[nit.git] / src / highlight.nit

# This file is part of NIT ( http://www.nitlanguage.org ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Highlighting of Nit AST
module highlight

import frontend
import html
import pipeline
import astutil

# Visitor used to produce a HTML tree based on a AST on a `Source`
class HighlightVisitor
        # The root of the HTML hierarchy
        var html = new HTMLTag("span")

        # Is the HTML include a nested `<span class"{type_of_node}">` element for each `ANode` of the AST?
        # Used to have a really huge and verbose HTML (mainly for debug)
        var with_ast = false is writable

        # Prefixes used in generated IDs for line `<span>` elements.
        # Useful if more than one highlighted code is present in the same HTML document.
        #
        # If set to the empty string, id for lines are disabled.
        #
        # Is `"L"` by default.
        var line_id_prefix = "L" is writable

        # The first line to generate, null if start at the first line
        var first_line: nullable Int = null is writable

        # The last line to generate, null if finish at the last line
        var last_line: nullable Int = null is writable

        init
        do
                html.add_class("nitcode")
        end

        # The entry-point of the highlighting.
        # Will fill `html` with the generated HTML content.
        fun enter_visit(n: ANode)
        do
                n.parentize_tokens
                var s = n.location.file
                htmlize(s.first_token.as(not null), s.last_token.as(not null))
        end

        # Produce HTML between two tokens
        protected fun htmlize(first_token, last_token: Token)
        do
                var stack2 = new Array[HTMLTag]
                var stack = new Array[Prod]
                var line = 0
                var c: nullable Token = first_token
                var hv = new HighlightVisitor
                while c != null do
                        var starting

                        # Handle start of line
                        var cline = c.location.line_start
                        if cline != line then
                                # Handle starting block productions,
                                # Because c could be a detached token, get prods in
                                # the first AST token
                                var c0 = c.first_token_in_line
                                starting = null
                                if c0 != null then starting = c0.starting_prods
                                if starting != null then for p in starting do
                                        if not p.is_block then continue
                                        var tag = p.make_tag(hv)
                                        if tag == null then continue
                                        tag.add_class("foldable")
                                        var infobox = p.infobox(hv)
                                        if infobox != null then tag.attach_infobox(infobox)
                                        stack2.add(html)
                                        html.add tag
                                        html = tag
                                        stack.add(p)
                                end

                                # Add a div for the whole line
                                var tag = new HTMLTag("span")
                                var p = line_id_prefix
                                if p != "" then tag.attrs["id"] = "{p}{cline}"
                                tag.classes.add "line"
                                stack2.add(html)
                                html.add tag
                                html = tag
                                line = cline
                        end

                        # Add the blank, verbatim
                        html.add_raw_html c.blank_before

                        # Handle starting span production
                        starting = c.starting_prods
                        if starting != null then for p in starting do
                                if not p.is_span then continue
                                var tag = p.make_tag(hv)
                                if tag == null then continue
                                var infobox = p.infobox(hv)
                                if infobox != null then tag.attach_infobox(infobox)
                                stack2.add(html)
                                html.add tag
                                html = tag
                                stack.add(p)
                        end

                        # Add the token
                        if c isa TEol then 
                                html.append "\n"
                        else
                                var tag = c.make_tag(hv)
                                var pa = c.parent
                                var infobox = null
                                if c isa TId or c isa TClassid or c isa TAttrid or c isa TokenLiteral or c isa TokenOperator then
                                        assert c != null
                                        if pa != null then infobox = pa.decorate_tag(hv, tag, c)
                                else if c isa TComment and pa isa ADoc then
                                        infobox = pa.decorate_tag(hv, tag, c)
                                end
                                if infobox != null then tag.attach_infobox(infobox)
                                html.add tag
                        end

                        # Handle ending span productions
                        var ending = c.ending_prods
                        if ending != null then for p in ending do
                                if not p.is_span then continue
                                if stack.is_empty or p != stack.last then continue
                                stack.pop
                                html = stack2.pop
                        end

