public void Keyword_ShouldNotEndWithDot() {
ExpressionTokenizer et = new ExpressionTokenizer();
try {
et.InitTokenizer("abc.");
Assert.Fail();
} catch (ExpressionParseException) {
}
}
public void CheckSyntax(string s) {
_tokenizer = new ExpressionTokenizer();
_evalMode = EvalMode.ParseOnly;
_tokenizer.InitTokenizer(s);
ParseExpression();
if (_tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF) {
throw BuildParseError("Unexpected token at the end of expression", _tokenizer.CurrentPosition);
}
}
public object Evaluate(string s) {
_tokenizer = new ExpressionTokenizer();
_evalMode = EvalMode.Evaluate;
_tokenizer.InitTokenizer(s);
object val = ParseExpression();
if (_tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF) {
throw BuildParseError("Unexpected token at the end of expression", _tokenizer.CurrentPosition);
}
return val;
}
public void Keyword() {
string [] identifiers = new string[] {
"a.d",
"a-d",
"a.d",
"a\\d",
"a_d",
"_ad",
"ad5"
};
for (int i = 0; i < identifiers.Length; i++) {
string identifier = identifiers[i];
ExpressionTokenizer et = new ExpressionTokenizer();
et.InitTokenizer(identifier);
Assert.AreEqual (identifier, et.TokenText, "#A1");
Assert.AreEqual (ExpressionTokenizer.TokenType.Keyword, et.CurrentToken, "#A2:" + identifier);
et.GetNextToken();
Assert.AreEqual (identifier, et.TokenText, "#B1");
Assert.AreEqual (ExpressionTokenizer.TokenType.EOF, et.CurrentToken, "#B2:" + identifier);
}
}
/// <summary>
/// Evaluates the given expression string and returns the result
/// </summary>
/// <param name="input"></param>
/// <param name="location"></param>
/// <param name="state"></param>
/// <param name="visiting"></param>
/// <returns></returns>
private string EvaluateEmbeddedExpressions(string input, Location location, Hashtable state, Stack visiting)
{
if (input == null)
{
return(null);
}
if (input.IndexOf('$') < 0)
{
return(input);
}
try
{
StringBuilder output = new StringBuilder(input.Length);
ExpressionTokenizer tokenizer = new ExpressionTokenizer();
ExpressionEvaluator eval = new ExpressionEvaluator(this.project, this, state, visiting, this.callStack);
tokenizer.IgnoreWhitespace = false;
tokenizer.SingleCharacterMode = true;
tokenizer.InitTokenizer(input);
while (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF)
{
if (tokenizer.CurrentToken == ExpressionTokenizer.TokenType.Dollar)
{
tokenizer.GetNextToken();
if (tokenizer.CurrentToken == ExpressionTokenizer.TokenType.LeftCurlyBrace)
{
tokenizer.IgnoreWhitespace = true;
tokenizer.SingleCharacterMode = false;
tokenizer.GetNextToken();
string val = Convert.ToString(eval.Evaluate(tokenizer), CultureInfo.InvariantCulture);
output.Append(val);
tokenizer.IgnoreWhitespace = false;
if (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.RightCurlyBrace)
{
throw new ExpressionParseException("'}' expected", tokenizer.CurrentPosition.CharIndex);
}
tokenizer.SingleCharacterMode = true;
tokenizer.GetNextToken();
}
else
{
if (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.Dollar)
{
output.Append('$');
}
if (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF)
{
output.Append(tokenizer.TokenText);
tokenizer.GetNextToken();
}
}
}
else
{
output.Append(tokenizer.TokenText);
tokenizer.GetNextToken();
}
}
return(output.ToString());
}
catch (ExpressionParseException ex)
{
StringBuilder errorMessage = new StringBuilder();
string reformattedInput = input;
// replace CR, LF and TAB with a space
reformattedInput = reformattedInput.Replace('\n', ' ');
reformattedInput = reformattedInput.Replace('\r', ' ');
reformattedInput = reformattedInput.Replace('\t', ' ');
errorMessage.Append(ex.Message);
errorMessage.Append(Environment.NewLine);
string label = "Expression: ";
errorMessage.Append(label);
errorMessage.Append(reformattedInput);
int p0 = ex.StartPos;
int p1 = ex.EndPos;
if (p0 != -1 || p1 != -1)
{
errorMessage.Append(Environment.NewLine);
if (p1 == -1)
{
p1 = p0 + 1;
}
for (int i = 0; i < p0 + label.Length; ++i)
{
errorMessage.Append(' ');
}
for (int i = p0; i < p1; ++i)
{
errorMessage.Append('^');
}
}
throw new BuildException(errorMessage.ToString(), location,
ex.InnerException);
}
}
public object Evaluate(ExpressionTokenizer tokenizer)
{
_evalMode = EvalMode.Evaluate;
_tokenizer = tokenizer;
return ParseExpression();
}
protected object SafeConvert(Type returnType, object source, string description, ExpressionTokenizer.Position p0, ExpressionTokenizer.Position p1)
{
try {
//
// TODO - Convert.ChangeType() is very liberal. It allows you to convert "true" to Double (1.0).
