mirror of
https://github.com/Sei-Lisa/LSL-PyOptimizer
synced 2025-07-01 23:58:20 +00:00
e5714eba25
Fixed by backtracking in the parser, and keeping a copy of the original expression if it's a simple_expr, which is used for output in place of the folded one. There's still the potential issue that if a global is optimized away, then it will "come back" during output and cause an error because the definition is missing.
319 lines
12 KiB
Python
319 lines
12 KiB
Python
# Convert a symbol table (with parse tree) back to a script.
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import lslfuncs
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from lslcommon import Key, Vector, Quaternion
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from lslparse import warning
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class outscript(object):
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binary_operands = frozenset(('||','&&','^','|','&','==','!=','<','<=','>',
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'>=','<<','>>','+','-','*','/','%', '=', '+=', '-=', '*=', '/=','%=',
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))
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extended_assignments = frozenset(('&=', '|=', '^=', '<<=', '>>='))
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unary_operands = frozenset(('NEG', '!', '~'))
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def Value2LSL(self, value):
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tvalue = type(value)
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if tvalue in (Key, unicode):
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pfx = sfx = ''
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if type(value) == Key:
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# Constants of type key can not be represented
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#raise lslfuncs.ELSLTypeMismatch
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# Actually they can be the result of folding.
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# On second thought, if we report the error, the location info
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# is lost. So we emit a warning instead, letting the compiler
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# report the error in the generated source.
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if self.globalmode and self.listmode:
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warning('WARNING: Illegal combo: Key type inside a global list')
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if self.listmode or not self.globalmode:
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if self.globalmode:
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pfx = '(key)'
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else:
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pfx = '((key)'
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sfx = ')'
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if '\t' in value:
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warning('WARNING: A string contains a tab. Tabs are expanded to four'
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' spaces by the viewer when copy-pasting the code.')
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return pfx + '"' + value.encode('utf8').replace('\\','\\\\') \
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.replace('"','\\"').replace('\n','\\n') + '"' + sfx
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if tvalue == int:
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if value < 0 and not self.globalmode and self.optsigns:
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#return '0x%X' % (value + 4294967296)
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return '((integer)' + str(value) + ')'
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return str(value)
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if tvalue == float:
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if self.optfloats and value.is_integer() and -2147483648.0 <= value < 2147483648.0:
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if self.globalmode and not self.listmode:
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return str(int(value))
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elif not self.globalmode:
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# Important inside lists!!
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return '((float)' + str(int(value)) + ')'
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s = str(value)
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if s in ('inf', '-inf', 'nan'):
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return '((float)"' + s + '")' # this shouldn't appear in globals
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# Try to remove as many decimals as possible but keeping the F32 value intact
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exp = s.find('e')
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if ~exp:
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s, exp = s[:exp], s[exp:]
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if exp[1] == '+':
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exp = exp[:1] + exp[2:]
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if '.' not in s:
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# I couldn't produce one but it's assumed that if it happens,
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# this code deals with it correctly
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s += '.' # pragma: no cover
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else:
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if '.' not in s:
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# This should never happen (Python should always return a point or exponent)
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return s + '.' # pragma: no cover
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exp = ''
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# Shorten the float as much as possible.
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while s[-1] != '.' and lslfuncs.F32(float(s[:-1]+exp)) == value:
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s = s[:-1]
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if s[-1] != '.':
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news = s
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neg = ''
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if s[0] == '-':
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news = s[1:]
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neg = '-'
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# Try harder
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point = news.index('.') + 1 - len(news) # Remove point
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news = str(int(news[:point-1] + news[point:]) + 1).zfill(len(news)-1) # Increment
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news = news[:point + len(news)] + '.' + news[point + len(news):] # Reinsert point
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# Repeat the operation with the incremented number
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while news[-1] != '.' and lslfuncs.F32(float(neg+news[:-1]+exp)) == value:
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news = news[:-1]
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if len(neg+news) < len(s) and lslfuncs.F32(float(neg+news[:-1]+exp)) == value:
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# Success! But we try even harder.
