GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3

src-3.0/GF/Devel/Grammar/Grammar.hs

@@ -0,0 +1,172 @@
+module GF.Devel.Grammar.Grammar where
+
+import GF.Infra.Ident
+
+import GF.Data.Operations
+
+import Data.Map
+
+
+------------------
+-- definitions  --
+------------------
+
+data GF = GF {
+  gfabsname   :: Maybe Ident ,
+  gfcncnames  :: [Ident] ,
+  gflags      :: Map Ident String ,   -- value of a global flag
+  gfmodules   :: Map Ident Module
+  }
+
+data Module = Module {
+  mtype       :: ModuleType,
+  miscomplete :: Bool,
+  minterfaces :: [(Ident,Ident)],           -- non-empty for functors 
+  minstances  :: [((Ident,MInclude),[(Ident,Ident)])], -- non-empty for inst'ions
+  mextends    :: [(Ident,MInclude)],
+  mopens      :: [(Ident,Ident)],           -- used name, original name
+  mflags      :: Map Ident String,
+  mjments     :: Map Ident Judgement
+  }
+
+data ModuleType =
+    MTAbstract
+  | MTConcrete Ident
+  | MTInterface
+  | MTInstance Ident
+  | MTGrammar 
+  deriving Eq
+
+data MInclude =
+    MIAll
+  | MIExcept [Ident]
+  | MIOnly [Ident]
+
+type Indirection = (Ident,Bool) -- module of origin, whether canonical
+
+data Judgement = Judgement {
+  jform :: JudgementForm,  -- cat      fun   lincat  lin     oper    param
+  jtype :: Type,           -- context  type  lincat  -       type    PType
+  jdef  :: Term,           -- lindef   def   lindef  lin     def     constrs
+  jprintname :: Term,      -- -        -     prname  prname  -       -
+  jlink :: Ident,   -- if inherited, the supermodule name, else #
+  jposition :: Int  -- line number where def begins
+  } 
+  deriving Show
+
+data JudgementForm =
+    JCat
+  | JFun
+  | JLincat
+  | JLin
+  | JOper
+  | JParam
+  | JLink
+  deriving (Eq,Show)
+
+type Type = Term
+
+data Term =
+   Vr Ident             -- ^ variable
+ | Con Ident            -- ^ constructor
+ | EData                -- ^ to mark in definition that a fun is a constructor
+ | Sort String          -- ^ predefined type
+ | EInt Integer         -- ^ integer literal
+ | EFloat Double        -- ^ floating point literal
+ | K String             -- ^ string literal or token: @\"foo\"@
+ | Empty                -- ^ the empty string @[]@
+
+ | App Term Term        -- ^ application: @f a@
+ | Abs Ident Term       -- ^ abstraction: @\x -> b@
+ | Meta MetaSymb        -- ^ metavariable: @?i@ (only parsable: ? = ?0)
+ | Prod Ident Term Term -- ^ function type: @(x : A) -> B@
+ | Eqs [Equation]       -- ^ abstraction by cases: @fn {x y -> b ; z u -> c}@
+                        --   only used in internal representation
+ | Typed Term Term      -- ^ type-annotated term
+--
+-- /below this, the constructors are only for concrete syntax/
+ | Example Term String  -- ^ example-based term: @in M.C "foo"
+ | RecType [Labelling]  -- ^ record type: @{ p : A ; ...}@
+ | R [Assign]           -- ^ record:      @{ p = a ; ...}@
+ | P Term Label         -- ^ projection:  @r.p@
+ | PI Term Label Int    -- ^ index-annotated projection
+ | ExtR Term Term       -- ^ extension:   @R ** {x : A}@ (both types and terms)
+ 
+ | Table Term Term      -- ^ table type:  @P => A@
+ | T TInfo [Case]       -- ^ table:       @table {p => c ; ...}@
+ | V Type [Term]        -- ^ course of values: @table T [c1 ; ... ; cn]@
+ | S Term Term          -- ^ selection:   @t ! p@
+ | Val Type Int         -- ^ parameter value number: @T # i#
+
+ | Let LocalDef Term    -- ^ local definition: @let {t : T = a} in b@
+
+ | Q  Ident Ident       -- ^ qualified constant from a module
+ | QC Ident Ident       -- ^ qualified constructor from a module
+
+ | C Term Term          -- ^ concatenation: @s ++ t@
+ | Glue Term Term       -- ^ agglutination: @s + t@
+
+ | EPatt Patt
+ | EPattType Term
+
+ | EParam Term [(Ident,Context)] -- to encode parameter constructor sets
+
+ | FV [Term]            -- ^ free variation: @variants { s ; ... }@
+
+ | Alts (Term, [(Term, Term)]) -- ^ prefix-dependent: @pre {t ; s\/c ; ...}@
+
+ | Overload [(Type,Term)]
+
+  deriving (Read, Show, Eq, Ord)
+
+data Patt =
+   PC Ident [Patt]        -- ^ constructor pattern: @C p1 ... pn@    @C@ 
+ | PP Ident Ident [Patt]  -- ^ qualified constr patt: @P.C p1 ... pn@    @P.C@ 
+ | PV Ident               -- ^ variable pattern: @x@
+ | PW                     -- ^ wild card pattern: @_@
+ | PR [(Label,Patt)]      -- ^ record pattern: @{r = p ; ...}@
+ | PString String         -- ^ string literal pattern: @\"foo\"@
+ | PInt    Integer        -- ^ integer literal pattern: @12@
+ | PFloat Double          -- ^ float literal pattern: @1.2@
+ | PT Type Patt           -- ^ type-annotated pattern
+ | PAs Ident Patt         -- ^ as-pattern: x@p
+
+ -- regular expression patterns
+ | PNeg Patt              -- ^ negated pattern: -p
+ | PAlt Patt Patt         -- ^ disjunctive pattern: p1 | p2
+ | PSeq Patt Patt         -- ^ sequence of token parts: p + q
+ | PRep Patt              -- ^ repetition of token part: p*
+ | PChar                  -- ^ string of length one: ? 
+ | PChars String          -- ^ list of characters: ["aeiou"]
+
+ | PMacro Ident           -- #p
+ | PM Ident Ident         -- #m.p
+
+  deriving (Read, Show, Eq, Ord)
+
+-- | to guide computation and type checking of tables
+data TInfo = 
+   TRaw         -- ^ received from parser; can be anything
+ | TTyped Type  -- ^ type annotated, but can be anything
+ | TComp Type   -- ^ expanded
+ | TWild Type   -- ^ just one wild card pattern, no need to expand 
+  deriving (Read, Show, Eq, Ord)
+
+-- | record label
+data Label = 
+    LIdent String
+  | LVar Int
+   deriving (Read, Show, Eq, Ord)
+
+type MetaSymb = Int
+
+type Decl         = (Ident,Term)  -- (x:A)  (_:A)  A
+type Context      = [Decl]        -- (x:A)(y:B)   (x,y:A)   (_,_:A)
+type Substitution = [(Ident, Term)]
+type Equation     = ([Patt],Term) 
+
+type Labelling = (Label, Term) 
+type Assign    = (Label, (Maybe Type, Term)) 
+type Case      = (Patt, Term) 
+type LocalDef  = (Ident, (Maybe Type, Term))
+