breaking change: 'concept' is now a keyword and used instead of 'generic'

compiler/lexer.nim

@@ -35,7 +35,7 @@ type
     tkSymbol, # keywords:
     tkAddr, tkAnd, tkAs, tkAsm, tkAtomic,
     tkBind, tkBlock, tkBreak, tkCase, tkCast,
-    tkConst, tkContinue, tkConverter,
+    tkConcept, tkConst, tkContinue, tkConverter,
     tkDefer, tkDiscard, tkDistinct, tkDiv, tkDo,
     tkElif, tkElse, tkEnd, tkEnum, tkExcept, tkExport,
     tkFinally, tkFor, tkFrom, tkFunc,
@@ -72,7 +72,7 @@ const
     "tkSymbol",
     "addr", "and", "as", "asm", "atomic",
     "bind", "block", "break", "case", "cast",
-    "const", "continue", "converter",
+    "concept", "const", "continue", "converter",
     "defer", "discard", "distinct", "div", "do",
     "elif", "else", "end", "enum", "except", "export",
     "finally", "for", "from", "func", "generic", "if",

compiler/parser.nim

@@ -1073,8 +1073,10 @@ proc primary(p: var TParser, mode: TPrimaryMode): PNode =
     else:
       result = newNodeP(nkObjectTy, p)
       getTok(p)
-  of tkGeneric:
+  of tkGeneric, tkConcept:
     if mode == pmTypeDef:
+      if p.tok.tokType == tkGeneric:
+        parMessage(p, warnDeprecated, "use 'concept' instead; 'generic'")
       result = parseTypeClass(p)
     else:
       parMessage(p, errInvalidToken, p.tok)
@@ -1107,7 +1109,7 @@ proc parseTypeDesc(p: var TParser): PNode =
 
 proc parseTypeDefAux(p: var TParser): PNode =
   #| typeDefAux = simpleExpr
-  #|            | 'generic' typeClass
+  #|            | 'concept' typeClass
   result = simpleExpr(p, pmTypeDef)
 
 proc makeCall(n: PNode): PNode =

compiler/renderer.nim

@@ -725,7 +725,7 @@ proc gproc(g: var TSrcGen, n: PNode) =
 proc gTypeClassTy(g: var TSrcGen, n: PNode) =
   var c: TContext
   initContext(c)
-  putWithSpace(g, tkGeneric, "generic")
+  putWithSpace(g, tkConcept, "concept")
   gsons(g, n[0], c) # arglist
   gsub(g, n[1]) # pragmas
   gsub(g, n[2]) # of

compiler/wordrecg.nim

@@ -23,7 +23,7 @@ type
     wInvalid,
 
     wAddr, wAnd, wAs, wAsm, wAtomic,
-    wBind, wBlock, wBreak, wCase, wCast, wConst,
+    wBind, wBlock, wBreak, wCase, wCast, wConcept, wConst,
     wContinue, wConverter, wDefer, wDiscard, wDistinct, wDiv, wDo,
     wElif, wElse, wEnd, wEnum, wExcept, wExport,
     wFinally, wFor, wFrom, wFunc, wGeneric, wIf, wImport, wIn,
@@ -103,7 +103,7 @@ const
 
     "addr", "and", "as", "asm", "atomic",
     "bind", "block", "break", "case", "cast",
-    "const", "continue", "converter",
+    "concept", "const", "continue", "converter",
     "defer", "discard", "distinct", "div", "do",
     "elif", "else", "end", "enum", "except", "export",
     "finally", "for", "from", "func", "generic", "if",