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if exp != '':
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if news[2:3] == '.': # we converted 9.9... into 10.
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newexp = 'e' + str(int(exp[1:])+1) # increase exponent
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news2 = news[0] + '.' + news[1] + news[3:] # move dot to the left
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while news2[-1] == '0': # remove trailing zeros
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news2 = news2[:-1]
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if len(neg+news2) < len(s) and lslfuncs.F32(float(neg+news2[:-1]+newexp)) == value:
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news = news2
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exp = newexp
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s = neg+news
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if value >= 0 or self.globalmode or not self.optsigns:
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return s + exp
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return '((float)' + s + exp + ')'
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if tvalue == Vector:
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return '<' + self.Value2LSL(value[0]) + ', ' + self.Value2LSL(value[1]) \
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+ ', ' + self.Value2LSL(value[2]) + '>'
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if tvalue == Quaternion:
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return '<' + self.Value2LSL(value[0]) + ', ' + self.Value2LSL(value[1]) \
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+ ', ' + self.Value2LSL(value[2]) + ', ' + self.Value2LSL(value[3]) + '>'
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if tvalue == list:
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if value == []:
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return '[]'
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if len(value) < 5:
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self.listmode = True
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ret = '[' + self.Value2LSL(value[0])
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for elem in value[1:]:
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ret += ', ' + self.Value2LSL(elem)
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ret += ']'
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self.listmode = False
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return ret
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ret = '\n'
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first = True
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self.indentlevel += 1
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for entry in value:
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if not first:
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ret += self.dent() + ', '
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else:
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ret += self.dent() + '[ '
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self.listmode = True
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ret += self.Value2LSL(entry) + '\n'
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self.listmode = False
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first = False
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self.indentlevel -= 1
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return ret + self.dent() + self.indent + ']'
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assert False, u'Value of unknown type in Value2LSL: ' + repr(value)
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def dent(self):
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return self.indent * self.indentlevel
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def OutIndented(self, node):
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if node['nt'] != '{}':
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self.indentlevel += 1
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ret = self.OutCode(node)
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if node['nt'] != '{}':
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self.indentlevel -= 1
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return ret
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def OutExprList(self, L):
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ret = ''
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if L:
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First = True
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for item in L:
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if not First:
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ret += ', '
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ret += self.OutExpr(item)
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First = False
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return ret
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def OutExpr(self, expr):
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# Handles expression nodes (as opposed to statement nodes)
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nt = expr['nt']
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if 'ch' in expr:
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child = expr['ch']
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if nt == '()':
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return '(' + self.OutExpr(child[0]) + ')'
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if nt in self.binary_operands:
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return self.OutExpr(child[0]) + ' ' + nt + ' ' + self.OutExpr(child[1])
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if nt == 'IDENT':
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return expr['name']
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if nt == 'CONST':
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return self.Value2LSL(expr['value'])
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if nt == 'CAST':
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ret = '(' + expr['t'] + ')'
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expr = child[0]
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if expr['nt'] in ('CONST', 'IDENT', 'V++', 'V--', 'VECTOR',
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'ROTATION', 'LIST', 'FIELD', 'PRINT', 'FUNCTION', '()'):
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return ret + self.OutExpr(expr)
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return ret + '(' + self.OutExpr(expr) + ')'
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if nt == 'LIST':
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self.listmode = True
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ret = '[' + self.OutExprList(child) + ']'
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self.listmode = False
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return ret
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if nt in ('VECTOR', 'ROTATION'):
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return '<' + self.OutExprList(child) + '>'
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if nt == 'FNCALL':
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return expr['name'] + '(' + self.OutExprList(child) + ')'
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if nt == 'PRINT':
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return 'print(' + self.OutExpr(child[0]) + ')'
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if nt in self.unary_operands:
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if nt == 'NEG':
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nt = '- '
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return nt + self.OutExpr(child[0])
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if nt == 'FLD':
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return self.OutExpr(child[0]) + '.' + expr['fld']
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if nt in ('V--', 'V++'):
