/// <summary>
/// Parses the command line arguments.
/// </summary>
public void Parse(int initPos, bool xlatStrings)
{
string MethodName = "CommandLine.Parse";
bool Done = false;
char Ch;
bool ParamIsOptional = false;
int TemplPtr = 0;
CmdLinePtr = initPos;
LogWrite(MethodName + ": Parsing \"" + this.Text + "\" using template, \"" + Template +
"\" starting at CharPos " + initPos.ToString() + ".");
LogWrite(MethodName + ": IgnoringExtraneousText = " + IgnoringExtraneousText);
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
int State = 0;
ToState(ref State, 1, MethodName);
while (!Done)
{
switch (State)
{
case 1:
Ch = GetNextChar(Template, ref TemplPtr);
switch (Ch)
{
case 'n':
ToState(ref State, 2, MethodName);
break;
case 's':
ToState(ref State, 3, MethodName);
break;
case '[':
ParamIsOptional = true;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
break;
case ']':
// do nothing
break;
case '.':
ToState(ref State, 4, MethodName);
break;
case '/':
// switch encountered
ToState(ref State, 7, MethodName);
break;
case '\0':
// end of template encountered
ToState(ref State, 5, MethodName);
break;
case ' ':
// Ignore and keep scanning...
break;
case '\t':
// Ignore and keep scanning...
break;
default:
// Invalid template character.
throw new PipeWrenchEngineException("Template is invalid.");
}
break;
case 2:
// An integer is expected according to the template.
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if ("0123456789-+".IndexOf(Ch) != -1)
{
// Found an integer. Back up a character and parse it:
CmdLinePtr--;
string Token = "";
while ((CmdLinePtr < this.Text.Length) && (this.Text[CmdLinePtr] != ' ') &&
(this.Text[CmdLinePtr] != '\t'))
{
Token += this.Text[CmdLinePtr];
CmdLinePtr++;
}
try
{
// Convert the token to an integer value:
int Value = Convert.ToInt32(Token);
LogWrite(MethodName + ": IntArg value = " + Value.ToString());
Argument arg = new Argument(Value, CmdLinePtr);
Args.Add(arg);
}
catch (Exception)
{
PipeWrenchCompileException ex = new PipeWrenchCompileException("Integer value is invalid.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
if (ParamIsOptional)
{
// Found first parameter in optional
// sequence. Now all other parameters
// to end of sequence are required.
ParamIsOptional = false;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
}
ToState(ref State, 1, MethodName);
}
else
{
if (Ch == '\'')
{
// String encountered instead of an integer.
PipeWrenchCompileException ex = new PipeWrenchCompileException("Integer expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
else
{
if (Ch == '/')
{
// Switch encountered instead of an integer.
if (ParamIsOptional)
{
ToState(ref State, 6, MethodName);
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected an integer parameter but switch was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if (Ch == '\0')
{
// Reached the end of the command line.
if (ParamIsOptional)
{
Done = true;
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected an integer parameter but end-of-line was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Integer expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
}
}
break;
case 3:
// A string is expected according to the template.
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if (Ch == '\'')
{
// Found a string. Back up and parse it:
CmdLinePtr--;
string Token;
if (xlatStrings)
{
string tempStr = GetString(this.Text, ref iCmdLinePtr, '\'', true);
try
{
Token = XlatEscapes(tempStr);
}
catch (PipeWrenchCompileException ex)
{
ex.Data.Add("CmdLine", this.Text);
ex.Data["CharPos"] = CmdLinePtr - tempStr.Length + (int) ex.Data["Offset"];
throw ex;
}
}
else
{
Token = GetString(this.Text, ref iCmdLinePtr, '\'', false);
}
Argument arg = new Argument(Token, iCmdLinePtr);
Args.Add(arg);
if (ParamIsOptional)
{
// Found first parameter in optional sequence. Now all other
// parameters to end of sequence are required.
