defparser name {rule }* => parsing-function
rule ::= normal-rule | error-rule
normal-rule ::= ((non-terminal {grammar-symbol }*) {form }*)
error-rule ::= ((non-terminal :error) {form }*)
The name of the parser.
The rules define the productions of the grammar and the associated forms define the semantic actions for the rules.
defparser
creates a parsing function of the given name for the grammar defined. The parsing function is defined as if by:
(defun <name> (lexer &optional (symbol-to-string #'identify))
The lexer parameter is a function of no arguments that returns two values: the next grammar token on the input and the associated semantic value.
The optional symbol-to-string function can be used to define a printed representation of the grammar tokens. The function should take a grammar symbol as its single argument and returns an object to be used as a print representation for the grammar token.
For a full description and examples, see the LispWorks User Guide .