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20be503cae 2010-11-24        kinaba: /**
3464a035ec 2010-11-20        kinaba:  * Authors: k.inaba
3464a035ec 2010-11-20        kinaba:  * License: NYSL 0.9982 http://www.kmonos.net/nysl/
3464a035ec 2010-11-20        kinaba:  *
3464a035ec 2010-11-20        kinaba:  * Error Information for Polemy Programming Language
3464a035ec 2010-11-20        kinaba:  */
3464a035ec 2010-11-20        kinaba: module polemy.failure;
3464a035ec 2010-11-20        kinaba: import polemy._common;
3995a5eb6a 2010-11-21        kinaba: 
3995a5eb6a 2010-11-21        kinaba: /// Represents a position in source codes
3995a5eb6a 2010-11-21        kinaba: 
3995a5eb6a 2010-11-21        kinaba: alias immutable(LexPosition_t) LexPosition;
2bdfb8a182 2010-11-21        kinaba: 
2bdfb8a182 2010-11-21        kinaba: /// Represents a position in source codes
2bdfb8a182 2010-11-21        kinaba: 
2bdfb8a182 2010-11-21        kinaba: class LexPosition_t
3464a035ec 2010-11-20        kinaba: {
3464a035ec 2010-11-20        kinaba: 	immutable string filename; /// name of the source file
3464a035ec 2010-11-20        kinaba: 	immutable int    lineno;   /// 1-origin
3464a035ec 2010-11-20        kinaba: 	immutable int    column;   /// 1-origin
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: 	mixin SimpleClass;
3464a035ec 2010-11-20        kinaba: 	override string toString() const
2134cd44cc 2010-11-23        kinaba: 		{ return sprintf!("%s:%d:%d")(filename, lineno, column); }
2bdfb8a182 2010-11-21        kinaba: 	static LexPosition dummy;
f9c31f3cd8 2010-11-24        kinaba: 	static this(){ dummy = new LexPosition("<nowhere>",0,0); }
3464a035ec 2010-11-20        kinaba: }
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: unittest
3464a035ec 2010-11-20        kinaba: {
3464a035ec 2010-11-20        kinaba: 	auto p = new LexPosition("hello.cpp", 123, 45);
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: 	assert_eq( p.filename, "hello.cpp" );
3464a035ec 2010-11-20        kinaba: 	assert_eq( p.lineno, 123 );
3464a035ec 2010-11-20        kinaba: 	assert_eq( p.column, 45 );
3464a035ec 2010-11-20        kinaba: 	assert_eq( text(p), "hello.cpp:123:45" );
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: 	assert( !__traits(compiles, new LexPosition) );
3464a035ec 2010-11-20        kinaba: 	assert( !__traits(compiles, p.filename="foo") );
3464a035ec 2010-11-20        kinaba: 	assert( !__traits(compiles, p.lineno  =789) );
3464a035ec 2010-11-20        kinaba: 	assert( !__traits(compiles, p.column  =222) );
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: 	auto q = new LexPosition("hello.cpp", 123, 46);
3464a035ec 2010-11-20        kinaba: 	assert_lt( p, q );
3464a035ec 2010-11-20        kinaba: 	assert_ne( p, q );
3464a035ec 2010-11-20        kinaba: }
3464a035ec 2010-11-20        kinaba: 
3464a035ec 2010-11-20        kinaba: /*mixin*/
3464a035ec 2010-11-20        kinaba: template ExceptionWithPosition()
3464a035ec 2010-11-20        kinaba: {
2bdfb8a182 2010-11-21        kinaba: 	LexPosition pos;
2bdfb8a182 2010-11-21        kinaba: 	this( LexPosition pos, string msg, string file=null, size_t line=0, Throwable next=null )
3464a035ec 2010-11-20        kinaba: 	{
2134cd44cc 2010-11-23        kinaba: 		string fullmsg = pos is null ? sprintf!("\n[??] %s")(msg)
2134cd44cc 2010-11-23        kinaba: 		                             : sprintf!("\n[%s] %s")(pos, msg);
b993a8ad16 2010-11-24        kinaba: 		foreach_reverse(i,_; callstack_pos)
2134cd44cc 2010-11-23        kinaba: 		{
b993a8ad16 2010-11-24        kinaba: 			LexPosition p = callstack_pos[i];
b993a8ad16 2010-11-24        kinaba: 			string      m = callstack_msg[i];
2134cd44cc 2010-11-23        kinaba: 			fullmsg ~= p is null ? sprintf!("\n[??] %s")(m)
2134cd44cc 2010-11-23        kinaba: 		                         : sprintf!("\n[%s] %s")(p, m);
2134cd44cc 2010-11-23        kinaba: 		}
2134cd44cc 2010-11-23        kinaba: 		super(fullmsg, file, line, next);
3464a035ec 2010-11-20        kinaba: 		this.pos = pos;
2134cd44cc 2010-11-23        kinaba: 	}
2134cd44cc 2010-11-23        kinaba: 	this( string msg, string file=null, size_t line=0, Throwable next=null )
2134cd44cc 2010-11-23        kinaba: 	{
2134cd44cc 2010-11-23        kinaba: 		this(null, msg, file, line, next);
3464a035ec 2010-11-20        kinaba: 	}
3464a035ec 2010-11-20        kinaba: }
3464a035ec 2010-11-20        kinaba: 
2134cd44cc 2010-11-23        kinaba: class UnexpectedEOF    : Exception { mixin ExceptionWithPosition; } /// EOF during lexing/parsing
2134cd44cc 2010-11-23        kinaba: class LexException     : Exception { mixin ExceptionWithPosition; } /// Lexer errors
2134cd44cc 2010-11-23        kinaba: class ParseException   : Exception { mixin ExceptionWithPosition; } /// Parser errors
3464a035ec 2010-11-20        kinaba: class RuntimeException : Exception { mixin ExceptionWithPosition; } /// Evaluator errors
2134cd44cc 2010-11-23        kinaba: 
2134cd44cc 2010-11-23        kinaba: /// Per-thread call stack management.
2134cd44cc 2010-11-23        kinaba: /// This scoped class's ctor&dtor maintain the callstack.
2134cd44cc 2010-11-23        kinaba: /// TODO: make it "per-evaluator" !!!!!!!!!!!
2134cd44cc 2010-11-23        kinaba: 
2134cd44cc 2010-11-23        kinaba: scope class PushCallStack
2134cd44cc 2010-11-23        kinaba: {
2134cd44cc 2010-11-23        kinaba: 	this(LexPosition pos, string msg) { callstackEnterFunction(pos,msg); }
2134cd44cc 2010-11-23        kinaba: 	~this() { callstackLeaveFunction(); }
2134cd44cc 2010-11-23        kinaba: }
2134cd44cc 2010-11-23        kinaba: 
2134cd44cc 2010-11-23        kinaba: LexPosition[] callstack_pos;
2134cd44cc 2010-11-23        kinaba: string[]      callstack_msg;
2134cd44cc 2010-11-23        kinaba: 
2134cd44cc 2010-11-23        kinaba: private void callstackEnterFunction(LexPosition pos, string msg)
2134cd44cc 2010-11-23        kinaba: {
2134cd44cc 2010-11-23        kinaba: 	callstack_pos ~= pos;
2134cd44cc 2010-11-23        kinaba: 	callstack_msg ~= msg;
2134cd44cc 2010-11-23        kinaba: }
2134cd44cc 2010-11-23        kinaba: 
2134cd44cc 2010-11-23        kinaba: private void callstackLeaveFunction()
2134cd44cc 2010-11-23        kinaba: {
2134cd44cc 2010-11-23        kinaba: 	callstack_pos.length -= 1;
2134cd44cc 2010-11-23        kinaba: 	callstack_msg.length -= 1;
2134cd44cc 2010-11-23        kinaba: }