Remove '$0' special syntax

oprypin · ysbaddaden · commit a0f31a53d86e · 2017-08-18T10:46:22.000+02:00
diff --git a/spec/compiler/parser/parser_spec.cr b/spec/compiler/parser/parser_spec.cr
@@ -858,6 +858,7 @@ describe "Parser" do
 
   it_parses "$~", Global.new("$~")
   it_parses "$~.foo", Call.new(Global.new("$~"), "foo")
+  it_parses "$0", Call.new(Global.new("$~"), "[]", 0.int32)
   it_parses "$1", Call.new(Global.new("$~"), "[]", 1.int32)
   it_parses "$1?", Call.new(Global.new("$~"), "[]?", 1.int32)
   it_parses "foo $1", Call.new(nil, "foo", Call.new(Global.new("$~"), "[]", 1.int32))
@@ -874,9 +875,6 @@ describe "Parser" do
   it_parses "foo $?", Call.new(nil, "foo", Global.new("$?"))
   it_parses "$? = 1", Assign.new("$?".var, 1.int32)
 
-  it_parses "$0", Path.global("PROGRAM_NAME")
-  it_parses "foo $0", Call.new(nil, "foo", Path.global("PROGRAM_NAME"))
-
   it_parses "foo out x; x", [Call.new(nil, "foo", Out.new("x".var)), "x".var]
   it_parses "foo(out x); x", [Call.new(nil, "foo", Out.new("x".var)), "x".var]
   it_parses "foo out @x; @x", [Call.new(nil, "foo", Out.new("@x".instance_var)), "@x".instance_var]
diff --git a/src/compiler/crystal/syntax/parser.cr b/src/compiler/crystal/syntax/parser.cr
@@ -894,18 +894,14 @@ module Crystal
         end
       when :GLOBAL_MATCH_DATA_INDEX
         value = @token.value.to_s
-        if value == "0"
-          node_and_next_token Path.global("PROGRAM_NAME")
+        if value.ends_with? '?'
+          method = "[]?"
+          value = value.rchop
         else
-          if value.ends_with? '?'
-            method = "[]?"
-            value = value.rchop
-          else
-            method = "[]"
-          end
-          location = @token.location
-          node_and_next_token Call.new(Global.new("$~").at(location), method, NumberLiteral.new(value.to_i))
+          method = "[]"
         end
+        location = @token.location
+        node_and_next_token Call.new(Global.new("$~").at(location), method, NumberLiteral.new(value.to_i))
       when :__LINE__
         node_and_next_token MagicConstant.expand_line_node(@token.location)
       when :__END_LINE__
diff --git a/src/compiler/crystal/tools/formatter.cr b/src/compiler/crystal/tools/formatter.cr
@@ -970,14 +970,6 @@ module Crystal
     end
 
     def visit(node : Path)
-      # This is the case of $0, which generates `PROGRAM_NAME` by the parser
-      if @token.type == :GLOBAL_MATCH_DATA_INDEX
-        write "$"
-        write @token.value
-        next_token
-        return false
-      end
-
       check_open_paren
 
       # Sometimes the :: is not present because the parser generates ::Nil, for example
