Support for 'alias' + test. Improved formatting and '.gitignore'.

5 files changed, 749 insertions, 614 deletions

diff --git a/src/lsp/json_rpc.c b/src/lsp/json_rpc.c
index c75af95..903da71 100644
--- a/src/lsp/json_rpc.c
+++ b/src/lsp/json_rpc.c
@@ -5,81 +5,107 @@
 #include <string.h>
 
 // Basic JSON parsing helpers
-char *get_json_string(const char *json, const char *key) {
-  char search[256];
-  sprintf(search, "\"%s\":\"", key);
-  char *p = strstr(json, search);
-  if (!p) {
-    return NULL;
-  }
-  p += strlen(search);
-  char *end = strchr(p, '"');
-  if (!end) {
-    return NULL;
-  }
-  int len = end - p;
-  char *res = malloc(len + 1);
-  strncpy(res, p, len);
-  res[len] = 0;
-  return res;
+char *get_json_string(const char *json, const char *key)
+{
+    char search[256];
+    sprintf(search, "\"%s\":\"", key);
+    char *p = strstr(json, search);
+    if (!p)
+    {
+        return NULL;
+    }
+    p += strlen(search);
+    char *end = strchr(p, '"');
+    if (!end)
+    {
+        return NULL;
+    }
+    int len = end - p;
+    char *res = malloc(len + 1);
+    strncpy(res, p, len);
+    res[len] = 0;
+    return res;
 }
 
 // Extract nested "text" from params/contentChanges/0/text or
 // params/textDocument/text This is very hacky for MVP. proper JSON library
 // needed.
 
-char *get_text_content(const char *json) {
-  char *p = strstr(json, "\"text\":\"");
-  if (!p) {
-    return NULL;
-  }
-  p += 8;
-
-  size_t cap = strlen(p);
-  char *res = malloc(cap + 1);
-  char *dst = res;
-
-  while (*p) {
-    if (*p == '\\') {
-      p++;
-      if (*p == 'n') {
-        *dst++ = '\n';
-      } else if (*p == 'r') {
-        *dst++ = '\r';
-      } else if (*p == 't') {
-        *dst++ = '\t';
-      } else if (*p == '"') {
-        *dst++ = '"';
-      } else if (*p == '\\') {
-        *dst++ = '\\';
-      } else {
-        *dst++ = *p; // preserve others
-      }
-      p++;
-    } else if (*p == '"') {
-      break; // End of string.
-    } else {
-      *dst++ = *p++;
+char *get_text_content(const char *json)
+{
+    char *p = strstr(json, "\"text\":\"");
+    if (!p)
+    {
+        return NULL;
+    }
+    p += 8;
+
+    size_t cap = strlen(p);
+    char *res = malloc(cap + 1);
+    char *dst = res;
+
+    while (*p)
+    {
+        if (*p == '\\')
+        {
+            p++;
+            if (*p == 'n')
+            {
+                *dst++ = '\n';
+            }
+            else if (*p == 'r')
+            {
+                *dst++ = '\r';
+            }
+            else if (*p == 't')
+            {
+                *dst++ = '\t';
+            }
+            else if (*p == '"')
+            {
+                *dst++ = '"';
+            }
+            else if (*p == '\\')
+            {
+                *dst++ = '\\';
+            }
+            else
+            {
+                *dst++ = *p; // preserve others
+            }
+            p++;
+        }
+        else if (*p == '"')
+        {
+            break; // End of string.
+        }
+        else
+        {
+            *dst++ = *p++;
+        }
     }
-  }
-  *dst = 0;
-  return res;
+    *dst = 0;
+    return res;
 }
 
 // Helper to get line/char
-void get_json_position(const char *json, int *line, int *col) {
-  char *pos = strstr(json, "\"position\":");
-  if (!pos) {
-    return;
-  }
-  char *l = strstr(pos, "\"line\":");
-  if (l) {
-    *line = atoi(l + 7);
-  }
-  char *c = strstr(pos, "\"character\":");
-  if (c) {
-    *col = atoi(c + 12);
-  }
+void get_json_position(const char *json, int *line, int *col)
+{
+    char *pos = strstr(json, "\"position\":");
+    if (!pos)
+    {
+        return;
+    }
+    char *l = strstr(pos, "\"line\":");
+    if (l)
+    {
+        *line = atoi(l + 7);
+    }
+    char *c = strstr(pos, "\"character\":");
+    if (c)
+    {
+        *col = atoi(c + 12);
+    }
 }
 
 void lsp_check_file(const char *uri, const char *src);
@@ -87,71 +113,82 @@ void lsp_goto_definition(const char *uri, int line, int col);
 void lsp_hover(const char *uri, int line, int col);
 void lsp_completion(const char *uri, int line, int col);
 
