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| author | Přemysl Janouch <p.janouch@gmail.com> | 2017-05-26 19:44:03 +0200 |
|---|---|---|
| committer | Přemysl Janouch <p.janouch@gmail.com> | 2017-05-26 20:15:43 +0200 |
| commit | 3e68a09ae1617551ca1cbf3b5b72621170b4aa0c (patch) | |
| tree | 8e5234c897c48c40c6e1f75e74febdc51e06e963 /README.adoc | |
| parent | 8414e07010b2265db3cbbd2854d8dc49acc63ac8 (diff) | |
| download | ell-3e68a09ae1617551ca1cbf3b5b72621170b4aa0c.tar.gz ell-3e68a09ae1617551ca1cbf3b5b72621170b4aa0c.tar.xz ell-3e68a09ae1617551ca1cbf3b5b72621170b4aa0c.zip | |
Remove suck
struct context::arguments stank, the "arg" special form stank.
The amount of lines this adds can be counted on one hand.
Diffstat (limited to 'README.adoc')
| -rw-r--r-- | README.adoc | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/README.adoc b/README.adoc index c31b576..12a397c 100644 --- a/README.adoc +++ b/README.adoc @@ -52,8 +52,8 @@ For a slightly more realistic example have a look at 'greet.ell'. Runtime ------- Variables use per-block dynamic scoping. Arguments to a block (which is a list -of lists) must be assigned to variables first using the `arg` special form, and -that must happen before they get overriden by execution of a different block. +of lists) are assigned to local variables named `1`, `2`, etc., and the full +list of them is stored in `*`. When evaluating a command, the first argument is typically a string with its name and it is resolved as if `set` was called on it. @@ -64,19 +64,18 @@ Special Forms ------------- `quote [<arg>]...` -Returns the arguments without any evaluation. - -`arg [<name>]...` - -Assigns arguments to the current block in order to given names. Names for which -there are no values left default to `[]`. This form can effectively be used to -declare local variables. +Like `values` but returns the arguments without any evaluation. Standard library ---------------- The standard library interprets the empty list and the empty string as false values, everything else is taken as true. +`local <names> [<value>]...` + +Create local variables in the current block. Names for which there are no +values left default to `()`. + `set <name> [<value>]` Retrieve or set a named variable. The syntax sugar for retrieval is `@`. @@ -167,6 +166,7 @@ Install development packages for GNU Readline to get a REPL for toying around: Possible Ways of Complicating ----------------------------- + * `local [_a _b _rest] @*` would elegantly solve the problem of varargs * reference counting: currently all values are always copied as needed, which is good enough for all imaginable use cases, simpler and less error-prone |