Fix empty expression tags, and add directory support
This commit is contained in:
parent
a274797e58
commit
02cb984fec
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@ -1,6 +1,13 @@
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from engine import Engine
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import sys
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from pathlib import Path
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if __name__ == '__main__':
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Engine(sys.argv[1]).compileClass()
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p = Path(sys.argv[1])
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if p.is_dir():
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for f in p.glob("*.jack"):
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print("compiling %s" % f)
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Engine(f.as_posix()).compileClass()
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elif p.is_file():
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Engine(p.as_posix()).compileClass()
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@ -29,8 +29,8 @@ class Engine:
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def ZeroOrMany(self, grammarList, matchOnly):
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# print("ZOM called")
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ret = self.compile(grammarList[0], matchOnly)
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if ret and matchOnly:
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return True
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if matchOnly:
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return ret
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elif ret:
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# We now expect the whole of it
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for e in grammarList:
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@ -39,7 +39,7 @@ class Engine:
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self.ZeroOrMany(grammarList, False)
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return True
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else:
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return None
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return False
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def write(self, line, end = "\n"):
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self.file.write(self.i*" " + line + end)
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@ -54,6 +54,7 @@ class Engine:
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# We don't have to move the cursor for LL0 grammar
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if matchOnly:
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assert(lookahead == 1)
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return lookup_keys in dictionary
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for _ in range(lookahead-1):
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@ -85,7 +86,10 @@ class Engine:
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return True
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def ZeroOrOne(self, grammarTuple, matchOnly):
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if self.compile(grammarTuple[0], True):
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ret = self.compile(grammarTuple[0], True)
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if matchOnly:
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return ret
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elif ret:
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for e in grammarTuple:
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self.compile(e)
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return True
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@ -98,8 +102,8 @@ class Engine:
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current = self.atom()
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# We use in here to accomodate for bitmasks
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match = current in expected
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if match and matchOnly:
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return True
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if matchOnly:
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return match
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elif match:
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self.write(self.jt.xml_row(), end="")
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self.advance()
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@ -118,20 +122,17 @@ class Engine:
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"""
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If you set matchOnly = true, the cursor will not move forward
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if it is forced to move forward, it will instead RAISE AN ERROR
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If it is forced to move forward (LL1 grammar for eg,) it will raise an error instead
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"""
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def compile(self, thing, matchOnly = False):
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# TODO: OPEN TAGS
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if isinstance(thing, Element):
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ret = False
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if self.compile(thing.grammar[0], True):
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ret = self.compile(thing.grammar[0], True)
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if (matchOnly == False and ret) or thing.empty:
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self.open(thing)
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for e in thing.grammar:
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ret = self.compile(e)
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self.close(thing)
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return ret
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else:
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return ret
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return ret
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elif callable(thing):
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grammar = thing()
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return self.compile(grammar, matchOnly)
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@ -26,6 +26,7 @@ class Element:
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assert(type(grammar)==list)
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self.name = name
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self.grammar = grammar
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self.empty = False
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def __repr__(self):
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return self.name
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@ -51,8 +52,14 @@ CONSTANT = Atom.TRUE | Atom.FALSE|Atom.NULL|Atom.THIS
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""" Pseudo-element to help define subroutine declarations """
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RETURN_TYPES= Atom.INT | Atom.CHAR|Atom.BOOLEAN|Atom.IDENTIFIER|Atom.VOID
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# TODO: This is missing a lot of stuff
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TERM = Element('term', [Atom.INTEGERCONSTANT | Atom.STRINGCONSTANT | Atom.TRUE | Atom.FALSE | Atom.IDENTIFIER])
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# TODO: This is missing the following:
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# var [expression]
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# subRoutineCall
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# (expressions in parenthes)
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# unaryOP TERM
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TERM = Element('term', [
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Atom.INTEGERCONSTANT | Atom.STRINGCONSTANT | Atom.TRUE | Atom.FALSE | Atom.NULL| Atom.THIS | Atom.IDENTIFIER
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])
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EXPRESSION = Element('expression', [TERM, [OP, TERM]])
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@ -132,6 +139,8 @@ PARAMETER_LIST = Element('parameterList', [(
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[Atom.COMMA, Atom.INT | Atom.CHAR|Atom.BOOLEAN|Atom.IDENTIFIER, Atom.IDENTIFIER]
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)])
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EXPRESSIONLIST.empty = PARAMETER_LIST.empty = True
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SUBROUTINEDEC = Element('subroutineDec', [
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# (constructor | function | method) (void | type) subRoutineName '(' parameterList ')'
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# subroutineBody
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@ -13,6 +13,8 @@
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<keyword> void </keyword>
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<identifier> main </identifier>
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<symbol> ( </symbol>
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<parameterList>
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</parameterList>
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<symbol> ) </symbol>
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<subroutineBody>
