the giant refactoring: split wallet into multiple parts

1 files changed, 0 insertions, 340 deletions

diff --git a/src/amounts.ts b/src/amounts.ts
deleted file mode 100644
index b90d54a31..000000000
--- a/src/amounts.ts
+++ /dev/null
@@ -1,340 +0,0 @@
-/*
- This file is part of TALER
- (C) 2018 GNUnet e.V. and INRIA
-
- TALER is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 3, or (at your option) any later version.
-
- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along with
- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
- */
-
-
-/**
- * Types and helper functions for dealing with Taler amounts.
- */
-
-
-/**
- * Imports.
- */
-import { Checkable } from "./checkable";
-
-
-/**
- * Number of fractional units that one value unit represents.
- */
-export const fractionalBase = 1e8;
-
-/**
- * How many digits behind the comma are required to represent the
- * fractional value in human readable decimal format?  Must match
- * lg(fractionalBase)
- */
-export const fractionalLength = 8;
-
-/**
- * Maximum allowed value field of an amount.
- */
-export const maxAmountValue = 2 ** 52;
-
-
-/**
- * Non-negative financial amount.  Fractional values are expressed as multiples
- * of 1e-8.
- */
-@Checkable.Class()
-export class AmountJson {
-  /**
-   * Value, must be an integer.
-   */
-  @Checkable.Number()
-  readonly value: number;
-
-  /**
-   * Fraction, must be an integer.  Represent 1/1e8 of a unit.
-   */
-  @Checkable.Number()
-  readonly fraction: number;
-
-  /**
-   * Currency of the amount.
-   */
-  @Checkable.String()
-  readonly currency: string;
-
-  /**
-   * Verify that a value matches the schema of this class and convert it into a
-   * member.
-   */
-  static checked: (obj: any) => AmountJson;
-}
-
-
-/**
- * Result of a possibly overflowing operation.
- */
-export interface Result {
-  /**
-   * Resulting, possibly saturated amount.
-   */
-  amount: AmountJson;
-  /**
-   * Was there an over-/underflow?
-   */
-  saturated: boolean;
-}
-
-
-/**
- * Get an amount that represents zero units of a currency.
- */
-export function getZero(currency: string): AmountJson {
-  return {
-    currency,
-    fraction: 0,
-    value: 0,
-  };
-}
-
-
-export function sum(amounts: AmountJson[]) {
-  if (amounts.length <= 0) {
-    throw Error("can't sum zero amounts");
-  }
-  return add(amounts[0], ...amounts.slice(1));
-}
-
-
-/**
- * Add two amounts.  Return the result and whether
- * the addition overflowed.  The overflow is always handled
- * by saturating and never by wrapping.
- *
- * Throws when currencies don't match.
- */
-export function add(first: AmountJson, ...rest: AmountJson[]): Result {
-  const currency = first.currency;
-  let value = first.value + Math.floor(first.fraction / fractionalBase);
-  if (value > maxAmountValue) {
-    return {
-      amount: { currency, value: maxAmountValue, fraction: fractionalBase - 1 },
-      saturated: true
-    };
-  }
-  let fraction = first.fraction % fractionalBase;
-  for (const x of rest) {
-    if (x.currency !== currency) {
-      throw Error(`Mismatched currency: ${x.currency} and ${currency}`);
-    }
-
-    value = value + x.value + Math.floor((fraction + x.fraction) / fractionalBase);
-    fraction = Math.floor((fraction + x.fraction) % fractionalBase);
-    if (value > maxAmountValue) {
-      return {
-        amount: { currency, value: maxAmountValue, fraction: fractionalBase - 1 },
-        saturated: true
-      };
-    }
-  }
-  return { amount: { currency, value, fraction }, saturated: false };
-}
-
-
-/**
- * Subtract two amounts.  Return the result and whether
- * the subtraction overflowed.  The overflow is always handled
- * by saturating and never by wrapping.
- *
- * Throws when currencies don't match.
- */
-export function sub(a: AmountJson, ...rest: AmountJson[]): Result {
-  const currency = a.currency;
-  let value = a.value;
-  let fraction = a.fraction;
-
-  for (const b of rest) {
-    if (b.currency !== currency) {
-      throw Error(`Mismatched currency: ${b.currency} and ${currency}`);
-    }
-    if (fraction < b.fraction) {
-      if (value < 1) {
-        return { amount: { currency, value: 0, fraction: 0 }, saturated: true };
-      }
-      value--;
-      fraction += fractionalBase;
-    }
-    console.assert(fraction >= b.fraction);
-    fraction -= b.fraction;
-    if (value < b.value) {
-      return { amount: { currency, value: 0, fraction: 0 }, saturated: true };
-    }
-    value -= b.value;
-  }
-
-  return { amount: { currency, value, fraction }, saturated: false };
-}
-
-
-/**
- * Compare two amounts.  Returns 0 when equal, -1 when a < b
- * and +1 when a > b.  Throws when currencies don't match.
