516 lines
20 KiB
JavaScript
516 lines
20 KiB
JavaScript
![]() |
/**
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* Accessibility module - internationalization support
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*
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* (c) 2010-2018 Highsoft AS
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* Author: Øystein Moseng
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*
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* License: www.highcharts.com/license
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*/
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'use strict';
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import H from '../parts/Globals.js';
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import '../parts/Utilities.js';
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var pick = H.pick;
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/**
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* String trim that works for IE6-8 as well.
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*
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* @private
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* @function stringTrim
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*
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* @param {string} str
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* The input string
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*
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* @return {string}
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* The trimmed string
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*/
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function stringTrim(str) {
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return str.trim && str.trim() || str.replace(/^\s+|\s+$/g, '');
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}
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/**
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* i18n utility function. Format a single array or plural statement in a format
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* string. If the statement is not an array or plural statement, returns the
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* statement within brackets. Invalid array statements return an empty string.
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*
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* @private
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* @function formatExtendedStatement
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*
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* @param {string} statement
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*
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* @param {Highcharts.Dictionary<*>} ctx
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* Context to apply to the format string.
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*
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* @return {string}
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*/
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function formatExtendedStatement(statement, ctx) {
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var eachStart = statement.indexOf('#each('),
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pluralStart = statement.indexOf('#plural('),
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indexStart = statement.indexOf('['),
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indexEnd = statement.indexOf(']'),
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arr,
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result;
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// Dealing with an each-function?
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if (eachStart > -1) {
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var eachEnd = statement.slice(eachStart).indexOf(')') + eachStart,
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preEach = statement.substring(0, eachStart),
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postEach = statement.substring(eachEnd + 1),
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eachStatement = statement.substring(eachStart + 6, eachEnd),
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eachArguments = eachStatement.split(','),
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lenArg = Number(eachArguments[1]),
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len;
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result = '';
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arr = ctx[eachArguments[0]];
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if (arr) {
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lenArg = isNaN(lenArg) ? arr.length : lenArg;
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len = lenArg < 0 ?
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arr.length + lenArg :
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Math.min(lenArg, arr.length); // Overshoot
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// Run through the array for the specified length
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for (var i = 0; i < len; ++i) {
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result += preEach + arr[i] + postEach;
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}
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}
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return result.length ? result : '';
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}
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// Dealing with a plural-function?
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if (pluralStart > -1) {
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var pluralEnd = statement.slice(pluralStart).indexOf(')') + pluralStart,
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pluralStatement = statement.substring(pluralStart + 8, pluralEnd),
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pluralArguments = pluralStatement.split(','),
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num = Number(ctx[pluralArguments[0]]);
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switch (num) {
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case 0:
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result = pick(pluralArguments[4], pluralArguments[1]);
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break;
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case 1:
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result = pick(pluralArguments[2], pluralArguments[1]);
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break;
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case 2:
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result = pick(pluralArguments[3], pluralArguments[1]);
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break;
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default:
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result = pluralArguments[1];
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}
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return result ? stringTrim(result) : '';
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}
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// Array index
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if (indexStart > -1) {
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var arrayName = statement.substring(0, indexStart),
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ix = Number(statement.substring(indexStart + 1, indexEnd)),
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val;
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arr = ctx[arrayName];
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if (!isNaN(ix) && arr) {
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if (ix < 0) {
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val = arr[arr.length + ix];
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// Handle negative overshoot
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if (val === undefined) {
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val = arr[0];
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}
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} else {
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val = arr[ix];
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// Handle positive overshoot
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if (val === undefined) {
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val = arr[arr.length - 1];
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}
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}
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}
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return val !== undefined ? val : '';
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}
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// Standard substitution, delegate to H.format or similar
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return '{' + statement + '}';
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}
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/**
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* i18n formatting function. Extends Highcharts.format() functionality by also
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* handling arrays and plural conditionals. Arrays can be indexed as follows:
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*
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* - Format: 'This is the first index: {myArray[0]}. The last: {myArray[-1]}.'
