author | wenzelm |
Sat, 16 Apr 2011 15:25:25 +0200 | |
changeset 42359 | 6ca5407863ed |
parent 42290 | b1f544c84040 |
child 42361 | 23f352990944 |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/Datatype/datatype_case.ML |
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Author: Konrad Slind, Cambridge University Computer Laboratory |
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Author: Stefan Berghofer, TU Muenchen |
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Datatype package: nested case expressions on datatypes. |
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*) |
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signature DATATYPE_CASE = |
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sig |
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datatype config = Error | Warning | Quiet |
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type info = Datatype_Aux.info |
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val make_case: (string * typ -> info option) -> |
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Proof.context -> config -> string list -> term -> (term * term) list -> |
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term * (term * (int * bool)) list |
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val dest_case: (string -> info option) -> bool -> |
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string list -> term -> (term * (term * term) list) option |
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val strip_case: (string -> info option) -> bool -> |
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term -> (term * (term * term) list) option |
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val case_tr: bool -> (theory -> string * typ -> info option) -> |
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Proof.context -> term list -> term |
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val case_tr': (theory -> string -> info option) -> |
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string -> Proof.context -> term list -> term |
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end; |
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|
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structure Datatype_Case : DATATYPE_CASE = |
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struct |
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datatype config = Error | Warning | Quiet; |
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type info = Datatype_Aux.info; |
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exception CASE_ERROR of string * int; |
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fun match_type thy pat ob = Sign.typ_match thy (pat, ob) Vartab.empty; |
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(*--------------------------------------------------------------------------- |
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* Get information about datatypes |
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*---------------------------------------------------------------------------*) |
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fun ty_info tab sT = |
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(case tab sT of |
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SOME ({descr, case_name, index, sorts, ...} : info) => |
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let |
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val (_, (tname, dts, constrs)) = nth descr index; |
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val mk_ty = Datatype_Aux.typ_of_dtyp descr sorts; |
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val T = Type (tname, map mk_ty dts); |
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in |
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SOME {case_name = case_name, |
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constructors = map (fn (cname, dts') => |
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Const (cname, Logic.varifyT_global (map mk_ty dts' ---> T))) constrs} |
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end |
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| NONE => NONE); |
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(*--------------------------------------------------------------------------- |
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* Each pattern carries with it a tag (i,b) where |
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* i is the clause it came from and |
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* b=true indicates that clause was given by the user |
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* (or is an instantiation of a user supplied pattern) |
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* b=false --> i = ~1 |
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*---------------------------------------------------------------------------*) |
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fun pattern_subst theta (tm, x) = (subst_free theta tm, x); |
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fun row_of_pat x = fst (snd x); |
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fun add_row_used ((prfx, pats), (tm, tag)) = |
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fold Term.add_free_names (tm :: pats @ prfx); |
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(* try to preserve names given by user *) |
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fun default_names names ts = |
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map (fn ("", Free (name', _)) => name' | (name, _) => name) (names ~~ ts); |
