359 lines
10 KiB
Rust
359 lines
10 KiB
Rust
use crate::hex::HexFormatter;
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use crate::value::DomainEncode;
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use crate::value::IOValue;
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use crate::value::IOValueDomainCodec;
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use crate::value::NestedValue;
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use crate::value::Writer;
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use crate::value::suspendable::Suspendable;
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use crate::value::writer::CompoundWriter;
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use lazy_static::lazy_static;
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use num::bigint::BigInt;
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use std::io;
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use super::super::boundary as B;
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#[derive(Clone, Copy, Debug)]
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pub enum CommaStyle {
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None,
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Separating,
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Terminating,
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}
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pub struct TextWriter<W: io::Write> {
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w: Suspendable<W>,
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pub comma_style: CommaStyle,
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pub indentation: usize,
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pub escape_spaces: bool,
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indent: String,
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}
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impl std::default::Default for CommaStyle {
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fn default() -> Self {
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CommaStyle::Separating
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}
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}
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impl TextWriter<&mut Vec<u8>> {
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pub fn fmt_value<N: NestedValue, Enc: DomainEncode<N::Embedded>>(
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f: &mut std::fmt::Formatter<'_>,
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enc: &mut Enc,
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v: &crate::value::Value<N>,
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) -> io::Result<()> {
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let mut buf: Vec<u8> = Vec::new();
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let mut w = TextWriter::new(&mut buf);
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if f.alternate() { w.indentation = 4 }
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w.write_value(enc, v)?;
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f.write_str(std::str::from_utf8(&buf).expect("valid UTF-8 from TextWriter")).map_err(
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|_| io::Error::new(io::ErrorKind::Other, "could not append to Formatter"))
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}
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pub fn encode<N: NestedValue, Enc: DomainEncode<N::Embedded>>(
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enc: &mut Enc,
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v: &N,
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) -> io::Result<String> {
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let mut buf: Vec<u8> = Vec::new();
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TextWriter::new(&mut buf).write(enc, v)?;
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Ok(String::from_utf8(buf).expect("valid UTF-8 from TextWriter"))
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}
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pub fn encode_iovalue(v: &IOValue) -> io::Result<String> {
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Self::encode(&mut IOValueDomainCodec, v)
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}
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}
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impl<W: io::Write> TextWriter<W> {
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pub fn new(w: W) -> Self {
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TextWriter {
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w: Suspendable::new(w),
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comma_style: CommaStyle::default(),
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indentation: 0,
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escape_spaces: false,
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indent: "\n".to_owned(),
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}
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}
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pub fn set_comma_style(mut self, v: CommaStyle) -> Self {
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self.comma_style = v;
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self
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}
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pub fn set_escape_spaces(mut self, v: bool) -> Self {
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self.escape_spaces = v;
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self
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}
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pub fn suspend(&mut self) -> Self {
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TextWriter { w: self.w.suspend(), indent: self.indent.clone(), .. *self }
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}
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pub fn resume(&mut self, other: Self) {
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self.w.resume(other.w)
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}
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pub fn write_stringlike_char_fallback<F>(
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&mut self,
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c: char,
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f: F,
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) -> io::Result<()> where
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F: FnOnce(&mut W, char) -> io::Result<()>
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{
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match c {
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'\\' => write!(self.w, "\\\\"),
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'\x08' => write!(self.w, "\\b"),
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'\x0c' => write!(self.w, "\\f"),
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'\x0a' => write!(self.w, "\\n"),
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'\x0d' => write!(self.w, "\\r"),
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'\x09' => write!(self.w, "\\t"),
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_ => f(&mut self.w, c),
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}
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}
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pub fn write_stringlike_char(&mut self, c: char) -> io::Result<()> {
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self.write_stringlike_char_fallback(c, |w, c| write!(w, "{}", c))
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}
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pub fn add_indent(&mut self) {
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for _ in 0 .. self.indentation {
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self.indent.push(' ')
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}
