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/* *
* Accessibility module - internationalization support
*
* (c) 2010-2019 Highsoft AS
* Author: Øystein Moseng
*
* License: www.highcharts.com/license
*/
'use strict';
import H from '../../parts/Globals.js';
import '../../parts/Utilities.js';
var pick = H.pick;
/**
* String trim that works for IE6-8 as well.
*
* @private
* @function stringTrim
*
* @param {string} str
* The input string
*
* @return {string}
* The trimmed string
*/
function stringTrim(str) {
return str.trim && str.trim() || str.replace(/^\s+|\s+$/g, '');
}
/**
* i18n utility function. Format a single array or plural statement in a format
* string. If the statement is not an array or plural statement, returns the
* statement within brackets. Invalid array statements return an empty string.
*
* @private
* @function formatExtendedStatement
*
* @param {string} statement
*
* @param {Highcharts.Dictionary<*>} ctx
* Context to apply to the format string.
*
* @return {string}
*/
function formatExtendedStatement(statement, ctx) {
var eachStart = statement.indexOf('#each('),
pluralStart = statement.indexOf('#plural('),
indexStart = statement.indexOf('['),
indexEnd = statement.indexOf(']'),
arr,
result;
// Dealing with an each-function?
if (eachStart > -1) {
var eachEnd = statement.slice(eachStart).indexOf(')') + eachStart,
preEach = statement.substring(0, eachStart),
postEach = statement.substring(eachEnd + 1),
eachStatement = statement.substring(eachStart + 6, eachEnd),
eachArguments = eachStatement.split(','),
lenArg = Number(eachArguments[1]),
len;
result = '';
arr = ctx[eachArguments[0]];
if (arr) {
lenArg = isNaN(lenArg) ? arr.length : lenArg;
len = lenArg < 0 ?
arr.length + lenArg :
Math.min(lenArg, arr.length); // Overshoot
// Run through the array for the specified length
for (var i = 0; i < len; ++i) {
result += preEach + arr[i] + postEach;
}
}
return result.length ? result : '';
}
// Dealing with a plural-function?
if (pluralStart > -1) {
var pluralEnd = statement.slice(pluralStart).indexOf(')') + pluralStart,
pluralStatement = statement.substring(pluralStart + 8, pluralEnd),
pluralArguments = pluralStatement.split(','),
num = Number(ctx[pluralArguments[0]]);
switch (num) {
case 0:
result = pick(pluralArguments[4], pluralArguments[1]);
break;
case 1:
result = pick(pluralArguments[2], pluralArguments[1]);
break;
case 2:
result = pick(pluralArguments[3], pluralArguments[1]);
break;
default:
result = pluralArguments[1];
}
return result ? stringTrim(result) : '';
}
// Array index
if (indexStart > -1) {
var arrayName = statement.substring(0, indexStart),
ix = Number(statement.substring(indexStart + 1, indexEnd)),
val;
arr = ctx[arrayName];
if (!isNaN(ix) && arr) {
if (ix < 0) {
val = arr[arr.length + ix];
// Handle negative overshoot
if (val === undefined) {
val = arr[0];
}
} else {
val = arr[ix];
// Handle positive overshoot
if (val === undefined) {
val = arr[arr.length - 1];
}
}
}
return val !== undefined ? val : '';
}
// Standard substitution, delegate to H.format or similar
return '{' + statement + '}';
}
/**
* i18n formatting function. Extends Highcharts.format() functionality by also
* handling arrays and plural conditionals. Arrays can be indexed as follows:
*
* - Format: 'This is the first index: {myArray[0]}. The last: {myArray[-1]}.'
*
* - Context: { myArray: [0, 1, 2, 3, 4, 5] }
*
* - Result: 'This is the first index: 0. The last: 5.'