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fun strip_constraints (Const (@{syntax_const "_constrain"}, _) $ t $ tT) = |
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strip_constraints t ||> cons tT |
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| strip_constraints t = (t, []); |
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fun mk_fun_constrain tT t = |
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Syntax.const @{syntax_const "_constrain"} $ t $ |
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(Syntax.const @{type_syntax fun} $ tT $ Syntax.const @{type_syntax dummy}); |
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(*--------------------------------------------------------------------------- |
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* Produce an instance of a constructor, plus genvars for its arguments. |
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*---------------------------------------------------------------------------*) |
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fun fresh_constr ty_match ty_inst colty used c = |
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let |
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val (_, Ty) = dest_Const c |
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val Ts = binder_types Ty; |
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val names = Name.variant_list used |
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(Datatype_Prop.make_tnames (map Logic.unvarifyT_global Ts)); |
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val ty = body_type Ty; |
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val ty_theta = ty_match ty colty handle Type.TYPE_MATCH => |
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raise CASE_ERROR ("type mismatch", ~1) |
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val c' = ty_inst ty_theta c |
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val gvars = map (ty_inst ty_theta o Free) (names ~~ Ts) |
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in (c', gvars) end; |
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(*--------------------------------------------------------------------------- |
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* Goes through a list of rows and picks out the ones beginning with a |
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* pattern with constructor = name. |
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*---------------------------------------------------------------------------*) |
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fun mk_group (name, T) rows = |
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let val k = length (binder_types T) in |
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fold (fn (row as ((prfx, p :: rst), rhs as (_, (i, _)))) => |
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fn ((in_group, not_in_group), (names, cnstrts)) => |
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(case strip_comb p of |
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(Const (name', _), args) => |
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if name = name' then |
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if length args = k then |
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let val (args', cnstrts') = split_list (map strip_constraints args) |
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in |
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((((prfx, args' @ rst), rhs) :: in_group, not_in_group), |
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(default_names names args', map2 append cnstrts cnstrts')) |
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end |
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else raise CASE_ERROR |
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("Wrong number of arguments for constructor " ^ name, i) |
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else ((in_group, row :: not_in_group), (names, cnstrts)) |
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| _ => raise CASE_ERROR ("Not a constructor pattern", i))) |
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rows (([], []), (replicate k "", replicate k [])) |>> pairself rev |
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end; |
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(*--------------------------------------------------------------------------- |
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* Partition the rows. Not efficient: we should use hashing. |
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*---------------------------------------------------------------------------*) |
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fun partition _ _ _ _ _ _ _ [] = raise CASE_ERROR ("partition: no rows", ~1) |
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| partition ty_match ty_inst type_of used constructors colty res_ty |
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(rows as (((prfx, _ :: rstp), _) :: _)) = |
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let |
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fun part {constrs = [], rows = [], A} = rev A |
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| part {constrs = [], rows = (_, (_, (i, _))) :: _, A} = |
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raise CASE_ERROR ("Not a constructor pattern", i) |
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| part {constrs = c :: crst, rows, A} = |
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let |