- */
-export function cmp(a: AmountJson, b: AmountJson): number {
-  if (a.currency !== b.currency) {
-    throw Error(`Mismatched currency: ${a.currency} and ${b.currency}`);
-  }
-  const av = a.value + Math.floor(a.fraction / fractionalBase);
-  const af = a.fraction % fractionalBase;
-  const bv = b.value + Math.floor(b.fraction / fractionalBase);
-  const bf = b.fraction % fractionalBase;
-  switch (true) {
-    case av < bv:
-      return -1;
-    case av > bv:
-      return 1;
-    case af < bf:
-      return -1;
-    case af > bf:
-      return 1;
-    case af === bf:
-      return 0;
-    default:
-      throw Error("assertion failed");
-  }
-}
-
-
-/**
- * Create a copy of an amount.
- */
-export function copy(a: AmountJson): AmountJson {
-  return {
-    currency: a.currency,
-    fraction: a.fraction,
-    value: a.value,
-  };
-}
-
-
-/**
- * Divide an amount.  Throws on division by zero.
- */
-export function divide(a: AmountJson, n: number): AmountJson {
-  if (n === 0) {
-    throw Error(`Division by 0`);
-  }
-  if (n === 1) {
-    return {value: a.value, fraction: a.fraction, currency: a.currency};
-  }
-  const r = a.value % n;
-  return {
-    currency: a.currency,
-    fraction: Math.floor(((r * fractionalBase) + a.fraction) / n),
-    value: Math.floor(a.value / n),
-  };
-}
-
-
-/**
- * Check if an amount is non-zero.
- */
-export function isNonZero(a: AmountJson): boolean {
-  return a.value > 0 || a.fraction > 0;
-}
-
-
-/**
- * Parse an amount like 'EUR:20.5' for 20 Euros and 50 ct.
- */
-export function parse(s: string): AmountJson|undefined {
-  const res = s.match(/^([a-zA-Z0-9_*-]+):([0-9]+)([.][0-9]+)?$/);
-  if (!res) {
-    return undefined;
-  }
-  const tail = res[3] || ".0";
-  if (tail.length > fractionalLength + 1) {
-    return undefined;
-  }
-  let value = Number.parseInt(res[2]);
-  if (value > maxAmountValue) {
-    return undefined;
-  }
-  return {
-    currency: res[1],
-    fraction: Math.round(fractionalBase * Number.parseFloat(tail)),
-    value,
-  };
-}
-
-
-/**
- * Parse amount in standard string form (like 'EUR:20.5'),
- * throw if the input is not a valid amount.
- */
-export function parseOrThrow(s: string): AmountJson {
-  const res = parse(s);
-  if (!res) {
-    throw Error(`Can't parse amount: "${s}"`);
-  }
-  return res;
-}
-
-
-/**
- * Convert a float to a Taler amount.
- * Loss of precision possible.
- */
-export function fromFloat(floatVal: number, currency: string) {
-  return {
-    currency,
-    fraction: Math.floor((floatVal - Math.floor(floatVal)) * fractionalBase),
-    value: Math.floor(floatVal),
-  };
-}
-
-
-/**
- * Convert to standard human-readable string representation that's
- * also used in JSON formats.
- */
-export function toString(a: AmountJson): string {
-  const av = a.value + Math.floor(a.fraction / fractionalBase);
-  const af = a.fraction % fractionalBase;
-  let s = av.toString()
-
-  if (af) {
-    s = s + ".";
-    let n = af;
-    for (let i = 0; i < fractionalLength; i++) {
-      if (!n) {
-        break;
-      }
-      s = s + Math.floor(n / fractionalBase * 10).toString();
-      n = (n * 10) % fractionalBase;
-    }
-  }
-
-  return `${a.currency}:${s}`;
-}
-
-
-/**
- * Check if the argument is a valid amount in string form.
- */
-export function check(a: any): boolean {
-  if (typeof a !== "string") {
-    return false;
-  }
-  try {
-    const parsedAmount = parse(a);
-    return !!parsedAmount;
-  } catch {
-    return false;
-  }
-}