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}
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pub fn del_indent(&mut self) {
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if self.indentation > 0 {
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self.indent.truncate(self.indent.len() - self.indentation)
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}
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}
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pub fn indent(&mut self) -> io::Result<()> {
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if self.indentation > 0 {
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write!(self.w, "{}", &self.indent)
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} else {
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Ok(())
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}
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}
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pub fn indent_sp(&mut self) -> io::Result<()> {
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if self.indentation > 0 {
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write!(self.w, "{}", &self.indent)
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} else {
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write!(self.w, " ")
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}
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}
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pub fn borrow_write(&mut self) -> &mut W {
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&mut self.w
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}
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}
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impl<W: io::Write> CompoundWriter for TextWriter<W> {
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#[inline]
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fn boundary(&mut self, b: &B::Type) -> io::Result<()> {
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match (b.closing.as_ref(), b.opening.as_ref()) {
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(None, Some(B::Item::RecordLabel)) |
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(Some(B::Item::RecordLabel), None) |
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(Some(B::Item::RecordField), None) =>
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return Ok(()),
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(_, Some(B::Item::RecordField)) =>
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return write!(self.w, " "),
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(Some(B::Item::DictionaryKey), Some(B::Item::DictionaryValue)) => {
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return write!(self.w, ": ")
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}
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(None, Some(B::Item::Annotation)) => {
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return write!(self.w, "@")
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}
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(Some(_), Some(B::Item::Annotation)) => {
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return write!(self.w, " @")
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}
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(Some(B::Item::Annotation), Some(B::Item::AnnotatedValue)) => {
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return write!(self.w, " ")
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}
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(Some(B::Item::AnnotatedValue), None) =>
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return Ok(()),
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_ => (),
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}
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match (b.closing.as_ref(), b.opening.as_ref()) {
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(None, None) => (),
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(None, Some(_)) => {
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self.add_indent();
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self.indent()?
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},
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(Some(_), Some(_)) => {
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match self.comma_style {
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CommaStyle::Separating | CommaStyle::Terminating => write!(self.w, ",")?,
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CommaStyle::None => (),
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}
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self.indent_sp()?
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}
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(Some(_), None) => {
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match self.comma_style {
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CommaStyle::Terminating => write!(self.w, ",")?,
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CommaStyle::Separating | CommaStyle::None => (),
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}
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self.del_indent();
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self.indent()?
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}
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}
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Ok(())
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}
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}
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macro_rules! simple_writer_method {
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($n:ident, $argty:ty) =>
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(fn $n (&mut self, v: $argty) -> io::Result<()> {
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write!(self.w, "{}", v)
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});
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}
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impl<W: io::Write> Writer for TextWriter<W> {
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type AnnWriter = Self;
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type RecWriter = Self;
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type SeqWriter = Self;
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type SetWriter = Self;
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type DictWriter = Self;
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type EmbeddedWriter = Self;
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fn start_annotations(&mut self) -> io::Result<Self::AnnWriter> {
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Ok(self.suspend())
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}
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fn end_annotations(&mut self, ann: Self::AnnWriter) -> io::Result<()> {
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self.resume(ann);
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Ok(())
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}
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fn write_bool(&mut self, v: bool) -> io::Result<()> {
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write!(self.w, "{}", if v { "#t" } else { "#f" })
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}
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fn write_f32(&mut self, v: f32) -> io::Result<()> {
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if v.is_nan() || v.is_infinite() {
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write!(self.w, "#xf\"{}\"",
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HexFormatter::Packed.encode(&u32::to_be_bytes(f32::to_bits(v))))
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} else {
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dtoa::write(&mut *self.w, v)?;
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write!(self.w, "f")
