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1232 lines (1091 loc) · 41.7 KB
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#nowarn "10001"
namespace FSharp.Data
open System
open System.IO
open System.Text
open System.Text.RegularExpressions
open FSharp.Data
open FSharp.Data.Runtime
open System.Runtime.InteropServices
open System.Collections.Generic
// --------------------------------------------------------------------------------------
module private TextParser =
let toPattern f c = if f c then ValueSome c else ValueNone
[<return: Struct>]
let (|EndOfFile|_|) (c: char) =
let value = c |> int
if (value = -1 || value = 65535) then
ValueSome c
else
ValueNone
[<return: Struct>]
let (|Whitespace|_|) = toPattern Char.IsWhiteSpace
[<return: Struct>]
let (|LetterDigit|_|) = toPattern Char.IsLetterOrDigit
[<return: Struct>]
let (|Letter|_|) = toPattern Char.IsLetter
// --------------------------------------------------------------------------------------
module internal HtmlParser =
let wsRegex = lazy Regex("\\s+", RegexOptions.Compiled)
let invalidTypeNameRegex = lazy Regex("[^0-9a-zA-Z_]+", RegexOptions.Compiled)
let headingRegex = lazy Regex("""h\d""", RegexOptions.Compiled)
type HtmlToken =
| DocType of string
| Tag of isSelfClosing: bool * name: string * attrs: HtmlAttribute list
| TagEnd of string
| Text of string
| Comment of string
| CData of string
| InlineWhitespace // normalised whitespace-only DefaultMode text; kept only between inline siblings
| EOF
override x.ToString() =
match x with
| DocType dt -> sprintf "doctype %s" dt
| Tag(selfClose, name, _) -> sprintf "tag %b %s" selfClose name
| TagEnd name -> sprintf "tagEnd %s" name
| Text _ -> "text"
| Comment _ -> "comment"
| EOF -> "eof"
| CData _ -> "cdata"
| InlineWhitespace -> "inlineWhitespace"
member x.IsEndTag name =
match x with
| TagEnd(endName) when name = endName -> true
| _ -> false
type TextReader with
member x.PeekChar() = x.Peek() |> char
member x.ReadChar() = x.Read() |> char
member x.ReadNChar(n) =
let buffer = Array.zeroCreate n
x.ReadBlock(buffer, 0, n) |> ignore
String(buffer)
type CharList =
{ mutable Contents: StringBuilder }
static member Empty = { Contents = StringBuilder() }
override x.ToString() = x.Contents.ToString()
member x.Cons(c: char) = x.Contents.Append(c) |> ignore
member x.Length = x.Contents.Length
member x.Clear() = x.Contents.Clear() |> ignore
type InsertionMode =
| DefaultMode
| ScriptMode
| CharRefMode
| CommentMode
| DocTypeMode
| CDATAMode
override x.ToString() =
match x with
| DefaultMode -> "default"
| ScriptMode -> "script"
| CharRefMode -> "charref"
| CommentMode -> "comment"
| DocTypeMode -> "doctype"
| CDATAMode -> "cdata"
type HtmlState =
{ mutable Attributes: (CharList * CharList) list
mutable CurrentTag: CharList
mutable Content: CharList
mutable HasFormattedParent: bool
mutable InsertionMode: InsertionMode
mutable Tokens: HtmlToken list
Reader: TextReader }
static member Create(reader: TextReader) =
{ Attributes = []
CurrentTag = { Contents = StringBuilder() }
Content = { Contents = StringBuilder() }
HasFormattedParent = false
InsertionMode = DefaultMode
Tokens = []
Reader = reader }
member x.Pop() = x.Reader.Read() |> ignore
member x.Peek() = x.Reader.PeekChar()
member x.Pop(count) =
Array.init count (fun _ -> x.Reader.ReadChar())
member x.Contents = x.Content.ToString()
member x.ContentLength = x.Content.Length
member x.NewAttribute() =
x.Attributes <- ({ Contents = StringBuilder() }, { Contents = StringBuilder() }) :: x.Attributes
