Add full file checker CheckEndOfLineRule.

editorconfig/full_file_checkers.go

@@ -0,0 +1,61 @@
+package editorconfig
+
+import (
+	"regexp"
+	"strings"
+)
+
+var fullFileCheckers = map[string]FullFileChecker{
+	"end_of_line": CheckEndOfLineRule,
+}
+
+type FullFileChecker func(ruleValue string, fileContent string) *FullFileCheckResult
+
+// @todo - add fixers to each instance of FullFileCheckResult.
+type FullFileCheckResult struct {
+	isOk           bool
+	messageIfNotOk string
+}
+
+var lfRegexp = regexp.MustCompile(`\n`)
+var crRegexp = regexp.MustCompile(`\r`)
+var crlfRegexp = regexp.MustCompile(`\r\n`)
+
+func CheckEndOfLineRule(ruleValue string, fileContent string) *FullFileCheckResult {
+	// Valid rules values are "lf", "cr", or "crlf". The values are case insensitive.
+	ruleValueLowercase := strings.ToLower(ruleValue)
+
+	if ruleValueLowercase != "lf" && ruleValueLowercase != "cr" && ruleValueLowercase != "crlf" {
+		return &FullFileCheckResult{isOk: false, messageIfNotOk: "end_of_line value is not valid: " + ruleValue}
+	}
+
+	if ruleValueLowercase == "lf" {
+		if crlfRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use LF for new lines but contains CRLF"}
+		}
+		if crRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use LF for new lines but contains CR"}
+		}
+	}
+
+	if ruleValueLowercase == "cr" {
+		if crlfRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use CR for new lines but contains CRLF"}
+		}
+		if lfRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use CR for new lines but contains LF"}
+		}
+	}
+
+	if ruleValueLowercase == "crlf" {
+		fileContent := crlfRegexp.ReplaceAllString(fileContent, "")
+		if lfRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use CRLF for new lines but contains LF"}
+		}
+		if crRegexp.MatchString(fileContent) {
+			return &FullFileCheckResult{isOk: false, messageIfNotOk: "should use CRLF for new lines but contains CR"}
+		}
+	}
+
+	return &FullFileCheckResult{isOk: true}
+}