-void handle_request(const char *json_str) {
-  if (strstr(json_str, "\"method\":\"initialize\"")) {
-    const char *response = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{"
-                           "\"capabilities\":{\"textDocumentSync\":1,"
-                           "\"definitionProvider\":true,\"hoverProvider\":true,"
-                           "\"completionProvider\":{"
-                           "\"triggerCharacters\":[\".\"]}}}}";
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(response),
-            response);
-    fflush(stdout);
-    return;
-  }
-
-  if (strstr(json_str, "\"method\":\"textDocument/didOpen\"") ||
-      strstr(json_str, "\"method\":\"textDocument/didChange\"")) {
-
-    char *uri = get_json_string(json_str, "uri");
-    char *text = get_text_content(json_str);
-
-    if (uri && text) {
-      fprintf(stderr, "zls: Checking %s\n", uri);
-      lsp_check_file(uri, text);
+void handle_request(const char *json_str)
+{
+    if (strstr(json_str, "\"method\":\"initialize\""))
+    {
+        const char *response = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{"
+                               "\"capabilities\":{\"textDocumentSync\":1,"
+                               "\"definitionProvider\":true,\"hoverProvider\":true,"
+                               "\"completionProvider\":{"
+                               "\"triggerCharacters\":[\".\"]}}}}";
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(response), response);
+        fflush(stdout);
+        return;
     }
 
-    if (uri) {
-      free(uri);
-    }
-    if (text) {
-      free(text);
+    if (strstr(json_str, "\"method\":\"textDocument/didOpen\"") ||
+        strstr(json_str, "\"method\":\"textDocument/didChange\""))
+    {
+
+        char *uri = get_json_string(json_str, "uri");
+        char *text = get_text_content(json_str);
+
+        if (uri && text)
+        {
+            fprintf(stderr, "zls: Checking %s\n", uri);
+            lsp_check_file(uri, text);
+        }
+
+        if (uri)
+        {
+            free(uri);
+        }
+        if (text)
+        {
+            free(text);
+        }
     }
-  }
-
-  if (strstr(json_str, "\"method\":\"textDocument/definition\"")) {
-    char *uri = get_json_string(json_str, "uri");
-    int line = 0, col = 0;
-    get_json_position(json_str, &line, &col);
 
-    if (uri) {
-      fprintf(stderr, "zls: Definition request at %d:%d\n", line, col);
-      lsp_goto_definition(uri, line, col);
-      free(uri);
+    if (strstr(json_str, "\"method\":\"textDocument/definition\""))
+    {
+        char *uri = get_json_string(json_str, "uri");
+        int line = 0, col = 0;
+        get_json_position(json_str, &line, &col);
+
+        if (uri)
+        {
+            fprintf(stderr, "zls: Definition request at %d:%d\n", line, col);
+            lsp_goto_definition(uri, line, col);
+            free(uri);
+        }
     }
-  }
 
-  if (strstr(json_str, "\"method\":\"textDocument/hover\"")) {
-    char *uri = get_json_string(json_str, "uri");
-    int line = 0, col = 0;
-    get_json_position(json_str, &line, &col);
-
-    if (uri) {
-      fprintf(stderr, "zls: Hover request at %d:%d\n", line, col);
-      lsp_hover(uri, line, col);
-      free(uri);
+    if (strstr(json_str, "\"method\":\"textDocument/hover\""))
+    {
+        char *uri = get_json_string(json_str, "uri");
+        int line = 0, col = 0;
+        get_json_position(json_str, &line, &col);
+
+        if (uri)
+        {
+            fprintf(stderr, "zls: Hover request at %d:%d\n", line, col);
+            lsp_hover(uri, line, col);
+            free(uri);
+        }
     }
-  }
-
-  if (strstr(json_str, "\"method\":\"textDocument/completion\"")) {
-    char *uri = get_json_string(json_str, "uri");
-    int line = 0, col = 0;
-    get_json_position(json_str, &line, &col);
 
-    if (uri) {
-      fprintf(stderr, "zls: Completion request at %d:%d\n", line, col);
-      lsp_completion(uri, line, col);
-      free(uri);
+    if (strstr(json_str, "\"method\":\"textDocument/completion\""))
+    {
+        char *uri = get_json_string(json_str, "uri");
+        int line = 0, col = 0;
+        get_json_position(json_str, &line, &col);
+
+        if (uri)
+        {
+            fprintf(stderr, "zls: Completion request at %d:%d\n", line, col);
+            lsp_completion(uri, line, col);
+            free(uri);
+        }
     }
-  }
 }
diff --git a/src/lsp/lsp_analysis.c b/src/lsp/lsp_analysis.c
index 73ba2c5..d455894 100644
--- a/src/lsp/lsp_analysis.c
+++ b/src/lsp/lsp_analysis.c
@@ -9,335 +9,387 @@
 
 static LSPIndex *g_index = NULL;
 
-typedef struct Diagnostic {
-  int line;
-  int col;
-  char *message;
-  struct Diagnostic *next;
+typedef struct Diagnostic
+{
+    int line;
+    int col;
+    char *message;
+    struct Diagnostic *next;
 } Diagnostic;
 
