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GNU GENERAL PUBLIC LICENSE |
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Version 3, 29 June 2007 |
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Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> |
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Everyone is permitted to copy and distribute verbatim copies |
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of this license document, but changing it is not allowed. |
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Preamble |
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The GNU General Public License is a free, copyleft license for |
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software and other kinds of works. |
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The licenses for most software and other practical works are designed |
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to take away your freedom to share and change the works. By contrast, |
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the GNU General Public License is intended to guarantee your freedom to |
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share and change all versions of a program--to make sure it remains free |
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software for all its users. We, the Free Software Foundation, use the |
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GNU General Public License for most of our software; it applies also to |
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any other work released this way by its authors. You can apply it to |
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your programs, too. |
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When we speak of free software, we are referring to freedom, not |
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To protect your rights, we need to prevent others from denying you |
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For example, if you distribute copies of such a program, whether |
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Developers that use the GNU GPL protect your rights with two steps: |
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0. Definitions. |
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"This License" refers to version 3 of the GNU General Public License. |
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You may not propagate or modify a covered work except as expressly |
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You are not required to accept this License in order to receive or |
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nothing other than this License grants you permission to propagate or |
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Each time you convey a covered work, the recipient automatically |
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by this License, of making, using, or selling its contributor version, |
||||
but do not include claims that would be infringed only as a |
||||
consequence of further modification of the contributor version. For |
||||
purposes of this definition, "control" includes the right to grant |
||||
patent sublicenses in a manner consistent with the requirements of |
||||
this License. |
||||
|
||||
Each contributor grants you a non-exclusive, worldwide, royalty-free |
||||
patent license under the contributor's essential patent claims, to |
||||
make, use, sell, offer for sale, import and otherwise run, modify and |
||||
propagate the contents of its contributor version. |
||||
|
||||
In the following three paragraphs, a "patent license" is any express |
||||
agreement or commitment, however denominated, not to enforce a patent |
||||
(such as an express permission to practice a patent or covenant not to |
||||
sue for patent infringement). To "grant" such a patent license to a |
||||
party means to make such an agreement or commitment not to enforce a |
||||
patent against the party. |
||||
|
||||
If you convey a covered work, knowingly relying on a patent license, |
||||
and the Corresponding Source of the work is not available for anyone |
||||
to copy, free of charge and under the terms of this License, through a |
||||
publicly available network server or other readily accessible means, |
||||
then you must either (1) cause the Corresponding Source to be so |
||||
available, or (2) arrange to deprive yourself of the benefit of the |
||||
patent license for this particular work, or (3) arrange, in a manner |
||||
consistent with the requirements of this License, to extend the patent |
||||
license to downstream recipients. "Knowingly relying" means you have |
||||
actual knowledge that, but for the patent license, your conveying the |
||||
covered work in a country, or your recipient's use of the covered work |
||||
in a country, would infringe one or more identifiable patents in that |
||||
country that you have reason to believe are valid. |
||||
|
||||
If, pursuant to or in connection with a single transaction or |
||||
arrangement, you convey, or propagate by procuring conveyance of, a |
||||
covered work, and grant a patent license to some of the parties |
