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Added stream input to the regular expressions, greatly simplifying the usage (in particular, we no longer have to specify the number of characters to be checked).

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This commit is contained in:
Jesse Beder
2008-06-27 19:07:30 +00:00
parent 4e435b1321
commit de29068110
4 changed files with 232 additions and 85 deletions
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56
scanner.cpp
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@@ -48,22 +48,6 @@ namespace YAML
}
}
// Peek
// . Peeks at the next 'n' characters and returns them in a string.
std::string Scanner::Peek(int n)
{
std::string ret;
int pos = INPUT.tellg();
for(int i=0;i<n;i++)
ret += INPUT.get();
INPUT.clear();
INPUT.seekg(pos);
return ret;
}
// GetLineBreak
// . Eats with no checking
void Scanner::EatLineBreak()
@@ -97,7 +81,7 @@ namespace YAML
if(m_column != 0)
return false;
return Exp::DocStart.Matches(Peek(4));
return Exp::DocStart.Matches(INPUT);
}
// IsDocumentEnd
@@ -107,41 +91,37 @@ namespace YAML
if(m_column != 0)
return false;
return Exp::DocEnd.Matches(Peek(4));
return Exp::DocEnd.Matches(INPUT);
}
// IsBlockEntry
bool Scanner::IsBlockEntry()
{
return Exp::BlockEntry.Matches(Peek(2));
return Exp::BlockEntry.Matches(INPUT);
}
// IsKey
bool Scanner::IsKey()
{
std::string next = Peek(2);
if(m_flowLevel > 0)
return Exp::KeyInFlow.Matches(next);
return Exp::Key.Matches(next);
return Exp::KeyInFlow.Matches(INPUT);
return Exp::Key.Matches(INPUT);
}
// IsValue
bool Scanner::IsValue()
{
std::string next = Peek(2);
if(m_flowLevel > 0)
return Exp::ValueInFlow.Matches(next);
return Exp::Value.Matches(next);
return Exp::ValueInFlow.Matches(INPUT);
return Exp::Value.Matches(INPUT);
}
// IsPlainScalar
// . Rules:
bool Scanner::IsPlainScalar()
{
std::string next = Peek(2);
if(m_flowLevel > 0)
return Exp::PlainScalarInFlow.Matches(next);
return Exp::PlainScalar.Matches(next);
return Exp::PlainScalarInFlow.Matches(INPUT);
return Exp::PlainScalar.Matches(INPUT);
}
///////////////////////////////////////////////////////////////////////
@@ -368,21 +348,19 @@ namespace YAML
break;
// comment
if(Exp::Comment.Matches(INPUT.peek()))
if(Exp::Comment.Matches(INPUT))
break;
// first eat non-blanks
while(INPUT && !Exp::BlankOrBreak.Matches(INPUT.peek())) {
std::string next = Peek(2);
while(INPUT && !Exp::BlankOrBreak.Matches(INPUT)) {
// illegal colon in flow context
if(m_flowLevel > 0 && Exp::IllegalColonInScalar.Matches(next))
if(m_flowLevel > 0 && Exp::IllegalColonInScalar.Matches(INPUT))
throw IllegalScalar();
// characters that might end the scalar
if(m_flowLevel > 0 && Exp::EndScalarInFlow.Matches(next))
if(m_flowLevel > 0 && Exp::EndScalarInFlow.Matches(INPUT))
break;
if(m_flowLevel == 0 && Exp::EndScalar.Matches(next))
if(m_flowLevel == 0 && Exp::EndScalar.Matches(INPUT))
break;
if(leadingBlanks) {
@@ -409,12 +387,12 @@ namespace YAML
}
// did we hit a non-blank character that ended us?
if(!Exp::BlankOrBreak.Matches(INPUT.peek()))
if(!Exp::BlankOrBreak.Matches(INPUT))
break;
// now eat blanks
while(INPUT && Exp::BlankOrBreak.Matches(INPUT.peek())) {
if(Exp::Blank.Matches(INPUT.peek())) {
while(INPUT && Exp::BlankOrBreak.Matches(INPUT)) {
if(Exp::Blank.Matches(INPUT)) {
if(leadingBlanks && m_column <= m_indents.top())
throw IllegalTabInScalar();