member x.ConsAttrName() =
match x.Attributes with
| [] ->
x.NewAttribute()
x.ConsAttrName()
| (h, _) :: _ -> h.Cons(Char.ToLowerInvariant(x.Reader.ReadChar()))
member x.CurrentTagName() = x.CurrentTag.ToString().Trim()
member x.CurrentAttrName() =
match x.Attributes with
| [] -> String.Empty
| (h, _) :: _ -> h.ToString()
member x.ConsAttrValue(c) =
match x.Attributes with
| [] ->
x.NewAttribute()
x.ConsAttrValue(c)
| (_, h) :: _ -> h.Cons(c)
member x.ConsAttrValue() = x.ConsAttrValue(x.Reader.ReadChar())
member x.GetAttributes() =
x.Attributes
|> List.choose (fun (key, value) ->
if key.Length > 0 then
Some <| HtmlAttribute(key.ToString(), value.ToString())
else
None)
|> List.rev
member x.EmitSelfClosingTag() =
let name = x.CurrentTag.ToString().Trim()
let result = Tag(true, name, x.GetAttributes())
x.CurrentTag.Clear()
x.InsertionMode <- DefaultMode
x.Attributes <- []
x.Tokens <- result :: x.Tokens
member x.IsFormattedTag =
// Tag names are already lowercased at read time (ConsTag applies ToLowerInvariant),
// so no need to call ToLowerInvariant here.
match x.CurrentTagName() with
| "pre" -> true
| _ -> false
member x.IsScriptTag =
// Tag names are already lowercased at read time (ConsTag applies ToLowerInvariant),
// so no need to call ToLowerInvariant here.
match x.CurrentTagName() with
| "script"
| "style" -> true
| _ -> false
member x.EmitTag(isEnd) =
let name = x.CurrentTag.ToString().Trim()
let result =
if isEnd then
if x.ContentLength > 0 then
x.Emit()
TagEnd(name)
else
TagEnd(name)
else
Tag(false, name, x.GetAttributes())
// "pre" is the only default formatted tag; nested pre elements are not
// allowed in the spec. Use `name` directly to avoid re-computing CurrentTagName().
// The else branch (x.HasFormattedParent <- x.HasFormattedParent || false) was a
// no-op and has been removed.
if name = "pre" then
x.HasFormattedParent <- not isEnd
x.InsertionMode <-
if (name = "script" || name = "style") && (not isEnd) then
ScriptMode
else
DefaultMode
x.CurrentTag.Clear()
x.Attributes <- []
x.Tokens <- result :: x.Tokens
member x.EmitToAttributeValue() =
assert (x.InsertionMode = InsertionMode.CharRefMode)
let content = x.Content.ToString() |> HtmlCharRefs.substitute
for c in content do
x.ConsAttrValue c
x.Content.Clear()
x.InsertionMode <- DefaultMode
member x.Emit() : unit =
let result =
let content = x.Content.ToString()
match x.InsertionMode with
| DefaultMode ->
if x.HasFormattedParent then
Text content
else
let normalizedContent = wsRegex.Value.Replace(content, " ")
if normalizedContent = " " then
InlineWhitespace // inter-element whitespace; kept only between inline siblings
else
Text normalizedContent
| ScriptMode -> content |> Text
| CharRefMode -> content.Trim() |> HtmlCharRefs.substitute |> Text
| CommentMode -> Comment content
| DocTypeMode -> DocType content
| CDATAMode -> CData(content.Replace("<![CDATA[", "").Replace("]]>", ""))
x.Content.Clear()
x.InsertionMode <- DefaultMode
match result with
| Text t when String.IsNullOrEmpty(t) -> ()
| _ -> x.Tokens <- result :: x.Tokens
member x.Cons() = x.Content.Cons(x.Reader.ReadChar())
member x.Cons(char: char) = x.Content.Cons(char)
member x.Cons(chars: char array) =
x.Content.Contents.Append(chars) |> ignore
member x.Cons(chars: string) =
x.Content.Contents.Append(chars) |> ignore
member x.ConsTag() =
match x.Reader.ReadChar() with
| TextParser.Whitespace _ -> ()
| a -> x.CurrentTag.Cons(Char.ToLowerInvariant a)
member x.ClearContent() = x.Content.Clear()
// Tokenises a stream into a sequence of HTML tokens.