// We shouldn't allow this. Add more cases like this here.
//
bool disallow = false;
if (source == null) {
if (returnType == typeof(string)) {
return string.Empty;
}
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
ResourceUtils.GetString("NA1045"),
description, GetSimpleTypeName(returnType)), p0, p1);
}
if (source is bool) {
if (returnType != typeof(string) && returnType != typeof(bool)) {
// boolean can only be converted to string or boolean
disallow = true;
}
}
if (returnType == typeof(bool)) {
if (!(source is string || source is bool)) {
// only string and boolean can be converted to boolean
disallow = true;
}
}
if (source is DateTime) {
if (returnType != typeof(string) && returnType != typeof(DateTime)) {
// DateTime can only be converted to string or DateTime
disallow = true;
}
}
if (returnType == typeof(DateTime)) {
if (!(source is DateTime || source is string)) {
// only string and DateTime can be converted to DateTime
disallow = true;
}
}
if (source is TimeSpan && returnType != typeof(TimeSpan)) {
// implicit conversion from TimeSpan is not supported, as
// TimeSpan does not implement IConvertible
disallow = true;
}
if (returnType == typeof(TimeSpan) && !(source is TimeSpan)) {
// implicit conversion to TimeSpan is not supported
disallow = true;
}
if (returnType == typeof(string)) {
if (source is DirectoryInfo) {
return ((DirectoryInfo) source).FullName;
} else if (source is FileInfo) {
return ((FileInfo) source).FullName;
}
}
if (returnType.IsEnum) {
string sourceText = source as string;
if (sourceText != null) {
// support both ',' and ' ' as separator chars for flags
string[] flags = sourceText.Split(' ', ',');
StringBuilder sb = new StringBuilder(sourceText.Length);
for (int i = 0; i < flags.Length; i++) {
string flag = flags[i].Trim();
if (flag.Length == 0)
continue;
if (sb.Length > 0)
sb.Append(',');
sb.Append(flag);
}
return Enum.Parse(returnType, sb.ToString(), true);
} else {
return Enum.ToObject(returnType, source);
}
}
if (disallow) {
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
"Cannot convert {0} to '{1}' (actual type was '{2}').",
description, GetSimpleTypeName(returnType),
GetSimpleTypeName(source.GetType())), p0, p1);
}
return Convert.ChangeType(source, returnType, CultureInfo.InvariantCulture);
} catch (ExpressionParseException) {
throw;
} catch (Exception ex) {
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
"Cannot convert {0} to '{1}' (actual type was '{2}').",
description, GetSimpleTypeName(returnType),
GetSimpleTypeName(source.GetType())), p0, p1, ex);
}
}
protected ExpressionParseException BuildParseError(string desc, ExpressionTokenizer.Position p0, ExpressionTokenizer.Position p1, Exception ex)
{
return new ExpressionParseException(desc, p0.CharIndex, p1.CharIndex, ex);
}
/// <summary>
/// Evaluates the given expression string and returns the result
/// </summary>
/// <param name="input"></param>
/// <param name="location"></param>
/// <param name="state"></param>
/// <param name="visiting"></param>
/// <returns></returns>
private string EvaluateEmbeddedExpressions(string input, Location location, Hashtable state, Stack visiting)
{
if (input == null) {
return null;
}
if (input.IndexOf('$') < 0) {
return input;
}
try {
StringBuilder output = new StringBuilder(input.Length);
ExpressionTokenizer tokenizer = new ExpressionTokenizer();
ExpressionEvaluator eval = new ExpressionEvaluator(Project, this, state, visiting);
tokenizer.IgnoreWhitespace = false;
tokenizer.SingleCharacterMode = true;
tokenizer.InitTokenizer(input);
while (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF) {
if (tokenizer.CurrentToken == ExpressionTokenizer.TokenType.Dollar) {
tokenizer.GetNextToken();
if (tokenizer.CurrentToken == ExpressionTokenizer.TokenType.LeftCurlyBrace) {
tokenizer.IgnoreWhitespace = true;
tokenizer.SingleCharacterMode = false;
tokenizer.GetNextToken();
