rex/doc/design/Target Execution Flow.txt

# Logic Tree for Rex Task Execution

    Rex - A configuration management and workflow automation system that
    compiles and runs in minimal environments.

    © SILO GROUP and Chris Punches, 2020.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

## Key:
-Actions are labled by indices in a zero-indexed array 'a'.
-Decisions are labeled by indices in a zero-indexed array 'd'.
	-Decisions have two possible states, TRUE or FALSE (0 or 1 respectively).
	-Decision determinations are labeled with the decision label and a subspecifier.

## Diagram:

a[0] Execute Target
d[0] Error Code Check
	d[0].0 ZERO
		a[1] NEXT
	d[0].1 NON-ZERO
		d[1] Rectify Check
				d[1].0 FALSE
					d[2] Required Check
						d[2].0 FALSE
							a[2] NEXT
						d[2].1 TRUE
							a[3] EXCEPTION
				d[1].1 TRUE
					a[4] Execute Rectifier
					d[3] Error Code Check
						d[3].1 NON-ZERO
							d[4] Required Check
								d[4].0 FALSE
									a[5] NEXT
								d[4].1 TRUE
									a[6] EXCEPTION
						d[3].0 ZERO
							a[7] Re-Execute Target
							d[5] Error Code Check
								d[5].0 ZERO
									a[8] NEXT
								d[5].1 NON-ZERO
									d[6] Required Check
										d[6].0 FALSE
											a[9] NEXT
										d[6].1 TRUE
											a[10] EXCEPTION