location: handle `Loation::line_start` of 0 as a special case for the full file

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/location.nit b/src/location.nit
index 83ed72f..b65511d 100644 (file)
--- a/src/location.nit
+++ b/src/location.nit
@@ -55,6 +55,8 @@ class Location
        var file: nullable SourceFile
 
        # The starting line number (starting from 1)
+       #
+       # If `line_start==0` then the whole file is considered
        var line_start: Int
 
        # The stopping line number (starting from 1)
@@ -129,9 +131,12 @@ class Location
                var file_part = ""
                if file != null then
                        file_part = file.filename
-                       if file.filename.length > 0 then file_part += ":"
                end
 
+               if line_start <= 0 then return file_part
+
+               if file != null and file.filename.length > 0 then file_part += ":"
+
                if line_start == line_end then
                        if column_start == column_end then
                                return "{file_part}{line_start},{column_start}"
@@ -181,6 +186,8 @@ class Location
 
                var l = self
                var i = l.line_start
+               if i <= 0 then return ""
+
                var line_start = l.file.line_starts[i-1]
                var line_end = line_start
                var string = l.file.string