X-Git-Url: https://ocean-lang.org/code/?p=ocean-D;a=blobdiff_plain;f=00-TODO;h=7bd6ddcf819c22b92e486c8b897229e14efefff8;hp=2885baacec2cde04f9d40392964eaf7a5a9a35d2;hb=c39500ef12ffba7114e3084979679940f83658b6;hpb=5a245ff2b74c48d2a50cc8d6f4529ef5abb84837

diff --git a/00-TODO b/00-TODO
index 2885baa..7bd6ddc 100644
--- a/00-TODO
+++ b/00-TODO
@@ -1,74 +1,167 @@
-This is a living document - delete things when done.  Avoid discussion.
+# This is a living document - delete things when done.  Avoid discussion.
 
+## Needs implementations
 
-Current version (Cataract Creek)
-- handle free_type more cleanly??
-- change 'labels' to only be created for 'use'
-- handle syntax errors better - recover quickly.
-- use precedence levels for expressions
-- structs
-   - const fields
-   - anonymous field - array or struct (or pointer to these)
-      multiple anon struct ar allowed if they don't conflict
-   - [] can apply to anon array field
-   - anon struct field gets fields interpolated
+### Current version (Cataract Creek)
 
-- manifest values for arrays and structs [a,b,c]
-- yet more operators
-     << >> #
-     bit-ops & | ~ &~
-     op=
-- split values so I can have an array of just the value (1 byte for u8)
-- integers, unsigned, bitfield, float
-- pointers
-   - owned or borrowed
-   - pure, loaded, overloaded, augmented
-   - owned: once, counted, collected
-- array slice
-- array buffer - can be added to and grows.
-- char, string search, regexp search
+- allow type names to be used before declared.  Need to re-evaluate all
+  type sizes after parse.
+- resolve the HACK of allowing assign from struct when name starts space.
+- '?' prefix operator returns Boolean, index operator for strings. Can be used to
+   test for end-of-string
+- ?? infix operator return LHS if '?' on it would succeed, else RHS
+- reference to struct or intrinsic (@foo), with @new, @free, @nil and ? to test
+- add [] as size-of-array
+- replace [foo::] declaration of array with [] - fix all main() calls
 
