From b48e1b2ff799991bc5a444f72909a5be1dc54e3a Mon Sep 17 00:00:00 2001
From: Ronald Tse <ronald.tse@ribose.com>
Date: Wed, 30 Sep 2026 18:22:33 +0800
Subject: [PATCH 1/2] fix: alias-declaration stop guard in the item
 continuation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The Ruby grammar's item_continuation checks (identifier ws? '=')-
absent — without it the first alias value's concatenation swallowed
the next alias declaration (srp_multichar = any([...]) ate
srp_latupper...), failing six corpus maps (alalc-srp, bgnpcgn-rus-1947,
bgnpcgn-srp-2005, din-grc, moct-kor, var-kor). Gate: 280/285.
---
 isc.artifact.json                    | 2 +-
 lib/interscript/isc/grammar/isc.parg | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/isc.artifact.json b/isc.artifact.json
index 712cb792..7aae06a4 100644
--- a/isc.artifact.json
+++ b/isc.artifact.json
@@ -1 +1 @@
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first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 4 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 5 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 6 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 7 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 8 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 8 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 9 and 10 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 9 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 10 and 11 are order-dependent (first set not statically known)","rule constraint: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule rule: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule comment_item: branches 1 and 2 are order-dependent (first set not statically known)"]},"default_entry":"isc","render":{},"derive":{},"tests":[],"docs":{},"source":"# Interscript ISC grammar — parsanol grammar language (PG).\n#\n# Line-oriented port of lib/interscript/isc/grammar/concerns/*.rb.\n# The capture tree must reproduce the Ruby-DSL parser's tree exactly:\n#   - repetitions are ABNF prefixes (1*x, *x)\n#   - negation is !x, positive lookahead is &x\n#   - captures at use sites (rule_ref as name) nest inner captures\n#     the same way parslet .as does\n#\n# Consumed by the interscript gem (artifact parse) and parsanol npm.\n\ngrammar InterscriptIsc version \"0.1.0\" {\n\n  # -- lexical primitives -------------------------------------------------\n\n  chr = %x00-10FFFF\n  space_char = %x20 / %x09 / %x0A / %x0B / %x0C / %x0D\n  newline = %x0D.0A / %x0A / %x0D\n  line_comment = \"#\" *(!(newline) chr)\n  whitespace = 1*(space_char / line_comment)\n  ws = *(space_char / line_comment)\n  inline_space = 1*(%x20 / %x09)\n  inline_ws = *(inline_space / line_comment)\n  hexd = %x30-39 / %x41-46 / %x61-66\n  digit = %x30-39\n\n  ident_first = %x41-5A / %x61-7A / %x5F\n  ident_rest = %x41-5A / %x61-7A / %x30-39 / %x5F\n  identifier = (ident_first 0*ident_rest) as identifier\n\n  keyword = \"parallel\" / \"sequence\" / \"stage\" / \"compose\" / \"separate\" / \"system\" / \"metadata\" / \"aliases\" / \"tests\" / \"notes\" / \"description\" / \"any_character\" / \"authority\" / \"dependency\" / \"run\" / \"sub\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"any\" / \"none\" / \"boundary\" / \"line_start\" / \"line_end\" / \"word_boundary\" / \"downcase\" / \"upcase\" / \"title_case\" / \"capture\" / \"maybe\" / \"some\" / \"ref\" / \"name\"\n\n  # -- string literals ----------------------------------------------------\n\n  esc_nl = (\"n\") as newline\n  esc_cr = (\"r\") as carriage_return\n  esc_tab = (\"t\") as tab\n  esc_dq = \"\\\"\" as dquote\n  esc_bs = \"\\\\\" as backslash\n  esc_uni4 = \"u\" (4hexd) as unicode\n  esc_uni8 = \"U\" (8hexd) as unicode\n  escape_sequence = \"\\\\\" (esc_nl / esc_cr / esc_tab / esc_dq / esc_bs / esc_uni4 / esc_uni8)\n\n  raw_run = 1*(!(\"\\\\\" / \"\\\"\") chr)\n  dq_parts = *(escape_sequence / (raw_run as run))\n  double_quoted = \"\\\"\" (dq_parts as string) \"\\\"\"\n  sq_body = *(!\"'\" chr)\n  single_quoted = \"'\" (sq_body as string) \"'\"\n  quoted_string = double_quoted / single_quoted\n\n  arrow = [whitespace] \"->\" [whitespace]\n  comma_ws = \",\" [whitespace]\n\n  # -- metadata -----------------------------------------------------------\n\n  md_authority = \"authority\" whitespace ((quoted_string) as authority)\n  md_source_spelling = \"source_spelling\" whitespace ((quoted_string) as source_spelling)\n  md_target_spelling = \"target_spelling\" whitespace ((quoted_string) as target_spelling)\n  md_identifying = \"identifying\" whitespace ((quoted_string) as identifying)\n  md_name = \"name\" whitespace ((quoted_string) as name)\n  md_spec_value = quoted_string as specification\n  md_specification = \"specification\" whitespace ((md_spec_value *(comma_ws md_spec_value)) as specification)\n  md_description = \"description\" [whitespace] \"{\" [ws] (raw_text as description) [ws] \"}\"\n  md_system_status = \"system_status\" whitespace ((\"current\" / \"former\" / \"inactive\") as system_status)\n  md_code_status = \"code_status\" whitespace ((\"preferred\" / \"proposed\" / \"deprecated\") as code_status)\n\n  relation_type = \"supersedes\" / \"superseded_by\" / \"based_on\" / \"basis_for\" / \"alias_of\" / \"adopted_from\" / \"related_to\"\n  relation_note = whitespace \"note\" whitespace (quoted_string as note)\n  relation_item = [whitespace] (relation_type as type) whitespace (quoted_string as system) [(relation_note)] [whitespace]\n  md_relations = \"relations\" [whitespace] \"{\" [ws] ((*(relation_item)) as relations) [ws] \"}\"\n\n  note_item = [whitespace] \"note\" [whitespace] (quoted_string as note) [whitespace]\n  md_notes = \"notes\" [whitespace] \"{\" [ws] ((*(note_item)) as notes) [ws] \"}\"\n\n  md_provenance_value = quoted_string as provenance\n  md_provenance = \"provenance\" [whitespace] ((md_provenance_value *(comma_ws md_provenance_value)) as provenance)\n\n  md_empty_field = &(newline)\n  md_raw_field_value = 1*(!%x0A !\"}\" !\"{\" chr)\n  md_field_value = quoted_string / (md_raw_field_value as raw)\n  md_field_block = \"{\" [ws] (raw_text as field_block) [ws] \"}\"\n  md_generic_field = (identifier as field_name) inline_ws ((md_field_value as field_value) / md_field_block / md_empty_field)\n\n  metadata_field = [whitespace] (md_description / md_relations / md_system_status / md_code_status / md_specification / md_notes / md_provenance / md_generic_field) [whitespace]\n  md_items = *(metadata_field)\n  metadata_block = \"metadata\" [whitespace] \"{\" [ws] (md_items as metadata) [ws] \"}\"\n\n  raw_text = *(\"\\\\\" chr / (!