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|
package workflowpattern
import (
"fmt"
"regexp"
"strings"
)
type WorkflowPattern struct {
Pattern string
Negative bool
Regex *regexp.Regexp
}
func CompilePattern(rawpattern string) (*WorkflowPattern, error) {
negative := false
pattern := rawpattern
if strings.HasPrefix(rawpattern, "!") {
negative = true
pattern = rawpattern[1:]
}
rpattern, err := PatternToRegex(pattern)
if err != nil {
return nil, err
}
regex, err := regexp.Compile(rpattern)
if err != nil {
return nil, err
}
return &WorkflowPattern{
Pattern: pattern,
Negative: negative,
Regex: regex,
}, nil
}
//nolint:gocyclo
func PatternToRegex(pattern string) (string, error) {
var rpattern strings.Builder
rpattern.WriteString("^")
pos := 0
errors := map[int]string{}
for pos < len(pattern) {
switch pattern[pos] {
case '*':
if pos+1 < len(pattern) && pattern[pos+1] == '*' {
if pos+2 < len(pattern) && pattern[pos+2] == '/' {
rpattern.WriteString("(.+/)?")
pos += 3
} else {
rpattern.WriteString(".*")
pos += 2
}
} else {
rpattern.WriteString("[^/]*")
pos++
}
case '+', '?':
if pos > 0 {
rpattern.WriteByte(pattern[pos])
} else {
rpattern.WriteString(regexp.QuoteMeta(string([]byte{pattern[pos]})))
}
pos++
case '[':
rpattern.WriteByte(pattern[pos])
pos++
if pos < len(pattern) && pattern[pos] == ']' {
errors[pos] = "Unexpected empty brackets '[]'"
pos++
break
}
validChar := func(a, b, test byte) bool {
return test >= a && test <= b
}
startPos := pos
for pos < len(pattern) && pattern[pos] != ']' {
switch pattern[pos] {
case '-':
if pos <= startPos || pos+1 >= len(pattern) {
errors[pos] = "Invalid range"
pos++
break
}
validRange := func(a, b byte) bool {
return validChar(a, b, pattern[pos-1]) && validChar(a, b, pattern[pos+1]) && pattern[pos-1] <= pattern[pos+1]
}
if !validRange('A', 'z') && !validRange('0', '9') {
errors[pos] = "Ranges can only include a-z, A-Z, A-z, and 0-9"
pos++
break
}
rpattern.WriteString(pattern[pos : pos+2])
pos += 2
default:
if !validChar('A', 'z', pattern[pos]) && !validChar('0', '9', pattern[pos]) {
errors[pos] = "Ranges can only include a-z, A-Z and 0-9"
pos++
break
}
rpattern.WriteString(regexp.QuoteMeta(string([]byte{pattern[pos]})))
pos++
}
}
if pos >= len(pattern) || pattern[pos] != ']' {
errors[pos] = "Missing closing bracket ']' after '['"
pos++
}
rpattern.WriteString("]")
pos++
case '\\':
if pos+1 >= len(pattern) {
errors[pos] = "Missing symbol after \\"
pos++
break
}
rpattern.WriteString(regexp.QuoteMeta(string([]byte{pattern[pos+1]})))
pos += 2
default:
rpattern.WriteString(regexp.QuoteMeta(string([]byte{pattern[pos]})))
pos++
}
}
if len(errors) > 0 {
var errorMessage strings.Builder
for position, err := range errors {
if errorMessage.Len() > 0 {
errorMessage.WriteString(", ")
}
errorMessage.WriteString(fmt.Sprintf("Position: %d Error: %s", position, err))
}
return "", fmt.Errorf("invalid Pattern '%s': %s", pattern, errorMessage.String())
}
rpattern.WriteString("$")
return rpattern.String(), nil
}
func CompilePatterns(patterns ...string) ([]*WorkflowPattern, error) {
ret := []*WorkflowPattern{}
for _, pattern := range patterns {
cp, err := CompilePattern(pattern)
if err != nil {
return nil, err
}
ret = append(ret, cp)
}
return ret, nil
}
// returns true if the workflow should be skipped paths/branches
func Skip(sequence []*WorkflowPattern, input []string, traceWriter TraceWriter) bool {
if len(sequence) == 0 {
return false
}
for _, file := range input {
matched := false
for _, item := range sequence {
if item.Regex.MatchString(file) {
pattern := item.Pattern
if item.Negative {
matched = false
traceWriter.Info("%s excluded by pattern %s", file, pattern)
} else {
matched = true
traceWriter.Info("%s included by pattern %s", file, pattern)
}
}
}
if matched {
return false
}
}
return true
}
// returns true if the workflow should be skipped paths-ignore/branches-ignore
func Filter(sequence []*WorkflowPattern, input []string, traceWriter TraceWriter) bool {
if len(sequence) == 0 {
return false
}
for _, file := range input {
matched := false
for _, item := range sequence {
if item.Regex.MatchString(file) == !item.Negative {
pattern := item.Pattern
traceWriter.Info("%s ignored by pattern %s", file, pattern)
matched = true
break
}
}
if !matched {
return false
}
}
return true
}
|
