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|
package editorconfig
import (
"fmt"
"regexp"
"strconv"
"strings"
)
var (
// findLeftBrackets matches the opening left bracket {.
findLeftBrackets = regexp.MustCompile(`(^|[^\\])\{`)
// findDoubleLeftBrackets matches the duplicated opening left bracket {{.
findDoubleLeftBrackets = regexp.MustCompile(`(^|[^\\])\{\{`)
// findLeftBrackets matches the closing right bracket {.
findRightBrackets = regexp.MustCompile(`(^|[^\\])\}`)
// findDoubleRightBrackets matches the duplicated opening left bracket {{.
findDoubleRightBrackets = regexp.MustCompile(`(^|[^\\])\}\}`)
// findNumericRange matches a range of number, e.g. -2..5.
findNumericRange = regexp.MustCompile(`^([+-]?\d+)\.\.([+-]?\d+)$`)
)
// FnmatchCase tests whether the name matches the given pattern case included.
func FnmatchCase(pattern, name string) (bool, error) {
p := translate(pattern)
r, err := regexp.Compile(fmt.Sprintf("^%s$", p))
if err != nil {
return false, fmt.Errorf("error compiling %q: %w", pattern, err)
}
return r.MatchString(name), nil
}
func translate(pattern string) string { //nolint:funlen,gocognit,gocyclo,cyclop,maintidx
index := 0
pat := []rune(pattern)
length := len(pat)
result := strings.Builder{}
braceLevel := 0
isEscaped := false
inBrackets := false
// Double left and right is a hack to pass the core-test suite.
left := len(findLeftBrackets.FindAllString(pattern, -1))
doubleLeft := len(findDoubleLeftBrackets.FindAllString(pattern, -1))
right := len(findRightBrackets.FindAllString(pattern, -1))
doubleRight := len(findDoubleRightBrackets.FindAllString(pattern, -1))
matchesBraces := left+doubleLeft == right+doubleRight
pathSeparator := "/"
for index < length {
r := pat[index]
index++
switch r {
case '*':
p := index
if p < length && pat[p] == '*' {
result.WriteString(".*")
index++
} else {
result.WriteString(fmt.Sprintf("[^%s]*", pathSeparator))
}
case '/':
p := index
if p+2 < length && pat[p] == '*' && pat[p+1] == '*' && pat[p+2] == '/' {
result.WriteString(fmt.Sprintf("(?:%s|%s.*%s)", pathSeparator, pathSeparator, pathSeparator))
index += 3
} else {
result.WriteRune(r)
}
case '?':
result.WriteString(fmt.Sprintf("[^%s]", pathSeparator))
case '[':
if inBrackets { //nolint:nestif
result.WriteString("\\[")
} else {
hasSlash := false
res := strings.Builder{}
p := index
for p < length {
if pat[p] == ']' && pat[p-1] != '\\' {
break
}
res.WriteRune(pat[p])
if pat[p] == '/' && pat[p-1] != '\\' {
hasSlash = true
break
}
p++
}
if hasSlash {
result.WriteString("\\[" + res.String())
index = p + 1
} else {
if index < length && pat[index] == '!' || pat[index] == '^' {
result.WriteString("[^")
index++
} else {
result.WriteRune('[')
}
inBrackets = true
}
}
case ']':
if inBrackets && pat[index-2] == '\\' {
result.WriteString("\\]")
} else {
result.WriteRune(r)
inBrackets = false
}
case '{':
hasComma := false
p := index
res := strings.Builder{}
for p < length {
if pat[p] == '}' && pat[p-1] != '\\' {
break
}
res.WriteRune(pat[p])
if pat[p] == ',' && pat[p-1] != '\\' {
hasComma = true
break
}
p++
}
switch {
case !hasComma && p < length:
inner := res.String()
sub := findNumericRange.FindStringSubmatch(inner)
if len(sub) == 3 {
from, _ := strconv.Atoi(sub[1])
to, _ := strconv.Atoi(sub[2])
result.WriteString("(?:")
// XXX does not scale well
for i := from; i < to; i++ {
result.WriteString(strconv.Itoa(i))
result.WriteRune('|')
}
result.WriteString(strconv.Itoa(to))
result.WriteRune(')')
} else {
r := translate(inner)
result.WriteString(fmt.Sprintf("\\{%s\\}", r))
}
index = p + 1
case matchesBraces:
result.WriteString("(?:")
braceLevel++
default:
result.WriteString("\\{")
}
case '}':
if braceLevel > 0 {
if isEscaped {
result.WriteRune('}')
isEscaped = false
} else {
result.WriteRune(')')
braceLevel--
}
} else {
result.WriteString("\\}")
}
case ',':
if braceLevel == 0 || isEscaped {
result.WriteRune(r)
} else {
result.WriteRune('|')
}
default:
if r != '\\' || isEscaped {
result.WriteString(regexp.QuoteMeta(string(r)))
isEscaped = false
} else {
isEscaped = true
}
}
}
return result.String()
}
|