\"}\" chr))\n\n  # -- aliases ------------------------------------------------------------\n\n  alias_decl = [whitespace] (identifier as name) [whitespace] \"=\" [whitespace] (item as value) [whitespace]\n  alias_items = *(alias_decl)\n  aliases_block = \"aliases\" [whitespace] \"{\" [ws] (alias_items as aliases) [ws] \"}\"\n\n  # -- dependencies -------------------------------------------------------\n\n  dep_alias = whitespace \"as\" whitespace (identifier as alias)\n  dependency_decl = \"dependency\" whitespace (quoted_string as target) [(dep_alias)]\n\n  # -- item expressions ---------------------------------------------------\n\n  zw_primitive = ((\"boundary\") / (\"line_start\") / (\"line_end\") / (\"word_boundary\") / (\"space\") / (\"non_boundary\")) as primitive\n  fn_lit = ((\"upcase\") / (\"downcase\") / (\"title_case\") / (\"reverse\") / (\"strip\") / (\"swapcase\")) as function\n  any_char_lit = (\"any_character\") as any_char\n  none_lit = (\"none\") as none\n\n  digit_cap = digit as digit\n  capture_reference_body = \"ref\" \"(\" [ws] digit_cap [ws] \")\"\n  capture_reference = capture_reference_body as ref\n\n  item_ref = identifier \".\" (identifier as qualified_name)\n  alias_reference = (!(keyword) identifier [(\".\" (identifier as qualified_name))] !\"{\" ) as alias\n\n  item_seq = item_atom\n  item_sep = ([ws] \"+\" [ws]) / whitespace\n  item_cont = &item_atom\n\n  range_arg = (quoted_string as lo) [ws] \"..\" [ws] (quoted_string as hi)\n  list_item = item\n  list_items = (list_item *((comma_ws / whitespace) list_item))\n  set_arg = ((quoted_string as single)) / (\"[\" [ws] ((list_item *((comma_ws / whitespace) list_item)) as list) [ws] \"]\")\n  alias_arg = (!zw_primitive !(keyword) identifier) as alias_ref\n  any_arg = range_arg / set_arg / alias_arg\n  any_ctor = \"any\" \"(\" [ws] (any_arg as any) [ws] \")\"\n  capture_ctor = \"capture\" \"(\" [ws] (item as capture_inner) [ws] \")\"\n  maybe_ctor = \"maybe\" \"(\" [ws] (item as maybe_inner) [ws] \")\"\n  some_ctor = \"some\" \"(\" [ws] (item as some_inner) [ws] \")\"\n\n  item_atom_start = \"\\\"\" / \"'\" / ident_first\n  cont_stop = \"to\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"}\"\n  item_atom = quoted_string / none_lit / zw_primitive / any_char_lit / any_ctor / capture_ctor / maybe_ctor / some_ctor / fn_lit / capture_reference / alias_reference\n  item = (item_atom 0*(item_sep !cont_stop &item_atom_start item_atom)) as concatenation\n\n  # -- rules and stages ---------------------------------------------------\n\n  constraint_after = \"after\" whitespace (item as after)\n  constraint_before = \"before\" whitespace (item as before)\n  constraint_not_before = \"not_before\" whitespace (item as not_before)\n  constraint_not_after = \"not_after\" whitespace (item as not_after)\n  constraint = constraint_after / constraint_before / constraint_not_before / constraint_not_after\n  constraints = *(whitespace constraint)\n\n  compact_rule = \"sub\" whitespace (item_atom as from) whitespace (item_atom as to) ((*(whitespace constraint)) as constraints)\n\n  block_rule = \"sub\" [ws] \"{\" [ws] \"from\" whitespace (item as from) [ws] \"to\" whitespace (item as to) ((*(whitespace constraint)) as constraints) [ws] \"}\"\n\n  rule = block_rule / compact_rule\n\n  comment_item = ((\"#\" *(!%x0A chr)) as comment) / ((!(keyword) identifier) as noop)\n  rule_line = [ws] (rule / comment_item) [ws]\n  rule_items = *(rule_line)\n  sequence_block = \"sequence\" [ws] \"{\" [ws] (rule_items as sequence) [ws] \"}\"\n  parallel_block = \"parallel\" [ws] \"{\" [ws] (rule_items as parallel) [ws] \"}\"\n\n  separator_part = whitespace \"separator\" whitespace (item_atom as separator)\n  separate_directive = (\"separate\") as separate [(separator_part)]\n  case_directive = ((\"downcase\") / (\"upcase\")) as case\n  case_kwargs_part = whitespace (kwarg_list as case_kwargs)\n  title_case_directive = (\"title_case\") as case [(case_kwargs_part)]\n  string_case_directive = case_directive / title_case_directive\n  compose_directive = ((\"compose\") / (\"decompose\")) as compose\n  kwarg = (identifier as kwarg_name) [ws] \":\" [ws] ((quoted_string) as kwarg_value)\n  kwarg_item = (kwarg) as kwarg\n  kwarg_list = (kwarg_item *(comma_ws kwarg_item))\n  funcall_kwargs_part = whitespace (kwarg_list as funcall_kwargs)\n  rababa_directive = (\"rababa\") as funcall_name [(funcall_kwargs_part)]\n  run_dep = \"map.\" (identifier as dep) \".stage.\" (identifier as stage)\n  run_stage_only = (\"stage.\" (identifier as stage)) as run_stage_only\n  run_rule = \"run\" whitespace ((run_dep) / run_stage_only)\n\n  bare_rule = (rule) as bare_rule\n  stage_item = [ws] (sequence_block / parallel_block / run_rule / separate_directive / string_case_directive / compose_directive / rababa_directive / bare_rule / comment_item) [ws]\n  stage_items = *(stage_item)\n  stage_name_paren = \"(\" (identifier as stage_name) \")\"\n  stage_name_ws = whitespace (identifier as stage_name)\n  stage_block = \"stage\" (stage_name_paren / stage_name_ws) [ws] \"{\" [ws] (stage_items as stage) [ws] \"}\"\n\n  # -- tests ---------------------------------------------------------------\n\n  test_note = whitespace \"note\" whitespace (quoted_string as note)\n  test_line = [whitespace] (quoted_string as input) arrow (quoted_string as expected) [(test_note)] [whitespace]\n  test_items = *(test_line)\n  tests_block = \"tests\" [whitespace] \"{\" [ws] (test_items as tests) [ws] \"}\"\n\n  # -- system --------------------------------------------------------------\n\n  block_item = [whitespace] (metadata_block / aliases_block / tests_block / stage_block / dependency_decl) [whitespace]\n  body_items = *(block_item)\n  system_block = \"system\" whitespace ((quoted_string) as system_code) [whitespace] \"{\" [ws] ((*(block_item)) as body) [ws] \"}\" [whitespace]\n  isc_source = [whitespace] ((system_block) as system) [whitespace]\n\n  entry isc: isc_source\n}\n","checksum":"sha256:5191a1c12a17071f604b0f09506439c7c52f0d85484591da0a4f02654349b8e1"}
