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heuristics regexp engine configurable #3, adapt IsVendor optimization & tests

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Regex collation optimization for IsVendor now fails gracefully.
Tests that are affected by non-RE2 syntax are explicitly marked.
This commit is contained in:
Alex Bezzubov
2023-02-16 17:55:57 +01:00
parent 8df9e1ecf2
commit 8246efecce
4 changed files with 79 additions and 76 deletions
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32
internal/code-generator/generator/vendor.go
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@ -41,34 +41,14 @@ func Vendor(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string)
}
func executeVendorTemplate(out io.Writer, regexps []string, tmplPath, tmplName, commit string) error {
funcs := template.FuncMap{"optimize": collateAllMatchers}
funcs := template.FuncMap{"collateAllRegexps": collateAllRegexps}
return executeTemplate(out, tmplName, tmplPath, commit, funcs, regexps)
}
func collateAllMatchers(regexps []string) string {
// We now collate all regexps from VendorMatchers to a single large regexp
// collateAllRegexps all regexps to a single large regexp.
func collateAllRegexps(regexps []string) string {
// which is at least twice as fast to test than simply iterating & matching.
//
// ---
//
// We could test each matcher from VendorMatchers in turn i.e.
//
// func IsVendor(filename string) bool {
// for _, matcher := range data.VendorMatchers {
// if matcher.MatchString(filename) {
// return true
// }
// }
// return false
// }
//
// Or naïvely concatentate all these regexps using groups i.e.
//
// `(regexp1)|(regexp2)|(regexp3)|...`
//
// However, both of these are relatively slow and don't take advantage
// of the inherent structure within our regexps.
//
// Imperical observation: by looking at the regexps, we only have 3 types.
// 1. Those that start with `^`
// 2. Those that start with `(^|/)`
@ -88,12 +68,9 @@ func collateAllMatchers(regexps []string) string {
sort.Strings(regexps)
// Check prefix, group expressions
var caretPrefixed, caretOrSlashPrefixed, theRest []string
// Check prefix, add to the respective group slices
for _, re := range regexps {
if !isRE2(re) {
continue
}
if strings.HasPrefix(re, caret) {
caretPrefixed = append(caretPrefixed, re[len(caret):])
} else if strings.HasPrefix(re, caretOrSlash) {
@ -102,6 +79,7 @@ func collateAllMatchers(regexps []string) string {
theRest = append(theRest, re)
}
}
var sb strings.Builder
appendGroupWithCommonPrefix(&sb, "^", caretPrefixed)
sb.WriteString("|")