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selectors.cljc
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(ns garden.selectors
"Macros and functions for working with CSS selectors."
(:require
[clojure.string :as string])
#?(:clj
(:refer-clojure :exclude [+ - > empty first map meta not time var]))
#?(:clj
(:import clojure.lang.Keyword
clojure.lang.Symbol
clojure.lang.IFn
clojure.lang.Named))
#?(:cljs
(:refer-clojure :exclude [+ - > empty first map meta not time]))
#?(:cljs
(:require-macros
[garden.selectors :refer [defselector
defid
defpseudoclass
defpseudoelement
gen-type-selector-defs
gen-pseudo-class-defs]])))
(defprotocol ICSSSelector
(css-selector [this]))
(defn selector? [x]
(satisfies? ICSSSelector x))
(extend-protocol ICSSSelector
#?(:clj String
:cljs string)
(css-selector [this] this)
Keyword
(css-selector [this]
(name this))
Symbol
(css-selector [this]
(name this)))
#?(:clj
(defrecord CSSSelector [selector]
ICSSSelector
(css-selector [this]
(css-selector (:selector this)))
IFn
(invoke [this]
this)
(invoke [this a]
(CSSSelector. (str (css-selector this)
(css-selector a))))
(invoke [this a b]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b))))
(invoke [this a b c]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c))))
(invoke [this a b c d]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d))))
(invoke [this a b c d e]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e))))
(invoke [this a b c d e f]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f))))
(invoke [this a b c d e f g]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g))))
(invoke [this a b c d e f g h]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h))))
(invoke [this a b c d e f g h i]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i))))
(invoke [this a b c d e f g h i j]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j))))
(invoke [this a b c d e f g h i j k]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k))))
(invoke [this a b c d e f g h i j k l]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l))))
(invoke [this a b c d e f g h i j k l m]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m))))
(invoke [this a b c d e f g h i j k l m n]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n))))
(invoke [this a b c d e f g h i j k l m n o]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o))))
(invoke [this a b c d e f g h i j k l m n o p]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p))))
(invoke [this a b c d e f g h i j k l m n o p q]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q))))
(invoke [this a b c d e f g h i j k l m n o p q r]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r))))
(invoke [this a b c d e f g h i j k l m n o p q r s]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r)
(css-selector s))))
(invoke [this a b c d e f g h i j k l m n o p q r s t]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r)
(css-selector s)
(css-selector t))))
(applyTo [this args]
(clojure.lang.AFn/applyToHelper this args))))
#?(:cljs
(defrecord CSSSelector [selector]
ICSSSelector
(css-selector [this]
(css-selector (:selector this)))
IFn
(-invoke [this]
this)
(-invoke [this a]
(CSSSelector. (str (css-selector this)
(css-selector a))))
(-invoke [this a b]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b))))
(-invoke [this a b c]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c))))
(-invoke [this a b c d]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d))))
(-invoke [this a b c d e]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e))))
(-invoke [this a b c d e f]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f))))
(-invoke [this a b c d e f g]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g))))
(-invoke [this a b c d e f g h]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h))))
(-invoke [this a b c d e f g h i]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i))))
(-invoke [this a b c d e f g h i j]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j))))
(-invoke [this a b c d e f g h i j k]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k))))
(-invoke [this a b c d e f g h i j k l]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l))))
(-invoke [this a b c d e f g h i j k l m]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m))))
(-invoke [this a b c d e f g h i j k l m n]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n))))
(-invoke [this a b c d e f g h i j k l m n o]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o))))
(-invoke [this a b c d e f g h i j k l m n o p]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p))))
(-invoke [this a b c d e f g h i j k l m n o p q]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q))))
(-invoke [this a b c d e f g h i j k l m n o p q r]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r))))
(-invoke [this a b c d e f g h i j k l m n o p q r s]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r)
(css-selector s))))
(-invoke [this a b c d e f g h i j k l m n o p q r s t]
(CSSSelector. (str (css-selector this)
(css-selector a)
(css-selector b)
(css-selector c)
(css-selector d)
(css-selector e)
(css-selector f)
(css-selector g)
(css-selector h)
(css-selector i)
(css-selector j)
(css-selector k)
(css-selector l)
(css-selector m)
(css-selector n)
(css-selector o)
(css-selector p)
(css-selector q)
(css-selector r)
(css-selector s)
(css-selector t))))))
(defn selector [x]
(CSSSelector. x))
;; ---------------------------------------------------------------------
;; Macros
#?(:clj
(defmacro defselector
"Define an instance of a CSSSelector named sym for creating a
CSS selector. This instance doubles as both a function and a
literal (when passed to the css-selector). When the function is called
it will return a new instance that possesses the same properties. All
arguments to the function must satisfy ICSSSelector.
