v8/tools/csvparser.js
2009-04-17 17:58:14 +00:00

99 lines
3.1 KiB
JavaScript

// 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.
// Initlialize namespaces.
var devtools = devtools || {};
devtools.profiler = devtools.profiler || {};
/**
* Creates a CSV lines parser.
*/
devtools.profiler.CsvParser = function() {
};
/**
* A regex for matching a trailing quote.
* @private
*/
devtools.profiler.CsvParser.TRAILING_QUOTE_RE_ = /\"$/;
/**
* A regex for matching a double quote.
* @private
*/
devtools.profiler.CsvParser.DOUBLE_QUOTE_RE_ = /\"\"/g;
/**
* Parses a line of CSV-encoded values. Returns an array of fields.
*
* @param {string} line Input line.
*/
devtools.profiler.CsvParser.prototype.parseLine = function(line) {
var insideQuotes = false;
var fields = [];
var prevPos = 0;
for (var i = 0, n = line.length; i < n; ++i) {
switch (line.charAt(i)) {
case ',':
if (!insideQuotes) {
fields.push(line.substring(prevPos, i));
prevPos = i + 1;
}
break;
case '"':
if (!insideQuotes) {
insideQuotes = true;
// Skip the leading quote.
prevPos++;
} else {
if (i + 1 < n && line.charAt(i + 1) != '"') {
insideQuotes = false;
} else {
i++;
}
}
break;
}
}
if (n > 0) {
fields.push(line.substring(prevPos));
}
for (i = 0; i < fields.length; ++i) {
// Eliminate trailing quotes.
fields[i] = fields[i].replace(devtools.profiler.CsvParser.TRAILING_QUOTE_RE_, '');
// Convert quoted quotes into single ones.
fields[i] = fields[i].replace(devtools.profiler.CsvParser.DOUBLE_QUOTE_RE_, '"');
}
return fields;
};