doc/grammar.txt

@@ -52,11 +52,11 @@ identOrLiteral = generalizedLit | symbol | literal
 tupleConstr = '(' optInd (exprColonEqExpr comma?)* optPar ')'
 arrayConstr = '[' optInd (exprColonEqExpr comma?)* optPar ']'
 primarySuffix = '(' (exprColonEqExpr comma?)* ')' doBlocks?
-              | doBlocks
-              | '.' optInd symbol generalizedLit?
-              | '[' optInd indexExprList optPar ']'
-              | '{' optInd indexExprList optPar '}'
-              | &( '`'|IDENT|literal|'cast') expr # command syntax
+      | doBlocks
+      | '.' optInd symbol generalizedLit?
+      | '[' optInd indexExprList optPar ']'
+      | '{' optInd indexExprList optPar '}'
+      | &( '`'|IDENT|literal|'cast'|'addr'|'type') expr # command syntax
 condExpr = expr colcom expr optInd
         ('elif' expr colcom expr optInd)*
          'else' colcom expr
@@ -94,7 +94,7 @@ primary = typeKeyw typeDescK
         / 'bind' primary
 typeDesc = simpleExpr
 typeDefAux = simpleExpr
-           | 'generic' typeClass
+           | 'concept' typeClass
 macroColon = ':' stmt? ( IND{=} 'of' exprList ':' stmt
                        | IND{=} 'elif' expr ':' stmt
                        | IND{=} 'except' exprList ':' stmt

doc/keywords.txt

@@ -1,6 +1,6 @@
 addr and as asm atomic
 bind block break
-case cast const continue converter
+case cast concept const continue converter
 defer discard distinct div do
 elif else end enum except export
 finally for from func

doc/manual/generics.txt

@@ -203,34 +203,34 @@ be inferred to have the equivalent of the `any` type class and thus they will
 match anything without discrimination.
 
 
-User defined type classes
--------------------------
+Concepts
+--------
 
-**Note**: User defined type classes are still in development.
+**Note**: Concepts are still in development.
 
-The user-defined type classes are available in two flavours - declarative and
-imperative. Both are used to specify an arbitrary set of requirements that the
-matched type must satisfy.
+Concepts, also known as "user-defined type classes", are available in two
+flavours - declarative and imperative. Both are used to specify an arbitrary
+set of requirements that the matched type must satisfy.
 
 Declarative type classes are written in the following form:
 
 .. code-block:: nim
   type
-    Comparable = generic x, y
+    Comparable = concept x, y
       (x < y) is bool
 
-    Container[T] = generic c
+    Container[T] = concept c
       c.len is ordinal
       items(c) is iterator
       for value in c:
         type(value) is T
 
-The type class will be matched if:
+The concept will be matched if:
 
 a) all of the expressions within the body can be compiled for the tested type
 b) all statically evaluatable boolean expressions in the body must be true
 
-The identifiers following the `generic` keyword represent instances of the
+The identifiers following the ``concept`` keyword represent instances of the
 currently matched type. These instances can act both as variables of the type,
 when used in contexts where a value is expected, and as the type itself when
 used in contexts where a type is expected.
@@ -240,18 +240,18 @@ type signatures of the required operations, but since type inference and
 default parameters are still applied in the provided block, it's also possible
 to encode usage protocols that do not reveal implementation details.
 
-As a special rule providing further convenience when writing type classes, any
+As a special rule providing further convenience when writing concepts, any
 type value appearing in a callable expression will be treated as a variable of
 the designated type for overload resolution purposes, unless the type value was
 passed in its explicit ``typedesc[T]`` form:
 
 .. code-block:: nim
   type
-    OutputStream = generic S
+    OutputStream = concept S
       write(var S, string)
 
-Much like generics, the user defined type classes will be instantiated exactly
-once for each tested type and any static code included within them will also be
+Much like generics, concepts are instantiated exactly
+once for each tested type and any static code included within them is also
 executed once.
 
 

doc/manual/typedesc.txt

@@ -6,7 +6,7 @@ static[T]
 
 **Note**: static[T] is still in development.
 
-As their name suggests, static params must be known at compile-time:
+As their name suggests, static parameters must be known at compile-time:
 
 .. code-block:: nim
 
@@ -25,22 +25,6 @@ For the purposes of code generation, all static params are treated as
 generic params - the proc will be compiled separately for each unique
 supplied value (or combination of values).
 
