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use range::Range;
use std::io;
use MetaData;
pub fn write<W>(w: &mut W, data: &[Range<MetaData>]) -> Result<(), io::Error>
where W: io::Write
{
use std::cmp::{ min, max };
let indent_offset = 0;
let starts = data.iter()
.filter(|x| if let MetaData::StartNode(_) = x.data { true } else { false })
.count() as u32;
let ends = data.iter()
.filter(|x| if let MetaData::EndNode(_) = x.data { true } else { false })
.count() as u32;
let mut indent: u32 = max(starts, ends) - min(starts, ends);
let mut first = true;
for (i, d) in data.iter().enumerate() {
let d = &d.data;
let is_end = if let MetaData::EndNode(_) = *d {
indent -= 1;
true
} else { false };
let print_comma = !first && !is_end;
if print_comma {
try!(writeln!(w, ","));
} else if i != 0 {
try!(writeln!(w, ""));
}
first = false;
for _ in 0 .. indent_offset + indent {
try!(write!(w, " "));
}
match *d {
MetaData::StartNode(ref name) => {
first = true;
try!(write_string(w, name));
try!(write!(w, ":{}", "{"));
indent += 1;
}
MetaData::EndNode(_) => {
try!(write!(w, "{}", "}"));
}
MetaData::Bool(ref name, val) => {
try!(write_string(w, name));
try!(write!(w, ":{}", val));
}
MetaData::F64(ref name, val) => {
try!(write_string(w, name));
try!(write!(w, ":{}", val));
}
MetaData::String(ref name, ref val) => {
try!(write_string(w, name));
try!(write!(w, ":"));
try!(write_string(w, val));
}
}
}
try!(writeln!(w, ""));
Ok(())
}
pub fn write_string<W>(w: &mut W, val: &str) -> Result<(), io::Error>
where W: io::Write
{
try!(write!(w, "\""));
for c in val.chars() {
if c == '\\' {
try!(write!(w, "\\\\"));
} else if c == '\"' {
try!(write!(w, "\\\""));
} else {
try!(write!(w, "{}", c));
}
}
try!(write!(w, "\""));
Ok(())
}
pub fn print(data: &[Range<MetaData>]) {
use std::io::stdout;
write(&mut stdout(), data).unwrap();
}
#[cfg(test)]
mod tests {
use super::*;
use MetaData;
use range::Range;
use std::sync::Arc;
#[test]
fn numbers() {
let mut s: Vec<u8> = vec![];
let r = Range::empty(0);
write(&mut s, &[
r.wrap(MetaData::F64(Arc::new("x".into()), 1.0)),
r.wrap(MetaData::F64(Arc::new("y".into()), 2.0)),
r.wrap(MetaData::F64(Arc::new("z".into()), 3.0))
]).unwrap();
assert_eq!(String::from_utf8(s).unwrap(),
"\"x\":1,\n\"y\":2,\n\"z\":3\n");
}
#[test]
fn node() {
let mut s: Vec<u8> = vec![];
let r = Range::empty(0);
write(&mut s, &[
r.wrap(MetaData::StartNode(Arc::new("pos".into()))),
r.wrap(MetaData::F64(Arc::new("x".into()), 1.0)),
r.wrap(MetaData::F64(Arc::new("y".into()), 2.0)),
r.wrap(MetaData::F64(Arc::new("z".into()), 3.0)),
r.wrap(MetaData::EndNode(Arc::new("pos".into())))
]).unwrap();
assert_eq!(String::from_utf8(s).unwrap(),
"\"pos\":{\n \"x\":1,\n \"y\":2,\n \"z\":3\n}\n");
}
#[test]
fn node2() {
let mut s: Vec<u8> = vec![];
let r = Range::empty(0);
write(&mut s, &[
r.wrap(MetaData::StartNode(Arc::new("pos".into()))),
r.wrap(MetaData::F64(Arc::new("x".into()), 1.0)),
r.wrap(MetaData::EndNode(Arc::new("pos".into()))),
r.wrap(MetaData::StartNode(Arc::new("pos".into()))),
r.wrap(MetaData::F64(Arc::new("x".into()), 1.0)),
r.wrap(MetaData::EndNode(Arc::new("pos".into())))
]).unwrap();
assert_eq!(String::from_utf8(s).unwrap(),
"\"pos\":{\n \"x\":1\n},\n\"pos\":{\n \"x\":1\n}\n");
}
}