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Merge pull request #9134 from fricklerhandwerk/syntax-admonitions
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301623f3a3
3 changed files with 22 additions and 2 deletions
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@ -2,7 +2,7 @@
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> **Syntax**
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>
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> *lookup-path* = `<` *identifier* [ `/` *identifier* `]`... `>`
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> *lookup-path* = `<` *identifier* [ `/` *identifier* ]... `>`
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A lookup path is an identifier with an optional path suffix that resolves to a [path value](@docroot@/language/values.md#type-path) if the identifier matches a search path entry.
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@ -35,6 +35,8 @@
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## Attribute selection
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> **Syntax**
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>
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> *attrset* `.` *attrpath* \[ `or` *expr* \]
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Select the attribute denoted by attribute path *attrpath* from [attribute set] *attrset*.
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@ -42,12 +44,16 @@ If the attribute doesn’t exist, return the *expr* after `or` if provided, othe
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An attribute path is a dot-separated list of [attribute names](./values.md#attribute-set).
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> **Syntax**
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>
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> *attrpath* = *name* [ `.` *name* ]...
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[Attribute selection]: #attribute-selection
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## Has attribute
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> **Syntax**
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>
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> *attrset* `?` *attrpath*
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Test whether [attribute set] *attrset* contains the attribute denoted by *attrpath*.
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@ -70,6 +76,8 @@ The `+` operator is overloaded to also work on strings and paths.
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## String concatenation
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> **Syntax**
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>
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> *string* `+` *string*
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Concatenate two [string]s and merge their string contexts.
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@ -78,6 +86,8 @@ Concatenate two [string]s and merge their string contexts.
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## Path concatenation
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> **Syntax**
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>
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> *path* `+` *path*
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Concatenate two [path]s.
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@ -87,6 +97,8 @@ The result is a path.
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## Path and string concatenation
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> **Syntax**
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>
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> *path* + *string*
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Concatenate *[path]* with *[string]*.
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@ -100,6 +112,8 @@ The result is a path.
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## String and path concatenation
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> **Syntax**
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>
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> *string* + *path*
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Concatenate *[string]* with *[path]*.
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@ -117,6 +131,8 @@ The result is a string.
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## Update
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> **Syntax**
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>
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> *attrset1* // *attrset2*
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Update [attribute set] *attrset1* with names and values from *attrset2*.
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@ -162,13 +162,17 @@ An attribute set is a collection of name-value-pairs (called *attributes*) enclo
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An attribute name can be an identifier or a [string](#string).
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An identifier must start with a letter (`a-z`, `A-Z`) or underscore (`_`), and can otherwise contain letters (`a-z`, `A-Z`), numbers (`0-9`), underscores (`_`), apostrophes (`'`), or dashes (`-`).
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> **Syntax**
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>
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> *name* = *identifier* | *string* \
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> *identifier* ~ `[a-zA-Z_][a-zA-Z0-9_'-]*`
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Names and values are separated by an equal sign (`=`).
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Each value is an arbitrary expression terminated by a semicolon (`;`).
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> *attrset* = `{` [ *name* `=` *expr* `;` `]`... `}`
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> **Syntax**
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>
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> *attrset* = `{` [ *name* `=` *expr* `;` ]... `}`
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Attributes can appear in any order.
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An attribute name may only occur once.
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