Method parse_primitive

regex/regex-syntax/src/ast/parse.rs:1399–1433

Parse a primitive AST. e.g., A literal, non-set character class or assertion. This assumes that the parser expects a primitive at the current location. i.e., All other non-primitive cases have been handled. For example, if the parser's position is at `|`, then `|` will be treated as a literal (e.g., inside a character class). This advances the parser to the first character immediately following

(&self)

    /// This advances the parser to the first character immediately following
    /// the primitive.
    fn parse_primitive(&self) -> Result<Primitive> {
        match self.char() {
            '\\' => self.parse_escape(),
            '.' => {
                let ast = Primitive::Dot(self.span_char());
                self.bump();
                Ok(ast)
            }
            '^' => {
                let ast = Primitive::Assertion(ast::Assertion {
                    span: self.span_char(),
                    kind: ast::AssertionKind::StartLine,
                });
                self.bump();
                Ok(ast)
            }
            '$' => {
                let ast = Primitive::Assertion(ast::Assertion {
                    span: self.span_char(),
                    kind: ast::AssertionKind::EndLine,
                });
                self.bump();
                Ok(ast)
            }
            c => {
                let ast = Primitive::Literal(ast::Literal {
                    span: self.span_char(),
                    kind: ast::LiteralKind::Verbatim,
                    c: c,
                });
                self.bump();
                Ok(ast)
            }
        }
    }

    /// Parse an escape sequence as a primitive AST.
    ///