From e47eddc4eaa0ada1ba157e34f157862cca06a8f1 Mon Sep 17 00:00:00 2001
From: Lilit0x <baasisek01@gmail.com>
Date: Thu, 7 Sep 2023 23:43:26 +0100
Subject: [PATCH] chore: datalength string function

---
 crates/gitql-ast/src/function.rs | 13 +++++++++++++
 docs/function/functions.md       |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/crates/gitql-ast/src/function.rs b/crates/gitql-ast/src/function.rs
index 48b2454d..da123b20 100644
--- a/crates/gitql-ast/src/function.rs
+++ b/crates/gitql-ast/src/function.rs
@@ -25,6 +25,7 @@ lazy_static! {
         map.insert("rtrim", text_right_trim);
         map.insert("len", text_len);
         map.insert("ascii", text_ascii);
+        map.insert("datalength", text_datalength);
         map
     };
 }
@@ -102,6 +103,13 @@ lazy_static! {
                 result: DataType::Number,
             },
         );
+        map.insert(
+            "datalength",
+            Prototype {
+                parameters: vec![DataType::Text],
+                result: DataType::Number,
+            },
+        );
         map
     };
 }
@@ -152,3 +160,8 @@ fn text_ascii(inputs: Vec<Value>) -> Value {
     }
     return Value::Number(text.chars().nth(0).unwrap() as i64);
 }
+
+fn text_datalength(inputs: Vec<Value>) -> Value {
+    let text = inputs[0].as_text();
+    return Value::Number(text.as_bytes().len() as i64);
+}
diff --git a/docs/function/functions.md b/docs/function/functions.md
index 3ebced97..eec07023 100644
--- a/docs/function/functions.md
+++ b/docs/function/functions.md
@@ -14,6 +14,7 @@ note that all functions names are case-insensitive.
 | REPLICATE | Text, Number | Text   | Return repeated a string a specified number of times.         |
 | SPACE     | Number       | Text   | Returns a string of the specified number of space characters. |
 | ASCII     | Text         | Number | Returns the ASCII value for the specific character.           |
+| DATALENGTH| Text         | Number | Returns the number of bytes used to represent an expression.  |
 
 ### String functions samples
 
@@ -25,4 +26,5 @@ SELECT * FROM commits where TRIM(name) = ""
 SELECT * FROM commits where LEN(name) > 0
 SELECT * FROM commits where name = SPACE(5)
 SELECT name, ASCII(name) AS firstCharAscii FROM commits
+SELECT DATALENGTH("AmrDeveloper") as bytelength
 ```
\ No newline at end of file