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newline: branches 1 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 4 and 30 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 7 and 31 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 12 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 9 and 29 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 19 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 14 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 14 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 15 and 33 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 16 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 17 and 23 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 18 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 22 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 24 and 25 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule md_field_value: branches 1 and 2 are order-dependent (first set not statically known)","rule item_sep: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 3 are order-dependent (first set not statically known)","rule any_arg: branches 2 and 3 are order-dependent (first set not statically known)","rule cont_stop: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 1 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 2 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 3 and 8 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 4 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 5 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 6 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 7 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 8 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 8 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 9 and 10 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 9 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 10 and 11 are order-dependent (first set not statically known)","rule constraint: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule rule: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule comment_item: branches 1 and 2 are order-dependent (first set not statically known)"]},"default_entry":"isc","render":{},"derive":{},"tests":[],"docs":{},"source":"# Interscript ISC grammar — parsanol grammar language (PG).\n#\n# Line-oriented port of lib/interscript/isc/grammar/concerns/*.rb.\n# The capture tree must reproduce the Ruby-DSL parser's tree exactly:\n#   - repetitions are ABNF prefixes (1*x, *x)\n#   - negation is !x, positive lookahead is &x\n#   - captures at use sites (rule_ref as name) nest inner captures\n#     the same way parslet .as does\n#\n# Consumed by the interscript gem (artifact parse) and parsanol npm.\n\ngrammar InterscriptIsc version \"0.1.0\" {\n\n  # -- lexical primitives -------------------------------------------------\n\n  chr = %x00-10FFFF\n  space_char = %x20 / %x09 / %x0A / %x0B / %x0C / %x0D\n  newline = %x0D.0A / %x0A / %x0D\n  line_comment = \"#\" *(!(newline) chr)\n  whitespace = 1*(space_char / line_comment)\n  ws = *(space_char / line_comment)\n  inline_space = 1*(%x20 / %x09)\n  inline_ws = *(inline_space / line_comment)\n  hexd = %x30-39 / %x41-46 / %x61-66\n  digit = %x30-39\n\n  ident_first = %x41-5A / %x61-7A / %x5F\n  ident_rest = %x41-5A / %x61-7A / %x30-39 / %x5F\n  identifier = (ident_first 0*ident_rest) as identifier\n\n  keyword = \"parallel\" / \"sequence\" / \"stage\" / \"compose\" / \"separate\" / \"system\" / \"metadata\" / \"aliases\" / \"tests\" / \"notes\" / \"description\" / \"any_character\" / \"authority\" / \"dependency\" / \"run\" / \"sub\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"any\" / \"none\" / \"boundary\" / \"line_start\" / \"line_end\" / \"word_boundary\" / \"downcase\" / \"upcase\" / \"title_case\" / \"capture\" / \"maybe\" / \"some\" / \"ref\" / \"name\"\n\n  # -- string literals ----------------------------------------------------\n\n  esc_nl = (\"n\") as newline\n  esc_cr = (\"r\") as carriage_return\n  esc_tab = (\"t\") as tab\n  esc_dq = \"\\\"\" as dquote\n  esc_bs = \"\\\\\" as backslash\n  esc_uni4 = \"u\" (4hexd) as unicode\n  esc_uni8 = \"U\" (8hexd) as unicode\n  escape_sequence = \"\\\\\" (esc_nl / esc_cr / esc_tab / esc_dq / esc_bs / esc_uni4 / esc_uni8)\n\n  raw_run = 1*(!(\"\\\\\" / \"\\\"\") chr)\n  dq_parts = *(escape_sequence / (raw_run as run))\n  double_quoted = \"\\\"\" (dq_parts as string) \"\\\"\"\n  sq_body = *(!\"'\" chr)\n  single_quoted = \"'\" (sq_body as string) \"'\"\n  quoted_string = double_quoted / single_quoted\n\n  arrow = [whitespace] \"->\" [whitespace]\n  comma_ws = \",\" [whitespace]\n\n  # -- metadata -----------------------------------------------------------\n\n  md_authority = \"authority\" whitespace ((quoted_string) as authority)\n  md_source_spelling = \"source_spelling\" whitespace ((quoted_string) as source_spelling)\n  md_target_spelling = \"target_spelling\" whitespace ((quoted_string) as target_spelling)\n  md_identifying = \"identifying\" whitespace ((quoted_string) as identifying)\n  md_name = \"name\" whitespace ((quoted_string) as name)\n  md_spec_value = quoted_string as specification\n  md_specification = \"specification\" whitespace ((md_spec_value *(comma_ws md_spec_value)) as specification)\n  md_description = \"description\" [whitespace] \"{\" [ws] (raw_text as description) [ws] \"}\"\n  md_system_status = \"system_status\" whitespace ((\"current\" / \"former\" / \"inactive\") as system_status)\n  md_code_status = \"code_status\" whitespace ((\"preferred\" / \"proposed\" / \"deprecated\") as code_status)\n\n  relation_type = \"supersedes\" / \"superseded_by\" / \"based_on\" / \"basis_for\" / \"alias_of\" / \"adopted_from\" / \"related_to\"\n  relation_note = whitespace \"note\" whitespace (quoted_string as note)\n  relation_item = [whitespace] (relation_type as type) whitespace (quoted_string as system) [(relation_note)] [whitespace]\n  md_relations = \"relations\" [whitespace] \"{\" [ws] ((*(relation_item)) as relations) [ws] \"}\"\n\n  note_item = [whitespace] \"note\" [whitespace] (quoted_string as note) [whitespace]\n  md_notes = \"notes\" [whitespace] \"{\" [ws] ((*(note_item)) as notes) [ws] \"}\"\n\n  md_provenance_value = quoted_string as provenance\n  md_provenance = \"provenance\" [whitespace] ((md_provenance_value *(comma_ws md_provenance_value)) as provenance)\n\n  md_empty_field = &(newline)\n  md_raw_field_value = 1*(!%x0A !\"}\" !\"{\" chr)\n  md_field_value = quoted_string / (md_raw_field_value as raw)\n  md_field_block = \"{\" [ws] (raw_text as field_block) [ws] \"}\"\n  md_generic_field = (identifier as field_name) inline_ws ((md_field_value as field_value) / md_field_block / md_empty_field)\n\n  metadata_field = [whitespace] (md_description / md_relations / md_system_status / md_code_status / md_specification / md_notes / md_provenance / md_generic_field) [whitespace]\n  md_items = *(metadata_field)\n  metadata_block = \"metadata\" [whitespace] \"{\" [ws] (md_items as metadata) [ws] \"}\"\n\n  raw_text = *(\"\\\\\" chr / (!\"}\" chr))\n\n  # -- aliases ------------------------------------------------------------\n\n  alias_decl = [whitespace] (identifier as name) [whitespace] \"=\" [whitespace] (item as value) [whitespace]\n  alias_items = *(alias_decl)\n  aliases_block = \"aliases\" [whitespace] \"{\" [ws] (alias_items as aliases) [ws] \"}\"\n\n  # -- dependencies -------------------------------------------------------\n\n  dep_alias = whitespace \"as\" whitespace (identifier as alias)\n  dependency_decl = \"dependency\" whitespace (quoted_string as target) [(dep_alias)]\n\n  # -- item expressions ---------------------------------------------------\n\n  zw_primitive = ((\"boundary\") / (\"line_start\") / (\"line_end\") / (\"word_boundary\") / (\"space\") / (\"non_boundary\")) as primitive\n  fn_lit = ((\"upcase\") / (\"downcase\") / (\"title_case\") / (\"reverse\") / (\"strip\") / (\"swapcase\")) as function\n  any_char_lit = (\"any_character\") as any_char\n  none_lit = (\"none\") as none\n\n  digit_cap = digit as digit\n  capture_reference_body = \"ref\" \"(\" [ws] digit_cap [ws] \")\"\n  capture_reference = capture_reference_body as ref\n\n  item_ref = identifier \".