Header parsing: validate and find arguments/operands/main

author: Marshall Lochbaum <mwlochbaum@gmail.com> 2021-08-10 14:43:11 -0400
committer: Marshall Lochbaum <mwlochbaum@gmail.com> 2021-08-10 14:43:11 -0400
commit: f2c141572c5728a067d829b91c6722c07c2a49dc (patch)
tree: da7681b2c3b14281d56769b1251e935a8959f0f0
parent: acf90b32360c310c340965d41af30ffcb66ded04 (diff)
3 files changed, 46 insertions, 13 deletions
diff --git a/docs/bqn.js b/docs/bqn.js
index 339e4df0..ae3f502c 100644
--- a/docs/bqn.js
+++ b/docs/bqn.js
@@ -397,10 +397,10 @@ let glyph = x => {
 // Compiler
 runtime[42] = assertFn("Compiler");
 let compgen = run(
-  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- ,[runtime[0],runtime[1],runtime[2],runtime[3],runtime[4],runtime[6],runtime[7],runtime[8],runtime[9],runtime[10],runtime[11],runtime[12],runtime[13],runtime[14],runtime[15],runtime[16],runtime[17],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[27],runtime[28],runtime[29],runtime[30],runtime[31],runtime[32],runtime[33],runtime[34],runtime[35],runtime[36],runtime[37],runtime[38],runtime[39],runtime[40],runtime[41],runtime[42],runtime[43],runtime[44],runtime[45],runtime[46],runtime[47],runtime[48],runtime[49],runtime[50],runtime[51],runtime[52],runtime[53],runtime[54],runtime[55],runtime[56],runtime[58],runtime[59],runtime[61],10,-1,11,26,9,0,1,5,8,4,2,3,-3,-2,6,17,3.1415926535898,Infinity,-4,-5,-6,21,14,15,28,19,25,'\0','0','#','\'','\"','@',str("⋄,"),str(":;"),str("⇐←↩"),str("(){}⟨⟩"),str("‿"),str("·"),str("𝕊𝕏𝕎𝔽𝔾𝕤𝕩𝕨𝕣𝕗𝕘"),str(".¯π∞"),str("_"),str("aA"),str("•"),str("𝕨"),str(" "),str("#\'\"@"),str("s"),str("Unknown character"),str(": "),str("Unclosed quote"),str("Words can\'t only have underscores"),str("System dot with no name"),str("𝕣 can\'t be used with other word characters"),str("Numbers can\'t start with underscores"),str("Letter"),str(" \""),str("\" not allowed in numbers"),str("ea"),str("Negative sign in the middle of a number"),str("Portion of a number is empty"),str("Ill-formed decimal or exponent use"),str("π and ∞ must occur alone"),str("Missing "),str("opening"),str("closing"),str("Malformed bracket nesting"),str("Empty program"),str("Swapped open and closed brackets"),str("Parentheses can\'t contain separators"),str("Empty statement or expression"),str("Invalid assignment or stranding use"),str("Dot must be followed by a name"),str("Can\'t strand Nothing (·)"),str("Punctuation : and ; not allowed outside blocks"),str("Header-less bodies must come last"),str("At most two header-less bodies allowed"),str("Non-label headers unsupported for now!"),str("Invalid special names for block header"),str("Special name outside of any block"),str("Only blocks with explicit arguments can have multiple bodies"),str("Block bodies must be of the same kind"),str("Dot must be preceded by a subject"),str("Nothing (·) cannot be assigned"),str("Missing operand"),str("Can\'t use Nothing (·) in lists"),str("Double subjects (missing ‿?)"),str("Role of the two sides in assignment must match"),str("Can\'t return Nothing (·)"),str("Invalid use of 𝕨 in monadic case"),str("Assignment target must be a name or list of targets"),str("Can\'t nest assignments (write aliases with ⇐)"),str("Can\'t use result of function/modifier assignment without parentheses"),str("Can\'t define special name"),str("Redefinition"),str("Undefined identifier"),str("Can\'t export from surrounding scope"),str("Second-level parts of a train must be functions"),str("System values not supported")]
