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GLR parsing is the future

Traditionally parser generators have required that their input grammar be LALR(1) or some close variant (I would include LL(1) in this set). Back when 64k was an unimaginably large amount of memory...

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Language usage in Google’s ngram viewer

I thought I would join the fun that people are having with Google’s new ngram viewer. The raw data (only a subset for bigrams and longer ngrams) was also enticing, but at 35+ gigabytes for the...

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SQL usage: schema evolution

My first serious involvement with SQL, about 15 years ago, was writing a parser for the grammar specified in the ISO SQL-92 Standard. One of the things that surprised me about SQL was how little source...

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Learning R as a language

Books written to teach a general purpose programming language are usually organized according to the features of the language and examples often show how a particular language feature is interpreted by...

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