ParamIsOptional = false;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
}
ToState(ref State, 1, MethodName);
}
else
{
if ("0123456789-+".IndexOf(Ch) != -1)
{
// An integer was encountered.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("String expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
else
{
if (Ch == '/')
{
// A switch was encountered.
if (ParamIsOptional)
{
ToState(ref State, 6, MethodName);
}
else
{
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected a string parameter but switch was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if (Ch == '\0')
{
// Reached the end of the command line.
if (ParamIsOptional)
{
Done = true;
}
else
{
// Expected string value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected a string parameter but end-of-line was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
// Expected string value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("String expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
}
}
break;
case 4:
// Backtracking through optional sequence.
int savedTemplPtr = TemplPtr;
try
{
while (Template[TemplPtr] != '[')
{
TemplPtr--;
}
}
catch (Exception)
{
PipeWrenchTemplateException ex =
new PipeWrenchTemplateException(
"Template error: Repeating group (...) is only allowed inside \"[]\".");
ex.Data.Add("CharPos", savedTemplPtr);
ex.Data.Add("Template", Template);
throw ex;
}
TemplPtr++;
ParamIsOptional = true;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
ToState(ref State, 1, MethodName);
break;
case 5:
// End of template encountered.
if (!IgnoringExtraneousText)
{
// Be sure that remainder of command line is clear
// as additional parameters, (including switches)
// are not expected:
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if (Ch == '\0')
{
Done = true;
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Parameter or switch is extraneous.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
else
{
Done = true;
}
break;
case 6:
// Switch encountered.
if (CmdLinePtr < this.Text.Length)
{
// Not yet to the end of the command line.
string SwitchID = "/" + Char.ToUpper(this.Text[CmdLinePtr]);
CmdLinePtr++;
ParseSwitch(SwitchID, ref iCmdLinePtr, ref TemplPtr, xlatStrings);
ToState(ref State, 7, MethodName);
}
else
{
// End of command line was encountered. Switch
// character, (/) was found without a succeeding
// ID character.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Switch is incomplete.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
break;
case 7:
// Locate the next switch on the command line:
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
switch (Ch)
{
case '/':
// Found it.
ToState(ref State, 6, MethodName);
break;
case '\0':
Done = true;
break;
case ' ':
// Whitespace character. Just ignore it and keep scanning...
break;
case '\t':
// Whitespace character. Just ignore it and keep scanning...
break;
default:
PipeWrenchCompileException ex =
new PipeWrenchCompileException("A switch was expected.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
break;
default:
throw new PipeWrenchEngineException(MethodName +
": Invalid state (" + State.ToString() + ").");
}
}
}
/// <summary>
/// Parses the command line arguments.
/// </summary>
public void Parse(int initPos, bool xlatStrings)
{
string MethodName = "CommandLine.Parse";
bool Done = false;
char Ch;
bool ParamIsOptional = false;
int TemplPtr = 0;
CmdLinePtr = initPos;
LogWrite(MethodName + ": Parsing \"" + this.Text + "\" using template, \"" + Template +
"\" starting at CharPos " + initPos.ToString() + ".");
LogWrite(MethodName + ": IgnoringExtraneousText = " + IgnoringExtraneousText);
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
int State = 0;
ToState(ref State, 1, MethodName);
while (!Done)
{
switch (State)
{
case 1:
Ch = GetNextChar(Template, ref TemplPtr);
switch (Ch)
{
case 'n':
ToState(ref State, 2, MethodName);
break;
case 's':
ToState(ref State, 3, MethodName);
break;
case '[':
ParamIsOptional = true;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
break;
case ']':
// do nothing
break;
case '.':
ToState(ref State, 4, MethodName);
break;
case '/':
// switch encountered
ToState(ref State, 7, MethodName);
break;
case '\0':
// end of template encountered
ToState(ref State, 5, MethodName);
break;
case ' ':
// Ignore and keep scanning...
break;
case '\t':
// Ignore and keep scanning...
break;
default:
// Invalid template character.
throw new PipeWrenchEngineException("Template is invalid.");
}
break;
case 2:
// An integer is expected according to the template.
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if ("0123456789-+".IndexOf(Ch) != -1)
{
// Found an integer. Back up a character and parse it:
CmdLinePtr--;
string Token = "";
while ((CmdLinePtr < this.Text.Length) && (this.Text[CmdLinePtr] != ' ') &&
(this.Text[CmdLinePtr] != '\t'))
{
Token += this.Text[CmdLinePtr];
CmdLinePtr++;
}
try
{
// Convert the token to an integer value:
int Value = Convert.ToInt32(Token);
LogWrite(MethodName + ": IntArg value = " + Value.ToString());
Argument arg = new Argument(Value, CmdLinePtr);
Args.Add(arg);
}
catch (Exception)
{
PipeWrenchCompileException ex = new PipeWrenchCompileException("Integer value is invalid.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
if (ParamIsOptional)
{
// Found first parameter in optional
// sequence. Now all other parameters
// to end of sequence are required.
ParamIsOptional = false;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
}
ToState(ref State, 1, MethodName);
}
else
{
if (Ch == '\'')
{
// String encountered instead of an integer.
