From ca249e1c5db94f1294515edbb12c177c21d60800 Mon Sep 17 00:00:00 2001
From: xin-huang <xinhuang.res@gmail.com>
Date: Wed, 17 Apr 2024 00:22:27 +0200
Subject: [PATCH] Refactor parsers

---
 dadi_cli/parsers/argument_validation.py | 87 +++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 dadi_cli/parsers/argument_validation.py

diff --git a/dadi_cli/parsers/argument_validation.py b/dadi_cli/parsers/argument_validation.py
new file mode 100644
index 00000000..3ad8dfe9
--- /dev/null
+++ b/dadi_cli/parsers/argument_validation.py
@@ -0,0 +1,87 @@
+import argparse, os
+
+
+def positive_int(value: str) -> int:
+    """
+    Validates if the provided string represents a positive integer.
+
+    Parameters
+    ----------
+    value : str
+        The value to validate.
+
+    Returns
+    -------
+    int
+        The validated positive integer.
+
+    Raises
+    ------
+    argparse.ArgumentTypeError
+        If the value is not a valid integer or positive integer.
+
+    """
+    if value is not None:
+        try:
+            ivalue = int(value)
+        except ValueError:
+            raise argparse.ArgumentTypeError(f"{value} is not a valid integer")
+        if ivalue <= 0:
+            raise argparse.ArgumentTypeError(f"{value} is not a positive integer")
+    return ivalue
+
+
+def positive_number(value: str) -> float:
+    """
+    Validates if the provided string represents a positive number.
+
+    Parameters
+    ----------
+    value : str
+        The value to validate.
+
+    Returns
+    -------
+    float
+        The validated positive number.
+
+    Raises
+    ------
+    argparse.ArgumentTypeError
+        If the value is not a valid number or positive number.
+
+    """
+    if value is not None:
+        try:
+            fvalue = float(value)
+        except ValueError:
+            raise argparse.ArgumentTypeError(f"{value} is not a valid number")
+        if fvalue <= 0:
+            raise argparse.ArgumentTypeError(f"{value} is not a positive number")
+    return fvalue
+
+
+def existed_file(value: str) -> str:
+    """
+    Validates if the provided string is a path to an existing file.
+
+    Parameters
+    ----------
+    value : str
+        The path to validate.
+
+    Returns
+    -------
+    str
+        The validated file path.
+
+    Raises
+    ------
+    argparse.ArgumentTypeError
+        If the file does not exist.
+
+    """
+    if value is not None:
+        if not os.path.isfile(value):
+            raise argparse.ArgumentTypeError(f"{value} is not found")
+    return value