-- allow "do stuff" as a stand-alone statement (scope)
+### Next Version (Govetts Creek)
+- int nat cyc {i,n,c}{8,16,32,64} - maybe not cyc - it needs size.
+- ops: # & | ~ &~  - no shift: use (N * #shift) or (N / #shift)
+- op=
+- enum, with multi-valued names.  enum foo { yes, no, many(10) }
+  bar:foo=.yes; if bar == .no... if ?bar.many: print bar.many, "items"
+  Maybe .true and .false for Boolean
+- change use/case labels in ".name" which creates a local enum if no
+  type is evident.
+- set, with bool or int members.  set foo { pinned, memalloc, priority(4) }
+  bar:foo = .memalloc | .priority(2). if bar.pinned: bar.priority += 1
+- allow global names to be used before they are declared.  Assume global
+   if undeclared, and complain in final analysis.
+. array slices - references to arrays
+- array access to read bytes from strings.  How to get length?  "?string[4]" ??
+        array[] gets length??
+
+### Subsequent version
+- 'return' statement similar to 'use', but only valid a function context
+- 'return' can take no value when function has inline/transparent return value
+- simple methods.  Define "func type.name...." and the name will only be visible
+  within namespace for type.
+- optional args for functions - if value given
+- named args?  Needs to look like manifest structs
+- array args - last parameter can collect all remaining as array if attribute 'open'
+   do I need attribute?  Can anything be type compatible with both X and []X ??
+- initial values for return parameters
+- convert between string and array-of-cyc8
+- float64 float32
+- transparent fields, parameters which are structs or pointers
+- transparent fields which are arrays
+- transparent results from functions to have same effect as inline-results
+- manifest values for records: [.foo = a, .bar = b]
+- manifest values for arrays: [expr = expr, ...]
+- constant structure definitions
+- const structures can inherit from another, and update select fields.
+- 'use' labels *must* appear in case statements.
+- 'then' can extend a case section into some other.
+
+## Needs Design
+- union types - how do I want to support these? inheritance with variance?
+- lambda
+- 'error' value for various types. NIL for pointer NaN for float, extra flag bit
+   for integers.  -MAX_INT ??
+- enum as array index.  foo:[:enum]int.  foo[.baz] = 23
+- init_only fields
+- const fields in structs: like const, but in 'type' namespace, not 'module'
+- 'borrowed' and 'owned' attributes for pointers.  .free method
+- interfaces - list of methods that must be defined
+- standard interfaces to access operations: group, field, binary, logical
+- modules - exported names in versions, and import lists
+      on types, fields, constants, etc
+- foreach variable-list := make_generator() do
+      A generator has 'first', 'next' and 'finally' methods
+      'first' and 'next' return the same type which is conditional ('?' works)
+      'finally' returns some other type - possibly Tnone - which goes to
+      a set of case at end of loop
+
+- attributes for fields and local variables
+    transparent - names inside can be accessed directly
+    
+    handled    - accesses convert to function calls??
+    constant   - compile time constant - not stored
+    stable     - ??
+    add-only   - ?? like append-only.
+    read-only  - set early never changed?
+    mutable
+    owned      - Can be borrowed and freed
+    borrowed   - There is somewhere this is borrowed from
+    dependant  - ???
+    pure       - definitely not an error
+    endian(big,small,pdp)
+  attributes for whole struct
+    unsorted   - fields appear as written
+    packed     - like unsorted, but no gaps permitted.
+
+- lambda functions for passing as arg to function.
+   Are these always there to provide an interface for a value?
+   Do I want a syntax for functions that just provides a value
+     func (a:number; b:string):number = a+b[]
+   
+- units for numbers
+- iso suffixes for number?
+- static variables.  Easy to implement, but need a syntax.  Something
+  really loud.
+- concurrency
+      implicit and explict
+      reference attributes for locks and refcounts etc
+      RCU
+  - do/go/run/fork/async complex statement
+     All local variables accessed in the body are read-only
+     and copied to a new frame, and code is run in a new thread.
+     Thread is mostly invisible.  It interacts through shared objects,
+     particularly the caller might create a channel and the thread
+     might send messages on it.  Any interesting handshakes
+     are mediated by appropriate data structures.
+
+- arbitrary value asserts tied to variable attributes.
+  e.g. ranges for value and relationships between fields
+  These are tested by compiler at any changed.  Somehow.
+
+- expose parse info for editing by code run at compile time.
+  This allows new attributes to be implemented in app code.
+  E.g. handling bigendian fields by adding conversion functions.
 
-Next version (Govetts Creek):
-- functions and procedures
 - Finalize what a "main" program looks like.
+   should argv come from a library (sys.argv), or should environ go to main?
 
-Much later
-- per-field attributes
-    constant, stable, add-only, read-only, mutable, owned, borrowed, dependant, pure
-- records
-- enum
 - classes
    - constructors and destructors - or "after" ??
+     destructors, which can be declared inline
    - vtables, fat pointers, list of approaches
-- operators as interface methods
 - interfaces, inheritance
-- modules, imports and exports
-- closures, threads, co-routines, generators
+- closures, threads, co-routines, generators lamdas
+- generics/templates.  These should be just a compile-time
+  decision.  Same code can be called with suitable methods passed, or
+  recompiled in the new context and then optimised.
 - introspection / reflection ?
       e.g. support serialization
       find function given a string holding the name
       measure coverage, adjust based on performance metrics
       auto-create mock objects
       Is this just parsing the details in the obj file?
-- % formatting
-- string / slice / strbuf
-- parsing library - sscanf equiv, regexp, LALR
 - FFI
-- GTK
-- sockets / http / HTML
 - parameterised types, and dependant types
 - message passing primitives
 - overloading for numbers
 - exceptions ??
 - ensure list_head type concept can work
 - "union" type ??
-- pattern matching for destructuring??
-- casts??
-- typeswitch?
-- iso suffixes for number?
-- foreach?
-- case fall-through or go-to
-- break/continue or "next","last"
-- algebraic types
+NO - pattern matching for destructuring??
+- casts to and from "binary".
+NO- typeswitch?
+- ??? algebraic types
+
+## Needed in library
+ - augmented and overloaded pointers
+    An augmented pointer can also store a flag- for a bitlock etc
+    An overloaded pointer can alternately store an int - e.g. error code
+ - garbage collection?
+ - UTF8 string disection
+ - search, regexp
+ - cvt() interface an format() function
+ - parsing: rexep? LALR? sscan?
+ - buffered file IO
+ - auto-growing buffer including strings
+ - sockets
+ - http
+ - html
+ - gtk? xcb?
+