public SaneOptionCollection Parse(StreamReader streamReader)
{
input = streamReader;
options = new SaneOptionCollection();
state = OptionParseState.NonDeviceOptions;
line = null;
NextLine();
while (line != null)
{
switch (state)
{
case OptionParseState.NonDeviceOptions:
if (line.StartsWith("Options specific to device", StringComparison.InvariantCultureIgnoreCase))
{
state = OptionParseState.LookingForOption;
}
NextLine();
break;
case OptionParseState.LookingForOption:
if (line.StartsWith(" -", StringComparison.InvariantCultureIgnoreCase))
{
ParseOption();
state = OptionParseState.ReadingDescription;
}
NextLine();
break;
case OptionParseState.ReadingDescription:
if (line.StartsWith(" ", StringComparison.InvariantCultureIgnoreCase))
{
string descLine = line.Substring(8).Trim();
if (lastOption.Desc == null)
{
lastOption.Desc = descLine;
}
else
{
lastOption.Desc += " " + descLine;
}
NextLine();
}
else
{
state = OptionParseState.LookingForOption;
}
break;
}
}
return(options);
}
private void ParseOption()
{
int i = 4;
var option = new SaneOption
{
Capabilities = SaneCapabilities.SoftSelect
};
var optionValueList = new List <string>();
var builder = new StringBuilder();
state = OptionParseState.ReadingName;
while (i < line.Length)
{
char c = line[i];
switch (state)
{
case OptionParseState.ReadingName:
if (char.IsLetter(c) || c == '-')
{
builder.Append(c);
i += 1;
break;
}
option.Name = builder.ToString();
builder.Clear();
if (c == '[')
{
option.Type = SaneValueType.Bool;
i += 3;
state = OptionParseState.ReadingBooleanValues;
}
else if (c == ' ')
{
i += 1;
state = OptionParseState.ReadingValues;
}
else if (c == '\n')
{
option.Type = SaneValueType.Button;
i += 1;
}
else
{
return;
}
break;
case OptionParseState.ReadingBooleanValues:
if (c == 'a')
{
option.Capabilities |= SaneCapabilities.Automatic;
i += 1;
}
else if (c == ')')
{
i += 1;
}
else
{
i += 1;
}
break;
case OptionParseState.ReadingValues:
if (char.IsLetterOrDigit(c) || c == '.' || c == '%')
{
builder.Append(c);
i += 1;
break;
}
string optionValue = builder.ToString();
builder.Clear();
if (c == ' ' || c == '\n')
{
foreach (var unitKvp in Units)
{
if (optionValue.EndsWith(unitKvp.Key, StringComparison.InvariantCultureIgnoreCase))
{
optionValue = optionValue.Substring(0, optionValue.Length - unitKvp.Key.Length);
option.Unit = unitKvp.Value;
break;
}
}
}
else if (line.Substring(i, 4) == ",...")
{
option.Type = SaneValueType.Group;
i += 3;
}
else if (c != '|')
{
return;
}
if (optionValue == "auto")
{
option.Capabilities |= SaneCapabilities.Automatic;
}
else if (optionValue.Contains(".."))
{
var parts = optionValue.Split(new[] { ".." }, StringSplitOptions.None);
if (!decimal.TryParse(parts[0], out var min) || !decimal.TryParse(parts[1], out var max))
{
return;
}
if (option.Type == SaneValueType.None)
{
option.Type = SaneValueType.Numeric;
}
option.ConstraintType = SaneConstraintType.Range;
option.Range = new SaneRange
{
Min = min,
Max = max
};
}
else
{
if (option.Type == SaneValueType.None)
{
// Assume numeric until proven otherwise
option.Type = SaneValueType.Numeric;
option.ConstraintType = SaneConstraintType.WordList;
}
if (optionValue.Any(c1 => !char.IsDigit(c1) && c1 != '.'))
{
option.Type = SaneValueType.String;
option.ConstraintType = SaneConstraintType.StringList;
}
if (optionValue != "")
{
optionValueList.Add(optionValue);
}
}
if (c == ' ')
{
if (option.ConstraintType == SaneConstraintType.WordList)
{
option.WordList = optionValueList.Select(decimal.Parse).ToList();
}
if (option.ConstraintType == SaneConstraintType.StringList)
{
option.StringList = optionValueList;
}
state = option.ConstraintType == SaneConstraintType.Range ? OptionParseState.LookingForQuant : OptionParseState.LookingForDefaultValue;
}
i += 1;
break;
case OptionParseState.LookingForQuant:
if (c == ' ')
{
i += 1;
break;
}
if (c == '[')
{
state = OptionParseState.LookingForDefaultValue;
break;
}
if (c == '\n')
{
i += 1;
break;
}
if (line.Substring(i, 13) != "(in steps of ")
{
return;
}
i += 13;
state = OptionParseState.ReadingQuant;
break;
case OptionParseState.ReadingQuant:
if (c != ')')
{
builder.Append(c);
i += 1;
break;
}
if (!decimal.TryParse(builder.ToString(), out var quant))
{
return;
}
builder.Clear();
option.Range.Quant = quant;
i += 1;
state = OptionParseState.LookingForDefaultValue;
break;
case OptionParseState.LookingForDefaultValue:
if (c == ' ')
{
i += 1;
break;
}
if (c == '\n')
{
i += 1;
break;
}
if (c != '[')
{
return;
}
i += 1;
state = OptionParseState.ReadingDefaultValue;
break;
case OptionParseState.ReadingDefaultValue:
if (c != ']')
{
builder.Append(c);
i += 1;
break;
}
string current = builder.ToString();
builder.Clear();
if (current == "inactive")
{
option.Capabilities |= SaneCapabilities.Inactive;
}
else if (current == "hardware")
{
option.Capabilities |= SaneCapabilities.HardSelect;
}
else if (current == "read-only")
{
option.Capabilities &= ~SaneCapabilities.SoftSelect;
option.Capabilities |= SaneCapabilities.SoftDetect;
}
else if (option.Type == SaneValueType.Numeric)
{
if (!decimal.TryParse(current, out var currentNumeric))
{
return;
}
option.CurrentNumericValue = currentNumeric;
}
else
{
option.CurrentStringValue = current;
}
i += 1;
state = OptionParseState.Idle;
break;
case OptionParseState.Idle:
i += 1;
break;
}
}
options.Add(option);
lastOption = option;
state = OptionParseState.ReadingDescription;
}