Initial importv0.1.0

1 files changed, 63 insertions, 0 deletions

diff --git a/Sources/Cepis/CSV.swift b/Sources/Cepis/CSV.swift
new file mode 100644
index 0000000..064ed05
--- /dev/null
+++ b/Sources/Cepis/CSV.swift
@@ -0,0 +1,63 @@
+import Foundation
+
+enum CSV {
+    static func parse(_ text: String) -> [[String]] {
+        var rows: [[String]] = []
+        var row: [String] = []
+        var field = ""
+        var inQuotes = false
+
+        let scalars = Array(text.unicodeScalars)
+        var index = 0
+
+        while index < scalars.count {
+            let scalar = scalars[index]
+
+            if inQuotes {
+                if scalar == "\"" {
+                    if index + 1 < scalars.count && scalars[index + 1] == "\"" {
+                        field.unicodeScalars.append("\"")
+                        index += 2
+                    } else {
+                        inQuotes = false
+                        index += 1
+                    }
+                } else {
+                    field.unicodeScalars.append(scalar)
+                    index += 1
+                }
+                continue
+            }
+
+            switch scalar {
+            case "\"":
+                inQuotes = true
+                index += 1
+            case ",":
+                row.append(field)
+                field = ""
+                index += 1
+            case "\r", "\n":
+                row.append(field)
+                field = ""
+                rows.append(row)
+                row = []
+                if scalar == "\r", index + 1 < scalars.count, scalars[index + 1] == "\n" {
+                    index += 2
+                } else {
+                    index += 1
+                }
+            default:
+                field.unicodeScalars.append(scalar)
+                index += 1
+            }
+        }
+
+        if !field.isEmpty || !row.isEmpty {
+            row.append(field)
+            rows.append(row)
+        }
+
+        return rows
+    }
+}