built-in method
phrase/3
Description
phrase(GrammarRuleBody, Input, Rest)
phrase(::GrammarRuleBody, Input, Rest)
phrase(Object::GrammarRuleBody, Input, Rest)
True when the GrammarRuleBody
grammar rule body can be applied to
the Input-Rest
difference list of tokens. In the most common case,
GrammarRuleBody
is a non-terminal defined by a grammar rule. This
built-in method is declared private and thus cannot be used as a message
to an object. When using a backend Prolog compiler supporting a
module system, calls in the format
phrase(Module:GrammarRuleBody, Input, Rest)
may also be used.
This method is opaque to cuts in the first argument. When the first argument is sufficiently instantiated at compile time, the method call is compiled in order to eliminate the implicit overheads of converting the grammar rule body into a goal and meta-calling it. For performance reasons, the second and third arguments are only type-checked at compile time.
Meta-predicate template
phrase(2, *, *)
Modes and number of proofs
phrase(+callable, ?list, ?list) - zero_or_more
Errors
GrammarRuleBody
is a variable:instantiation_error
GrammarRuleBody
is neither a variable nor a callable term:type_error(callable, GrammarRuleBody)
Examples
phrase(NonTerminal, Input, Rest)
phrase(::NonTerminal, Input, Rest)
phrase(Object::NonTerminal, Input, Rest)