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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \urllink {references <2020-02-22>}
%> \dest
\_def\_destheight{1.4em}
\_def\_destactive[#1:#2]{\_if$#2$\_else\_ifvmode
\_tmpdim=\_prevdepth \_prevdepth=-1000pt
\_destbox[#1:#2]\_prevdepth=\_tmpdim
\_else \_destbox[#1:#2]%
\_fi\_fi
}
\_def\_destbox[#1]{\_vbox to0pt{\_kern-\_destheight \_pdfdest name{#1} xyz\_vss}}
\_def\_dest[#1]{}
\_public \dest ;
%> \_link, \ilink
\_protected\_def\_linkactive[#1:#2]#3#4{\_leavevmode\_pdfstartlink height.9em depth.3em
\_pdfborder{#1} goto name{#1:#2}\_relax {#3#4}\_pdfendlink
}
\_protected\_def\_link[#1]#2#3{\_leavevmode{#3}}
\_protected\_def\_ilink[#1]#2{\_leavevmode{#2}}
\_public \ilink ;
%> \ulink
\_protected\_def\_urlactive[#1:#2]#3#4{\_leavevmode{\_escapechar=-1
\_pdfstartlink height.9em depth.3em \_pdfborder{#1}%
user{/Subtype/Link/A <</Type/Action/S/URI/URI(\_detokenize{#2})>>}\relax
{#3#4}\pdfendlink}%
}
\_def\_ulink[#1]#2{\_leavevmode{#2}}
\_def\_urlcolor{}
\_public \ulink ;
%> \_pdfborder
\_def\_pdfborder#1{\_if^#1^\_else \_isdefined{#1border}\_iftrue
\_if^\_csname#1border\_endcsname^\_else
attr{/C[\_csname#1border\_endcsname] /Border[0 0 .6]}\_fi
\_else attr{/Border[0 0 0]}\_fi\_fi
}
%> \hyperlinks
\_def\_hyperlinks#1#2{%
\_let\_dest=\_destactive \_let\_link=\_linkactive
\_def\_ilink[##1]##2{\_link[##1]{\_localcolor#1}{##2}}%
\_def\_ulink[##1]##2{\_urlactive[url:##1]{\_localcolor#2}{##2}}%
\_public \dest \ilink \ulink ;%
}
\_public \hyperlinks ;
%> \url
\_def\_url#1{{%
\_def\_tmpa{#1}\_replstring\_tmpa {\|}{}%
\_def\_tmpb{#1}\_replstring\_tmpb {\|}{\\|}%
{\_escapechar=-1 \_ea}\_ea\_edef\_ea\_tmpb\_ea{\detokenize\_ea{\_tmpb}}%
\_let\_tmpa=\_tmpb
\_replstring\_tmpb {//} {{\_urlskip\_urlslashslash\_urlbskip}}%
\_replstring\_tmpb {/} {{\_urlskip/\_urlbskip}}%
\_replstring\_tmpb {.} {{\_urlskip.\_urlbskip}}%
\_replstring\_tmpb {?} {{\_urlskip?\_urlbskip}}%
\_replstring\_tmpb {=} {{\urlskip=\urlbskip}}%
\_ea\_replstring\_ea\_tmpb \_ea{\_string &} {{\urlbskip\char`\& \urlskip}}%
\_ea\_replstring\_ea\_tmpb \_ea{\_bslash|} {{\_penalty0}}%
\_ea\_ulink \_ea[\_tmpa] {\_urlfont\_tmpb\_null}%
}}
\_def\_urlfont{\_tt}
\_def\_urlskip{\_null\_nobreak\_hskip0pt plus0.05em\_relax}
\_def\_urlbskip{\_penalty100 \_hskip0pt plus0.05em\_relax}
\_def\_urlslashslash{/\_urlskip/}
\_public \url ;
\_endcode % -------------------------------------
\%> \dest
`\dest[<type>:<label>]` creates a destination of internal links. The
destination is declared by `<type>:<label>`. If `\hyperlinks` are not
declared, then `\dest` does nothing else it is set to `\_destactive`.
The `\_destactive` is implemented by `\_pdfdest` primitive. It creates a box
in which the destination is shifted by `\_destheight`. The reason is that
the destination is exactly at top border of the PDF viewer but we want to se
the line where destination is. The destination box is positioned by
different way dependent on current vertical or horizontal mode.
\%> \_link \ilink
`\_link[<type>:<label>]{<color>}{<text>}` creates an internal link to `\dest`
with the same `<type>:<label>`. You can have more links with the same
`<type>:<label>` but only one `\dest` in the document. If `\hyperlinks` are
not declared, then `\link` only prints <text> else it is set to `\_linkactive`.
The `\_linktactive` is implemented by `\_pdfstartlink...\_pdfendlink`
primitives.
`\ilink[<type>:<label>]{<text>}` is equivalent to `\_link` but <color> is
used from `\hyperlinks` decaration.
\%> \ulink
`\ulink[<url>]{<text>}` creates external link. It only <text> by default but
the `\hyperlinks` declaration defines it as `\_urlactive[url:<url>]{<text>}`.
The external link is created by `\_pdfstartlink...\pdfendlink` primitives.
The <url> is detokenized with `\escapechar=-1` before it is used, so
`\%`, `\#` etc. can be used in the <url>.
\%> \_pdfborder
The `\_pdfstartink` primitive uses `\_pdfborder{<type>}` in its parameter
(see `\_linkactive` or `\_urlactive` macros). The `\_pdfbordef{<type>}`
expands to `attr{/C[? ? ?] /Border[0 0 .6]} if the
`\<type>border` is defined. User can define it in
order to create colored frames around active links. For example
`\def\tocborder{1 0 0}` causes red frames in TOC (not printed, only visible
in PDF viewers).
\%> \hyperlinks
`\hyperlinks{<ilink_color>}{<ulink_color>}` activates `\dest`, `\link`,
`\ilink`, `\ulink` in order they create links. These macros are redefined
here to their \"active" version.
\%> \url
`\url{<url>}` does approximately the same as `\ulink[<url>]{<url>}`, but
more work is done before the `\ulink` is processed. The link-version of <url>
is saved to `\_tmpa` and the printed version in `\_tmpb`. The printed
version is modified in order to set a breakpoints in special places of the
<url>. For example `//` is replaced by `\_urlskip/\_urlskip/\_urlbskip`
where `\urlskip` adds a small nobreakable glue between these two slashes and
before them and `\_urlbskip` adds a breakable glue after them.
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