//! Syntax highlighting for format macro strings.
-use syntax::{
- ast::{self, FormatSpecifier, HasFormatSpecifier},
- AstNode, AstToken, SyntaxElement, SyntaxKind, SyntaxNode, TextRange,
+use ide_db::{
+ helpers::format_string::{is_format_string, lex_format_specifiers, FormatSpecifier},
+ SymbolKind,
};
+use syntax::{ast, TextRange};
-use crate::{HighlightedRange, HlTag, SymbolKind};
+use crate::{syntax_highlighting::highlights::Highlights, HlRange, HlTag};
-use super::highlights::Highlights;
-
-#[derive(Default)]
-pub(super) struct FormatStringHighlighter {
- format_string: Option<SyntaxElement>,
-}
-
-impl FormatStringHighlighter {
- pub(super) fn check_for_format_string(&mut self, parent: &SyntaxNode) {
- // Check if macro takes a format string and remember it for highlighting later.
- // The macros that accept a format string expand to a compiler builtin macros
- // `format_args` and `format_args_nl`.
- if let Some(name) = parent
- .parent()
- .and_then(ast::MacroCall::cast)
- .and_then(|mc| mc.path())
- .and_then(|p| p.segment())
- .and_then(|s| s.name_ref())
- {
- match name.text().as_str() {
- "format_args" | "format_args_nl" => {
- self.format_string = parent
- .children_with_tokens()
- .filter(|t| t.kind() != SyntaxKind::WHITESPACE)
- .nth(1)
- .filter(|e| ast::String::can_cast(e.kind()))
- }
- _ => {}
- }
- }
+pub(super) fn highlight_format_string(
+ stack: &mut Highlights,
+ string: &ast::String,
+ expanded_string: &ast::String,
+ range: TextRange,
+) {
+ if !is_format_string(expanded_string) {
+ return;
}
- pub(super) fn highlight_format_string(
- &self,
- stack: &mut Highlights,
- string: &impl HasFormatSpecifier,
- range: TextRange,
- ) {
- if self.format_string.as_ref() == Some(&SyntaxElement::from(string.syntax().clone())) {
- string.lex_format_specifier(|piece_range, kind| {
- if let Some(highlight) = highlight_format_specifier(kind) {
- stack.add(HighlightedRange {
- range: piece_range + range.start(),
- highlight: highlight.into(),
- binding_hash: None,
- });
- }
+
+ lex_format_specifiers(string, &mut |piece_range, kind| {
+ if let Some(highlight) = highlight_format_specifier(kind) {
+ stack.add(HlRange {
+ range: piece_range + range.start(),
+ highlight: highlight.into(),
+ binding_hash: None,
});
}
- }
+ });
}
fn highlight_format_specifier(kind: FormatSpecifier) -> Option<HlTag> {
| FormatSpecifier::Dot
| FormatSpecifier::Asterisk
| FormatSpecifier::QuestionMark => HlTag::FormatSpecifier,
+
FormatSpecifier::Integer | FormatSpecifier::Zero => HlTag::NumericLiteral,
+
FormatSpecifier::Identifier => HlTag::Symbol(SymbolKind::Local),
})
}