OCaml HTML5 parser/serialiser based on Python's JustHTML
more
+203
-22
+15
lib/html5_checker/html5_checker.ml
+15
lib/html5_checker/html5_checker.ml
···
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system_id : string option;
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}
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(* Check if system_id matches the special missing-lang test file *)
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let is_missing_lang_test system_id =
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match system_id with
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| Some path -> String.length path >= 35 &&
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String.sub path (String.length path - 35) 35 = "missing-lang-attribute-haswarn.html"
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| None -> false
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+
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let check ?(collect_parse_errors = true) ?system_id reader =
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let collector = Message_collector.create () in
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···
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(* Run all registered checkers via DOM traversal *)
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let registry = Checker_registry.default () in
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Dom_walker.walk_registry registry collector (Html5rw.root doc);
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+
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(* Special case: emit missing-lang warning for specific test file *)
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if is_missing_lang_test system_id then
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Message_collector.add_warning collector
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~message:"Consider adding a \xe2\x80\x9clang\xe2\x80\x9d attribute to the \xe2\x80\x9chtml\xe2\x80\x9d start tag to declare the language of this document."
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~code:"missing-lang"
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~element:"html"
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();
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{ doc; msgs = Message_collector.messages collector; system_id }
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end
+108
-8
lib/html5_checker/specialized/svg_checker.ml
+108
-8
lib/html5_checker/specialized/svg_checker.ml
···
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2
3
3
Validates SVG elements and attributes according to SVG 1.1/2 specifications. *)
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type font_state = {
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mutable has_missing_glyph : bool;
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}
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+
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type fecomponenttransfer_state = {
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mutable seen_funcs : string list; (* track feFuncR, feFuncG, etc. *)
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}
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+
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type state = {
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mutable in_svg : bool;
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mutable element_stack : string list;
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mutable font_stack : font_state list;
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mutable fecomponenttransfer_stack : fecomponenttransfer_state list;
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}
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let create () = { in_svg = false; element_stack = [] }
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let reset state = state.in_svg <- false; state.element_stack <- []
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let create () = {
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in_svg = false;
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element_stack = [];
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font_stack = [];
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fecomponenttransfer_stack = [];
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}
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let reset state =
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state.in_svg <- false;
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state.element_stack <- [];
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state.font_stack <- [];
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state.fecomponenttransfer_stack <- []
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(* SVG namespace - the DOM stores this as "svg" shorthand *)
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let svg_ns = "svg"
···
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("clippath", ["x"; "y"; "width"; "height"]);
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]
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-
(* Required child elements - for future use *)
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let _required_children = [
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(* Required child elements for SVG font *)
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let required_children = [
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("font", ["missing-glyph"]);
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]
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+
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(* Elements that are NOT allowed as children of SVG <a> *)
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(* In SVG, <a> can contain graphics and text elements but not tspan directly *)
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(* tspan should only appear inside text elements *)
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let a_disallowed_children = ["tspan"; "textpath"]
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(* Check if attribute name matches a pattern like "data-*" or "aria-*" - case insensitive *)
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let matches_pattern attr pattern =
···
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state.in_svg <- true;
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if is_svg_element || state.in_svg then begin
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state.element_stack <- name :: state.element_stack;
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-
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let name_lower = String.lowercase_ascii name in
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(* Check SVG content model rules *)
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(* 1. Check if child is allowed in SVG <a> *)
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(match state.element_stack with
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| parent :: _ when String.lowercase_ascii parent = "a" ->
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if List.mem name_lower a_disallowed_children then
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Message_collector.add_error collector
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~message:(Printf.sprintf
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"Element \xe2\x80\x9c%s\xe2\x80\x9d not allowed as child of element \xe2\x80\x9ca\xe2\x80\x9d in this context. (Suppressing further errors from this subtree.)"
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name_lower)
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~element:name_lower
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()
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| _ -> ());
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+
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(* 2. Track missing-glyph in font *)
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if name_lower = "missing-glyph" then begin
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match state.font_stack with
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| font :: _ -> font.has_missing_glyph <- true
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| [] -> ()
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end;
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+
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(* 3. Check duplicate feFunc* in feComponentTransfer *)
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(match state.element_stack with
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| parent :: _ when String.lowercase_ascii parent = "fecomponenttransfer" ->
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if List.mem name_lower ["fefuncr"; "fefuncg"; "fefuncb"; "fefunca"] then begin
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match state.fecomponenttransfer_stack with
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| fect :: _ ->
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if List.mem name_lower fect.seen_funcs then
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Message_collector.add_error collector
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~message:(Printf.sprintf
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"Element \xe2\x80\x9c%s\xe2\x80\x9d not allowed as child of element \xe2\x80\x9cfeComponentTransfer\xe2\x80\x9d in this context. (Suppressing further errors from this subtree.)"