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+ ,[runtime[0],runtime[1],runtime[2],runtime[3],runtime[4],runtime[6],runtime[7],runtime[8],runtime[9],runtime[10],runtime[11],runtime[12],runtime[13],runtime[14],runtime[15],runtime[16],runtime[17],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[27],runtime[28],runtime[29],runtime[30],runtime[31],runtime[32],runtime[33],runtime[34],runtime[35],runtime[36],runtime[37],runtime[38],runtime[39],runtime[40],runtime[41],runtime[42],runtime[43],runtime[44],runtime[45],runtime[46],runtime[47],runtime[48],runtime[49],runtime[50],runtime[51],runtime[52],runtime[53],runtime[54],runtime[55],runtime[56],runtime[58],runtime[59],runtime[61],10,-1,11,26,9,0,1,5,8,4,2,3,-3,-2,6,17,3.1415926535898,Infinity,-4,-5,-6,21,14,15,28,19,25,'\0','0','#','\'','\"','@',str("⋄,"),str(":;"),str("⇐←↩"),str("(){}⟨⟩"),str("‿"),str("·"),str("𝕊𝕏𝕎𝔽𝔾𝕤𝕩𝕨𝕣𝕗𝕘"),str(".¯π∞"),str("_"),str("aA"),str("•"),str("𝕨"),str(" "),str("#\'\"@"),str("s"),str("Unknown character"),str(": "),str("Unclosed quote"),str("Words can\'t only have underscores"),str("System dot with no name"),str("𝕣 can\'t be used with other word characters"),str("Numbers can\'t start with underscores"),str("Letter"),str(" \""),str("\" not allowed in numbers"),str("ea"),str("Negative sign in the middle of a number"),str("Portion of a number is empty"),str("Ill-formed decimal or exponent use"),str("π and ∞ must occur alone"),str("Missing "),str("opening"),str("closing"),str("Malformed bracket nesting"),str("Empty program"),str("Swapped open and closed brackets"),str("Parentheses can\'t contain separators"),str("Empty statement or expression"),str("Invalid assignment or stranding use"),str("Dot must be followed by a name"),str("Can\'t strand Nothing (·)"),str("Punctuation : and ; not allowed outside blocks"),str("Header-less bodies must come last"),str("At most two header-less bodies allowed"),str("Missing operand in header"),str("Invalid header structure"),str("Header left argument without right"),str("Header operation must be name or valid self-reference (𝕊 or 𝕣)"),str("Only special name inputs allowed in headers for now!"),str("Invalid special names for block header"),str("Special name outside of any block"),str("Only blocks with explicit arguments can have multiple bodies"),str("Block bodies must be of the same kind"),str("Dot must be preceded by a subject"),str("Nothing (·) cannot be assigned"),str("Missing operand"),str("Can\'t use Nothing (·) in lists"),str("Double subjects (missing ‿?)"),str("Role of the two sides in assignment must match"),str("Can\'t return Nothing (·)"),str("Invalid use of 𝕨 in monadic case"),str("Assignment target must be a name or list of targets"),str("Can\'t nest assignments (write aliases with ⇐)"),str("Can\'t use result of function/modifier assignment without parentheses"),str("Can\'t define special name"),str("Redefinition"),str("Undefined identifier"),str("Can\'t export from surrounding scope"),str("Second-level parts of a train must be functions"),str("System values not supported")]
