From 1fbc74f3ac15f187f477bda7112308bdc85c95d0 Mon Sep 17 00:00:00 2001 From: Mike Cifelli Date: Sun, 19 Nov 2017 10:53:21 -0500 Subject: [PATCH] Add ability to read large lists --- fitnesse/FitNesseRoot/RecentChanges.wiki | 2 +- .../TranscendentalLisp/Recursion.wiki | 5 +-- lisp/random/big-list.lisp | 1 + src/token/RightParenthesis.java | 8 +++-- src/token/Token.java | 36 +++++++++++++++---- 5 files changed, 40 insertions(+), 12 deletions(-) create mode 100644 lisp/random/big-list.lisp diff --git a/fitnesse/FitNesseRoot/RecentChanges.wiki b/fitnesse/FitNesseRoot/RecentChanges.wiki index 34a01b7..b933b35 100644 --- a/fitnesse/FitNesseRoot/RecentChanges.wiki +++ b/fitnesse/FitNesseRoot/RecentChanges.wiki @@ -1,4 +1,4 @@ -|TranscendentalLisp.Recursion||17:56:26 Sat, Nov 18, 2017| +|TranscendentalLisp.Recursion||10:47:58 Sun, Nov 19, 2017| |TranscendentalLisp||16:15:14 Fri, Mar 17, 2017| |TranscendentalLisp.Macros||10:10:15 Mon, Mar 13, 2017| |TranscendentalLisp.MacroTests||10:07:00 Mon, Mar 13, 2017| diff --git a/fitnesse/FitNesseRoot/TranscendentalLisp/Recursion.wiki b/fitnesse/FitNesseRoot/TranscendentalLisp/Recursion.wiki index f9f194c..ea73907 100644 --- a/fitnesse/FitNesseRoot/TranscendentalLisp/Recursion.wiki +++ b/fitnesse/FitNesseRoot/TranscendentalLisp/Recursion.wiki @@ -4,8 +4,9 @@ Test Test recursion capabilities of various functions. | script | lisp interpreter fixture | +| show | evaluate text | (load "lisp/random/big-list.lisp") | | show | evaluate text | (load "lisp/random/list-builder.lisp") | -| check | evaluate text | (setq big-list (list-doubler '(1 1 1 1 1 1 1 1) 11)) | =~/1\)$/ | +| check | evaluate text | big-list | =~/1\)$/ | | check | evaluate text | (length big-list) | 16384 | | check | evaluate text | (length (apply 'list big-list)) | 16384 | | check | evaluate text | (apply '/ big-list) | 1 | @@ -14,4 +15,4 @@ Test recursion capabilities of various functions. | check | evaluate text | (apply '- big-list) | -16382 | | check | evaluate text | (apply '= big-list) | T | | check | evaluate text | (apply '> (decreasing-list 0 10000)) | T | -| check | evaluate text | (apply '< (increasing-list 10000 10000)) | T | +| check | evaluate text | (apply '< (increasing-list 10000 10000)) | T | \ No newline at end of file diff --git a/lisp/random/big-list.lisp b/lisp/random/big-list.lisp new file mode 100644 index 0000000..418b53b --- /dev/null +++ b/lisp/random/big-list.lisp @@ -0,0 +1 @@ +(setq big-list '(1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1)) diff --git a/src/token/RightParenthesis.java b/src/token/RightParenthesis.java index a3e7074..99829c5 100644 --- a/src/token/RightParenthesis.java +++ b/src/token/RightParenthesis.java @@ -1,11 +1,13 @@ package token; -import static sexpression.Nil.NIL; +import static recursion.TailCalls.done; import java.util.function.Supplier; import error.LineColumnException; import file.FilePosition; +import recursion.TailCall; +import sexpression.Cons; import sexpression.SExpression; public class RightParenthesis extends Token { @@ -20,8 +22,8 @@ public class RightParenthesis extends Token { } @Override - public SExpression parseSExpressionTail(Supplier getNextToken) { - return NIL; + public TailCall parseListBackwards(Cons accumulator, Supplier getNextToken) { + return done(accumulator); } public static class StartsWithRightParenthesisException extends LineColumnException { diff --git a/src/token/Token.java b/src/token/Token.java index 2a622d7..b5808d8 100644 --- a/src/token/Token.java +++ b/src/token/Token.java @@ -1,8 +1,13 @@ package token; +import static recursion.TailCalls.done; +import static recursion.TailCalls.tailCall; +import static sexpression.Nil.NIL; + import java.util.function.Supplier; import file.FilePosition; +import recursion.TailCall; import sexpression.Cons; import sexpression.SExpression; @@ -24,19 +29,38 @@ public abstract class Token { return position; } - // s-expression ::= NUMBER | IDENTIFIER | STRING | QUOTE_MARK s-expression | LEFT_PAREN + // -------------------------------------------------------------------------------------------- + // s-expression + // ::= NUMBER | IDENTIFIER | STRING | QUOTE_MARK s-expression | LEFT_PAREN s-expression-tail + // // s-expression-tail - // s-expression-tail ::= RIGHT_PAREN | s-expression s-expression-tail + // ::= RIGHT_PAREN | s-expression s-expression-tail + // -------------------------------------------------------------------------------------------- public abstract SExpression parseSExpression(Supplier getNextToken); public SExpression parseSExpressionTail(Supplier getNextToken) { - SExpression first = parseSExpression(getNextToken); + Cons list = (Cons) parseListBackwards(NIL, getNextToken).invoke(); - Token nextToken = getNextToken.get(); - SExpression rest = nextToken.parseSExpressionTail(getNextToken); + return reverse(NIL, list).invoke(); + } - return new Cons(first, rest); + public TailCall parseListBackwards(Cons accumulator, Supplier getNextToken) { + Cons nextAccumulator = new Cons(parseSExpression(getNextToken), accumulator); + Token next = getNextToken.get(); + + return tailCall(() -> next.parseListBackwards(nextAccumulator, getNextToken)); + } + + // TODO - refactor into a built in function? + private TailCall reverse(Cons accumulator, Cons list) { + if (list.isNull()) + return done(accumulator); + + Cons nextAccumulator = new Cons(list.getFirst(), accumulator); + Cons rest = (Cons) list.getRest(); + + return tailCall(() -> reverse(nextAccumulator, rest)); } }