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	README: optimize the unescape() function - json2tsv - JSON to TSV converter
	git clone git://git.codemadness.org/json2tsv
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	---
	commit 5c614ee9fef3c53e5c046b5fc2af19253a2899b5
	parent d0b6a90a0f4acb6b3635025c899553aad208f400
	Author: Hiltjo Posthuma <[email protected]>
	Date: Tue, 26 Oct 2021 02:17:11 +0200

	README: optimize the unescape() function

	For bigger datasets use the -F and -R option though.

	Diffstat:
	M README \| 19 ++++++-------------

	1 file changed, 6 insertions(+), 13 deletions(-)
	---
	diff --git a/README b/README
	@@ -91,19 +91,12 @@ BEGIN {
	FS = OFS = "\t";
	}
	function unescape(s) {
	- for (data = ""; (idx = index(s, "\\")); s = substr(s, idx + 2)) {
	- prev = substr(s, 1, idx - 1)
	- c = substr(s, idx + 1, 1)
	- if (c == "t")
	- data = data prev "\t"
	- else if (c == "n")
	- data = data prev "\n"
	- else if (c == "\\")
	- data = data prev "\\"
	- else
	- data = data prev # ignore other.
	- }
	- return data s # rest
	+ # use the character "\x01" as a temporary replacement for "\".
	+ gsub("\\\\\\\\", "\x01", s);
	+ gsub("\\\\n", "\n", s);
	+ gsub("\\\\t", "\t", s);
	+ gsub("\x01", "\\", s); # restore "\x01" to "\".
	+ return s;
	}
	$2 == "s" && index($3, "\\") {
	$3 = unescape($3);