                        # Handle end of line and end of file
                        var n = c.next_token
                        if c == last_token then n = null
                        if n == null or n.location.line_start != line  then
                                # closes the line div
                                html = stack2.pop

                                # close the block production divs
                                var c0 = c.last_token_in_line
                                ending = null
                                if c0 != null then ending = c0.ending_prods
                                if ending != null then for p in ending do
                                        if not p.is_block then continue
                                        if stack.is_empty or p != stack.last then continue
                                        stack.pop
                                        html = stack2.pop
                                end
                        end

                        c = n
                end
                assert stack.is_empty
                assert stack2.is_empty
        end

        # Return a default CSS content related to CSS classes used in the `html` tree.
        # Could be inlined in the `.html` file of saved as a specific `.css` file.
        fun css_content: String
        do
                return """
.nitcode a { color: inherit; cursor:pointer; }
.nitcode .popupable:hover { text-decoration: underline; cursor:help; } /* underline titles */
.nitcode .foldable { display: block } /* for block productions*/
.nitcode .line{ display: block } /* for lines */
.nitcode .line:hover{ background-color: #FFFFE0; } /* current line */
.nitcode :target { background-color: #FFF3C2 } /* target highlight*/
/* lexical raw tokens. independent of usage or semantic: */
.nitcode .nc_c { color: gray; font-style: italic; } /* comment */
.nitcode .nc_d { color: #3D8127; font-style: italic; } /* documentation comments */
.nitcode .nc_k { font-weight: bold; } /* keyword */
.nitcode .nc_o {} /* operator */
.nitcode .nc_i {} /* standard identifier */
.nitcode .nc_t { color: #445588; font-weight: bold; } /* type/class identifier */
.nitcode .nc_a { color: #445588; font-style: italic; } /* old style attribute identifier */
.nitcode .nc_l { color: #009999; } /* char and number literal */
.nitcode .nc_s { color: #8F1546; } /* string literal */
/* syntactic token usage. added because of their position in the AST */
.nitcode .nc_ast { color: blue; } /* assert label */
.nitcode .nc_la { color: blue; } /* break/continue label */
.nitcode .nc_m { color: #445588; } /* module name */
/* syntactic groups */
.nitcode .nc_def { font-weight: bold; color: blue; } /* name used in a definition */
  .nitcode .nc_def.nc_a { color: blue; } /* name used in a attribute definition */
  .nitcode .nc_def.nc_t { color: blue; } /* name used in a class or vt definition */
.nitcode .nc_ss { color: #9E6BEB; } /* superstrings */
.nitcode .nc_cdef {} /* A whole class definition */
.nitcode .nc_pdef {} /* A whole property definition */
/* semantic token usage */
.nitcode .nc_v { font-style: italic; } /* local variable or parameter */
.nitcode .nc_vt { font-style: italic; } /* virtual type or formal type */

.nitcode .nc_error { border: 1px red solid;} /* not used */
.popover { max-width: 800px !important; }
"""
        end

        # Additional content to inject in the <head> tag
        # Note: does not include `css_content`; handle it yourself.
        fun head_content: String
        do
                return """<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">\n"""
        end

        # Additional content to inject just before the closing </body> tag
        fun foot_content: String
        do
                return """
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<script>$(".popupable").popover({html:true, placement:'top'})/*initialize bootstrap popover*/</script>"""
        end
end

redef class HTMLTag
        # Attach the infobox to the node by using BootStrap popover
        fun attach_infobox(infobox: HInfoBox)
        do
                classes.add("popupable")
                attrs["title"] = infobox.title
                var href = infobox.href
                if href != null then
                        attrs["data-title"] = """<a href="{{{href}}}">{{{infobox.title}}}</a>"""
                end
                attrs["data-content"] = infobox.content.write_to_string
                attrs["data-toggle"] = "popover"
        end
end


# A generic information container that can be used to decorate AST entities
class HInfoBox
        # The visitor used for contextualisation, if needed 
        var visitor: HighlightVisitor

