--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Nominal/activities/tphols09/IDW/SB-Method.thy	Wed Mar 30 17:27:34 2016 +0100
@@ -0,0 +1,139 @@
+theory Method
+imports Main
+begin
+
+
+
+section {* A simple method *}
+
+ML {*
+val q1_syntax = Scan.succeed
+*}
+
+ML {*
+fun q1_method ctxt = SIMPLE_METHOD'
+  (Simplifier.simp_tac (Simplifier.context ctxt HOL_ss))
+*}
+
+method_setup Q1 = {* q1_syntax q1_method *} "The Q method"
+
+lemma True by Q1
+
+
+
+
+
+section {* Select a Subgoal *}
+
+ML {*
+val q2_syntax = OuterParse.nat
+*}
+
+ML {*
+fun q2_method i ctxt = SIMPLE_METHOD
+  (Simplifier.simp_tac (Simplifier.context ctxt HOL_ss) i)
+*}
+
+method_setup Q2 = {* Scan.lift q2_syntax >> q2_method *}
+  "The Q method"
+
+lemma "True = (True \<and> True)"
+  apply (intro iffI conjI)
+  apply (Q2 3)
+  sorry
+
+
+
+
+
+section {* Adding Theorems *}
+
+ML {*
+val q3_syntax =
+  Scan.lift (Args.add -- Args.colon) |-- Attrib.thms
+*}
+
+ML {*
+fun q3_method thms _ = SIMPLE_METHOD'
+  (Tactic.resolve_tac thms)
+*}
+
+method_setup Q3 = {* q3_syntax >> q3_method *}
+  "The Q method"
+
+lemma "t = t" by (Q3 add: refl)
+
+
+
+
+
+section {* Using the Context *}
+
+ML {*
+structure Q4_Rules = NamedThmsFun
+(
+  val name = "q4"
+  val description = "q4 rules"
+)
+*}
+setup Q4_Rules.setup
+
+ML {*
+fun q4_method ctxt = SIMPLE_METHOD'
+  (Tactic.resolve_tac (Q4_Rules.get ctxt))
+*}
+
+ML {*
+Q4_Rules.add
+*}
+
+ML {*
+val q4_syntax = Method.sections [
+  Args.add -- Args.colon >> K (I, Q4_Rules.add)]
+*}
+
+method_setup Q4 = {* q4_syntax >> K q4_method *}
+  "The Q method"
+
+lemma "t = t" by (Q4 add: refl)
+lemma "t = t" by (Q4 add: refl sym)
+lemma "t = t" by (Q4 add: refl add: sym)
+
+lemma "t = t" using refl[q4] by Q4
+
+
+
+
+
+section {* A Method Option *}
+
+ML {*
+val q5_opts = Scan.optional
+  (Args.parens (Args.$$$ "strict" >> K true))
+  false
+
+val q5_syntax =
+  Scan.lift q5_opts --
+  (Method.sections [
+    Args.add -- Args.colon >> K (I, Q4_Rules.add)] >> flat)
+*}
+
+ML {*
+fun q5_method (strict, thms) ctxt =
+  let val ths = if strict then thms else Q4_Rules.get ctxt
+  in SIMPLE_METHOD' (Tactic.resolve_tac ths) end
+*}
+
+method_setup Q5 = {* q5_syntax >> q5_method *}
+  "The Q method"
+
+lemma "t = t" by (Q5 add: refl)
+lemma "t = t" using refl[q4] by Q5
+(*
+lemma "t = t" using refl[q4] by (Q5 (strict))
+lemma "t = t" using refl[q4] by (Q5 (strict) add: conjI)
+*)
+lemma "t = t" by (Q5 (strict) add: refl)
+
+
+end
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