author | Christian Urban <urbanc@in.tum.de> |
Tue, 16 Dec 2008 17:28:05 +0000 (2008-12-16) | |
changeset 58 | f3794c231898 |
parent 53 | 0c3580c831a4 |
child 59 | b5914f3c643c |
permissions | -rw-r--r-- |
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theory Antiquotes |
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imports "../Base" |
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begin |
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section {* Useful Document Antiquotations *} |
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text {* |
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{\bf Problem:} |
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How to keep your ML-code inside a document synchronised with the actual code?\smallskip |
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{\bf Solution:} This can be achieved using document antiquotations.\smallskip |
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Document antiquotations can be used for ensuring consistent type-setting of |
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various entities in a document. They can also be used for sophisticated |
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\LaTeX-hacking. |
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Below we give the code for two antiquotations that can be used to typeset |
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ML-code and also to check whether the given code actually compiles. This |
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provides a sanity check for the code and also allows one to keep documents |
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in sync with other code, for example Isabelle. |
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We first describe the antiquotation @{text "@{ML_checked \"expr\"}"}. This |
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antiquotation takes a piece of code as argument. The argument is checked |
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by sending the ML-expression @{text [quotes] "val _ = \<dots>"} containing the |
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given argument to the ML-compiler (i.e.~the function @{ML "ML_Context.eval_in"} |
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in Line 4 in the code below). The code of @{text "@{ML_checked \"expr\"}"} |
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is as follows: |
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*} |
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ML %linenumbers {*fun ml_val txt = "val _ = " ^ txt |
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fun output_ml ml src ctxt txt = |
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(ML_Context.eval_in (SOME ctxt) false Position.none (ml txt); |
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ThyOutput.output_list (fn _ => fn s => Pretty.str s) src ctxt |
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(space_explode "\n" txt)) |
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val _ = ThyOutput.add_commands |
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[("ML_checked", ThyOutput.args (Scan.lift Args.name) (output_ml ml_val))] |
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*} |
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text {* |
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Note that the parser @{ML "(Scan.lift Args.name)"} in line 9 parses a string, |
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in this case the code given as argument. This argument is send to the ML-compiler in the line 4. |
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If the code is ``approved'' by the compiler, then the output function @{ML |
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"ThyOutput.output_list (fn _ => fn s => Pretty.str s)"} in the next line pretty prints the |
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code. This function expects that the code is a list of strings where each |
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string correspond to a line. Therefore the @{ML "(space_explode \"\\n\" txt)" for txt} |
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which produces this list. There are a number of options for antiquotations |
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that are observed by @{ML ThyOutput.output_list} when printing the code (for |
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example @{text "[display]"}, @{text "[quotes]"} and @{text "[source]"}). |
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\begin{readmore} |
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For more information about options of antiquotations see \rsccite{sec:antiq}). |
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\end{readmore} |
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Since we used the argument @{ML "Position.none"}, the compiler cannot give specific |
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information about the line number where an error might have occurred. We |
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can improve this code slightly by writing |
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*} |
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ML %linenumbers {* fun output_ml ml src ctxt (txt,pos) = |
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(ML_Context.eval_in (SOME ctxt) false pos (ml txt); |
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ThyOutput.output_list (fn _ => fn s => Pretty.str s) src ctxt |
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(space_explode "\n" txt)) |
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val _ = ThyOutput.add_commands |
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[("ML_checked", ThyOutput.args |
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(Scan.lift (OuterParse.position Args.name)) (output_ml ml_val))] |
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*} |
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text {* |
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where in Lines 1 and 2 the positional information is properly treated. |
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(FIXME: say something about OuterParse.position) |
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We can now write in a document @{text "@{ML_checked \"2 + 3\"}"} in order to |
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obtain @{ML_checked "2 + 3"} and be sure that this code compiles until |
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somebody changes the definition of \mbox{@{ML "(op +)"}}. |
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The second antiquotation extends the first by allowing also to give |
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hints what the result of the ML-code is and check the consistency of |
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the actual result with these hints. For this we use the antiquotation |
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@{text "@{ML_response \"expr\" \"pat\"}"} |
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whose first argument is the ML-code and the second is a pattern specifying |
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the result. To add some convenience we allow the user to give a partial |
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specification using @{text "\<dots>"}. |
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In the antiquotation @{text "@{ML_checked \"expr\"}"} we send the expression |
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@{text [quotes] "val _ = expr"} to the compiler. Instead of the wildcard |
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@{text "_"}, we will here use the hints to construct a proper pattern. To |
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do this we need to replace the @{text "\<dots>"} by @{text "_"} before sending the |
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code to the compiler. The function |
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*} |
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ML {* |
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fun ml_pat (rhs, pat) = |
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let val pat' = implode (map (fn "\<dots>" => "_" | s => s) (Symbol.explode pat)) |
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in "val " ^ pat' ^ " = " ^ rhs end; |
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*} |
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will construct the pattern that the compiler can use. Next we like to add |
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a response indicator to the result using: |
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*} |
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ML {* |
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fun add_response_indicator txt = |
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map (fn s => "> " ^ s) (space_explode "\n" txt) |
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*} |
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text {* |
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The rest of the code of the antiquotation is |
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*} |
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ML {* |
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fun output_ml_response ml src ctxt ((lhs,pat),pos) = |
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(ML_Context.eval_in (SOME ctxt) false pos (ml (lhs,pat)); |
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let val txt = (space_explode "\n" lhs) @ (add_response_indicator pat) |
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in ThyOutput.output_list (fn _ => fn s => Pretty.str s) src ctxt txt end) |
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val _ = ThyOutput.add_commands |
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[("ML_response", |
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ThyOutput.args |
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(Scan.lift (OuterParse.position (Args.name -- Args.name))) |
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(output_ml_response ml_pat))] |
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*} |
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text {* |
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This extended antiquotation allows us to write |
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@{text [display] "@{ML_response [display] \"true andalso false\" \"false\"}"} |
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to obtain |
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@{ML_response [display] "true andalso false" "false"} |
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or |
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@{text [display] "@{ML_response [display] \"let val i = 3 in (i * i,\"foo\") end\" \"(9,\<dots>)\"}"} |
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to obtain |
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@{ML_response [display] "let val i = 3 in (i * i,\"foo\") end" "(9,\<dots>)"} |
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In both cases, the check by the compiler ensures that code and result match. A limitation |
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of this antiquotation is that the hints can only be given for results that can actually |
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be constructed as a pattern. This excludes values that are abstract datatypes, like |
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theorems or cterms. |
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*} |
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end |
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