| 1 |
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| 2 |
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| 3 | const string = require('../../utils/string')
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| 4 |
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| 5 | function factory (type, config, load, typed) {
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| 6 | /**
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| 7 | * Format a value of any type into a string.
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| 8 | *
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| 9 | * Syntax:
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| 10 | *
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| 11 | * math.format(value)
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| 12 | * math.format(value, options)
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| 13 | * math.format(value, precision)
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| 14 | * math.format(value, callback)
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| 15 | *
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| 16 | * Where:
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| 17 | *
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| 18 | * - `value: *`
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| 19 | * The value to be formatted
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| 20 | * - `options: Object`
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| 21 | * An object with formatting options. Available options:
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| 22 | * - `notation: string`
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| 23 | * Number notation. Choose from:
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| 24 | * - 'fixed'
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| 25 | * Always use regular number notation.
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| 26 | * For example '123.40' and '14000000'
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| 27 | * - 'exponential'
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| 28 | * Always use exponential notation.
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| 29 | * For example '1.234e+2' and '1.4e+7'
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| 30 | * - 'engineering'
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| 31 | * Always use engineering notation.
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| 32 | * For example '123.4e+0' and '14.0e+6'
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| 33 | * - 'auto' (default)
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| 34 | * Regular number notation for numbers having an absolute value between
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| 35 | * `lower` and `upper` bounds, and uses exponential notation elsewhere.
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| 36 | * Lower bound is included, upper bound is excluded.
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| 37 | * For example '123.4' and '1.4e7'.
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| 38 | * - `precision: number`
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| 39 | * A number between 0 and 16 to round the digits of the number. In case
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| 40 | * of notations 'exponential', 'engineering', and 'auto', `precision`
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| 41 | * defines the total number of significant digits returned.
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| 42 | * In case of notation 'fixed', `precision` defines the number of
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| 43 | * significant digits after the decimal point.
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| 44 | * `precision` is undefined by default.
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| 45 | * - `lowerExp: number`
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| 46 | * Exponent determining the lower boundary for formatting a value with
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| 47 | * an exponent when `notation='auto`. Default value is `-3`.
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| 48 | * - `upperExp: number`
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| 49 | * Exponent determining the upper boundary for formatting a value with
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| 50 | * an exponent when `notation='auto`. Default value is `5`.
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| 51 | * - `fraction: string`. Available values: 'ratio' (default) or 'decimal'.
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| 52 | * For example `format(fraction(1, 3))` will output '1/3' when 'ratio' is
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| 53 | * configured, and will output `0.(3)` when 'decimal' is configured.
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| 54 | * - `callback: function`
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| 55 | * A custom formatting function, invoked for all numeric elements in `value`,
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| 56 | * for example all elements of a matrix, or the real and imaginary
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| 57 | * parts of a complex number. This callback can be used to override the
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| 58 | * built-in numeric notation with any type of formatting. Function `callback`
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| 59 | * is called with `value` as parameter and must return a string.
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| 60 | *
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| 61 | * When `value` is an Object:
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| 62 | *
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| 63 | * - When the object contains a property `format` being a function, this function
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| 64 | * is invoked as `value.format(options)` and the result is returned.
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| 65 | * - When the object has its own `toString` method, this method is invoked
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| 66 | * and the result is returned.
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| 67 | * - In other cases the function will loop over all object properties and
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| 68 | * return JSON object notation like '{"a": 2, "b": 3}'.
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| 69 | *
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| 70 | * When value is a function:
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| 71 | *
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| 72 | * - When the function has a property `syntax`, it returns this
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| 73 | * syntax description.
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| 74 | * - In other cases, a string `'function'` is returned.
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| 75 | *
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| 76 | * Examples:
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| 77 | *
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| 78 | * math.format(6.4) // returns '6.4'
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| 79 | * math.format(1240000) // returns '1.24e6'
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| 80 | * math.format(1/3) // returns '0.3333333333333333'
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| 81 | * math.format(1/3, 3) // returns '0.333'
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| 82 | * math.format(21385, 2) // returns '21000'
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| 83 | * math.format(12e8, {notation: 'fixed'}) // returns '1200000000'
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| 84 | * math.format(2.3, {notation: 'fixed', precision: 4}) // returns '2.3000'
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| 85 | * math.format(52.8, {notation: 'exponential'}) // returns '5.28e+1'
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| 86 | * math.format(12400,{notation: 'engineering'}) // returns '12.400e+3'
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| 87 | * math.format(2000, {lowerExp: -2, upperExp: 2}) // returns '2e+3'
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| 88 | *
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| 89 | * function formatCurrency(value) {
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| 90 | * // return currency notation with two digits:
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| 91 | * return '$' + value.toFixed(2)
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| 92 | *
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| 93 | * // you could also use math.format inside the callback:
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| 94 | * // return '$' + math.format(value, {notation: 'fixed', precision: 2})
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| 95 | * }
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| 96 | * math.format([2.1, 3, 0.016], formatCurrency} // returns '[$2.10, $3.00, $0.02]'
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| 97 | *
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| 98 | * See also:
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| 99 | *
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| 100 | * print
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| 101 | *
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| 102 | * @param {*} value Value to be stringified
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| 103 | * @param {Object | Function | number} [options] Formatting options
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| 104 | * @return {string} The formatted value
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| 105 | */
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| 106 | const format = typed('format', {
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| 107 | 'any': string.format,
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| 108 | 'any, Object | function | number': string.format
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| 109 | })
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| 110 |
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| 111 | format.toTex = undefined // use default template
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| 112 |
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| 113 | return format
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| 114 | }
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| 115 |
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| 116 | exports.name = 'format'
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| 117 | exports.factory = factory
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