// WHITESPACE = _{ " " | "\t" | NEWLINE }

file = _{ SOI ~ NEWLINE* ~ (block ~ NEWLINE*)* ~ EOI }

block = { code_block | latex_block | header | unordered_list | ordered_list | paragraph }
    header = { "#"+ ~ span }
    unordered_list = { unordered_list_item+ }
        unordered_list_item = { "-" ~ span ~ NEWLINE }
    ordered_list = { ordered_list_item+ }
        ordered_list_item = { ASCII_DIGIT+ ~ "." ~ span ~ NEWLINE }
    paragraph = { span }
    code_block = { "```" ~ code_block_lang ~ NEWLINE ~ code_block_inner ~ "```" }
        code_block_lang = { ASCII_ALPHANUMERIC* }
        code_block_inner = { (!"```" ~ ANY)* }
    latex_block = { "$$" ~ latex_block_inner ~ "$$" }
        latex_block_inner = { (!"$$" ~ ANY)* }

span = { (style_bold | style_italic | style_code | inline_latex | text)+ }
    style_bold = { "**" ~ text ~ "**" }
    style_italic = { "_" ~ text ~ "_" }
    style_code = { "`" ~ code_inner ~ "`" }
        code_inner = { (!"`" ~ ANY)+ }
    inline_latex = { "$" ~ latex_inner ~ "$" }
        latex_inner = { (!"$" ~ ANY)+ }
    
    text = { (!("\n" ~ forbidden_span_wrap | "*" | "_" | "`" | "$") ~ ANY)+ }
    forbidden_span_wrap = _{ "\n" | "-" | ASCII_DIGIT+ ~ "." }