SINCLAIR BASIC SOFTWARE

-We use semantic versioning for this grammar (). -Other models of the ZX Spectrum have more commands, that are not included // in this grammar. -Unlike the original ZX BASIC, LIST and INKEY$ are not allowed to use '#' // (stream redirection). OPEN# and CLOSE# are allowed, but only for dealing with // the ROM standard channels, i.e., with syntax 'OPEN# number,string' and // 'CLOSE# number'. -External devices are needed for the ZX ROM to recognize these commands, // but if the devices are connected, they can provide their own syntax, // thus they are not included in the grammar: CAT, FORMAT, MOVE, ERASE. Unlike in the original BASIC after tokenized, this grammar accepts // empty lines (only the line number). ZX SPECTRUM BASIC - ORIGINAL 48 SINCLAIR BASIC (FOR ZX 16K/48K ZX SPECTRUM) // LL(1) Grammar v2.1.2 by (c) Juan-Antonio Fernandez-Madrigal, 2021 // // NOTES: // -Capitalized keywords: terminals non-capitalized keywords: non-terminals // -Like in the original BASIC, this grammar accepts empty statements (e.g., // '10 ::'. It does not follow the syntax of Bison or any other parser generator, but it should be straightforward to adapt. The format of the file is very simple: plain ASCII text with capitalized terminals and lower-case non-terminals. It has also served as the core for the ZX-Basicus utility to synthetize and analyze ZX Spectrum BASIC programs. In some of the most modern programs, it has served to detect deviations from the Sinclair BASIC, such as the use of special commands used by BASIC compilers. Unlike many other BASIC dialects, Sinclair Basic did not include the ELSE operator in the IFTHEN clause. Joje buvo raytas Sinclair BASIC interpretatorius, redaktorius ir operacin sistema. This grammar has been tested successfully with many programs of the 80s but also with programs taken from the BASIC Jam 2017 contest, some of the Spanish 'bytemaniacos' contests, and several books preserved at proyectoBasicZX. The ROM contained the Sinclair BASIC programming language, editor, and operating system. Neither should be difficult to add, anyway. The grammar covers the language for the mentioned models except the part concerning external devices (Microdrive, etc.), since they can provide varying syntax for the corresponding statements, nor the additional statements available in more modern models (e.g., AY sound in 128K).

SINCLAIR BASIC SOFTWARE

This is another item in the software related to the ZX Spectrum that I have developed over the years. A LL(1) grammar is not the best in terms of structural efficiency of the generated ASTs ( LALR grammars are better), but it excels in terms of simplicity of parser execution. Here you can find the text of a working LL(1) grammar that is able to parse the Sinclair BASIC used in the original ZX Spectrum 16K/48K.

Sinclair basic