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| author | dos-reis <gdr@axiomatics.org> | 2011-12-15 00:18:30 +0000 |
|---|---|---|
| committer | dos-reis <gdr@axiomatics.org> | 2011-12-15 00:18:30 +0000 |
| commit | b2d2dace94f9316206cd83ebde5606d9ce4ff31a (patch) | |
| tree | 1797d3645f4f455eb178f0ffe4d560948926d449 /src/interp/g-opt.boot | |
| parent | 838ceddb3d0ea500a4eee199b14638810e3a36f3 (diff) | |
| download | open-axiom-b2d2dace94f9316206cd83ebde5606d9ce4ff31a.tar.gz | |
* interp/g-opt.boot (exitScope?): New.
(packWhen!): Use it.
(coagulateWhenSeries): Tidy.
(cancelScopeLeave!): Likewise.
Diffstat (limited to 'src/interp/g-opt.boot')
| -rw-r--r-- | src/interp/g-opt.boot | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/interp/g-opt.boot b/src/interp/g-opt.boot index 64dfbd9b..5aa43f69 100644 --- a/src/interp/g-opt.boot +++ b/src/interp/g-opt.boot @@ -285,10 +285,20 @@ coagulateWhenSeries(x,tag) == g(s,tag) == -- return list of reduced clauses if they all exit from same scope. s is ['%when,:.] => - [[p,y] for x in s.args while x is [p,['%leave,=tag,y]] or leave nil] + [u for x in s.args while (u := h(x,tag) or leave nil)] + where h(x,tag) == + x is [p,['%leave,=tag,y]] => [p,y] + x is [p,['%return,:.]] => x + nil nil nil +++ Return true if the expression `x' exist the scope with tag `g' +++ by normal local transfer or by exiting the enclosing function +++ with a `return' statement. +exitScope?(x,g) == + x is ['%leave,=g,:.] or x is ['%return,:.] + ++ Transform nested-to-tower. packWhen! x == walkWith!(x,function f) where f x == @@ -296,12 +306,14 @@ packWhen! x == walkWith!(x,function f) where repeat stmts = nil => leave nil s := first stmts - s is ['%when,[p,u:=['%leave,=g,.]],['%otherwise,v]] => + s is ['%when,[p,u],['%otherwise,v]] and exitScope?(u,g) => stmts.first := ['%when,[p,u]] stmts.rest := [v,:rest stmts] stmts := rest stmts y.args is [['%when,[p,['%leave,=g,u]]],['%leave,=g,v]] => resetTo(x,f ['%when,[p,u],['%otherwise,f mkScope(g,v)]]) + y.args is [['%when,[p,u:=['%return,:.]]],['%leave,=g,v]] => + resetTo(x,f ['%when,[p,u],['%otherwise,f mkScope(g,v)]]) coagulateWhenSeries(y,g) is [u,v] => resetTo(x,f ['%when,:u,['%otherwise,f mkDefault(g,v)]]) x @@ -323,6 +335,7 @@ cancelScopeLeave! x == walkWith!(x,function f) where f x == x is ['%scope,g,['%leave,=g,y]] and hasNoLeave?(y,g) => resetTo(x,f y) + x is ['%scope,g,u:=['%return,.,y]] => resetTo(x,u) x removeLeave! x == walkWith!(x,function f) where |