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return self.OutExpr(child[0]) + ('++' if nt == 'V++' else '--')
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if nt in ('--V', '++V'):
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return ('++' if nt == '++V' else '--') + self.OutExpr(child[0])
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if nt in self.extended_assignments:
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lvalue = self.OutExpr(child[0])
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return lvalue + ' = ' + lvalue + ' ' + nt[:-1] + ' (' + self.OutExpr(child[1]) + ')'
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if nt == 'EXPRLIST':
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return self.OutExprList(child)
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assert False, 'Internal error: expression type "' + nt + '" not handled' # pragma: no cover
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def OutCode(self, node):
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nt = node['nt']
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if 'ch' in node:
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child = node['ch']
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else:
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child = None
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if nt == 'IF':
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ret = self.dent()
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while True:
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ret += 'if (' + self.OutExpr(child[0]) + ')\n' + self.OutIndented(child[1])
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if len(child) < 3:
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return ret
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if child[2]['nt'] != 'IF':
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ret += self.dent() + 'else\n' + self.OutIndented(child[2])
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return ret
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ret += self.dent() + 'else '
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node = child[2]
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child = node['ch']
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if nt == 'WHILE':
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ret = self.dent() + 'while (' + self.OutExpr(child[0]) + ')\n'
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ret += self.OutIndented(child[1])
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return ret
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if nt == 'DO':
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ret = self.dent() + 'do\n'
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ret += self.OutIndented(child[0])
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return ret + self.dent() + 'while (' + self.OutExpr(child[1]) + ');\n'
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if nt == 'FOR':
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ret = self.dent() + 'for ('
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ret += self.OutExpr(child[0])
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ret += '; ' + self.OutExpr(child[1]) + '; '
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ret += self.OutExpr(child[2])
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ret += ')\n'
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ret += self.OutIndented(child[3])
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return ret
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if nt == '@':
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return self.dent() + '@' + node['name'] + ';\n'
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if nt == 'JUMP':
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return self.dent() + 'jump ' + node['name'] + ';\n'
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if nt == 'STSW':
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return self.dent() + 'state ' + node['name'] + ';\n'
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if nt == 'RETURN':
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if child:
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return self.dent() + 'return ' + self.OutExpr(child[0]) + ';\n'
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return self.dent() + 'return;\n'
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if nt == 'DECL':
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ret = self.dent() + node['t'] + ' ' + node['name']
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if child:
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if 'orig' in child[0]:
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ret += ' = ' + self.OutExpr(child[0]['orig'])
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else:
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ret += ' = ' + self.OutExpr(child[0])
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return ret + ';\n'
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if nt == ';':
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return self.dent() + ';\n'
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if nt in ('STDEF', '{}'):
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ret = ''
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if nt == 'STDEF':
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if node['name'] == 'default':
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ret = self.dent() + 'default\n'
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else:
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ret = self.dent() + 'state ' + node['name'] + '\n'
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ret += self.dent() + '{\n'
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self.indentlevel += 1
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for stmt in node['ch']:
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ret += self.OutCode(stmt)
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self.indentlevel -= 1
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return ret + self.dent() + '}\n'
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if nt == 'FNDEF':
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ret = self.dent()
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if node['t'] is not None:
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ret += node['t'] + ' '
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ret += node['name'] + '('
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ret += ', '.join(typ + ' ' + name for typ, name in zip(node['ptypes'], node['pnames']))
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return ret + ')\n' + self.OutCode(child[0])
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return self.dent() + self.OutExpr(node) + ';\n'
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def output(self, treesymtab, options = ('optsigns','optfloats')):
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# Build a sorted list of dict entries
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self.tree, self.symtab = treesymtab
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# Optimize signs
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self.optsigns = 'optsigns' in options
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self.optfloats = 'optfloats' in options
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ret = ''
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self.indent = ' '
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self.indentlevel = 0
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self.globalmode = False
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self.listmode = False
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for node in self.tree:
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self.globalmode = node['nt'] == 'DECL'
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ret += self.OutCode(node)
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self.globalmode = False
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return ret
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