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Edit File: mark.js

'use strict';

var common = require('./common');

function Mark(name, buffer, position, line, column) {
  this.name     = name;
  this.buffer   = buffer;
  this.position = position;
  this.line     = line;
  this.column   = column;
}

Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
  var head, start, tail, end, snippet;

if (!this.buffer) return null;

indent = indent || 4;
  maxLength = maxLength || 75;

head = '';
  start = this.position;

while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
    start -= 1;
    if (this.position - start > (maxLength / 2 - 1)) {
      head = ' ... ';
      start += 5;
      break;
    }
  }

tail = '';
  end = this.position;

while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
    end += 1;
    if (end - this.position > (maxLength / 2 - 1)) {
      tail = ' ... ';
      end -= 5;
      break;
    }
  }

snippet = this.buffer.slice(start, end);

return common.repeat(' ', indent) + head + snippet + tail + '\n' +
         common.repeat(' ', indent + this.position - start + head.length) + '^';
};

Mark.prototype.toString = function toString(compact) {
  var snippet, where = '';

if (this.name) {
    where += 'in "' + this.name + '" ';
  }

where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);

if (!compact) {
    snippet = this.getSnippet();

if (snippet) {
      where += ':\n' + snippet;
    }
  }

return where;
};

module.exports = Mark;

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