\" (identifier as qualified_name)\n  alias_reference = (!(keyword) identifier [(\".\" (identifier as qualified_name))] !\"{\" ) as alias\n\n  item_seq = item_atom\n  item_sep = ([ws] \"+\" [ws]) / whitespace\n  item_cont = &item_atom\n\n  range_arg = (quoted_string as lo) [ws] \"..\" [ws] (quoted_string as hi)\n  list_item = item\n  list_items = (list_item *((comma_ws / whitespace) list_item))\n  set_arg = ((quoted_string as single)) / (\"[\" [ws] ((list_item *((comma_ws / whitespace) list_item)) as list) [ws] \"]\")\n  alias_arg = (!zw_primitive !(keyword) identifier) as alias_ref\n  any_arg = range_arg / set_arg / alias_arg\n  any_ctor = \"any\" \"(\" [ws] (any_arg as any) [ws] \")\"\n  capture_ctor = \"capture\" \"(\" [ws] (item as capture_inner) [ws] \")\"\n  maybe_ctor = \"maybe\" \"(\" [ws] (item as maybe_inner) [ws] \")\"\n  some_ctor = \"some\" \"(\" [ws] (item as some_inner) [ws] \")\"\n\n  item_atom_start = \"\\\"\" / \"'\" / ident_first\n  cont_stop = \"to\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"}\"\n  alias_decl_stop = identifier [ws] \"=\"\n  item_atom = quoted_string / none_lit / zw_primitive / any_char_lit / any_ctor / capture_ctor / maybe_ctor / some_ctor / fn_lit / capture_reference / alias_reference\n  item = (item_atom 0*(item_sep !cont_stop !(alias_decl_stop) &item_atom_start item_atom)) as concatenation\n\n  # -- rules and stages ---------------------------------------------------\n\n  constraint_after = \"after\" whitespace (item as after)\n  constraint_before = \"before\" whitespace (item as before)\n  constraint_not_before = \"not_before\" whitespace (item as not_before)\n  constraint_not_after = \"not_after\" whitespace (item as not_after)\n  constraint = constraint_after / constraint_before / constraint_not_before / constraint_not_after\n  constraints = *(whitespace constraint)\n\n  compact_rule = \"sub\" whitespace (item_atom as from) whitespace (item_atom as to) ((*(whitespace constraint)) as constraints)\n\n  block_rule = \"sub\" [ws] \"{\" [ws] \"from\" whitespace (item as from) [ws] \"to\" whitespace (item as to) ((*(whitespace constraint)) as constraints) [ws] \"}\"\n\n  rule = block_rule / compact_rule\n\n  comment_item = ((\"#\" *(!%x0A chr)) as comment) / ((!(keyword) identifier) as noop)\n  rule_line = [ws] (rule / comment_item) [ws]\n  rule_items = *(rule_line)\n  sequence_block = \"sequence\" [ws] \"{\" [ws] (rule_items as sequence) [ws] \"}\"\n  parallel_block = \"parallel\" [ws] \"{\" [ws] (rule_items as parallel) [ws] \"}\"\n\n  separator_part = whitespace \"separator\" whitespace (item_atom as separator)\n  separate_directive = (\"separate\") as separate [(separator_part)]\n  case_directive = ((\"downcase\") / (\"upcase\")) as case\n  case_kwargs_part = whitespace (kwarg_list as case_kwargs)\n  title_case_directive = (\"title_case\") as case [(case_kwargs_part)]\n  string_case_directive = case_directive / title_case_directive\n  compose_directive = ((\"compose\") / (\"decompose\")) as compose\n  kwarg = (identifier as kwarg_name) [ws] \":\" [ws] ((quoted_string) as kwarg_value)\n  kwarg_item = (kwarg) as kwarg\n  kwarg_list = (kwarg_item *(comma_ws kwarg_item))\n  funcall_kwargs_part = whitespace (kwarg_list as funcall_kwargs)\n  rababa_directive = (\"rababa\") as funcall_name [(funcall_kwargs_part)]\n  run_dep = \"map.\" (identifier as dep) \".stage.\" (identifier as stage)\n  run_stage_only = (\"stage.\" (identifier as stage)) as run_stage_only\n  run_rule = \"run\" whitespace ((run_dep) / run_stage_only)\n\n  bare_rule = (rule) as bare_rule\n  stage_item = [ws] (sequence_block / parallel_block / run_rule / separate_directive / string_case_directive / compose_directive / rababa_directive / bare_rule / comment_item) [ws]\n  stage_items = *(stage_item)\n  stage_name_paren = \"(\" (identifier as stage_name) \")\"\n  stage_name_ws = whitespace (identifier as stage_name)\n  stage_block = \"stage\" (stage_name_paren / stage_name_ws) [ws] \"{\" [ws] (stage_items as stage) [ws] \"}\"\n\n  # -- tests ---------------------------------------------------------------\n\n  test_note = whitespace \"note\" whitespace (quoted_string as note)\n  test_line = [whitespace] (quoted_string as input) arrow (quoted_string as expected) [(test_note)] [whitespace]\n  test_items = *(test_line)\n  tests_block = \"tests\" [whitespace] \"{\" [ws] (test_items as tests) [ws] \"}\"\n\n  # -- system --------------------------------------------------------------\n\n  block_item = [whitespace] (metadata_block / aliases_block / tests_block / stage_block / dependency_decl) [whitespace]\n  body_items = *(block_item)\n  system_block = \"system\" whitespace ((quoted_string) as system_code) [whitespace] \"{\" [ws] ((*(block_item)) as body) [ws] \"}\" [whitespace]\n  isc_source = [whitespace] ((system_block) as system) [whitespace]\n\n  entry isc: isc_source\n}\n","checksum":"sha256:ea8e10a7e32e4579989b081c3bf77384a96967e43c56755c57b50470a96350ad"}
diff --git a/lib/interscript/isc/grammar/isc.parg b/lib/interscript/isc/grammar/isc.parg
index fd8e710b..77df2c03 100644
--- a/lib/interscript/isc/grammar/isc.parg
+++ b/lib/interscript/isc/grammar/isc.parg
@@ -129,8 +129,9 @@ grammar InterscriptIsc version "0.1.0" {
 
   item_atom_start = "\"" / "'" / ident_first
   cont_stop = "to" / "before" / "after" / "not_before" / "not_after" / "}"
+  alias_decl_stop = identifier [ws] "="
   item_atom = quoted_string / none_lit / zw_primitive / any_char_lit / any_ctor / capture_ctor / maybe_ctor / some_ctor / fn_lit / capture_reference / alias_reference
-  item = (item_atom 0*(item_sep !cont_stop &item_atom_start item_atom)) as concatenation
+  item = (item_atom 0*(item_sep !cont_stop !(alias_decl_stop) &item_atom_start item_atom)) as concatenation
 
   # -- rules and stages ---------------------------------------------------
 

From a4287b42b5d263627665dcef59cef12c6023078b Mon Sep 17 00:00:00 2001
From: Ronald Tse <ronald.tse@ribose.com>
Date: Wed, 30 Sep 2026 18:27:07 +0800
Subject: [PATCH 2/2] fix: accept 4-hex-digit \U escapes

The corpus converter emits \U040E-style escapes (gki-bel, mvd-bel,
odni-bel); the Ruby grammar demanded 8 hex digits for \U and rejected
the files. Accept 4..8 in both the DSL grammar and the .parg.
Gate: 283/285 (remaining: un-mar has converter-corrupted escape output
needing a maps-repo fix; odni-kor has a 2-element comment-parallel
capture delta).
