Concept

Mary (programming language)

Résumé
Mary is a programming language designed and implemented by RUNIT at Trondheim, Norway in the 1970s. It borrowed many features from ALGOL 68 but was designed for systems programming (machine-oriented programming). An unusual feature of its syntax was that expressions were constructed using the conventional infix operators, but all of them had the same precedence and evaluation went from left to right unless there were brackets. Assignment had the destination on the right and assignment was considered just another operator. Similar to C, several language features appear to have existed to allow producing reasonably well optimised code, despite a quite primitive code generator in the compiler. These included operators similar to the += et alter in C and explicit register declarations for variables. Notable features:
  • Dataflow syntax – values flow from left to right, including assignment
  • Most constructs could be used in expressions: blocks, IF, CASE, etc.
  • Text-based recursive macro
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