caffeine_query_language/parser

Types

Comparator

Comparators for time slice expressions.

pub type Comparator {
  LessThan
  LessThanOrEqualTo
  GreaterThan
  GreaterThanOrEqualTo
}

Constructors

```
LessThan
```
```
LessThanOrEqualTo
```
```
GreaterThan
```
```
GreaterThanOrEqualTo
```

Exp

</>

An expression in the CQL AST, either an operator expression or a primary.

pub type Exp {
  TimeSliceExpr(spec: TimeSliceExp)
  OperatorExpr(
    numerator: Exp,
    denominator: Exp,
    operator: Operator,
  )
  Primary(primary: Primary)
}

Constructors

```
TimeSliceExpr(spec: TimeSliceExp)
```

OperatorExpr(
  numerator: Exp,
  denominator: Exp,
  operator: Operator,
)

```
Primary(primary: Primary)
```

ExpContainer

</>

Container for a parsed expression, used as the top-level parse result.

pub type ExpContainer {
  ExpContainer(exp: Exp)
}

Constructors

```
ExpContainer(exp: Exp)
```

Operator

</>

Arithmetic operators supported in CQL expressions.

pub type Operator {
  Add
  Sub
  Mul
  Div
}

Constructors

```
Add
```
```
Sub
```
```
Mul
```
```
Div
```

Primary

</>

A primary expression, either a word (identifier) or a parenthesized expression.

pub type Primary {
  PrimaryWord(word: Word)
  PrimaryExp(exp: Exp)
}

Constructors

```
PrimaryWord(word: Word)
```
```
PrimaryExp(exp: Exp)
```

Query

</>

A complete query containing a single expression.

pub type Query {
  Query(exp: Exp)
}

Constructors

```
Query(exp: Exp)
```

TimeSliceExp

</>

Time slice specification containing query, comparator, threshold, and interval.

pub type TimeSliceExp {
  TimeSliceExp(
    query: String,
    comparator: Comparator,
    threshold: Float,
    interval_seconds: Float,
  )
}

Constructors

TimeSliceExp(
  query: String,
  comparator: Comparator,
  threshold: Float,
  interval_seconds: Float,
)

Word

</>

A word (identifier) in the expression.

pub type Word {
  Word(value: String)
}

Constructors

```
Word(value: String)
```

Values

parse_expr

</>

pub fn parse_expr(input: String) -> Result(ExpContainer, String)

Parses a CQL expression string into an ExpContainer. Returns an error if the input cannot be parsed.