Chapter - Keyword Types

A keyword type is a kind of thing. object-word is a keyword type. direction-word is a keyword type. topic-word is a keyword type. parser-word is a keyword type.

A keyword emphasis is a kind of value. The plural of keyword emphasis is keyword emphases.

A keyword type has a keyword emphasis called style.

The active style is a keyword emphasis that varies.

we-are-parser-speaking is a truth state that varies. we-are-parser-speaking is false. [It's possible to have, say, an emphasized object keyword within a parser error message; this variable keeps track of whether we need to return to the parser style after switching off another keyword style.]
    
To say o:
    if object keyword highlighting is true:
        set the text style for the style of object-word;
        now the active style is the style of object-word.
    
To say t:
    if topic keyword highlighting is true:
        set the text style for the style of topic-word;
        now the active style is the style of topic-word.

To say d:
    if direction keyword highlighting is true:
        set the text style for the style of direction-word;
        now the active style is the style of direction-word.
    
To say x:
    reset styles with active style;