The NESL Grammar

 

This appendix defines the grammar of NESL . The grammatical conventions are:

• The brackets [ ] enclose optional phrases, the symbol * \ means repeat the previous expression any number of times, and the symbol + means repeat the previous expression any number of times, but at least once.
• All symbols in typewriter font are literal tokens, all symbols in boldface are tokens with the lexical definitions given below, and all symbols in italics are variables (nonterminals) of the grammar.
• All uppercase letters can either be upper or lower case. NESL is case insensitive.