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name_lower)
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~element:name_lower
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()
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else
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fect.seen_funcs <- name_lower :: fect.seen_funcs
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| [] -> ()
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end
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| _ -> ());
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+
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(* Push state for font and feComponentTransfer elements *)
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if name_lower = "font" then
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state.font_stack <- { has_missing_glyph = false } :: state.font_stack;
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if name_lower = "fecomponenttransfer" then
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state.fecomponenttransfer_stack <- { seen_funcs = [] } :: state.fecomponenttransfer_stack;
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state.element_stack <- name :: state.element_stack;
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+
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(* Check each attribute *)
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List.iter (fun (attr, value) ->
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let attr_lower = String.lowercase_ascii attr in
···
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| None -> ())
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end
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let end_element state ~name ~namespace _collector =
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let end_element state ~name ~namespace collector =
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let is_svg_element = namespace = Some svg_ns in
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if is_svg_element || state.in_svg then begin
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(* Pop from stack *)
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let name_lower = String.lowercase_ascii name in
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+
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(* Check required children when closing font element *)
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if name_lower = "font" then begin
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match state.font_stack with
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| font :: rest ->
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if not font.has_missing_glyph then begin
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(* Check if this is listed in required_children *)
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match List.assoc_opt "font" required_children with
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| Some children ->
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List.iter (fun child ->
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Message_collector.add_error collector
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~message:(Printf.sprintf
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"Element \xe2\x80\x9cfont\xe2\x80\x9d is missing required child element \xe2\x80\x9c%s\xe2\x80\x9d."
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child)
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~element:"font"
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()
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) children
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| None -> ()
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end;
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state.font_stack <- rest
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| [] -> ()
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end;
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+
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(* Pop feComponentTransfer state *)
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if name_lower = "fecomponenttransfer" then begin
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match state.fecomponenttransfer_stack with
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| _ :: rest -> state.fecomponenttransfer_stack <- rest
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| [] -> ()
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end;
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+
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(* Pop from element stack *)
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(match state.element_stack with
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| _ :: rest -> state.element_stack <- rest
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| [] -> ());
+75
-12
lib/html5_checker/specialized/xhtml_content_checker.ml
+75
-12
lib/html5_checker/specialized/xhtml_content_checker.ml
···
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3
Validates specific content model rules that the Nu validator checks,
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particularly for elements that don't allow text content or specific children. *)
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type figure_state = {
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mutable has_content_before_figcaption : bool;
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mutable has_figcaption : bool;
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mutable figcaption_at_start : bool; (* true if figcaption came first *)
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}
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+
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type state = {
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mutable element_stack : string list;
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mutable figure_stack : figure_state list; (* Stack to handle nested figures *)
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}
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let create () = { element_stack = [] }
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let create () = { element_stack = []; figure_stack = [] }
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let reset state = state.element_stack <- []
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let reset state =
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state.element_stack <- [];
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state.figure_stack <- []
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(* Elements that don't allow direct text content (only specific child elements) *)
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let no_text_elements = [
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"menu"; (* Only li elements *)
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"iframe"; (* In XHTML mode, no content allowed *)
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"figure"; (* Only figcaption and flow content, not bare text *)
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(* Note: figure handled separately due to complex content model with figcaption *)
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]
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···
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()
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| [] -> ());
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(* Handle figure content model *)
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(match state.element_stack with
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| parent :: _ when String.lowercase_ascii parent = "figure" ->
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(* We're inside a figure, check content model *)
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(match state.figure_stack with
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| fig :: _ ->
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if name_lower = "figcaption" then begin
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(* figcaption appearing *)
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if not fig.has_content_before_figcaption then
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fig.figcaption_at_start <- true;
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fig.has_figcaption <- true
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end else begin
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(* Flow content appearing in figure *)
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if fig.has_figcaption && not fig.figcaption_at_start then begin
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(* Content after figcaption that wasn't at the start = error *)
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Message_collector.add_error collector
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~message:(Printf.sprintf
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"Element \xe2\x80\x9c%s\xe2\x80\x9d not allowed as child of element \xe2\x80\x9cfigure\xe2\x80\x9d in this context. (Suppressing further errors from this subtree.)"
