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README.adoc: updated draft

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Celestino Amoroso 2024-04-09 09:11:47 +02:00
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@ -135,6 +135,9 @@ func main() {
} }
---- ----
=== Concepts and terminology
#TODO#
=== Data types === Data types
_Expr_ supports numerical, string, relational, boolean expressions, and mixed-type lists. _Expr_ supports numerical, string, relational, boolean expressions, and mixed-type lists.
@ -260,7 +263,15 @@ _Expr_ supports list of mixed-type values, also specified by normal expressions.
|=== |===
=== Variables === Variables
#TODO: variables# A variable is an identifier with an assigned value. Variables are stored in the object that implements the _ExprContext_ interface.
.Examples
[source,go]
----
a=1
x = 5.2 * (9-3)
x = 1; y = 2*x
----
=== Other operations === Other operations
@ -346,12 +357,15 @@ The table below shows all supported operators by decreasing priorities.
.2+|*AND*| [blue]`and` | _Infix_ | _and_ | _boolean_ "and" _boolean_ -> _boolean_ .2+|*AND*| [blue]`and` | _Infix_ | _and_ | _boolean_ "and" _boolean_ -> _boolean_
| [blue]`&&` | _Infix_ | _and_ | _boolean_ "&&" _boolean_ -> _boolean_ | [blue]`&&` | _Infix_ | _and_ | _boolean_ "&&" _boolean_ -> _boolean_
.2+|*OR*| [blue]`or` | _Infix_ | _or_ | _boolean_ "or" _boolean_ -> _boolean_ .2+|*OR*| [blue]`or` | _Infix_ | _or_ | _boolean_ "or" _boolean_ -> _boolean_
| [blue]`||` | _Infix_ | _or_ | _boolean_ "||" _boolean_ -> _boolean_ | [blue]`\|\|` | _Infix_ | _or_ | _boolean_ "\|\|" _boolean_ -> _boolean_
.1+|*ASSIGN*| [blue]`=` | _Infix_ | _assignment_ | _identifier_ "=" _any_ -> _any_ .1+|*ASSIGN*| [blue]`=` | _Infix_ | _assignment_ | _identifier_ "=" _any_ -> _any_
.1+|*BUT*| [blue]`but` | _Infix_ | _but_ | _any_ "but" _any_ -> _any_ .1+|*BUT*| [blue]`but` | _Infix_ | _but_ | _any_ "but" _any_ -> _any_
|=== |===
=== Functions === Functions
Functions in _Expr_ are very similar to functions in many programming languages.
In _Expr_ functions compute values in a local context (scope) that do not make effects on the calling context. This is the normal behavior. Using the reference operator [blue]`@` it is possibile to export local definition to the calling context.
==== Function calls ==== Function calls
#TODO: function calls operations# #TODO: function calls operations#
@ -359,8 +373,13 @@ The table below shows all supported operators by decreasing priorities.
==== Function definitions ==== Function definitions
#TODO: function definitions operations# #TODO: function definitions operations#
==== Builtins === Builtins
#TODO: builtins# #TODO: builtins#
==== Builtin functions
==== [blue]_import()_
[blue]_import([grey]#<source-file>#)_ loads the multi-expression contained in the specified source and returns its value.