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*
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* - Context: { myArray: [0, 1, 2, 3, 4, 5] }
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*
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* - Result: 'This is the first index: 0. The last: 5.'
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*
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*
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* They can also be iterated using the #each() function. This will repeat the
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* contents of the bracket expression for each element. Example:
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*
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* - Format: 'List contains: {#each(myArray)cm }'
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*
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* - Context: { myArray: [0, 1, 2] }
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*
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* - Result: 'List contains: 0cm 1cm 2cm '
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*
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*
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* The #each() function optionally takes a length parameter. If positive, this
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* parameter specifies the max number of elements to iterate through. If
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* negative, the function will subtract the number from the length of the array.
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* Use this to stop iterating before the array ends. Example:
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*
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* - Format: 'List contains: {#each(myArray, -1) }and {myArray[-1]}.'
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*
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* - Context: { myArray: [0, 1, 2, 3] }
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*
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* - Result: 'List contains: 0, 1, 2, and 3.'
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*
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*
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* Use the #plural() function to pick a string depending on whether or not a
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* context object is 1. Arguments are #plural(obj, plural, singular). Example:
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*
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* - Format: 'Has {numPoints} {#plural(numPoints, points, point}.'
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*
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* - Context: { numPoints: 5 }
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*
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* - Result: 'Has 5 points.'
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*
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*
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* Optionally there are additional parameters for dual and none: #plural(obj,
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* plural, singular, dual, none). Example:
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*
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* - Format: 'Has {#plural(numPoints, many points, one point, two points,
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* none}.'
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*
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* - Context: { numPoints: 2 }
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*
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* - Result: 'Has two points.'
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*
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*
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* The dual or none parameters will take precedence if they are supplied.
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*
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*
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* @function Highcharts.i18nFormat
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* @requires a11y-i18n
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*
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* @param {string} formatString
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* The string to format.
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*
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* @param {Highcharts.Dictionary<*>} context
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* Context to apply to the format string.
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*
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* @param {Highcharts.Time} time
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* A `Time` instance for date formatting, passed on to H.format().
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*
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* @return {string}
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* The formatted string.
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*/
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H.i18nFormat = function (formatString, context, time) {
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var getFirstBracketStatement = function (sourceStr, offset) {
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var str = sourceStr.slice(offset || 0),
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startBracket = str.indexOf('{'),
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endBracket = str.indexOf('}');
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if (startBracket > -1 && endBracket > startBracket) {
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return {
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statement: str.substring(startBracket + 1, endBracket),
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begin: offset + startBracket + 1,
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end: offset + endBracket
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};
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}
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},
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tokens = [],
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bracketRes,
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constRes,
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cursor = 0;
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// Tokenize format string into bracket statements and constants
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do {
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bracketRes = getFirstBracketStatement(formatString, cursor);
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constRes = formatString.substring(
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cursor,
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bracketRes && bracketRes.begin - 1
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);
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// If we have constant content before this bracket statement, add it
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if (constRes.length) {
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tokens.push({
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value: constRes,
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type: 'constant'
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});
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}
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// Add the bracket statement
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if (bracketRes) {
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tokens.push({
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value: bracketRes.statement,
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type: 'statement'
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});
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}
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cursor = bracketRes && bracketRes.end + 1;
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} while (bracketRes);
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// Perform the formatting. The formatArrayStatement function returns the
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// statement in brackets if it is not an array statement, which means it
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// gets picked up by H.format below.
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tokens.forEach(function (token) {
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if (token.type === 'statement') {
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token.value = formatExtendedStatement(token.value, context);
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}
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});
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// Join string back together and pass to H.format to pick up non-array
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// statements.
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return H.format(tokens.reduce(function (acc, cur) {
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return acc + cur.value;
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}, ''), context, time);
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};
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/**
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* Apply context to a format string from lang options of the chart.
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*
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* @function Highcharts.Chart#langFormat
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* @requires a11y-i18n
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*
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* @param {string} langKey
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* Key (using dot notation) into lang option structure.
