Merge pull request #35 from tbro/functions/unicode

add UNICODE funciton #13
AmrDeveloper · Sep 15, 2023 · 1d0e851 · 1d0e851
2 parents e9861ec + 783b3f2
commit 1d0e851
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diff --git a/crates/gitql-ast/src/function.rs b/crates/gitql-ast/src/function.rs
@@ -36,6 +36,7 @@ lazy_static! {
         map.insert("translate", text_translate);
         map.insert("soundex", text_soundex);
         map.insert("concat", text_concat);
+        map.insert("unicode", text_unicode);
 
         // Date functions
         map.insert("current_date", date_current_date);
@@ -189,6 +190,13 @@ lazy_static! {
                 result: DataType::Text
              },
         );
+        map.insert(
+            "unicode",
+            Prototype {
+                parameters: vec![DataType::Text],
+                result: DataType::Integer
+             },
+        );
 
         // Date functions
         map.insert(
@@ -388,6 +396,13 @@ fn text_translate(inputs: Vec<Value>) -> Value {
     return Value::Text(text);
 }
 
+fn text_unicode(inputs: Vec<Value>) -> Value {
+    if let Some(c) = inputs[0].as_text().chars().next() {
+	return Value::Integer((c as u32).into());
+    }
+    return Value::Integer(0);
+}
+
 fn text_soundex(inputs: Vec<Value>) -> Value {
     let text = inputs[0].as_text();
     if text.is_empty() {

diff --git a/docs/function/functions.md b/docs/function/functions.md
@@ -25,6 +25,8 @@ note that all functions names are case-insensitive.
 | TRANSLATE  | Text, Text, Text,          | Text   | Returns the string from the first argument after the characters specified in the second argument are translated into the characters specified in the third argument. |
 | SOUNDEX    | Text                       | Text   | Returns a four-character code to evaluate the similarity of two expressions. |
 | CONCAT     | Text, Text                 | Text   | Adds two or more strings together.                                          |
+| UNICODE    | Text                       | Number | Return an integer value (the Unicode value), for the first character of the input expression.                                                                        |
+
 ### String functions samples
 
 ```sql
@@ -45,6 +47,7 @@ SELECT RIGHT("AmrDeveloper", 3) AS extract
 SELECT TRANSLATE("Amr[Dev]{eloper}", "[]{}", "()()")
 SELECT SOUNDEX("AmrDeveloper") as code
 SELECT CONCAT("amrdeveloper", ".github.io")
+SELECT UNICODE("AmrDeveloper")
 ```
 
 ### Date functions