let private tokenise reader =
let state = HtmlState.Create reader
let rec data (state: HtmlState) =
match state.Peek() with
| '<' ->
if state.ContentLength > 0 then
state.Emit()
else
state.Pop()
tagOpen state
| TextParser.EndOfFile _ -> state.Tokens <- EOF :: state.Tokens
| '&' ->
if state.ContentLength > 0 then
state.Emit()
else
state.InsertionMode <- CharRefMode
charRef state
| _ ->
match state.InsertionMode with
| DefaultMode ->
state.Cons()
data state
| ScriptMode -> script state
| CharRefMode -> charRef state
| DocTypeMode -> docType state
| CommentMode -> comment state
| CDATAMode -> data state
and script state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| ''' ->
state.Cons()
scriptSingleQuoteString state
| '"' ->
state.Cons()
scriptDoubleQuoteString state
| '/' ->
state.Cons()
scriptSlash state
| '<' ->
state.Pop()
scriptLessThanSign state
| _ ->
state.Cons()
script state
and scriptSingleQuoteString state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| ''' ->
state.Cons()
script state
| '\\' ->
state.Cons()
scriptSingleQuoteStringBackslash state
| _ ->
state.Cons()
scriptSingleQuoteString state
and scriptDoubleQuoteString state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '"' ->
state.Cons()
script state
| '\\' ->
state.Cons()
scriptDoubleQuoteStringBackslash state
| _ ->
state.Cons()
scriptDoubleQuoteString state
and scriptSingleQuoteStringBackslash state =
match state.Peek() with
| _ ->
state.Cons()
scriptSingleQuoteString state
and scriptDoubleQuoteStringBackslash state =
match state.Peek() with
| _ ->
state.Cons()
scriptDoubleQuoteString state
and scriptSlash state =
match state.Peek() with
| '/' ->
state.Cons()
scriptSingleLineComment state
| '*' ->
state.Cons()
scriptMultiLineComment state
| _ -> script state
and scriptMultiLineComment state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '*' ->
state.Cons()
scriptMultiLineCommentStar state
| _ ->
state.Cons()
scriptMultiLineComment state
and scriptMultiLineCommentStar state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '/' ->
state.Cons()
script state
| _ -> scriptMultiLineComment state
and scriptSingleLineComment state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '\n' ->
state.Cons()
script state
| _ ->
state.Cons()
scriptSingleLineComment state
and scriptLessThanSign state =
match state.Peek() with
| '/' ->
state.Pop()
scriptEndTagOpen state
| '!' ->
state.Cons('<')
state.Cons()
scriptDataEscapeStart state
| _ ->
state.Cons('<')
state.Cons()
script state
and scriptDataEscapeStart state =
match state.Peek() with
| '-' ->
state.Cons()
scriptDataEscapeStartDash state
| _ -> script state
and scriptDataEscapeStartDash state =
match state.Peek() with
| '-' ->
state.Cons()
scriptDataEscapedDashDash state
| _ -> script state
and scriptDataEscapedDashDash state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataEscapedDashDash state
| '<' ->
state.Pop()
scriptDataEscapedLessThanSign state
| '>' ->
state.Cons()
script state
| _ ->
state.Cons()
scriptDataEscaped state
and scriptDataEscapedLessThanSign state =
match state.Peek() with
| '/' ->
state.Pop()
scriptDataEscapedEndTagOpen state
| TextParser.Letter _ ->
state.Cons('<')
state.Cons()
scriptDataDoubleEscapeStart state
| _ ->
state.Cons('<')
state.Cons()
scriptDataEscaped state
and scriptDataDoubleEscapeStart state =
match state.Peek() with