        # A short title for the AST element
        var title: String

        # The primary link where the entity points
        # null if no link
        var href: nullable String = null

        # The content of the popuped infobox
        var content = new HTMLTag("div")

        # Append a new field in the popuped infobox
        fun new_field(title: String): HTMLTag
        do
                content.open("b").text(title)
                content.append(" ")
                var res = content.open("span")
                content.open("br")
                return res
        end

        # Append a new dropdown in the popuped content
        fun new_dropdown(title, text: String): HTMLTag
        do
                content.add_raw_html """<div class="dropdown"> <a data-toggle="dropdown" href="#"><b>"""
                content.append(title)
                content.add_raw_html "</b> "
                content.append(text)
                content.add_raw_html """<span class="caret"></span></a>"""
                var res = content.open("ul").add_class("dropdown-menu").attr("role", "menu").attr("aria-labelledby", "dLabel")
                content.add_raw_html "</div>"
                return res
        end
end

##

# Model entity or whatever that can produce an infobox
interface HInfoBoxable
        # An new infobox documenting the entity
        fun infobox(v: HighlightVisitor): HInfoBox is abstract

        # A human-readable hyper-text for the entity
        fun linkto: HTMLTag is abstract
end

redef class MDoc
        # Append an entry for the doc in the given infobox
        fun fill_infobox(res: HInfoBox)
        do
                if content.length < 2 then
                        res.new_field("doc").text(content.first)
                        return
                end
                var c = res.new_dropdown("doc", content.first)
                for x in content.iterator.skip_head(1) do
                        c.append x
                        c.add_raw_html "<br>"
                end
        end
end

redef class MEntity
        super HInfoBoxable
end

redef class MModule
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, "module {name}")
                res.href = href
                res.new_field("module").add(linkto)
                var mdoc = self.mdoc
                if mdoc != null then mdoc.fill_infobox(res)
                if in_importation.greaters.length > 1 then
                        var c = res.new_dropdown("imports", "{in_importation.greaters.length-1} modules")
                        for x in in_importation.greaters do
                                if x == self then continue
                                c.open("li").add x.linkto
                        end
                end
                return res
        end

        # The module HTML page
        fun href: String
        do
                return name + ".html"
        end

        redef fun linkto do return linkto_text(name)

        # Link to the entitiy with a specific text
        fun linkto_text(text: String): HTMLTag
        do
                return (new HTMLTag("a")).attr("href", href).text(text)
        end
end

redef class MClassDef
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, "class {mclass.name}")
                res.href = href
                if is_intro then
                        res.new_field("class").text(mclass.name)
                else
                        res.new_field("redef class").text(mclass.name)
                        res.new_field("intro").add mclass.intro.linkto_text("in {mclass.intro.mmodule.to_s}")
                end
                var mdoc = self.mdoc
                if mdoc == null then mdoc = mclass.intro.mdoc
                if mdoc != null then mdoc.fill_infobox(res)

                if in_hierarchy == null then return res

                if in_hierarchy.greaters.length > 1 then
                        var c = res.new_dropdown("hier", "super-classes")
                        for x in in_hierarchy.greaters do
                                if x == self then continue
                                if not x.is_intro then continue
                                c.open("li").add x.linkto
                        end
                end
                if in_hierarchy.smallers.length > 1 then
                        var c = res.new_dropdown("hier", "sub-classes")
                        for x in in_hierarchy.smallers do
                                if x == self then continue
                                if not x.is_intro then continue
                                c.open("li").add x.linkto
                        end
                end
                if mclass.mclassdefs.length > 1 then
                        var c = res.new_dropdown("redefs", "refinements")
                        for x in mclass.mclassdefs do
                                if x == self then continue
                                c.open("li").add x.linkto_text("in {x.mmodule}")
                        end
                end
                return res
        end

        # The class HTML page (an anchor in the module page)
        fun href: String
        do
                return mmodule.href + "#" + to_s
        end

        redef fun linkto do return linkto_text(mclass.name)

