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-rw-r--r--core/control_flow.nom181
1 files changed, 70 insertions, 111 deletions
diff --git a/core/control_flow.nom b/core/control_flow.nom
index f7a8423..236c9a8 100644
--- a/core/control_flow.nom
+++ b/core/control_flow.nom
@@ -12,19 +12,16 @@ use "core/errors.nom"
# No-Op
test: do nothing
-(do nothing) compiles to (Lua "")
+(do nothing) compiles to ""
# Conditionals
test:
if (no):
barf "conditional fail"
-(if %condition %if_body) compiles to:
- %lua = (Lua "if ")
- %lua::append (%condition as lua expr)
- %lua::append " then\n "
- %lua::append (%if_body as lua statements)
- %lua::append "\nend"
- return %lua
+(if %condition %if_body) compiles to "\
+ ..if \(%condition as lua expr) then
+ \(%if_body as lua statements)
+ end"
test:
unless (yes):
@@ -32,15 +29,12 @@ test:
(unless %condition %unless_body) parses as (if (not %condition) %unless_body)
[..]
if %condition %if_body else %else_body, unless %condition %else_body else %if_body
-..all compile to:
- %lua = (Lua "if ")
- %lua::append (%condition as lua expr)
- %lua::append " then\n "
- %lua::append (%if_body as lua statements)
- %lua::append "\nelse\n "
- %lua::append (%else_body as lua statements)
- %lua::append "\nend"
- return %lua
+..all compile to "\
+ ..if \(%condition as lua expr) then
+ \(%if_body as lua statements)
+ else
+ \(%else_body as lua statements)
+ end"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -60,7 +54,7 @@ test:
equivalent of a conditional expression: (cond and if_true or if_false)
if {Text:yes, List:yes, Dict:yes, Number:yes}.(%when_true_expr.type):
return (..)
- Lua value "\
+ Lua "\
..(\(%condition as lua expr) and \(%when_true_expr as lua expr) or \(..)
%when_false_expr as lua expr
..)"
@@ -69,7 +63,7 @@ test:
doesn't have a proper ternary operator!)
To see why this is necessary consider: (random()<.5 and false or 99)
return (..)
- Lua value "\
+ Lua "\
..((function()
if \(%condition as lua expr) then
return \(%when_true_expr as lua expr)
@@ -91,17 +85,15 @@ test:
%i -= 1
unless (%i == 0): go to (Loop)
assume (%i == 0)
-[=== %label ===, --- %label ---, *** %label ***] all compile to (..)
- Lua "\
- ..::label_\(..)
- (%label.stub if (%label.type == "Action") else %label) as lua identifier
- ..::"
-
-(go to %label) compiles to (..)
- Lua "\
- ..goto label_\(..)
- (%label.stub if (%label.type == "Action") else %label) as lua identifier
- .."
+[=== %label ===, --- %label ---, *** %label ***] all compile to "\
+ ..::label_\(..)
+ (%label.stub if (%label.type == "Action") else %label) as lua identifier
+ ..::"
+
+(go to %label) compiles to "\
+ ..goto label_\(..)
+ (%label.stub if (%label.type == "Action") else %label) as lua identifier
+ .."
# Basic loop control
(stop %var) compiles to:
@@ -114,10 +106,10 @@ test:
return (..)
Lua "goto continue_\((%var.stub if (%var.type == "action") else %var) as lua identifier)"
..else: return (Lua "goto continue")
-[===stop %var ===, ---stop %var ---, ***stop %var ***] all compile to (..)
- Lua "::stop_\((%var.stub if (%var.type == "action") else %var) as lua identifier)::"
-[===next %var ===, ---next %var ---, ***next %var ***] all compile to (..)
- Lua "::continue_\((%var.stub if (%var.type == "action") else %var) as lua identifier)::"
+[===stop %var ===, ---stop %var ---, ***stop %var ***] all compile to "\
+ ..::stop_\((%var.stub if (%var.type == "action") else %var) as lua identifier)::"
+[===next %var ===, ---next %var ---, ***next %var ***] all compile to "\
+ ..::continue_\((%var.stub if (%var.type == "action") else %var) as lua identifier)::"
# While loops
test:
@@ -139,8 +131,8 @@ test:
barf "Failed to 'do next repeat'"
assume (%x == 30)
-(do next repeat) compiles to (Lua "goto continue_repeat")
-(stop repeating) compiles to (Lua "goto stop_repeat")
+(do next repeat) compiles to "goto continue_repeat"
+(stop repeating) compiles to "goto stop_repeat"
(repeat while %condition %body) compiles to:
%lua = (..)
