e4a97a2e6f
Change-Id: I456b3456351860e3e5e7e9dcb800d42d543a7c47 Reviewed-on: https://chromium-review.googlesource.com/753681 Commit-Queue: Camillo Bruni <cbruni@chromium.org> Reviewed-by: Peter Marshall <petermarshall@chromium.org> Cr-Commit-Position: refs/heads/master@{#49110}
103 lines
3.6 KiB
JavaScript
103 lines
3.6 KiB
JavaScript
// Copyright 2009 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/**
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* Creates a CSV lines parser.
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*/
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class CsvParser {
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/**
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* Converts \x00 and \u0000 escape sequences in the given string.
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*
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* @param {string} input field.
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**/
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escapeField(string) {
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let nextPos = string.indexOf("\\");
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if (nextPos === -1) return string;
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let result = string.substring(0, nextPos);
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// Escape sequences of the form \x00 and \u0000;
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let endPos = string.length;
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let pos = 0;
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while (nextPos !== -1) {
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let escapeIdentifier = string.charAt(nextPos + 1);
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pos = nextPos + 2;
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if (escapeIdentifier == 'n') {
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result += '\n';
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nextPos = pos;
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} else {
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if (escapeIdentifier == 'x') {
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// \x00 ascii range escapes consume 2 chars.
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nextPos = pos + 2;
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} else {
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// \u0000 unicode range escapes consume 4 chars.
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nextPos = pos + 4;
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}
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// Convert the selected escape sequence to a single character.
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let escapeChars = string.substring(pos, nextPos);
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result += String.fromCharCode(parseInt(escapeChars, 16));
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}
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// Continue looking for the next escape sequence.
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pos = nextPos;
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nextPos = string.indexOf("\\", pos);
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// If there are no more escape sequences consume the rest of the string.
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if (nextPos === -1) {
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result += string.substr(pos);
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} else if (pos != nextPos) {
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result += string.substring(pos, nextPos);
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}
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}
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return result;
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}
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/**
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* Parses a line of CSV-encoded values. Returns an array of fields.
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*
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* @param {string} line Input line.
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*/
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parseLine(line) {
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var pos = 0;
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var endPos = line.length;
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var fields = [];
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if (endPos == 0) return fields;
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let nextPos = 0;
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while(nextPos !== -1) {
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nextPos = line.indexOf(',', pos);
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let field;
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if (nextPos === -1) {
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field = line.substr(pos);
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} else {
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field = line.substring(pos, nextPos);
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}
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fields.push(this.escapeField(field));
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pos = nextPos + 1;
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};
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return fields
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}
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}
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