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*
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* @param {Highcharts.Dictionary<*>} context
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* Context to apply to the format string.
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*
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* @return {string}
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* The formatted string.
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*/
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H.Chart.prototype.langFormat = function (langKey, context, time) {
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var keys = langKey.split('.'),
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formatString = this.options.lang,
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i = 0;
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for (; i < keys.length; ++i) {
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formatString = formatString && formatString[keys[i]];
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}
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return typeof formatString === 'string' && H.i18nFormat(
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formatString, context, time
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);
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};
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H.setOptions({ lang: {
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/**
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* Configure the accessibility strings in the chart. Requires the
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* [accessibility module](//code.highcharts.com/modules/accessibility.js)
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* to be loaded. For a description of the module and information on its
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* features, see [Highcharts Accessibility](
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* http://www.highcharts.com/docs/chart-concepts/accessibility).
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*
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* For more dynamic control over the accessibility functionality, see
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* [accessibility.pointDescriptionFormatter](
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* accessibility.pointDescriptionFormatter),
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* [accessibility.seriesDescriptionFormatter](
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* accessibility.seriesDescriptionFormatter), and
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* [accessibility.screenReaderSectionFormatter](
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* accessibility.screenReaderSectionFormatter).
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*
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* @since 6.0.6
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* @optionparent lang.accessibility
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*/
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accessibility: {
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/* eslint-disable max-len */
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screenReaderRegionLabel: 'Chart screen reader information.',
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navigationHint: 'Use regions/landmarks to skip ahead to chart {#plural(numSeries, and navigate between data series,)}',
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defaultChartTitle: 'Chart',
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longDescriptionHeading: 'Long description.',
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noDescription: 'No description available.',
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structureHeading: 'Structure.',
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viewAsDataTable: 'View as data table.',
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chartHeading: 'Chart graphic.',
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chartContainerLabel: 'Interactive chart. {title}. Use up and down arrows to navigate with most screen readers.',
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rangeSelectorMinInput: 'Select start date.',
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rangeSelectorMaxInput: 'Select end date.',
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tableSummary: 'Table representation of chart.',
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mapZoomIn: 'Zoom chart',
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mapZoomOut: 'Zoom out chart',
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rangeSelectorButton: 'Select range {buttonText}',
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legendItem: 'Toggle visibility of series {itemName}',
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/* eslint-enable max-len */
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/**
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* Title element text for the chart SVG element. Leave this
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* empty to disable adding the title element. Browsers will display
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* this content when hovering over elements in the chart. Assistive
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* technology may use this element to label the chart.
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*
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* @since 6.0.8
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*/
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svgContainerTitle: '{chartTitle}',
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/**
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* Descriptions of lesser known series types. The relevant
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* description is added to the screen reader information region
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* when these series types are used.
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*
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* @since 6.0.6
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*/
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seriesTypeDescriptions: {
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boxplot: 'Box plot charts are typically used to display ' +
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'groups of statistical data. Each data point in the ' +
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'chart can have up to 5 values: minimum, lower quartile, ' +
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'median, upper quartile, and maximum.',
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arearange: 'Arearange charts are line charts displaying a ' +
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'range between a lower and higher value for each point.',
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areasplinerange: 'These charts are line charts displaying a ' +
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'range between a lower and higher value for each point.',
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bubble: 'Bubble charts are scatter charts where each data ' +
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'point also has a size value.',
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columnrange: 'Columnrange charts are column charts ' +
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'displaying a range between a lower and higher value for ' +
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'each point.',
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errorbar: 'Errorbar series are used to display the ' +
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'variability of the data.',
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funnel: 'Funnel charts are used to display reduction of data ' +
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'in stages.',
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pyramid: 'Pyramid charts consist of a single pyramid with ' +
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'item heights corresponding to each point value.',
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waterfall: 'A waterfall chart is a column chart where each ' +
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'column contributes towards a total end value.'
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},
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/**
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* Chart type description strings. This is added to the chart
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* information region.
