r00t={HW}{!}
HW={H} {W}
H=Hello
W=World
Note=This shows the mechanics of expansion:
- Clicking on "Document" launches a parser.
- The parser looks for a line that begins "r00t=".
- It takes the right hand part (the part after the "=", e.g., "{HW}"), and treats that as the text of Document.
- It looks for any "variables" - strings of text bracketed by braces ("{" followed by a "}"). If there are any variables, it "expands" them by looking for a key with a matching name. If it finds a key that matches, it makes the substitution.
- It repeats until all variables have been substituted or been found not to have matching keys.
- In the Document view, it returns the text of Document with each substitution marked with the name of the variable (do a mouse-over) and each unmatched variable highlighted in red.
Next demo is how to include another file to access its key/values.