-typedef struct {
-  Diagnostic *head;
-  Diagnostic *tail;
+typedef struct
+{
+    Diagnostic *head;
+    Diagnostic *tail;
 } DiagnosticList;
 
 static ParserContext *g_ctx = NULL;
 static char *g_last_src = NULL;
 
 // Callback for parser errors.
-void lsp_on_error(void *data, Token t, const char *msg) {
-  DiagnosticList *list = (DiagnosticList *)data;
-  Diagnostic *d = xmalloc(sizeof(Diagnostic));
-  d->line = t.line > 0 ? t.line - 1 : 0;
-  d->col = t.col > 0 ? t.col - 1 : 0;
-  d->message = xstrdup(msg);
-  d->next = NULL;
-
-  if (!list->head) {
-    list->head = d;
-    list->tail = d;
-  } else {
-    list->tail->next = d;
-    list->tail = d;
-  }
+void lsp_on_error(void *data, Token t, const char *msg)
+{
+    DiagnosticList *list = (DiagnosticList *)data;
+    Diagnostic *d = xmalloc(sizeof(Diagnostic));
+    d->line = t.line > 0 ? t.line - 1 : 0;
+    d->col = t.col > 0 ? t.col - 1 : 0;
+    d->message = xstrdup(msg);
+    d->next = NULL;
+
+    if (!list->head)
+    {
+        list->head = d;
+        list->tail = d;
+    }
+    else
+    {
+        list->tail->next = d;
+        list->tail = d;
+    }
 }
 
-void lsp_check_file(const char *uri, const char *json_src) {
-  // Prepare ParserContext (persistent).
-  if (g_ctx) {
-
-    free(g_ctx);
-  }
-  g_ctx = calloc(1, sizeof(ParserContext));
-  g_ctx->is_fault_tolerant = 1;
-
-  DiagnosticList diagnostics = {0};
-  g_ctx->error_callback_data = &diagnostics;
-  g_ctx->on_error = lsp_on_error;
+void lsp_check_file(const char *uri, const char *json_src)
+{
+    // Prepare ParserContext (persistent).
+    if (g_ctx)
+    {
 
-  // Prepare Lexer.
-  // Cache source.
-  if (g_last_src) {
-    free(g_last_src);
-  }
-  g_last_src = strdup(json_src);
-
-  Lexer l;
-  lexer_init(&l, json_src);
-
-  ASTNode *root = parse_program(g_ctx, &l);
+        free(g_ctx);
+    }
+    g_ctx = calloc(1, sizeof(ParserContext));
+    g_ctx->is_fault_tolerant = 1;
+
+    DiagnosticList diagnostics = {0};
+    g_ctx->error_callback_data = &diagnostics;
+    g_ctx->on_error = lsp_on_error;
+
+    // Prepare Lexer.
+    // Cache source.
+    if (g_last_src)
+    {
+        free(g_last_src);
+    }
+    g_last_src = strdup(json_src);
 
-  if (g_index) {
-    lsp_index_free(g_index);
-  }
-  g_index = lsp_index_new();
-  if (root) {
-    lsp_build_index(g_index, root);
-  }
+    Lexer l;
+    lexer_init(&l, json_src);
 
-  // Construct JSON Response (notification)
+    ASTNode *root = parse_program(g_ctx, &l);
 
-  char *notification = malloc(128 * 1024);
-  char *p = notification;
-  p += sprintf(
-      p,
-      "{\"jsonrpc\":\"2.0\",\"method\":\"textDocument/"
-      "publishDiagnostics\",\"params\":{\"uri\":\"%s\",\"diagnostics\":[",
-      uri);
+    if (g_index)
+    {
+        lsp_index_free(g_index);
+    }
+    g_index = lsp_index_new();
+    if (root)
+    {
+        lsp_build_index(g_index, root);
+    }
 
-  Diagnostic *d = diagnostics.head;
-  while (d) {
+    // Construct JSON Response (notification)
 
+    char *notification = malloc(128 * 1024);
+    char *p = notification;
     p += sprintf(p,
-                 "{\"range\":{\"start\":{\"line\":%d,\"character\":%d},\"end\":"
-                 "{\"line\":%d,"
-                 "\"character\":%d}},\"severity\":1,\"message\":\"%s\"}",
-                 d->line, d->col, d->line, d->col + 1, d->message);
+                 "{\"jsonrpc\":\"2.0\",\"method\":\"textDocument/"
+                 "publishDiagnostics\",\"params\":{\"uri\":\"%s\",\"diagnostics\":[",
+                 uri);
+
+    Diagnostic *d = diagnostics.head;
+    while (d)
+    {
+
+        p += sprintf(p,
+                     "{\"range\":{\"start\":{\"line\":%d,\"character\":%d},\"end\":"
+                     "{\"line\":%d,"
+                     "\"character\":%d}},\"severity\":1,\"message\":\"%s\"}",
+                     d->line, d->col, d->line, d->col + 1, d->message);
+
+        if (d->next)
+        {
+            p += sprintf(p, ",");
+        }
 
