| public static EscapeShellMetacharacters ( string argument ) : string | ||
| argument | string | |
| return | string | |
private List <Replacement> BuildReplacementList(string input)
{
var index = 0;
var replacements = new List <Replacement>();
do
{
var tokenStart = input.IndexOf("%", index, StringComparison.InvariantCulture);
if (tokenStart == -1)
{
break;
}
var tokenEnd = input.IndexOf("%", tokenStart + 1, StringComparison.InvariantCulture);
if (tokenEnd == -1)
{
break;
}
var tokenLength = tokenEnd - tokenStart + 1;
var variableNameStart = tokenStart + 1;
var variableNameLength = tokenLength - 2;
var isEnvironmentVariable = false;
var variableName = "";
if (tokenStart > 0)
{
var tokenStartPrefix = input.Substring(tokenStart - 1, 1).ToCharArray()[0];
var tokenEndPrefix = input.Substring(tokenEnd - 1, 1).ToCharArray()[0];
if (tokenStartPrefix == '\\' && tokenEndPrefix == '\\')
{
isEnvironmentVariable = true;
// Add the first backslash to the token
tokenStart--;
tokenLength++;
// Remove the last backslash from the name
variableNameLength--;
}
else if (tokenStartPrefix == '^' && tokenEndPrefix == '^')
{
// Add the first caret to the token
tokenStart--;
tokenLength++;
// Remove the last caret from the name
variableNameLength--;
variableName = input.Substring(variableNameStart, variableNameLength);
replacements.Add(new Replacement(tokenStart, tokenLength, $"%{variableName}%"));
index = tokenEnd;
continue;
}
}
var token = input.Substring(tokenStart, tokenLength);
var escape = DetermineEscapeType(token);
if (escape != EscapeType.All)
{
// Remove the escape character from the name
variableNameStart++;
variableNameLength--;
}
if (variableNameLength == 0)
{
index = tokenEnd;
continue;
}
variableName = input.Substring(variableNameStart, variableNameLength);
var replacementValue = token;
if (!isEnvironmentVariable)
{
replacementValue = GetVariableReplacement(variableName, token);
}
var haveReplacement = false;
if (replacementValue != token)
{
haveReplacement = true;
}
else
{
replacementValue = Environment.GetEnvironmentVariable(variableName);
if (replacementValue != null)
{
haveReplacement = true;
}
}
if (haveReplacement)
{
var trailing = tokenEnd + 2 <= input.Length ? input.Substring(tokenEnd + 1, 1).ToCharArray()[0] : '\0';
if (escape == EscapeType.All)
{
replacementValue = CommandLineArguments.EscapeBackslashes(replacementValue);
if (trailing == '\'')
{
replacementValue = CommandLineArguments.EscapeBackslashesForTrailingQuote(replacementValue);
}
}
if (escape == EscapeType.All || escape == EscapeType.ShellMetacharacters)
{
replacementValue = CommandLineArguments.EscapeShellMetacharacters(replacementValue);
}
replacements.Add(new Replacement(tokenStart, tokenLength, replacementValue));
index = tokenEnd + 1;
}
else
{
index = tokenEnd;
}
} while (true);
return(replacements);
}
public string ParseArguments(string input)
{
int index = 0;
List <Replacement> replacements = new List <Replacement>();
do
{
int tokenStart = input.IndexOf("%", index, StringComparison.InvariantCulture);
if (tokenStart == -1)
{
break;
}
int tokenEnd = input.IndexOf("%", tokenStart + 1, StringComparison.InvariantCulture);
if (tokenEnd == -1)
{
break;
}
int tokenLength = tokenEnd - tokenStart + 1;
int variableNameStart = tokenStart + 1;
int variableNameLength = tokenLength - 2;
bool isEnvironmentVariable = false;
string variableName = "";
if (tokenStart > 0)
{
char tokenStartPrefix = input.Substring(tokenStart - 1, 1).ToCharArray()[0];
char tokenEndPrefix = input.Substring(tokenEnd - 1, 1).ToCharArray()[0];
if (tokenStartPrefix == '\\' && tokenEndPrefix == '\\')
{
isEnvironmentVariable = true;
// Add the first backslash to the token
tokenStart--;
tokenLength++;
// Remove the last backslash from the name
variableNameLength--;
}
else if (tokenStartPrefix == '^' && tokenEndPrefix == '^')
{
// Add the first caret to the token
tokenStart--;
tokenLength++;
// Remove the last caret from the name
variableNameLength--;
variableName = input.Substring(variableNameStart, variableNameLength);
replacements.Add(new Replacement(tokenStart, tokenLength, $"%{variableName}%"));
index = tokenEnd;
continue;
}
}
string token = input.Substring(tokenStart, tokenLength);
EscapeType escape = EscapeType.All;
string prefix = input.Substring(variableNameStart, 1);
switch (prefix)
{
case "-":
escape = EscapeType.ShellMetacharacters;
break;
case "!":
escape = EscapeType.None;
break;
}
if (escape != EscapeType.All)
{
// Remove the escape character from the name
variableNameStart++;
variableNameLength--;
}
if (variableNameLength == 0)
{
index = tokenEnd;
continue;
}
variableName = input.Substring(variableNameStart, variableNameLength);
string replacementValue = token;
if (!isEnvironmentVariable)
{
replacementValue = GetVariableReplacement(variableName, token);
}
bool haveReplacement = false;
if (replacementValue != token)
{
haveReplacement = true;
}
else
{
replacementValue = Environment.GetEnvironmentVariable(variableName);
if (replacementValue != null)
{
haveReplacement = true;
}
}
if (haveReplacement)
{
var trailing = tokenEnd + 2 <= input.Length ? input.Substring(tokenEnd + 1, 1).ToCharArray()[0] : '\0';
if (escape == EscapeType.All)
{
replacementValue = CommandLineArguments.EscapeBackslashes(replacementValue);
if (trailing == '\'')
{
replacementValue = CommandLineArguments.EscapeBackslashesForTrailingQuote(replacementValue);
}
}
if (escape == EscapeType.All || escape == EscapeType.ShellMetacharacters)
{
replacementValue = CommandLineArguments.EscapeShellMetacharacters(replacementValue);
}
replacements.Add(new Replacement(tokenStart, tokenLength, replacementValue));
index = tokenEnd + 1;
}
else
{
index = tokenEnd;
}
} while (true);
string result = input;
for (index = result.Length; index >= 0; index--)
{
foreach (Replacement replacement in replacements)
{
if (replacement.Start != index)
{
continue;
}
string before = result.Substring(0, replacement.Start);
string after = result.Substring(replacement.Start + replacement.Length);
result = before + replacement.Value + after;
}
}
return(result);
}