Gold Parser Builder can also be used as a parser code generator using internal templates (FreePascal included), but there are also 3rd party engines to process compiled grammars. Gold Parser Builder can be used to create, modify and test languages in Windows IDE which can also run on Wine. This means that the same grammar can be loaded into engines made in different programming languages. Code and grammar are separated, so grammar is not tied to implementation language. It uses LALR parsing, and a mix of BNF notation, character sets and regular expressions for terminals to define language grammars. Gold is a free parsing system that you can use to develop your own programming languages, scripting languages and interpreters. You can find unfortunately abandoned Lazarus Lex and Yacc here. They are part of Free Pascal distribution. Plex and Pyacc are Pascal implementations of Lex and Yacc. Code and grammar are mixed, so grammar is tied to implementation language. BNF notation is used as a formal way to express context free grammars. Lex is a lexical analyser (token parser), and Yacc is a LALR parser generator. This is not the main compiler parser, but it is the one used for fpdoc and pas2js.įcl-xml is a FPC package that contains SAX XML and HTML parsers. FPC comes with a Pascal parser in library form in the fcl-passrc package.
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