-    if (d->next) {
-      p += sprintf(p, ",");
+        d = d->next;
     }
 
-    d = d->next;
-  }
-
-  p += sprintf(p, "]}}");
+    p += sprintf(p, "]}}");
 
-  // Send notification.
-  long len = strlen(notification);
-  fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", len, notification);
-  fflush(stdout);
+    // Send notification.
+    long len = strlen(notification);
+    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", len, notification);
+    fflush(stdout);
 
-  free(notification);
+    free(notification);
 
-  // Cleanup.
-  Diagnostic *cur = diagnostics.head;
-  while (cur) {
-    Diagnostic *next = cur->next;
-    free(cur->message);
-    free(cur);
-    cur = next;
-  }
+    // Cleanup.
+    Diagnostic *cur = diagnostics.head;
+    while (cur)
+    {
+        Diagnostic *next = cur->next;
+        free(cur->message);
+        free(cur);
+        cur = next;
+    }
 }
 
-void lsp_goto_definition(const char *uri, int line, int col) {
-  if (!g_index) {
-    return;
-  }
-
-  LSPRange *r = lsp_find_at(g_index, line, col);
-  if (r && r->type == RANGE_REFERENCE) {
-    // Found reference, return definition
-    char resp[1024];
-    sprintf(resp,
-            "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"uri\":\"%s\","
-            "\"range\":{\"start\":{"
-            "\"line\":%d,\"character\":%d},\"end\":{\"line\":%d,\"character\":%"
-            "d}}}}",
-            uri, r->def_line, r->def_col, r->def_line, r->def_col);
-
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(resp), resp);
-    fflush(stdout);
-  } else if (r && r->type == RANGE_DEFINITION) {
-    // Already at definition? Return itself.
-    char resp[1024];
-    sprintf(resp,
-            "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"uri\":\"%s\","
-            "\"range\":{\"start\":{"
-            "\"line\":%d,\"character\":%d},\"end\":{\"line\":%d,\"character\":%"
-            "d}}}}",
-            uri, r->start_line, r->start_col, r->end_line, r->end_col);
-
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(resp), resp);
-    fflush(stdout);
-  } else {
-    // Null result
-    const char *null_resp = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":null}";
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(null_resp),
-            null_resp);
-    fflush(stdout);
-  }
+void lsp_goto_definition(const char *uri, int line, int col)
+{
+    if (!g_index)
+    {
+        return;
+    }
+
+    LSPRange *r = lsp_find_at(g_index, line, col);
+    if (r && r->type == RANGE_REFERENCE)
+    {
+        // Found reference, return definition
+        char resp[1024];
+        sprintf(resp,
+                "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"uri\":\"%s\","
+                "\"range\":{\"start\":{"
+                "\"line\":%d,\"character\":%d},\"end\":{\"line\":%d,\"character\":%"
+                "d}}}}",
+                uri, r->def_line, r->def_col, r->def_line, r->def_col);
+
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(resp), resp);
+        fflush(stdout);
+    }
+    else if (r && r->type == RANGE_DEFINITION)
+    {
+        // Already at definition? Return itself.
+        char resp[1024];
+        sprintf(resp,
+                "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"uri\":\"%s\","
+                "\"range\":{\"start\":{"
+                "\"line\":%d,\"character\":%d},\"end\":{\"line\":%d,\"character\":%"
+                "d}}}}",
+                uri, r->start_line, r->start_col, r->end_line, r->end_col);
+
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(resp), resp);
+        fflush(stdout);
+    }
+    else
+    {
+        // Null result
+        const char *null_resp = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":null}";
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(null_resp), null_resp);
+        fflush(stdout);
+    }
 }
 
-void lsp_hover(const char *uri, int line, int col) {
-  (void)uri;
-  if (!g_index) {
-    return;
-  }
-
-  LSPRange *r = lsp_find_at(g_index, line, col);
-  char *text = NULL;
-
-  if (r) {
-    if (r->type == RANGE_DEFINITION) {
-      text = r->hover_text;
-    } else if (r->type == RANGE_REFERENCE) {
-      LSPRange *def = lsp_find_at(g_index, r->def_line, r->def_col);
-      if (def && def->type == RANGE_DEFINITION) {
-        text = def->hover_text;
-      }
+void lsp_hover(const char *uri, int line, int col)
+{
+    (void)uri;
+    if (!g_index)
+    {
+        return;
     }
-  }
 
-  if (text) {
-    char *json = malloc(16384);
-    // content: { kind: markdown, value: text }
-    sprintf(json,
-            "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"contents\":{\"kind\":"
-            "\"markdown\","
-            "\"value\":\"```c\\n%s\\n```\"}}}",
-            text);
+    LSPRange *r = lsp_find_at(g_index, line, col);
+    char *text = NULL;
 
