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'use strict';
var defaults = require('../core/core.defaults');
var helpers = require('./helpers.core');
var valueOrDefault = helpers.valueOrDefault;
/**
* Converts the given font object into a CSS font string.
* @param {object} font - A font object.
* @return {string} The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
* @private
*/
function toFontString(font) {
if (!font || helpers.isNullOrUndef(font.size) || helpers.isNullOrUndef(font.family)) {
return null;
}
return (font.style ? font.style + ' ' : '')
+ (font.weight ? font.weight + ' ' : '')
+ font.size + 'px '
+ font.family;
}
/**
* @alias Chart.helpers.options
* @namespace
*/
module.exports = {
/**
* Converts the given line height `value` in pixels for a specific font `size`.
* @param {number|string} value - The lineHeight to parse (eg. 1.6, '14px', '75%', '1.6em').
* @param {number} size - The font size (in pixels) used to resolve relative `value`.
* @returns {number} The effective line height in pixels (size * 1.2 if value is invalid).
* @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
* @since 2.7.0
*/
toLineHeight: function(value, size) {
var matches = ('' + value).match(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
if (!matches || matches[1] === 'normal') {
return size * 1.2;
}
value = +matches[2];
switch (matches[3]) {
case 'px':
return value;
case '%':
value /= 100;
break;
default:
break;
}
return size * value;
},
/**
* Converts the given value into a padding object with pre-computed width/height.
* @param {number|object} value - If a number, set the value to all TRBL component,
* else, if and object, use defined properties and sets undefined ones to 0.
* @returns {object} The padding values (top, right, bottom, left, width, height)
* @since 2.7.0
*/
toPadding: function(value) {
var t, r, b, l;
if (helpers.isObject(value)) {
t = +value.top || 0;
r = +value.right || 0;
b = +value.bottom || 0;
l = +value.left || 0;
} else {
t = r = b = l = +value || 0;
}
return {
top: t,
right: r,
bottom: b,
left: l,
height: t + b,
width: l + r
};
},
/**
* Parses font options and returns the font object.
* @param {object} options - A object that contains font options to be parsed.
* @return {object} The font object.
* @todo Support font.* options and renamed to toFont().
* @private
*/
_parseFont: function(options) {
var globalDefaults = defaults.global;
var size = valueOrDefault(options.fontSize, globalDefaults.defaultFontSize);
var font = {
family: valueOrDefault(options.fontFamily, globalDefaults.defaultFontFamily),
lineHeight: helpers.options.toLineHeight(valueOrDefault(options.lineHeight, globalDefaults.defaultLineHeight), size),
size: size,
style: valueOrDefault(options.fontStyle, globalDefaults.defaultFontStyle),
weight: null,
string: ''
};
font.string = toFontString(font);
return font;
},
/**
* Evaluates the given `inputs` sequentially and returns the first defined value.
* @param {Array} inputs - An array of values, falling back to the last value.
* @param {object} [context] - If defined and the current value is a function, the value
* is called with `context` as first argument and the result becomes the new input.
* @param {number} [index] - If defined and the current value is an array, the value
* at `index` become the new input.
* @since 2.7.0
*/
resolve: function(inputs, context, index) {
var i, ilen, value;
for (i = 0, ilen = inputs.length; i < ilen; ++i) {
value = inputs[i];
if (value === undefined) {
continue;
}
if (context !== undefined && typeof value === 'function') {
value = value(context);
}
if (index !== undefined && helpers.isArray(value)) {
value = value[index];
}
if (value !== undefined) {
return value;
}
}
}
};