*
*
* They can also be iterated using the #each() function. This will repeat the
* contents of the bracket expression for each element. Example:
*
* - Format: 'List contains: {#each(myArray)cm }'
*
* - Context: { myArray: [0, 1, 2] }
*
* - Result: 'List contains: 0cm 1cm 2cm '
*
*
* The #each() function optionally takes a length parameter. If positive, this
* parameter specifies the max number of elements to iterate through. If
* negative, the function will subtract the number from the length of the array.
* Use this to stop iterating before the array ends. Example:
*
* - Format: 'List contains: {#each(myArray, -1) }and {myArray[-1]}.'
*
* - Context: { myArray: [0, 1, 2, 3] }
*
* - Result: 'List contains: 0, 1, 2, and 3.'
*
*
* Use the #plural() function to pick a string depending on whether or not a
* context object is 1. Arguments are #plural(obj, plural, singular). Example:
*
* - Format: 'Has {numPoints} {#plural(numPoints, points, point}.'
*
* - Context: { numPoints: 5 }
*
* - Result: 'Has 5 points.'
*
*
* Optionally there are additional parameters for dual and none: #plural(obj,
* plural, singular, dual, none). Example:
*
* - Format: 'Has {#plural(numPoints, many points, one point, two points,
* none}.'
*
* - Context: { numPoints: 2 }
*
* - Result: 'Has two points.'
*
*
* The dual or none parameters will take precedence if they are supplied.
*
*
* @function Highcharts.i18nFormat
* @requires a11y-i18n
*
* @param {string} formatString
* The string to format.
*
* @param {Highcharts.Dictionary<*>} context
* Context to apply to the format string.
*
* @param {Highcharts.Time} time
* A `Time` instance for date formatting, passed on to H.format().
*
* @return {string}
* The formatted string.
*/
H.i18nFormat = function (formatString, context, time) {
var getFirstBracketStatement = function (sourceStr, offset) {
var str = sourceStr.slice(offset || 0),
startBracket = str.indexOf('{'),
endBracket = str.indexOf('}');
if (startBracket > -1 && endBracket > startBracket) {
return {
statement: str.substring(startBracket + 1, endBracket),
begin: offset + startBracket + 1,
end: offset + endBracket
};
}
},
tokens = [],
bracketRes,
constRes,
cursor = 0;
// Tokenize format string into bracket statements and constants
do {
bracketRes = getFirstBracketStatement(formatString, cursor);
constRes = formatString.substring(
cursor,
bracketRes && bracketRes.begin - 1
);
// If we have constant content before this bracket statement, add it
if (constRes.length) {
tokens.push({
value: constRes,
type: 'constant'
});
}
// Add the bracket statement
if (bracketRes) {
tokens.push({
value: bracketRes.statement,
type: 'statement'
});
}
cursor = bracketRes && bracketRes.end + 1;
} while (bracketRes);
// Perform the formatting. The formatArrayStatement function returns the
// statement in brackets if it is not an array statement, which means it
// gets picked up by H.format below.
tokens.forEach(function (token) {
if (token.type === 'statement') {
token.value = formatExtendedStatement(token.value, context);
}
});
// Join string back together and pass to H.format to pick up non-array
// statements.
return H.format(tokens.reduce(function (acc, cur) {
return acc + cur.value;
}, ''), context, time);
};
/**
* Apply context to a format string from lang options of the chart.
*
* @function Highcharts.Chart#langFormat
* @requires a11y-i18n
*
* @param {string} langKey
* Key (using dot notation) into lang option structure.
*
* @param {Highcharts.Dictionary<*>} context
* Context to apply to the format string.
*
* @return {string}
* The formatted string.
*/
H.Chart.prototype.langFormat = function (langKey, context, time) {
var keys = langKey.split('.'),
formatString = this.options.lang,
i = 0;
for (; i < keys.length; ++i) {
formatString = formatString && formatString[keys[i]];
}
return typeof formatString === 'string' && H.i18nFormat(
formatString, context, time
);
};
H.setOptions({
lang: {
/**
* Configure the accessibility strings in the chart. Requires the
* [accessibility module](https://code.highcharts.com/modules/accessibility.js)
* to be loaded. For a description of the module and information on its
* features, see
* [Highcharts Accessibility](https://www.highcharts.com/docs/chart-concepts/accessibility).
