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Add footnote markdown to 2012/hou

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Cody Boone Ferguson committed 2023-12-03 11:43:42 -08:00
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@@ -85,7 +85,7 @@ statement in [hou.c](hou.c):
``` ```
The regex engine is also algorithmically efficient. To illustrate the point, The regex engine is also algorithmically efficient. To illustrate the point,
[ansi.txt](ansi.txt) contains a pathological expression [2] that guarantees a [ansi.txt](ansi.txt) contains a pathological expression [^2] that guarantees a
hang for the competing Perl engine while matching itself. Try to compare these hang for the competing Perl engine while matching itself. Try to compare these
two engines: two engines:
@@ -119,10 +119,10 @@ beautification and preprocessing.
The second layer of obfuscation comes from the need to squeeze a reasonably The second layer of obfuscation comes from the need to squeeze a reasonably
powerful regex engine into the remaining area that isn't occupied by excessive powerful regex engine into the remaining area that isn't occupied by excessive
keywords and useless constants. To achieve this, the regex compiler is written keywords and useless constants. To achieve this, the regex compiler is written
using the same threaded virtual machine [1] that parses the regex. Due to using the same threaded virtual machine [^1] that parses the regex. Due to
compiler limitations, the generated VM code also ends up obscured by a large compiler limitations, the generated VM code also ends up obscured by a large
amount of spaghetti branches and virtual thread creations. Finally, the VM in amount of spaghetti branches and virtual thread creations. Finally, the VM in
[1] is extended to track multiple expression matches for the actual formatting. [^1] is extended to track multiple expression matches for the actual formatting.
As an extra tweak, the text message actually does something useful. Remove the As an extra tweak, the text message actually does something useful. Remove the
"Make a contract with me" catch line and the program would cease to function. "Make a contract with me" catch line and the program would cease to function.
@@ -130,9 +130,9 @@ As an extra tweak, the text message actually does something useful. Remove the
### References ### References
[1][Russ Cox, Regular Expression Matching: the Virtual Machine Approach](http://swtch.com/~rsc/regexp/regexp2.html) [^1]: [Russ Cox, Regular Expression Matching: the Virtual Machine Approach](http://swtch.com/~rsc/regexp/regexp2.html)
[2][Regular Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, PHP, Python, Ruby, ...)](http://swtch.com/~rsc/regexp/regexp1.html) [^2]: [Regular Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, PHP, Python, Ruby, ...)](http://swtch.com/~rsc/regexp/regexp1.html)
## Copyright and CC BY-SA 4.0 License: ## Copyright and CC BY-SA 4.0 License: