Precedence Functions
An operator precedence parser usually does not store the precedence table with the relations, which can get rather large. Instead, precedence functions f and g are defined. They map terminal symbols to integers, and so the precedence relations between the symbols are implemented by numerical comparison: f(a) < g(b) must hold if a <• b holds, etc.
Not every table of precedence relations has precedence functions, but in practice for most grammars such functions can be designed.
Read more about this topic: Operator-precedence Grammar
Famous quotes containing the words precedence and/or functions:
“Let not England forget her precedence of teaching nations how to live.”
—John Milton (1608–1674)
“One of the most highly valued functions of used parents these days is to be the villains of their children’s lives, the people the child blames for any shortcomings or disappointments. But if your identity comes from your parents’ failings, then you remain forever a member of the child generation, stuck and unable to move on to an adulthood in which you identify yourself in terms of what you do, not what has been done to you.”
—Frank Pittman (20th century)