*
* For more dynamic control over the accessibility functionality, see
* [accessibility.pointDescriptionFormatter](#accessibility.pointDescriptionFormatter),
* [accessibility.seriesDescriptionFormatter](#accessibility.seriesDescriptionFormatter),
* and
* [accessibility.screenReaderSectionFormatter](#accessibility.screenReaderSectionFormatter).
*
* @since 6.0.6
* @optionparent lang.accessibility
*/
accessibility: {
/* eslint-disable max-len */
screenReaderRegionLabel: 'Chart screen reader information.',
defaultChartTitle: 'Chart',
viewAsDataTable: 'View as data table.',
chartHeading: 'Chart graphic.',
chartContainerLabel: '{title}. Interactive chart.',
svgContainerLabel: 'Interactive chart',
rangeSelectorMinInput: 'Select start date.',
rangeSelectorMaxInput: 'Select end date.',
tableSummary: 'Table representation of chart.',
mapZoomIn: 'Zoom chart',
mapZoomOut: 'Zoom out chart',
resetZoomButton: 'Reset zoom',
drillUpButton: '{buttonText}',
rangeSelectorButton: 'Select range {buttonText}',
legendLabel: 'Toggle series visibility',
legendItem: 'Toggle visibility of {itemName}',
/* eslint-enable max-len */
/**
* Thousands separator to use when formatting numbers for screen
* readers. Note that many screen readers will not handle space as a
* thousands separator, and will consider "11 700" as two numbers.
*
* Set to `null` to use the separator defined in
* [lang.thousandsSep](lang.thousandsSep).
*
* @since 7.1.0
*/
thousandsSep: ',',
/**
* Title element text for the chart SVG element. Leave this
* empty to disable adding the title element. Browsers will display
* this content when hovering over elements in the chart. Assistive
* technology may use this element to label the chart.
*
* @since 6.0.8
*/
svgContainerTitle: '',
/**
* Label for the end of the chart. Announced by screen readers.
*
* @since .1.0
*/
svgContainerEnd: 'End of interactive chart',
/**
* Default announcement for new data in charts. If addPoint or
* addSeries is used, and only one series/point is added, the
* `newPointAnnounce` and `newSeriesAnnounce` strings are used.
* The `...Single` versions will be used if there is only one chart
* on the page, and the `...Multiple` versions will be used if there
* are multiple charts on the page. For all other new data events,
* the `newDataAnnounce` string will be used.
*
* @since 7.1.0
*/
announceNewData: {
newDataAnnounce: 'Updated data for chart {chartTitle}',
newSeriesAnnounceSingle: 'New data series: {seriesDesc}',
newPointAnnounceSingle: 'New data point: {pointDesc}',
newSeriesAnnounceMultiple:
'New data series in chart {chartTitle}: {seriesDesc}',
newPointAnnounceMultiple:
'New data point in chart {chartTitle}: {pointDesc}'
},
/**
* Descriptions of lesser known series types. The relevant
* description is added to the screen reader information region
* when these series types are used.
*
* @since 6.0.6
*/
seriesTypeDescriptions: {
boxplot: 'Box plot charts are typically used to display ' +
'groups of statistical data. Each data point in the ' +
'chart can have up to 5 values: minimum, lower quartile, ' +
'median, upper quartile, and maximum.',
arearange: 'Arearange charts are line charts displaying a ' +
'range between a lower and higher value for each point.',
areasplinerange: 'These charts are line charts displaying a ' +
'range between a lower and higher value for each point.',
bubble: 'Bubble charts are scatter charts where each data ' +
'point also has a size value.',
columnrange: 'Columnrange charts are column charts ' +
'displaying a range between a lower and higher value for ' +
'each point.',
errorbar: 'Errorbar series are used to display the ' +
'variability of the data.',
funnel: 'Funnel charts are used to display reduction of data ' +
'in stages.',
pyramid: 'Pyramid charts consist of a single pyramid with ' +
'item heights corresponding to each point value.',
waterfall: 'A waterfall chart is a column chart where each ' +
'column contributes towards a total end value.'
