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continue;
}
return;
}
}
Term Lexer::readStringLiteral( ir::Location&& loc )
{
string str;
bool complete = false;
// TODO this is very simplistic, at some point
// we'll want to handle escape characters etc.
while( m_input.good() )
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continue;
}
return;
}
}
Term Lexer::readStringLiteral( Location&& loc )
{
string str;
bool complete = false;
// TODO this is very simplistic, at some point
// we'll want to handle escape characters etc.
while( m_input.good() )
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newLine();
break;
}
str += c;
}
ir::Term result( move( loc ), str );
if( !complete )
{
cout << result.location() << ": unterminated string literal.\n";
result.setFaulty();
}
return result;
}
Term Lexer::readIntegerLiteral( ir::Location&& loc )
{
uint64_t val = 0;
while( m_input.good() )
{
auto c = m_input.peek();
if( !isdigit( c ) )
break;
val = val * 10 + c - '0';
}
ir::Term result( move( loc ), val );
return result;
}
optional< Term > Lexer::readToken()
{
skipSpacingIfAny();
if( !m_input.good() )
return nullopt;
ir::Location loc( m_filename, m_lineNum, m_input.tellg() - m_lastLineBreakOffset );
auto c = m_input.peek();
switch( c )
{
case '{':
m_input.get();
return ir::Term( move( loc ), "{"_sid );
case '}':
m_input.get();
return ir::Term( move( loc ), "}"_sid );
case '(':
m_input.get();
return ir::Term( move( loc ), "("_sid );
case ')':
m_input.get();
return ir::Term( move( loc ), ")"_sid );
case '[':
m_input.get();
return ir::Term( move( loc ), "["_sid );
case ']':
m_input.get();
return ir::Term( move( loc ), "]"_sid );
case '"':
m_input.get();
return readStringLiteral( move( loc ) );
}
if( isdigit( c ) )
return readIntegerLiteral( move( loc ) );
return nullopt;
}
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newLine();
break;
}
str += c;
}
Term result( move( loc ), str );
if( !complete )
{
cout << result.location() << ": unterminated string literal.\n";
result.setFaulty();
}
return result;
}
Term Lexer::readIntegerLiteral( Location&& loc )
{
uint64_t val = 0;
while( m_input.good() )
{
auto c = m_input.peek();
if( !isdigit( c ) )
break;
m_input.get();
val = val * 10 + c - '0';
}
Term result( move( loc ), val );
return result;
}
Term Lexer::readAlphanumericIdentifier( Location&& loc )
{
string str;
while( m_input.good() )
{
auto c = m_input.peek();
if( !isalpha( c ) && !isdigit( c ) && c != '_' )
break;
m_input.get();
str += c;
}
Term result( move( loc ), str );
return result;
}
optional< Term > Lexer::readToken()
{
skipSpacingIfAny();
if( !m_input.good() )
return nullopt;
Location loc( m_filename, m_lineNum, m_input.tellg() - m_lastLineBreakOffset );
auto c = m_input.peek();
switch( c )
{
case '{':
m_input.get();
return Term( move( loc ), "{"_sid );
case '}':
m_input.get();
return Term( move( loc ), "}"_sid );
case '(':
m_input.get();
return Term( move( loc ), "("_sid );
case ')':
m_input.get();
return Term( move( loc ), ")"_sid );
case '[':
m_input.get();
return Term( move( loc ), "["_sid );
case ']':
m_input.get();
return Term( move( loc ), "]"_sid );
case '"':
m_input.get();
return readStringLiteral( move( loc ) );
}
if( isdigit( c ) )
return readIntegerLiteral( move( loc ) );
if( isalpha( c ) || c == '_' )
return readAlphanumericIdentifier( move( loc ) );
cout << loc << ": unrecognized token.\n";
return nullopt;
}
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