From da94f2bc8ceadcec014d8e5b4819f96ab34fecfb Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Mon, 31 Mar 2025 02:17:47 -0400
Subject: Move pattern code into patterns file

---
 src/stdlib/patterns.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/stdlib/patterns.c')

diff --git a/src/stdlib/patterns.c b/src/stdlib/patterns.c
index 07a17afb..e274cba9 100644
--- a/src/stdlib/patterns.c
+++ b/src/stdlib/patterns.c
@@ -1251,6 +1251,26 @@ public Closure_t Text$by_split(Text_t text, Pattern_t pattern)
     };
 }
 
+public Pattern_t Pattern$escape_text(Text_t text)
+{
+    // TODO: optimize for spans of non-escaped text
+    Text_t ret = EMPTY_TEXT;
+    TextIter_t state = NEW_TEXT_ITER_STATE(text);
+    for (int64_t i = 0; i < text.length; i++) {
+        uint32_t g = Text$get_main_grapheme_fast(&state, i);
+        if (g == '{') {
+            ret = Text$concat(ret, Text("{1{}"));
+        } else if (g == '?'
+                   || uc_is_property_quotation_mark(g)
+                   || (uc_is_property_paired_punctuation(g) && uc_is_property_left_of_pair(g))) {
+            ret = Text$concat(ret, Text("{1"), Text$slice(text, I(i+1), I(i+1)), Text("}"));
+        } else {
+            ret = Text$concat(ret, Text$slice(text, I(i+1), I(i+1)));
+        }
+    }
+    return ret;
+}
+
 public const TypeInfo_t Pattern$info = {
     .size=sizeof(Pattern_t),
     .align=__alignof__(Pattern_t),
-- 
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