interp: Add internal _is_<type> helpers

dev/snippets.jq

@@ -84,6 +84,6 @@ def duration:
         )
       ] | join("")
     end;
-  if . | type == "string" then _string
+  if type == "string" then _string
-  elif . | type == "number" then _number
+  elif type == "number" then _number
   else error("expected string or number") end;

pkg/interp/eval.jq

@@ -75,7 +75,7 @@ def _eval_query_rewrite($opts):
 
 # TODO: better way? what about nested eval errors?
 def _eval_is_compile_error:
-  type == "object" and .error != null and .what != null;
+  _is_object and .error != null and .what != null;
 def _eval_compile_error_tostring:
   [ (.filename // "expr")
   , if .line != 1 or .column != 0 then "\(.line):\(.column)"

pkg/interp/funcs.jq

@@ -9,7 +9,7 @@ def display($opts):
   ( options($opts) as $opts
   | if _can_display then _display($opts)
     else
-      ( if type == "string" and $opts.raw_string then print
+      ( if _is_string and $opts.raw_string then print
         else _print_color_json($opts)
         end
       , ( $opts.join_string
@@ -302,8 +302,8 @@ def tojq($style):
     } as $styles
   | _f(
       ( $style // "compact"
-      | if type == "string" then $styles[.]
+      | if _is_string then $styles[.]
-        elif type == "object" then .
+        elif _is_object then .
         else error("invalid style")
         end
       )

pkg/interp/grep.jq

@@ -8,7 +8,7 @@ def grep_by(f):
   );
 
 def _value_grep_string_cond($v; $flags):
-  if type == "string" then test($v; $flags)
+  if _is_string then test($v; $flags)
   else false
   end;
 
@@ -16,7 +16,7 @@ def _value_grep_other_cond($v; $flags):
   . == $v;
 
 def vgrep($v; $flags):
-  if $v | type == "string" then
+  if $v | _is_string then
     grep_by(_is_scalar and _value_grep_string_cond($v; $flags))
   else
     grep_by(_is_scalar and _value_grep_other_cond($v; $flags))
@@ -26,7 +26,7 @@ def vgrep($v): vgrep($v; "");
 def _buf_grep_any_cond($v; $flags):
   (isempty(tobytesrange | match($v; $flags)) | not)? // false;
 def bgrep($v; $flags):
-  if $v | type == "string" then
+  if $v | _is_string then
     grep_by(_is_scalar and _buf_grep_any_cond($v; $flags))
   else
     grep_by(_is_scalar and _buf_grep_any_cond($v; $flags))
@@ -34,7 +34,7 @@ def bgrep($v; $flags):
 def bgrep($v): bgrep($v; "");
 
 def grep($v; $flags):
-  if $v | type == "string" then
+  if $v | _is_string then
     grep_by(_is_scalar and _buf_grep_any_cond($v; $flags) or _value_grep_string_cond($v; $flags))
   else
     grep_by(_is_scalar and _buf_grep_any_cond($v; $flags) or _value_grep_other_cond($v; $flags))

pkg/interp/internal.jq

@@ -102,8 +102,6 @@ def _intdiv($a; $b):
   | ($a - ($a % $b)) / $b
   );
 
-# valid jq identifier, start with alpha or underscore then zero or more alpha, num or underscore
-def _is_ident: type == "string" and test("^[a-zA-Z_][a-zA-Z_0-9]*$");
 # escape " and \
 def _escape_ident: gsub("(?<g>[\\\\\"])"; "\\\(.g)");
 
@@ -131,8 +129,16 @@ def _recurse_break(f):
     else error
     end;
 