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<symbol> { </symbol>
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@ -27,10 +29,10 @@
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<keyword> let </keyword>
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<identifier> game </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> game </identifier>
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</term>
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<expression>
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<term>
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<identifier> game </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -40,6 +42,8 @@
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<symbol> . </symbol>
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<identifier> run </identifier>
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<symbol> ( </symbol>
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<expressionList>
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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@ -49,6 +53,8 @@
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<symbol> . </symbol>
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<identifier> dispose </identifier>
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<symbol> ( </symbol>
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<expressionList>
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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@ -65,6 +71,8 @@
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<keyword> void </keyword>
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<identifier> test </identifier>
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<symbol> ( </symbol>
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<parameterList>
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</parameterList>
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<symbol> ) </symbol>
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<subroutineBody>
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<symbol> { </symbol>
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@ -92,10 +100,10 @@
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<ifStatement>
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<keyword> if </keyword>
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<symbol> ( </symbol>
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<term>
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<identifier> i </identifier>
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</term>
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<expression>
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<term>
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<identifier> i </identifier>
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</term>
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</expression>
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<symbol> ) </symbol>
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<symbol> { </symbol>
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@ -104,10 +112,10 @@
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<keyword> let </keyword>
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<identifier> s </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> i </identifier>
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</term>
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<expression>
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<term>
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<identifier> i </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -115,10 +123,10 @@
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<keyword> let </keyword>
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<identifier> s </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> j </identifier>
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</term>
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<expression>
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<term>
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<identifier> j </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -126,17 +134,17 @@
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<keyword> let </keyword>
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<identifier> a </identifier>
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<symbol> [ </symbol>
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<term>
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<identifier> i </identifier>
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</term>
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<expression>
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<term>
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<identifier> i </identifier>
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</term>
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</expression>
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<symbol> ] </symbol>
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<symbol> = </symbol>
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<term>
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<identifier> j </identifier>
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</term>
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<expression>
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<term>
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<identifier> j </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -149,10 +157,10 @@
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<keyword> let </keyword>
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<identifier> i </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> i </identifier>
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</term>
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<expression>
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<term>
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<identifier> i </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -160,10 +168,10 @@
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<keyword> let </keyword>
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<identifier> j </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> j </identifier>
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</term>
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<expression>
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<term>
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<identifier> j </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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@ -171,10 +179,10 @@
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<keyword> let </keyword>
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<identifier> i </identifier>
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<symbol> = </symbol>
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<term>
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<identifier> i </identifier>
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</term>
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<expression>
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<term>
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<identifier> i </identifier>
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</term>
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<symbol> | </symbol>
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<term>
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<identifier> j </identifier>
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@ -0,0 +1,967 @@
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<class>
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<keyword> class </keyword>
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<identifier> Square </identifier>
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<symbol> { </symbol>
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<classVarDec>
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<keyword> field </keyword>
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<keyword> int </keyword>
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<identifier> x </identifier>
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<symbol> , </symbol>
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<identifier> y </identifier>
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<symbol> ; </symbol>
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</classVarDec>
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<classVarDec>
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<keyword> field </keyword>
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<keyword> int </keyword>
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<identifier> size </identifier>
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<symbol> ; </symbol>
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</classVarDec>
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<subroutineDec>
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<keyword> constructor </keyword>
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<identifier> Square </identifier>
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<identifier> new </identifier>
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<symbol> ( </symbol>
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<parameterList>
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<keyword> int </keyword>
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<identifier> Ax </identifier>
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<symbol> , </symbol>
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<keyword> int </keyword>
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<identifier> Ay </identifier>
