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// inline_svg.ysl2

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//

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// Produce Inline SVG element of resulting XHTML page.

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// Since stylesheet output namespace is xhtml, templates that output svg have to be explicitely declared as such 

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in xsl decl svgtmpl(match, xmlns="http://www.w3.org/2000/svg") alias template;

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in xsl decl svgfunc(name, xmlns="http://www.w3.org/2000/svg") alias template;

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// Identity template :

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//  - copy every attributes 

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//  - copy every sub-elements

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svgtmpl "@*", mode="inline_svg" xsl:copy;

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template "node()", mode="inline_svg" {

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  // use real xsl:copy instead copy-of alias from yslt.yml2

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  if "not(@id = $discardable_elements/@id)"

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      xsl:copy apply "@* | node()", mode="inline_svg";

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}

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// replaces inkscape's height and width hints. forces fit

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template "svg:svg/@width", mode="inline_svg";

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template "svg:svg/@height", mode="inline_svg";

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svgtmpl "svg:svg", mode="inline_svg" svg {

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    attrib "preserveAspectRatio" > none

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    attrib "height" > 100vh

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    attrib "width" > 100vw

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    apply "@* | node()", mode="inline_svg";

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}

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// ensure that coordinate in CSV file generated by inkscape are in default reference frame

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template "svg:svg[@viewBox!=concat('0 0 ', @width, ' ', @height)]", mode="inline_svg" {

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    error > ViewBox settings other than X=0, Y=0 and Scale=1 are not supported

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}

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// ensure that coordinate in CSV file generated by inkscape match svg default unit

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template "sodipodi:namedview[@units!='px' or @inkscape:document-units!='px']", mode="inline_svg" {

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    error > All units must be set to "px" in Inkscape's document properties

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}

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// remove i18n markers, so that defs_by_labels can find text elements

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svgtmpl "svg:text/@inkscape:label[starts-with(., '_')]", mode="inline_svg" {

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    attrib "{name()}" > «substring(., 2)»

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}

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////// Clone unlinking

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//

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// svg:use (inkscape's clones) inside a widgets are

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// replaced by real elements they refer in order to :

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//  - allow finding "needle" element in "meter" widget,

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//    even if "needle" is in a group refered by a svg use.

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//  - if "needle" is visible through a svg:use for

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//    each instance of the widget, then needle would show

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//    the same position in all instances

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//

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// For now, clone unlinkink applies to descendants of all widget except HMI:Page

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// TODO: narrow application of clone unlinking to active elements,

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//       while keeping static decoration cloned

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const "targets_not_to_unlink", "$hmi_lists/descendant-or-self::svg:*";

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const "to_unlink", "$hmi_elements[not(@id = $hmi_pages/@id)]/descendant-or-self::svg:use";

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def "func:is_unlinkable" {

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    param "targetid";

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    param "eltid";

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    result "$eltid = $to_unlink/@id and not($targetid = $targets_not_to_unlink/@id)";

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}

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svgtmpl "svg:use", mode="inline_svg"{

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    const "targetid","substring-after(@xlink:href,'#')";

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    choose {

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        when "func:is_unlinkable($targetid, @id)" {

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            call "unlink_clone" {

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                with "targetid", "$targetid";

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            }

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        }

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        otherwise xsl:copy apply "@*", mode="inline_svg";

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    }

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}

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// to unlink a clone, an group containing a copy of target element is created

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// that way, style and transforms can be preserved

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const "_excluded_use_attrs" {

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    name > href

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    name > width

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    name > height

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    name > x

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    name > y

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    name > id

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}

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const "excluded_use_attrs","exsl:node-set($_excluded_use_attrs)";

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const "_merge_use_attrs" {

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    name > transform

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    name > style

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}

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const "merge_use_attrs","exsl:node-set($_merge_use_attrs)";

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svgfunc "unlink_clone"{

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    param "targetid";

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    param "seed","''";

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    const "target", "//svg:*[@id = $targetid]";

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    const "seeded_id" choose {

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        when "string-length($seed) > 0" > «$seed»_«@id»

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        otherwise value "@id";

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    }

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    g{

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        attrib "id" value "$seeded_id";

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        attrib "original" value "@id";

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        choose {

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            when "$target[self::svg:g]" {

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                foreach "@*[not(local-name() = $excluded_use_attrs/name | $merge_use_attrs)]"

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                    attrib "{name()}" > «.»

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                if "@style | $target/@style"

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                    attrib "style" {

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                        > «@style»

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                        if "@style and $target/@style" > ;

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                        > «$target/@style»

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                    }

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                if "@transform | $target/@transform"

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                    attrib "transform" {

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                        > «@transform»

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                        if "@transform and $target/@transform" >  

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                        > «$target/@transform»

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                    }

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                apply "$target/*", mode="unlink_clone"{

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                    with "seed","$seeded_id";

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                }

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            }

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            otherwise {

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                // include non excluded attributes

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                foreach "@*[not(local-name() = $excluded_use_attrs/name)]"

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                    attrib "{name()}" > «.»

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                apply "$target", mode="unlink_clone"{

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                    with "seed","$seeded_id";

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                }

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            }

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        }

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    }

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}

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// clone unlinking is really similar to deep-copy

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// all nodes are sytematically copied

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svgtmpl "@id", mode="unlink_clone" {

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    param "seed";

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    attrib "id" > «$seed»_«.»

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    attrib "original" > «.»

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}

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svgtmpl "@*", mode="unlink_clone" xsl:copy;

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svgtmpl "svg:use", mode="unlink_clone" {

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    param "seed";

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    const "targetid","substring-after(@xlink:href,'#')";

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    choose {

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        when "func:is_unlinkable($targetid, @id)" {

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            call "unlink_clone" {

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                with "targetid", "$targetid";

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                with "seed","$seed";

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            }

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        }

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        otherwise xsl:copy apply "@*", mode="unlink_clone" {

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            with "seed","$seed";

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        }

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    }

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}

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// copying widgets would have unwanted effect

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// instead widget is refered through a svg:use.

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svgtmpl "svg:*", mode="unlink_clone" {

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    param "seed";

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    choose {

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        // node recursive copy ends when finding a widget

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        when "@id = $hmi_elements/@id" {

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            // place a clone instead of copying

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            use{

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                attrib "xlink:href" > «concat('#',@id)»

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            }

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        }

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        otherwise {

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            xsl:copy apply "@* | node()", mode="unlink_clone" {

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                with "seed","$seed";

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            }

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        }

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    }

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}

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const "result_svg" apply "/", mode="inline_svg";

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const "result_svg_ns", "exsl:node-set($result_svg)";

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emit "preamble:inline-svg" {

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    | let id = document.getElementById.bind(document);

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    | var svg_root = id("«$svg/@id»");

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}

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emit "debug:clone-unlinking" {

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    |

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    | Unlinked :

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    foreach "$to_unlink"{

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        | «@id»

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    }

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    | Not to unlink :

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    foreach "$targets_not_to_unlink"{

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        | «@id»

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    }

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}