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(json), json);
-    fflush(stdout);
-    free(json);
-  } else {
-    const char *null_resp = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":null}";
-    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(null_resp),
-            null_resp);
-    fflush(stdout);
-  }
+    if (r)
+    {
+        if (r->type == RANGE_DEFINITION)
+        {
+            text = r->hover_text;
+        }
+        else if (r->type == RANGE_REFERENCE)
+        {
+            LSPRange *def = lsp_find_at(g_index, r->def_line, r->def_col);
+            if (def && def->type == RANGE_DEFINITION)
+            {
+                text = def->hover_text;
+            }
+        }
+    }
+
+    if (text)
+    {
+        char *json = malloc(16384);
+        // content: { kind: markdown, value: text }
+        sprintf(json,
+                "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"contents\":{\"kind\":"
+                "\"markdown\","
+                "\"value\":\"```c\\n%s\\n```\"}}}",
+                text);
+
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(json), json);
+        fflush(stdout);
+        free(json);
+    }
+    else
+    {
+        const char *null_resp = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":null}";
+        fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(null_resp), null_resp);
+        fflush(stdout);
+    }
 }
 
-void lsp_completion(const char *uri, int line, int col) {
-  (void)uri;
-  if (!g_ctx) {
-    return;
-  }
-
-  // Context-aware completion (Dot access)
-  if (g_last_src) {
-    // Simple line access
-    int cur_line = 0;
-
-    char *ptr = g_last_src;
-    // Fast forward to line
-    while (*ptr && cur_line < line) {
-      if (*ptr == '\n') {
-        cur_line++;
-      }
-      ptr++;
+void lsp_completion(const char *uri, int line, int col)
+{
+    (void)uri;
+    if (!g_ctx)
+    {
+        return;
     }
 
-    if (col > 0 && ptr[col - 1] == '.') {
-      // Found dot!
-      // Scan backwards for identifier: [whitespace] [ident] .
-      int i = col - 2;
-      while (i >= 0 && (ptr[i] == ' ' || ptr[i] == '\t')) {
-        i--;
-      }
-
-      if (i >= 0) {
-        int end_ident = i;
-        while (i >= 0 && (isalnum(ptr[i]) || ptr[i] == '_')) {
-          i--;
-        }
-        int start_ident = i + 1;
-
-        if (start_ident <= end_ident) {
-          int len = end_ident - start_ident + 1;
-          char var_name[256];
-          strncpy(var_name, ptr + start_ident, len);
-          var_name[len] = 0;
-
-          char *type_name = NULL;
-          Symbol *sym = find_symbol_in_all(g_ctx, var_name);
-
-          if (sym) {
-            if (sym->type_info) {
-              type_name = type_to_string(sym->type_info);
-            } else if (sym->type_name) {
-              type_name = sym->type_name;
+    // Context-aware completion (Dot access)
+    if (g_last_src)
+    {
+        // Simple line access
+        int cur_line = 0;
+
+        char *ptr = g_last_src;
+        // Fast forward to line
+        while (*ptr && cur_line < line)
+        {
+            if (*ptr == '\n')
+            {
+                cur_line++;
             }
-          }
+            ptr++;
+        }
 
-          if (type_name) {
-            char clean_name[256];
-            char *src = type_name;
-            if (0 == strncmp(src, "struct ", 7)) {
-              src += 7;
-            }
-            char *dst = clean_name;
-            while (*src && *src != '*') {
-              *dst++ = *src++;
+        if (col > 0 && ptr[col - 1] == '.')
+        {
+            // Found dot!
+            // Scan backwards for identifier: [whitespace] [ident] .
+            int i = col - 2;
+            while (i >= 0 && (ptr[i] == ' ' || ptr[i] == '\t'))
+            {
+                i--;
             }
-            *dst = 0;
-
-            // Lookup struct.
-            StructDef *sd = g_ctx->struct_defs;
-            while (sd) {
-              if (0 == strcmp(sd->name, clean_name)) {
-                char *json_fields = malloc(1024 * 1024);
-                char *pj = json_fields;
-                pj += sprintf(pj, "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[");
-
-                int ffirst = 1;
-                if (sd->node && sd->node->strct.fields) {
-                  ASTNode *field = sd->node->strct.fields;
-                  while (field) {
-                    if (!ffirst) {
-                      pj += sprintf(pj, ",");
-                    }
-                    pj += sprintf(
-                        pj,
-                        "{\"label\":\"%s\",\"kind\":5,\"detail\":\"field %s\"}",
-                        field->field.name, field->field.type); // Kind 5 = Field
-                    ffirst = 0;
-                    field = field->next;
-                  }
+
+            if (i >= 0)
+            {
+                int end_ident = i;
+                while (i >= 0 && (isalnum(ptr[i]) || ptr[i] == '_'))
+                {
+                    i--;
                 }
+                int start_ident = i + 1;
+
+                if (start_ident <= end_ident)
+                {
+                    int len = end_ident - start_ident + 1;
+                    char var_name[256];
+                    strncpy(var_name, ptr + start_ident, len);
+                    var_name[len] = 0;
+
+                    char *type_name = NULL;
+                    Symbol *sym = find_symbol_in_all(g_ctx, var_name);
+
+                    if (sym)
+                    {
+                        if (sym->type_info)
+                        {
+                            type_name = type_to_string(sym->type_info);
+                        }
+                        else if (sym->type_name)
+                        {
+                            type_name = sym->type_name;
+                        }
+                    }
 
-                pj += sprintf(pj, "]}");
-                fprintf(stdout, "Content-Length: %ld\r\n\r\n%s",
-                        strlen(json_fields), json_fields);
-                fflush(stdout);
-                free(json_fields);
-                free(json);
-                return; // Done, yippee.
-              }
-              sd = sd->next;
+                    if (type_name)
+                    {
+                        char clean_name[256];
+                        char *src = type_name;
+                        if (0 == strncmp(src, "struct ", 7))
+                        {
+                            src += 7;
+                        }
+                        char *dst = clean_name;
+                        while (*src && *src != '*')
+                        {
+                            *dst++ = *src++;
+                        }
+                        *dst = 0;
+
+                        // Lookup struct.
+                        StructDef *sd = g_ctx->struct_defs;
+                        while (sd)
+                        {
+                            if (0 == strcmp(sd->name, clean_name))
+                            {
+                                char *json_fields = malloc(1024 * 1024);
+                                char *pj = json_fields;
+                                pj += sprintf(pj, "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[");
+
+                                int ffirst = 1;
+                                if (sd->node && sd->node->strct.fields)
+                                {
+                                    ASTNode *field = sd->node->strct.fields;
+                                    while (field)
+                                    {
+                                        if (!ffirst)
+                                        {
+                                            pj += sprintf(pj, ",");
+                                        }
+                                        pj += sprintf(
+                                            pj,
+                                            "{\"label\":\"%s\",\"kind\":5,\"detail\":\"field %s\"}",
+                                            field->field.name, field->field.type); // Kind 5 = Field
+                                        ffirst = 0;
+                                        field = field->next;
+                                    }
+                                }
+
+                                pj += sprintf(pj, "]}");
+                                fprintf(stdout, "Content-Length: %ld\r\n\r\n%s",
+                                        strlen(json_fields), json_fields);
+                                fflush(stdout);
+                                free(json_fields);
+                                free(json);
+                                return; // Done, yippee.
+                            }
+                            sd = sd->next;
+                        }
+                    }
+                }
             }
-          }
         }
-      }
     }
-  }
 
-  char *json = xmalloc(1024 * 1024); // 1MB buffer.
-  char *p = json;
-  p += sprintf(p, "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[");
+    char *json = xmalloc(1024 * 1024); // 1MB buffer.
+    char *p = json;
+    p += sprintf(p, "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[");
 
-  int first = 1;
+    int first = 1;
 
-  // Functions
-  FuncSig *f = g_ctx->func_registry;
-  while (f) {
-    if (!first) {
-      p += sprintf(p, ",");
+    // Functions
+    FuncSig *f = g_ctx->func_registry;
+    while (f)
+    {
+        if (!first)
+        {
+            p += sprintf(p, ",");
+        }
+        p += sprintf(p, "{\"label\":\"%s\",\"kind\":3,\"detail\":\"fn %s(...)\"}", f->name,
+                     f->name); // Kind 3 = Function
+        first = 0;
+        f = f->next;
     }
-    p += sprintf(p, "{\"label\":\"%s\",\"kind\":3,\"detail\":\"fn %s(...)\"}",
-                 f->name,
-                 f->name); // Kind 3 = Function
-    first = 0;
-    f = f->next;
-  }
-
-  // Structs
-  StructDef *s = g_ctx->struct_defs;
-  while (s) {
-    if (!first) {
-      p += sprintf(p, ",");
+
+    // Structs
+    StructDef *s = g_ctx->struct_defs;
+    while (s)
+    {
+        if (!first)
+        {
+            p += sprintf(p, ",");
+        }
+        p += sprintf(p, "{\"label\":\"%s\",\"kind\":22,\"detail\":\"struct %s\"}", s->name,
+                     s->name); // Kind 22 = Struct
+        first = 0;
+        s = s->next;
     }
-    p += sprintf(p, "{\"label\":\"%s\",\"kind\":22,\"detail\":\"struct %s\"}",
-                 s->name,
-                 s->name); // Kind 22 = Struct
-    first = 0;
-    s = s->next;
-  }
-
-  p += sprintf(p, "]}");
-
-  fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(json), json);
-  fflush(stdout);
-  free(json);
+
+    p += sprintf(p, "]}");
+
+    fprintf(stdout, "Content-Length: %ld\r\n\r\n%s", strlen(json), json);
+    fflush(stdout);
+    free(json);
 }
diff --git a/src/lsp/lsp_index.c b/src/lsp/lsp_index.c
index fdd0cf8..d952b77 100644
--- a/src/lsp/lsp_index.c
+++ b/src/lsp/lsp_index.c
@@ -4,168 +4,201 @@
 #include <stdlib.h>
 #include <string.h>
 