| TextParser.Whitespace _
| '/'
| '>' when state.IsScriptTag ->
state.Cons()
scriptDataDoubleEscaped state
| TextParser.Letter _ ->
state.Cons()
scriptDataDoubleEscapeStart state
| _ ->
state.Cons()
scriptDataEscaped state
and scriptDataDoubleEscaped state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataDoubleEscapedDash state
| '<' ->
state.Cons()
scriptDataDoubleEscapedLessThanSign state
| _ ->
state.Cons()
scriptDataDoubleEscaped state
and scriptDataDoubleEscapedDash state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataDoubleEscapedDashDash state
| '<' ->
state.Cons()
scriptDataDoubleEscapedLessThanSign state
| _ ->
state.Cons()
scriptDataDoubleEscaped state
and scriptDataDoubleEscapedLessThanSign state =
match state.Peek() with
| '/' ->
state.Cons()
scriptDataDoubleEscapeEnd state
| _ ->
state.Cons()
scriptDataDoubleEscaped state
and scriptDataDoubleEscapeEnd state =
match state.Peek() with
| TextParser.Whitespace _
| '/'
| '>' when state.IsScriptTag ->
state.Cons()
scriptDataDoubleEscaped state
| TextParser.Letter _ ->
state.Cons()
scriptDataDoubleEscapeEnd state
| _ ->
state.Cons()
scriptDataDoubleEscaped state
and scriptDataDoubleEscapedDashDash state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataDoubleEscapedDashDash state
| '<' ->
state.Cons()
scriptDataDoubleEscapedLessThanSign state
| '>' ->
state.Cons()
script state
| _ ->
state.Cons()
scriptDataDoubleEscaped state
and scriptDataEscapedEndTagOpen state =
match state.Peek() with
| TextParser.Letter _ -> scriptDataEscapedEndTagName state
| _ ->
state.Cons([| '<'; '/' |])
state.Cons()
scriptDataEscaped state
and scriptDataEscapedEndTagName state =
match state.Peek() with
| TextParser.Whitespace _ when state.IsScriptTag ->
state.Pop()
beforeAttributeName state
| '/' when state.IsScriptTag ->
state.Pop()
selfClosingStartTag state
| '>' when state.IsScriptTag ->
state.Pop()
state.EmitTag(true)
| '>' ->
state.Cons([| '<'; '/' |])
state.Cons(state.CurrentTagName())
state.CurrentTag.Clear()
script state
| TextParser.Letter _ ->
state.ConsTag()
scriptDataEscapedEndTagName state
| _ ->
state.Cons([| '<'; '/' |])
state.Cons()
scriptDataEscaped state
and scriptDataEscaped state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataEscapedDash state
| '<' -> scriptDataEscapedLessThanSign state
| _ ->
state.Cons()
scriptDataEscaped state
and scriptDataEscapedDash state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| '-' ->
state.Cons()
scriptDataEscapedDashDash state
| '<' -> scriptDataEscapedLessThanSign state
| _ ->
state.Cons()
scriptDataEscaped state
and scriptEndTagOpen state =
match state.Peek() with
| TextParser.Letter _ -> scriptEndTagName state
| _ ->
state.Cons('<')
state.Cons('/')
script state
and scriptEndTagName state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
beforeAttributeName state
| '/' when state.IsScriptTag ->
state.Pop()
selfClosingStartTag state
| '>' when state.IsScriptTag ->
state.Pop()
state.EmitTag(true)
| TextParser.Letter _ ->
state.ConsTag()
scriptEndTagName state
| _ ->
state.Cons([| '<'; '/' |])
state.Cons(state.CurrentTagName())
state.CurrentTag.Clear()
script state
and charRef state =
match state.Peek() with
| ';' ->
state.Cons()
state.Emit()
| '<' -> state.Emit()
// System.IO.TextReader.Read() returns -1
// at end of stream, and -1 cast to char is \uffff.