||||
receiving the covered work authorizing them to use, propagate, modify |
||||
or convey a specific copy of the covered work, then the patent license |
||||
you grant is automatically extended to all recipients of the covered |
||||
work and works based on it. |
||||
|
||||
A patent license is "discriminatory" if it does not include within |
||||
the scope of its coverage, prohibits the exercise of, or is |
||||
conditioned on the non-exercise of one or more of the rights that are |
||||
specifically granted under this License. You may not convey a covered |
||||
work if you are a party to an arrangement with a third party that is |
||||
in the business of distributing software, under which you make payment |
||||
to the third party based on the extent of your activity of conveying |
||||
the work, and under which the third party grants, to any of the |
||||
parties who would receive the covered work from you, a discriminatory |
||||
patent license (a) in connection with copies of the covered work |
||||
conveyed by you (or copies made from those copies), or (b) primarily |
||||
for and in connection with specific products or compilations that |
||||
contain the covered work, unless you entered into that arrangement, |
||||
or that patent license was granted, prior to 28 March 2007. |
||||
|
||||
Nothing in this License shall be construed as excluding or limiting |
||||
any implied license or other defenses to infringement that may |
||||
otherwise be available to you under applicable patent law. |
||||
|
||||
12. No Surrender of Others' Freedom. |
||||
|
||||
If conditions are imposed on you (whether by court order, agreement or |
||||
otherwise) that contradict the conditions of this License, they do not |
||||
excuse you from the conditions of this License. If you cannot convey a |
||||
covered work so as to satisfy simultaneously your obligations under this |
||||
License and any other pertinent obligations, then as a consequence you may |
||||
not convey it at all. For example, if you agree to terms that obligate you |
||||
to collect a royalty for further conveying from those to whom you convey |
||||
the Program, the only way you could satisfy both those terms and this |
||||
License would be to refrain entirely from conveying the Program. |
||||
|
||||
13. Use with the GNU Affero General Public License. |
||||
|
||||
Notwithstanding any other provision of this License, you have |
||||
permission to link or combine any covered work with a work licensed |
||||
under version 3 of the GNU Affero General Public License into a single |
||||
combined work, and to convey the resulting work. The terms of this |
||||
License will continue to apply to the part which is the covered work, |
||||
but the special requirements of the GNU Affero General Public License, |
||||
section 13, concerning interaction through a network will apply to the |
||||
combination as such. |
||||
|
||||
14. Revised Versions of this License. |
||||
|
||||
The Free Software Foundation may publish revised and/or new versions of |
||||
the GNU General Public License from time to time. Such new versions will |
||||
be similar in spirit to the present version, but may differ in detail to |
||||
address new problems or concerns. |
||||
|
||||
Each version is given a distinguishing version number. If the |
||||
Program specifies that a certain numbered version of the GNU General |
||||
Public License "or any later version" applies to it, you have the |
||||
option of following the terms and conditions either of that numbered |
||||
version or of any later version published by the Free Software |
||||
Foundation. If the Program does not specify a version number of the |
||||
GNU General Public License, you may choose any version ever published |
||||
by the Free Software Foundation. |
||||
|
||||
If the Program specifies that a proxy can decide which future |
||||
versions of the GNU General Public License can be used, that proxy's |
||||
public statement of acceptance of a version permanently authorizes you |
||||
to choose that version for the Program. |
||||
|
||||
Later license versions may give you additional or different |
||||
permissions. However, no additional obligations are imposed on any |
||||
author or copyright holder as a result of your choosing to follow a |
||||
later version. |
||||
|
||||
15. Disclaimer of Warranty. |
||||
|
||||
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY |
||||
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT |
||||
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY |
||||
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, |
||||
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
||||
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM |
||||
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF |
||||
ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
||||
|
||||
16. Limitation of Liability. |
||||
|
||||
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS |
||||
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
||||
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE |
||||
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF |
||||
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD |
