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- // Copyright 2009 the V8 project authors. All rights reserved.
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- //
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following
- // disclaimer in the documentation and/or other materials provided
- // with the distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived
- // from this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- /**
- * Creates a CSV lines parser.
- */
- export class CsvParser {
- /**
- * Converts \x00 and \u0000 escape sequences in the given string.
- *
- * @param {string} input field.
- **/
- escapeField(string) {
- let nextPos = string.indexOf("\\");
- if (nextPos === -1) return string;
- let result = [string.substring(0, nextPos)];
- // Escape sequences of the form \x00 and \u0000;
- let pos = 0;
- while (nextPos !== -1) {
- const escapeIdentifier = string[nextPos + 1];
- pos = nextPos + 2;
- if (escapeIdentifier === 'n') {
- result.push('\n');
- nextPos = pos;
- } else if (escapeIdentifier === '\\') {
- result.push('\\');
- nextPos = pos;
- } else {
- if (escapeIdentifier === 'x') {
- // \x00 ascii range escapes consume 2 chars.
- nextPos = pos + 2;
- } else {
- // \u0000 unicode range escapes consume 4 chars.
- nextPos = pos + 4;
- }
- // Convert the selected escape sequence to a single character.
- const escapeChars = string.substring(pos, nextPos);
- if (escapeChars === '2C') {
- result.push(',');
- } else {
- result.push(String.fromCharCode(parseInt(escapeChars, 16)));
- }
- }
- // Continue looking for the next escape sequence.
- pos = nextPos;
- nextPos = string.indexOf("\\", pos);
- // If there are no more escape sequences consume the rest of the string.
- if (nextPos === -1) {
- result.push(string.substr(pos));
- break;
- } else if (pos !== nextPos) {
- result.push(string.substring(pos, nextPos));
- }
- }
- return result.join('');
- }
- /**
- * Parses a line of CSV-encoded values. Returns an array of fields.
- *
- * @param {string} line Input line.
- */
- parseLine(line) {
- let pos = 0;
- const endPos = line.length;
- const fields = [];
- if (endPos == 0) return fields;
- let nextPos = 0;
- while(nextPos !== -1) {
- nextPos = line.indexOf(',', pos);
- let field;
- if (nextPos === -1) {
- field = line.substr(pos);
- } else {
- field = line.substring(pos, nextPos);
- }
- fields.push(this.escapeField(field));
- pos = nextPos + 1;
- };
- return fields
- }
- }
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