Support ... in element attributes (#16)

For passing arbitrary attributes to elements.

src/nodes/element.jl

@@ -21,7 +21,9 @@ end
 
 function expression(c::BuilderContext, a::Attribute)
     name = Symbol(a.name)
-    if a.dynamic
+    if name == :...
+        return Expr(:(...), Meta.parse(a.value))
+    elseif a.dynamic
         return Expr(:(kw), name, Meta.parse(a.value))
     elseif a.interpolate
         return Expr(:(kw), name, Meta.parse("\"\"\"$(a.value)\"\"\""))

src/nodes/function.jl

@@ -7,9 +7,9 @@ struct Prop
 
     function Prop(name, value)
         vararg = false
-        if endswith(name, "...")
+        if endswith(name, __SPECIAL_SPLAT_SYMBOL__)
             name == value || error("invalid syntax for '...' prop: $(name)...=$(value).")
-            name, _ = rsplit(name, "..."; limit = 2)
+            name, _ = rsplit(name, __SPECIAL_SPLAT_SYMBOL__; limit = 2)
             value = name
             vararg = true
         end

src/symbol-swapping.jl

@@ -1,16 +1,27 @@
 const __SPECIAL_AT_SYMBOL__ = "__special_at_symbol__"
 const __SPECIAL_DOLLAR_SYMBOL__ = "__special_dollar_symbol__"
+const __SPECIAL_SPLAT_SYMBOL__ = "__special_splat_symbol__"
 
 function _swap_special_symbols(s::String)::String
-    return _replace(s, "@" => __SPECIAL_AT_SYMBOL__, "\$" => __SPECIAL_DOLLAR_SYMBOL__)
+    return _replace(
+        s,
+        "@" => __SPECIAL_AT_SYMBOL__,
+        "\$" => __SPECIAL_DOLLAR_SYMBOL__,
+        "..." => __SPECIAL_SPLAT_SYMBOL__,
+    )
 end
 
 function _restore_special_symbols(other)
     return other
 end
 
 function _restore_special_symbols(s::AbstractString)
-    return _replace(s, __SPECIAL_AT_SYMBOL__ => "@", __SPECIAL_DOLLAR_SYMBOL__ => "\$")
+    return _replace(
+        s,
+        __SPECIAL_AT_SYMBOL__ => "@",
+        __SPECIAL_DOLLAR_SYMBOL__ => "\$",
+        __SPECIAL_SPLAT_SYMBOL__ => "...",
+    )
 end
 
 @static if VERSION >= v"1.7"

test/runtests.jl

@@ -198,6 +198,21 @@ end
             b = 10,
         )
 
+        @test_reference joinpath(basic, "splatted-props.1.txt") render(
+            Templates.var"splatted-props";
+            props = (;),
+        )
+
+        @test_reference joinpath(basic, "splatted-props.2.txt") render(
+            Templates.var"splatted-props";
+            props = (; value = 2),
+        )
+
+        @test_reference joinpath(basic, "splatted-props.3.txt") render(
+            Templates.var"splatted-props";
+            props = (; option = "option"),
+        )
+
         @test_throws_st UndefVarError render(Templates.var"file-and-line-info-1") [
             "file-and-line-info.html:2",
             "file-and-line-info.html:1",

test/templates.jl

@@ -15,6 +15,7 @@ template"templates/basic/layout-usage.html"
 template"templates/basic/special-symbols.html"
 template"templates/basic/custom-elements.html"
 template"templates/basic/splat.html"
+template"templates/basic/splatted-props.html"
 template"templates/basic/file-and-line-info.html"
 
 module Complex

test/templates/basic/splatted-props.1.txt

@@ -0,0 +1 @@
+<div><b>1</b><div other="1"></div></div>

test/templates/basic/splatted-props.2.txt

@@ -0,0 +1 @@
+<div><b>2</b><div value="2" other="1"></div></div>

test/templates/basic/splatted-props.3.txt

@@ -0,0 +1 @@
+<div><b>1</b><div option other="1"></div></div>

test/templates/basic/splatted-props.html

@@ -0,0 +1,12 @@
+<function splatted-props props>
+    <div>
+        <splatted-props-inner ...=props />
+        <div ...="merge(props, (; other = 1))"></div>
+    </div>
+</function>
+
+<function splatted-props-inner value="1" _...>
+    <b>
+        <julia value />
+    </b>
+</function>