Add support for ... props (#14)

src/nodes/function.jl

@@ -3,9 +3,17 @@ const TEMPLATE_FUNCTION_TAG = "function"
 struct Prop
     name::String
     value::String
+    vararg::Bool
 
     function Prop(name, value)
-        return new(_restore_special_symbols(name), _restore_special_symbols(value))
+        vararg = false
+        if endswith(name, "...")
+            name == value || error("invalid syntax for '...' prop: $(name)...=$(value).")
+            name, _ = rsplit(name, "..."; limit = 2)
+            value = name
+            vararg = true
+        end
+        return new(_restore_special_symbols(name), _restore_special_symbols(value), vararg)
     end
 end
 
@@ -17,8 +25,12 @@ function expression(c::BuilderContext, p::Prop)
     name = Symbol(p.name)
     if p.name == p.value
         # Required keyword with no default value or type.
-        return name
+        return p.vararg ? Expr(:(...), name) : name
     else
+        # Gaurd against this condition, although it should have already been caught
+        # during initialization of `Prop`.
+        p.vararg && error("invalid syntax for '...' prop: $(name)...=$(p.value).")
+
         expr = Meta.parse(p.value)
         if MacroTools.@capture(expr, default_::Type_)
             # Keyword with default value and type.

test/runtests.jl

@@ -132,6 +132,36 @@ end
             Templates.var"custom-elements-nested";
             value = true,
         )
+
+        @test_reference joinpath(basic, "splat-args.1.txt") render(
+            Templates.var"splat-args";
+            key = :value,
+        )
+
+        @test_reference joinpath(basic, "splat-args.2.txt") render(
+            Templates.var"splat-args";
+        )
+
+        @test_reference joinpath(basic, "splat-args.3.txt") render(
+            Templates.var"splat-args";
+            a = 1,
+            b = 2,
+        )
+
+        @test_reference joinpath(basic, "splat-args-2.1.txt") render(
+            Templates.var"splat-args-2";
+        )
+
+        @test_reference joinpath(basic, "splat-args-2.2.txt") render(
+            Templates.var"splat-args-2";
+            a = 2,
+        )
+
+        @test_reference joinpath(basic, "splat-args-2.3.txt") render(
+            Templates.var"splat-args-2";
+            a = 2,
+            b = 10,
+        )
     end
 
     @testset "complex" begin

test/templates.jl

@@ -14,6 +14,7 @@ template"templates/basic/layout.html"
 template"templates/basic/layout-usage.html"
 template"templates/basic/special-symbols.html"
 template"templates/basic/custom-elements.html"
+template"templates/basic/splat.html"
 
 module Complex
 

test/templates/basic/splat-args-2.1.txt

@@ -0,0 +1 @@
+<ul><li><p id="a">1</p></li></ul>

test/templates/basic/splat-args-2.2.txt

@@ -0,0 +1 @@
+<ul><li><p id="a">2</p></li></ul>

test/templates/basic/splat-args-2.3.txt

@@ -0,0 +1 @@
+<ul><li><p id="a">2</p></li><li><p id="k">b</p><p id="v">10</p></li></ul>

test/templates/basic/splat-args.1.txt

@@ -0,0 +1 @@
+<ul><li><p id="key">key</p><p id="value">value</p></li></ul>

test/templates/basic/splat-args.2.txt

@@ -0,0 +1 @@
+<ul></ul>

test/templates/basic/splat-args.3.txt

@@ -0,0 +1 @@
+<ul><li><p id="key">a</p><p id="value">1</p></li><li><p id="key">b</p><p id="value">2</p></li></ul>

test/templates/basic/splat.html

@@ -0,0 +1,34 @@
+<function splat-args args...>
+    <ul>
+        <for iter="args" item="arg">
+            <li>
+                <p id="key">
+                    <julia value="arg[1]" />
+                </p>
+                <p id="value">
+                    <julia value="arg[2]" />
+                </p>
+            </li>
+        </for>
+    </ul>
+</function>
+
+<function splat-args-2 a="1" args...>
+    <ul>
+        <li>
+            <p id="a">
+                <julia value="a" />
+            </p>
+        </li>
+        <for iter="args" item="arg">
+            <li>
+                <p id="k">
+                    <julia value="arg[1]" />
+                </p>
+                <p id="v">
+                    <julia value="arg[2]" />
+                </p>
+            </li>
+        </for>
+    </ul>
+</function>