private SLabeledStatement ParseWhileStatement(Queue <PMatchedData> matchedData)
{
var currTokens = matchedData.Dequeue().GetTokens();
int i;
if (currTokens[0].TokenType != PTokenType.While)
{
throw new ArgumentException("matchedData should start with a while statement!", nameof(matchedData));
}
var conditionExpression = new SExpression(GetText(currTokens, 2, currTokens.Length - 1));
var loopStatement = ParseStatement(matchedData);
var nextStatement = loopStatement.NextStatement;
var breakTarget = new SLabeledStatement("while-loop: break target", null, nextStatement)
{
Visible = false
};
var continueLoop = new SJumpStatement("continue", null);
loopStatement.SetNextStatement(continueLoop);
continueLoop.Visible = false;
var continueTarget = new SLabeledStatement("while-loop: continue target", null, new SConditionalStatement(
conditionExpression,
new SCompoundStatement(new[] { loopStatement, continueLoop }, null),
breakTarget
))
{
Visible = false
};
continueLoop.SetTargetStatement(continueTarget);
for (i = 0; i < _breakJumps.Count; i++)
{
if (continueTarget.Contains(_breakJumps[i]))
{
_breakJumps[i].SetTargetStatement(breakTarget);
_breakJumps.RemoveAt(i);
i--;
}
}
for (i = 0; i < _continueJumps.Count; i++)
{
if (continueTarget.Contains(_continueJumps[i]))
{
_continueJumps[i].SetTargetStatement(continueTarget);
_continueJumps.RemoveAt(i);
i--;
}
}
return(continueTarget);
}
private SLabeledStatement ParseLabeledStatement(Queue <PMatchedData> matchedData)
{
var currTokens = matchedData.Dequeue().GetTokens();
var labelName = currTokens[0].TokenCode;
SExpression caseExpression = null;
var labeled = ParseStatement(matchedData);
if (labelName == "case")
{
caseExpression = new SExpression(GetText(currTokens, 1, currTokens.Length - 1));
}
if (labeled == null)
{
throw new InvalidOperationException("error: label at end of compound statement!");
}
var result = new SLabeledStatement(labelName, caseExpression, labeled);
if (labelName == "case" || labelName == "default")
{
_caseLabels.Add(result);
}
else
{
int i;
for (i = 0; i < _gotoJumps.Count; i++)
{
if (_gotoJumps[i].TargetIdentifier == labelName)
{
_gotoJumps[i].SetTargetStatement(result);
_gotoJumps.RemoveAt(i);
return(result);
}
}
_labels.Add(result);
}
return(result);
}
private SCompoundStatement ParseForStatement(Queue <PMatchedData> matchedData)
{
var currTokens = matchedData.Dequeue().GetTokens();
int i, j;
if (currTokens[0].TokenType != PTokenType.For)
{
throw new ArgumentException("matchedData should start with a for statement!", nameof(matchedData));
}
for (i = 0; i < currTokens.Length && currTokens[i].TokenCode != ";"; i++)
{
;
}
var startExpression = new SExpression(GetText(currTokens, 2, i));
for (j = i + 1; j < currTokens.Length && currTokens[j].TokenCode != ";"; j++)
{
;
}
var conditionExpression = new SExpression(GetText(currTokens, i + 1, j));
var iterationExpression = new SExpression(GetText(currTokens, j + 1, currTokens.Length - 1));
var loopStatement = ParseStatement(matchedData);
var nextStatement = loopStatement.NextStatement;
var breakTarget = new SLabeledStatement("for-loop: break target", null, nextStatement)
{
Visible = false
};
var continueLoop = new SJumpStatement("for-loop: next iteration", null)
{
Visible = false
};
var iteration = new SExpressionStatement(iterationExpression, continueLoop)
{
Visible = false
};
var continueTarget = new SLabeledStatement("for-loop: continue target", null, iteration)
{
Visible = false
};
loopStatement.SetNextStatement(continueTarget);
var iterationStart = new SLabeledStatement("for-loop: iteration start", null, new SConditionalStatement(
conditionExpression,
new SCompoundStatement(new[]
{
loopStatement,
continueTarget,
continueLoop
}, null),
null
))
{
Visible = false
};
continueLoop.SetTargetStatement(iterationStart);
for (i = 0; i < _breakJumps.Count; i++)
{
if (loopStatement.Contains(_breakJumps[i]))
{
_breakJumps[i].SetTargetStatement(breakTarget);
_breakJumps.RemoveAt(i);
i--;
}
}
for (i = 0; i < _continueJumps.Count; i++)
{
if (loopStatement.Contains(_continueJumps[i]))
{
_continueJumps[i].SetTargetStatement(continueTarget);
_continueJumps.RemoveAt(i);
i--;
}
}
var cExpression = new SExpressionStatement(startExpression, iterationStart)
{
Visible = false
};
return(new SCompoundStatement(
new SStatement[]
{
cExpression,
iterationStart
},
breakTarget));
}
private SCompoundStatement ParseDoWhileStatement(Queue <PMatchedData> matchedData)
{
var currTokens = matchedData.Dequeue().GetTokens();
SStatement nextStatement;
int i;
if (currTokens[0].TokenType != PTokenType.Do)
{
throw new ArgumentException("matchedData should start with a do-while statement!", nameof(matchedData));
}
var loopStatement = ParseStatement(matchedData);
loopStatement.Visible = false;
if (loopStatement.NextStatement is SLabeledStatement &&
loopStatement.NextStatement.NextStatement is SLabeledStatement)
{
nextStatement = ((SLabeledStatement)loopStatement.NextStatement.NextStatement).LabeledStatement;
}
else
{
throw new ArgumentException("incorrect do-while statement!", nameof(matchedData));
}
var breakTarget =
new SLabeledStatement("do-while-loop: break target", null, nextStatement)
{
Visible = false
};
var continueLoop = new SJumpStatement("continue", null)
{
Visible = false
};
var continueTarget =
new SLabeledStatement("do-while-loop: continue target", null, loopStatement)
{
Visible = false
};
continueLoop.SetTargetStatement(continueTarget);
var statement = new SConditionalStatement(
((SConditionalStatement)((SLabeledStatement)loopStatement.NextStatement).LabeledStatement).Condition,
continueLoop,
null
);
loopStatement.SetNextStatement(
statement
);
for (i = 0; i < _breakJumps.Count; i++)
{
if (continueTarget.Contains(_breakJumps[i]))
{
_breakJumps[i].SetTargetStatement(breakTarget);
_breakJumps.RemoveAt(i);
i--;
}
}
for (i = 0; i < _continueJumps.Count; i++)
{
if (continueTarget.Contains(_continueJumps[i]))
{
_continueJumps[i].SetTargetStatement(continueTarget);
_continueJumps.RemoveAt(i);
i--;
}
}
var statements = new[] { continueTarget, loopStatement.NextStatement };
return(new SCompoundStatement(
statements, breakTarget
));
}