the lazy dog_";
const simpleOutput =[
    {text: 'The '},
    {text: 'quick brown fox', bold: true},
    {text: ' jumps '},
    {text: 'over the lazy dog', italic: true}
];

const italicWithinBoldInput = "The *quick brown _fox jumps_ over the* lazy dog";
const italicWithinBoldOutput =[
    {text: 'The '},
    {text: 'quick brown ', bold: true},
    {text: 'fox jumps', bold: true, italic: true},
    {text: ' over the', bold: true},
    {text: ' lazy dog'}
];

const mixedInput = "The *quick brown _fox jumps* over the_ lazy dog";
const mixedOutput =[
    {text: 'The '},
    {text: 'quick brown ', bold: true},
    {text: 'fox jumps', bold: true, italic: true},
    {text: ' over the', italic: true},
    {text: ' lazy dog'}
];

我在npm上尝试了一些解析器，但是一切都有些过头了，我所需要的完全没有.

I tried some parsers on npm but everything was a bit of an overkill, nothing was quite what I needed..

推荐答案

您可以通过以下方式完成

You can do it in the following way

function getObject(str){
    let bold = false, italics = false;
    let output = [];
    let text = str.split('').reduce((a, b) => {
        if(b == '*'){
            if(bold){
                if(a != ''){
                    if(italics)
                        output.push({text: a, bold: true, italics:true});
                    else
                      output.push({text: a, bold: true});
                }
                bold = false;
            }
            else{
                if(italics)
                    output.push({text: a, italics: true})
                else
                    output.push({text: a})
                bold = true;
            }
            return '';
        }
        else if(b == '_'){
            if(italics){
                if(a != ''){
                    if(bold)
                        output.push({text: a, bold: true, italics:true});
                    else
                      output.push({text: a, italics: true});
                }
                italics = false;
            }
            else{
                if(bold)
                    output.push({text: a, bold: true})
                else
                    output.push({text: a})
                italics = true;
            }
            return '';
        }
        else{
            return a+b;
        }
    }, '');
    if(text != '')
        output.push({text : text});
    console.log(output);
    return output;
}


const simpleInput = "The *quick brown fox* jumps _over the lazy dog_";

getObject(simpleInput);

const italicWithinBoldInput = "The *quick brown _fox jumps_ over the* lazy dog";

getObject(italicWithinBoldInput);

const mixedInput = "The *quick brown _fox jumps* over the_ lazy dog";

getObject(mixedInput);

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