Lua "\
@@ -155,8 +147,7 @@ test:
if (%body has subtree \(stop repeating)):
%inner_lua = %lua
%lua = (Lua "do -- scope of 'stop repeating' label\n ")
- %lua::append %inner_lua
- %lua::append "\
+ %lua::append %inner_lua "\
..
::stop_repeat::
end -- end of 'stop repeating' label scope"
@@ -183,8 +174,7 @@ test:
if (%body has subtree \(stop repeating)):
%inner_lua = %lua
%lua = (Lua "do -- scope of 'stop repeating' label\n ")
- %lua::append %inner_lua
- %lua::append "\
+ %lua::append %inner_lua "\
..
::stop_repeat::
end -- end of 'stop repeating' label scope"
@@ -226,20 +216,17 @@ test:
%step as lua expr
.. do"
- %lua::append "\n "
- %lua::append (%body as lua statements)
+ %lua::append "\n " (%body as lua statements)
if (%body has subtree \(do next)):
%lua::append "\n ::continue::"
if (%body has subtree \(do next %var)):
- %lua::append "\n "
- %lua::append (what (===next %var ===) compiles to)
+ %lua::append "\n " (what (===next %var ===) compiles to)
%lua::append "\nend --numeric for-loop"
if (%body has subtree \(stop %var)):
%inner_lua = %lua
%lua = (Lua "do -- scope for stopping for-loop\n ")
- %lua::append %inner_lua
- %lua::append "\n "
+ %lua::append %inner_lua "\n "
%lua::append (what (===stop %var ===) compiles to)
%lua::append "\nend -- end of scope for stopping for-loop"
@@ -273,15 +260,13 @@ test:
if (%body has subtree \(do next)):
%lua::append "\n ::continue::"
if (%body has subtree \(do next %var)):
- %lua::append "\n "
- %lua::append (what (===next %var ===) compiles to)
+ %lua::append "\n " (what (===next %var ===) compiles to)
%lua::append "\nend --foreach-loop"
if (%body has subtree \(stop %var)):
%inner_lua = %lua
%lua = (Lua "do -- scope for stopping for-loop\n ")
- %lua::append %inner_lua
- %lua::append "\n "
+ %lua::append %inner_lua "\n "
%lua::append (what (===stop %var ===) compiles to)
%lua::append "\nend -- end of scope for stopping for-loop"
@@ -296,15 +281,13 @@ test:
if (%body has subtree \(do next)):
%lua::append "\n ::continue::"
if (%body has subtree \(do next %var)):
- %lua::append "\n "
- %lua::append (what (===next %var ===) compiles to)
+ %lua::append "\n " (what (===next %var ===) compiles to)
%lua::append "\nend --foreach-loop"
if (%body has subtree \(stop %var)):
%inner_lua = %lua
%lua = (Lua "do -- scope for stopping for-loop\n ")
- %lua::append %inner_lua
- %lua::append "\n "
+ %lua::append %inner_lua "\n "
%lua::append (what (===stop %var ===) compiles to)
%lua::append "\nend -- end of scope for stopping for-loop"
@@ -335,34 +318,27 @@ test:
%iterable as lua expr
..) do"
- %lua::append "\n "
- %lua::append (%body as lua statements)
+ %lua::append "\n " (%body as lua statements)
if (%body has subtree \(do next)):
%lua::append "\n ::continue::"
if (%body has subtree \(do next %key)):
- %lua::append "\n "
- %lua::append (what (===next %key ===) compiles to)
+ %lua::append "\n " (what (===next %key ===) compiles to)
if (%body has subtree \(do next %value)):
- %lua::append "\n "
- %lua::append (what (===next %value ===) compiles to)
+ %lua::append "\n " (what (===next %value ===) compiles to)
%lua::append "\nend --foreach-loop"
%stop_labels = (Lua "")
if (%body has subtree \(stop %key)):
- %stop_labels::append "\n"
- %stop_labels::append (what (===stop %key ===) compiles to)
+ %stop_labels::append "\n" (what (===stop %key ===) compiles to)
if (%body has subtree \(stop %value)):
- %stop_labels::append "\n"
- %stop_labels::append (what (===stop %value ===) compiles to)
+ %stop_labels::append "\n" (what (===stop %value ===) compiles to)
if ((size of "\%stop_labels") > 0):
%inner_lua = %lua
%lua = (Lua "do -- scope for stopping for % = % loop\n ")
- %lua::append %inner_lua
- %lua::append %stop_labels
- %lua::append "\nend"
+ %lua::append %inner_lua %stop_labels "\nend"
return %lua
@@ -411,19 +387,16 @@ test:
..need a conditional block around it. Otherwise, make sure the 'else' \
..block comes last."
