feat: parse ISC with parsanol natively

Drop the parslet dependency for the native Parsanol API (Parsanol::Parser,
include Parsanol in the grammar concerns, Parsanol::Transform,
Parsanol::ParseFailed) — not the Parsanol::Parslet compat shim.

Two tree-shape optimizations that the old engine could not reward:

- quoted strings capture escape-free stretches as one run slice instead
  of a per-char hash (a large map went from ~700k capture nodes to a
  few thousand)
- the DocumentBuilder decodes {string:} fragments directly instead of
  routing every quoted string through Transform pattern matching

acadsin parse+build: ~24 s -> ~15 s (parse 4.9 s, build 10 s). All 129
ISC/corpus/listing specs pass unchanged.

Author: ronaldtse

interscript.gemspec

@@ -35,5 +35,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency "thor"
   spec.add_dependency "interscript-maps", "~> #{Interscript::VERSION.split(".")[0, 2].join(".")}.0a"
   spec.add_dependency "text"
-  spec.add_dependency "parslet", "~> 2.0"
+  spec.add_dependency "parsanol", "~> 1.3"
 end

lib/interscript/compiler.rb

@@ -10,7 +10,7 @@ class Interscript::Compiler
 
   def self.call(map, **kwargs)
     # DSL.parse locates, dispatches .isc and caches the parsed document —
-    # calling parse_isc here re-ran a ~30 s Parslet parse on every
+    # calling parse_isc here re-ran a full grammar parse on every
     # compiler instantiation.
     map = Interscript::DSL.parse(map) if String === map
     compiler = new

lib/interscript/dsl.rb

@@ -40,7 +40,7 @@ def self.parse(map_name, reverse: true)
       end
     end
     # ISC documents route through the ISC parser, not the .imp DSL.
-    # The parse is expensive (Parslet over the whole map) — cache it like
+    # The parse is expensive (the whole grammar over the map) — cache it like
     # the .imp path does, or every transliterate call re-parses the map.
     return @cache[map_name] = Interscript::Compiler.parse_isc(path) if path.end_with?(".isc")
 

lib/interscript/isc.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc

lib/interscript/isc/document_builder.rb

@@ -71,10 +71,12 @@ def build
       def unquote(fragment)
         return "" if fragment.nil?
         return fragment.to_s unless fragment.is_a?(Hash)
-        return fragment.to_s unless fragment.key?(:string)
+        # Direct decode for the overwhelmingly common shape — routing
+        # every quoted string through Transform pattern matching
+        # dominated large-map builds.
+        return Transform.decode_string_parts(fragment[:string]) if fragment.key?(:string)
 
-        out = @transform.apply(fragment)
-        out.is_a?(Items::StringValue) ? out.value : out.to_s
+        fragment.to_s
       end
 
       def unescape_braces(text)
@@ -325,17 +327,19 @@ def extract_dependency(item)
         }.compact
       end
 
-      # Convert a parslet tree fragment into a concrete Item object via Transform.
+      # Convert a grammar tree fragment into a concrete Item object via
+      # Transform. Reuses the builder's Transform instance — allocating
+      # one per fragment dominated large-map builds.
       def materialize(fragment)
         case fragment
         when Hash
           if fragment.key?(:concatenation)
-            Transform.new.apply(fragment)
+            @transform.apply(fragment)
           else
-            Transform.new.apply(concatenation: [fragment])
+            @transform.apply(concatenation: [fragment])
           end
         when Array
-          Transform.new.apply(concatenation: fragment)
+          @transform.apply(concatenation: fragment)
         when NilClass
           Items::None.new
         else

lib/interscript/isc/grammar.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc

lib/interscript/isc/grammar/concerns/aliases.rb

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc
     module Grammar
       module Concerns
         # Aliases block: named expressions reused throughout the system.
         module Aliases
-          include Parslet
+          include Parsanol
 
           rule(:aliases_block) do
             str("aliases") >> whitespace? >>

lib/interscript/isc/grammar/concerns/dependencies.rb

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc
     module Grammar
       module Concerns
         # Dependencies: references to other systems whose stages may be invoked.
         module Dependencies
-          include Parslet
+          include Parsanol
 
           rule(:dependency_decl) do
             str("dependency") >> whitespace >>

lib/interscript/isc/grammar/concerns/items.rb

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc
     module Grammar
       module Concerns
         # Item expressions: the building blocks of rule matches and targets.
         module Items
-          include Parslet
+          include Parsanol
 
           rule(:item_atom) do
             quoted_string |

lib/interscript/isc/grammar/concerns/metadata.rb

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
-require "parslet"
+require "parsanol"
 
 module Interscript
   module Isc
     module Grammar
       module Concerns
         # Metadata block: identity + provenance + lifecycle of a system.
         module Metadata
-          include Parslet
+          include Parsanol
 
           rule(:metadata_block) do
             str("metadata") >> whitespace? >>