mdbook-embedify 0.3.2

A rust based mdbook preprocessor plugin that allows you to embed apps to your book, like youtube, codepen, giscus and many other apps
Documentation 
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// ---
// Common rules
WHITESPACE    = _{ " " }
opener        =  { "{%" }
closer        =  { "%}" }
identifier    = @{ (ASCII_ALPHANUMERIC | "_" | "-")+ }
quoted_string = @{ ("\"" ~ (!"\"" ~ ANY)* ~ "\"") | ("'" ~ (!"'" ~ ANY)* ~ "'") }

// ---
// Embed rules
embed_name         = { identifier }
embed_option_name  = { identifier }
embed_option_value = { identifier | quoted_string }
embed_option       = { embed_option_name ~ "=" ~ embed_option_value }
embed_options      = { embed_option+ }

embed = { opener ~ "embed" ~ embed_name ~ embed_options? ~ closer }

// ---
// Placeholder rules
placeholder_method   = { identifier }
placeholder_key      = { identifier }
placeholder_default  = { identifier | quoted_string }
placeholder_argument = { placeholder_key ~ ("=" ~ placeholder_default)? }

// ---
// Placeholder rules
placeholder = { opener ~ ((placeholder_method ~ "(" ~ placeholder_argument ~ ")") | (placeholder_argument)) ~ closer }