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serialize: speed up json pretty printing by batch writing spaces

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This commit is contained in:
Erick Tryzelaar 2014-07-04 16:56:23 -07:00
parent 717de500ee
commit 67c8a8d5dd
1 changed files with 13 additions and 4 deletions
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17
src/libserialize/json.rs
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@ -299,11 +299,20 @@ fn escape_char(writer: &mut io::Writer, v: char) -> Result<(), io::IoError> {
escape_bytes(writer, buf)
}
fn spaces(writer: &mut io::Writer, n: uint) -> Result<(), io::IoError> {
for _ in range(0, n) {
try!(writer.write_str(" "));
fn spaces(wr: &mut io::Writer, mut n: uint) -> Result<(), io::IoError> {
static len: uint = 16;
static buf: [u8, ..len] = [b' ', ..len];
while n >= len {
try!(wr.write(buf));
n -= len;
}
if n > 0 {
wr.write(buf.slice_to(n))
} else {
Ok(())
}
Ok(())
}
fn fmt_number_or_null(v: f64) -> String {