Add config file finder.

editorconfig/config_file.go

@@ -0,0 +1,103 @@
+package editorconfig
+
+import (
+	"github.com/go-ini/ini"
+	"regexp"
+	"strings"
+)
+
+type ConfigFile struct {
+	Path                    string
+	DefaultRuleSet          RuleSet
+	FileConstrainedRuleSets []FileConstrainedRuleSet
+}
+
+func (cf *ConfigFile) Dir() string {
+	return GetParentDir(cf.Path)
+}
+
+func (cf *ConfigFile) IsRoot() bool {
+	return cf.DefaultRuleSet.Get("root") == "true"
+}
+
+func (cf *ConfigFile) Precedence() int {
+	return strings.Count(cf.Path, "/")
+}
+
+type Rule struct {
+	Name  string
+	Value string
+}
+
+type RuleSet []Rule
+
+func (rs *RuleSet) Add(r Rule) {
+	*rs = append(*rs, r)
+}
+
+func (rs RuleSet) Get(name string) string {
+	for i := 0; i < len(rs); i++ {
+		if rs[i].Name == name {
+			return rs[i].Value
+		}
+	}
+	return ""
+}
+
+type FileConstrainedRuleSet struct {
+	Constraint       string
+	ConstraintRegexp *regexp.Regexp
+	Rules            RuleSet
+}
+
+func CreateConfigFileStruct(path string) ConfigFile {
+	ini, err := ini.Load(path)
+	if err != nil {
+		ExitBecauseOfInternalError("Could not parse " + path)
+	}
+
+	cf := ConfigFile{}
+	cf.Path = path
+	cf.DefaultRuleSet = CreateRuleSetFromIniSectonName(ini, "")
+
+	for _, sectionName := range ini.SectionStrings() {
+		if sectionName == "DEFAULT" {
+			continue
+		}
+
+		fcrs := FileConstrainedRuleSet{
+			Constraint:       sectionName,
+			ConstraintRegexp: ConvertWildcardPatternToGoRegexp(sectionName),
+			Rules:            CreateRuleSetFromIniSectonName(ini, sectionName),
+		}
+		cf.FileConstrainedRuleSets = append(cf.FileConstrainedRuleSets, fcrs)
+	}
+
+	return cf
+}
+
+func CreateRuleSetFromIniSectonName(ini *ini.File, name string) RuleSet {
+	section, err := ini.GetSection(name)
+	if err != nil {
+		ExitBecauseOfInternalError(err.Error())
+		// return RuleSet{}
+	}
+
+	return CreateRuleSetFromIniSecton(section)
+}
+
+func CreateRuleSetFromIniSecton(section *ini.Section) RuleSet {
+	rs := RuleSet{}
+
+	for name, val := range section.KeysHash() {
+		// The spec says rule names should be case-insensitive.
+		name = strings.ToLower(name)
+
+		rs.Add(Rule{
+			Name:  name,
+			Value: val,
+		})
+	}
+
+	return rs
+}