---
 isc.artifact.json                                  | 2 +-
 lib/interscript/isc/grammar/concerns/primitives.rb | 5 ++++-
 lib/interscript/isc/grammar/isc.parg               | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/isc.artifact.json b/isc.artifact.json
index 7aae06a4..cd7c45b9 100644
--- a/isc.artifact.json
+++ b/isc.artifact.json
@@ -1 +1 @@
-{"version":"0.1.0","grammar":"InterscriptIsc","shape":"parsanol-tree/v2","binding_version":1,"entries":{"isc":{"root":"isc_source","grammar":{"atoms":[{"Entity":{"atom":25}},{"Entity":{"atom":8}},{"Re":{"pattern":"[ 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newline: branches 1 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 4 and 30 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 7 and 31 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 12 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 9 and 29 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 19 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 14 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 14 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 15 and 33 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 16 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 17 and 23 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 18 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 22 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 24 and 25 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule md_field_value: branches 1 and 2 are order-dependent (first set not statically known)","rule item_sep: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 3 are order-dependent (first set not statically known)","rule any_arg: branches 2 and 3 are order-dependent (first set not statically known)","rule cont_stop: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 1 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 2 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 3 and 8 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 4 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 5 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 6 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 7 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 8 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 8 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 9 and 10 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 9 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 10 and 11 are order-dependent (first set not statically known)","rule constraint: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule rule: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule comment_item: branches 1 and 2 are order-dependent (first set not statically known)"]},"default_entry":"isc","render":{},"derive":{},"tests":[],"docs":{},"source":"# Interscript ISC grammar — parsanol grammar language (PG).\n#\n# Line-oriented port of lib/interscript/isc/grammar/concerns/*.rb.\n# The capture tree must reproduce the Ruby-DSL parser's tree exactly:\n#   - repetitions are ABNF prefixes (1*x, *x)\n#   - negation is !x, positive lookahead is &x\n#   - captures at use sites (rule_ref as name) nest inner captures\n#     the same way parslet .as does\n#\n# Consumed by the interscript gem (artifact parse) and parsanol npm.\n\ngrammar InterscriptIsc version \"0.1.0\" {\n\n  # -- lexical primitives -------------------------------------------------\n\n  chr = %x00-10FFFF\n  space_char = %x20 / %x09 / %x0A / %x0B / %x0C / %x0D\n  newline = %x0D.0A / %x0A / %x0D\n  line_comment = \"#\" *(!(newline) chr)\n  whitespace = 1*(space_char / line_comment)\n  ws = *(space_char / line_comment)\n  inline_space = 1*(%x20 / %x09)\n  inline_ws = *(inline_space / line_comment)\n  hexd = %x30-39 / %x41-46 / %x61-66\n  digit = %x30-39\n\n  ident_first = %x41-5A / %x61-7A / %x5F\n  ident_rest = %x41-5A / %x61-7A / %x30-39 / %x5F\n  identifier = (ident_first 0*ident_rest) as identifier\n\n  keyword = \"parallel\" / \"sequence\" / \"stage\" / \"compose\" / \"separate\" / \"system\" / \"metadata\" / \"aliases\" / \"tests\" / \"notes\" / \"description\" / \"any_character\" / \"authority\" / \"dependency\" / \"run\" / \"sub\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"any\" / \"none\" / \"boundary\" / \"line_start\" / \"line_end\" / \"word_boundary\" / \"downcase\" / \"upcase\" / \"title_case\" / \"capture\" / \"maybe\" / \"some\" / \"ref\" / \"name\"\n\n  # -- string literals ----------------------------------------------------\n\n  esc_nl = (\"n\") as newline\n  esc_cr = (\"r\") as carriage_return\n  esc_tab = (\"t\") as tab\n  esc_dq = \"\\\"\" as dquote\n  esc_bs = \"\\\\\" as backslash\n  esc_uni4 = \"u\" (4hexd) as unicode\n  esc_uni8 = \"U\" (8hexd) as unicode\n  escape_sequence = \"\\\\\" (esc_nl / esc_cr / esc_tab / esc_dq / esc_bs / esc_uni4 / esc_uni8)\n\n  raw_run = 1*(!(\"\\\\\" / \"\\\"\") chr)\n  dq_parts = *(escape_sequence / (raw_run as run))\n  double_quoted = \"\\\"\" (dq_parts as string) \"\\\"\"\n  sq_body = *(!\"'\" chr)\n  single_quoted = \"'\" (sq_body as string) \"'\"\n  quoted_string = double_quoted / single_quoted\n\n  arrow = [whitespace] \"->\" [whitespace]\n  comma_ws = \",\" [whitespace]\n\n  # -- metadata -----------------------------------------------------------\n\n  md_authority = \"authority\" whitespace ((quoted_string) as authority)\n  md_source_spelling = \"source_spelling\" whitespace ((quoted_string) as source_spelling)\n  md_target_spelling = \"target_spelling\" whitespace ((quoted_string) as target_spelling)\n  md_identifying = \"identifying\" whitespace ((quoted_string) as identifying)\n  md_name = \"name\" whitespace ((quoted_string) as name)\n  md_spec_value = quoted_string as specification\n  md_specification = \"specification\" whitespace ((md_spec_value *(comma_ws md_spec_value)) as specification)\n  md_description = \"description\" [whitespace] \"{\" [ws] (raw_text as description) [ws] \"}\"\n  md_system_status = \"system_status\" whitespace ((\"current\" / \"former\" / \"inactive\") as system_status)\n  md_code_status = \"code_status\" whitespace ((\"preferred\" / \"proposed\" / \"deprecated\") as code_status)\n\n  relation_type = \"supersedes\" / \"superseded_by\" / \"based_on\" / \"basis_for\" / \"alias_of\" / \"adopted_from\" / \"related_to\"\n  relation_note = whitespace \"note\" whitespace (quoted_string as note)\n  relation_item = [whitespace] (relation_type as type) whitespace (quoted_string as system) [(relation_note)] [whitespace]\n  md_relations = \"relations\" [whitespace] \"{\" [ws] ((*(relation_item)) as relations) [ws] \"}\"\n\n  note_item = [whitespace] \"note\" [whitespace] (quoted_string as note) [whitespace]\n  md_notes = \"notes\" [whitespace] \"{\" [ws] ((*(note_item)) as notes) [ws] \"}\"\n\n  md_provenance_value = quoted_string as provenance\n  md_provenance = \"provenance\" [whitespace] ((md_provenance_value *(comma_ws md_provenance_value)) as provenance)\n\n  md_empty_field = &(newline)\n  md_raw_field_value = 1*(!%x0A !\"}\" !\"{\" chr)\n  md_field_value = quoted_string / (md_raw_field_value as raw)\n  md_field_block = \"{\" [ws] (raw_text as field_block) [ws] \"}\"\n  md_generic_field = (identifier as field_name) inline_ws ((md_field_value as field_value) / md_field_block / md_empty_field)\n\n  metadata_field = [whitespace] (md_description / md_relations / md_system_status / md_code_status / md_specification / md_notes / md_provenance / md_generic_field) [whitespace]\n  md_items = *(metadata_field)\n  metadata_block = \"metadata\" [whitespace] \"{\" [ws] (md_items as metadata) [ws] \"}\"\n\n  raw_text = *(\"\\\\\" chr / (!