From b02bd3aaffcdf9ca017f69506140d1e5a791b9ed Mon Sep 17 00:00:00 2001
From: Gustavo Cordova Avila <Gustavo.CordovaAvila@disney.com>
Date: Mon, 25 Mar 2024 16:32:35 -0700
Subject: [PATCH] Initial commit

---
 .gitignore                    |  2 ++
 snake_case.nimble             |  9 +++++++++
 src/snake_case.nim            | 35 +++++++++++++++++++++++++++++++++++
 tests/config.nims             |  1 +
 tests/test1_toSnakeCase.nim   | 17 +++++++++++++++++
 tests/test2_fromSnakeCase.nim | 17 +++++++++++++++++
 6 files changed, 81 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 snake_case.nimble
 create mode 100644 src/snake_case.nim
 create mode 100644 tests/config.nims
 create mode 100644 tests/test1_toSnakeCase.nim
 create mode 100644 tests/test2_fromSnakeCase.nim

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bdbede7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# Ignore the binary
+snake_case
diff --git a/snake_case.nimble b/snake_case.nimble
new file mode 100644
index 0000000..80f8996
--- /dev/null
+++ b/snake_case.nimble
@@ -0,0 +1,9 @@
+# Package
+version       = "1.0.0"
+author        = "Gustavo Córdova Avila"
+description   = "Convert strings to/from SNAKE_CASE"
+license       = "Apache-2.0"
+srcDir        = "src"
+
+# Dependencies
+requires "nim >= 2.0.0"
diff --git a/src/snake_case.nim b/src/snake_case.nim
new file mode 100644
index 0000000..bd50c8f
--- /dev/null
+++ b/src/snake_case.nim
@@ -0,0 +1,35 @@
+## Convert strings to/from SNAKE_CASE
+
+proc toSnakeCase(str: string): string =
+  ## Convert a camelCase string to SNAKE_CASE
+  if str.len > 0:
+    var prv: char = '\0'
+    for ch in str:
+      if ch in {'A'..'Z'}:
+        if result.len > 0 and prv notin {'A'..'Z'}:
+          result.add '_'
+        result.add ch
+      elif ch in {'a'..'z'}:
+        result.add (ch.byte - 32).char
+      elif ch in {'0'..'9'}:
+        result.add ch
+      elif ch in {'-', '_', '.', '+'}:
+        if result.len > 0 and result[^1] != '_':
+          result.add '_'
+
+proc fromSnakeCase(str: string): string =
+  ## Convert from SNAKE_CASE to camelCase
+  var usc: bool = false
+  for ch in str:
+    if ch in {'A'..'Z'}:
+      if usc:
+        result.add ch
+        usc = false
+      else:
+        result.add (ch.byte + 32).char
+    elif ch in {'0'..'9', 'a'..'z'}:
+      result.add ch
+    elif ch in {'_', '-', '.', '+'}:
+      usc = true
+
+# Fin.
diff --git a/tests/config.nims b/tests/config.nims
new file mode 100644
index 0000000..3bb69f8
--- /dev/null
+++ b/tests/config.nims
@@ -0,0 +1 @@
+switch("path", "$projectDir/../src")
\ No newline at end of file
diff --git a/tests/test1_toSnakeCase.nim b/tests/test1_toSnakeCase.nim
new file mode 100644
index 0000000..6f3b1ce
--- /dev/null
+++ b/tests/test1_toSnakeCase.nim
@@ -0,0 +1,17 @@
+# This is just an example to get you started. You may wish to put all of your
+# tests into a single file, or separate them into multiple `test1`, `test2`
+# etc. files (better names are recommended, just make sure the name starts with
+# the letter 't').
+#
+# To run these tests, simply execute `nimble test`.
+
+import unittest
+import snake_case
+
+test "toSnakeCase":
+  check "toSnakeCase".toSnakeCase() == "TO_SNAKE_CASE"
+  check "httpServerName".toSnakeCase() == "HTTP_SERVER_NAME"
+  check "portNum".toSnakeCase() == "PORT_NUM"
+  check "firstNameOnly".toSnakeCase() == "FIRST_NAME_ONLY"
+  check "rostr.token".toSnakeCase() == "ROSTR_TOKEN"
+
diff --git a/tests/test2_fromSnakeCase.nim b/tests/test2_fromSnakeCase.nim
new file mode 100644
index 0000000..4203533
--- /dev/null
+++ b/tests/test2_fromSnakeCase.nim
@@ -0,0 +1,17 @@
+# This is just an example to get you started. You may wish to put all of your
+# tests into a single file, or separate them into multiple `test1`, `test2`
+# etc. files (better names are recommended, just make sure the name starts with
+# the letter 't').
+#
+# To run these tests, simply execute `nimble test`.
+
+import unittest
+import snake_case
+
+test "fromSnakeCase":
+  check "TO_SNAKE_CASE".fromSnakeCase() == "toSnakeCase"
+  check "HTTP_SERVER_NAME".fromSnakeCase() == "httpServerName"
+  check "PORT_NUM".fromSnakeCase() == "portNum"
+  check "FIRST_NAME_ONLY".fromSnakeCase() == "firstNameOnly"
+  check "ROSTR_TOKEN".fromSnakeCase() == "rostrToken"
+