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Implement break/continue and switch().

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While on it, reorganize the help text and enable 'dcr' by default.
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Sei Lisa 2015-03-05 01:37:32 +01:00
parent a36715f121
commit cbcf60767a
2 changed files with 400 additions and 63 deletions
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86
main.py
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@ -15,6 +15,9 @@ That's an upper case o, not the number zero.
If filename is a dash (-) then standard input is used.
Options (+ means active by default, - means inactive by default):
Syntax extensions options:
extendedglobalexpr + Enables arbitrary expressions in globals (as opposed to
dull simple expressions allowed by regular LSL). Needs
the optimizer to run for the result to be compilable.
@ -29,38 +32,9 @@ Options (+ means active by default, - means inactive by default):
"abcd", no concatenation involved. Very useful when used
with a preprocessor. Similar to addstrings, but this one
is not an optimization, it introduces new syntax.
addstrings - Concatenate strings together when possible. Note that
such an optimization can be counter-productive in some
cases, that's why it is unset by default. For example:
string a="a"+"longstring"; string b="b"+"longstring";
would keep a single copy of "longstring", while if the
strings are added, "alongstring" and "blongstring" would
both take memory.
skippreproc + Skip preprocessor directives in the source as if they
were comments. Not useful unless the script is itself
the output of a preprocessor like cpp, which inserts
directives like: # 123 "filename".
optimize + Runs the optimizer.
optsigns + Optimize signs in float and integer constants.
optfloats + Optimize floats that represent an integral value.
constfold + Fold constant expressions to their values, and simplify
some expressions.
foldtabs - Tabs can't be copy-pasted, so expressions that produce
tabs (like llUnescapeURL("%%09") aren't optimized by
default. This option overrides that check, enabling
optimization of strings with tabs. The resulting source
isn't guaranteed to be copy-paste-able to the viewer.
duplabels - Normally, a duplicate label within a function is allowed
by the syntax by using {} blocks; however, the server
will just refuse to save the script (under Mono) or do
something completely unexpected (under LSO: all jumps
will go to the last label with that name). This flag
works around that limitation by replacing the names of
the labels in the output with unique ones.
shrinknames - Reduces script memory by shrinking identifiers. In the
process, it turns the script into unreadable gibberish,
hard to debug, but this gets big savings for complex
scripts.
breakcont - Allow break/continue statements for loops. Note that
when active, 'break' and 'continue' become reserved
words, but when inactive they can be used as variables.
lazylists - Support syntax like mylist[index] = 5; rather than using
llListReplaceList. Only assignment supported. The list
is extended when the argument is greater than the list
@ -68,12 +42,58 @@ Options (+ means active by default, - means inactive by default):
for compatibility with Firestorm, but its use is not
recommended, as it adds a new function, wasting memory
against the very spirit of this program.
enableswitch - Support C-like switch syntax, with some limitations.
Like lazylists, it's implemented for compatibility with
Firestorm, but not recommended. Note that the operand to
switch() may be evaluated more than once.
duplabels - Normally, a duplicate label within a function is allowed
by the syntax by using {} blocks; however, the server
will just refuse to save the script (under Mono) or do
something completely unexpected (under LSO: all jumps
will go to the last label with that name). This flag
works around that limitation by replacing the names of
the labels in the output with unique ones.
Optimization options
optimize + Runs the optimizer.
optsigns + Optimize signs in float and integer constants.
optfloats + Optimize floats that represent an integral value.
constfold + Fold constant expressions to their values, and simplify
some expressions.
dcr + Dead code removal. This option removes several instances
of code that will never execute, and performs other
optimizations like removal of unused variables,
functions or expressions.
shrinknames - Reduces script memory by shrinking identifiers. In the
process, it turns the script into unreadable gibberish,
hard to debug, but this gets big savings for complex
scripts.
addstrings - Concatenate strings together when possible. Note that
such an optimization can be counter-productive in some
cases, that's why it is unset by default. For example:
string a="a"+"longstring"; string b="b"+"longstring";
would keep a single copy of "longstring", while if the
strings are added, both "alongstring" and "blongstring"
take memory.
Miscellaneous options
foldtabs - Tabs can't be copy-pasted, so expressions that produce
tabs (like llUnescapeURL("%%09") aren't optimized by
default. This option overrides that check, enabling
optimization of strings with tabs. The resulting source
isn't guaranteed to be copy-paste-able to the viewer.
skippreproc + Skip preprocessor directives in the source as if they
were comments. Not useful unless the script is itself
the output of a preprocessor like cpp, which inserts
directives like: # 123 "filename".
''' % sys.argv[0])
return 1
options = set(('extendedglobalexpr','extendedtypecast','extendedassignment',
'allowkeyconcat','allowmultistrings','skippreproc','optimize',
'optsigns','optfloats','constfold'
'optsigns','optfloats','constfold','dcr'
))
if sys.argv[1] == '-O':