||||
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), |
||||
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF |
||||
SUCH DAMAGES. |
||||
|
||||
17. Interpretation of Sections 15 and 16. |
||||
|
||||
If the disclaimer of warranty and limitation of liability provided |
||||
above cannot be given local legal effect according to their terms, |
||||
reviewing courts shall apply local law that most closely approximates |
||||
an absolute waiver of all civil liability in connection with the |
||||
Program, unless a warranty or assumption of liability accompanies a |
||||
copy of the Program in return for a fee. |
||||
|
||||
END OF TERMS AND CONDITIONS |
||||
|
||||
How to Apply These Terms to Your New Programs |
||||
|
||||
If you develop a new program, and you want it to be of the greatest |
||||
possible use to the public, the best way to achieve this is to make it |
||||
free software which everyone can redistribute and change under these terms. |
||||
|
||||
To do so, attach the following notices to the program. It is safest |
||||
to attach them to the start of each source file to most effectively |
||||
state the exclusion of warranty; and each file should have at least |
||||
the "copyright" line and a pointer to where the full notice is found. |
||||
|
||||
<one line to give the program's name and a brief idea of what it does.> |
||||
Copyright (C) <year> <name of author> |
||||
|
||||
This program is free software: you can redistribute it and/or modify |
||||
it under the terms of the GNU General Public License as published by |
||||
the Free Software Foundation, either version 3 of the License, or |
||||
(at your option) any later version. |
||||
|
||||
This program is distributed in the hope that it will be useful, |
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||||
GNU General Public License for more details. |
||||
|
||||
You should have received a copy of the GNU General Public License |
||||
along with this program. If not, see <http://www.gnu.org/licenses/>. |
||||
|
||||
Also add information on how to contact you by electronic and paper mail. |
||||
|
||||
If the program does terminal interaction, make it output a short |
||||
notice like this when it starts in an interactive mode: |
||||
|
||||
<program> Copyright (C) <year> <name of author> |
||||
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. |
||||
This is free software, and you are welcome to redistribute it |
||||
under certain conditions; type `show c' for details. |
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate |
||||
parts of the General Public License. Of course, your program's commands |
||||
might be different; for a GUI interface, you would use an "about box". |
||||
|
||||
You should also get your employer (if you work as a programmer) or school, |
||||
if any, to sign a "copyright disclaimer" for the program, if necessary. |
||||
For more information on this, and how to apply and follow the GNU GPL, see |
||||
<http://www.gnu.org/licenses/>. |
||||
|
||||
The GNU General Public License does not permit incorporating your program |
||||
into proprietary programs. If your program is a subroutine library, you |
||||
may consider it more useful to permit linking proprietary applications with |
||||
the library. If this is what you want to do, use the GNU Lesser General |
||||
Public License instead of this License. But first, please read |
||||
<http://www.gnu.org/philosophy/why-not-lgpl.html>. |
||||
@ -1,227 +0,0 @@ |
||||
|
||||
-------------------------------------------------------------------------- |
||||
March 24, 2009 Version 1.71 |
||||
|
||||
m i m e T e X R e a d m e F i l e |
||||
(including pre-compiled Linux binary mimetex.cgi -- see NOTE below) |
||||
|
||||
Copyright(c) 2002-2009, John Forkosh Associates, Inc. All rights reserved. |
||||
-------------------------------------------------------------------------- |
||||
|
||||
by: John Forkosh |
||||
john@forkosh.com www.forkosh.com |
||||
|
||||
This file is part of mimeTeX, which is free software. |
||||
You may redistribute and/or modify it under the terms |
||||
of the GNU General Public License, version 2 or later, |
||||
as published by the Free Software Foundation. See |
||||
http://www.gnu.org/licenses/gpl.html |
||||
|
||||
------------------------------------------------------------- |
||||
NOTE for Linux users... |
||||
------------------------------------------------------------- |
||||
This zip file contains pre-compiled binary image mimetex.cgi, |
||||
compiled under Debian GNU/Linux running kernel 2.4.32, with gcc |
||||
3.3.5. It also contains all mimetex source files. The compile |
||||
command was |
||||
gcc -static -DAA mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
------------------------------------------------------------- |
||||
|
||||
MimeTeX is discussed and illustrated online at |
||||
its homepage |
||||
http://www.forkosh.com/mimetex.html |
||||
Or you can follow the Quick Start instructions below |
||||
(or the more detailed instructions in Section III) |
||||
to immediately install mimeTeX on your own machine. |
||||
Then point your browser to |
||||
http://www.yourdomain.com/mimetex.html |
||||