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*
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* If there is only a single series type used in the chart, we use
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* the format string for the series type, or default if missing.
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* There is one format string for cases where there is only a single
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* series in the chart, and one for multiple series of the same
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* type.
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*
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* @since 6.0.6
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*/
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chartTypes: {
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/* eslint-disable max-len */
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emptyChart: 'Empty chart',
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mapTypeDescription: 'Map of {mapTitle} with {numSeries} data series.',
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unknownMap: 'Map of unspecified region with {numSeries} data series.',
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combinationChart: 'Combination chart with {numSeries} data series.',
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defaultSingle: 'Chart with {numPoints} data {#plural(numPoints, points, point)}.',
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defaultMultiple: 'Chart with {numSeries} data series.',
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splineSingle: 'Line chart with {numPoints} data {#plural(numPoints, points, point)}.',
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splineMultiple: 'Line chart with {numSeries} lines.',
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lineSingle: 'Line chart with {numPoints} data {#plural(numPoints, points, point)}.',
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lineMultiple: 'Line chart with {numSeries} lines.',
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columnSingle: 'Bar chart with {numPoints} {#plural(numPoints, bars, bar)}.',
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columnMultiple: 'Bar chart with {numSeries} data series.',
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barSingle: 'Bar chart with {numPoints} {#plural(numPoints, bars, bar)}.',
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barMultiple: 'Bar chart with {numSeries} data series.',
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pieSingle: 'Pie chart with {numPoints} {#plural(numPoints, slices, slice)}.',
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pieMultiple: 'Pie chart with {numSeries} pies.',
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scatterSingle: 'Scatter chart with {numPoints} {#plural(numPoints, points, point)}.',
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scatterMultiple: 'Scatter chart with {numSeries} data series.',
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boxplotSingle: 'Boxplot with {numPoints} {#plural(numPoints, boxes, box)}.',
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boxplotMultiple: 'Boxplot with {numSeries} data series.',
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bubbleSingle: 'Bubble chart with {numPoints} {#plural(numPoints, bubbles, bubble)}.',
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bubbleMultiple: 'Bubble chart with {numSeries} data series.'
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}, /* eslint-enable max-len */
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/**
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* Axis description format strings.
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*
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* @since 6.0.6
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*/
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axis: {
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/* eslint-disable max-len */
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xAxisDescriptionSingular: 'The chart has 1 X axis displaying {names[0]}.',
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xAxisDescriptionPlural: 'The chart has {numAxes} X axes displaying {#names.forEach(-1) }and {names[-1]}',
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yAxisDescriptionSingular: 'The chart has 1 Y axis displaying {names[0]}.',
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yAxisDescriptionPlural: 'The chart has {numAxes} Y axes displaying {#names.forEach(-1) }and {names[-1]}'
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}, /* eslint-enable max-len */
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/**
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* Exporting menu format strings for accessibility module.
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*
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* @since 6.0.6
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*/
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exporting: {
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chartMenuLabel: 'Chart export',
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menuButtonLabel: 'View export menu',
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exportRegionLabel: 'Chart export menu'
|
||
|
},
|
||
|
|
||
|
/**
|
||
|
* Lang configuration for different series types. For more dynamic
|
||
|
* control over the series element descriptions, see
|
||
|
* [accessibility.seriesDescriptionFormatter](
|
||
|
* accessibility.seriesDescriptionFormatter).
|
||
|
*
|
||
|
* @since 6.0.6
|
||
|
*/
|
||
|
series: {
|
||
|
/**
|
||
|
* Lang configuration for the series main summary. Each series
|
||
|
* type has two modes:
|
||
|
*
|
||
|
* 1. This series type is the only series type used in the
|
||
|
* chart
|
||
|
*
|
||
|
* 2. This is a combination chart with multiple series types
|
||
|
*
|
||
|
* If a definition does not exist for the specific series type
|
||
|
* and mode, the 'default' lang definitions are used.
