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feat: Tree view of Predicate result (Case)
Finnaly, Fixes assert-rs#7. Inspired by the work in assert-rs#39. Created softprops/treeline#3 for trying to find ways to make this more efficient.
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extern crate predicates; | ||
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use predicates::prelude::*; | ||
use predicates::tree::CaseTreeExt; | ||
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fn main() { | ||
let pred = predicate::ne(5).not().and(predicate::ge(5)); | ||
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let var = 5; | ||
let case = pred.find_case(true, &var); | ||
if let Some(case) = case { | ||
println!("var is {}", var); | ||
println!("{}", case.tree()); | ||
} | ||
} |
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// Copyright (c) 2018 The predicates-rs Project Developers. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/license/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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//! Render `Case` as a tree. | ||
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use std::fmt; | ||
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use treeline; | ||
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use reflection; | ||
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/// Render `Self` as a displayable tree. | ||
pub trait CaseTreeExt { | ||
/// Render `Self` as a displayable tree. | ||
fn tree(&self) -> CaseTree; | ||
} | ||
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impl<'a> CaseTreeExt for reflection::Case<'a> { | ||
fn tree(&self) -> CaseTree { | ||
CaseTree(convert(self)) | ||
} | ||
} | ||
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type CaseTreeInner = treeline::Tree<Box<fmt::Display>>; | ||
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fn convert<'a>(case: &reflection::Case<'a>) -> CaseTreeInner { | ||
let mut leaves: Vec<CaseTreeInner> = vec![]; | ||
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leaves.extend(case.predicate().iter().flat_map(|pred| { | ||
pred.parameters().map(|item| { | ||
let root: Box<fmt::Display> = Box::new(item.to_string()); | ||
treeline::Tree::new(root, vec![]) | ||
}) | ||
})); | ||
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leaves.extend(case.products().map(|item| { | ||
let root: Box<fmt::Display> = Box::new(item.to_string()); | ||
treeline::Tree::new(root, vec![]) | ||
})); | ||
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leaves.extend(case.children().map(|item| convert(item))); | ||
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let root = Box::new(case.predicate().map(|p| p.to_string()).unwrap_or_default()); | ||
CaseTreeInner::new(root, leaves) | ||
} | ||
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/// A `Case` rendered as a tree for display. | ||
#[allow(missing_debug_implementations)] | ||
pub struct CaseTree(CaseTreeInner); | ||
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impl fmt::Display for CaseTree { | ||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
self.0.fmt(f) | ||
} | ||
} |