for a demo/tutorial and reference. |
||||
Installation problems? Point your browser to |
||||
mimeTeX's homepage |
||||
http://www.forkosh.com/mimetex.html |
||||
then click its "full mimeTeX manual" link and see |
||||
Section II. |
||||
|
||||
|
||||
I. QUICK START |
||||
------------------------------------------------------------------------ |
||||
To compile and install mimeTeX |
||||
* unzip mimetex.zip in any convenient working directory |
||||
* to produce an executable that emits anti-aliased |
||||
gif images (recommended) |
||||
cc -DAA mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
-or- for gif images without anti-aliasing |
||||
cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
-or- to produce an executable that emits mime xbitmaps |
||||
cc -DXBITMAP mimetex.c -lm -o mimetex.cgi |
||||
(For Windows, see "Compile Notes" in Section III below.) |
||||
* mv mimetex.cgi to your server's cgi-bin/ directory |
||||
* mv mimetex.html to your server's htdocs/ directory |
||||
* if the relative path from htdocs to cgi-bin isn't |
||||
../cgi-bin then edit mimetex.html and change the |
||||
few dozen occurrences as necessary. |
||||
Then, to quickly learn more about mimeTeX |
||||
* point your browser to www.yourdomain.com/mimetex.html |
||||
Any problems with the above? |
||||
* read the more detailed instructions below, |
||||
or see http://www.forkosh.com/mimetex.html |
||||
|
||||
|
||||
II. INTRODUCTION |
||||
------------------------------------------------------------------------ |
||||
MimeTeX, licensed under the gpl, lets you easily embed LaTeX math in |
||||
your html pages. It parses a LaTeX math expression and immediately |
||||
emits the corresponding gif image, rather than the usual TeX dvi. |
||||
And mimeTeX is an entirely separate little program that doesn't |
||||
use TeX or its fonts in any way. It's just one cgi that you put in |
||||
your site's cgi-bin/ directory, with no other dependencies. |
||||
So mimeTeX is very easy to install. And it's equally easy to use. |
||||
Just place an html <img> tag in your document wherever you want to |
||||
see the corresponding LaTeX expression. For example, |
||||
<img src="../cgi-bin/mimetex.cgi?f(x)=\int_{-\infty}^x~e^{-t^2}dt" |
||||
border=0 align=absmiddle> |
||||
generates and displays the corresponding gif image on-the-fly, |
||||
wherever you put that <img> tag. MimeTeX doesn't need intermediate |
||||
dvi-to-gif conversion, and it doesn't clutter your filesystem with |
||||
separate little gif files for each converted expression. (Optional |
||||
image caching does store gif files, and subsequently reads them as |
||||
needed, rather than re-rendering the same images every time a page |
||||
is reloaded.) |
||||
|
||||
|
||||
III. COMPILATION AND INSTALLATION |
||||
------------------------------------------------------------------------ |
||||
I've built and run mimeTeX under Linux and NetBSD using gcc. |
||||
The source code is ansi-standard C, and should compile |
||||
and execute under all environments without any change whatsoever. |
||||
Build instructions below are for Unix. Modify them as necessary |
||||
for your particular situation. Note the -DWINDOWS switch if |
||||
applicable. |
||||
|
||||
Unzip mimetex.zip in any convenient working directory. |
||||
Your working directory should now contain |
||||
mimetex.zip your gnu zipped mimeTeX distribution containing... |
||||
README this file (see mimetex.html for demo/tutorial) |
||||
LICENSE GPL license, under which you may use mimeTeX |
||||
mimetex.c mimeTeX source program and all required functions |
||||
mimetex.h header file for mimetex.c (and for gfuntype.c) |
||||
gfuntype.c parses output from gftype -i and writes bitmap data |
||||
texfonts.h output from several gfuntype runs, needed by mimetex.c |
||||
gifsave.c gif library by Sverre H. Huseby <sverrehu@online.no> |
||||
mimetex.html sample html document, mimeTeX demo and tutorial |
||||
Note: all files in mimetex.zip use Unix line termination, |
||||
i.e., linefeeds (without carriage returns) signal line endings. |
||||
Conversion for Windows, Macs, VMS, etc, can usually be accomplished |
||||
with unzip's -a option, i.e., unzip -a mimetex.zip |
||||
|
||||
Now, to compile a mimeTeX executable that emits anti-aliased gif |
||||
images (recommended for most uses), type the command |
||||
cc -DAA mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
|
||||
Or, for an executable that emits gif images without |
||||
anti-aliasing, |
||||
cc -DGIF mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
|
||||
Alternatively, to compile a mimeTeX executable that emits |
||||
mime xbitmaps, just type the command |
||||
cc -DXBITMAP mimetex.c -lm -o mimetex.cgi |
||||
|
||||
Compile Notes: |
||||
* If (and only if) you're compiling a Windows executable |
||||
with the -DAA or -DGIF option (but not -DXBITMAP), then |
||||
add -DWINDOWS also. For example, |
||||
cc -DAA -DWINDOWS mimetex.c gifsave.c -lm -o mimetex.cgi |
||||
The above Unix-like syntax works with MinGW (http://www.mingw.org) |
||||
and djgpp (http://www.delorie.com/djgpp/) Windows compilers, but |
||||
probably not with most others, where it's only intended as a |
||||
"template". |