-LSPIndex *lsp_index_new() { return calloc(1, sizeof(LSPIndex)); }
-
-void lsp_index_free(LSPIndex *idx) {
-  if (!idx) {
-    return;
-  }
-  LSPRange *c = idx->head;
-  while (c) {
-    LSPRange *n = c->next;
-    if (c->hover_text) {
-      free(c->hover_text);
-    }
-    free(c);
-    c = n;
-  }
-  free(idx);
+LSPIndex *lsp_index_new()
+{
+    return calloc(1, sizeof(LSPIndex));
 }
 
-void lsp_index_add(LSPIndex *idx, LSPRange *r) {
-  if (!idx->head) {
-    idx->head = r;
-    idx->tail = r;
-  } else {
-    idx->tail->next = r;
-    idx->tail = r;
-  }
+void lsp_index_free(LSPIndex *idx)
+{
+    if (!idx)
+    {
+        return;
+    }
+    LSPRange *c = idx->head;
+    while (c)
+    {
+        LSPRange *n = c->next;
+        if (c->hover_text)
+        {
+            free(c->hover_text);
+        }
+        free(c);
+        c = n;
+    }
+    free(idx);
 }
 
-void lsp_index_add_def(LSPIndex *idx, Token t, const char *hover,
-                       ASTNode *node) {
-  if (t.line <= 0) {
-    return;
-  }
-  LSPRange *r = calloc(1, sizeof(LSPRange));
-  r->type = RANGE_DEFINITION;
-  r->start_line = t.line - 1;
-  r->start_col = t.col - 1;
-  r->end_line = t.line - 1;
-  r->end_col = t.col - 1 + t.len;
-  if (hover) {
-    r->hover_text = strdup(hover);
-  }
-  r->node = node;
-
-  lsp_index_add(idx, r);
+void lsp_index_add(LSPIndex *idx, LSPRange *r)
+{
+    if (!idx->head)
+    {
+        idx->head = r;
+        idx->tail = r;
+    }
+    else
+    {
+        idx->tail->next = r;
+        idx->tail = r;
+    }
 }
 
-void lsp_index_add_ref(LSPIndex *idx, Token t, Token def_t, ASTNode *node) {
-  if (t.line <= 0 || def_t.line <= 0) {
-    return;
-  }
-  LSPRange *r = calloc(1, sizeof(LSPRange));
-  r->type = RANGE_REFERENCE;
-  r->start_line = t.line - 1;
-  r->start_col = t.col - 1;
-  r->end_line = t.line - 1;
-  r->end_col = t.col - 1 + t.len;
-
-  r->def_line = def_t.line - 1;
-  r->def_col = def_t.col - 1;
-  r->node = node;
-
-  lsp_index_add(idx, r);
-}
+void lsp_index_add_def(LSPIndex *idx, Token t, const char *hover, ASTNode *node)
+{
+    if (t.line <= 0)
+    {
+        return;
+    }
+    LSPRange *r = calloc(1, sizeof(LSPRange));
+    r->type = RANGE_DEFINITION;
+    r->start_line = t.line - 1;
+    r->start_col = t.col - 1;
+    r->end_line = t.line - 1;
+    r->end_col = t.col - 1 + t.len;
+    if (hover)
+    {
+        r->hover_text = strdup(hover);
+    }
+    r->node = node;
 
-LSPRange *lsp_find_at(LSPIndex *idx, int line, int col) {
-  LSPRange *curr = idx->head;
-  LSPRange *best = NULL;
+    lsp_index_add(idx, r);
+}
 
-  while (curr) {
-    if (line >= curr->start_line && line <= curr->end_line) {
-      if (line == curr->start_line && col < curr->start_col) {
-        curr = curr->next;
-        continue;
-      }
+void lsp_index_add_ref(LSPIndex *idx, Token t, Token def_t, ASTNode *node)
+{
+    if (t.line <= 0 || def_t.line <= 0)
+    {
+        return;
+    }
+    LSPRange *r = calloc(1, sizeof(LSPRange));
+    r->type = RANGE_REFERENCE;
+    r->start_line = t.line - 1;
+    r->start_col = t.col - 1;
+    r->end_line = t.line - 1;
+    r->end_col = t.col - 1 + t.len;
+
+    r->def_line = def_t.line - 1;
+    r->def_col = def_t.col - 1;
+    r->node = node;
+
+    lsp_index_add(idx, r);
+}
 
-      if (line == curr->end_line && col > curr->end_col) {
+LSPRange *lsp_find_at(LSPIndex *idx, int line, int col)
+{
+    LSPRange *curr = idx->head;
+    LSPRange *best = NULL;
+
+    while (curr)
+    {
+        if (line >= curr->start_line && line <= curr->end_line)
+        {
+            if (line == curr->start_line && col < curr->start_col)
+            {
+                curr = curr->next;
+                continue;
+            }
+
+            if (line == curr->end_line && col > curr->end_col)
+            {
+                curr = curr->next;
+                continue;
+            }
+
+            best = curr;
+        }
         curr = curr->next;
-        continue;
-      }
-
-      best = curr;
     }
-    curr = curr->next;
-  }
-  return best;
+    return best;
 }
 
 // Walker.
 