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val ((in_group, not_in_group), (names, cnstrts)) = |
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mk_group (dest_Const c) rows; |
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val used' = fold add_row_used in_group used; |
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val (c', gvars) = fresh_constr ty_match ty_inst colty used' c; |
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val in_group' = |
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if null in_group (* Constructor not given *) |
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then |
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let |
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val Ts = map type_of rstp; |
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val xs = Name.variant_list |
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(fold Term.add_free_names gvars used') |
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(replicate (length rstp) "x") |
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in |
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[((prfx, gvars @ map Free (xs ~~ Ts)), |
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(Const (@{const_syntax undefined}, res_ty), (~1, false)))] |
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end |
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else in_group |
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in |
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part{constrs = crst, |
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rows = not_in_group, |
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155 |
A = {constructor = c', |
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156 |
new_formals = gvars, |
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157 |
names = names, |
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158 |
constraints = cnstrts, |
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159 |
group = in_group'} :: A} |
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160 |
end |
42049 | 161 |
in part {constrs = constructors, rows = rows, A = []} end; |
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162 |
|
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163 |
(*--------------------------------------------------------------------------- |
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164 |
* Misc. routines used in mk_case |
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165 |
*---------------------------------------------------------------------------*) |
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166 |
|
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167 |
fun mk_pat ((c, c'), l) = |
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168 |
let |
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169 |
val L = length (binder_types (fastype_of c)) |
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170 |
fun build (prfx, tag, plist) = |
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171 |
let val (args, plist') = chop L plist |
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172 |
in (prfx, tag, list_comb (c', args) :: plist') end |
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173 |
in map build l end; |
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174 |
|
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fun v_to_prfx (prfx, v::pats) = (v::prfx,pats) |
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176 |
| v_to_prfx _ = raise CASE_ERROR ("mk_case: v_to_prfx", ~1); |
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177 |
|
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178 |
fun v_to_pats (v::prfx,tag, pats) = (prfx, tag, v::pats) |
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179 |
| v_to_pats _ = raise CASE_ERROR ("mk_case: v_to_pats", ~1); |
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180 |
|
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181 |
|
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182 |
(*---------------------------------------------------------------------------- |
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183 |
* Translation of pattern terms into nested case expressions. |
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184 |
* |
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185 |
* This performs the translation and also builds the full set of patterns. |
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186 |
* Thus it supports the construction of induction theorems even when an |
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187 |
* incomplete set of patterns is given. |
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188 |
*---------------------------------------------------------------------------*) |
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189 |
|
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190 |
fun mk_case tab ctxt ty_match ty_inst type_of used range_ty = |
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191 |
let |
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192 |
val name = Name.variant used "a"; |
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193 |
fun expand constructors used ty ((_, []), _) = |
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194 |
raise CASE_ERROR ("mk_case: expand_var_row", ~1) |
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195 |
| expand constructors used ty (row as ((prfx, p :: rst), rhs)) = |
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196 |
if is_Free p then |
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|
197 |
let |
