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Cleanup and refactoring.

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Bug when subtracting identical numbers.  It gives

    [false 0]

When it should be

    [false]

or better yet

    [true]

eh?
This commit is contained in:
Simon Forman
2022-10-15 11:05:17 -07:00
parent 062b01da55
commit 74f936efa0
2 changed files with 44 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files
implementations/bigints.joy
+24 -18
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@@ -4,34 +4,34 @@ clear
[bool-to-int [0] [1] branch]
[uncons-two [uncons] ii swapd]
[sandwich swap [cons] dip swoncat]
[build-list [i cons] genrec]
[digitalize [0 <=] [pop []] [base divmod swap] [i cons] genrec]
[digitalize [0 <=] [pop []] [base divmod swap] build-list]
[to-bigint [!-] [abs digitalize] cleave cons]
[from-bigint sign-int neg-if-necessary]
[sign-int [first] [prep from-bigint'] cleave]
[neg-if-necessary swap [neg] [] branch]
[prep rest 1 0 rolldown]
[from-bigint' [next-digit] step popd]
[next-digit [increase-power] [accumulate-digit] clop popdd]
[increase-power popop base *]
[accumulate-digit rolldown * +]
[sign-int [first] [prep from-bigint'] cleave]
[neg-if-necessary swap [neg] [] branch]
[from-bigint sign-int neg-if-necessary]
[neg-bigint [not] infra]
[add-with-carry _add-with-carry0 _add-with-carry1]
[_add-with-carry0 [bool-to-int] dipd + +]
[_add-with-carry1 base [mod] [>=] clop]
[add-carry-to-digits [pop not] [popd] [_actd_R0] [i cons] genrec]
[add-carry-to-digits [pop not] [popd] [_actd_R0] build-list]
[_actd_R0 [bool] [_actd_R0.then] [_actd_R0.else] ifte]
[_actd_R0.else popd 1 false rolldown]
[_actd_R0.then 0 swap uncons [add-with-carry] dip]
[add-digits initial-carry add-digits']
[initial-carry false rollup]
[add-digits' [P] [THEN] [R0] [R1] genrec]
[P [bool] ii & not]
[THEN [P'] [THEN'] [ELSE] ifte]
@@ -42,7 +42,9 @@ clear
[ELSE pop swap [] [1 swons] branch]
[same-sign [first] ii xor not]
[add-like-bigints [uncons] dip rest add-digits cons]
[extract-sign [uncons] dip rest]
[add-like-bigints extract-sign add-digits cons]
[add-bigints [same-sign] [add-like-bigints] [neg-bigint sub-like-bigints] ifte]
[build-two-list-combiner _btlc0 _btlc1 [[i cons] genrec] ccons cons]
@@ -55,24 +57,26 @@ clear
[carry [] [1 swons] branch]
[compare-pairs [bool not] [pop false] [[first [>=] infrst] [pop true]] [[rest] swoncat ifte] genrec]
[xR1 uncons-two [unit cons swons] dipd]
[xP [bool] ii & not]
[BASE [bool] [popop pop true] [[pop bool] [popop pop false] [popop compare-pairs] ifte] ifte]
[gt-bigint <<{} [xP] [BASE] [xR1] tailrec]
[check-gt [gt-bigint] [swap [not] dipd] [] ifte]
[compare-pairs [bool not] [pop false] [_comp-pairs0] [_comp-pairs1] genrec]
[_comp-pairs0 [first [>=] infrst] [pop true]]
[_comp-pairs1 [rest] swoncat ifte]
[sub-carry pop]
[check-gt [gt-bigint] [swap [not] dipd] [] ifte]
[gt-bigint <<{} [_gtb_P] [_gtb_BASE] [_gtb_R1] tailrec]
[_gtb_R1 uncons-two [unit cons swons] dipd]
[_gtb_P [bool] ii & not]
[_gtb_BASE [bool] [popop pop true] [_gtb_BASE'] ifte]
[_gtb_BASE' [pop bool] [popop pop false] [popop compare-pairs] ifte]
[sub-carry-from-digits [pop not] [popd] [_scfd_R0] [i cons-but-not-leading-zeroes] genrec] inscribe
[_scfd_R0 uncons 0 swap [sub-with-carry] dip] inscribe
[_scfd_R0 uncons 0 swap [sub-with-carry] dip]
[cons-but-not-leading-zeroes [P'] [cons] [popd] ifte]
[sub-with-carry _sub-with-carry0 _sub-with-carry1]
[_sub-with-carry0 rolldown bool-to-int [-] ii]
[_sub-with-carry1 [base + base mod] [0 <] cleave]
[sub-like-bigints [uncons] dip rest check-gt sub-digits cons]
[sub-like-bigints extract-sign check-gt sub-digits cons]
[sub-digits initial-carry sub-digits']
[sub-bigints [same-sign] [sub-like-bigints] [neg-bigint add-like-bigints] ifte]
@@ -87,8 +91,10 @@ build-two-list-combiner
inscribe
[sub-carry-from-digits]
[swap sub-carry]
[swap pop]
[sub-with-carry]
build-two-list-combiner
[sub-digits'] swoncat
inscribe
1234 to-bigint dup sub-bigints