-def _is_scalar:
+def _is_null: type == "null";
-  type |. != "array" and . != "object";
+def _is_string: type == "string";
+def _is_number: type == "number";
+def _is_boolean: type == "boolean";
+def _is_array: type == "array";
+def _is_object: type == "object";
+def _is_scalar: (_is_array or _is_object) | not;
+
+# valid jq identifier, start with alpha or underscore then zero or more alpha, num or underscore
+def _is_ident: _is_string and test("^[a-zA-Z_][a-zA-Z_0-9]*$");
 
 def _is_context_canceled_error: . == "context canceled";
 
@@ -146,7 +152,7 @@ def _path_to_expr($opts):
       [""] + .
     end
   | map(
-      if type == "number" then
+      if _is_number then
         ( ("[" | _ansi_if($opts; "array"))
         , _ansi_if($opts; "number")
         , ("]" | _ansi_if($opts; "array"))
@@ -178,10 +184,10 @@ def _tree_path(children; name; $v):
     # ["a", "b", 1] => ["a", 0, "b", 1]
     def _normalize_path:
       ( . as $np
-      | if $np | last | type == "string" then $np+[0] end
+      | if $np | last | _is_string then $np+[0] end
       # state is [path acc, possible pending zero index]
       | ( reduce .[] as $np ([[], []];
-          if $np | type == "string" then
+          if $np | _is_string then
             [(.[0]+.[1]+[$np]), [0]]
           else
             [.[0]+[$np], []]
@@ -193,7 +199,7 @@ def _tree_path(children; name; $v):
     | _expr_to_path
     | _normalize_path
     | reduce .[] as $n ($c;
-        if $n | type == "string" then
+        if $n | _is_string then
           children | map(select(name == $n))
         else
           .[$n]
@@ -217,7 +223,7 @@ def _tree_path(children; name; $v):
     ]
     | flatten
     | join("");
-  if $v | type == "string" then _lookup
+  if $v | _is_string then _lookup
   else _path
   end;
 

pkg/interp/interp.jq

@@ -55,7 +55,7 @@ def input:
         ( . as $err
         | _input_decode_errors(. += {($name): $err}) as $_
         | [ $opts.decode_format
-          , if $err | type == "string" then ": \($err)"
+          , if $err | _is_string then ": \($err)"
             # TODO: if not string assume decode itself failed for now
             else ": failed to decode (try -d FORMAT)"
             end
@@ -121,7 +121,7 @@ def input_filename: _input_filename;
 
 # user expr error, report and continue
 def _cli_eval_on_expr_error:
-  ( if type == "object" then
+  ( if _is_object then
       if .error | _eval_is_compile_error then .error | _eval_compile_error_tostring
       elif .error then .error
       end

pkg/interp/options.jq

@@ -110,7 +110,7 @@ def _opt_options:
 
 def _opt_eval($rest):
   ( with_entries(
-      ( select(.value | type == "string" and startswith("@"))
+      ( select(.value | _is_string and startswith("@"))
       | .value |=
           ( . as $v
           | try
@@ -239,17 +239,17 @@ def _opt_to_string:
 def _opt_from_string: if . then tojson[1:-1] else "" end;
 
 def _opt_is_string_pair:
-  type == "array" and length == 2 and all(type == "string");
+  _is_array and length == 2 and all(_is_string);
 
 def _opt_to_array(f):
   try
     ( fromjson
-    | if type == "array" and (all(f) | not) then null end
+    | if _is_array and (all(f) | not) then null end
     )
   catch null;
 
 def _opt_to_array_string_pair: _opt_to_array(_opt_is_string_pair);
-def _opt_to_array_string: _opt_to_array(type == "string");
+def _opt_to_array_string: _opt_to_array(_is_string);
 
 def _opt_from_array: tojson;
 

pkg/interp/repl.jq

@@ -121,7 +121,7 @@ def _prompt($opts):
   def _value_path:
     (._path? // []) | if . == [] then empty else _path_to_expr($opts) end;
   def _value_preview($depth):
-    if $depth == 0 and format == null and type == "array" then
+    if $depth == 0 and format == null and _is_array then
       [ "["
       , if length == 0 then empty
         else