|
||
|
*
|
||
|
* @since 6.0.6
|
||
|
*/
|
||
|
summary: {
|
||
|
/* eslint-disable max-len */
|
||
|
default: '{name}, series {ix} of {numSeries} with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
defaultCombination: '{name}, series {ix} of {numSeries} with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
line: '{name}, line {ix} of {numSeries} with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
lineCombination: '{name}, series {ix} of {numSeries}. Line with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
spline: '{name}, line {ix} of {numSeries} with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
splineCombination: '{name}, series {ix} of {numSeries}. Line with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
column: '{name}, bar series {ix} of {numSeries} with {numPoints} {#plural(numPoints, bars, bar)}.',
|
||
|
columnCombination: '{name}, series {ix} of {numSeries}. Bar series with {numPoints} {#plural(numPoints, bars, bar)}.',
|
||
|
bar: '{name}, bar series {ix} of {numSeries} with {numPoints} {#plural(numPoints, bars, bar)}.',
|
||
|
barCombination: '{name}, series {ix} of {numSeries}. Bar series with {numPoints} {#plural(numPoints, bars, bar)}.',
|
||
|
pie: '{name}, pie {ix} of {numSeries} with {numPoints} {#plural(numPoints, slices, slice)}.',
|
||
|
pieCombination: '{name}, series {ix} of {numSeries}. Pie with {numPoints} {#plural(numPoints, slices, slice)}.',
|
||
|
scatter: '{name}, scatter plot {ix} of {numSeries} with {numPoints} {#plural(numPoints, points, point)}.',
|
||
|
scatterCombination: '{name}, series {ix} of {numSeries}, scatter plot with {numPoints} {#plural(numPoints, points, point)}.',
|
||
|
boxplot: '{name}, boxplot {ix} of {numSeries} with {numPoints} {#plural(numPoints, boxes, box)}.',
|
||
|
boxplotCombination: '{name}, series {ix} of {numSeries}. Boxplot with {numPoints} {#plural(numPoints, boxes, box)}.',
|
||
|
bubble: '{name}, bubble series {ix} of {numSeries} with {numPoints} {#plural(numPoints, bubbles, bubble)}.',
|
||
|
bubbleCombination: '{name}, series {ix} of {numSeries}. Bubble series with {numPoints} {#plural(numPoints, bubbles, bubble)}.',
|
||
|
map: '{name}, map {ix} of {numSeries} with {numPoints} {#plural(numPoints, areas, area)}.',
|
||
|
mapCombination: '{name}, series {ix} of {numSeries}. Map with {numPoints} {#plural(numPoints, areas, area)}.',
|
||
|
mapline: '{name}, line {ix} of {numSeries} with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
maplineCombination: '{name}, series {ix} of {numSeries}. Line with {numPoints} data {#plural(numPoints, points, point)}.',
|
||
|
mapbubble: '{name}, bubble series {ix} of {numSeries} with {numPoints} {#plural(numPoints, bubbles, bubble)}.',
|
||
|
mapbubbleCombination: '{name}, series {ix} of {numSeries}. Bubble series with {numPoints} {#plural(numPoints, bubbles, bubble)}.'
|
||
|
}, /* eslint-enable max-len */
|
||
|
|
||
|
/**
|
||
|
* User supplied description text. This is added after the main
|
||
|
* summary if present.
|
||
|
*
|
||
|
* @since 6.0.6
|
||
|
*/
|
||
|
description: '{description}',
|
||
|
|
||
|
/**
|
||
|
* xAxis description for series if there are multiple xAxes in
|
||
|
* the chart.
|
||
|
*
|
||
|
* @since 6.0.6
|
||
|
*/
|
||
|
xAxisDescription: 'X axis, {name}',
|
||
|
|
||
|
/**
|
||
|
* yAxis description for series if there are multiple yAxes in
|
||
|
* the chart.
|
||
|
*
|
||
|
* @since 6.0.6
|
||
|
*/
|
||
|
yAxisDescription: 'Y axis, {name}'
|
||
|
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
} });
|