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use binary search for keywords instead of hardcoded

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jsquery_scan.l

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+45

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`‎jsquery_scan.l`

Lines changed: 45 additions & 16 deletions

Original file line number	Diff line number	Diff line change
`@@ -183,27 +183,56 @@ yyerror(const char *message)`
`183`	`183`	`}`
`184`	`184`	`}`
`185`	`185`
	`186`	`+typedefstructkeyword`
	`187`	`+{`
	`188`	`+int16len;`
	`189`	`+boollowercase;`
	`190`	`+intval;`
	`191`	`+char*keyword;`
	`192`	`+} keyword;`
	`193`	`+`
	`194`	`+static keyword keywords[] = {`
	`195`	`+{2,false,IN_P,"in" },`
	`196`	`+{4,true,NULL_P,"null"},`
	`197`	`+{4,true,TRUE_P,"true"},`
	`198`	`+{5,true,FALSE_P,"false"}`
	`199`	`+};`
	`200`	`+`
`186`	`201`	`staticint`
`187`	`202`	`checkSpecialVal()`
`188`	`203`	`{`
`189`		`-int res = STRING_P;`
	`204`	`+int res = STRING_P;`
	`205`	`+intdiff;`
	`206`	`+keyword*StopLow = keywords,`
	`207`	`+*StopHigh = keywords +lengthof(keywords),`
	`208`	`+*StopMiddle;`
`190`	`209`
`191`		`-if (scanstring.len ==2)`
`192`		`-{`
`193`		`-if (pg_strncasecmp("in", scanstring.val, scanstring.len) ==0)`
`194`		`-return IN_P;`
`195`		`-}`
`196`		`-elseif (scanstring.len ==4)`
`197`		`-{`
`198`		`-if (strncmp("null", scanstring.val, scanstring.len) ==0)`
`199`		`-res = NULL_P;`
`200`		`-elseif (strncmp("true", scanstring.val, scanstring.len) ==0)`
`201`		`-res = TRUE_P;`
`202`		`-}`
`203`		`-elseif (scanstring.len ==5)`
	`210`	`+if (scanstring.len > keywords[lengthof(keywords) -1].len)`
	`211`	`+return res;`
	`212`	`+`
	`213`	`+while(StopLow < StopHigh)`
`204`	`214`	`{`
`205`		`-if (strncmp("false", scanstring.val, scanstring.len) ==0)`
`206`		`-res = FALSE_P;`
	`215`	`+StopMiddle = StopLow + (StopHigh - StopLow) /2;`
	`216`	`+`
	`217`	`+if (StopMiddle->len == scanstring.len)`
	`218`	`+diff =pg_strncasecmp(StopMiddle->keyword, scanstring.val, scanstring.len);`
	`219`	`+else`
	`220`	`+diff = StopMiddle->len - scanstring.len;`
	`221`	`+`
	`222`	`+if (diff <0)`
	`223`	`+StopLow = StopMiddle +1;`
	`224`	`+elseif (diff >0)`
	`225`	`+StopHigh = StopMiddle;`
	`226`	`+else`
	`227`	`+{`
	`228`	`+if (StopMiddle->lowercase)`
	`229`	`+diff =strncmp(StopMiddle->keyword, scanstring.val, scanstring.len);`
	`230`	`+`
	`231`	`+if (diff ==0)`
	`232`	`+res = StopMiddle->val;`
	`233`	`+`
	`234`	`+break;`
	`235`	`+}`
`207`	`236`	`}`
`208`	`237`
`209`	`238`	`return res;`

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`‎jsquery_scan.l`

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