src/HOL/String.thy
author wenzelm
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(* Author: Tobias Nipkow, Florian Haftmann, TU Muenchen *)
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header {* Character and string types *}
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theory String
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imports List
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begin
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subsection {* Characters *}
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datatype nibble =
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    Nibble0 | Nibble1 | Nibble2 | Nibble3 | Nibble4 | Nibble5 | Nibble6 | Nibble7
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  | Nibble8 | Nibble9 | NibbleA | NibbleB | NibbleC | NibbleD | NibbleE | NibbleF
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lemma UNIV_nibble:
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  "UNIV = {Nibble0, Nibble1, Nibble2, Nibble3, Nibble4, Nibble5, Nibble6, Nibble7,
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    Nibble8, Nibble9, NibbleA, NibbleB, NibbleC, NibbleD, NibbleE, NibbleF}" (is "_ = ?A")
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proof (rule UNIV_eq_I)
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  fix x show "x \<in> ?A" by (cases x) simp_all
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qed
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instance nibble :: finite
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  by default (simp add: UNIV_nibble)
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datatype char = Char nibble nibble
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  -- "Note: canonical order of character encoding coincides with standard term ordering"
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lemma UNIV_char:
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  "UNIV = image (split Char) (UNIV \<times> UNIV)"
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proof (rule UNIV_eq_I)
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  fix x show "x \<in> image (split Char) (UNIV \<times> UNIV)" by (cases x) auto
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qed
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instance char :: finite
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  by default (simp add: UNIV_char)
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lemma size_char [code, simp]:
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  "size (c::char) = 0" by (cases c) simp
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lemma char_size [code, simp]:
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  "char_size (c::char) = 0" by (cases c) simp
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primrec nibble_pair_of_char :: "char \<Rightarrow> nibble \<times> nibble" where
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  "nibble_pair_of_char (Char n m) = (n, m)"
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setup {*
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let
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  val nibbles = map_range (Thm.cterm_of @{theory} o HOLogic.mk_nibble) 16;
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  val thms = map_product
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   (fn n => fn m => Drule.instantiate' [] [SOME n, SOME m] @{thm nibble_pair_of_char.simps})
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      nibbles nibbles;
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in
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  Global_Theory.note_thmss ""
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    [((@{binding nibble_pair_of_char_simps}, []), [(thms, [])])]
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  #-> (fn [(_, thms)] => fold_rev Code.add_eqn thms)
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end
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*}
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lemma char_case_nibble_pair [code, code_unfold]:
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  "char_case f = split f o nibble_pair_of_char"
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  by (simp add: fun_eq_iff split: char.split)
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lemma char_rec_nibble_pair [code, code_unfold]:
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  "char_rec f = split f o nibble_pair_of_char"
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  unfolding char_case_nibble_pair [symmetric]
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  by (simp add: fun_eq_iff split: char.split)
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syntax
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  "_Char" :: "str_position => char"    ("CHR _")
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subsection {* Strings *}
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type_synonym string = "char list"
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syntax
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  "_String" :: "str_position => string"    ("_")
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ML_file "Tools/string_syntax.ML"
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setup String_Syntax.setup
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definition chars :: string where
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  "chars = [Char Nibble0 Nibble0, Char Nibble0 Nibble1, Char Nibble0 Nibble2,
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  Char Nibble0 Nibble3, Char Nibble0 Nibble4, Char Nibble0 Nibble5,
