如何使用 peg.js 为更改行添加反斜杠？答案

【问题标题】：How can i make a backslash for change line with peg.js?如何使用 peg.js 为更改行添加反斜杠？
【发布时间】：2021-07-20 14:38:56
【问题描述】：

目前，我使用 '\n' 来分割每一行（段落），但现在，我想像 python 一样为更改行制作一个反斜杠。

这是我目前的规则：

Start
    = _ head:Line tail:('\n'+ l:Line { return l })* _ {
        return [head].concat(tail)
    }

Line = (!'\n' .)+ { return { lines: [ text() ] } }

_ = [ \n\r\t]*

输入：

This is Line 1

This is \ Line
\ 2

电流输出：

[
   {
      "lines": [
         "This is Line 1"
      ]
   },
   {
      "lines": [
         "This is \ Line"
      ]
   },
   {
      "lines": [
         "\ 2"
      ]
   }
]

预期输出：

[
   {
      "lines": [
         "This is Line 1"
      ]
   },
   {
      "lines": [
         "This is",
         "Line",
         "2"
      ]
   },
]

【问题讨论】：

标签： peg pegjs

【解决方案1】：

哦，我自己实现了，这是我的代码：

{
  var lines = [];
  var lineText = "";
  function resetLines() {
    lines = [];
    lineText = "";
  }
}

Start
  = _ head:Line tail:("\n"+ l:Line { return l; })* _ {
      return [head].concat(tail);
    }

Line
  = ResetLines
    chars:(
      "\n"? "\\" "\n"? {
          lines.push(lineText);
          lineText = "";
        }
      / !"\n" . { lineText += text(); }
    )+ {
      lines.push(lineText);
      return lines;
    }

ResetLines = &" "* { (lines = []), (lineText = ""); }

_ = [ \n\r\t]*

输入：

This is Line 1

This is\Line
\2

This is Line 3

输出：

[
   [
      "This is Line 1"
   ],
   [
      "This is",
      "Line",
      "2"
   ],
   [
      "This is Line 3"
   ]
]

【讨论】：