        # Link to the entitiy with a specific text
        fun linkto_text(text: String): HTMLTag
        do
                return (new HTMLTag("a")).attr("href", href).text(text)
        end
end

redef class MPropDef
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, to_s)
                res.href = href
                if self isa MMethodDef then
                        if msignature != null then res.new_field("fun").append(mproperty.name).add msignature.linkto
                else if self isa MAttributeDef then
                        if static_mtype != null then res.new_field("fun").append(mproperty.name).add static_mtype.linkto
                else if self isa MVirtualTypeDef then
                        if bound != null then res.new_field("add").append(mproperty.name).add bound.linkto
                else
                        res.new_field("wat?").append(mproperty.name)
                end

                if is_intro then
                else
                        res.new_field("intro").add mproperty.intro.linkto_text("in {mproperty.intro.mclassdef}")
                end
                var mdoc = self.mdoc
                if mdoc == null then mdoc = mproperty.intro.mdoc
                if mdoc != null then mdoc.fill_infobox(res)
                if mproperty.mpropdefs.length > 1 then
                        var c = res.new_dropdown("redef", "redefinitions")
                        for x in mproperty.mpropdefs do
                                c.open("li").add x.linkto_text("in {x.mclassdef}")
                        end
                end

                return res
        end

        # The property HTML page (an anchor in the module page)
        fun href: String
        do
                return self.mclassdef.mmodule.href + "#" + self.to_s
        end

        redef fun linkto do return linkto_text(mproperty.name)

        # Link to the entitiy with a specific text
        fun linkto_text(text: String): HTMLTag
        do
                return (new HTMLTag("a")).attr("href", href).text(text)
        end
end

redef class MClassType
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, to_s)
                res.href = mclass.intro.href
                res.new_field("class").add mclass.intro.linkto
                var mdoc = mclass.mdoc
                if mdoc == null then mdoc = mclass.intro.mdoc
                if mdoc != null then mdoc.fill_infobox(res)
                return res
        end
        redef fun linkto
        do
                return mclass.intro.linkto
        end
end
redef class MVirtualType
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, to_s)
                res.href = mproperty.intro.href
                var p = mproperty
                var pd = p.intro
                res.new_field("virtual type").add pd.linkto
                var mdoc = pd.mdoc
                if mdoc != null then mdoc.fill_infobox(res)
                return res
        end
        redef fun linkto
        do
                return mproperty.intro.linkto
        end
end
redef class MParameterType
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, to_s)
                res.new_field("parameter type").append("{name} from class ").add mclass.intro.linkto
                return res
        end
        redef fun linkto
        do
                return (new HTMLTag("span")).text(name)
        end
end

redef class MNullableType
        redef fun infobox(v)
        do
                return mtype.infobox(v)
        end
        redef fun linkto
        do
                var res = new HTMLTag("span")
                res.append("nullable ").add(mtype.linkto)
                return res
        end
end

redef class MNotNullType
        redef fun infobox(v)
        do
                return mtype.infobox(v)
        end
        redef fun linkto
        do
                var res = new HTMLTag("span")
                res.append("not null ").add(mtype.linkto)
                return res
        end
end

redef class MNullType
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, to_s)
                return res
        end
        redef fun linkto
        do
                var res = new HTMLTag("span")
                res.append("null")
                return res
        end
end

redef class MSignature
        redef fun linkto
        do
                var res = new HTMLTag("span")
                var first = true
                if not mparameters.is_empty then
                        res.append "("
                        for p in mparameters do
                                if first then
                                        first = false
                                else
                                        res.append ", "
                                end
                                res.append p.name
                                res.append ": "
                                res.add p.mtype.linkto
                        end
                        res.append ")"
                end
                var ret = return_mtype
                if ret != null then
                        res.append ": "
                        res.add ret.linkto
                end
                return res
        end
end

redef class CallSite
        super HInfoBoxable
        redef fun infobox(v)
        do
                var res = new HInfoBox(v, "call {mpropdef}")
                res.href = mpropdef.href
                res.new_field("call").add(mpropdef.linkto).add(msignature.linkto)
                if mpropdef.is_intro then
                else
                        res.new_field("intro").add mproperty.intro.linkto_text("in {mproperty.intro.mclassdef}")
                end
                var mdoc = mpropdef.mdoc
                if mdoc == null then mdoc = mproperty.intro.mdoc
                if mdoc != null then mdoc.fill_infobox(res)

