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fix: put all parsing and stringification into the wallet ui
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| // @ts-check | ||
| import JSON5 from 'json5'; | ||
| import { assert, details } from '@agoric/assert'; | ||
| import { MathKind } from '@agoric/ertp'; | ||
|
|
||
| const CONVENTIONAL_DECIMAL_PLACES = 2; | ||
|
|
||
| /** | ||
| * @typedef {{ amountMathKind?: AmountMathKind } & DisplayInfo} AmountDisplayInfo | ||
| */ | ||
|
|
||
| /** | ||
| * | ||
| * @param {string} str | ||
| * @param {AmountDisplayInfo} displayInfo | ||
| */ | ||
| export function parseValue(str, displayInfo) { | ||
| const { amountMathKind = MathKind.NAT, decimalPlaces = 0 } = displayInfo || {}; | ||
|
|
||
| assert.typeof( | ||
| str, | ||
| 'string', | ||
| details`valueString ${str} is not a string`, | ||
| ); | ||
|
|
||
| if (amountMathKind !== MathKind.NAT) { | ||
| // Punt to JSON5 parsing. | ||
| return JSON5.parse(str); | ||
| } | ||
|
|
||
| // Parse the string as a number. | ||
| const match = str.match(/^0*(\d+)(\.(\d*[1-9])?0*)?$/); | ||
| assert( | ||
| match, | ||
| details`${str} must be a non-negative decimal number`, | ||
| ); | ||
|
|
||
| const unitstr = match[1]; | ||
| const dec0str = match[3] || ''; | ||
| const dec0str0 = dec0str.padEnd(decimalPlaces, '0'); | ||
| assert( | ||
| dec0str0.length <= decimalPlaces, | ||
| details`${str} exceeds ${decimalPlaces} decimal places`, | ||
| ); | ||
|
|
||
| return parseInt(`${unitstr}${dec0str0}`, 10); | ||
| } | ||
|
|
||
| /** | ||
| * | ||
| * @param {any} value | ||
| * @param {AmountDisplayInfo} [displayInfo] | ||
| * @returns {string} | ||
| */ | ||
| export function stringifyValue(value, displayInfo = undefined) { | ||
| const { amountMathKind = MathKind.NAT, decimalPlaces = 0 } = displayInfo || {}; | ||
|
|
||
| if (amountMathKind !== MathKind.NAT) { | ||
| // Just return the size of the set. | ||
| return `${value.length}`; | ||
| } | ||
|
|
||
| const bValue = BigInt(value); | ||
| if (!decimalPlaces) { | ||
| // Nothing else to do. | ||
| return `${bValue}`; | ||
| } | ||
|
|
||
| const bScale = BigInt(10) ** BigInt(decimalPlaces); | ||
|
|
||
| // Take integer division of the value by the scale. | ||
| const unitstr = `${bValue / bScale}`; | ||
|
|
||
| // Find the remainder of the value divided by the scale. | ||
| const bDecimals = BigInt(bValue % bScale) | ||
|
|
||
| // Create the decimal string. | ||
| const decstr = `${bDecimals}` | ||
| // Convert 100 to '0000100'. | ||
| .padStart(decimalPlaces, '0') | ||
| // Trim off trailing zeros. | ||
| .replace(/0+$/, '') | ||
| // Ensure we have at least CONVENTIONAL_DECIMAL_PLACES. | ||
| .padEnd(CONVENTIONAL_DECIMAL_PLACES, '0'); | ||
|
|
||
| if (!decstr) { | ||
| // No decimals to display. | ||
| return `${unitstr}`; | ||
| } | ||
|
|
||
| // Display a decimal point with the units and decimals. | ||
| return `${unitstr}.${decstr}`; | ||
| } |
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