\"}\" chr))\n\n  # -- aliases ------------------------------------------------------------\n\n  alias_decl = [whitespace] (identifier as name) [whitespace] \"=\" [whitespace] (item as value) [whitespace]\n  alias_items = *(alias_decl)\n  aliases_block = \"aliases\" [whitespace] \"{\" [ws] (alias_items as aliases) [ws] \"}\"\n\n  # -- dependencies -------------------------------------------------------\n\n  dep_alias = whitespace \"as\" whitespace (identifier as alias)\n  dependency_decl = \"dependency\" whitespace (quoted_string as target) [(dep_alias)]\n\n  # -- item expressions ---------------------------------------------------\n\n  zw_primitive = ((\"boundary\") / (\"line_start\") / (\"line_end\") / (\"word_boundary\") / (\"space\") / (\"non_boundary\")) as primitive\n  fn_lit = ((\"upcase\") / (\"downcase\") / (\"title_case\") / (\"reverse\") / (\"strip\") / (\"swapcase\")) as function\n  any_char_lit = (\"any_character\") as any_char\n  none_lit = (\"none\") as none\n\n  digit_cap = digit as digit\n  capture_reference_body = \"ref\" \"(\" [ws] digit_cap [ws] \")\"\n  capture_reference = capture_reference_body as ref\n\n  item_ref = identifier \".\" (identifier as qualified_name)\n  alias_reference = (!(keyword) identifier [(\".\" (identifier as qualified_name))] !\"{\" ) as alias\n\n  item_seq = item_atom\n  item_sep = ([ws] \"+\" [ws]) / whitespace\n  item_cont = &item_atom\n\n  range_arg = (quoted_string as lo) [ws] \"..\" [ws] (quoted_string as hi)\n  list_item = item\n  list_items = (list_item *((comma_ws / whitespace) list_item))\n  set_arg = ((quoted_string as single)) / (\"[\" [ws] ((list_item *((comma_ws / whitespace) list_item)) as list) [ws] \"]\")\n  alias_arg = (!zw_primitive !(keyword) identifier) as alias_ref\n  any_arg = range_arg / set_arg / alias_arg\n  any_ctor = \"any\" \"(\" [ws] (any_arg as any) [ws] \")\"\n  capture_ctor = \"capture\" \"(\" [ws] (item as capture_inner) [ws] \")\"\n  maybe_ctor = \"maybe\" \"(\" [ws] (item as maybe_inner) [ws] \")\"\n  some_ctor = \"some\" \"(\" [ws] (item as some_inner) [ws] \")\"\n\n  item_atom_start = \"\\\"\" / \"'\" / ident_first\n  cont_stop = \"to\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"}\"\n  alias_decl_stop = identifier [ws] \"=\"\n  item_atom = quoted_string / none_lit / zw_primitive / any_char_lit / any_ctor / capture_ctor / maybe_ctor / some_ctor / fn_lit / capture_reference / alias_reference\n  item = (item_atom 0*(item_sep !cont_stop !(alias_decl_stop) &item_atom_start item_atom)) as concatenation\n\n  # -- rules and stages ---------------------------------------------------\n\n  constraint_after = \"after\" whitespace (item as after)\n  constraint_before = \"before\" whitespace (item as before)\n  constraint_not_before = \"not_before\" whitespace (item as not_before)\n  constraint_not_after = \"not_after\" whitespace (item as not_after)\n  constraint = constraint_after / constraint_before / constraint_not_before / constraint_not_after\n  constraints = *(whitespace constraint)\n\n  compact_rule = \"sub\" whitespace (item_atom as from) whitespace (item_atom as to) ((*(whitespace constraint)) as constraints)\n\n  block_rule = \"sub\" [ws] \"{\" [ws] \"from\" whitespace (item as from) [ws] \"to\" whitespace (item as to) ((*(whitespace constraint)) as constraints) [ws] \"}\"\n\n  rule = block_rule / compact_rule\n\n  comment_item = ((\"#\" *(!%x0A chr)) as comment) / ((!(keyword) identifier) as noop)\n  rule_line = [ws] (rule / comment_item) [ws]\n  rule_items = *(rule_line)\n  sequence_block = \"sequence\" [ws] \"{\" [ws] (rule_items as sequence) [ws] \"}\"\n  parallel_block = \"parallel\" [ws] \"{\" [ws] (rule_items as parallel) [ws] \"}\"\n\n  separator_part = whitespace \"separator\" whitespace (item_atom as separator)\n  separate_directive = (\"separate\") as separate [(separator_part)]\n  case_directive = ((\"downcase\") / (\"upcase\")) as case\n  case_kwargs_part = whitespace (kwarg_list as case_kwargs)\n  title_case_directive = (\"title_case\") as case [(case_kwargs_part)]\n  string_case_directive = case_directive / title_case_directive\n  compose_directive = ((\"compose\") / (\"decompose\")) as compose\n  kwarg = (identifier as kwarg_name) [ws] \":\" [ws] ((quoted_string) as kwarg_value)\n  kwarg_item = (kwarg) as kwarg\n  kwarg_list = (kwarg_item *(comma_ws kwarg_item))\n  funcall_kwargs_part = whitespace (kwarg_list as funcall_kwargs)\n  rababa_directive = (\"rababa\") as funcall_name [(funcall_kwargs_part)]\n  run_dep = \"map.\" (identifier as dep) \".stage.\" (identifier as stage)\n  run_stage_only = (\"stage.\" (identifier as stage)) as run_stage_only\n  run_rule = \"run\" whitespace ((run_dep) / run_stage_only)\n\n  bare_rule = (rule) as bare_rule\n  stage_item = [ws] (sequence_block / parallel_block / run_rule / separate_directive / string_case_directive / compose_directive / rababa_directive / bare_rule / comment_item) [ws]\n  stage_items = *(stage_item)\n  stage_name_paren = \"(\" (identifier as stage_name) \")\"\n  stage_name_ws = whitespace (identifier as stage_name)\n  stage_block = \"stage\" (stage_name_paren / stage_name_ws) [ws] \"{\" [ws] (stage_items as stage) [ws] \"}\"\n\n  # -- tests ---------------------------------------------------------------\n\n  test_note = whitespace \"note\" whitespace (quoted_string as note)\n  test_line = [whitespace] (quoted_string as input) arrow (quoted_string as expected) [(test_note)] [whitespace]\n  test_items = *(test_line)\n  tests_block = \"tests\" [whitespace] \"{\" [ws] (test_items as tests) [ws] \"}\"\n\n  # -- system --------------------------------------------------------------\n\n  block_item = [whitespace] (metadata_block / aliases_block / tests_block / stage_block / dependency_decl) [whitespace]\n  body_items = *(block_item)\n  system_block = \"system\" whitespace ((quoted_string) as system_code) [whitespace] \"{\" [ws] ((*(block_item)) as body) [ws] \"}\" [whitespace]\n  isc_source = [whitespace] ((system_block) as system) [whitespace]\n\n  entry isc: isc_source\n}\n","checksum":"sha256:ea8e10a7e32e4579989b081c3bf77384a96967e43c56755c57b50470a96350ad"}
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n":{"atom":845,"min":0,"max":1,"tag":"Maybe"}},{"Sequence":{"atoms":[841,842,844,852]}},{"Alternative":{"atoms":[108,320,567,606,840]}},{"Entity":{"atom":25}},{"Repetition":{"atom":855,"min":0,"max":1,"tag":"Maybe"}},{"Sequence":{"atoms":[107,854,856]}},{"Repetition":{"atom":105,"min":0,"max":null,"tag":"Repetition"}},{"Named":{"name":"body","atom":858}},{"Entity":{"atom":103}},{"Repetition":{"atom":860,"min":0,"max":1,"tag":"Maybe"}},{"Str":{"pattern":"}"}},{"Entity":{"atom":25}},{"Repetition":{"atom":863,"min":0,"max":1,"tag":"Maybe"}},{"Sequence":{"atoms":[28,29,95,97,98,104,859,861,862,864]}},{"Named":{"name":"system","atom":27}},{"Entity":{"atom":25}},{"Repetition":{"atom":867,"min":0,"max":1,"tag":"Maybe"}},{"Sequence":{"atoms":[26,866,868]}}],"root":869},"bindings":[]}},"preprocess":{},"tables":{},"lint":{"order_warnings":["rule newline: branches 1 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 2 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 3 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 4 and 30 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 5 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 16 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 6 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 7 and 31 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 12 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 8 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 9 and 29 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 