Builtin functions

• type typeof(undefined);
  returns the type of an arbitrary object in lc.
• undefined dump();
  dumps all installed functions to the standard output. For debugging reasons only.
• undefined print(...);
  The print statement provides another method of output. The ... is a list of strings and expressions separated by commas. Each string or expression is printed in the order of the list. No terminating newline is printed. Strings in the print statement are printed to the output and may contain special characters. Special characters start with the backslash character (\). The special characters recognized by lc are \b (bell), \f (formfeed), \n (newline), \r (carriage return), \t (tab) and \" (double quote). Any other character following the backslash will be ignored.
• undefined home();
  moves the cursor to the upper-left corner of the screen.
• undefined clear();
  clears the screen.
• undefined setattr(string attr);
  sets the terminal font (attribute). Possible values for attr are:
  • "blink"
    Blinking font. Does not work on xterms.
  • "bold"
    Bold font.
  • "half bright"
    Half-Bright font.
  • "standout"
    Emphasized font. Works on most terminals. The kind of emphasis depends on the terminal.
  • "reverse"
    Reverse font. Black-On-White is turned to White-On-Black and vice versa.
  • "underline"
    Underlined font..
  • "normal"
    Resets all attributes to normal.
  Note that not all attributes are defined on all terminals. In any case if an attribute is not defined on a terminal then the call to setattr has no effect. Calls to setattr with other strings than the one listed above, have no effect. setattr(); can be called instead of setattr("normal");.
• undefined setcursor(string mode);
  set the font of the cursor. Possible values for mode are:
  • "standout" emphasized cursor.
  • "normal" normal cursor.
  • "off" no cursor.
  Note that not all modes are defined on all terminals. For instance, xterm defines only the normal cursor mode.
• undefined move(int row, int column);
  moves the cursor to window position (row, column). (0,0) lies at the left-top corner.
• undefined rmove(int row, int column);
  moves the cursor relative to the current position, i.e. to (current_row + row, current_column + column).
• string getch();
  reads a character for the keyboard. It does not require the press of the return key. Invisible characters are returned as strings. The following invisible characters are known:

  "RETURN" "DELETE" "BACKSPACE" "ESCAPE" "UP" "DOWN" "LEFT" "RIGHT"

  The recognition of other characters depends on the quality of the termcap entry. Control / Metacharacters get a "C-"/"M-" prefix. On terminals which do not recognize metacharacters, it is possible to simulate them by pressing ESCAPE and the corresponding character (this has to be done in less than 1 second).

• string input(string prompt);
  string input();
  reads a string from the keyboard. It prints prompt if given.
• string read(string filename);
  returns the contents of the file filename as a string.
• undefined write(string filename, string data);
  writes data to filename.