-Furthermore, the system module defines a `semistatic[T]` type that can be
-used to declare procs accepting both static and run-time values, which can
-optimize their body according to the supplied param using the `isStatic(p)`
-predicate:
-
-.. code-block:: nim
-
-  # The following proc will be compiled once for each unique static
-  # value and also once for the case handling all run-time values:
-
-  proc re(pattern: semistatic[string]): RegEx =
-    when isStatic(pattern):
-      result = precompiledRegex(pattern)
-    else:
-      result = compile(pattern)
-
 Static params can also appear in the signatures of generic types:
 
 .. code-block:: nim

lib/packages/docutils/highlite.nim

@@ -47,7 +47,7 @@ const
   # The following list comes from doc/keywords.txt, make sure it is
   # synchronized with this array by running the module itself as a test case.
   nimKeywords = ["addr", "and", "as", "asm", "atomic", "bind", "block",
-    "break", "case", "cast", "const", "continue", "converter",
+    "break", "case", "cast", "concept", "const", "continue", "converter",
     "defer", "discard", "distinct", "div", "do",
     "elif", "else", "end", "enum", "except", "export",
     "finally", "for", "from", "func",
@@ -554,10 +554,12 @@ when isMainModule:
   var keywords: seq[string]
   # Try to work running in both the subdir or at the root.
   for filename in ["doc/keywords.txt", "../../../doc/keywords.txt"]:
-    except: echo filename, " not found"
-    let input = string(readFile(filename))
-    keywords = input.split()
-    break
+    try:
+      let input = string(readFile(filename))
+      keywords = input.split()
+      break
+    except:
+      echo filename, " not found"
   doAssert(not keywords.isNil, "Couldn't read any keywords.txt file!")
   doAssert keywords.len == nimKeywords.len, "No matching lengths"
   for i in 0..keywords.len-1:

tests/concepts/tmanual.nim

@@ -22,7 +22,7 @@ template reject(e: expr) =
   static: assert(not compiles(e))
 
 type
-  Container[T] = generic C
+  Container[T] = concept C
     C.len is Ordinal
     items(c) is iterator
     for value in C:

tests/concepts/tswizzle.nim

@@ -40,7 +40,7 @@ proc isSwizzle(s: string): bool {.compileTime.} =
   return false
 
 type
-  StringIsSwizzle = generic value
+  StringIsSwizzle = concept value
     value.isSwizzle
 
   SwizzleStr = static[string] and StringIsSwizzle

tests/concepts/tusertypeclasses.nim

@@ -16,10 +16,10 @@ type
   TObj = object
     x: int
 
-  Sortable = generic x, y
+  Sortable = concept x, y
     (x < y) is bool
 
-  ObjectContainer = generic C
+  ObjectContainer = concept C
     C.len is Ordinal
     for v in items(C):
       v.type is tuple|object
@@ -38,7 +38,7 @@ proc intval(x: int): int = 10
 
 # check real and virtual fields
 type
-  TFoo = generic T
+  TFoo = concept T
     T.x
     y(T)
     intval T.y
@@ -50,7 +50,7 @@ proc testFoo(x: TFoo) = discard
 testFoo(TObj(x: 10))
 
 type
-  Matrix[Rows, Cols: static[int]; T] = generic M
+  Matrix[Rows, Cols: static[int]; T] = concept M
     M.M == Rows
     M.N == Cols
     M.T is T

tests/concepts/tusertypeclasses2.nim

@@ -1,5 +1,5 @@
 type
-  hasFieldX = generic z
+  hasFieldX = concept z
     z.x is int
 
   obj_x = object

todo.txt

@@ -5,6 +5,7 @@ version 0.10.4
 - improve GC-unsafety warnings
 - make 'nil' work for 'add' and 'len'
 - add "all threads are blocked" detection to 'spawn'
+- overloading of '='
 
 
 version 1.0
@@ -17,8 +18,6 @@ version 1.0
 - The bitwise 'not' operator will be renamed to 'bnot' to
   prevent 'not 4 == 5' from compiling. -> requires 'mixin' annotation for procs!
 - iterators always require a return type
-- overloading of '='
-
 - make nimble part of the distribution
 - split docgen into separate tool
 - special rule for ``[]=``, items, pairs

web/news.txt

@@ -41,7 +41,7 @@ News
     and not as ``type((x).name)``. Note that this also affects the AST
     structure; for immediate macro parameters ``nkCall('addr', 'x')`` is
     produced instead of ``nkAddr('x')``.
-
+  - ``concept`` is now a keyword and is used instead of ``generic``.
 
 
   Language Additions