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198 |
val used' = add_row_used row used; |
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|
199 |
fun expnd c = |
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200 |
let val capp = |
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201 |
list_comb (fresh_constr ty_match ty_inst ty used' c) |
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202 |
in ((prfx, capp :: rst), pattern_subst [(p, capp)] rhs) |
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203 |
end |
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204 |
in map expnd constructors end |
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205 |
else [row] |
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206 |
fun mk {rows = [], ...} = raise CASE_ERROR ("no rows", ~1) |
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207 |
| mk {path = [], rows = ((prfx, []), (tm, tag)) :: _} = (* Done *) |
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208 |
([(prfx, tag, [])], tm) |
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209 |
| mk {path, rows as ((row as ((_, [Free _]), _)) :: _ :: _)} = |
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210 |
mk {path = path, rows = [row]} |
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211 |
| mk {path = u :: rstp, rows as ((_, _ :: _), _) :: _} = |
42049 | 212 |
let val col0 = map (fn ((_, p :: _), (_, (i, _))) => (p, i)) rows in |
213 |
(case Option.map (apfst head_of) (find_first (not o is_Free o fst) col0) of |
|
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214 |
NONE => |
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215 |
let |
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216 |
val rows' = map (fn ((v, _), row) => row ||> |
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217 |
pattern_subst [(v, u)] |>> v_to_prfx) (col0 ~~ rows); |
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218 |
val (pref_patl, tm) = mk {path = rstp, rows = rows'} |
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219 |
in (map v_to_pats pref_patl, tm) end |
42049 | 220 |
| SOME (Const (cname, cT), i) => |
221 |
(case ty_info tab (cname, cT) of |
|
222 |
NONE => raise CASE_ERROR ("Not a datatype constructor: " ^ cname, i) |
|
223 |
| SOME {case_name, constructors} => |
|
224 |
let |
|
225 |
val pty = body_type cT; |
|
226 |
val used' = fold Term.add_free_names rstp used; |
|
227 |
val nrows = maps (expand constructors used' pty) rows; |
|
228 |
val subproblems = partition ty_match ty_inst type_of used' |
|
229 |
constructors pty range_ty nrows; |
|
230 |
val constructors' = map #constructor subproblems |
|
231 |
val news = map (fn {new_formals, group, ...} => |
|
232 |
{path = new_formals @ rstp, rows = group}) subproblems; |
|
233 |
val (pat_rect, dtrees) = split_list (map mk news); |
|
234 |
val case_functions = map2 |
|
235 |
(fn {new_formals, names, constraints, ...} => |
|
236 |
fold_rev (fn ((x as Free (_, T), s), cnstrts) => fn t => |
|
237 |
Abs (if s = "" then name else s, T, |
|
238 |
abstract_over (x, t)) |> |
|
239 |
fold mk_fun_constrain cnstrts) |
|
240 |
(new_formals ~~ names ~~ constraints)) |
|
241 |
subproblems dtrees; |
|
242 |
val types = map type_of (case_functions @ [u]); |
|
243 |
val case_const = Const (case_name, types ---> range_ty) |
|
244 |
val tree = list_comb (case_const, case_functions @ [u]) |
|
245 |
val pat_rect1 = maps mk_pat (constructors ~~ constructors' ~~ pat_rect) |
|
246 |
in (pat_rect1, tree) end) |
|
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247 |
| SOME (t, i) => raise CASE_ERROR ("Not a datatype constructor: " ^ |
42049 | 248 |
Syntax.string_of_term ctxt t, i)) |
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249 |
end |
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250 |
| mk _ = raise CASE_ERROR ("Malformed row matrix", ~1) |
42049 | 251 |
in mk end; |
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252 |
|
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253 |
fun case_error s = error ("Error in case expression:\n" ^ s); |
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254 |
|
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255 |
(* Repeated variable occurrences in a pattern are not allowed. *) |
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256 |
fun no_repeat_vars ctxt pat = fold_aterms |
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|
257 |
(fn x as Free (s, _) => (fn xs => |
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|
258 |
if member op aconv xs x then |
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|
259 |
case_error (quote s ^ " occurs repeatedly in the pattern " ^ |
24920 | 260 |
quote (Syntax.string_of_term ctxt pat)) |
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261 |
else x :: xs) |
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|
262 |
| _ => I) pat []; |
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263 |
|
32671 | 264 |
fun gen_make_case ty_match ty_inst type_of tab ctxt config used x clauses = |
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265 |
let |
35124 | 266 |
fun string_of_clause (pat, rhs) = |
267 |
Syntax.string_of_term ctxt (Syntax.const @{syntax_const "_case1"} $ pat $ rhs); |
|
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268 |
val _ = map (no_repeat_vars ctxt o fst) clauses; |
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269 |
val rows = map_index (fn (i, (pat, rhs)) => |
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270 |
(([], [pat]), (rhs, (i, true)))) clauses; |
35124 | 271 |
val rangeT = |
272 |
(case distinct op = (map (type_of o snd) clauses) of |
|