19 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 10 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 14 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 11 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 13 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 12 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 18 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 13 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 14 and 27 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 15 and 33 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 16 and 32 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 17 and 23 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 18 and 21 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 20 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 19 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 22 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 20 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 22 and 34 are order-dependent (shared first bytes; ordered choice is decisive)","rule keyword: branches 24 and 25 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule relation_type: branches 5 and 6 are order-dependent (shared first bytes; ordered choice is decisive)","rule md_field_value: branches 1 and 2 are order-dependent (first set not statically known)","rule item_sep: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule any_arg: branches 1 and 3 are order-dependent (first set not statically known)","rule any_arg: branches 2 and 3 are order-dependent (first set not statically known)","rule cont_stop: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 1 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 2 and 3 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 2 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 3 and 8 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 3 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 4 and 5 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 4 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 5 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 6 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 7 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 8 and 9 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 8 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 9 and 10 are order-dependent (shared first bytes; ordered choice is decisive)","rule item_atom: branches 9 and 11 are order-dependent (first set not statically known)","rule item_atom: branches 10 and 11 are order-dependent (first set not statically known)","rule constraint: branches 3 and 4 are order-dependent (shared first bytes; ordered choice is decisive)","rule rule: branches 1 and 2 are order-dependent (shared first bytes; ordered choice is decisive)","rule comment_item: branches 1 and 2 are order-dependent (first set not statically known)"]},"default_entry":"isc","render":{},"derive":{},"tests":[],"docs":{},"source":"# Interscript ISC grammar — parsanol grammar language (PG).\n#\n# Line-oriented port of lib/interscript/isc/grammar/concerns/*.rb.\n# The capture tree must reproduce the Ruby-DSL parser's tree exactly:\n#   - repetitions are ABNF prefixes (1*x, *x)\n#   - negation is !x, positive lookahead is &x\n#   - captures at use sites (rule_ref as name) nest inner captures\n#     the same way parslet .as does\n#\n# Consumed by the interscript gem (artifact parse) and parsanol npm.\n\ngrammar InterscriptIsc version \"0.1.0\" {\n\n  # -- lexical primitives -------------------------------------------------\n\n  chr = %x00-10FFFF\n  space_char = %x20 / %x09 / %x0A / %x0B / %x0C / %x0D\n  newline = %x0D.0A / %x0A / %x0D\n  line_comment = \"#\" *(!(newline) chr)\n  whitespace = 1*(space_char / line_comment)\n  ws = *(space_char / line_comment)\n  inline_space = 1*(%x20 / %x09)\n  inline_ws = *(inline_space / line_comment)\n  hexd = %x30-39 / %x41-46 / %x61-66\n  digit = %x30-39\n\n  ident_first = %x41-5A / %x61-7A / %x5F\n  ident_rest = %x41-5A / %x61-7A / %x30-39 / %x5F\n  identifier = (ident_first 0*ident_rest) as identifier\n\n  keyword = \"parallel\" / \"sequence\" / \"stage\" / \"compose\" / \"separate\" / \"system\" / \"metadata\" / \"aliases\" / \"tests\" / \"notes\" / \"description\" / \"any_character\" / \"authority\" / \"dependency\" / \"run\" / \"sub\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"any\" / \"none\" / \"boundary\" / \"line_start\" / \"line_end\" / \"word_boundary\" / \"downcase\" / \"upcase\" / \"title_case\" / \"capture\" / \"maybe\" / \"some\" / \"ref\" / \"name\"\n\n  # -- string literals ----------------------------------------------------\n\n  esc_nl = (\"n\") as newline\n  esc_cr = (\"r\") as carriage_return\n  esc_tab = (\"t\") as tab\n  esc_dq = \"\\\"\" as dquote\n  esc_bs = \"\\\\\" as backslash\n  esc_uni4 = \"u\" (4hexd) as unicode\n  esc_uni8 = \"U\" (4*8hexd) as unicode\n  escape_sequence = \"\\\\\" (esc_nl / esc_cr / esc_tab / esc_dq / esc_bs / esc_uni4 / esc_uni8)\n\n  raw_run = 1*(!(\"\\\\\" / \"\\\"\") chr)\n  dq_parts = *(escape_sequence / (raw_run as run))\n  double_quoted = \"\\\"\" (dq_parts as string) \"\\\"\"\n  sq_body = *(!\"'\" chr)\n  single_quoted = \"'\" (sq_body as string) \"'\"\n  quoted_string = double_quoted / single_quoted\n\n  arrow = [whitespace] \"->\" [whitespace]\n  comma_ws = \",\" [whitespace]\n\n  # -- metadata -----------------------------------------------------------\n\n  md_authority = \"authority\" whitespace ((quoted_string) as authority)\n  md_source_spelling = \"source_spelling\" whitespace ((quoted_string) as source_spelling)\n  md_target_spelling = \"target_spelling\" whitespace ((quoted_string) as target_spelling)\n  md_identifying = \"identifying\" whitespace ((quoted_string) as identifying)\n  md_name = \"name\" whitespace ((quoted_string) as name)\n  md_spec_value = quoted_string as specification\n  md_specification = \"specification\" whitespace ((md_spec_value *(comma_ws md_spec_value)) as specification)\n  md_description = \"description\" [whitespace] \"{\" [ws] (raw_text as description) [ws] \"}\"\n  md_system_status = \"system_status\" whitespace ((\"current\" / \"former\" / \"inactive\") as system_status)\n  md_code_status = \"code_status\" whitespace ((\"preferred\" / \"proposed\" / \"deprecated\") as code_status)\n\n  relation_type = \"supersedes\" / \"superseded_by\" / \"based_on\" / \"basis_for\" / \"alias_of\" / \"adopted_from\" / \"related_to\"\n  relation_note = whitespace \"note\" whitespace (quoted_string as note)\n  relation_item = [whitespace] (relation_type as type) whitespace (quoted_string as system) [(relation_note)] [whitespace]\n  md_relations = \"relations\" [whitespace] \"{\" [ws] ((*(relation_item)) as relations) [ws] \"}\"\n\n  note_item = [whitespace] \"note\" [whitespace] (quoted_string as note) [whitespace]\n  md_notes = \"notes\" [whitespace] \"{\" [ws] ((*(note_item)) as notes) [ws] \"}\"\n\n  md_provenance_value = quoted_string as provenance\n  md_provenance = \"provenance\" [whitespace] ((md_provenance_value *(comma_ws md_provenance_value)) as provenance)\n\n  md_empty_field = &(newline)\n  md_raw_field_value = 1*(!%x0A !\"}\" !\"{\" chr)\n  md_field_value = quoted_string / (md_raw_field_value as raw)\n  md_field_block = \"{\" [ws] (raw_text as field_block) [ws] \"}\"\n  md_generic_field = (identifier as field_name) inline_ws ((md_field_value as field_value) / md_field_block / md_empty_field)\n\n  metadata_field = [whitespace] (md_description / md_relations / md_system_status / md_code_status / md_specification / md_notes / md_provenance / md_generic_field) [whitespace]\n  md_items = *(metadata_field)\n  metadata_block = \"metadata\" [whitespace] \"{\" [ws] (md_items as metadata) [ws] \"}\"\n\n  raw_text = *(\"\\\\\" chr / (!