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use crate::{
config::{items::ItemBraceStyle, user_def::FieldAlignment},
formatter::{
shape::{ExprKind, LineStyle},
*,
},
utils::{
map::byte_span::{ByteSpan, LeafSpans},
CurlyBrace,
},
};
use std::fmt::Write;
use sway_ast::{
token::{Delimiter, PunctKind},
ItemEnum,
};
use sway_types::Spanned;
#[cfg(test)]
mod tests;
impl Format for ItemEnum {
fn format(
&self,
formatted_code: &mut FormattedCode,
formatter: &mut Formatter,
) -> Result<(), FormatterError> {
formatter.with_shape(
formatter
.shape
.with_code_line_from(LineStyle::Multiline, ExprKind::default()),
|formatter| -> Result<(), FormatterError> {
// If there is a visibility token add it to the formatted_code with a ` ` after it.
if let Some(visibility) = &self.visibility {
write!(formatted_code, "{} ", visibility.span().as_str())?;
}
// Add enum token and name
write!(formatted_code, "{} ", self.enum_token.span().as_str())?;
self.name.format(formatted_code, formatter)?;
// Format `GenericParams`, if any
if let Some(generics) = &self.generics {
generics.format(formatted_code, formatter)?;
}
let fields = self.fields.get();
// Handle openning brace
Self::open_curly_brace(formatted_code, formatter)?;
// Determine alignment tactic
match formatter.config.structures.field_alignment {
FieldAlignment::AlignFields(enum_variant_align_threshold) => {
writeln!(formatted_code)?;
let value_pairs = &fields
.value_separator_pairs
.iter()
// TODO: Handle annotations instead of stripping them
.map(|pair| (&pair.0.value, &pair.1))
.collect::<Vec<_>>();
// In first iteration we are going to be collecting the lengths of the enum variants.
let variant_length: Vec<usize> = value_pairs
.iter()
.map(|(type_field, _)| type_field.name.as_str().len())
.collect();
// Find the maximum length in the variant_length vector that is still smaller than enum_field_align_threshold.
let mut max_valid_variant_length = 0;
variant_length.iter().for_each(|length| {
if *length > max_valid_variant_length
&& *length < enum_variant_align_threshold
{
max_valid_variant_length = *length;
}
});
let value_pairs_iter = value_pairs.iter().enumerate();
for (var_index, (type_field, comma_token)) in value_pairs_iter.clone() {
write!(
formatted_code,
"{}",
&formatter.shape.indent.to_string(&formatter.config)?
)?;
// Add name
type_field.name.format(formatted_code, formatter)?;
let current_variant_length = variant_length[var_index];
if current_variant_length < max_valid_variant_length {
// We need to add alignment between : and ty
// max_valid_variant_length: the length of the variant that we are taking as a reference to align
// current_variant_length: the length of the current variant that we are trying to format
let mut required_alignment =
max_valid_variant_length - current_variant_length;
while required_alignment != 0 {
write!(formatted_code, " ")?;
required_alignment -= 1;
}
}
// Add `:`, ty & `CommaToken`
write!(
formatted_code,
" {} ",
type_field.colon_token.span().as_str(),
)?;
type_field.ty.format(formatted_code, formatter)?;
writeln!(formatted_code, "{}", comma_token.span().as_str())?;
}
if let Some(final_value) = &fields.final_value_opt {
// TODO: Handle annotation
let final_value = &final_value.value;
writeln!(
formatted_code,
"{}{}",
final_value.span().as_str(),
PunctKind::Comma.as_char(),
)?;
}
}
FieldAlignment::Off => fields.format(formatted_code, formatter)?,
}
// Handle closing brace
Self::close_curly_brace(formatted_code, formatter)?;
Ok(())
},
)?;
Ok(())
}
}
impl CurlyBrace for ItemEnum {
fn open_curly_brace(
line: &mut String,
formatter: &mut Formatter,
) -> Result<(), FormatterError> {
let brace_style = formatter.config.items.item_brace_style;
let open_brace = Delimiter::Brace.as_open_char();
match brace_style {
ItemBraceStyle::AlwaysNextLine => {
// Add openning brace to the next line.
writeln!(line, "\n{}", open_brace)?;
formatter.shape.block_indent(&formatter.config);
}
_ => {
// Add opening brace to the same line
write!(line, " {}", open_brace)?;
formatter.shape.block_indent(&formatter.config);
}
}
Ok(())
}
fn close_curly_brace(
line: &mut String,
formatter: &mut Formatter,
) -> Result<(), FormatterError> {
// If shape is becoming left-most aligned or - indent just have the defualt shape
formatter.shape.block_unindent(&formatter.config);
write!(
line,
"{}{}",
formatter.shape.indent.to_string(&formatter.config)?,
Delimiter::Brace.as_close_char()
)?;
Ok(())
}
}
impl LeafSpans for ItemEnum {
fn leaf_spans(&self) -> Vec<ByteSpan> {
let mut collected_spans = Vec::new();
if let Some(visibility) = &self.visibility {
collected_spans.push(ByteSpan::from(visibility.span()));
}
collected_spans.push(ByteSpan::from(self.enum_token.span()));
collected_spans.push(ByteSpan::from(self.name.span()));
if let Some(generics) = &self.generics {
collected_spans.push(ByteSpan::from(generics.parameters.span()))
}
collected_spans.append(&mut self.fields.leaf_spans());
collected_spans
}
}