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273 |
[] => case_error "no clauses given" |
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|
274 |
| [T] => T |
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275 |
| _ => case_error "all cases must have the same result type"); |
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|
276 |
val used' = fold add_row_used rows used; |
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277 |
val (patts, case_tm) = mk_case tab ctxt ty_match ty_inst type_of |
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278 |
used' rangeT {path = [x], rows = rows} |
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|
279 |
handle CASE_ERROR (msg, i) => case_error (msg ^ |
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|
280 |
(if i < 0 then "" |
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|
281 |
else "\nIn clause\n" ^ string_of_clause (nth clauses i))); |
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|
282 |
val patts1 = map |
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|
283 |
(fn (_, tag, [pat]) => (pat, tag) |
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|
284 |
| _ => case_error "error in pattern-match translation") patts; |
35124 | 285 |
val patts2 = Library.sort (int_ord o pairself row_of_pat) patts1 |
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286 |
val finals = map row_of_pat patts2 |
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|
287 |
val originals = map (row_of_pat o #2) rows |
35124 | 288 |
val _ = |
42049 | 289 |
(case subtract (op =) finals originals of |
290 |
[] => () |
|
291 |
| is => |
|
292 |
(case config of Error => case_error | Warning => warning | Quiet => fn _ => {}) |
|
293 |
("The following clauses are redundant (covered by preceding clauses):\n" ^ |
|
294 |
cat_lines (map (string_of_clause o nth clauses) is))); |
|
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295 |
in |
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|
296 |
(case_tm, patts2) |
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|
297 |
end; |
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|
298 |
|
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|
299 |
fun make_case tab ctxt = gen_make_case |
32035 | 300 |
(match_type (ProofContext.theory_of ctxt)) Envir.subst_term_types fastype_of tab ctxt; |
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301 |
val make_case_untyped = gen_make_case (K (K Vartab.empty)) |
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302 |
(K (Term.map_types (K dummyT))) (K dummyT); |
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|
303 |
|
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304 |
|
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|
305 |
(* parse translation *) |
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306 |
|
24349 | 307 |
fun case_tr err tab_of ctxt [t, u] = |
42049 | 308 |
let |
309 |
val thy = ProofContext.theory_of ctxt; |
|
42359 | 310 |
val intern_const_syntax = Consts.intern_syntax (ProofContext.consts_of ctxt); |
35256 | 311 |
|
42049 | 312 |
(* replace occurrences of dummy_pattern by distinct variables *) |
313 |
(* internalize constant names *) |
|
314 |
fun prep_pat ((c as Const (@{syntax_const "_constrain"}, _)) $ t $ tT) used = |
|
315 |
let val (t', used') = prep_pat t used |
|
316 |
in (c $ t' $ tT, used') end |
|
317 |
| prep_pat (Const (@{const_syntax dummy_pattern}, T)) used = |
|
318 |
let val x = Name.variant used "x" |
|
319 |
in (Free (x, T), x :: used) end |
|
320 |
| prep_pat (Const (s, T)) used = |
|
321 |
(Const (intern_const_syntax s, T), used) |
|
322 |
| prep_pat (v as Free (s, T)) used = |
|
42359 | 323 |
let val s' = ProofContext.intern_const ctxt s in |
42049 | 324 |
if Sign.declared_const thy s' then |
325 |
(Const (s', T), used) |
|
326 |
else (v, used) |
|
327 |
end |
|
328 |
| prep_pat (t $ u) used = |
|
329 |
let |
|
330 |
val (t', used') = prep_pat t used; |
|
42359 | 331 |
val (u', used'') = prep_pat u used'; |
42049 | 332 |
in |
333 |
(t' $ u', used'') |
|
334 |
end |
|
335 |
| prep_pat t used = case_error ("Bad pattern: " ^ Syntax.string_of_term ctxt t); |
|
336 |
fun dest_case1 (t as Const (@{syntax_const "_case1"}, _) $ l $ r) = |
|
337 |
let val (l', cnstrts) = strip_constraints l |
|
338 |
in ((fst (prep_pat l' (Term.add_free_names t [])), r), cnstrts) end |
|
339 |
| dest_case1 t = case_error "dest_case1"; |
|
340 |
fun dest_case2 (Const (@{syntax_const "_case2"}, _) $ t $ u) = t :: dest_case2 u |
|
341 |
| dest_case2 t = [t]; |
|
42057
3eba96ff3d3e
more selective strip_positions in case patterns -- reactivate translations based on "case _ of _" in HOL and special patterns in HOLCF;
wenzelm
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|
342 |
val (cases, cnstrts) = split_list (map dest_case1 (dest_case2 u)); |
42049 | 343 |
val (case_tm, _) = make_case_untyped (tab_of thy) ctxt |
344 |
(if err then Error else Warning) [] |
|
345 |
(fold (fn tT => fn t => Syntax.const @{syntax_const "_constrain"} $ t $ tT) |
|
346 |
(flat cnstrts) t) cases; |
|
347 |
in case_tm end |
|
24349 | 348 |
| case_tr _ _ _ ts = case_error "case_tr"; |
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|
349 |
|
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|
350 |
|
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|
351 |
(*--------------------------------------------------------------------------- |
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|
352 |
* Pretty printing of nested case expressions |
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|
353 |
*---------------------------------------------------------------------------*) |
