parse-string

Parses first EDN value from string. Supported parsing options can be `true` for default behavior or a function that is called on the form and returns a form in its place: `:deref`: parse forms starting with `@`. If `true`, the resulting expression will be parsed as `(deref expr)`. `:fn`: parse function literals (`#(inc %)`). If `true`, will be parsed as `(fn [%1] (inc %))`. `:quote`: parse quoted expression `'foo`. If `true`, will be parsed as `(quote foo)`. `:read-eval`: parse read-eval (`#=(+ 1 2 3)`). If `true`, the resulting expression will be parsed as `(read-eval (+ 1 2 3))`. `:regex`: parse regex literals (`#"foo"`). If `true`, defaults to `re-pattern`. `:var`: parse var literals (`#'foo`). If `true`, the resulting expression will be parsed as `(var foo)`. `:map`: parse map literal using a custom function, e.g. `flatland.ordered.map/ordered-map` `:set`: parse set literal using a custom function, e.g. `flatland.ordered.set/ordered-set` `:syntax-quote`: parse syntax-quote (`(+ 1 2 3)`). Symbols get qualified using `:resolve-symbol` which defaults to `identity`: ```clojure (parse-string "`x" {:syntax-quote {:resolve-symbol #(symbol "user" (str %))}}) ;;=> (quote user/x) ``` By default, also parses `unquote` and `unquote-splicing` literals, resolving them accordingly. `:unquote`: parse unquote (`~x`). Requires `:syntax-quote` to be set. If `true` and not inside `syntax-quote`, defaults to `clojure.core/unquote`. `:unquote-splicing`: parse unquote-splicing (`~@x`). Requires `:syntax-quote` to be set. If `true` and not inside `syntax-quote`, defaults to `clojure.core/unquote-splicing`. `:all`: when `true`, the above options will be set to `true` unless explicitly provided. Supported options for processing reader conditionals: `:read-cond`: - `:allow` to process reader conditionals, or `:preserve` to keep all branches `:features`: - persistent set of feature keywords for reader conditionals (e.g. `#{:clj}`). `:auto-resolve`: map of alias to namespace symbols for auto-resolving keywords. Use `:current` as the alias for the current namespace. `:readers`: data readers. `:postprocess`: a function that is called with a map containing `:obj`, the read value, and `:loc`, the location metadata. This can be used to handle objects that cannot carry metadata differently. If this option is provided, attaching location metadata is not automatically added to the object. `:location?`: a predicate that is called with the parsed object. Should return a truthy value to determine if location information will be added. `:uneval`: a function of a map with `:uneval` and `:next` to preserve `#_` expressions by combining them with next value. `:suppress-read`: counterpart to *suppress-read* in clojure Additional arguments to tools.reader may be passed with `:tools.reader/opts`, like `:readers` for passing reader tag functions.