Moved json code into its own file

1 files changed, 44 insertions, 0 deletions

diff --git a/json.c b/json.c
new file mode 100644
index 0000000..d45e79c
--- /dev/null
+++ b/json.c
@@ -0,0 +1,44 @@
+/*
+ * json.c - Code for printing JSON output of matches.
+ */
+#include "types.h"
+
+/*
+ * Print a match as JSON
+ */
+static int _json_match(FILE *f, const char *text, match_t *m, int comma, int verbose)
+{
+    if (!verbose) {
+        if (m->op->op != VM_REF) {
+            for (match_t *child = m->child; child; child = child->nextsibling) {
+                comma |= _json_match(f, text, child, comma, verbose);
+            }
+            return comma;
+        }
+    }
+
+    if (comma) fprintf(f, ",\n");
+    comma = 0;
+    fprintf(f, "{\"rule\":\"");
+    for (const char *c = m->op->start; c < m->op->end; c++) {
+        switch (*c) {
+            case '"': fprintf(f, "\\\""); break;
+            case '\\': fprintf(f, "\\\\"); break;
+            case '\t': fprintf(f, "\\t"); break;
+            case '\n': fprintf(f, "↵"); break;
+            default: fprintf(f, "%c", *c); break;
+        }
+    }
+    fprintf(f, "\",\"start\":%ld,\"end\":%ld,\"children\":[",
+            m->start - text, m->end - text);
+    for (match_t *child = m->child; child; child = child->nextsibling) {
+        comma |= _json_match(f, text, child, comma, verbose);
+    }
+    fprintf(f, "]}");
+    return 1;
+}
+
+void json_match(FILE *f, const char *text, match_t *m, int verbose)
+{
+    _json_match(f, text, m, 0, verbose);
+}