Created
October 13, 2017 01:52
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Read command parameter (argument or option) from generator
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| function* getopt(argv) { | |
| let cache = null | |
| // ignore execution program & script filename by call to .slice() function. | |
| for (let node of argv.slice(2)) { | |
| const match = /^--([a-z][0-9a-z-]*)(?:=(.*))?$/i.exec(node) | |
| // hanlde cache first... | |
| if (cache) { | |
| // yield previous option with TRUE (no value matched) or current argument. | |
| const value = match ? true : node | |
| yield { | |
| name: cache, | |
| isArgument: false, | |
| value: value | |
| } | |
| cache = null | |
| // discard argument if assigned to previous option... | |
| if (match == null) { | |
| continue | |
| } | |
| } | |
| // save & continue if this option doesn't matched a value. | |
| if (match && !match[2]) { | |
| cache = match[1] | |
| continue | |
| } | |
| const mismatch = (match == null) | |
| yield { | |
| name: mismatch ? undefined : match[1], | |
| isArgument: mismatch, | |
| value: mismatch ? node : match[2] | |
| } | |
| } | |
| // handle last option without value | |
| if (cache) { | |
| yield { | |
| name: cache, | |
| isArgument: false, | |
| value: true | |
| } | |
| } | |
| } |
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