103 lines
3 KiB
Rust
103 lines
3 KiB
Rust
/*
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* This file is part of ActivityStreams Types.
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*
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* Copyright © 2020 Riley Trautman
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*
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* ActivityStreams Types is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ActivityStreams Types is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ActivityStreams Types. If not, see <http://www.gnu.org/licenses/>.
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*/
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/// The type xsd:float represents an IEEE single-precision 32-bit floating-point number.
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///
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/// TODO: handle exponents, infinity, not-a-number
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///
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/// The format of xsd:float values is a mantissa (a number which conforms to the type decimal)
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/// followed, optionally, by the character "E" or "e" followed by an exponent. The exponent must be
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/// an integer. For example, 3E2 represents 3 times 10 to the 2nd power, or 300. The exponent must
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/// be an integer.
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///
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/// In addition, the following values are valid: INF (infinity), -INF (negative infinity), and NaN
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/// (Not a Number). INF is considered to be greater than all other values, while -INF is less than
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/// all other values. The value NaN cannot be compared to any other values, although it equals
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/// itself.
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#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
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#[serde(transparent)]
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pub struct XsdFloat(f64);
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/// The error type produced when an XsdFloat cannot be parsed
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#[derive(Clone, Debug, thiserror::Error)]
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#[error("Error parsing Float")]
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pub struct XsdFloatError;
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impl AsRef<f64> for XsdFloat {
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fn as_ref(&self) -> &f64 {
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&self.0
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}
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}
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impl AsMut<f64> for XsdFloat {
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fn as_mut(&mut self) -> &mut f64 {
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&mut self.0
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}
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}
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impl From<f64> for XsdFloat {
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fn from(f: f64) -> Self {
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XsdFloat(f)
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}
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}
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impl From<XsdFloat> for f64 {
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fn from(f: XsdFloat) -> Self {
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f.0
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}
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}
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impl std::convert::TryFrom<String> for XsdFloat {
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type Error = XsdFloatError;
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fn try_from(s: String) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::convert::TryFrom<&str> for XsdFloat {
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type Error = XsdFloatError;
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fn try_from(s: &str) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::convert::TryFrom<&mut str> for XsdFloat {
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type Error = XsdFloatError;
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fn try_from(s: &mut str) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::str::FromStr for XsdFloat {
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type Err = XsdFloatError;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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Ok(XsdFloat(s.parse().map_err(|_| XsdFloatError)?))
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}
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}
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impl std::fmt::Display for XsdFloat {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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std::fmt::Display::fmt(&self.0, f)
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}
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}
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