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43bd5a56ff
We use crate renaming to remove grin prefix, as result imports for util and keychain crates start with crate:: which looks like a part of the current crate. This PR fixes it. Also some small improvements were made. If this approach works I'll replicate it to other crates.
139 lines
4.2 KiB
Rust
139 lines
4.2 KiB
Rust
// Copyright 2019 The Grin Developers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Core types
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pub mod block;
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pub mod block_sums;
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pub mod committed;
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pub mod compact_block;
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pub mod hash;
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pub mod id;
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pub mod merkle_proof;
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pub mod pmmr;
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pub mod transaction;
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pub mod verifier_cache;
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use crate::consensus::GRIN_BASE;
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use util::secp::pedersen::Commitment;
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pub use self::block::*;
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pub use self::block_sums::*;
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pub use self::committed::Committed;
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pub use self::compact_block::*;
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pub use self::id::ShortId;
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pub use self::transaction::*;
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/// Common errors
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#[derive(Fail, Debug)]
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pub enum Error {
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/// Human readable represenation of amount is invalid
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#[fail(display = "Amount string was invalid")]
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InvalidAmountString,
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}
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/// Common method for parsing an amount from human-readable, and converting
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/// to internally-compatible u64
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pub fn amount_from_hr_string(amount: &str) -> Result<u64, Error> {
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// no i18n yet, make sure we use '.' as the separator
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if amount.find(',').is_some() {
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return Err(Error::InvalidAmountString);
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}
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let (grins, ngrins) = match amount.find('.') {
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None => (parse_grins(amount)?, 0),
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Some(pos) => {
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let (gs, tail) = amount.split_at(pos);
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(parse_grins(gs)?, parse_ngrins(&tail[1..])?)
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}
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};
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Ok(grins * GRIN_BASE + ngrins)
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}
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fn parse_grins(amount: &str) -> Result<u64, Error> {
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if amount == "" {
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Ok(0)
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} else {
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amount
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.parse::<u64>()
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.map_err(|_| Error::InvalidAmountString)
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}
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}
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lazy_static! {
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static ref WIDTH: usize = (GRIN_BASE as f64).log(10.0) as usize + 1;
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}
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fn parse_ngrins(amount: &str) -> Result<u64, Error> {
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let amount = if amount.len() > *WIDTH {
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&amount[..*WIDTH]
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} else {
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amount
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};
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format!("{:0<width$}", amount, width = WIDTH)
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.parse::<u64>()
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.map_err(|_| Error::InvalidAmountString)
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}
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/// Common method for converting an amount to a human-readable string
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pub fn amount_to_hr_string(amount: u64, truncate: bool) -> String {
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let amount = (amount as f64 / GRIN_BASE as f64) as f64;
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let hr = format!("{:.*}", WIDTH, amount);
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if truncate {
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let nzeros = hr.chars().rev().take_while(|x| x == &'0').count();
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if nzeros < *WIDTH {
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return hr.trim_end_matches('0').to_string();
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} else {
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return format!("{}0", hr.trim_end_matches('0'));
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}
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}
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hr
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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pub fn test_amount_from_hr() {
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assert!(50123456789 == amount_from_hr_string("50.123456789").unwrap());
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assert!(50123456789 == amount_from_hr_string("50.1234567899").unwrap());
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assert!(50 == amount_from_hr_string(".000000050").unwrap());
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assert!(1 == amount_from_hr_string(".000000001").unwrap());
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assert!(0 == amount_from_hr_string(".0000000009").unwrap());
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assert!(500_000_000_000 == amount_from_hr_string("500").unwrap());
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assert!(
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5_000_000_000_000_000_000 == amount_from_hr_string("5000000000.00000000000").unwrap()
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);
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assert!(66_600_000_000 == amount_from_hr_string("66.6").unwrap());
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assert!(66_000_000_000 == amount_from_hr_string("66.").unwrap());
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}
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#[test]
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pub fn test_amount_to_hr() {
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assert!("50.123456789" == amount_to_hr_string(50123456789, false));
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assert!("50.123456789" == amount_to_hr_string(50123456789, true));
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assert!("0.000000050" == amount_to_hr_string(50, false));
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assert!("0.00000005" == amount_to_hr_string(50, true));
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assert!("0.000000001" == amount_to_hr_string(1, false));
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assert!("0.000000001" == amount_to_hr_string(1, true));
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assert!("500.000000000" == amount_to_hr_string(500_000_000_000, false));
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assert!("500.0" == amount_to_hr_string(500_000_000_000, true));
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assert!("5000000000.000000000" == amount_to_hr_string(5_000_000_000_000_000_000, false));
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assert!("5000000000.0" == amount_to_hr_string(5_000_000_000_000_000_000, true));
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assert!("66.6" == amount_to_hr_string(66600000000, true));
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}
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}
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