PipeWrenchCompileException ex = new PipeWrenchCompileException("Integer expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
else
{
if (Ch == '/')
{
// Switch encountered instead of an integer.
if (ParamIsOptional)
{
ToState(ref State, 6, MethodName);
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected an integer parameter but switch was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if (Ch == '\0')
{
// Reached the end of the command line.
if (ParamIsOptional)
{
Done = true;
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected an integer parameter but end-of-line was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
// Expected integer value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Integer expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
}
}
break;
case 3:
// A string is expected according to the template.
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if (Ch == '\'')
{
// Found a string. Back up and parse it:
CmdLinePtr--;
string Token;
if (xlatStrings)
{
string tempStr = GetString(this.Text, ref iCmdLinePtr, '\'', true);
try
{
Token = XlatEscapes(tempStr);
}
catch (PipeWrenchCompileException ex)
{
ex.Data.Add("CmdLine", this.Text);
ex.Data["CharPos"] = CmdLinePtr - tempStr.Length + (int)ex.Data["Offset"];
throw ex;
}
}
else
{
Token = GetString(this.Text, ref iCmdLinePtr, '\'', false);
}
Argument arg = new Argument(Token, iCmdLinePtr);
Args.Add(arg);
if (ParamIsOptional)
{
// Found first parameter in optional sequence. Now all other
// parameters to end of sequence are required.
ParamIsOptional = false;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
}
ToState(ref State, 1, MethodName);
}
else
{
if ("0123456789-+".IndexOf(Ch) != -1)
{
// An integer was encountered.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("String expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
else
{
if (Ch == '/')
{
// A switch was encountered.
if (ParamIsOptional)
{
ToState(ref State, 6, MethodName);
}
else
{
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected a string parameter but switch was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if (Ch == '\0')
{
// Reached the end of the command line.
if (ParamIsOptional)
{
Done = true;
}
else
{
// Expected string value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Expected a string parameter but end-of-line was encountered.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
// Expected string value was not found.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("String expected for this parameter.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
}
}
break;
case 4:
// Backtracking through optional sequence.
int savedTemplPtr = TemplPtr;
try
{
while (Template[TemplPtr] != '[')
{
TemplPtr--;
}
}
catch (Exception)
{
PipeWrenchTemplateException ex =
new PipeWrenchTemplateException(
"Template error: Repeating group (...) is only allowed inside \"[]\".");
ex.Data.Add("CharPos", savedTemplPtr);
ex.Data.Add("Template", Template);
throw ex;
}
TemplPtr++;
ParamIsOptional = true;
LogWrite(MethodName + ": ParamIsOptional = " + ParamIsOptional);
ToState(ref State, 1, MethodName);
break;
case 5:
// End of template encountered.
if (!IgnoringExtraneousText)
{
// Be sure that remainder of command line is clear
// as additional parameters, (including switches)
// are not expected:
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
if (Ch == '\0')
{
Done = true;
}
else
{
if ((Ch == ' ') || (Ch == '\t'))
{
// It's a whitespace character. Just ignore it and keep scanning...
}
else
{
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Parameter or switch is extraneous.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
}
}
else
{
Done = true;
}
break;
case 6:
// Switch encountered.
if (CmdLinePtr < this.Text.Length)
{
// Not yet to the end of the command line.
string SwitchID = "/" + Char.ToUpper(this.Text[CmdLinePtr]);
CmdLinePtr++;
ParseSwitch(SwitchID, ref iCmdLinePtr, ref TemplPtr, xlatStrings);
ToState(ref State, 7, MethodName);
}
else
{
// End of command line was encountered. Switch
// character, (/) was found without a succeeding
// ID character.
PipeWrenchCompileException ex =
new PipeWrenchCompileException("Switch is incomplete.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
break;
case 7:
// Locate the next switch on the command line:
Ch = GetNextChar(this.Text, ref iCmdLinePtr);
switch (Ch)
{
case '/':
// Found it.
ToState(ref State, 6, MethodName);
break;
case '\0':
Done = true;
break;
case ' ':
// Whitespace character. Just ignore it and keep scanning...
break;
case '\t':
// Whitespace character. Just ignore it and keep scanning...
break;
default:
PipeWrenchCompileException ex =
new PipeWrenchCompileException("A switch was expected.");
ex.Data.Add("CharPos", CmdLinePtr);
ex.Data.Add("CmdLine", this.Text);
throw ex;
}
break;
default:
throw new PipeWrenchEngineException(MethodName +
": Invalid state (" + State.ToString() + ").");
}
}
}
