pratt

Even if you have alternatives, there are still situations in which you might want to use a Pratt parser.

It's why you can take Pratt and Whitney engines off a 767 and put on GE or Rolls Royce engines.

There is no way of expressing this directly in a BNF-style grammar, but it is trivial with a Pratt parser.

You could check a port of a Pratt parser done by Crockford some years back, can save you a bit of hassle.

Things stalled out there after Raibert left and Gil Pratt took over.

I've actually implemented a Pratt parser in the past but I thought it was just for parsing operators with precedence?

So basically, asking GE or Pratt & Whitney to fit modern turbofan engines upfront for free, and getting paid out of the fuel and/or maintenance savings over time?

> I've actually implemented a Pratt parser in the past but I thought it was just for parsing operators with precedence?

Relevant technology: (1) There was a unit of Pratt and Whitney in Florida that considered such jet engine problems and had a bright idea: At Mach 2.5+ or so, don't really need the turbojet compressor.

For anyone with a passing interest in the integrity of journalism, the J-2x rocket engine for which the A-3 Test Stand was built to test was let on a $1.2 billion dollar contract to Pratt & Whittney RocketDyne.

Well, at Lockheed, Kelly Johnson considered the Pratt and Whitney engine and titanium and designed and built a few dozen of the the SR-71s; Ike got his pictures; and no SR-71 was lost to enemy action.

I can't remember what politician it was, but they were one of the big pushers of closing down GE's alternative engine program, which was convenient since they were from Connecticut where Pratt & Whitney is located (If I remember correctly).

This was due to the "turbojet-assisted ramjet" design of the Pratt and Whitney J-58.

The article title refers to a "plane engine" not a "plane." There is a huge difference: the passenger plane airframes everyone knows and flies on are made by totally separate companies (Airbus, Boeing) from the engines (Rolls Royce, GE, Pratt & Whitney).

Alternatively, they can do what some colleagues of mine did back in the late '90s, with a similar concept (a "web talent incubator" named Populi) -- they worked with accredited institutions like Pratt to build and monitor their curricula, giving them the imprimatur of a prestigious institution without the regulatory handcuffs.

There are many interesting algorithms that are usually analyzed in an imperative setting, like in-place quicksort, Knuth-Morris-Pratt, or Gaussian elimination.

For example, there is a very efficient implementation of such an approach (pure PEG+Pratt, no memoisation and no backtracking) in Nemerle.

There are parser generators based on PEG and Pratt, which are very flexible and efficient.