/// <summary>
/// 跳过多行注释
/// </summary>
/// <returns></returns>
protected virtual void SkipMultilineNote(AnalyzingContext context)
{
int count = context.SourceCode.Length;
while (context.NextLetterIndex < count)
{
if (context.CurrentChar() == '*')
{
context.NextLetterIndex++;
if (context.NextLetterIndex < count)
{
if (context.CurrentChar() == '/')
{
context.NextLetterIndex++;
break;
}
else
{
context.NextLetterIndex++;
}
}
}
else
{
context.NextLetterIndex++;
}
}
}
/// <summary>
/// 十进制数
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetConstentDecimalNumber(Token result, AnalyzingContext context)
{
char ch = context.CurrentChar();
StringBuilder tag = new StringBuilder();
string numberSerial1, numberSerial2, numberSerial3;
numberSerial1 = GetNumberSerial(context, 10);
tag.Append(numberSerial1);
result.LexicalError = string.IsNullOrEmpty(numberSerial1);
if (context.NextLetterIndex < context.SourceCode.Length)
{
//ch = context.CurrentChar();
if (ch == 'l' || ch == 'L')
{
tag.Append(ch);
context.NextLetterIndex++;
}
if (ch == '.')
{
tag.Append(ch);
context.NextLetterIndex++;
numberSerial2 = GetNumberSerial(context, 10);
tag.Append(numberSerial2);
result.LexicalError = result.LexicalError || string.IsNullOrEmpty(numberSerial2);
if (context.NextLetterIndex < context.SourceCode.Length)
{
ch = context.CurrentChar();
}
}
if (ch == 'e' || ch == 'E')
{
tag.Append(ch);
context.NextLetterIndex++;
if (context.NextLetterIndex < context.SourceCode.Length)
{
ch = context.CurrentChar();
if (ch == '+' || ch == '-')
{
tag.Append(ch);
context.NextLetterIndex++;
}
}
numberSerial3 = GetNumberSerial(context, 10);
tag.Append(numberSerial3);
result.LexicalError = result.LexicalError || string.IsNullOrEmpty(numberSerial3);
}
}
if (result.LexicalError)
{
result.TokenType = new TokenType("number",
string.Format("十进制数[{0}]格式错误，无法解析。", tag.ToString()),
"number");
}
else
{
result.TokenType = new TokenType("number", tag.ToString(), "number");
}
return(true);
}
/// <summary>
/// 从<code>context.NextLetterIndex</code>开始获取下一个<code>Token</code>
/// </summary>
/// <returns></returns>
protected Token NextToken(AnalyzingContext context)
{
var result = new Token();
result.Line = context.CurrentLine;
result.Column = context.CurrentColumn;
result.IndexOfSourceCode = context.NextLetterIndex;
var count = context.SourceCode.Length;
if (context.NextLetterIndex < 0 || context.NextLetterIndex >= count)
{
return(result);
}
var gotToken = false;
char ch = context.CurrentChar();
SourceCodeCharType charType = ch.GetCharType();
gotToken = TryGetToken(context, result, charType);
if (gotToken)
{
result.Length = context.NextLetterIndex - result.IndexOfSourceCode;
return(result);
}
else
{
return(null);
}
}
/// <summary>
/// 数值
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetConstentNumber(Token result, AnalyzingContext context)
{
char ch = context.CurrentChar();
if (ch == '0')//可能是八进制或十六进制数
{
if (context.NextLetterIndex + 1 < context.SourceCode.Length)
{
char c = context.SourceCode[context.NextLetterIndex + 1];
if (c == 'x' || c == 'X')
{//十六进制数
return(GetConstentHexadecimalNumber(result, context));
}
else if (ch.GetCharType() == SourceCodeCharType.Number)
{//八进制数
return(GetConstentOctonaryNumber(result, context));
}
else//十进制数
{
return(GetConstentDecimalNumber(result, context));
}
}
else
{//源代码最后一个字符 0
result.TokenType = new TokenType("number", "0", "number");
return(true);
}
}
else//十进制数
{
return(GetConstentDecimalNumber(result, context));
}
}
/// <summary>
/// 十六进制数
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetConstentHexadecimalNumber(Token result, AnalyzingContext context)
{
char c;
StringBuilder tag = new StringBuilder(context.SourceCode.Substring(context.NextLetterIndex, 2));
context.NextLetterIndex += 2;
string numberSerial = GetNumberSerial(context, 16);
tag.Append(numberSerial);
if (context.NextLetterIndex < context.SourceCode.Length)
{
c = context.CurrentChar();
if (c == 'l' || c == 'L')
{
tag.Append(c);
context.NextLetterIndex++;
}
}
if (string.IsNullOrEmpty(numberSerial))
{
result.LexicalError = true;
result.TokenType = new TokenType("number",
string.Format("十六进制数[{0}]格式错误。", tag.ToString()),
"number");
}
else
{
result.TokenType = new TokenType("number", tag.ToString(), "number");
}
return(true);
}
/// <summary>
/// 未知符号
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetUnknown(Token result, AnalyzingContext context)
{
string content = context.CurrentChar().ToString();
result.TokenType = new TokenType(
"__unknown", content, "unknown");
result.LexicalError = true;
//result.Tag = string.Format("发现未知字符[{0}]。", result.Detail);
context.NextLetterIndex++;
return(true);
}
/// <summary>
/// space tab \r \n
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetSpace(Token result, AnalyzingContext context)
{
char c = context.CurrentChar();
context.NextLetterIndex++;
if (c == '\n')// || c == '\r') //换行：Windows：\r\n Linux：\n
{
context.CurrentLine++;
context.CurrentColumn = 1;
}
return(false);
}
/// <summary>
/// 跳过单行注释
/// </summary>
/// <returns></returns>
protected virtual void SkipSingleLineNote(AnalyzingContext context)
{
int count = context.SourceCode.Length;
char cNext;
while (context.NextLetterIndex < count)
{
cNext = context.CurrentChar();
if (cNext == '\r' || cNext == '\n')
{
break;
}
context.NextLetterIndex++;
}
}
/// <summary>
/// 八进制数序列
/// </summary>
/// <param name="sourceCode"></param>
/// <returns></returns>
protected virtual string GetNumberSerialOctonary(AnalyzingContext context)
{
StringBuilder result = new StringBuilder(String.Empty);
char c;
while (context.NextLetterIndex < context.SourceCode.Length)
{
c = context.CurrentChar();
if ('0' <= c && c <= '7')
{
result.Append(c);
context.NextLetterIndex++;
}
else
{
break;
}
}
return(result.ToString());
}
/// <summary>
/// 获取标识符（函数名，变量名，等）
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
protected virtual bool GetIdentifier(Token result, AnalyzingContext context)
{
StringBuilder builder = new StringBuilder();
while (context.NextLetterIndex < context.SourceCode.Length)
{
char ch = context.CurrentChar();
var ct = ch.GetCharType();
if (ct == SourceCodeCharType.Letter ||
ct == SourceCodeCharType.Number ||
ct == SourceCodeCharType.UnderLine)
{
builder.Append(ch);
context.NextLetterIndex++;
}
else
{
break;
}
}
string content = builder.ToString();
// specify if this string is a keyword
bool isKeyword = false;
foreach (var item in this.GetKeywords())
{
if (item.NickName == content)
{
result.TokenType = new TokenType(item.TokenType, content, content);
isKeyword = true;
break;
}
}
if (!isKeyword)
{
result.TokenType = new TokenType(
"identifier", content, "identifier");
}
return(true);
}