66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
// A generic trait to abstract the rewriting of an element (of the AST).
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use std::cell::RefCell;
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use syntax::parse::ParseSess;
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use syntax::ptr;
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use syntax::source_map::{SourceMap, Span};
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use crate::config::{Config, IndentStyle};
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use crate::shape::Shape;
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use crate::visitor::SnippetProvider;
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use crate::FormatReport;
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pub(crate) trait Rewrite {
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/// Rewrite self into shape.
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fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String>;
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}
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impl<T: Rewrite> Rewrite for ptr::P<T> {
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fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
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(**self).rewrite(context, shape)
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}
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}
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#[derive(Clone)]
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pub(crate) struct RewriteContext<'a> {
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pub(crate) parse_session: &'a ParseSess,
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pub(crate) source_map: &'a SourceMap,
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pub(crate) config: &'a Config,
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pub(crate) inside_macro: RefCell<bool>,
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// Force block indent style even if we are using visual indent style.
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pub(crate) use_block: RefCell<bool>,
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// When `is_if_else_block` is true, unindent the comment on top
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// of the `else` or `else if`.
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pub(crate) is_if_else_block: RefCell<bool>,
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// When rewriting chain, veto going multi line except the last element
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pub(crate) force_one_line_chain: RefCell<bool>,
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pub(crate) snippet_provider: &'a SnippetProvider<'a>,
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// Used for `format_snippet`
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pub(crate) macro_rewrite_failure: RefCell<bool>,
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pub(crate) report: FormatReport,
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pub(crate) skip_macro_names: RefCell<Vec<String>>,
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}
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impl<'a> RewriteContext<'a> {
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pub(crate) fn snippet(&self, span: Span) -> &str {
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self.snippet_provider.span_to_snippet(span).unwrap()
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}
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/// Returns `true` if we should use block indent style for rewriting function call.
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pub(crate) fn use_block_indent(&self) -> bool {
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self.config.indent_style() == IndentStyle::Block || *self.use_block.borrow()
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}
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pub(crate) fn budget(&self, used_width: usize) -> usize {
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self.config.max_width().saturating_sub(used_width)
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}
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pub(crate) fn inside_macro(&self) -> bool {
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*self.inside_macro.borrow()
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}
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pub(crate) fn is_if_else_block(&self) -> bool {
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*self.is_if_else_block.borrow()
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}
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}
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