||||
* Several additional command-line options that you may find |
||||
useful are discussed in Section IId (href="#options") |
||||
of your mimetex.html page. |
||||
|
||||
That's all there is to building mimeTeX. You can now test your |
||||
mimetex.cgi executable from the Unix command line by typing, e.g., |
||||
./mimetex.cgi "x^2+y^2" |
||||
which should emit two ascii rasters something like the following |
||||
Ascii dump of bitmap image... Hex dump of colormap indexes... |
||||
........**..................**.. .......1**1................1**1. |
||||
.......*..*.....*..........*..*. .......*23*.....*..........*23*. |
||||
..........*.....*.............*. ..........*.....*.............*. |
||||
.***......*.....*....**.*.....*. .***1....2*.....*....**3*....2*. |
||||
.**.*....*......*....**.*....*.. .**.*...1*......*....**.*...1*.. |
||||
..*.....*.*..******...*.*...*.*. ..*....2*.*..******...*.*..2*.*. |
||||
**.*...****.....*....*.*...****. **.*...****.....*....*.*2..****. |
||||
****............*.....**........ ****............*....1**........ |
||||
................*......*........ ................*......*........ |
||||
................*....**......... ................*....**1........ |
||||
The 5 colormap indexes denote rgb... |
||||
.-->255 1-->196 2-->186 3-->177 *-->0 |
||||
The right-hand illustration shows asterisks in the same positions as |
||||
the left-hand one, along with anti-aliased grayscale colormap indexes |
||||
assigned to neighboring pixels, and with the rgb value for each |
||||
index. Just typing ./mimetex.cgi without an argument should produce |
||||
ascii rasters for the default expression f(x)=x^2. If you see the |
||||
two ascii rasters then your binary's good, so mv it to your server's |
||||
cgi-bin/ directory and set permissions as necessary. |
||||
|
||||
Once mimetex.cgi is working, mv it to your server's cgi-bin/ directory |
||||
(wherever cgi programs are expected), and chmod/chown it as necessary. |
||||
Then mv mimetex.html to your server's htdocs/ directory. Now point |
||||
your browser to www.yourdomain.com/mimetex.html and you should see |
||||
your mimeTeX user's manual reference page. |
||||
|
||||
Install Notes: |
||||
* These two directories are typically of the form |
||||
somewhere/www/cgi-bin/ and somewhere/www/htdocs/ |
||||
so I set up mimtex.html to access mimetex.cgi from |
||||
the relative path ../cgi-bin/ If your directories |
||||
are non-conforming, you may have to edit the few dozen |
||||
occurrences of ../cgi-bin/mimetex.cgi in mimetex.html |
||||
Sometimes a suitable symlink works. If not, you'll |
||||
have to edit. In that case, globally changing |
||||
../cgi-bin/mimetex.cgi often works. |
||||
* Either way, once mimetex.html displays properly, you can |
||||
assume everything is working, and can begin authoring html |
||||
documents using mimetex.cgi to render your own math. |
||||
|
||||
|
||||
IV. REVISION HISTORY |
||||
------------------------------------------------------------------------ |
||||
11/30/04 J.Forkosh version 1.60 (beta) released |
||||
10/02/04 J.Forkosh version 1.50 released on CTAN with various new |
||||
features and fixes, and updated documentation. |
||||
07/18/04 J.Forkosh version 1.40 re-released on CTAN with minor |
||||
changes, e.g., \mathbb font and nested \array's |
||||
now supported. |
||||
03/21/04 J.Forkosh version 1.40 released on CTAN, with improved |
||||
LaTeX compatibility, various new features and |
||||
fixes, including fix to work under Windows. |
||||
12/21/03 J.Forkosh version 1.30 released on CTAN, with improved |
||||
LaTeX compatibility and anti-aliasing, various new |
||||
features, and thoroughly updated documentation. |
||||
10/17/03 J.Forkosh version 1.20 released on CTAN, adding picture |
||||
environment and various other changes (e.g., |
||||
more delimiters arbitrarily sized) and fixes. |
||||
07/29/03 J.Forkosh version 1.10 released on CTAN, completely replacing |
||||
mimeTeX's original built-in fonts with thinner and |
||||
more pleasing fonts, and adding one larger size. |
||||
06/27/03 J.Forkosh version 1.01 released on CTAN, adding lowpass |
||||
anti-aliasing for gifs, and http_referer checks, |
||||
and fixing a few very obscure bugs. |
||||
12/11/02 J.Forkosh version 1.00 released on CTAN, fixing \array bug |
||||
and adding various new features. |
||||
10/31/02 J.Forkosh version 0.99 released on CTAN |
||||
09/18/02 J.Forkosh internal beta test release |
||||
|
||||
|
||||
V. CONCLUDING REMARKS |
||||
------------------------------------------------------------------------ |
||||
I hope you find mimeTeX useful. If so, a contribution to your |
||||
country's TeX Users Group, or to the GNU project, is suggested, |
||||
especially if you're a company that's currently profitable. |
||||
|
||||
If you also like mimeTeX's source, I'm an independent contractor |
||||
incorporated in the US as John Forkosh Associates, Inc. A resume |
||||
is at www.forkosh.com or email john@forkosh.com |
||||
========================= END-OF-FILE README =========================== |
||||
|
||||
@ -1,6 +0,0 @@ |
||||
<html> |
||||
<head> |
||||
</head> |
||||
<body> |
||||
</body> |
||||
</html> |
||||
Binary file not shown.