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parents:
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changeset
|
354 |
|
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parents:
diff
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|
355 |
(* destruct one level of pattern matching *) |
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parents:
diff
changeset
|
356 |
|
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|
357 |
fun gen_dest_case name_of type_of tab d used t = |
42049 | 358 |
(case apfst name_of (strip_comb t) of |
22779
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parents:
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changeset
|
359 |
(SOME cname, ts as _ :: _) => |
9ac0ca736969
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parents:
diff
changeset
|
360 |
let |
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parents:
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|
361 |
val (fs, x) = split_last ts; |
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berghofe
parents:
diff
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|
362 |
fun strip_abs i t = |
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parents:
diff
changeset
|
363 |
let |
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berghofe
parents:
diff
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|
364 |
val zs = strip_abs_vars t; |
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parents:
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|
365 |
val _ = if length zs < i then raise CASE_ERROR ("", 0) else (); |
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parents:
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|
366 |
val (xs, ys) = chop i zs; |
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parents:
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|
367 |
val u = list_abs (ys, strip_abs_body t); |
29270
0eade173f77e
moved old add_type_XXX, add_term_XXX etc. to structure OldTerm;
wenzelm
parents:
29266
diff
changeset
|
368 |
val xs' = map Free (Name.variant_list (OldTerm.add_term_names (u, used)) |
22779
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parents:
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|
369 |
(map fst xs) ~~ map snd xs) |
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parents:
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|
370 |
in (xs', subst_bounds (rev xs', u)) end; |
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parents:
diff
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|
371 |
fun is_dependent i t = |
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parents:
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|
372 |
let val k = length (strip_abs_vars t) - i |
42049 | 373 |
in k < 0 orelse exists (fn j => j >= k) (loose_bnos (strip_abs_body t)) end; |
22779
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|
374 |
fun count_cases (_, _, true) = I |
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|
375 |
| count_cases (c, (_, body), false) = |
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parents:
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|
376 |
AList.map_default op aconv (body, []) (cons c); |
35392
5da5ac6c6b77
gen_dest_case: recovered @{const_name} from c8a6fae0ad0c, because of separate Syntax.mark_const in case_tr' -- avoid extra syntax markers in output;
wenzelm
parents:
35363
diff
changeset
|
377 |
val is_undefined = name_of #> equal (SOME @{const_name undefined}); |
22779
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parents:
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changeset
|
378 |
fun mk_case (c, (xs, body), _) = (list_comb (c, xs), body) |
42049 | 379 |
in |
380 |
(case ty_info tab cname of |
|
22779
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parents:
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|
381 |
SOME {constructors, case_name} => |
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parents:
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|
382 |
if length fs = length constructors then |
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berghofe
parents:
diff
changeset
|
383 |
let |
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berghofe
parents:
diff
changeset
|
384 |
val cases = map (fn (Const (s, U), t) => |
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berghofe
parents:
diff
changeset
|
385 |
let |
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berghofe
parents:
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changeset
|
386 |
val k = length (binder_types U); |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
387 |
val p as (xs, _) = strip_abs k t |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
388 |
in |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
389 |
(Const (s, map type_of xs ---> type_of x), |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
390 |
p, is_dependent k t) |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
391 |
end) (constructors ~~ fs); |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
392 |
val cases' = sort (int_ord o swap o pairself (length o snd)) |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
393 |
(fold_rev count_cases cases []); |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
394 |
val R = type_of t; |
35124 | 395 |
val dummy = |
35392
5da5ac6c6b77
gen_dest_case: recovered @{const_name} from c8a6fae0ad0c, because of separate Syntax.mark_const in case_tr' -- avoid extra syntax markers in output;
wenzelm
parents:
35363
diff
changeset
|
396 |
if d then Const (@{const_name dummy_pattern}, R) |
42049 | 397 |
else Free (Name.variant used "x", R); |