string val = Convert.ToString(eval.Evaluate(tokenizer), CultureInfo.InvariantCulture);
output.Append(val);
tokenizer.IgnoreWhitespace = false;
if (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.RightCurlyBrace) {
throw new ExpressionParseException("'}' expected", tokenizer.CurrentPosition.CharIndex);
}
tokenizer.SingleCharacterMode = true;
tokenizer.GetNextToken();
} else {
output.Append('$');
if (tokenizer.CurrentToken != ExpressionTokenizer.TokenType.EOF) {
output.Append(tokenizer.TokenText);
tokenizer.GetNextToken();
}
}
} else {
output.Append(tokenizer.TokenText);
tokenizer.GetNextToken();
}
}
return output.ToString();
} catch (ExpressionParseException ex) {
StringBuilder errorMessage = new StringBuilder();
string reformattedInput = input;
// replace CR, LF and TAB with a space
reformattedInput = reformattedInput.Replace('\n', ' ');
reformattedInput = reformattedInput.Replace('\r', ' ');
reformattedInput = reformattedInput.Replace('\t', ' ');
errorMessage.Append(ex.Message);
errorMessage.Append(Environment.NewLine);
string label = "Expression: ";
errorMessage.Append(label);
errorMessage.Append(reformattedInput);
int p0 = ex.StartPos;
int p1 = ex.EndPos;
if (p0 != -1 || p1 != -1) {
errorMessage.Append(Environment.NewLine);
if (p1 == -1)
p1 = p0 + 1;
for (int i = 0; i < p0 + label.Length; ++i)
errorMessage.Append(' ');
for (int i = p0; i < p1; ++i)
errorMessage.Append('^');
}
throw new BuildException(errorMessage.ToString(), location,
ex.InnerException);
}
}
protected object SafeConvert(Type returnType, object source, string description, ExpressionTokenizer.Position p0, ExpressionTokenizer.Position p1)
{
try {
//
// TODO - Convert.ChangeType() is very liberal. It allows you to convert "true" to Double (1.0).
// We shouldn't allow this. Add more cases like this here.
//
bool disallow = false;
if (source == null) {
if (returnType == typeof(string)) {
return string.Empty;
}
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
ResourceUtils.GetString("NA1045"),
description, GetSimpleTypeName(returnType)), p0, p1);
}
if (source is bool) {
if (returnType != typeof(string) && returnType != typeof(bool)) {
// boolean can only be converted to string or boolean
disallow = true;
}
}
if (returnType == typeof(bool)) {
if (!(source is string || source is bool)) {
// only string and boolean can be converted to boolean
disallow = true;
}
}
if (source is DateTime) {
if (returnType != typeof(string) && returnType != typeof(DateTime)) {
// DateTime can only be converted to string or DateTime
disallow = true;
}
}
if (returnType == typeof(DateTime)) {
if (!(source is DateTime || source is string)) {
// only string and DateTime can be converted to DateTime
disallow = true;
}
}
if (source is TimeSpan && returnType != typeof(TimeSpan)) {
// implicit conversion from TimeSpan is not supported, as
// TimeSpan does not implement IConvertible
disallow = true;
}
if (returnType == typeof(TimeSpan) && !(source is TimeSpan)) {
// implicit conversion to TimeSpan is not supported
disallow = true;
}
if (returnType == typeof(string)) {
if (source is DirectoryInfo) {
return ((DirectoryInfo) source).FullName;
} else if (source is FileInfo) {
return ((FileInfo) source).FullName;
}
}
if (returnType.IsEnum) {
if (source is string) {
return Enum.Parse(returnType, (string) source, false);
} else {
return Enum.ToObject(returnType, source);
}
}
if (disallow) {
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
"Cannot convert {0} to '{1}' (actual type was '{2}').",
description, GetSimpleTypeName(returnType),
GetSimpleTypeName(source.GetType())), p0, p1);
}
return Convert.ChangeType(source, returnType, CultureInfo.InvariantCulture);
} catch (ExpressionParseException) {
throw;
} catch (Exception ex) {
throw BuildParseError(string.Format(CultureInfo.InvariantCulture,
"Cannot convert {0} to '{1}' (actual type was '{2}').",
description, GetSimpleTypeName(returnType),
GetSimpleTypeName(source.GetType())), p0, p1, ex);
}
}