Binary file not shown.
@ -1,209 +0,0 @@ |
||||
<?php |
||||
/* |
||||
Copyright 2010 Scott MacVicar |
||||
|
||||
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. |
||||
|
||||
*/ |
||||
|
||||
class OpenGraph implements Iterator |
||||
{ |
||||
/** |
||||
* There are base schema's based on type, this is just |
||||
* a map so that the schema can be obtained |
||||
* |
||||
*/ |
||||
public static $TYPES = array( |
||||
'activity' => array('activity', 'sport'), |
||||
'business' => array('bar', 'company', 'cafe', 'hotel', 'restaurant'), |
||||
'group' => array('cause', 'sports_league', 'sports_team'), |
||||
'organization' => array('band', 'government', 'non_profit', 'school', 'university'), |
||||
'person' => array('actor', 'athlete', 'author', 'director', 'musician', 'politician', 'public_figure'), |
||||
'place' => array('city', 'country', 'landmark', 'state_province'), |
||||
'product' => array('album', 'book', 'drink', 'food', 'game', 'movie', 'product', 'song', 'tv_show'), |
||||
'website' => array('blog', 'website'), |
||||
); |
||||
|
||||
/** |
||||
* Holds all the Open Graph values we've parsed from a page |
||||
* |
||||
*/ |
||||
private $_values = array(); |
||||
|
||||
/** |
||||
* Fetches a URI and parses it for Open Graph data, returns |
||||
* false on error. |
||||
* |
||||
* @param $URI URI to page to parse for Open Graph data |
||||
* @return OpenGraph |
||||
*/ |
||||
static public function fetch($URI) { |
||||
$curl = curl_init($URI); |
||||
|
||||
curl_setopt($curl, CURLOPT_FAILONERROR, true); |
||||
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true); |
||||
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); |
||||
curl_setopt($curl, CURLOPT_TIMEOUT, 15); |
||||
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false); |
||||
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); |
||||
curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); |
||||
|
||||
$response = curl_exec($curl); |
||||
|
||||
curl_close($curl); |
||||
|
||||
if (!empty($response)) { |
||||
return self::_parse($response); |
||||
} else { |
||||
return false; |
||||
} |
||||
} |
||||
|
||||
/** |
||||
* Parses HTML and extracts Open Graph data, this assumes |
||||
* the document is at least well formed. |
||||
* |
||||
* @param $HTML HTML to parse |
||||
* @return OpenGraph |
||||
*/ |
||||
static private function _parse($HTML) { |
||||
$old_libxml_error = libxml_use_internal_errors(true); |
||||
|
||||
$doc = new DOMDocument(); |
||||
$doc->loadHTML($HTML); |
||||
|
||||
libxml_use_internal_errors($old_libxml_error); |
||||
|
||||
$tags = $doc->getElementsByTagName('meta'); |
||||
if (!$tags || $tags->length === 0) { |
||||
return false; |
||||
} |
||||
|
||||
$page = new self(); |
||||
|
||||
$nonOgDescription = null; |
||||
|
||||
foreach ($tags AS $tag) { |
||||
if ($tag->hasAttribute('property') && |
||||
strpos($tag->getAttribute('property'), 'og:') === 0) { |
||||
$key = strtr(substr($tag->getAttribute('property'), 3), '-', '_'); |
||||
$page->_values[$key] = $tag->getAttribute('content'); |
||||
} |
||||
|
||||
//Added this if loop to retrieve description values from sites like the New York Times who have malformed it. |
||||
if ($tag ->hasAttribute('value') && $tag->hasAttribute('property') && |
||||
strpos($tag->getAttribute('property'), 'og:') === 0) { |