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<symbol> , </symbol>
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<keyword> int </keyword>
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<identifier> Asize </identifier>
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</parameterList>
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<symbol> ) </symbol>
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<subroutineBody>
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<symbol> { </symbol>
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<statements>
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<letStatement>
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<keyword> let </keyword>
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<identifier> x </identifier>
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<symbol> = </symbol>
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<expression>
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<term>
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<identifier> Ax </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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<letStatement>
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<keyword> let </keyword>
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<identifier> y </identifier>
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<symbol> = </symbol>
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<expression>
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<term>
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<identifier> Ay </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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<letStatement>
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<keyword> let </keyword>
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<identifier> size </identifier>
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<symbol> = </symbol>
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<expression>
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<term>
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<identifier> Asize </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</letStatement>
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<doStatement>
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<keyword> do </keyword>
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<identifier> draw </identifier>
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<symbol> ( </symbol>
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<expressionList>
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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<returnStatement>
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<keyword> return </keyword>
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<expression>
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<term>
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<identifier> x </identifier>
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</term>
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</expression>
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<symbol> ; </symbol>
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</returnStatement>
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</statements>
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<symbol> } </symbol>
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</subroutineBody>
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</subroutineDec>
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<subroutineDec>
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<keyword> method </keyword>
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<keyword> void </keyword>
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<identifier> dispose </identifier>
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<symbol> ( </symbol>
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<parameterList>
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</parameterList>
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<symbol> ) </symbol>
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<subroutineBody>
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<symbol> { </symbol>
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<statements>
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<doStatement>
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<keyword> do </keyword>
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<identifier> Memory </identifier>
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<symbol> . </symbol>
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<identifier> deAlloc </identifier>
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<symbol> ( </symbol>
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<expressionList>
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<expression>
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<term>
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<keyword> this </keyword>
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</term>
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</expression>
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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<returnStatement>
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<keyword> return </keyword>
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<symbol> ; </symbol>
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</returnStatement>
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</statements>
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<symbol> } </symbol>
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</subroutineBody>
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</subroutineDec>
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<subroutineDec>
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<keyword> method </keyword>
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<keyword> void </keyword>
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<identifier> draw </identifier>
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<symbol> ( </symbol>
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<parameterList>
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</parameterList>
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<symbol> ) </symbol>
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<subroutineBody>
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<symbol> { </symbol>
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<statements>
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<doStatement>
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<keyword> do </keyword>
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<identifier> Screen </identifier>
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<symbol> . </symbol>
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<identifier> setColor </identifier>
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<symbol> ( </symbol>
|
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<expressionList>
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<expression>
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<term>
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<identifier> x </identifier>
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</term>
|
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</expression>
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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<doStatement>
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<keyword> do </keyword>
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<identifier> Screen </identifier>
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<symbol> . </symbol>
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<identifier> drawRectangle </identifier>
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<symbol> ( </symbol>
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<expressionList>
|
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<expression>
|
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<term>
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<identifier> x </identifier>
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</term>
|
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</expression>
|
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<symbol> , </symbol>
|
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<expression>
|
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<term>
|
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<identifier> y </identifier>
|
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</term>
|
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</expression>
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<symbol> , </symbol>
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<expression>
|
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<term>
|
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<identifier> x </identifier>
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</term>
|
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</expression>
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<symbol> , </symbol>
|
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<expression>
|
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<term>
|
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<identifier> y </identifier>
|
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</term>
|
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</expression>
|
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</expressionList>
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<symbol> ) </symbol>
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<symbol> ; </symbol>