},
/**
* Chart type description strings. This is added to the chart
* information region.
*
* If there is only a single series type used in the chart, we use
* the format string for the series type, or default if missing.
* There is one format string for cases where there is only a single
* series in the chart, and one for multiple series of the same
* type.
*
* @since 6.0.6
*/
chartTypes: {
/* eslint-disable max-len */
emptyChart: 'Empty chart',
mapTypeDescription: 'Map of {mapTitle} with {numSeries} data series.',
unknownMap: 'Map of unspecified region with {numSeries} data series.',
combinationChart: 'Combination chart with {numSeries} data series.',
defaultSingle: 'Chart with {numPoints} data {#plural(numPoints, points, point)}.',
defaultMultiple: 'Chart with {numSeries} data series.',
splineSingle: 'Line chart with {numPoints} data {#plural(numPoints, points, point)}.',
splineMultiple: 'Line chart with {numSeries} lines.',
lineSingle: 'Line chart with {numPoints} data {#plural(numPoints, points, point)}.',
lineMultiple: 'Line chart with {numSeries} lines.',
columnSingle: 'Bar chart with {numPoints} {#plural(numPoints, bars, bar)}.',
columnMultiple: 'Bar chart with {numSeries} data series.',
barSingle: 'Bar chart with {numPoints} {#plural(numPoints, bars, bar)}.',
barMultiple: 'Bar chart with {numSeries} data series.',
pieSingle: 'Pie chart with {numPoints} {#plural(numPoints, slices, slice)}.',
pieMultiple: 'Pie chart with {numSeries} pies.',
scatterSingle: 'Scatter chart with {numPoints} {#plural(numPoints, points, point)}.',
scatterMultiple: 'Scatter chart with {numSeries} data series.',
boxplotSingle: 'Boxplot with {numPoints} {#plural(numPoints, boxes, box)}.',
boxplotMultiple: 'Boxplot with {numSeries} data series.',
bubbleSingle: 'Bubble chart with {numPoints} {#plural(numPoints, bubbles, bubble)}.',
bubbleMultiple: 'Bubble chart with {numSeries} data series.'
}, /* eslint-enable max-len */
/**
* Axis description format strings.
*
* @since 6.0.6
*/
axis: {
/* eslint-disable max-len */
xAxisDescriptionSingular: 'The chart has 1 X axis displaying {names[0]}. {ranges[0]}',
xAxisDescriptionPlural: 'The chart has {numAxes} X axes displaying {#each(names, -1) }and {names[-1]}.',
yAxisDescriptionSingular: 'The chart has 1 Y axis displaying {names[0]}. {ranges[0]}',
yAxisDescriptionPlural: 'The chart has {numAxes} Y axes displaying {#each(names, -1) }and {names[-1]}.',
timeRangeDays: 'Range: {range} days.',
timeRangeHours: 'Range: {range} hours.',
timeRangeMinutes: 'Range: {range} minutes.',
timeRangeSeconds: 'Range: {range} seconds.',
rangeFromTo: 'Range: {rangeFrom} to {rangeTo}.',
rangeCategories: 'Range: {numCategories} categories.'
}, /* eslint-enable max-len */
/**
* Exporting menu format strings for accessibility module.
*
* @since 6.0.6
*/
exporting: {
chartMenuLabel: 'Chart export',
menuButtonLabel: 'View export menu',
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}'
}
}
}
});