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  Char Nibble0 Nibble6, Char Nibble0 Nibble7, Char Nibble0 Nibble8,
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  Char Nibble0 Nibble9, Char Nibble0 NibbleA, Char Nibble0 NibbleB,
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  Char Nibble0 NibbleC, Char Nibble0 NibbleD, Char Nibble0 NibbleE,
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  Char Nibble0 NibbleF, Char Nibble1 Nibble0, Char Nibble1 Nibble1,
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  Char Nibble1 Nibble2, Char Nibble1 Nibble3, Char Nibble1 Nibble4,
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  Char Nibble1 Nibble5, Char Nibble1 Nibble6, Char Nibble1 Nibble7,
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  Char Nibble1 Nibble8, Char Nibble1 Nibble9, Char Nibble1 NibbleA,
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  Char Nibble1 NibbleB, Char Nibble1 NibbleC, Char Nibble1 NibbleD,
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  Char Nibble1 NibbleE, Char Nibble1 NibbleF, CHR '' '', CHR ''!'',
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  Char Nibble2 Nibble2, CHR ''#'', CHR ''$'', CHR ''%'', CHR ''&'',
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  Char Nibble2 Nibble7, CHR ''('', CHR '')'', CHR ''*'', CHR ''+'', CHR '','',
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  CHR ''-'', CHR ''.'', CHR ''/'', CHR ''0'', CHR ''1'', CHR ''2'', CHR ''3'',
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  CHR ''4'', CHR ''5'', CHR ''6'', CHR ''7'', CHR ''8'', CHR ''9'', CHR '':'',
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  CHR '';'', CHR ''<'', CHR ''='', CHR ''>'', CHR ''?'', CHR ''@'', CHR ''A'',
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  CHR ''B'', CHR ''C'', CHR ''D'', CHR ''E'', CHR ''F'', CHR ''G'', CHR ''H'',
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  CHR ''I'', CHR ''J'', CHR ''K'', CHR ''L'', CHR ''M'', CHR ''N'', CHR ''O'',
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  CHR ''P'', CHR ''Q'', CHR ''R'', CHR ''S'', CHR ''T'', CHR ''U'', CHR ''V'',
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  CHR ''W'', CHR ''X'', CHR ''Y'', CHR ''Z'', CHR ''['', Char Nibble5 NibbleC,
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  CHR '']'', CHR ''^'', CHR ''_'', Char Nibble6 Nibble0, CHR ''a'', CHR ''b'',
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  CHR ''c'', CHR ''d'', CHR ''e'', CHR ''f'', CHR ''g'', CHR ''h'', CHR ''i'',
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  CHR ''j'', CHR ''k'', CHR ''l'', CHR ''m'', CHR ''n'', CHR ''o'', CHR ''p'',
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  CHR ''q'', CHR ''r'', CHR ''s'', CHR ''t'', CHR ''u'', CHR ''v'', CHR ''w'',
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  CHR ''x'', CHR ''y'', CHR ''z'', CHR ''{'', CHR ''|'', CHR ''}'', CHR ''~'',
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  Char Nibble7 NibbleF, Char Nibble8 Nibble0, Char Nibble8 Nibble1,
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  Char Nibble8 Nibble2, Char Nibble8 Nibble3, Char Nibble8 Nibble4,
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  Char Nibble8 Nibble5, Char Nibble8 Nibble6, Char Nibble8 Nibble7,
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  Char Nibble8 Nibble8, Char Nibble8 Nibble9, Char Nibble8 NibbleA,
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  Char Nibble8 NibbleB, Char Nibble8 NibbleC, Char Nibble8 NibbleD,
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  Char Nibble8 NibbleE, Char Nibble8 NibbleF, Char Nibble9 Nibble0,
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  Char Nibble9 Nibble1, Char Nibble9 Nibble2, Char Nibble9 Nibble3,
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  Char Nibble9 Nibble4, Char Nibble9 Nibble5, Char Nibble9 Nibble6,
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  Char Nibble9 Nibble7, Char Nibble9 Nibble8, Char Nibble9 Nibble9,
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  Char Nibble9 NibbleA, Char Nibble9 NibbleB, Char Nibble9 NibbleC,
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  Char Nibble9 NibbleD, Char Nibble9 NibbleE, Char Nibble9 NibbleF,
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  Char NibbleA Nibble0, Char NibbleA Nibble1, Char NibbleA Nibble2,
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  Char NibbleA Nibble3, Char NibbleA Nibble4, Char NibbleA Nibble5,
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  Char NibbleA Nibble6, Char NibbleA Nibble7, Char NibbleA Nibble8,
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  Char NibbleA Nibble9, Char NibbleA NibbleA, Char NibbleA NibbleB,
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  Char NibbleA NibbleC, Char NibbleA NibbleD, Char NibbleA NibbleE,
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  Char NibbleA NibbleF, Char NibbleB Nibble0, Char NibbleB Nibble1,
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  Char NibbleB Nibble2, Char NibbleB Nibble3, Char NibbleB Nibble4,
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  Char NibbleB Nibble5, Char NibbleB Nibble6, Char NibbleB Nibble7,
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  Char NibbleB Nibble8, Char NibbleB Nibble9, Char NibbleB NibbleA,
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  Char NibbleB NibbleB, Char NibbleB NibbleC, Char NibbleB NibbleD,
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  Char NibbleB NibbleE, Char NibbleB NibbleF, Char NibbleC Nibble0,
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  Char NibbleC Nibble1, Char NibbleC Nibble2, Char NibbleC Nibble3,
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  Char NibbleC Nibble4, Char NibbleC Nibble5, Char NibbleC Nibble6,
