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surface
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0.1.0-alpha.1
0.1.0-alpha.0
A component based library for Phoenix LiveView
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lib/surface/renderer.ex
defmodule Surface.Renderer do
@moduledoc false
defmacro __before_compile__(env) do
render? = Module.defines?(env.module, {:render, 1})
root = Path.dirname(env.file)
filename = template_filename(env)
template = Path.join(root, filename)
case {render?, File.exists?(template)} do
{true, true} ->
IO.warn(
"ignoring template #{inspect(template)} because the component " <>
"#{inspect(env.module)} defines a render/1 function",
Macro.Env.stacktrace(env)
)
:ok
{true, false} ->
:ok
{false, true} ->
ast =
template
|> File.read!()
|> Surface.Compiler.compile(1, env, template)
|> Surface.Compiler.to_live_struct()
quote do
@file unquote(template)
@external_resource unquote(template)
def render(var!(assigns)) do
unquote(ast)
end
end
_ ->
message = ~s'''
render/1 was not implemented for #{inspect(env.module)}.
Make sure to either explicitly define a render/1 clause with a Surface template:
def render(assigns) do
~H"""
...
"""
end
Or create a file at #{inspect(template)} with the Surface template.
'''
IO.warn(message, Macro.Env.stacktrace(env))
quote do
@external_resource unquote(template)
def render(_assigns) do
raise unquote(message)
end
end
end
end
defp template_filename(env) do
env.module
|> Module.split()
|> List.last()
|> Macro.underscore()
|> Kernel.<>(".sface")
end
end