Example:
(defselector a)
;; => #'user/a
(a \":hover\")
;; => #<CSSSelector garden.selectors.CSSSelector@7c42c2a9>
(css-selector a)
;; => \"a\"
(css-selector (a \":hover\"))
;; => \"a:hover\"
"
([sym]
`(defselector ~sym ~(name sym)))
([sym strval]
{:pre [(string? strval)]}
(let [[_ sym v] (macroexpand `(def ~sym (selector ~strval)))
sym (vary-meta sym assoc :arglists `'([~'& ~'selectors]))]
`(def ~sym ~v)))))
#?(:clj
(defmacro defclass [sym]
`(defselector ~sym ~(str "." (name sym)))))
#?(:clj
(defmacro defid [sym]
`(defselector ~sym ~(str "#" (name sym)))))
#?(:clj
(defmacro defpseudoclass
"Define an instance of a CSSSelector named sym for creating a CSS
pseudo class. This instance doubles as both a function and a
literal (when passed to the css-selector). When the function is called
it will return a new instance that possesses the same properties. All
arguments to the function must satisfy ICSSSelector.
Optionally fn-tail may be passed to create a structual pseudo class.
The return value of the function constructed from fn-tail will be
cast to a string via css-selector or str.
Example:
(defselector a)
;; => #'user/a
(defpseudoclass hover)
;; => #'user/hover
(hover)
;; => #<CssSelector garden.selectors.CssSelector@2a0ca6e1>
(p/selector (a hover))
;; => \"a:hover\"
Example:
(defpseudoclass not [x]
(p/selector x))
;; => #'user/not
(p/selector (a hover (not \"span\"))
;; => a:hover:not(span)
;; Where p/selector is garden.protocols/selector
"
[sym & fn-tail]
(if (seq fn-tail)
(let [fn1 (macroexpand `(fn ~fn-tail))
arglists (clojure.core/map clojure.core/first (rest fn1))
[_ sym fn2] (macroexpand
`(defn ~sym [& args#]
(let [v# (apply ~fn1 args#)
v# (if (selector? v#)
(css-selector v#)
v#)]
(selector (str \: ~(name sym) "(" v# ")")))))
sym (vary-meta sym assoc :arglists `'~arglists)]
`(def ~sym ~fn2))
`(defselector ~sym ~(str \: (name sym))))))
#?(:clj
(defmacro defpseudoelement
"Define an instance of a CSSSelector named sym for creating a CSS
pseudo element. This instance doubles as both a function and a
literal (when passed to the css-selector). When the function is called
it will return a new instance that possesses the same properties. All
arguments to the function must satisfy ICSSSelector.
Example:
(defselector p)
;; => #'user/p
(defpseudoelement first-letter)
;; => #'user/first-letter
(first-letter)
;; => #<CssSelector garden.selectors.CssSelector@20aef718>
(p/selector (p first-letter))
;; => \"p::first-letter\"
;; Where p/selector is garden.protocols/selector
"
[sym]
`(defselector ~sym ~(str "::" (name sym)))))
;;----------------------------------------------------------------------
;; Type selectors classes
(def ^:private html-tags
'[a
abbr
address
area
article
aside
audio
b
base
bdi
bdo
blockquote
body
br
button
canvas
caption
cite
code
col
colgroup
command
datalist
dd
del
details
dfn
div
dl
dt
em
embed
fieldset
figcaption
figure
footer
form
h1
h2
h3
h4
h5
h6
head
header
hgroup
hr
html
i
iframe
img
input
ins
kbd
keygen
label
legend
li
link
map
mark
math
menu
meta
meter
nav
noscript
object
ol
optgroup
option
output
p
param
pre
progress
q
rp
rt
ruby
s
samp
script
section
select
small
source
span
strong
style
sub
summary
sup
svg
table
tbody
td
textarea
tfoot
th
thead
time
title
tr
track
u
ul
var
video
wbr])
#?(:clj
(defmacro ^:private gen-type-selector-defs []
`(do
~@(for [tag html-tags
:let [doc (str "CSS " tag " type selector.")
tag (vary-meta tag assoc :doc doc)]]
`(defselector ~tag)))))
(gen-type-selector-defs)
;;----------------------------------------------------------------------
;; Pseudo classes
(def ^:private pseudo-classes
'[active
checked
default
disabled
empty
enabled
first
first-child
first-of-type
fullscreen
focus
marker
hover
indeterminate
in-range
invalid
last-child
last-of-type
left
links
only-child
only-of-type
optional
out-of-range
read-only
read-write
required
right
root
scope
target
valid
visited])
#?(:clj
(defn- gen-pseudo-class-def [p]
(let [p (vary-meta p assoc :doc (str "CSS :" p " pseudo-class selector."))]
