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Merged
ashyanSpada merged 3 commits into from
Apr 9, 2026
Merged

Extend expression engine with built-in functions, new operators, and Value::map() #62

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7201f65
Initial plan
Copilot Apr 8, 2026
bd25ccb
feat: add built-in functions, Value::map(), and new infix operators
Copilot Apr 8, 2026
f49427e
fix: apply rustfmt formatting to fix CI cargo fmt check
Copilot Apr 9, 2026
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53 changes: 51 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -153,8 +153,11 @@ A binary expression contains two operands separated by an operator. All the bina
| * | 120 | |
| % | 120 | |
| / | 120 | |
| beginWith | 200 | |
| endWith | 200 | |
| beginWith | 200 | Returns true if the left string starts with the right string |
| endWith | 200 | Returns true if the left string ends with the right string |
| in | 200 | Returns true if the left value is found in the right list |
| notIn | 200 | Returns true if the left value is not found in the right list |
| contains | 200 | Returns true if the left string contains the right string |

### TernaryExpression

Expand Down Expand Up @@ -236,3 +239,49 @@ NoneExpression:
```

The return value of the NoneExpression is `None`.

## Built-in Functions

The following functions are available without any registration:

### Math Functions

| Function | Signature | Description |
| -------------- | ------------------ | --------------------------------------------------- |
| min | min(x, ...) | Returns the minimum value among all numeric params |
| max | max(x, ...) | Returns the maximum value among all numeric params |
| sum | sum(x, ...) | Returns the sum of all numeric params |
| mul | mul(x, ...) | Returns the product of all numeric params |
| avg | avg(x, ...) | Returns the average of all numeric params |
| abs | abs(x) | Returns the absolute value of x |
| floor | floor(x) | Rounds x down to the nearest integer |
| ceil | ceil(x) | Rounds x up to the nearest integer |
| round | round(x) | Rounds x to the nearest integer |
| pow | pow(base, exp) | Returns base raised to the power exp |
| sqrt | sqrt(x) | Returns the square root of x |

### String Functions

| Function | Signature | Description |
| -------------- | ------------------ | --------------------------------------------------- |
| len | len(x) | Returns the length of a string, list, or map |
| upper | upper(s) | Converts string s to uppercase |
| lower | lower(s) | Converts string s to lowercase |
| trim | trim(s) | Removes leading and trailing whitespace from s |
| concat | concat(s, ...) | Concatenates all string params |
| str | str(x) | Converts a value to its string representation |
| num | num(x) | Converts a string or bool to a number |

### List Functions

| Function | Signature | Description |
| -------------- | ------------------ | --------------------------------------------------- |
| first | first(list) | Returns the first element of the list |
| last | last(list) | Returns the last element of the list |

### Map Functions

| Function | Signature | Description |
| -------------- | ------------------ | --------------------------------------------------- |
| keys | keys(map) | Returns a list of all keys in the map |
| values | values(map) | Returns a list of all values in the map |
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