||||
$key = strtr(substr($tag->getAttribute('property'), 3), '-', '_'); |
||||
$page->_values[$key] = $tag->getAttribute('value'); |
||||
} |
||||
if ($tag->hasAttribute('name') && $tag->getAttribute('name') === 'description') { |
||||
$nonOgDescription = $tag->getAttribute('content'); |
||||
} |
||||
|
||||
} |
||||
if (!isset($page->_values['title'])) { |
||||
$titles = $doc->getElementsByTagName('title'); |
||||
if ($titles->length > 0) { |
||||
$page->_values['title'] = $titles->item(0)->textContent; |
||||
} |
||||
} |
||||
if (!isset($page->_values['description']) && $nonOgDescription) { |
||||
$page->_values['description'] = $nonOgDescription; |
||||
} |
||||
|
||||
//Fallback to use image_src if ogp::image isn't set. |
||||
if (!isset($page->values['image'])) { |
||||
$domxpath = new DOMXPath($doc); |
||||
$elements = $domxpath->query("//link[@rel='image_src']"); |
||||
|
||||
if ($elements->length > 0) { |
||||
$domattr = $elements->item(0)->attributes->getNamedItem('href'); |
||||
if ($domattr) { |
||||
$page->_values['image'] = $domattr->value; |
||||
$page->_values['image_src'] = $domattr->value; |
||||
} |
||||
} |
||||
} |
||||
|
||||
if (empty($page->_values)) { return false; } |
||||
|
||||
return $page; |
||||
} |
||||
|
||||
/** |
||||
* Helper method to access attributes directly |
||||
* Example: |
||||
* $graph->title |
||||
* |
||||
* @param $key Key to fetch from the lookup |
||||
*/ |
||||
public function __get($key) { |
||||
if (array_key_exists($key, $this->_values)) { |
||||
return $this->_values[$key]; |
||||
} |
||||
|
||||
if ($key === 'schema') { |
||||
foreach (self::$TYPES AS $schema => $types) { |
||||
if (array_search($this->_values['type'], $types)) { |
||||
return $schema; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
/** |
||||
* Return all the keys found on the page |
||||
* |
||||
* @return array |
||||
*/ |
||||
public function keys() { |
||||
return array_keys($this->_values); |
||||
} |
||||
|
||||
/** |
||||
* Helper method to check an attribute exists |
||||
* |
||||
* @param $key |
||||
*/ |
||||
public function __isset($key) { |
||||
return array_key_exists($key, $this->_values); |
||||
} |
||||
|
||||
/** |
||||
* Will return true if the page has location data embedded |
||||
* |
||||
* @return boolean Check if the page has location data |
||||
*/ |
||||
public function hasLocation() { |
||||
if (array_key_exists('latitude', $this->_values) && array_key_exists('longitude', $this->_values)) { |
||||
return true; |
||||
} |
||||
|
||||
$address_keys = array('street_address', 'locality', 'region', 'postal_code', 'country_name'); |
||||
$valid_address = true; |
||||
foreach ($address_keys AS $key) { |
||||
$valid_address = ($valid_address && array_key_exists($key, $this->_values)); |
||||
} |
||||
return $valid_address; |
||||
} |
||||
|
||||
/** |
||||
* Iterator code |
||||
*/ |
||||
private $_position = 0; |
||||
public function rewind() { reset($this->_values); $this->_position = 0; } |
||||
public function current() { return current($this->_values); } |
||||
public function key() { return key($this->_values); } |
||||
public function next() { next($this->_values); ++$this->_position; } |
||||
public function valid() { return $this->_position < sizeof($this->_values); } |
||||
} |
||||
Loading…
Reference in new issue