Parser and formatter for rewriting foreign code embedded in SQL queries, such as parameter placeholders: `$1` or `:ident`, or code encased in delimiters: `()` `[]` `{}`. It supports the following SQL features: • ” : single quotes. • "" : double quotes. • “ : grave quotes (non-standard). • -- : line comments. • /* : block comments. • :: : Postgres-style cast operator (non-standard). In addition, it supports the following: • () : content in parens. • [] : content in brackets. • {} : content in braces. • $1 $2 ... : ordinal parameter placeholders. • :identifier : named parameter placeholders. Supporting SQL quotes and comments allows us to correctly ignore text inside special delimiters that happens to be part of a string, quoted identifier, or comment. This library supports incremental parsing token by token, via `Tokenizer`. It also lets you convert a sequence of tokens into a fully-built AST via `Parser`. Choose the approach that better suits your use case. Oversimplified example: The AST now looks like this: