This patch extends the syntax with a new #line directive that is inspired
by the homonymous CPP directive. It can be specified in all locations a #if
is legal (Stmt, Decl).
Semantics
---------
#line 42 "file.swift"
This makes diagnostics and debug information behave as if the subsequent
lines came from file.swift+42.
#line // without arguments
This switches back to the main source file and the switches back to the
normal line numbering. Any previous #line directives will result in gaps
in the main file.
Rationale
---------
LLDB and the REPL need this for making expressions that are entered into
the expression evaluator or REPL debugable. For more info see
<rdar://problem/17441710> Need #line directive or something similar so we can enhance the debugging of expressions and REPL
Also, I believe the stdlib would benefit from this and it would allow us
to get rid of the line-directive wrapper script.
Swift SVN r19384
...in preparation for non-source locations, i.e. locations that don't come
frome source buffers.
No functionality change, but a fair bit of SourceManager API and idioms have
changed.
Swift SVN r18942
Previously, the frontend detected that its output was being piped into the
driver and buffered, and decided that that wasn't a color-friendly output
stream. Now, the driver passes -color-diagnostics to the frontend to force
color output if the driver itself is in a color-output context.
<rdar://problem/16697713>
Swift SVN r18506
integration
Motivation: libIDE clients should be simple, and they should not have to
translate token-based SourceRanges to character locations.
This also allows us to remove the dependency of DiagnosticConsumer on the
Lexer. Now the DiagnosticEngine translates the diagnostics to CharSourceRanges
and passes character-based ranges to the DiagnosticConsumer.
Swift SVN r7173