22779
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berghofe
parents:
diff
changeset
|
398 |
in |
42049 | 399 |
SOME (x, |
400 |
map mk_case |
|
401 |
(case find_first (is_undefined o fst) cases' of |
|
402 |
SOME (_, cs) => |
|
403 |
if length cs = length constructors then [hd cases] |
|
404 |
else filter_out (fn (_, (_, body), _) => is_undefined body) cases |
|
405 |
| NONE => case cases' of |
|
406 |
[] => cases |
|
407 |
| (default, cs) :: _ => |
|
408 |
if length cs = 1 then cases |
|
409 |
else if length cs = length constructors then |
|
410 |
[hd cases, (dummy, ([], default), false)] |
|
411 |
else |
|
412 |
filter_out (fn (c, _, _) => member op aconv cs c) cases @ |
|
413 |
[(dummy, ([], default), false)])) |
|
22779
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parents:
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|
414 |
end handle CASE_ERROR _ => NONE |
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berghofe
parents:
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changeset
|
415 |
else NONE |
42049 | 416 |
| _ => NONE) |
22779
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berghofe
parents:
diff
changeset
|
417 |
end |
42049 | 418 |
| _ => NONE); |
22779
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berghofe
parents:
diff
changeset
|
419 |
|
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parents:
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changeset
|
420 |
val dest_case = gen_dest_case (try (dest_Const #> fst)) fastype_of; |
42290
b1f544c84040
discontinued special treatment of structure Lexicon;
wenzelm
parents:
42284
diff
changeset
|
421 |
val dest_case' = gen_dest_case (try (dest_Const #> fst #> Lexicon.unmark_const)) (K dummyT); |
22779
9ac0ca736969
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parents:
diff
changeset
|
422 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
423 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
424 |
(* destruct nested patterns *) |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
425 |
|
29623 | 426 |
fun strip_case'' dest (pat, rhs) = |
42049 | 427 |
(case dest (Term.add_free_names pat []) rhs of |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
428 |
SOME (exp as Free _, clauses) => |
29266 | 429 |
if member op aconv (OldTerm.term_frees pat) exp andalso |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
430 |
not (exists (fn (_, rhs') => |
29266 | 431 |
member op aconv (OldTerm.term_frees rhs') exp) clauses) |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
432 |
then |
29623 | 433 |
maps (strip_case'' dest) (map (fn (pat', rhs') => |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
434 |
(subst_free [(exp, pat')] pat, rhs')) clauses) |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
435 |
else [(pat, rhs)] |
42049 | 436 |
| _ => [(pat, rhs)]); |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
437 |
|
35124 | 438 |
fun gen_strip_case dest t = |
42049 | 439 |
(case dest [] t of |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
440 |
SOME (x, clauses) => |
29623 | 441 |
SOME (x, maps (strip_case'' dest) clauses) |
42049 | 442 |
| NONE => NONE); |
22779
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berghofe
parents:
diff
changeset
|
443 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
444 |
val strip_case = gen_strip_case oo dest_case; |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
445 |
val strip_case' = gen_strip_case oo dest_case'; |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
446 |
|
9ac0ca736969
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berghofe
parents:
diff
changeset
|
447 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
448 |
(* print translation *) |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
449 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
450 |
fun case_tr' tab_of cname ctxt ts = |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
451 |
let |
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
452 |
val thy = ProofContext.theory_of ctxt; |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
453 |
fun mk_clause (pat, rhs) = |
42049 | 454 |
let val xs = Term.add_frees pat [] in |
35124 | 455 |
Syntax.const @{syntax_const "_case1"} $ |
22779
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berghofe
parents:
diff
changeset
|
456 |
map_aterms |
42284 | 457 |
(fn Free p => Syntax_Trans.mark_boundT p |
42290
b1f544c84040
discontinued special treatment of structure Lexicon;
wenzelm
parents:
42284
diff
changeset
|
458 |
| Const (s, _) => Syntax.const (Lexicon.mark_const s) |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
459 |
| t => t) pat $ |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
460 |
map_aterms |
29266 | 461 |
(fn x as Free (s, T) => |
42284 | 462 |
if member (op =) xs (s, T) then Syntax_Trans.mark_bound s else x |
22779
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
463 |
| t => t) rhs |
42049 | 464 |
end; |
35124 | 465 |
in |
42049 | 466 |
(case strip_case' (tab_of thy) true (list_comb (Syntax.const cname, ts)) of |
35124 | 467 |
SOME (x, clauses) => |
468 |
Syntax.const @{syntax_const "_case_syntax"} $ x $ |
|
469 |
foldr1 (fn (t, u) => Syntax.const @{syntax_const "_case2"} $ t $ u) |
|
470 |
(map mk_clause clauses) |
|
42049 | 471 |
| NONE => raise Match) |
22779
9ac0ca736969
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berghofe
parents:
diff
changeset
|
472 |
end; |
9ac0ca736969
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berghofe
parents:
diff
changeset
|
473 |
|
9ac0ca736969
Parse / print translations for nested case expressions, taken
berghofe
parents:
diff
changeset
|
474 |
end; |