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use std::fmt::{Display, Formatter, Result, Write};
use crate::datetime::*;
use crate::document::Document;
use crate::inline_table::DEFAULT_INLINE_KEY_DECOR;
use crate::key::Key;
use crate::repr::{Formatted, Repr, ValueRepr};
use crate::table::{DEFAULT_KEY_DECOR, DEFAULT_KEY_PATH_DECOR, DEFAULT_TABLE_DECOR};
use crate::value::{
DEFAULT_LEADING_VALUE_DECOR, DEFAULT_TRAILING_VALUE_DECOR, DEFAULT_VALUE_DECOR,
};
use crate::{Array, InlineTable, Item, Table, Value};
pub(crate) trait Encode {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result;
}
impl Encode for Key {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
let repr = self.to_repr();
write!(
buf,
"{}{}{}",
self.decor().prefix().unwrap_or(default_decor.0),
repr,
self.decor().suffix().unwrap_or(default_decor.1)
)
}
}
impl<'k> Encode for &'k [&'k Key] {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
for (i, key) in self.iter().enumerate() {
let first = i == 0;
let last = i + 1 == self.len();
let prefix = if first {
default_decor.0
} else {
DEFAULT_KEY_PATH_DECOR.0
};
let suffix = if last {
default_decor.1
} else {
DEFAULT_KEY_PATH_DECOR.1
};
if !first {
write!(buf, ".")?;
}
key.encode(buf, (prefix, suffix))?;
}
Ok(())
}
}
impl<T> Encode for Formatted<T>
where
T: ValueRepr,
{
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
let repr = self.to_repr();
write!(
buf,
"{}{}{}",
self.decor().prefix().unwrap_or(default_decor.0),
repr,
self.decor().suffix().unwrap_or(default_decor.1)
)
}
}
impl Encode for Array {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
write!(buf, "{}[", self.decor().prefix().unwrap_or(default_decor.0))?;
for (i, elem) in self.iter().enumerate() {
let inner_decor;
if i == 0 {
inner_decor = DEFAULT_LEADING_VALUE_DECOR;
} else {
inner_decor = DEFAULT_VALUE_DECOR;
write!(buf, ",")?;
}
elem.encode(buf, inner_decor)?;
}
if self.trailing_comma() && !self.is_empty() {
write!(buf, ",")?;
}
write!(buf, "{}", self.trailing())?;
write!(buf, "]{}", self.decor().suffix().unwrap_or(default_decor.1))
}
}
impl Encode for InlineTable {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
write!(
buf,
"{}{{",
self.decor().prefix().unwrap_or(default_decor.0)
)?;
write!(buf, "{}", self.preamble)?;
let children = self.get_values();
let len = children.len();
for (i, (key_path, value)) in children.into_iter().enumerate() {
if i != 0 {
write!(buf, ",")?;
}
let inner_decor = if i == len - 1 {
DEFAULT_TRAILING_VALUE_DECOR
} else {
DEFAULT_VALUE_DECOR
};
key_path.as_slice().encode(buf, DEFAULT_INLINE_KEY_DECOR)?;
write!(buf, "=")?;
value.encode(buf, inner_decor)?;
}
write!(
buf,
"}}{}",
self.decor().suffix().unwrap_or(default_decor.1)
)
}
}
impl Encode for Value {
fn encode(&self, buf: &mut dyn Write, default_decor: (&str, &str)) -> Result {
match self {
Value::String(repr) => repr.encode(buf, default_decor),
Value::Integer(repr) => repr.encode(buf, default_decor),
Value::Float(repr) => repr.encode(buf, default_decor),
Value::Boolean(repr) => repr.encode(buf, default_decor),
Value::Datetime(repr) => repr.encode(buf, default_decor),
Value::Array(array) => array.encode(buf, default_decor),
Value::InlineTable(table) => table.encode(buf, default_decor),
}
}
}
impl Display for Document {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
let mut path = Vec::new();
let mut last_position = 0;
let mut tables = Vec::new();
visit_nested_tables(self.as_table(), &mut path, false, &mut |t, p, is_array| {
if let Some(pos) = t.position() {
last_position = pos;
}
tables.push((last_position, t, p.clone(), is_array));
Ok(())
})
.unwrap();
tables.sort_by_key(|&(id, _, _, _)| id);
for (_, table, path, is_array) in tables {
visit_table(f, table, &path, is_array)?;
}
self.trailing.fmt(f)
}
}
fn visit_nested_tables<'t, F>(
table: &'t Table,
path: &mut Vec<&'t Key>,
is_array_of_tables: bool,
callback: &mut F,
) -> Result
where
F: FnMut(&'t Table, &Vec<&'t Key>, bool) -> Result,
{
callback(table, path, is_array_of_tables)?;
for kv in table.items.values() {
match kv.value {
Item::Table(ref t) if !t.is_dotted() => {
path.push(&kv.key);
visit_nested_tables(t, path, false, callback)?;
path.pop();
}
Item::ArrayOfTables(ref a) => {
for t in a.iter() {
path.push(&kv.key);
visit_nested_tables(t, path, true, callback)?;
path.pop();
}
}
_ => {}
}
}
Ok(())
}
fn visit_table(
buf: &mut dyn Write,
table: &Table,
path: &[&Key],
is_array_of_tables: bool,
) -> Result {
let children = table.get_values();
let is_visible_std_table = !(table.implicit && children.is_empty());
if path.is_empty() {