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  Char NibbleC Nibble7, Char NibbleC Nibble8, Char NibbleC Nibble9,
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  Char NibbleC NibbleA, Char NibbleC NibbleB, Char NibbleC NibbleC,
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  Char NibbleC NibbleD, Char NibbleC NibbleE, Char NibbleC NibbleF,
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  Char NibbleD Nibble0, Char NibbleD Nibble1, Char NibbleD Nibble2,
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  Char NibbleD Nibble3, Char NibbleD Nibble4, Char NibbleD Nibble5,
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  Char NibbleD Nibble6, Char NibbleD Nibble7, Char NibbleD Nibble8,
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  Char NibbleD Nibble9, Char NibbleD NibbleA, Char NibbleD NibbleB,
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  Char NibbleD NibbleC, Char NibbleD NibbleD, Char NibbleD NibbleE,
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  Char NibbleD NibbleF, Char NibbleE Nibble0, Char NibbleE Nibble1,
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  Char NibbleE Nibble2, Char NibbleE Nibble3, Char NibbleE Nibble4,
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  Char NibbleE Nibble5, Char NibbleE Nibble6, Char NibbleE Nibble7,
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  Char NibbleE Nibble8, Char NibbleE Nibble9, Char NibbleE NibbleA,
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  Char NibbleE NibbleB, Char NibbleE NibbleC, Char NibbleE NibbleD,
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  Char NibbleE NibbleE, Char NibbleE NibbleF, Char NibbleF Nibble0,
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  Char NibbleF Nibble1, Char NibbleF Nibble2, Char NibbleF Nibble3,
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  Char NibbleF Nibble4, Char NibbleF Nibble5, Char NibbleF Nibble6,
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  Char NibbleF Nibble7, Char NibbleF Nibble8, Char NibbleF Nibble9,
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  Char NibbleF NibbleA, Char NibbleF NibbleB, Char NibbleF NibbleC,
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  Char NibbleF NibbleD, Char NibbleF NibbleE, Char NibbleF NibbleF]"
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subsection {* Strings as dedicated type *}
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typedef literal = "UNIV :: string set"
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  morphisms explode STR ..
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instantiation literal :: size
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begin
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definition size_literal :: "literal \<Rightarrow> nat"
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where
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  [code]: "size_literal (s\<Colon>literal) = 0"
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instance ..
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end
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instantiation literal :: equal
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begin
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definition equal_literal :: "literal \<Rightarrow> literal \<Rightarrow> bool"
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where
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  "equal_literal s1 s2 \<longleftrightarrow> explode s1 = explode s2"
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instance
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proof
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qed (auto simp add: equal_literal_def explode_inject)
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end
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lemma STR_inject' [simp]: "(STR xs = STR ys) = (xs = ys)"
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by(simp add: STR_inject)
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subsection {* Code generator *}
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ML_file "Tools/string_code.ML"
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code_reserved SML string
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code_reserved OCaml string
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code_reserved Scala string
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code_type literal
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  (SML "string")
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  (OCaml "string")
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  (Haskell "String")
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  (Scala "String")
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setup {*
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  fold String_Code.add_literal_string ["SML", "OCaml", "Haskell", "Scala"]
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*}
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code_instance literal :: equal
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  (Haskell -)
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code_const "HOL.equal \<Colon> literal \<Rightarrow> literal \<Rightarrow> bool"
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  (SML "!((_ : string) = _)")
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  (OCaml "!((_ : string) = _)")
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  (Haskell infix 4 "==")
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  (Scala infixl 5 "==")
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hide_type (open) literal
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end