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|
module HTMLGen
open Types
open Shared
open Logger
open HTMLGenHelpers
/// convert TFrmtedString to string, with HTML tags where necessary
let rec strFStr fStr =
match fStr with
| Literal str -> str
| Code str -> str |> attachSimpleTag "code"
| Strong a -> strInlineElements a |> attachSimpleTag "strong"
| Emphasis e -> strInlineElements e |> attachSimpleTag "em"
| Line l -> strInlineElements l
| Strike l -> strInlineElements l |> attachSimpleTag "del"
/// convert InlineElement list to string, with HTML tags where necessary
/// not tail recursive because the code looks cleaner this way
and strInlineElements eles =
let convertHtml pStr ele =
let refPrint foot (ht,id) =
ht
|> strFStr
|> attachHTMLTag ("a", [("href", "#"+id)], true)
|> (fun r -> if foot then attachSimpleTag "sup" r else r)
pStr +
match ele with
| FrmtedString fStr -> strFStr fStr
| Link (ht, url) -> strFStr ht |> attachHTMLTag ("a", [("href", url)], true)
| Picture (alt, url) ->
let attrs = [("src", url); ("alt", alt)]
attachHTMLTag ("img", attrs, false) ""
// style for inline referencing the footnotes and citations in the end
| InlineCitation (ht, id) -> refPrint false (ht,id)
| InlineFootnote (ht, id) -> refPrint true (ht,id)
List.fold convertHtml "" eles
/// process Markdown paragraph
let strParagraph lines =
let folder pLinesStr line =
pLinesStr + strInlineElements line + NewLineStr
List.fold folder "" lines
|> (fun x -> x.Trim()) // remove leading and trailing whitespaces and CRLFs
|> attachSimpleTag "p"
/// process Markdown Table
let strTable (rows: PRow list) =
// filter out table header
let containHeader (row: PRow) =
//let PCells(_, isHeader) = row
match row with
| PCells(_, isHeader) ->
isHeader
let takeoutCells = List.map (fun pRow -> match pRow with | PCells(cells,_) -> cells)
let headerRows = List.filter (containHeader) rows |> takeoutCells
let bodyRows = List.filter (containHeader >> not) rows |> takeoutCells
let foldCells row =
let cellsFolder pStr cell =
match cell with
| CellLine(line, isHeader, align) ->
let tagName = if isHeader then "th" else "td"
let cellContent = strInlineElements line
let alignAttr =
match align with
| Centre -> ("align", "center")
| Right -> ("align", "right")
| Left -> ("align", "left")
| NoAlign -> ("","")
pStr + attachHTMLTag (tagName, [alignAttr], true) cellContent
List.fold cellsFolder "" row
let foldRows rows =
let rowsFolder pStr row =
foldCells row
|> attachSimpleTag "tr"
|> fun s -> pStr + s
List.fold rowsFolder "" rows
foldRows headerRows |> attachSimpleTag "thead"
|> fun s ->
s + (foldRows bodyRows |> attachSimpleTag "tbody")
|> attachSimpleTag "table"
/// recursively process a list
let rec strList list =
let strListItem pStr li =
pStr + (
match li with
| StringItem(line) -> strInlineElements line |> attachSimpleTag "li"
| NestedList(list) -> strList list
)
match list with
| {ListType=lt; ListItem=liS} ->
match lt with
| UL ->
List.fold strListItem "" liS
|> attachSimpleTag "ul"
| OL startNo ->
List.fold strListItem "" liS
|> attachHTMLTag ("ol", ["start", startNo|>string], true)
/// process header
let strHeader (header,id) =
match header with
| {HeaderName=line;Level=lv} ->
let tagName = "h" + string(lv)
line
|> strInlineElements
|> attachHTMLTag (tagName, ["id", id], true)
/// process references
/// id: the href id used in inline referencing
/// content: of TLine type, to be displayed at the end of HTML doc
let strRef (id, content) =
"["+id+"] " + strInlineElements content
|> attachHTMLTag ("p", ["id", id], true)
let (|MatchHeaderAndSubHeader|_|) hds =
match hds with
| fstHd::sndHd::_ ->
let {Level=fstLv} = fstHd
let {Level=sndLv} =sndHd
if sndLv > fstLv then (List.head hds, List.tail hds) |> Some else None
| _ -> None
/// process table of contents
let strToC (toc: Ttoc) =
let excludeSelfSkip x = match x with | None -> None | Some 1 -> None | Some n -> Some (n-1)
/// get all list items in current item level and sub lists
let rec getCurrentHeaders currentLv hdListItems headers =
match headers with
| header:: reHeaders ->
match header.Level with
| hdLv when currentLv <= hdLv -> // list item and sub list item
getCurrentHeaders currentLv (header::hdListItems) reHeaders
| _ -> hdListItems |> List.rev
| [] -> hdListItems |> List.rev
let rec parseHdsIntoList level (headers: THeader list) =
let depth = (List.head headers).Level
let headerFolder (currentLv, listItems, (skipNo: int option), currentHdNo) header =
match skipNo with
| None ->
match header.Level with
| hdLv when hdLv=currentLv ->
(currentLv, StringItem(header.HeaderName)::listItems, None, currentHdNo+1)
| hdLv when hdLv>currentLv ->
let (listItem, skip) =
xOnwards currentHdNo headers
|> getCurrentHeaders (currentLv+1) []
|> parseHdsIntoList (currentLv+1)
(currentLv, NestedList(listItem)::listItems, skip |> excludeSelfSkip, currentHdNo+1)
| _ -> failwith "list item level < current level, not possible"
| Some skip ->
match skip with
| 1 -> (currentLv, listItems, None, currentHdNo+1)
| n when n>1 -> (currentLv, listItems, Some (n-1), currentHdNo+1)
| _ -> failwith "negative or zero skip number, not possible"
List.fold headerFolder (level, [], None, 0) headers
|> (fun (_, lis, _, _) ->
let doSkip =
match List.length headers with
| 0 -> None
| n -> Some n
{ListType=OL 1; ListItem=lis |> List.rev; Depth=depth}, doSkip)
toc.HeaderLst
|> parseHdsIntoList 1
|> fst
|> strList
/// process HTML body part
let strBody pObjs =
let folder pStr pObj =
pStr +
match pObj with
| Paragraph p -> strParagraph p
| Quote q -> strInlineElements q |> attachSimpleTag "q"
| CodeBlock (c, l) -> attachHTMLTag ("code", [("language", mapLang l)], true) c
| Table rows -> strTable rows
| List l -> strList l
| Header (h,s) -> strHeader (h,s)
| Footnote (i,s) -> strRef ((string i), s)
| Citation (i,_,s) -> strRef (i, s)
| ContentTable toc -> strToC toc
| _ -> sprintf "%A is not implemented" pObj
List.fold folder "" pObjs
/// generate HTML head
let genHead htmlTitle =
let metaData =
[
[("name", "viewport");("content", "width=device-width")]
]
let genMetadata pStr md =
pStr + attachMetaTag "meta" md
List.fold genMetadata "" metaData
+ attachSimpleTag "title" htmlTitle
|> attachSimpleTag "head"
/// generate HTML body
let genBody (pObjs) =
strBody pObjs
// insert javascript in the end of HTML doc to make page rendering faster
+
attachHTMLTag ("script",
[
("type", "text/javascript");
("async", "");
("src", "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-MML-AM_CHTML")
], true) ""
|> attachSimpleTag "body"
/// top level HTMLGen
let genHTML (htmlTitle, pObjs) =
attachMetaTag "!DOCTYPE" ["html", ""]
+ genHead htmlTitle
+ genBody (pObjs)
|
