* Converts \x00 and \u0000 escape sequences in the given string. * * @param {string} input field.
(string)
| 36 | * @param {string} input field. |
| 37 | **/ |
| 38 | escapeField(string) { |
| 39 | let nextPos = string.indexOf("\\"); |
| 40 | if (nextPos === -1) return string; |
| 41 | let result = [string.substring(0, nextPos)]; |
| 42 | // Escape sequences of the form \x00 and \u0000; |
| 43 | let pos = 0; |
| 44 | while (nextPos !== -1) { |
| 45 | const escapeIdentifier = string[nextPos + 1]; |
| 46 | pos = nextPos + 2; |
| 47 | if (escapeIdentifier === 'n') { |
| 48 | result.push('\n'); |
| 49 | nextPos = pos; |
| 50 | } else if (escapeIdentifier === '\\') { |
| 51 | result.push('\\'); |
| 52 | nextPos = pos; |
| 53 | } else { |
| 54 | if (escapeIdentifier === 'x') { |
| 55 | // \x00 ascii range escapes consume 2 chars. |
| 56 | nextPos = pos + 2; |
| 57 | } else { |
| 58 | // \u0000 unicode range escapes consume 4 chars. |
| 59 | nextPos = pos + 4; |
| 60 | } |
| 61 | // Convert the selected escape sequence to a single character. |
| 62 | const escapeChars = string.substring(pos, nextPos); |
| 63 | if (escapeChars === '2C') { |
| 64 | result.push(','); |
| 65 | } else { |
| 66 | result.push(String.fromCharCode(parseInt(escapeChars, 16))); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | // Continue looking for the next escape sequence. |
| 71 | pos = nextPos; |
| 72 | nextPos = string.indexOf("\\", pos); |
| 73 | // If there are no more escape sequences consume the rest of the string. |
| 74 | if (nextPos === -1) { |
| 75 | result.push(string.substr(pos)); |
| 76 | break; |
| 77 | } else if (pos !== nextPos) { |
| 78 | result.push(string.substring(pos, nextPos)); |
| 79 | } |
| 80 | } |
| 81 | return result.join(''); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Parses a line of CSV-encoded values. Returns an array of fields. |