forked from lix-project/lix
convert table to subsections
this form is much easier to maintain (also with minimal diffs), and allows for more details on each operator. this change a purely mechanical transformation, without changing any contents.
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Valentin Gagarin
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# Operators
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The table below lists the operators in the Nix language, in
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order of precedence (from strongest to weakest binding).
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## Select
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> *e* `.` *attrpath* \[ `or` *def* \]
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Select attribute denoted by the attribute path *attrpath* from set *e*. (An attribute path is a dot-separated list of attribute names.) If the attribute doesn’t exist, return *def* if provided, otherwise abort evaluation.
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Associativity: none
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Precedence: 1
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## Application
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> *e1* *e2*
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Call function *e1* with argument *e2*.
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Associativity: left
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Precedence: 2
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## Arithmetic Negation
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> `-` *e*
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Arithmetic negation.
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Associativity: none
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Precedence: 3
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## Has Attribute
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> *e* `?` *attrpath*
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Test whether set *e* contains the attribute denoted by *attrpath*; return `true` or `false`.
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Associativity: none
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Precedence: 4
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## List Concatenation
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> *e1* `++` *e2*
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List concatenation.
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Associativity: right
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Precedence: 5
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## Multiplication
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> *e1* `*` *e2*,
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Arithmetic multiplication.
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Associativity: left
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Precedence: 6
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## Division
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> *e1* `/` *e2*
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Arithmetic division.
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Associativity: left
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Precedence: 6
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## Addition
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> *e1* `+` *e2*
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Arithmetic addition.
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Associativity: left
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Precedence: 7
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## Subtraction
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> *e1* `-` *e2*
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Arithmetic subtraction.
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Associativity: left
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Precedence: 7
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## String Concatenation
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> *string1* `+` *string2*
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String concatenation.
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Associativity: left
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Precedence: 7
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## Not
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> `!` *e*
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Boolean negation.
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Associativity: none
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Precedence: 8
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## Update
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> *e1* `//` *e2*
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Return a set consisting of the attributes in *e1* and *e2* (with the latter taking precedence over the former in case of equally named attributes).
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Associativity: right
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Precedence: 9
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## Less Than
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> *e1* `<` *e2*,
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Arithmetic/lexicographic comparison.
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Associativity: none
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Precedence: 10
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## Less Than or Equal To
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> *e1* `<=` *e2*
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Arithmetic/lexicographic comparison.
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Associativity: none
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Precedence: 10
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## Greater Than
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> *e1* `>` *e2*
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Arithmetic/lexicographic comparison.
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Associativity: none
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Precedence: 10
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## Greater Than or Equal To
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> *e1* `>=` *e2*
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Arithmetic/lexicographic comparison.
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Associativity: none
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Precedence: 10
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## Equality
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> *e1* `==` *e2*
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Equality.
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Associativity: none
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Precedence: 11
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## Inequality
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> *e1* `!=` *e2*
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Inequality.
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Associativity: none
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Precedence: 11
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## Logical AND
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> *e1* `&&` *e2*
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Logical AND.
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Associativity: left
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Precedence: 12
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## Logical OR
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> *e1* <code>||</code> *e2*
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Logical OR.
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Associativity: left
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Precedence: 13
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## Logical Implication
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> *e1* `->` *e2*
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Logical implication (equivalent to <code>!e1 || e2</code>).
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Associativity: none
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Precedence: 14
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| Name | Syntax | Description | Associativity | Precedence |
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| ------------------------ | ----------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- | ---------- |
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| Select | *e* `.` *attrpath* \[ `or` *def* \] | Select attribute denoted by the attribute path *attrpath* from set *e*. (An attribute path is a dot-separated list of attribute names.) If the attribute doesn’t exist, return *def* if provided, otherwise abort evaluation. | none | 1 |
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| Application | *e1* *e2* | Call function *e1* with argument *e2*. | left | 2 |
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| Arithmetic Negation | `-` *e* | Arithmetic negation. | none | 3 |
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| Has Attribute | *e* `?` *attrpath* | Test whether set *e* contains the attribute denoted by *attrpath*; return `true` or `false`. | none | 4 |
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| List Concatenation | *e1* `++` *e2* | List concatenation. | right | 5 |
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| Multiplication | *e1* `*` *e2*, | Arithmetic multiplication. | left | 6 |
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| Division | *e1* `/` *e2* | Arithmetic division. | left | 6 |
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| Addition | *e1* `+` *e2* | Arithmetic addition. | left | 7 |
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| Subtraction | *e1* `-` *e2* | Arithmetic subtraction. | left | 7 |
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| String Concatenation | *string1* `+` *string2* | String concatenation. | left | 7 |
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| Not | `!` *e* | Boolean negation. | none | 8 |
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| Update | *e1* `//` *e2* | Return a set consisting of the attributes in *e1* and *e2* (with the latter taking precedence over the former in case of equally named attributes). | right | 9 |
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| Less Than | *e1* `<` *e2*, | Arithmetic/lexicographic comparison. | none | 10 |
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| Less Than or Equal To | *e1* `<=` *e2* | Arithmetic/lexicographic comparison. | none | 10 |
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| Greater Than | *e1* `>` *e2* | Arithmetic/lexicographic comparison. | none | 10 |
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| Greater Than or Equal To | *e1* `>=` *e2* | Arithmetic/lexicographic comparison. | none | 10 |
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| Equality | *e1* `==` *e2* | Equality. | none | 11 |
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| Inequality | *e1* `!=` *e2* | Inequality. | none | 11 |
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| Logical AND | *e1* `&&` *e2* | Logical AND. | left | 12 |
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| Logical OR | *e1* <code>||</code> *e2* | Logical OR. | left | 13 |
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| Logical Implication | *e1* `->` *e2* | Logical implication (equivalent to <code>!e1 || e2</code>). | none | 14 |
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