Modules of the Elan Programming Environment

The modules of the Elan Programming Environment are:

• The monitor, acting as a command interpreter, provides most of the user interface and invokes all other modules.
• The translator accepts input of definitions, translates them to internal form and stores them into memory.
• The lister provides a structured overview of the defined names and their definitions.
• The editor takes care of all text input, for example when entering or editing a definition.
• The checker performs the checking of some static properties of the program prior to its execution.
• The executor executes checked programs.

The relationship between these modules is displayed in the following figure:

(315,180) (000,170)modules (155,150)(70,20) (120,150) (070,010)monitor (140,140)(-2,-1)20 (150,140)(-1,-1)20 (160,140)(1,-1)20 (170,140)(2,-1)20 (035,100)(70,20) (000,100) (070,010)editor (055,090)(0,-1)20 (115,100)(70,20) (080,100) (070,010)lister (080,100)(-1,0)10 (195,100)(70,20) (160,100) (070,010)checker (215,090)(0,-1)20 (075,060)(70,20) (040,060) (070,010)translator (110,060)(1,0)10 (235,060)(70,20) (200,060) (070,010)executor (255,050)(0,-1)20 (155,060)(70,20)[t] (120,060)(0,-1)50 (190,060)(0,-1)50 (155,010)(70,20)[b] (120,060) (070,010)memory (135,070)(0,1)20 (175,070)(0,1)20 (145,045) (1,-1)030 (155,035) (-1,-1)020 (145,025) (1,-1)010 (020,025) (070,010)program (055,030)(0,1)20 (220,025) (070,010)results