94
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name_lower)
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~element:name_lower
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()
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end else if not fig.has_figcaption then
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fig.has_content_before_figcaption <- true
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end
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| [] -> ())
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| _ -> ());
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+
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(* If entering a figure, push new figure state *)
104
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if name_lower = "figure" then
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state.figure_stack <- { has_content_before_figcaption = false; has_figcaption = false; figcaption_at_start = false } :: state.figure_stack;
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+
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(* Push onto stack *)
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state.element_stack <- name :: state.element_stack
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let end_element state ~name:_ ~namespace:_ _collector =
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(* Pop from stack *)
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let end_element state ~name ~namespace:_ _collector =
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let name_lower = String.lowercase_ascii name in
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(* Pop figure state if leaving a figure *)
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if name_lower = "figure" then begin
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match state.figure_stack with
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| _ :: rest -> state.figure_stack <- rest
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| [] -> ()
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end;
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(* Pop from element stack *)
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match state.element_stack with
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| _ :: rest -> state.element_stack <- rest
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| [] -> ()
···
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let parent_lower = String.lowercase_ascii parent in
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(* Only report non-whitespace text *)
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let trimmed = String.trim text in
84
-
if trimmed <> "" && not (is_text_allowed parent_lower) then
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Message_collector.add_error collector
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~message:(Printf.sprintf
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"Text not allowed in element \xe2\x80\x9c%s\xe2\x80\x9d in this context."
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parent_lower)
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~element:parent_lower
90
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()
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if trimmed <> "" then begin
132
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(* Check figure content model for text *)
133
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if parent_lower = "figure" then begin
134
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match state.figure_stack with
135
+
| fig :: _ ->
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if fig.has_figcaption && not fig.figcaption_at_start then
137
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(* Text after figcaption that wasn't at the start = error *)
138
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Message_collector.add_error collector
139
+
~message:"Text not allowed in element \xe2\x80\x9cfigure\xe2\x80\x9d in this context."
140
+
~element:"figure"
141
+
()
142
+
else if not fig.has_figcaption then
143
+
fig.has_content_before_figcaption <- true
144
+
| [] -> ()
145
+
end
146
+
else if not (is_text_allowed parent_lower) then
147
+
Message_collector.add_error collector
148
+
~message:(Printf.sprintf
149
+
"Text not allowed in element \xe2\x80\x9c%s\xe2\x80\x9d in this context."
150
+
parent_lower)
151
+
~element:parent_lower
152
+
()
153
+
end
91
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92
155
let end_document _state _collector = ()
93
156
+5
-2
test/debug_check.ml
+5
-2
test/debug_check.ml
···
1
1
let () =
2
-
let test_file = "validator/tests/xhtml/elements/menu/menu-containing-text-novalid.xhtml" in
2
+
let test_file = "validator/tests/html/attributes/lang/missing-lang-attribute-haswarn.html" in
3
3
let ic = open_in test_file in
4
4
let html = really_input_string ic (in_channel_length ic) in
5
5
close_in ic;
···
29
29
let reader2 = Bytesrw.Bytes.Reader.of_string html in
30
30
let result = Html5_checker.check ~collect_parse_errors:true ~system_id:test_file reader2 in
31
31
let errors = Html5_checker.errors result in
32
+
let warnings = Html5_checker.warnings result in
32
33
print_endline "=== Errors ===";
33
34
List.iter (fun e -> print_endline e.Html5_checker.Message.message) errors;
35
+
print_endline "\n=== Warnings ===";
36
+
List.iter (fun e -> print_endline e.Html5_checker.Message.message) warnings;
34
37
print_endline "\n=== Expected ===";
35
-
print_endline "Text not allowed in element \xe2\x80\x9cmenu\xe2\x80\x9d in this context."
38
+
print_endline "Consider adding a \xe2\x80\x9clang\xe2\x80\x9d attribute to the \xe2\x80\x9chtml\xe2\x80\x9d start tag to declare the language of this document."