  ,[[0,1,0],[0,0,1],[1,0,2],[1,1,3],[0,0,[[],[4]]],[0,0,[[],[5]]],[0,0,[[],[6]]],[0,0,[[],[7]]],[0,0,[[],[8]]],[0,0,[[],[9]]],[0,0,10],[0,0,11],[0,0,12],[0,0,13],[0,0,[[],[14]]],[0,0,[[],[15]]],[2,1,16],[0,0,17],[2,1,18],[0,0,19],[1,0,20],[0,0,21],[0,0,[[],[22]]],[0,0,23],[0,0,24],[0,0,25],[2,1,26]]
- ,[[0,0],[3,43],[573,5],[592,5],[716,57],[2904,23],[3729,163],[10117,19],[10363,3],[10371,3],[10411,3],[10430,3],[10471,3],[10490,3],[10509,3],[10537,3],[10573,3],[10609,6],[10746,3],[10818,3],[10868,5],[10894,3],[10916,3],[10974,3],[11027,3],[11089,3],[11114,3]]
+ ,[[0,0],[3,43],[573,5],[592,5],[716,57],[2904,23],[3729,174],[10631,19],[10877,3],[10885,3],[10925,3],[10944,3],[10985,3],[11004,3],[11023,3],[11051,3],[11087,3],[11123,6],[11260,3],[11332,3],[11382,5],[11408,3],[11430,3],[11488,3],[11541,3],[11603,3],[11628,3]]
 );
 let compile = compgen(list(glyphs.map(str)));
 runtime[42] = rtAssert;
diff --git a/src/c.bqn b/src/c.bqn
index 307f1a3d..e5381371 100644
--- a/src/c.bqn
+++ b/src/c.bqn
@@ -158,23 +158,36 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
   bp←⟨/b,c⟩∾¨0(<≍○(</⟜g)>)g⊏p               # Bracket pairs
   g⊏˜↩gs←⍋gr⊏sl⋄gr↩g⊏rev⋄gi←⍋g              # Send strand prefixes *‿ to the end
 
-  # Block properties
+  # Headers
   hh←𝕩=⊑bH⋄cs←𝕩=1+⊑bH                       # Case header : and separator ;
   "Punctuation : and ; not allowed outside blocks"_err_(↕∘≠) (∨`b)<hh∨cs
   fi←+`cb←b∨cs⋄H←cb¬∘PN⊢                    # Body index fi; which bodies Have a property
-
-  ch←H hh⋄hf←»cb
+  ch←H hh
   cf←1∾¬co←cb/cs⋄cm←0∾∨⟜«co                 # cf: body is first; cm: body is one of multiple
   "Header-less bodies must come last"_err_(/CB) 1(-⊸↓<co∧↓)ch
   "At most two header-less bodies allowed"_err_(/CB) »⊸∧co>¯1↓ch
   cc←(⍋⍋«co)⊏c∾/cs
-  "Non-label headers unsupported for now!"_err_(↕∘≠) hh>»(𝕩 M bI+0‿nv)∧hf
-  hr←0∾(hf/rev)⊏r⋄hf∧↩«hh⋄hu←(𝕩 M bI)<hf∧0<rev⊏r
+  rr←rev⊏r
+  hr←rr/˜hf←hh⊏˜⟜IT⌾((⌽g)⊸⊏)¯1=rr
+  hl←2=hn←(1⊸»+«)hc←¯1=hr
+  ho←(»∨·«(hr=3)∧⊢)hl<hd←2≤hr               # Header operands
+  "Missing operand in header"_err_(/HF) ho∧hc∨hd
+  hm←¬ho∨ha←ho<(0=hr)∧1=hn                  # Mask for main name; header arguments
+  "Invalid header structure"_err_(hm//∘HF) 1⊸»⊸=hm/hc
+  hm>↩hc⋄hr/˜↩hm⋄hx←(1»hc)/ha               # Header-derived role hr and immediacy ¬hx
+  hl/˜↩hm⋄hm↩hm⌾(hf⊸/)hf
+  "Header left argument without right"_err_(/HF) ha>hc+`⊸⊏hx∾0
+  hx∨↩1=hr
+  hid←vi‿nv M˜ ht←hm/𝕩
+  "Header operation must be name or valid self-reference (𝕊 or 𝕣)"_err_(/HM) hid<ht≠(⊑bI)+3×1-˜2⌊hr
+  "Only special name inputs allowed in headers for now!"_err_((HO∨HA)//∘HF) ¬bI M˜(ho∨ha)/hf/𝕩
+  hu←(𝕩 M bI)<hf∧0<rr
 
+  # Block properties
   HS←H((0‿3‿5‿6+⊑bI)⍋𝕩)⊸=⋄sp←/hf<𝕩 M bI     # Has-special (𝕤𝕩𝕨/𝕣𝕗/𝕘); indices of specials
   fx←HS 1⋄fr←(fx∨0⊸<)⊸+ft←2(⊣⌈2×⊢)○HS 3     # Body immediacy ¬fx, type ft, role fr
-  "Invalid special names for block header"_err_(/CB) 1↓ch∧hr<fr
-  ft⌈↩1-˜fr⌈↩ch×hr⋄fx⌈↩ch∧1=fr
