Improve camel case implementation

.circleci/config.yml

@@ -0,0 +1,27 @@
+version: 2.1
+orbs:
+  codecov: codecov/[email protected]
+jobs:
+  build:
+    docker:
+    - image: golang:1.13
+    working_directory: /work
+    steps:
+    - checkout
+    - run:
+        name: Install golangci-lint
+        environment:
+          GOLANGCI_LINT_VERSION: 1.21.0
+        command: |
+          wget -q https://github.com/golangci/golangci-lint/releases/download/v$GOLANGCI_LINT_VERSION/golangci-lint-$GOLANGCI_LINT_VERSION-linux-amd64.tar.gz \
+               -O /tmp/golangci-lint.tar.gz
+          tar --strip-components=1 -C $GOPATH/bin -xzf /tmp/golangci-lint.tar.gz
+          golangci-lint --version
+    - run:
+        name: Code analysis
+        command: golangci-lint run -v --config .golangci.yml ./...
+    - run:
+        name: Test
+        command: go test -mod=readonly -v -race -count=1 -cover -coverprofile=profile.cov ./...
+    - codecov/upload:
+        file: /work/profile.cov

.golangci.yml

@@ -0,0 +1,26 @@
+run:
+  deadline: 10m
+
+linters:
+  enable:
+  - dupl
+  - goconst
+  - gocyclo
+  - godox
+  - gosec
+  - interfacer
+  - lll
+  - maligned
+  - misspell
+  - prealloc
+  - stylecheck
+  - unconvert
+  - unparam
+  - errcheck
+  - golint
+  - gofmt
+  disable: []
+  fast: false
+
+issues:
+  exclude-use-default: false

README.md

@@ -1,5 +1,5 @@
-[![Build Status](https://travis-ci.org/stoewer/go-strcase.svg?branch=master)](https://travis-ci.org/stoewer/go-strcase)
-[![Coverage Status](https://coveralls.io/repos/github/stoewer/go-strcase/badge.svg?branch=master)](https://coveralls.io/github/stoewer/go-strcase?branch=master)
+[![CircleCI](https://circleci.com/gh/stoewer/go-strcase/tree/master.svg?style=svg)](https://circleci.com/gh/stoewer/go-strcase/tree/master)
+[![codecov](https://codecov.io/gh/stoewer/go-strcase/branch/master/graph/badge.svg)](https://codecov.io/gh/stoewer/go-strcase)
 [![GoDoc](https://godoc.org/github.com/stoewer/go-strcase?status.svg)](https://godoc.org/github.com/stoewer/go-strcase)
 ---
 
@@ -42,16 +42,9 @@ Dependencies
 Run linters and unit tests
 -------------------------- 
 
-Since some of the linters ran by gometalinter don't support go modules yet, test dependencies have to be
-loaded to the vendor directory first and gometalinter itself must run with disabled module support:
+To run the static code analysis, linters and tests use the following commands:
 
 ```
-go mod vendor
-GO111MODULE=off gometalinter --config=.gometalinter.json --deadline=10m .
+golangci-lint run --config .golangci.yml ./...
+go test ./...
 ```
-
-To run the test use the following commands:
-
-```
-go test .
-```

camel.go

@@ -18,20 +18,20 @@ func LowerCamelCase(s string) string {
 }
 
 func camelCase(s string, upper bool) string {
-	s = strings.TrimSpace(SnakeCase(s))
+	s = strings.TrimSpace(s)
 	buffer := make([]rune, 0, len(s))
 
-	var prev rune
-	for _, curr := range s {
+	stringIter(s, func(prev, curr, next rune) {
 		if !isDelimiter(curr) {
 			if isDelimiter(prev) || (upper && prev == 0) {
 				buffer = append(buffer, toUpper(curr))
+			} else if isLower(prev) {
+				buffer = append(buffer, curr)
 			} else {
 				buffer = append(buffer, toLower(curr))
 			}
 		}
-		prev = curr
-	}
+	})
 
 	return string(buffer)
 }

camel_test.go

@@ -15,6 +15,8 @@ func TestUpperCamelCase(t *testing.T) {
 		"f":                     "F",
 		"foo":                   "Foo",
 		"fooBar":                "FooBar",
+		"FooBarBla":             "FooBarBla",
+		"foo_barBla":            "FooBarBla",
 		" foo_bar\n":            "FooBar",
 		" foo-bar\t":            "FooBar",
 		" foo bar\r":            "FooBar",
@@ -36,6 +38,8 @@ func TestLowerCamelCase(t *testing.T) {
 		"F":                     "f",
 		"foo":                   "foo",
 		"FooBar":                "fooBar",
+		"fooBarBla":             "fooBarBla",
+		"foo_barBla":            "fooBarBla",
 		" foo_bar\n":            "fooBar",
 		" foo-bar\t":            "fooBar",
 		" foo bar\r":            "fooBar",

go.mod

@@ -1,7 +1,5 @@
 module github.com/stoewer/go-strcase
 
-require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.2.2
-)
+go 1.11
+
+require github.com/stretchr/testify v1.4.0

go.sum

@@ -1,6 +1,11 @@
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

helper.go

@@ -42,3 +42,30 @@ func isSpace(ch rune) bool {
 func isDelimiter(ch rune) bool {
 	return ch == '-' || ch == '_' || isSpace(ch)
 }
+
+// iterFunc is a callback that is called fro a specific position in a string. Its arguments are the
+// rune at the respective string position as well as the previous and the next rune. If curr is at the
+// first position of the string prev is zero. If curr is at the end of the string next is zero.
+type iterFunc func(prev, curr, next rune)
+
+// stringIter iterates over a string, invoking the callback for every single rune in the string.
+func stringIter(s string, callback iterFunc) {
+	var prev rune
+	var curr rune
+	for _, next := range s {
+		if curr == 0 {
+			prev = curr
+			curr = next
+			continue
+		}
+
+		callback(prev, curr, next)
+
+		prev = curr
+		curr = next
+	}
+
+	if len(s) > 0 {
+		callback(prev, curr, 0)
+	}
+}