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Merge pull request #39 from HL7/feature/LF-1351/method-to-quantity
Implement toQuantity(unit)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| let numberFns = {}; | ||
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| // Returns the number of digits in the number after the decimal point, ignoring | ||
| // trailing zeros. | ||
| function decimalPlaces(x) { | ||
| // Based on https://stackoverflow.com/a/9539746/360782 | ||
| // Make sure it is a number and use the builtin number -> string. | ||
| const s = "" + (+x), | ||
| match = /(\d+)(?:\.(\d+))?(?:[eE]([+-]?\d+))?$/.exec(s); | ||
| // NaN or Infinity or integer. | ||
| // We arbitrarily decide that Infinity is integral. | ||
| if (!match) { return 0; } | ||
| // Count the number of digits in the fraction and subtract the | ||
| // exponent to simulate moving the decimal point left by exponent places. | ||
| // 1.234e+2 has 1 fraction digit and '234'.length - 2 == 1 | ||
| // 1.234e-2 has 5 fraction digit and '234'.length - -2 == 5 | ||
| //var wholeNum = match[1]; | ||
| const fraction = match[2], | ||
| exponent = match[3]; | ||
| return Math.max( | ||
| 0, // lower limit. | ||
| (fraction === '0' ? 0 : (fraction || '').length) // fraction length | ||
| - (exponent || 0)); // exponent | ||
| } | ||
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| /** | ||
| * Rounds a number to the specified number of decimal places. | ||
| * @param x the decimal number to be rounded | ||
| * @param n the (maximum) number of decimal places to preserve. (The result | ||
| * could contain fewer if the decimal digits in x contain zeros). | ||
| */ | ||
| function roundToDecimalPlaces (x, n) { | ||
| const scale = Math.pow(10, n); | ||
| return Math.round(x*scale)/scale; | ||
| } | ||
|
|
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| /** | ||
| * The smallest representable number in FHIRPath. | ||
| */ | ||
| const PRECISION_STEP = 1e-8; | ||
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| /** | ||
| * Rounds a number to the nearest multiple of PRECISION_STEP. | ||
| */ | ||
| function roundToMaxPrecision(x) { | ||
| return Math.round(x/PRECISION_STEP)*PRECISION_STEP; | ||
| } | ||
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||
| /** | ||
| * Determines numbers equivalence | ||
| * @param {number} actual | ||
| * @param {number} expected | ||
| * @return {boolean} | ||
| */ | ||
| numberFns.isEquivalent = function(actual, expected) { | ||
| if(Number.isInteger(actual) && Number.isInteger(expected)) { | ||
| return actual === expected; | ||
| } | ||
|
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| const prec = Math.min(decimalPlaces(actual), decimalPlaces(expected)); | ||
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| if(prec === 0){ | ||
| return Math.round(actual) === Math.round(expected); | ||
| } else { | ||
| // Note: Number.parseFloat(0.00000011).toPrecision(7) === "1.100000e-7" | ||
| // It does # of significant digits, not decimal places. | ||
| return roundToDecimalPlaces(actual, prec) === | ||
| roundToDecimalPlaces(expected, prec); | ||
| } | ||
| }; | ||
|
|
||
| /** | ||
| * Determines numbers equality | ||
| * @param {number} actual | ||
| * @param {number} expected | ||
| * @return {boolean} | ||
| */ | ||
| numberFns.isEqual = function(actual, expected) { | ||
| return roundToMaxPrecision(actual) === roundToMaxPrecision(expected); | ||
| }; | ||
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| module.exports = numberFns; |
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