By Barry L. Kurtz Kenneth Slonneger
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Extra info for Formal Syntax and Semantics of Programming Languages: A Laboratory Based Approach
Our intention here is not to construct production level software but to formulate an understandable, workable, and correct language system. The Prolog code will be kept simple and easy to read, since the main purpose here is to understand the definitional techniques studied in the text. Generally, only primitive error handling is provided, so that the scanner-parser system merely fails when a program has incorrect context-free syntax. The system requests the name of a file containing a program, scans the program producing a token list, and parses it, creating an abstract syntax tree 31 32 CHAPTER 2 INTRODUCTION TO LABORATORY ACTIVITIES representing the structure of the program.
3. This Wren program has a number of errors. Classify them as contextfree, context-sensitive, or semantic. 2 THE PROGRAMMING LANGUAGE WREN 17 4. Modify the concrete syntax of Wren by adding an exponential operator ↑ whose precedence is higher than the other arithmetic operators (including unary minus) and whose associativity is right-to-left. 5. This BNF grammar defines expressions with three operations, *, -, and +, and the variables “a”, “b”, “c”, and “d”.
13: Regular Expressions The normal precedence for these regular operations is, from highest to lowest, “*” (Kleene closure or star), “•” (concatenation), and “|” (alternation), so that some pairs of parentheses may be omitted. Observe that a language over an alphabet Σ is a subset of Σ*, the set of all finite length strings of symbols from Σ. 3 VARIANTS OF BNF 19 The BNF definition of
Formal Syntax and Semantics of Programming Languages: A Laboratory Based Approach by Barry L. Kurtz Kenneth Slonneger