`(defpseudoclass ~p))))
#?(:clj
(defmacro ^:private gen-pseudo-class-defs []
`(do
~@(for [p pseudo-classes]
(gen-pseudo-class-def p)))))
(gen-pseudo-class-defs)
;;----------------------------------------------------------------------
;; Structural pseudo classes
(defpseudoclass lang [language]
(name language))
(defpseudoclass not [selector]
(css-selector selector))
;; SEE: http://www.w3.org/TR/selectors/#nth-child-pseudo
(def nth-child-re
#?(:clj
#"\s*(?i:[-+]?\d+n\s*(?:[-+]\s*\d+)?|[-+]?\d+|odd|even)\s*")
#?(:cljs
(js/RegExp. "\\s*(?:[-+]?\\d+n\\s*(?:[-+]\\s*\\d+)?|[-+]?\\d+|odd|even)\\s*"
"i")))
(defn nth-x
"nth-child helper."
[x]
(assert (or (string? x) (keyword? x) (symbol? x))
"Argument must be a string, keyword, or symbol")
(let [s (name x)]
(if-let [m (re-matches nth-child-re s)]
m
(throw (ex-info
"Selector must be either a keyword, string, or symbol." (str "Invalid value " (pr-str s)))))))
(defpseudoclass
^{:doc "CSS :nth-child pseudo class selector."}
nth-child [x]
(if (number? x)
(nth-x (str x "n"))
(nth-x x)))
(defpseudoclass
^{:doc "CSS :nth-last-child pseudo class selector."}
nth-last-child [x]
(nth-x x))
(defpseudoclass
^{:doc "CSS :nth-of-type pseudo class selector."}
nth-of-type [x]
(nth-x x))
(defpseudoclass
^{:doc "CSS :nth-last-of-type pseudo class selector."}
nth-last-of-type [x]
(nth-x x))
;; ---------------------------------------------------------------------
;; Pseudo elements
(defpseudoelement
^{:doc "CSS ::after pseudo element selector."}
after)
(defpseudoelement
^{:doc "CSS ::before pseudo element selector."}
before)
(defpseudoelement
^{:doc "CSS ::first-letter pseudo element selector."}
first-letter)
(defpseudoelement
^{:doc "CSS ::first-line pseudo element selector."}
first-line)
;; ---------------------------------------------------------------------
;; Attribute selectors
;; SEE: http://www.w3.org/TR/selectors/#attribute-selectors
(defn attr
([attr-name]
(selector (str \[ (name attr-name) \])))
([attr-name op attr-value]
(let [v (name attr-value)
;; Wrap the value in quotes unless it's already
;; quoted to prevent emitting bad selectors.
v (if (re-matches #"\"(\\|[^\"])*\"|'(\\|[^\'])*'" v)
v
(pr-str v))]
(selector (str \[ (name attr-name) (name op) v \])))))
(defn attr= [attr-name attr-value]
(attr attr-name "=" attr-value))
(defn attr-contains [attr-name attr-value]
(attr attr-name "~=" attr-value))
(defn attr-starts-with [attr-name attr-value]
(attr attr-name "^=" attr-value))
;; TODO: This needs a better name.
(defn attr-starts-with* [attr-name attr-value]
(attr attr-name "|=" attr-value))
(defn attr-ends-with [attr-name attr-value]
(attr attr-name "$=" attr-value))
(defn attr-matches [attr-name attr-value]
(attr attr-name "*=" attr-value))
;;----------------------------------------------------------------------
;; Selectors combinators
;; SEE: http://www.w3.org/TR/selectors/#combinators
(defn descendant
"Descendant combinator."
([a b]
(selector (str (css-selector a) " " (css-selector b))))
([a b & more]
(->> (cons (descendant a b) more)
(clojure.core/map css-selector)
(string/join " ")
(selector))))
(defn +
"Adjacent sibling combinator."
[a b]
(selector (str (css-selector a) " + " (css-selector b))))
(defn -
"General sibling combinator."
[a b]
(selector (str (css-selector a) " ~ " (css-selector b))))
(defn >
"Child combinator."
([a]
(selector a))
([a b]
(selector (str (css-selector a) " > " (css-selector b))))
([a b & more]
(->> (cons (> a b) more)
(clojure.core/map css-selector)
(string/join " > ")
(selector))))
;; ---------------------------------------------------------------------
;; Special selectors
(defselector