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}
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}
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fn write_f64(&mut self, v: f64) -> io::Result<()> {
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if v.is_nan() || v.is_infinite() {
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write!(self.w, "#xd\"{}\"",
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HexFormatter::Packed.encode(&u64::to_be_bytes(f64::to_bits(v))))
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} else {
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dtoa::write(&mut *self.w, v)?;
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Ok(())
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}
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}
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simple_writer_method!(write_i8, i8);
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simple_writer_method!(write_u8, u8);
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simple_writer_method!(write_i16, i16);
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simple_writer_method!(write_u16, u16);
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simple_writer_method!(write_i32, i32);
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simple_writer_method!(write_u32, u32);
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simple_writer_method!(write_i64, i64);
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simple_writer_method!(write_u64, u64);
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simple_writer_method!(write_i128, i128);
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simple_writer_method!(write_u128, u128);
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simple_writer_method!(write_int, &BigInt);
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fn write_string(&mut self, v: &str) -> io::Result<()> {
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write!(self.w, "\"")?;
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for c in v.chars() {
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match c {
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'"' => write!(self.w, "\\\"")?,
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' ' if self.escape_spaces => write!(self.w, "\\u0020")?,
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_ => self.write_stringlike_char(c)?,
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}
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}
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write!(self.w, "\"")
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}
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fn write_bytes(&mut self, v: &[u8]) -> io::Result<()> {
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write!(self.w, "#[{}]", base64::encode_config(v, base64::STANDARD_NO_PAD))
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}
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fn write_symbol(&mut self, v: &str) -> io::Result<()> {
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lazy_static! {
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// FIXME: This regular expression is conservatively correct, but Anglo-chauvinistic.
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static ref RE: regex::Regex =
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regex::Regex::new("^[-a-zA-Z0-9~!$%^&*?_=+/.]+$").unwrap();
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}
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if RE.is_match(v) {
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write!(self.w, "{}", v)
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} else {
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write!(self.w, "|")?;
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for c in v.chars() {
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match c {
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'|' => write!(self.w, "\\|")?,
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' ' if self.escape_spaces => write!(self.w, "\\u0020")?,
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_ => self.write_stringlike_char(c)?,
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}
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}
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write!(self.w, "|")
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}
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}
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fn start_record(&mut self, _field_count: Option<usize>) -> io::Result<Self::RecWriter> {
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write!(self.w, "<")?;
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Ok(self.suspend())
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}
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fn end_record(&mut self, rec: Self::RecWriter) -> io::Result<()> {
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self.resume(rec);
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write!(self.w, ">")
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}
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fn start_sequence(&mut self, _item_count: Option<usize>) -> io::Result<Self::SeqWriter> {
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write!(self.w, "[")?;
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Ok(self.suspend())
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}
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fn end_sequence(&mut self, seq: Self::SeqWriter) -> io::Result<()> {
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self.resume(seq);
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write!(self.w, "]")
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}
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fn start_set(&mut self, _item_count: Option<usize>) -> io::Result<Self::SetWriter> {
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write!(self.w, "#{{")?;
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Ok(self.suspend())
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}
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fn end_set(&mut self, set: Self::SetWriter) -> io::Result<()> {
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self.resume(set);
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write!(self.w, "}}")
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}
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fn start_dictionary(&mut self, _entry_count: Option<usize>) -> io::Result<Self::DictWriter> {
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write!(self.w, "{{")?;
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Ok(self.suspend())
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}
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fn end_dictionary(&mut self, dict: Self::DictWriter) -> io::Result<()> {
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self.resume(dict);
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write!(self.w, "}}")
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}
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fn start_embedded(&mut self) -> io::Result<Self::EmbeddedWriter> {
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write!(self.w, "#!")?;
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Ok(self.suspend())
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}
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fn end_embedded(&mut self, ptr: Self::EmbeddedWriter) -> io::Result<()> {
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self.resume(ptr);
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Ok(())
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}
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fn flush(&mut self) -> io::Result<()> {
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self.w.flush()
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}
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}
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