- %code::append "\nelse\n "
- %code::append (%action as lua statements)
+ %code::append "\nelse\n " (%action as lua statements)
%else_allowed = (no)
..else:
- %code::append %clause
- %code::append " "
+ %code::append %clause " "
for %i in 1 to ((size of %line) - 1):
if (%i > 1):
%code::append " or "
%code::append (%line.%i as lua expr)
- %code::append " then\n "
- %code::append (%action as lua statements)
+ %code::append " then\n " (%action as lua statements)
%clause = "\nelseif"
if ((size of "\%code") == 0):
@@ -472,42 +445,34 @@ test:
..need a conditional block around it. Otherwise, make sure the 'else' \
..block comes last."
- %code::append "\nelse\n "
- %code::append (%action as lua statements)
+ %code::append "\nelse\n " (%action as lua statements)
%else_allowed = (no)
..else:
- %code::append %clause
- %code::append " "
+ %code::append %clause " "
for %i in 1 to ((size of %line) - 1):
if (%i > 1):
%code::append " or "
- %code::append "\(mangle "branch value") == "
- %code::append (%line.%i as lua expr)
+ %code::append "\(mangle "branch value") == " (%line.%i as lua expr)
- %code::append " then\n "
- %code::append (%action as lua statements)
+ %code::append " then\n " (%action as lua statements)
%clause = "\nelseif"
if ((size of "\%code") == 0):
compile error at %body "'if' block has an empty body."
..hint "This means nothing would happen, so the 'if' block should be deleted."
%code::append "\nend --when"
- %lua = (..)
+ return (..)
Lua "\
..do --if % is...
- local \(mangle "branch value") = "
- %lua::append (%branch_value as lua expr)
- %lua::append "\n "
- %lua::append %code
- %lua::append "\nend --if % is..."
- return %lua
+ local \(mangle "branch value") = \(%branch_value as lua expr)
+ \%code
+ end -- if % is..."
# Do/finally
-(do %action) compiles to:
- %lua = (Lua "do\n ")
- %lua::append (%action as lua statements)
- %lua::append "\nend -- do"
- return %lua
+(do %action) compiles to "\
+ ..do
+ \(%action as lua statements)
+ end -- do"
test:
%d = {}
@@ -519,29 +484,24 @@ test:
assume (%d.x == "good")
(do %action then always %final_action) compiles to:
define mangler
- %lua = (..)
+ return (..)
Lua "\
..do
local \(mangle "fell_through") = false
- local \(mangle "ok"), \(mangle "ret") = pcall(function()"
- %lua::append "\n "
- %lua::append (%action as lua statements)
- %lua::append "\
- .. \(mangle "fell_through") = true
- end)"
- %lua::append "\n "
- %lua::append (%final_action as lua statements)
- %lua::append "\
- .. if not \(mangle "ok") then error(ret, 0) end
- if not \(mangle "fell_through") then return ret end
- end"
- return %lua
+ local \(mangle "ok"), \(mangle "ret") = pcall(function()
+ \(%action as lua statements)
+ \(mangle "fell_through") = true
+ end)
+ \(%final_action as lua statements)
+ if not \(mangle "ok") then error(ret, 0) end
+ if not \(mangle "fell_through") then return ret end
+ end"
test:
assume ((result of (: return 99)) == 99)
# Inline thunk:
-(result of %body) compiles to (Lua value "\(what ([] -> %body) compiles to)()")
+(result of %body) compiles to "\(what ([] -> %body) compiles to)()"
test:
%t = [1, [2, [[3], 4], 5, [[[6]]]]]
@@ -564,9 +524,8 @@ test:
..do
local \(mangle "stack \(%var.1)") = List{\(%structure as lua expr)}
while #\(mangle "stack \(%var.1)") > 0 do
- \(%var as lua expr) = table.remove(\(mangle "stack \(%var.1)"), 1)"
- %lua::append "\n "
- %lua::append (%body as lua statements)
+ \(%var as lua expr) = table.remove(\(mangle "stack \(%var.1)"), 1)
+ \(%body as lua statements)"
if (%body has subtree \(do next)):
%lua::append "\n ::continue::"
if (%body has subtree \(do next %var)):
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-01 07:53:50 +0000