| '\uffff' -> state.Emit()
| _ ->
state.Cons()
charRef state
and tagOpen state =
match state.Peek() with
| '!' ->
state.Pop()
markupDeclaration state
| '/' ->
state.Pop()
endTagOpen state
| '?' ->
state.Pop()
bogusComment state
| TextParser.Letter _ ->
state.ConsTag()
tagName false state
| _ ->
state.Cons('<')
data state
and bogusComment state =
let rec bogusComment' (state: HtmlState) =
let exitBogusComment state =
state.InsertionMode <- CommentMode
state.Emit()
match state.Peek() with
| '>' ->
state.Cons()
exitBogusComment state
| TextParser.EndOfFile _ -> exitBogusComment state
| _ ->
state.Cons()
bogusComment' state
bogusComment' state
and markupDeclaration state =
match state.Pop(2) with
| [| '-'; '-' |] -> comment state
| current ->
match new String(Array.append current (state.Pop(5))) with
| "DOCTYPE" -> docType state
| "[CDATA[" ->
state.Cons("<![CDATA[")
cData 0 state
| _ -> bogusComment state
and cData i (state: HtmlState) =
match state.Peek() with
| ']' when i = 0 || i = 1 ->
state.Cons()
cData (i + 1) state
| '>' when i = 2 ->
state.Cons()
state.InsertionMode <- CDATAMode
state.Emit()
| TextParser.EndOfFile _ ->
state.InsertionMode <- CDATAMode
state.Emit()
| _ ->
state.Cons()
cData 0 state
and docType state =
match state.Peek() with
| '>' ->
state.Pop()
state.InsertionMode <- DocTypeMode
state.Emit()
| _ ->
state.Cons()
docType state
and comment state =
match state.Peek() with
| '-' ->
state.Pop()
commentEndDash state
| TextParser.EndOfFile _ ->
state.InsertionMode <- CommentMode
state.Emit()
| _ ->
state.Cons()
comment state
and commentEndDash state =
match state.Peek() with
| '-' ->
state.Pop()
commentEndState state
| TextParser.EndOfFile _ ->
state.InsertionMode <- CommentMode
state.Emit()
| _ ->
state.Cons()
comment state
and commentEndState state =
match state.Peek() with
| '>' ->
state.Pop()
state.InsertionMode <- CommentMode
state.Emit()
| TextParser.EndOfFile _ ->
state.InsertionMode <- CommentMode
state.Emit()
| _ ->
state.Cons()
comment state
and tagName isEndTag state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
beforeAttributeName state
| TextParser.EndOfFile _ -> state.EmitTag(isEndTag)
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(isEndTag)
| _ ->
state.ConsTag()
tagName isEndTag state
and selfClosingStartTag state =
match state.Peek() with
| '>' ->
state.Pop()
state.EmitSelfClosingTag()
| TextParser.EndOfFile _ -> data state
| _ -> beforeAttributeName state
and endTagOpen state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| TextParser.Letter _ ->
state.ConsTag()
tagName true state
| '>' ->
state.Pop()
data state
| _ -> comment state
and beforeAttributeName state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
beforeAttributeName state
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(false)
| _ -> attributeName state
and attributeName state =
match state.Peek() with
| '=' ->
state.Pop()
beforeAttributeValue state
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(false)
| TextParser.LetterDigit _ ->
state.ConsAttrName()
attributeName state
| TextParser.Whitespace _ -> afterAttributeName state
| TextParser.EndOfFile _ -> state.EmitTag(false)
| _ ->
state.ConsAttrName()
attributeName state
and afterAttributeName state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
