NB. This is a specification for how the syntax directed NB. editor should behave.
NB. The text is delimited by ⸢…⸣ NB. The current selection is delimited by ⸤…⸥ NB. The ¤ symbol reperesents the insertion point. NB. NB. The following fake j primitives represent nonterminals: NB. NB. J: = j sentence NB. N: = noun NB. A: = adverb NB. C: = conjunction NB. V: = verb NB. S: = assignment NB. NB. For this spec, the verb ‘t’ (for ‘text’) tests that the current NB. state of the text matches the following explicit noun. NB. The verb ‘m’ (for ‘menu’) does the same for the available NB. menu options.
NB. The initial text is always the node ⸢J:⸣. t” ⸢⸤¤J:⸥⸣ ) m” → move cursor to the right n J: ⇒ J: N: J: v J: ⇒ J: V: J: g J: ⇒ J: I: =: J: l J: ⇒ J: I: =. J: )
NB. The cursor can be moved forward. A’→’ ⸢⸤J:¤⸥⸣ )
NB. Applying rule ‘n’ introduces a noun. A’n’ ⸢⸤N:⸥¤⸣ )
0 1 2 3 N: A: C: V: (: I: L: G: R: ‹«⇐ ⊥ a::. n::. v::. c::. A::. N::. V::. C::.