} else if is_array_of_tables {
write!(
buf,
"{}[[",
table.decor.prefix().unwrap_or(DEFAULT_TABLE_DECOR.0)
)?;
path.encode(buf, DEFAULT_KEY_PATH_DECOR)?;
writeln!(
buf,
"]]{}",
table.decor.suffix().unwrap_or(DEFAULT_TABLE_DECOR.1)
)?;
} else if is_visible_std_table {
write!(
buf,
"{}[",
table.decor.prefix().unwrap_or(DEFAULT_TABLE_DECOR.0)
)?;
path.encode(buf, DEFAULT_KEY_PATH_DECOR)?;
writeln!(
buf,
"]{}",
table.decor.suffix().unwrap_or(DEFAULT_TABLE_DECOR.1)
)?;
}
for (key_path, value) in children {
key_path.as_slice().encode(buf, DEFAULT_KEY_DECOR)?;
write!(buf, "=")?;
value.encode(buf, DEFAULT_VALUE_DECOR)?;
writeln!(buf)?;
}
Ok(())
}
impl ValueRepr for String {
fn to_repr(&self) -> Repr {
to_string_repr(self, None, None)
}
}
pub(crate) fn to_string_repr(
value: &str,
style: Option<StringStyle>,
literal: Option<bool>,
) -> Repr {
let (style, literal) = match (style, literal) {
(Some(style), Some(literal)) => (style, literal),
(_, Some(literal)) => (infer_style(value).0, literal),
(Some(style), _) => (style, infer_style(value).1),
(_, _) => infer_style(value),
};
let mut output = String::with_capacity(value.len() * 2);
if literal {
output.push_str(style.literal_start());
output.push_str(value);
output.push_str(style.literal_end());
} else {
output.push_str(style.standard_start());
for ch in value.chars() {
match ch {
'\u{8}' => output.push_str("\\b"),
'\u{9}' => output.push_str("\\t"),
'\u{a}' => match style {
StringStyle::NewlineTripple => output.push('\n'),
StringStyle::OnelineSingle => output.push_str("\\n"),
_ => unreachable!(),
},
'\u{c}' => output.push_str("\\f"),
'\u{d}' => output.push_str("\\r"),
'\u{22}' => output.push_str("\\\""),
'\u{5c}' => output.push_str("\\\\"),
c if c <= '\u{1f}' || c == '\u{7f}' => {
write!(output, "\\u{:04X}", ch as u32).unwrap();
}
ch => output.push(ch),
}
}
output.push_str(style.standard_end());
}
Repr::new_unchecked(output)
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub(crate) enum StringStyle {
NewlineTripple,
OnelineTripple,
OnelineSingle,
}
impl StringStyle {
fn literal_start(self) -> &'static str {
match self {
Self::NewlineTripple => "'''\n",
Self::OnelineTripple => "'''",
Self::OnelineSingle => "'",
}
}
fn literal_end(self) -> &'static str {
match self {
Self::NewlineTripple => "'''",
Self::OnelineTripple => "'''",
Self::OnelineSingle => "'",
}
}
fn standard_start(self) -> &'static str {
match self {
Self::NewlineTripple => "\"\"\"\n",
Self::OnelineTripple | Self::OnelineSingle => "\"",
}
}
fn standard_end(self) -> &'static str {
match self {
Self::NewlineTripple => "\"\"\"",
Self::OnelineTripple | Self::OnelineSingle => "\"",
}
}
}
fn infer_style(value: &str) -> (StringStyle, bool) {
let mut out = String::with_capacity(value.len() * 2);
let mut ty = StringStyle::OnelineSingle;
let mut max_found_singles = 0;
let mut found_singles = 0;
let mut prefer_literal = false;
let mut can_be_pretty = true;
for ch in value.chars() {
if can_be_pretty {
if ch == '\'' {
found_singles += 1;
if found_singles >= 3 {
can_be_pretty = false;
}
} else {
if found_singles > max_found_singles {
max_found_singles = found_singles;
}
found_singles = 0
}
match ch {
'\t' => {}
'\\' => {
prefer_literal = true;
}
'\n' => ty = StringStyle::NewlineTripple,
c if c <= '\u{1f}' || c == '\u{7f}' => can_be_pretty = false,
_ => {}
}
out.push(ch);
} else {
if ch == '\n' {
ty = StringStyle::NewlineTripple;
}
}
}
if found_singles > 0 && value.ends_with('\'') {
can_be_pretty = false;
}
if !prefer_literal {
can_be_pretty = false;
}
if !can_be_pretty {
debug_assert!(ty != StringStyle::OnelineTripple);
return (ty, false);
}
if found_singles > max_found_singles {
max_found_singles = found_singles;
}
debug_assert!(max_found_singles < 3);
if ty == StringStyle::OnelineSingle && max_found_singles >= 1 {
ty = StringStyle::OnelineTripple;
}
(ty, true)
}
impl ValueRepr for i64 {
fn to_repr(&self) -> Repr {
Repr::new_unchecked(self.to_string())
}
}
impl ValueRepr for f64 {
fn to_repr(&self) -> Repr {
to_f64_repr(*self)
}
}
fn to_f64_repr(f: f64) -> Repr {
let repr = match (f.is_sign_negative(), f.is_nan(), f == 0.0) {
(true, true, _) => "-nan".to_owned(),
(false, true, _) => "nan".to_owned(),
(true, false, true) => "-0.0".to_owned(),
(false, false, true) => "0.0".to_owned(),
(_, false, false) => {
if f % 1.0 == 0.0 {
format!("{}.0", f)
} else {
format!("{}", f)
}
}
};
Repr::new_unchecked(repr)
}
impl ValueRepr for bool {
fn to_repr(&self) -> Repr {
Repr::new_unchecked(self.to_string())
}
}
impl ValueRepr for Datetime {
fn to_repr(&self) -> Repr {
Repr::new_unchecked(self.to_string())
}
}