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parse.cljc
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parse.cljc
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; Copyright (c) Alan Thompson. All rights reserved.
; The use and distribution terms for this software are covered by the Eclipse Public
; License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) which can be found in the
; file epl-v10.html at the root of this distribution. By using this software in any
; fashion, you are agreeing to be bound by the terms of this license.
; You must not remove this notice, or any other, from this software.
(ns tupelo.parse
"Utils for parsing string values. Provides a thin Clojure wrapper around java native
parsing functions such as java.lang.Float/parseFloat. Unlike the original java
functions, these native-Clojure functions can be used as higher-order functions in maps,
function arguments, etc. Each function also provides an optional default-value which
will be returned if there is an exception during parsing."
(:require
[clojure.string :as str]
[clojure.tools.reader.edn :as edn]
[clojure.walk :as walk]
[schema.core :as s]
[tupelo.core :as t]
))
; #todo: write doc page
; #todo: convert args from [str-val & opts] -> [str-val & {:as opts} ]
(defn edn-parsible
"Traverses a data structure to ensure it can be serialized with `pr-str` and read via
clojure.tools.reader.edn/read-string. All non-parsible content is replaced
with `::non-parsible-object`. "
[data]
(let [edn-parse-roundtrip (fn [item]
(t/with-exception-default ::edn-non-parsible
(let [item-str (pr-str item)
item-edn (edn/read-string item-str)]
(when-not (= item item-edn)
(throw (ex-info "edn-non-parsible" {:data data})))
item)))
data-unlazy (t/unlazy data) ; coerce to map/vector/string wherever possible
data-parsible (walk/postwalk edn-parse-roundtrip data-unlazy)]
data-parsible))
#?(:clj
(do
(defn parse-byte
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Byte/parseByte. Parses the string str-val into a byte.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Byte/parseByte str-val)
(t/with-exception-default default-val (Byte/parseByte str-val)))))
(defn parse-short
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Short/parseShort. Parses the string str-val into a short.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Short/parseShort str-val)
(t/with-exception-default default-val (Short/parseShort str-val)))))
(defn parse-int
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Integer/parseInt Parses the string str-val into a integer.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Integer/parseInt str-val)
(t/with-exception-default default-val (Integer/parseInt str-val)))))
(defn parse-long
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Long/parseLong. Parses the string str-val into a long.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Long/parseLong str-val)
(t/with-exception-default default-val (Long/parseLong str-val)))))
(defn parse-float
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Float/parseFloat. Parses the string str-val into a float.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Float/parseFloat str-val)
(t/with-exception-default default-val (Float/parseFloat str-val)))))
(defn parse-double
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.Double/parseDouble. Parses the string str-val into a double.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(Double/parseDouble str-val)
(t/with-exception-default default-val (Double/parseDouble str-val)))))
#_(defn parse-xxxx
"( [str-val]
[str-val :default default-val] )
A thin wrapper around java.lang.XXXX/parseXXXX. Parses the string str-val into a xxxx.
If the optional default-val is specified, it will be returned in the event of an
exception."
[str-val & opts]
{:pre [(string? str-val)]}
(let [opts-map (apply hash-map opts)
default-val (get opts-map :default ::none)]
(if (= default-val ::none)
(XXXX/parseXXXX str-val)
(t/with-exception-default default-val (XXXX/parseXXXX str-val)))))
; #awt TODO: finish other parse* functions
))
#?(:cljs
(do
; These regexes are from the internet and aren't guarenteed to be perfect
(def regex-int
"Nominal regex for signed/unsigned integers"
#"^([+-]?[1-9]\d*|0)$")
(def regex-float
"Nominal regex for signed/unsigned floating-point numbers (possibly in scientific notation)"
#"[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?")
(s/defn parse-int :- s/Int ; #todo => tupelo.cljs.parse
"( [str-val]
[str-val :default default-val] )
A thin wrapper around js/parseInt Parses the string str-val into a integer.
If the optional default-val is specified, it will be returned in the event of an
Nan."
([str-val :- s/Str]
(t/cond-it-> (str/trim str-val)
(not (re-matches regex-int it)) (throw (ex-info "parse-int: could not parse input value #1"
(t/vals->map str-val)))
true (js/parseInt it)
(js/isNaN it) (throw (ex-info "parse-int: could not parse input value #2"
(t/vals->map str-val)))))
([str-val default-val]
(t/with-exception-default default-val
(parse-int str-val))))
(s/defn parse-float :- s/Num
"( [str-val]
[str-val :default default-val] )
A thin wrapper around js/parseFloat. Parses the string str-val into a float.
If the optional default-val is specified, it will be returned in the event of an
NaN."
([str-val :- s/Str]
(t/cond-it-> (str/trim str-val)
(not (re-matches regex-float it)) (throw (ex-info "parse-float: could not parse input value #1"
(t/vals->map str-val)))
true (js/parseFloat it)
(js/isNaN it) (throw (ex-info "parse-float: could not parse input value #2"
(t/vals->map str-val)))))
([str-val default-val]
(t/with-exception-default default-val
(parse-float str-val))))
))