1 files changed, 132 insertions, 0 deletions
diff --git a/mini_xdebug.c b/mini_xdebug.c
new file mode 100644
index 0000000..b9263ba
--- /dev/null
+++ b/mini_xdebug.c
@@ -0,0 +1,132 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "php.h"
+#include "zend_extensions.h"
+
+#define MINI_XDEBUG_CMD_END -1
+#define MINI_XDEBUG_CMD_INVALID 0
+#define MINI_XDEBUG_CMD_NEXT 1
+
+static int g_is_first_statement;
+static int g_do_next_cmd;
+static int g_next_call_depth;
+
+static void mini_xdebug_activate(void) {
+    CG(compiler_options) |= ZEND_COMPILE_EXTENDED_STMT;
+    g_is_first_statement = 1;
+    g_do_next_cmd = 0;
+    g_next_call_depth = 0;
+}
+
+static int get_call_depth(void) {
+    int depth = 0;
+    zend_execute_data* ex = EG(current_execute_data);
+    while (ex) {
+        depth++;
+        ex = ex->prev_execute_data;
+    }
+    return depth;
+}
+
+static void show_context(const char* filename, int lineno) {
+    FILE* fp = fopen(filename, "r");
+    if (!fp) {
+        return;
+    }
+
+    char buf[1024];
+    int n = 0;
+    while (fgets(buf, sizeof(buf), fp)) {
+        n++;
+        if (lineno - 1 <= n && n <= lineno + 1) {
+            fprintf(stdout, "%s %3d | %s", n == lineno ? ">" : " ", n, buf);
+        }
+        if (n > lineno + 1) {
+            break;
+        }
+    }
+    fclose(fp);
+}
+
+static void show_prompt(void) {
+    fprintf(stdout, "(mini-xdebug) ");
+    fflush(stdout);
+}
+
+static int query_command(char* buf) {
+    if (!fgets(buf, sizeof(buf), stdin)) {
+        return MINI_XDEBUG_CMD_END;
+    }
+    buf[strcspn(buf, "\n")] = '\0';
+
+    return (!strcmp(buf, "next") || !strcmp(buf, "n"))
+               ? MINI_XDEBUG_CMD_NEXT
+               : MINI_XDEBUG_CMD_INVALID;
+}
+
+static void mini_xdebug_statement_handler(zend_execute_data* frame) {
+    if (!g_is_first_statement && !g_do_next_cmd) {
+        return;
+    }
+
+    uint32_t lineno = EG(current_execute_data)->opline->lineno;
+    const char* filename = ZSTR_VAL(frame->func->op_array.filename);
+    int depth = get_call_depth();
+
+    if (g_is_first_statement) {
+        g_is_first_statement = 0;
+    } else if (g_do_next_cmd) {
+        if (depth > g_next_call_depth) {
+            return;
+        }
+        g_do_next_cmd = 0;
+    }
+
+    fprintf(stdout, "\n%s:%d\n", filename, lineno);
+    show_context(filename, lineno);
+
+    char command_buf[256];
+    for (;;) {
+        show_prompt();
+        int cmd = query_command(command_buf);
+        if (cmd == MINI_XDEBUG_CMD_NEXT) {
+            g_do_next_cmd = 1;
+            g_next_call_depth = depth;
+            break;
+        } else if (cmd == MINI_XDEBUG_CMD_END) {
+            break;
+        } else {
+            fprintf(stdout, "Available commands: next (n)\n");
+        }
+    }
+}
+
+#ifndef ZEND_EXT_API
+#define ZEND_EXT_API ZEND_DLEXPORT
+#endif
+
+ZEND_EXT_API zend_extension_version_info extension_version_info = {
+    ZEND_EXTENSION_API_NO,
+    (char*)ZEND_EXTENSION_BUILD_ID,
+};
+
+ZEND_DLEXPORT zend_extension zend_extension_entry = {
+    "mini-xdebug",                 /* name */
+    "0.1.0",                       /* version */
+    "nsfisis",                     /* author */
+    "",                            /* URL */
+    "",                            /* copyright */
+    NULL,                          /* startup */
+    NULL,                          /* shutdown */
+    mini_xdebug_activate,          /* activate */
+    NULL,                          /* deactivate */
+    NULL,                          /* message_handler */
+    NULL,                          /* op_array_handler */
+    mini_xdebug_statement_handler, /* statement_handler */
+    NULL,                          /* fcall_begin_handler */
+    NULL,                          /* fcall_end_handler */
+    NULL,                          /* op_array_ctor */
+    NULL,                          /* op_array_dtor */
+    STANDARD_ZEND_EXTENSION_PROPERTIES,
+};