Use in Education
The main article on compilers honours PL/0 for introducing several influential concepts (stepwise refinement, recursive descent parsing, EBNF, P-code, T-diagrams) to the field by educating students to use these concepts. Over the last 3 decades, most university courses on compiler construction that used PL/0 have followed Wirth strictly in employing these techniques (see references below). Some years ago university courses dared to deviate from the course set by Wirth with the replacement of the classical recursive descent parsing technique by a (nonetheless classical) Unix-like approach of employing lex and yacc. Only recently an implementation (PL/0 Language Tools) along this way has also combined modern concepts like object-orientation and design patterns with a modern scripting language (Python), allowing students to consume the source text of the implementation in a contemporary programming style.
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