From 8e478e06c2c09e8d74fcaa6cca84f7db14d23265 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Sun, 24 Aug 2025 22:53:21 +0200
Subject: improved testing & src cleanup

---
 src/json.c    | 23 +++++++++++++++--------
 src/testing.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 8 deletions(-)
 create mode 100644 src/testing.c

(limited to 'src')

diff --git a/src/json.c b/src/json.c
index 8531d48..d3f510f 100644
--- a/src/json.c
+++ b/src/json.c
@@ -186,22 +186,29 @@ parse_result parse_string(byte *src, uptr start_pos, uptr max_pos) {
     result.pos = start_pos + 1;
 
     // SIMD optimization: process 32 bytes at a time using AVX2
-    bytex32 quote_mask = _mm256_set1_epi8('"');
+    bytex32 quote_bytes = _mm256_set1_epi8('"');
 
     for (; result.pos + 32 <= max_pos; result.pos += 32) {
         bytex32 chunk = _mm256_loadu_si256((bytex32 *)(src + result.pos));
-        bytex32 cmp = _mm256_cmpeq_epi8(chunk, quote_mask);
-        i32 mask = _mm256_movemask_epi8(cmp);
+        i32 quote_mask =
+            _mm256_movemask_epi8(_mm256_cmpeq_epi8(chunk, quote_bytes));
 
-        if (mask != 0) {
-            result.pos += stdc_trailing_zeros_ui(mask);
-            if (src[result.pos - 1] != '\\') break;
+        if (quote_mask != 0) {
+            result.pos += stdc_trailing_zeros_ui(quote_mask);
+            break;
         };
     }
 
     // Fall back to original byte-by-byte processing for the remaining bytes
-    while (src[result.pos] != '"' && src[result.pos - 1] != '\\') {
-        result.pos++;
+    for (; result.pos < max_pos; result.pos++) {
+        if (src[result.pos] == '"') {
+            uptr backslash_count = 0;
+            while (backslash_count < result.pos &&
+                   src[result.pos - backslash_count - 1] == '\\') {
+                backslash_count++;
+            }
+            if (!(backslash_count & 1)) break;
+        }
     }
 
     assert_parse(src[result.pos] == '"', "invalid string end", src, result.pos);
diff --git a/src/testing.c b/src/testing.c
new file mode 100644
index 0000000..937d2dc
--- /dev/null
+++ b/src/testing.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+#include "../include/assert.h"
+#include "../include/memory.h"
+#include "../include/str.h"
+#include "../include/testing.h"
+#include "../include/types.h"
+
+MemoryFile load_file(Arena *a, const char *filename) {
+    FILE *file = fopen(filename, "rb");
+    assert(file != 0, "failed to open file: %s", filename);
+    MemoryFile mem_file = {0};
+
+    // Get file size
+    fseek(file, 0, SEEK_END);
+    mem_file.size = ftell(file);
+    fseek(file, 0, SEEK_SET);
+
+    mem_file.content = new(a, byte, mem_file.size + 1);
+
+    size bytes_read = fread(mem_file.content, 1, mem_file.size, file);
+    assert(bytes_read == mem_file.size, "failed to read entire file: %s",
+           filename);
+
+    mem_file.content[mem_file.size] = '\0'; // Null terminate
+    fclose(file);
+    return mem_file;
+}
-- 
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