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221 lines
8.0 KiB
221 lines
8.0 KiB
// Copyright 2008 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Implementation of sprintf-like, python-%-operator-like,
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* .NET-String.Format-like functionality. Uses JS string's replace method to
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* extract format specifiers and sends those specifiers to a handler function,
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* which then, based on conversion type part of the specifier, calls the
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* appropriate function to handle the specific conversion.
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* For specific functionality implemented, look at formatRe below, or look
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* at the tests.
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*/
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goog.provide('goog.string.format');
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goog.require('goog.string');
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/**
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* Performs sprintf-like conversion, i.e. puts the values in a template.
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* DO NOT use it instead of built-in conversions in simple cases such as
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* 'Cost: %.2f' as it would introduce unnecessary latency opposed to
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* 'Cost: ' + cost.toFixed(2).
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* @param {string} formatString Template string containing % specifiers.
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* @param {...string|number} var_args Values formatString is to be filled with.
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* @return {string} Formatted string.
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*/
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goog.string.format = function(formatString, var_args) {
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// Convert the arguments to an array (MDC recommended way).
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var args = Array.prototype.slice.call(arguments);
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// Try to get the template.
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var template = args.shift();
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if (typeof template == 'undefined') {
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throw Error('[goog.string.format] Template required');
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}
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// This re is used for matching, it also defines what is supported.
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var formatRe = /%([0\-\ \+]*)(\d+)?(\.(\d+))?([%sfdiu])/g;
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/**
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* Chooses which conversion function to call based on type conversion
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* specifier.
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* @param {string} match Contains the re matched string.
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* @param {string} flags Formatting flags.
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* @param {string} width Replacement string minimum width.
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* @param {string} dotp Matched precision including a dot.
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* @param {string} precision Specifies floating point precision.
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* @param {string} type Type conversion specifier.
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* @param {string} offset Matching location in the original string.
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* @param {string} wholeString Has the actualString being searched.
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* @return {string} Formatted parameter.
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*/
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function replacerDemuxer(
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match, flags, width, dotp, precision, type, offset, wholeString) {
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// The % is too simple and doesn't take an argument.
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if (type == '%') {
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return '%';
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}
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// Try to get the actual value from parent function.
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var value = args.shift();
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// If we didn't get any arguments, fail.
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if (typeof value == 'undefined') {
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throw Error('[goog.string.format] Not enough arguments');
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}
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// Patch the value argument to the beginning of our type specific call.
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arguments[0] = value;
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return goog.string.format.demuxes_[type].apply(null, arguments);
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}
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return template.replace(formatRe, replacerDemuxer);
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};
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/**
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* Contains various conversion functions (to be filled in later on).
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* @private {!Object}
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*/
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goog.string.format.demuxes_ = {};
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/**
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* Processes %s conversion specifier.
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* @param {string} value Contains the formatRe matched string.
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* @param {string} flags Formatting flags.
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* @param {string} width Replacement string minimum width.
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* @param {string} dotp Matched precision including a dot.
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* @param {string} precision Specifies floating point precision.
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* @param {string} type Type conversion specifier.
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* @param {string} offset Matching location in the original string.
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* @param {string} wholeString Has the actualString being searched.
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* @return {string} Replacement string.
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*/
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goog.string.format.demuxes_['s'] = function(
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value, flags, width, dotp, precision, type, offset, wholeString) {
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var replacement = value;
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// If no padding is necessary we're done.
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// The check for '' is necessary because Firefox incorrectly provides the
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// empty string instead of undefined for non-participating capture groups,
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// and isNaN('') == false.
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if (isNaN(width) || width == '' || replacement.length >= Number(width)) {
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return replacement;
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}
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// Otherwise we should find out where to put spaces.
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if (flags.indexOf('-', 0) > -1) {
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replacement = replacement +
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goog.string.repeat(' ', Number(width) - replacement.length);
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} else {
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replacement = goog.string.repeat(' ', Number(width) - replacement.length) +
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replacement;
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}
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return replacement;
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};
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/**
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* Processes %f conversion specifier.
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* @param {string} value Contains the formatRe matched string.
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* @param {string} flags Formatting flags.
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* @param {string} width Replacement string minimum width.
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* @param {string} dotp Matched precision including a dot.
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* @param {string} precision Specifies floating point precision.
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* @param {string} type Type conversion specifier.
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* @param {string} offset Matching location in the original string.
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* @param {string} wholeString Has the actualString being searched.
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* @return {string} Replacement string.
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*/
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goog.string.format.demuxes_['f'] = function(
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value, flags, width, dotp, precision, type, offset, wholeString) {
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var replacement = value.toString();
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// The check for '' is necessary because Firefox incorrectly provides the
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// empty string instead of undefined for non-participating capture groups,
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// and isNaN('') == false.
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if (!(isNaN(precision) || precision == '')) {
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replacement = parseFloat(value).toFixed(precision);
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}
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// Generates sign string that will be attached to the replacement.
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var sign;
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if (Number(value) < 0) {
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sign = '-';
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} else if (flags.indexOf('+') >= 0) {
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sign = '+';
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} else if (flags.indexOf(' ') >= 0) {
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sign = ' ';
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} else {
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sign = '';
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}
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if (Number(value) >= 0) {
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replacement = sign + replacement;
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}
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// If no padding is necessary we're done.
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if (isNaN(width) || replacement.length >= Number(width)) {
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return replacement;
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}
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// We need a clean signless replacement to start with
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replacement = isNaN(precision) ? Math.abs(Number(value)).toString() :
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Math.abs(Number(value)).toFixed(precision);
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var padCount = Number(width) - replacement.length - sign.length;
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// Find out which side to pad, and if it's left side, then which character to
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// pad, and set the sign on the left and padding in the middle.
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if (flags.indexOf('-', 0) >= 0) {
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replacement = sign + replacement + goog.string.repeat(' ', padCount);
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} else {
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// Decides which character to pad.
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var paddingChar = (flags.indexOf('0', 0) >= 0) ? '0' : ' ';
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replacement =
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sign + goog.string.repeat(paddingChar, padCount) + replacement;
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}
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return replacement;
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};
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/**
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* Processes %d conversion specifier.
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* @param {string} value Contains the formatRe matched string.
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* @param {string} flags Formatting flags.
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* @param {string} width Replacement string minimum width.
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* @param {string} dotp Matched precision including a dot.
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* @param {string} precision Specifies floating point precision.
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* @param {string} type Type conversion specifier.
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* @param {string} offset Matching location in the original string.
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* @param {string} wholeString Has the actualString being searched.
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* @return {string} Replacement string.
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*/
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goog.string.format.demuxes_['d'] = function(
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value, flags, width, dotp, precision, type, offset, wholeString) {
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return goog.string.format.demuxes_['f'](
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parseInt(value, 10) /* value */, flags, width, dotp, 0 /* precision */,
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type, offset, wholeString);
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};
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// These are additional aliases, for integer conversion.
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goog.string.format.demuxes_['i'] = goog.string.format.demuxes_['d'];
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goog.string.format.demuxes_['u'] = goog.string.format.demuxes_['d'];
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