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tdop.github.io's Introduction

This repo exists to host a remastered copy of Vaughan Pratt's original 1973 paper, Top Down Operator Precedence, which describes his profoundly beautiful parsing algorithm.

A PDF copy of the original paper was freely available from hall.org.ua, but it went offline sometime around 2017. The repo includes an archived copy (see original.pdf), which we were able to obtain via the Wayback Machine.

Remastered by Carl Smith, Brian Campbell, David Majda, Corentin Smith, Brett Handley, Kauê Rodrigues, Paul Sokolovsky and Andreas Björkman.

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tdop.github.io's Issues

Include a link to the original paper

It would be great to include a link to the original paper on the website so it’s easier to compare the remastering with the original (e.g. when suspecting a transcription error).

The original can be found e.g. here.

Link offline and Single quoted phrase transcription problems

The link to the original paper is offline, but can be found on the wayback machine at archive.org.

The original paper has:

We write ‘a’ to mean the expression a whose value is a itself, as distinct from the value of a, e.g. '1+1' must be evaluated twice to yield 2.

But the remastering does not distinguish between a and 'a' causing confusion.

Indeed the single quotes may have been stripped from the text looking at the theorem prover section.

Btw, great work!

PDF?

A PDF copy of the original paper was freely available from hall.org.ua, but it recently went offline. Thankfully, it can still be accessed through to the Wayback Machine.

Okay. Why not put the PDF in this repo?

Small typo

<p>An obvious choice of delimiters is commas. However, this is not as valuable as a syntactic token that documents the role of the argument following it. For example, <code>if a then b else c</code> is more readable (by a human) then <code>if a, b, c</code>. Other examples are <code>print x format f</code>, <code>i from s to f by d while c do b</code>, <code>log x base b</code>, <code>solve e using m</code>, <code>x between y and z</code>, etc.</p>

if a then b else c is more readable (by a human) then if a, b, c

should probably be:

if a then b else c is more readable (by a human) than if a, b, c

A smaller typo

... Cases which did not have a unique answer would he referred back to the programmer,

Should be:

... Cases which did not have a unique answer would be referred back to the programmer,

Include a GitHub link

It would be nice to include a link to the GiHub repo (e.g. in the footer of the website). This would make it slightly more convenient to report issues or suggest fixes.

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