afterAttributeName state
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(false)
| '=' ->
state.Pop()
beforeAttributeValue state
| _ ->
state.NewAttribute()
attributeName state
and beforeAttributeValue state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
beforeAttributeValue state
| TextParser.EndOfFile _ -> state.EmitTag(false)
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(false)
| '"' ->
state.Pop()
attributeValueQuoted '"' state
| '\'' ->
state.Pop()
attributeValueQuoted '\'' state
| _ -> attributeValueUnquoted state
and attributeValueUnquoted state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
state.NewAttribute()
beforeAttributeName state
| '/' ->
state.Pop()
attributeValueUnquotedSlash state
| '>' ->
state.Pop()
state.EmitTag(false)
| '&' ->
assert (state.ContentLength = 0)
state.InsertionMode <- InsertionMode.CharRefMode
attributeValueUnquotedCharRef [ '/'; '>' ] state
| _ ->
state.ConsAttrValue()
attributeValueUnquoted state
and attributeValueUnquotedSlash state =
match state.Peek() with
| '>' -> selfClosingStartTag state
| _ ->
state.ConsAttrValue('/')
state.ConsAttrValue()
attributeValueUnquoted state
and attributeValueQuoted quote state =
match state.Peek() with
| TextParser.EndOfFile _ -> data state
| c when c = quote ->
state.Pop()
afterAttributeValueQuoted state
| '&' ->
assert (state.ContentLength = 0)
state.InsertionMode <- InsertionMode.CharRefMode
attributeValueQuotedCharRef quote state
| _ ->
state.ConsAttrValue()
attributeValueQuoted quote state
and attributeValueQuotedCharRef quote state =
match state.Peek() with
| ';' ->
state.Cons()
state.EmitToAttributeValue()
attributeValueQuoted quote state
| TextParser.EndOfFile _ ->
state.EmitToAttributeValue()
attributeValueQuoted quote state
| c when c = quote ->
state.EmitToAttributeValue()
attributeValueQuoted quote state
| _ ->
state.Cons()
attributeValueQuotedCharRef quote state
and attributeValueUnquotedCharRef stop state =
match state.Peek() with
| ';' ->
state.Cons()
state.EmitToAttributeValue()
attributeValueUnquoted state
| TextParser.EndOfFile _ ->
state.EmitToAttributeValue()
attributeValueUnquoted state
| c when List.exists ((=) c) stop ->
state.EmitToAttributeValue()
attributeValueUnquoted state
| _ ->
state.Cons()
attributeValueUnquotedCharRef stop state
and afterAttributeValueQuoted state =
match state.Peek() with
| TextParser.Whitespace _ ->
state.Pop()
state.NewAttribute()
afterAttributeValueQuoted state
| '/' ->
state.Pop()
selfClosingStartTag state
| '>' ->
state.Pop()
state.EmitTag(false)
| _ ->
state.NewAttribute()
attributeName state
let mutable next = state.Reader.Peek()
while next <> -1 do
data state
next <- state.Reader.Peek()
state.Tokens |> List.rev
// Block-level HTML elements. Whitespace-only text nodes that are siblings of
// these elements are inter-element whitespace and are insignificant.
let private blockLevelElements =
set
[ "address"
"article"
"aside"
"blockquote"
"body"
"caption"
"col"
"colgroup"
"dd"
"details"
"dialog"
"dir"
"div"
"dl"
"dt"
"fieldset"
"figcaption"
"figure"
"footer"
"form"
"frameset"
"h1"
"h2"
"h3"
"h4"
"h5"
"h6"
"head"
"header"
"hgroup"
"html"
"legend"
"li"
"link"
"main"
"menu"
"meta"
"nav"
"noscript"
"ol"
"optgroup"
"option"
"p"
"pre"
"script"
"section"
"style"
"summary"
"table"