From 2bb0250be8297cc950d0036915ecdf61ab6f3700 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 31 Jul 2021 16:43:50 -0400
Subject: Factor out and expose prefixed name predicates

Towards using these in the writer to escape names more precisely.
---
 src/n3.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

(limited to 'src/n3.c')

diff --git a/src/n3.c b/src/n3.c
index 79a48a93..08c7754d 100644
--- a/src/n3.c
+++ b/src/n3.c
@@ -19,11 +19,13 @@
 #include "env.h"
 #include "namespaces.h"
 #include "node.h"
+#include "ntriples.h"
 #include "read_ntriples.h"
 #include "reader.h"
 #include "stack.h"
 #include "string_utils.h"
 #include "try.h"
+#include "turtle.h"
 
 #include "serd/serd.h"
 
@@ -185,33 +187,10 @@ read_PN_LOCAL_ESC(SerdReader* const reader, SerdNode* const dest)
   eat_byte_safe(reader, '\\');
 
   const int c = peek_byte(reader);
-  switch (c) {
-  case '!':
-  case '#':
-  case '$':
-  case '%':
-  case '&':
-  case '\'':
-  case '(':
-  case ')':
-  case '*':
-  case '+':
-  case ',':
-  case '-':
-  case '.':
-  case '/':
-  case ';':
-  case '=':
-  case '?':
-  case '@':
-  case '_':
-  case '~':
-    return push_byte(reader, dest, eat_byte_safe(reader, c));
-  default:
-    break;
-  }
 
-  return r_err(reader, SERD_ERR_BAD_SYNTAX, "invalid escape");
+  return is_PN_LOCAL_ESC(c)
+           ? push_byte(reader, dest, eat_byte_safe(reader, c))
+           : r_err(reader, SERD_ERR_BAD_SYNTAX, "invalid escape");
 }
 
 static SerdStatus
@@ -611,7 +590,7 @@ read_verb(SerdReader* reader, SerdNode** dest)
   SerdNode* node    = *dest;
   const int next    = peek_byte(reader);
   if (node->length == 1 && serd_node_string(node)[0] == 'a' && next != ':' &&
-      !is_PN_CHARS_BASE((uint32_t)next)) {
+      !is_PN_CHARS_BASE(next)) {
     serd_stack_pop_to(&reader->stack, orig_stack_size);
     return ((*dest = push_node(reader, SERD_URI, NS_RDF "type", 47))
               ? SERD_SUCCESS
-- 
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