                return res
        end
        redef fun linkto
        do
                return mpropdef.linkto
        end
end

redef class Variable
        super HInfoBoxable
        redef fun infobox(v)
        do
                var declared_type = self.declared_type
                if declared_type == null then
                        var res = new HInfoBox(v, "{name}")
                        res.new_field("local var").append("{name}")
                        return res
                end
                var res = new HInfoBox(v, "{name}: {declared_type}")
                res.new_field("local var").append("{name}:").add(declared_type.linkto)
                return res
        end
        redef fun linkto
        do
                return (new HTMLTag("span")).text(name)
        end
end


##

redef class ANode
        # Optionally creates a tag that encapsulate the AST element on HTML rendering
        protected fun make_tag(v: HighlightVisitor): nullable HTMLTag do return null

        # Add aditionnal information on a child-token and return an additionnal HInfoBox on it
        protected fun decorate_tag(v: HighlightVisitor, res: HTMLTag, token: Token): nullable HInfoBox
        do
                #debug("no decoration for {token.inspect}")
                #res.add_class("nc_error")
                return null
        end

        # Return a optional infobox
        fun infobox(v: HighlightVisitor): nullable HInfoBox do return null
end

redef class AStdClassdef
        redef fun make_tag(v)
        do
                var res = new HTMLTag("span")
                res.add_class("nc_cdef")
                var md = mclassdef
                if md != null then res.attr("id", md.to_s)
                return res
        end
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_def")

                var md = mclassdef
                if md == null then return null
                return md.infobox(v)
        end
end
redef class APropdef
        redef fun make_tag(v)
        do
                var res = new HTMLTag("span")
                res.add_class("nc_pdef")
                var mpd
                mpd = mpropdef
                if mpd != null then
                        #res.add(tag(mpd))
                        res.attr("id", mpd.to_s)
                end
                if self isa AAttrPropdef then
                        mpd = mreadpropdef
                        if mpd != null then res.add(tag(mpd))
                        mpd = mwritepropdef
                        if mpd != null then res.add(tag(mpd))
                end
                return res
        end

        private fun tag(mpd: MPropDef): HTMLTag
        do
                var a = new HTMLTag("a")
                a.attr("id", mpd.to_s)
                return a
        end
end

redef class Token
        # Produce an HTMLTag with the correct contents and CSS classes
        # Subclasses can redefine it to decorate the tag
        redef fun make_tag(v: HighlightVisitor): HTMLTag
        do
                var res = new HTMLTag("span")
                res.text(text)
                return res
        end
end

redef class TokenKeyword
        redef fun make_tag(v)
        do
                var res = super
                res.add_class("nc_k")
                return res
        end
end
redef class TokenOperator
        redef fun make_tag(v)
        do
                var res = super
                var p = parent
                if p != null then p.decorate_tag(v, res, self)
                res.add_class("nc_o")
                return res
        end
end

redef class AVarFormExpr
        redef fun decorate_tag(v, res, token)
        do
                var variable = self.variable
                if variable == null then return null
                res.add_class("nc_v")
                return variable.infobox(v)
        end
end

redef class AVardeclExpr
        redef fun decorate_tag(v, res, token)
        do
                var variable = self.variable
                if variable == null then return null
                res.add_class("nc_v")
                return variable.infobox(v)
        end
end

redef class AForExpr
        redef fun decorate_tag(v, res, token)
        do
                if not token isa TId then return null
                var vs = variables
                if vs == null then return null
                res.add_class("nc_v")
                var idx = n_ids.index_of(token)
                var variable = vs[idx]
                return variable.infobox(v)
        end
end

redef class AParam
        redef fun decorate_tag(v, res, token)
        do
                var mp = mparameter
                if mp == null then return null
                var variable = self.variable
                if variable == null then return null
                res.add_class("nc_v")
                return variable.infobox(v)
        end
end

redef class AAssertExpr
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_ast")
                return null
        end
end

redef class ALabel
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_la")
                return null
        end
end

redef class ASendExpr
        redef fun decorate_tag(v, res, token)
        do
                if callsite == null then return null
                return callsite.infobox(v)
        end
end

