获取指定行和列的文本

Question

如果我有这样的字符串：

const string = [
  'some text here',
  'some more text here',
  'more more more text here',
  'just for some variety here'
].join('\n')

如果我有起始行号和列号，以及结束行号和列号，我怎样才能得到这些点的文本？

例如，如果行号数据是：

const lineData = {
  start: {row: 2, column: 5},
  end: {row: 3, column: 4}
}

我应该得到 'more text here\nmore'

Answer 1

这里我写了一个解决方案。我已将您的 string 数组转换为 2D 数组，并将字符从头到尾连接起来。关注这个-

const string = [
  'some text here',
  'some more text here',
  'more more more text here',
  'just for some variety here'
];

const string2d = string.map(line => line.split(''));

const lineData = {
  start: {row: 2, column: 5},
  end: {row: 3, column: 4}
}

const {start: {row: startRow, column: startColumn}, end: {row: endRow, column: endColumn}} = lineData;
let ans = '';

// Run from start row to the end row
for (let i = startRow - 1; i <= endRow - 1; i++) {
  let j = 0;
  
  // For the first row the column starts from the start column
  // And the other cases it starts from 0
  if (i === startRow - 1) {
    j = startColumn - 1;
  }
  
  // Concat the characters from j to length of the line.
  // But for the endRow line concat to the end column
  while (j < string2d[i].length) {
    ans += string2d[i][j];
    j++;
    if (i === endRow - 1 && j > endColumn) break;
  }
  
  // Append a newline after every line
  ans += "\n";
}

console.log(ans);

获取指定行和列的文本

Get the text at the specified row and column

javascript

string

line