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Model: megamindbrian/josiefied-qwen-spatial-engine
Source: Original Platform

grammar.bnf

@@ -0,0 +1,54 @@
+# Root: Handles empty arrays, loose lists, or coordinate blocks
+root ::= (block_sequence | empty_scene)? ws?
+
+empty_scene ::= "[]"
+
+block_sequence ::= block (ws_or_nl* block)*
+
+# A block is a raw tag name or a fully positioned layout primitive
+block ::= primitive (anchor? vector)?
+
+primitive ::= "[" [a-zA-Z0-9_-]+ "]"
+
+anchor ::= "[abs]" | "[@" [0-9]+ ("," ws? "@" [0-9]+)* "]"
+
+# Vector strings support flat numbers, expressions, nested matrices, or config parameters
+# Enforces a valid item before and after every comma to break on double commas ,,
+vector ::= "[" value ("," ws? value)* "]"
+
+value ::= nested_array | parameter_assignment | expression | attribute | signed_num | boolean_flag | variable
+
+# Captures matrices like [1,1,1.5] or [-0.6,0.6,-0.4] cleanly
+nested_array ::= "[" value ("," ws? value)* "]"
+
+# Captures both taper=(z,0.5) and functional variations like taper(z,0.7) or noise(0.4)
+parameter_assignment ::= [a-zA-Z_-]+ "=(" ws? [xyz] ws? "," ws? signed_num ws? ")" | [a-zA-Z_-]+ "(" ws? [xyz] ws? "," ws? num ws? ")" | [a-zA-Z_-]+ "(" num ")"
+
+# Expressions handle explicit signs directly adjacent to implicit multi-variables
+expression ::= term (op term)*
+
+# Fully parses 'fw * 4', implicit coefficients like '-4fw', '-4fd', or solo variables
+# FIX: Added sign? variable to cleanly handle prefixed variables like -fd or -hh
+term ::= variable ("*" (variable | signed_num))? | signed_num variable? | sign? variable | "sym(" ws? expression ws? ")"
+variable ::= "fw" | "hw" | "fd" | "hd" | "fh" | "hh" | "bd" | "bh" | "@idx" | "@" [0-9]+
+
+boolean_flag ::= "surf" | "-%"
+
+# Layout modifier keywords or attributes
+attribute ::= "noise=" signed_num | "mesh" | "surf" | "-%"
+
+# STRICT number definition - only one sign character allowed total
+positive_num ::= [0-9]+ ("." [0-9]+)?
+negative_num ::= "-" [0-9]+ ("." [0-9]+)?
+num ::= positive_num | negative_num
+
+# FIX: Changed to sign? positive_num to allow things like +5 or -5 without doubling up a negative_num's minus sign
+signed_num ::= sign? positive_num | negative_num
+
+# SINGLE sign only - completely kills any '--' variants instantly
+sign ::= "+" | "-"
+
+op ::= "+" | "-" | "*" | "/"
+
+ws ::= [ \t]+
+ws_or_nl ::= [ \t\r\n]+