#   Copyright (C) 2012-2020 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# helper to deal with fortran modules

# Remove files for specified Fortran modules.
# This includes both .mod and .smod files.
proc cleanup-modules { modlist } {
    global clean
    foreach mod [concat $modlist $clean] {
	set m [string tolower $mod].mod
	verbose "cleanup-module `$m'" 2
	if [is_remote host] {
	    remote_file host delete $m
	}
	remote_file build delete $m
    }
    cleanup-submodules $modlist
}

# Remove files for specified Fortran submodules.
proc cleanup-submodules { modlist } {
    global clean
    foreach mod [concat $modlist $clean] {
	set m [string tolower $mod].smod
	verbose "cleanup-submodule `$m'" 2
	if [is_remote host] {
	    remote_file host delete $m
	}
	remote_file build delete $m
    }
}

proc keep-modules { modlist } {
    global clean
    # if the modlist is empty, keep everything
    if {[llength $modlist] < 1} {
	set clean {}
    } else {
	set cleansed {}
	foreach cl $clean {
	    if {[lsearch $cl $modlist] < 0} {
		lappend cleansed $cl
	    }
	}
	if {[llength $clean] == [llength $cleansed]} {
	    warning "keep-modules had no effect?! Possible typo in module name."
	}
	set clean $cleansed
    }
}

# collect all module names from a source-file
proc list-module-names { files } {
    global clean
    set clean {}
    foreach file $files {
	foreach mod [list-module-names-1 $file] {
	    if {[lsearch $clean $mod] < 0} {
		lappend clean $mod
	    }
	}
    }
    return [join $clean " "]
}

proc list-module-names-1 { file } {
    set result {}
    if {[file isdirectory $file]} {return}
    # Find lines containing INCLUDE, MODULE, and SUBMODULE, excluding the lines containing
    # MODULE [PURE|(IMPURE\s+)?ELEMENTAL|RECURSIVE] (PROCEDURE|FUNCTION|SUBROUTINE)
    set pat {^\s*((#)?\s*include|(sub)?module(?!\s+((pure|(impure\s+)?elemental|recursive)\s+)?(procedure|function|subroutine)[:\s]+))\s*.*}
    set tmp [igrep $file $pat line]
    if {![string match "" $tmp]} {
	foreach i $tmp {
	    regexp -nocase {(\d+)\s+#?\s*include\s+["']([^"']*)["']} $i dummy lineno include_file
	    if {[info exists include_file]} {
		set dir [file dirname $file]
		set inc "$dir/$include_file"
		unset include_file
		if {![file readable $inc]} {
		    # We do not currently use include path search logic, punt
		    continue
		}
		verbose "Line $lineno includes `$inc'" 3
		foreach mod [list-module-names-1 $inc] {
		    if {[lsearch $result $mod] < 0} {
			lappend result $mod
		    }
		}
		continue
	    }
	    regexp -nocase {(\d+)\s+(module|submodule)\s*([^;]*)} $i i lineno keyword mod
	    if {![info exists mod]} {
		continue
	    }
	    # Generates the file name mod_name@submod_name from
	    # (\s*mod_name[:submod_name]\s*)\s*submod_name\s*[! comment]
	    regsub {\s*!.*} $mod "" mod
	    regsub {:[^)]*} $mod "" mod
	    regsub {\(\s*} $mod "" mod
	    regsub {\s*\)\s*} $mod "@" mod
	    verbose "Line $lineno mentions module `$mod'" 3
	    if {[lsearch $result $mod] < 0} {
		lappend result $mod
	    }
	}
    }
    return $result
}

# Looks for case insensitive occurrences of a string in a file.
#     return:list of lines that matched or NULL if none match.
#     args:  first arg is the filename,
#            second is the pattern,
#            third are any options.
#     Options: line  - puts line numbers of match in list
#
proc igrep { args } {

    set file [lindex $args 0]
    set pattern [lindex $args 1]

    verbose "Grepping $file for the pattern \"$pattern\"" 3

    set argc [llength $args]
    if { $argc > 2 } {
        for { set i 2 } { $i < $argc } { incr i } {
            append options [lindex $args $i]
            append options " "
        }
    } else {
        set options ""
    }

    set i 0
    set fd [open $file r]
    while { [gets $fd cur_line]>=0 } {
        incr i
        if {[regexp -nocase -- "$pattern" $cur_line match]} {
            if {![string match "" $options]} {
                foreach opt $options {
                    switch $opt {
                        "line" {
                            lappend grep_out [concat $i $match]
                        }
                    }
                }
            } else {
                lappend grep_out $match
            }
        }
    }
    close $fd
    unset fd
    unset i
    if {![info exists grep_out]} {
        set grep_out ""
    }
    return $grep_out
}