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</doStatement>
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<returnStatement>
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<keyword> return </keyword>
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<symbol> ; </symbol>
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</returnStatement>
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</statements>
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<symbol> } </symbol>
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</subroutineBody>
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</subroutineDec>
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<subroutineDec>
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<keyword> method </keyword>
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<keyword> void </keyword>
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<identifier> erase </identifier>
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<symbol> ( </symbol>
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<parameterList>
|
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</parameterList>
|
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<symbol> ) </symbol>
|
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<subroutineBody>
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<symbol> { </symbol>
|
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<statements>
|
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<doStatement>
|
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<keyword> do </keyword>
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<identifier> Screen </identifier>
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<symbol> . </symbol>
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<identifier> setColor </identifier>
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<symbol> ( </symbol>
|
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<expressionList>
|
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<expression>
|
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<term>
|
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<identifier> x </identifier>
|
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</term>
|
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</expression>
|
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</expressionList>
|
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<symbol> ) </symbol>
|
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<symbol> ; </symbol>
|
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</doStatement>
|
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<doStatement>
|
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<keyword> do </keyword>
|
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<identifier> Screen </identifier>
|
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<symbol> . </symbol>
|
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<identifier> drawRectangle </identifier>
|
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<symbol> ( </symbol>
|
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<expressionList>
|
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<expression>
|
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<term>
|
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<identifier> x </identifier>
|
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</term>
|
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</expression>
|
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<symbol> , </symbol>
|
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<expression>
|
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<term>
|
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<identifier> y </identifier>
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</term>
|
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</expression>
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||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> incSize </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> erase </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> size </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> size </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> draw </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> decSize </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> size </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> erase </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> size </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> size </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> draw </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> moveUp </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> y </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> moveDown </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> y </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> moveLeft </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> x </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> moveRight </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> x </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> setColor </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Screen </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> drawRectangle </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> x </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> , </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> y </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<symbol> } </symbol>
|
||||
</class>
|
||||
|
|
@ -0,0 +1,544 @@
|
|||
<class>
|
||||
<keyword> class </keyword>
|
||||
<identifier> SquareGame </identifier>
|
||||
<symbol> { </symbol>
|
||||
<classVarDec>
|
||||
<keyword> field </keyword>
|
||||
<identifier> Square </identifier>
|
||||
<identifier> square </identifier>
|
||||
<symbol> ; </symbol>
|
||||
</classVarDec>
|
||||
<classVarDec>
|
||||
<keyword> field </keyword>
|
||||
<keyword> int </keyword>
|
||||
<identifier> direction </identifier>
|
||||
<symbol> ; </symbol>
|
||||
</classVarDec>
|
||||
<subroutineDec>
|
||||
<keyword> constructor </keyword>
|
||||
<identifier> SquareGame </identifier>
|
||||
<identifier> new </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> square </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> direction </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> square </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> dispose </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> dispose </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Memory </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> deAlloc </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> square </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> moveSquare </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> moveUp </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> moveDown </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> moveLeft </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> square </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> moveRight </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> Sys </identifier>
|
||||
<symbol> . </symbol>
|
||||
<identifier> wait </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> direction </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
<returnStatement>
|
||||
<keyword> return </keyword>
|
||||
<symbol> ; </symbol>
|
||||
</returnStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</subroutineBody>
|
||||
</subroutineDec>
|
||||
<subroutineDec>
|
||||
<keyword> method </keyword>
|
||||
<keyword> void </keyword>
|
||||
<identifier> run </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<parameterList>
|
||||
</parameterList>
|
||||
<symbol> ) </symbol>
|
||||
<subroutineBody>
|
||||
<symbol> { </symbol>
|
||||
<varDec>
|
||||
<keyword> var </keyword>
|
||||
<keyword> char </keyword>
|
||||
<identifier> key </identifier>
|
||||
<symbol> ; </symbol>
|
||||
</varDec>
|
||||
<varDec>
|
||||
<keyword> var </keyword>
|
||||
<keyword> boolean </keyword>
|
||||
<identifier> exit </identifier>
|
||||
<symbol> ; </symbol>
|
||||
</varDec>
|
||||
<statements>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> exit </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> key </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<whileStatement>
|
||||
<keyword> while </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> exit </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<whileStatement>
|
||||
<keyword> while </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> key </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> key </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> key </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
<doStatement>
|
||||
<keyword> do </keyword>
|
||||
<identifier> moveSquare </identifier>
|
||||
<symbol> ( </symbol>
|
||||
<expressionList>
|
||||
</expressionList>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> ; </symbol>
|
||||
</doStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</whileStatement>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> key </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
<letStatement>
|
||||
<keyword> let </keyword>
|
||||
<identifier> exit </identifier>
|
||||
<symbol> = </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> exit </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ; </symbol>
|
||||
</letStatement>
|
||||
</statements>
|
||||
<symbol> } </symbol>
|
||||
</ifStatement>
|
||||
<ifStatement>
|
||||
<keyword> if </keyword>
|
||||
<symbol> ( </symbol>
|
||||
<expression>
|
||||
<term>
|
||||
<identifier> key </identifier>
|
||||
</term>
|
||||
</expression>
|
||||
<symbol> ) </symbol>
|
||||
<symbol> { </symbol>
|
||||
<statements>
|
||||
| ||||