initial release

Signed-off-by: Anna (navi) Figueiredo Gomes <navi@vlhl.dev>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/literal.c b/src/literal.c
new file mode 100644
index 0000000..8723462
--- /dev/null
+++ b/src/literal.c
@@ -0,0 +1,58 @@
+#include <ctype.h>
+#include <string.h>
+#include <json.h>
+#include "internal.h"
+
+enum json_parse_result parse_literal(struct json **json_out, struct raw_json *raw) {
+	enum json_parse_result ret = JSON_PARSE_OK;
+	struct json *json = NULL;
+
+	bool plus_one = raw->data[raw->index] == '+' || raw->data[raw->index] == '-';
+	if (plus_one || isdigit(raw->data[raw->index])) {
+		if (raw->data[raw->index] == '0' && isdigit(raw->data[raw->index + 1])) {
+			ret = JSON_PARSE_INVALID_NUMBER_ERR;
+			goto err;
+		}
+		const char *start = raw->data + raw->index + plus_one;
+		char *end;
+		/* is probably a number here, strtodl will tell */
+		double num = strtod(start, &end);
+		if (end != start) {
+			if (raw->data[raw->index] == '-')
+				num = -num;
+			json = json_new_number(num);
+			raw->index = end - raw->data;
+		} else {
+			ret = JSON_PARSE_INVALID_NUMBER_ERR;
+			goto err;
+		}
+	} else {
+		size_t end_index;
+		for (end_index = raw->index; end_index < raw->size; end_index++) {
+			if (!isalpha(raw->data[end_index])) {
+				break;
+			}
+		}
+		size_t len = end_index - raw->index;
+		if (len == 4 && strncmp(raw->data + raw->index, "true", len) == 0) {
+			json = json_new_bool(true);
+		} else if (len == 5 && strncmp(raw->data + raw->index, "false", len) == 0) {
+			json = json_new_bool(false);
+		} else if (len == 4 && strncmp(raw->data + raw->index, "null", len) == 0) {
+			json = json_new_null();
+		} else {
+			ret = JSON_PARSE_INVALID_TOKEN_ERR;
+		}
+		raw->index = end_index;
+	}
+
+	if (!json)
+		return JSON_OOM;
+
+	*json_out = json;
+	goto end;
+err:
+	json_delete(json);
+end:
+	return ret;
+}