239 lines
6.4 KiB
Rust
239 lines
6.4 KiB
Rust
// Copyright 2016 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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use chrono::SecondsFormat;
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use itertools::Itertools;
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use pretty;
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use std::borrow::Cow;
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use std::io;
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use crate::types::Value;
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impl Value {
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/// Return a pretty string representation of this `Value`.
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pub fn to_pretty(&self, width: usize) -> Result<String, io::Error> {
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let mut out = Vec::new();
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self.write_pretty(width, &mut out)?;
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Ok(String::from_utf8_lossy(&out).into_owned())
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}
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/// Write a pretty representation of this `Value` to the given writer.
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fn write_pretty<W>(&self, width: usize, out: &mut W) -> Result<(), io::Error>
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where
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W: io::Write,
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{
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self.as_doc(&pretty::BoxAllocator).1.render(width, out)
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}
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/// Bracket a collection of values.
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///
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/// We aim for
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/// [1 2 3]
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/// and fall back if necessary to
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/// [1,
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/// 2,
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/// 3].
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fn bracket<'a, A, T, I>(
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&'a self,
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allocator: &'a A,
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open: T,
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vs: I,
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close: T,
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) -> pretty::DocBuilder<'a, A>
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where
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A: pretty::DocAllocator<'a>,
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<A as pretty::DocAllocator<'a>>::Doc: std::clone::Clone,
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T: Into<Cow<'a, str>>,
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I: IntoIterator<Item = &'a Value>,
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{
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let open = open.into();
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let n = open.len() as isize;
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let i = vs
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.into_iter()
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.map(|v| v.as_doc(allocator))
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.intersperse(allocator.line());
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allocator
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.text(open)
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.append(allocator.concat(i).nest(n))
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.append(allocator.text(close))
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.group()
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}
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/// Recursively traverses this value and creates a pretty.rs document.
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/// A pretty printing implementation for edn queries optimized for
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/// readability and limited whitespace expansion.
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fn as_doc<'a, A>(&'a self, pp: &'a A) -> pretty::DocBuilder<'a, A>
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where
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A: pretty::DocAllocator<'a>,
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<A as pretty::DocAllocator<'a>>::Doc: std::clone::Clone,
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{
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match *self {
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Value::Vector(ref vs) => self.bracket(pp, "[", vs, "]"),
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Value::List(ref vs) => self.bracket(pp, "(", vs, ")"),
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Value::Set(ref vs) => self.bracket(pp, "#{", vs, "}"),
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Value::Map(ref vs) => {
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let xs = vs
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.iter()
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.rev()
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.map(|(k, v)| k.as_doc(pp).append(pp.line()).append(v.as_doc(pp)).group())
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.intersperse(pp.line());
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pp.text("{")
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.append(pp.concat(xs).nest(1))
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.append(pp.text("}"))
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.group()
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}
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Value::NamespacedSymbol(ref v) => pp.text(v.namespace()).append("/").append(v.name()),
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Value::PlainSymbol(ref v) => pp.text(v.to_string()),
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Value::Keyword(ref v) => pp.text(v.to_string()),
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Value::Text(ref v) => pp.text("\"").append(v.as_str()).append("\""),
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Value::Uuid(ref u) => pp
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.text("#uuid \"")
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.append(u.to_hyphenated().to_string())
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.append("\""),
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Value::Instant(ref v) => pp
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.text("#inst \"")
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.append(v.to_rfc3339_opts(SecondsFormat::AutoSi, true))
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.append("\""),
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_ => pp.text(self.to_string()),
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}
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}
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}
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#[cfg(test)]
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mod test {
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use crate::parse;
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#[test]
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fn test_pp_io() {
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let string = "$";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(data.write_pretty(40, &mut Vec::new()).is_ok(), true);
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}
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#[test]
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fn test_pp_types_empty() {
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let string = "[ [ ] ( ) #{ } { }, \"\" ]";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(data.to_pretty(40).unwrap(), "[[] () #{} {} \"\"]");
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}
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#[test]
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fn test_vector() {
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let string = "[1 2 3 4 5 6]";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(data.to_pretty(20).unwrap(), "[1 2 3 4 5 6]");
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assert_eq!(
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data.to_pretty(10).unwrap(),
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"\
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[1
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2
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3
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4
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5
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6]"
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);
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}
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#[test]
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fn test_map() {
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let string = "{:a 1 :b 2 :c 3}";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(data.to_pretty(20).unwrap(), "{:a 1 :b 2 :c 3}");
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assert_eq!(
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data.to_pretty(10).unwrap(),
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"\
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{:a 1
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:b 2
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:c 3}"
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);
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}
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#[test]
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fn test_pp_types() {
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let string = "[ 1 2 ( 3.14 ) #{ 4N } { foo/bar 42 :baz/boz 43 } [ ] :five :six/seven eight nine/ten true false nil #f NaN #f -Infinity #f +Infinity ]";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(
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data.to_pretty(40).unwrap(),
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"\
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[1
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2
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(3.14)
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#{4N}
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{:baz/boz 43 foo/bar 42}
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[]
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:five
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:six/seven
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eight
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nine/ten
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true
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false
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nil
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#f NaN
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#f -Infinity
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#f +Infinity]"
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);
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}
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#[test]
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fn test_pp_query1() {
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let string = "[:find ?id ?bar ?baz :in $ :where [?id :session/keyword-foo ?symbol1 ?symbol2 \"some string\"] [?tx :db/tx ?ts]]";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(
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data.to_pretty(40).unwrap(),
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"\
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[:find
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?id
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?bar
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?baz
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:in
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$
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:where
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[?id
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:session/keyword-foo
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?symbol1
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?symbol2
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\"some string\"]
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[?tx :db/tx ?ts]]"
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);
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}
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#[test]
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fn test_pp_query2() {
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let string = "[:find [?id ?bar ?baz] :in [$] :where [?id :session/keyword-foo ?symbol1 ?symbol2 \"some string\"] [?tx :db/tx ?ts] (not-join [?id] [?id :session/keyword-bar _])]";
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let data = parse::value(string).unwrap().without_spans();
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assert_eq!(
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data.to_pretty(40).unwrap(),
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"\
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[:find
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[?id ?bar ?baz]
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:in
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[$]
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:where
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[?id
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:session/keyword-foo
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?symbol1
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?symbol2
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\"some string\"]
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[?tx :db/tx ?ts]
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(not-join
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[?id]
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[?id :session/keyword-bar _])]"
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);
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}
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}
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