redef class ANewExpr
        redef fun decorate_tag(v, res, token)
        do
                if callsite == null then return null
                return callsite.infobox(v)
        end
end

redef class AAssignOp
        redef fun decorate_tag(v, res, token)
        do
                var p = parent
                assert p isa AReassignFormExpr

                var callsite = p.reassign_callsite
                if callsite == null then return null
                return callsite.infobox(v)
        end
end

redef class AModuleName
        redef fun decorate_tag(v, res, token)
        do
                return parent.decorate_tag(v, res, token)
        end
end

redef class AModuledecl
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_def")
                res.add_class("nc_m")
                var p = parent
                assert p isa AModule
                var mm = p.mmodule
                if mm == null then return null
                return mm.infobox(v)
        end
end

redef class AStdImport
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_m")
                var mm = mmodule
                if mm == null then return null
                return mm.infobox(v)
        end
end
redef class AAttrPropdef
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_def")
                var mpd: nullable MPropDef
                mpd = mreadpropdef
                if mpd == null then mpd = mpropdef
                if mpd == null then return null
                return mpd.infobox(v)
        end
end

redef class TId
        redef fun make_tag(v)
        do
                var res = super
                var p = parent
                if p != null then p.decorate_tag(v, res, self)
                res.add_class("nc_i")
                return res
        end
end
redef class AMethid
        redef fun make_tag(v)
        do
                var res = new HTMLTag("span")
                res.add_class("nc_def")
                return res
        end
        redef fun decorate_tag(v, res, token)
        do
                return null
                # nothing to decorate
        end
        redef fun infobox(v)
        do
                var p = parent
                if not p isa AMethPropdef then return null
                var mpd = p.mpropdef
                if mpd == null then return null
                return mpd.infobox(v)
        end
end
redef class TAttrid
        redef fun make_tag(v)
        do
                var res = super
                var p = parent
                if p != null then p.decorate_tag(v, res, self)
                res.add_class("nc_a")
                return res
        end
end
redef class AAttrFormExpr
        redef fun decorate_tag(v, res, token)
        do
                var p = mproperty
                if p == null then return null
                return p.intro.infobox(v)
        end
end
redef class TClassid
        redef fun make_tag(v)
        do
                var res = super
                var p = parent
                if p != null then p.decorate_tag(v, res, self)
                res.add_class("nc_t")
                return res
        end
end
redef class AType
        redef fun decorate_tag(v, res, token)
        do
                var mt = mtype
                if mt == null then return null
                mt = mt.undecorate
                if mt isa MFormalType then
                        res.add_class("nc_vt")
                end
                return mt.infobox(v)
        end
end
redef class AFormaldef
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_vt")
                if mtype == null then return null
                return mtype.infobox(v)
        end
end
redef class ATypePropdef
        redef fun decorate_tag(v, res, token)
        do
                res.add_class("nc_def")
                var md = mpropdef
                if md == null then return null
                return md.infobox(v)
        end
end
redef class TComment
        redef fun make_tag(v)
        do
                var res = super
                if not parent isa ADoc then
                        res.add_class("nc_c")
                end
                return res
        end
end
redef class ADoc
        redef fun make_tag(v)
        do
                var res = new HTMLTag("span")
                res.add_class("nc_d")
                return res
        end
end
redef class TokenLiteral
        redef fun make_tag(v)
        do
                var res = super
                res.add_class("nc_l")
                var p = parent
                if p != null then p.decorate_tag(v, res, self)
                return res
        end
end
redef class ASuperstringExpr
        redef fun make_tag(v)
        do
                var res = new HTMLTag("span")
                res.add_class("nc_ss")
                return res
        end
end
redef class AStringFormExpr
        redef fun decorate_tag(v, res, token)
        do
                # Workaround to tag strings
                res.classes.remove("nc_l")
                res.add_class("nc_s")
                return null
        end
end
redef class AExpr
        redef fun decorate_tag(v, res, token)
        do
                var t = mtype
                if t == null then return null
                return t.infobox(v)
        end
end