objective-c scanner for #import dependencies

[chrisweed@…]

boost-build does not have a scanner for objective-c files (*.m, *.mm, *.mm) to follow #import dependenies. I have used the following in builtin.jam to some success. This is basically the c-scanner code with "include" replaced with "import" and then registering the scanner with the objective-c file types. Chris

class m-scanner : scanner { import path ; import regex ; import scanner ; import sequence ; import virtual-target ;

rule init ( includes * ) { scanner.init ;

for local i in $(includes) { self.includes += [ sequence.transform path.native : [ regex.split $(i:G=) "&&" ] ] ; } }

rule pattern ( ) { return "#[ \t]*import[ ]*(<(.*)>|\"(.*)\")" ; }

rule process ( target : matches * : binding ) { local angle = [ regex.transform $(matches) : "<(.*)>" ] ; local quoted = [ regex.transform $(matches) : "\"(.*)\"" ] ;

# CONSIDER: the new scoping rule seem to defeat "on target" variables. local g = [ on $(target) return $(HDRGRIST) ] ; local b = [ NORMALIZE_PATH $(binding:D) ] ;

# Attach binding of including file to included targets. When a target is # directly created from virtual target this extra information is # unnecessary. But in other cases, it allows us to distinguish between # two headers of the same name included from different places. We do not # need this extra information for angle includes, since they should not # depend on including file (we can not get literal "." in include path). local g2 = $(g)"#"$(b) ;

angle = $(angle:G=$(g)) ; quoted = $(quoted:G=$(g2)) ;

local all = $(angle) $(quoted) ;

INCLUDES $(target) : $(all) ; NOCARE $(all) ; SEARCH on $(angle) = $(self.includes:G=) ; SEARCH on $(quoted) = $(b) $(self.includes:G=) ;

# Just propagate the current scanner to includes in hope that includes # do not change scanners. scanner.propagate $(name) : $(angle) $(quoted) : $(target) ;

ISFILE $(angle) $(quoted) ; } }

scanner.register m-scanner : include ;

type.set-scanner OBJECTIVE_C : m-scanner ; type.set-scanner OBJECTIVE_CPP : m-scanner ; type.set-scanner OBJECTIVE_C : c-scanner ; type.set-scanner OBJECTIVE_CPP : c-scanner ;