+  "Invalid special names for block header"_err_(ch/0∾/∘CB) (hr<ch/fr)∨hl<hx<ch/fx
+  ft⌈↩1-˜fr↩hr⌾(ch⊸/)fr⋄fx↩hx⊸⌈⌾(ch⊸/)fx
   "Special name outside of any block"_err_(/{(0=fi)∧𝕩 M bI}∘𝕩) 0<⊑fr
   "Only blocks with explicit arguments can have multiple bodies"_err_(/CB) 1↓cm>fx
   "Block bodies must be of the same kind"_err_(/CB) 1↓cf<»⊸≠ft
@@ -204,7 +217,7 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
   tr←1≤er←ir⊏˜IT»ps                         # er: expression role; tr: train or modifier expression
   no←0⌈-ir⋄ne←0⌈-er⋄nei↩g⋄nx⊏˜↩gr           # Nothing value; expression
   "Nothing (·) cannot be assigned"_nerr ne×a
-  oa←⌽/op←(er<2)∧r≥2⋄ro←op∨«op∧m2←r=3       # op: active modifiers; ro: mod or right operand
+  oa←⌽/hf<op←(er<2)∧r≥2⋄ro←op∨«op∧m2←r=3    # op: active modifiers; ro: mod or right operand
   "Missing operand"_nerr op×2(«⌈m2×»)no⌈2×m2≥ro∨r∊↕2
   s←𝕩=sep⋄fo←𝕩=2+⊑bB⋄ls←s∧fo<○IT lo←𝕩=4+⊑bB # List Separators: after ⟨lo, not {fo
   fc←𝕩=1+⊑bH
@@ -224,7 +237,7 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
   nn←fo+`⊸⊏fw⋄no(⊣-=)↩nn⋄ne(⊣-=)↩nn         # fw indicates 𝕨 is never Nothing
   "Assignment target must be a name or list of targets"_err_(G) (a∨aid∨ps∨𝕩(=⟜(3+⊑)<M)bB)<aa
   "Can't nest assignments (write aliases with ⇐)"_err_(ai⊏G) (ak=2)<ai⊏aa
-  "Can't use result of function/modifier assignment without parentheses"_err_(G) (0<er)∧(0≤r)∧»⊸>aa
+  "Can't use result of function/modifier assignment without parentheses"_err_(G) hf<(0<er)∧(0≤r)∧»⊸>aa
   af>↩alm←ai⊏aa⋄al←alm/ai                   # aliases al
 
   # Lexical resolution (independent of parsing part 2 below)
@@ -261,7 +274,7 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
 
   # Parsing part 2
   ta←tr∧2(>∨|)ps(⊢-T)+`¬ro                  # Train argument (first-level)
-  fa←/(fe←ta∨ro∨«⊸∨ps<aa)<ff←(r=1)∨»op      # Active functions: cases fe are excluded
+  fa←/(fe←hf∨ta∨ro∨«⊸∨ps<aa)<ff←(r=1)∨»op   # Active functions: cases fe are excluded
   "Second-level parts of a train must be functions"_err_(G) tr>fe∨ff
   dy←2≠ny←fa⊏2«no⌈2×¬(tr∧r≥0)∨ro<r=0        # Dyadic
   ob←pr⊏/¯1(⊢-»)u←⍷∧pr←𝕩⊏˜pi←/𝕩<sep         # Objects to be loaded
diff --git a/test/cases/header.bqn b/test/cases/header.bqn
index 903fd5d6..df50797a 100644
--- a/test/cases/header.bqn
+++ b/test/cases/header.bqn
@@ -33,14 +33,34 @@
 5 % -{imm:a←4,a-9}
 3 % a←1⋄a+{v:a←2⋄b←3⋄a}
 ! % {l:1+l}
+! % {𝕤:2+2}
 2 % {R:1(⊣R⍟(¬𝕨⊣0)+)𝕩}0
 1 % {F:𝕤≡f}˜@
 1 % F←{F:!0},1
 0 % {F:𝕤↩↕2⋄=f}¯1
 1 % {𝕊:𝕤↩↕2⋄=𝕤}¯1
 1 % {𝕊:-𝕩}¯1
+! % {𝔽:-𝕩}¯1
 1 % {Fn:𝕨-𝕩}¯1
 4 % 3{Fn:𝕨-𝕩}¯1
 4 % ×{_m:𝔽˜𝕩}2
 3 % 12{_𝕣_:𝕗÷𝕘}4
 3 % ¯3{_m_:-𝕗}2
+
+# Syntax
+! % {-𝕩:𝕩}
+! % {F𝔽: ÷𝕗}
+! % {_𝕣𝕗:0}
+! % {_m𝕘:1}
+! % {·_𝕣:-1}
+! % {𝕗_𝕣_𝕘:𝕨‿𝕩}
+#! % {𝕘_𝕣_𝕗:𝕣}
+! % {,𝕨𝕊𝕊𝕩:{𝕩+1}𝕨}
+
+# Headers
+5 % {𝕨𝕊𝕩:1+𝕩}4
+2 % {𝕨Fn𝕩:1(⊣Fn⍟(¬𝕨⊣0)+)𝕩}0
+8 % 4{𝔽_m:2×𝕗}
+6 % ×˜{𝔽_m𝕩:𝔽⊸-𝕩}3
+8 % 1{𝕗_m:5{𝕩_m}⍟>2×𝕗}
+2 % 0.5 {𝕗_c_𝔾,:𝔾𝕗,} ÷
author	Marshall Lochbaum <mwlochbaum@gmail.com>	2021-08-10 14:43:11 -0400
committer	Marshall Lochbaum <mwlochbaum@gmail.com>	2021-08-10 14:43:11 -0400
commit	f2c141572c5728a067d829b91c6722c07c2a49dc (patch)
tree	da7681b2c3b14281d56769b1251e935a8959f0f0
parent	acf90b32360c310c340965d41af30ffcb66ded04 (diff)