\"}\" chr))\n\n  # -- aliases ------------------------------------------------------------\n\n  alias_decl = [whitespace] (identifier as name) [whitespace] \"=\" [whitespace] (item as value) [whitespace]\n  alias_items = *(alias_decl)\n  aliases_block = \"aliases\" [whitespace] \"{\" [ws] (alias_items as aliases) [ws] \"}\"\n\n  # -- dependencies -------------------------------------------------------\n\n  dep_alias = whitespace \"as\" whitespace (identifier as alias)\n  dependency_decl = \"dependency\" whitespace (quoted_string as target) [(dep_alias)]\n\n  # -- item expressions ---------------------------------------------------\n\n  zw_primitive = ((\"boundary\") / (\"line_start\") / (\"line_end\") / (\"word_boundary\") / (\"space\") / (\"non_boundary\")) as primitive\n  fn_lit = ((\"upcase\") / (\"downcase\") / (\"title_case\") / (\"reverse\") / (\"strip\") / (\"swapcase\")) as function\n  any_char_lit = (\"any_character\") as any_char\n  none_lit = (\"none\") as none\n\n  digit_cap = digit as digit\n  capture_reference_body = \"ref\" \"(\" [ws] digit_cap [ws] \")\"\n  capture_reference = capture_reference_body as ref\n\n  item_ref = identifier \".\" (identifier as qualified_name)\n  alias_reference = (!(keyword) identifier [(\".\" (identifier as qualified_name))] !\"{\" ) as alias\n\n  item_seq = item_atom\n  item_sep = ([ws] \"+\" [ws]) / whitespace\n  item_cont = &item_atom\n\n  range_arg = (quoted_string as lo) [ws] \"..\" [ws] (quoted_string as hi)\n  list_item = item\n  list_items = (list_item *((comma_ws / whitespace) list_item))\n  set_arg = ((quoted_string as single)) / (\"[\" [ws] ((list_item *((comma_ws / whitespace) list_item)) as list) [ws] \"]\")\n  alias_arg = (!zw_primitive !(keyword) identifier) as alias_ref\n  any_arg = range_arg / set_arg / alias_arg\n  any_ctor = \"any\" \"(\" [ws] (any_arg as any) [ws] \")\"\n  capture_ctor = \"capture\" \"(\" [ws] (item as capture_inner) [ws] \")\"\n  maybe_ctor = \"maybe\" \"(\" [ws] (item as maybe_inner) [ws] \")\"\n  some_ctor = \"some\" \"(\" [ws] (item as some_inner) [ws] \")\"\n\n  item_atom_start = \"\\\"\" / \"'\" / ident_first\n  cont_stop = \"to\" / \"before\" / \"after\" / \"not_before\" / \"not_after\" / \"}\"\n  alias_decl_stop = identifier [ws] \"=\"\n  item_atom = quoted_string / none_lit / zw_primitive / any_char_lit / any_ctor / capture_ctor / maybe_ctor / some_ctor / fn_lit / capture_reference / alias_reference\n  item = (item_atom 0*(item_sep !cont_stop !(alias_decl_stop) &item_atom_start item_atom)) as concatenation\n\n  # -- rules and stages ---------------------------------------------------\n\n  constraint_after = \"after\" whitespace (item as after)\n  constraint_before = \"before\" whitespace (item as before)\n  constraint_not_before = \"not_before\" whitespace (item as not_before)\n  constraint_not_after = \"not_after\" whitespace (item as not_after)\n  constraint = constraint_after / constraint_before / constraint_not_before / constraint_not_after\n  constraints = *(whitespace constraint)\n\n  compact_rule = \"sub\" whitespace (item_atom as from) whitespace (item_atom as to) ((*(whitespace constraint)) as constraints)\n\n  block_rule = \"sub\" [ws] \"{\" [ws] \"from\" whitespace (item as from) [ws] \"to\" whitespace (item as to) ((*(whitespace constraint)) as constraints) [ws] \"}\"\n\n  rule = block_rule / compact_rule\n\n  comment_item = ((\"#\" *(!%x0A chr)) as comment) / ((!(keyword) identifier) as noop)\n  rule_line = [ws] (rule / comment_item) [ws]\n  rule_items = *(rule_line)\n  sequence_block = \"sequence\" [ws] \"{\" [ws] (rule_items as sequence) [ws] \"}\"\n  parallel_block = \"parallel\" [ws] \"{\" [ws] (rule_items as parallel) [ws] \"}\"\n\n  separator_part = whitespace \"separator\" whitespace (item_atom as separator)\n  separate_directive = (\"separate\") as separate [(separator_part)]\n  case_directive = ((\"downcase\") / (\"upcase\")) as case\n  case_kwargs_part = whitespace (kwarg_list as case_kwargs)\n  title_case_directive = (\"title_case\") as case [(case_kwargs_part)]\n  string_case_directive = case_directive / title_case_directive\n  compose_directive = ((\"compose\") / (\"decompose\")) as compose\n  kwarg = (identifier as kwarg_name) [ws] \":\" [ws] ((quoted_string) as kwarg_value)\n  kwarg_item = (kwarg) as kwarg\n  kwarg_list = (kwarg_item *(comma_ws kwarg_item))\n  funcall_kwargs_part = whitespace (kwarg_list as funcall_kwargs)\n  rababa_directive = (\"rababa\") as funcall_name [(funcall_kwargs_part)]\n  run_dep = \"map.\" (identifier as dep) \".stage.\" (identifier as stage)\n  run_stage_only = (\"stage.\" (identifier as stage)) as run_stage_only\n  run_rule = \"run\" whitespace ((run_dep) / run_stage_only)\n\n  bare_rule = (rule) as bare_rule\n  stage_item = [ws] (sequence_block / parallel_block / run_rule / separate_directive / string_case_directive / compose_directive / rababa_directive / bare_rule / comment_item) [ws]\n  stage_items = *(stage_item)\n  stage_name_paren = \"(\" (identifier as stage_name) \")\"\n  stage_name_ws = whitespace (identifier as stage_name)\n  stage_block = \"stage\" (stage_name_paren / stage_name_ws) [ws] \"{\" [ws] (stage_items as stage) [ws] \"}\"\n\n  # -- tests ---------------------------------------------------------------\n\n  test_note = whitespace \"note\" whitespace (quoted_string as note)\n  test_line = [whitespace] (quoted_string as input) arrow (quoted_string as expected) [(test_note)] [whitespace]\n  test_items = *(test_line)\n  tests_block = \"tests\" [whitespace] \"{\" [ws] (test_items as tests) [ws] \"}\"\n\n  # -- system --------------------------------------------------------------\n\n  block_item = [whitespace] (metadata_block / aliases_block / tests_block / stage_block / dependency_decl) [whitespace]\n  body_items = *(block_item)\n  system_block = \"system\" whitespace ((quoted_string) as system_code) [whitespace] \"{\" [ws] ((*(block_item)) as body) [ws] \"}\" [whitespace]\n  isc_source = [whitespace] ((system_block) as system) [whitespace]\n\n  entry isc: isc_source\n}\n","checksum":"sha256:0ac87603876dc56cd3dccc00781a4a28804ff6a8f39d5898816ebb703cf84fe8"}
diff --git a/lib/interscript/isc/grammar/concerns/primitives.rb b/lib/interscript/isc/grammar/concerns/primitives.rb
index 554cd5d5..57089541 100644
--- a/lib/interscript/isc/grammar/concerns/primitives.rb
+++ b/lib/interscript/isc/grammar/concerns/primitives.rb
@@ -62,7 +62,10 @@ module Primitives
               str('"').as(:dquote) |
               str("\\").as(:backslash) |
               (str("u") >> match(/[0-9a-fA-F]/).repeat(4, 4).as(:unicode)) |
-              (str("U") >> match(/[0-9a-fA-F]/).repeat(8, 8).as(:unicode))
+              # The corpus converter emits \U with 4 hex digits too
+              # (gki-bel "\U040E") — accept 4..8, don't be stricter than
+              # the corpus.
+              (str("U") >> match(/[0-9a-fA-F]/).repeat(4, 8).as(:unicode))
             )
           end
 
diff --git a/lib/interscript/isc/grammar/isc.parg b/lib/interscript/isc/grammar/isc.parg
index 77df2c03..3b4af8dd 100644
--- a/lib/interscript/isc/grammar/isc.parg
+++ b/lib/interscript/isc/grammar/isc.parg
@@ -38,7 +38,7 @@ grammar InterscriptIsc version "0.1.0" {
   esc_dq = "\"" as dquote
   esc_bs = "\\" as backslash
   esc_uni4 = "u" (4hexd) as unicode
-  esc_uni8 = "U" (8hexd) as unicode
+  esc_uni8 = "U" (4*8hexd) as unicode
   escape_sequence = "\\" (esc_nl / esc_cr / esc_tab / esc_dq / esc_bs / esc_uni4 / esc_uni8)
 
   raw_run = 1*(!("\\" / "\"") chr)