-void lsp_walk_node(LSPIndex *idx, ASTNode *node) {
-  if (!node) {
-    return;
-  }
-
-  // Definition logic.
-  if (node->type == NODE_FUNCTION) {
-    char hover[256];
-    sprintf(hover, "fn %s(...) -> %s", node->func.name,
-            node->func.ret_type ? node->func.ret_type : "void");
-    lsp_index_add_def(idx, node->token, hover, node);
-
-    // Recurse body.
-    lsp_walk_node(idx, node->func.body);
-  } else if (node->type == NODE_VAR_DECL) {
-    char hover[256];
-    sprintf(hover, "var %s", node->var_decl.name);
-    lsp_index_add_def(idx, node->token, hover, node);
-
-    lsp_walk_node(idx, node->var_decl.init_expr);
-  } else if (node->type == NODE_CONST) {
-    char hover[256];
-    sprintf(hover, "const %s", node->var_decl.name);
-    lsp_index_add_def(idx, node->token, hover, node);
-
-    lsp_walk_node(idx, node->var_decl.init_expr);
-  }
-
-  // Reference logic.
-  if (node->definition_token.line > 0 &&
-      node->definition_token.line != node->token.line) {
-    // It has a definition!
-    lsp_index_add_ref(idx, node->token, node->definition_token, node);
-  } else if (node->definition_token.line > 0) {
-    lsp_index_add_ref(idx, node->token, node->definition_token, node);
-  }
-
-  // General recursion.
-
-  switch (node->type) {
-  case NODE_ROOT:
-    lsp_walk_node(idx, node->root.children);
-    break;
-  case NODE_BLOCK:
-    lsp_walk_node(idx, node->block.statements);
-    break;
-  case NODE_IF:
-    lsp_walk_node(idx, node->if_stmt.condition);
-    lsp_walk_node(idx, node->if_stmt.then_body);
-    lsp_walk_node(idx, node->if_stmt.else_body);
-    break;
-  case NODE_WHILE:
-    lsp_walk_node(idx, node->while_stmt.condition);
-    lsp_walk_node(idx, node->while_stmt.body);
-    break;
-  case NODE_RETURN:
-    lsp_walk_node(idx, node->ret.value);
-    break;
-  case NODE_EXPR_BINARY:
-    lsp_walk_node(idx, node->binary.left);
-    lsp_walk_node(idx, node->binary.right);
-    break;
-  case NODE_EXPR_CALL:
-    lsp_walk_node(idx, node->call.callee);
-    lsp_walk_node(idx, node->call.args);
-    break;
-  default:
-    break;
-  }
-
-  // Walk next sibling.
-  lsp_walk_node(idx, node->next);
+void lsp_walk_node(LSPIndex *idx, ASTNode *node)
+{
+    if (!node)
+    {
+        return;
+    }
+
+    // Definition logic.
+    if (node->type == NODE_FUNCTION)
+    {
+        char hover[256];
+        sprintf(hover, "fn %s(...) -> %s", node->func.name,
+                node->func.ret_type ? node->func.ret_type : "void");
+        lsp_index_add_def(idx, node->token, hover, node);
+
+        // Recurse body.
+        lsp_walk_node(idx, node->func.body);
+    }
+    else if (node->type == NODE_VAR_DECL)
+    {
+        char hover[256];
+        sprintf(hover, "var %s", node->var_decl.name);
+        lsp_index_add_def(idx, node->token, hover, node);
+
+        lsp_walk_node(idx, node->var_decl.init_expr);
+    }
+    else if (node->type == NODE_CONST)
+    {
+        char hover[256];
+        sprintf(hover, "const %s", node->var_decl.name);
+        lsp_index_add_def(idx, node->token, hover, node);
+
+        lsp_walk_node(idx, node->var_decl.init_expr);
+    }
+
+    // Reference logic.
+    if (node->definition_token.line > 0 && node->definition_token.line != node->token.line)
+    {
+        // It has a definition!
+        lsp_index_add_ref(idx, node->token, node->definition_token, node);
+    }
+    else if (node->definition_token.line > 0)
+    {
+        lsp_index_add_ref(idx, node->token, node->definition_token, node);
+    }
+
+    // General recursion.
+
+    switch (node->type)
+    {
+    case NODE_ROOT:
+        lsp_walk_node(idx, node->root.children);
+        break;
+    case NODE_BLOCK:
+        lsp_walk_node(idx, node->block.statements);
+        break;
+    case NODE_IF:
+        lsp_walk_node(idx, node->if_stmt.condition);
+        lsp_walk_node(idx, node->if_stmt.then_body);
+        lsp_walk_node(idx, node->if_stmt.else_body);
+        break;
+    case NODE_WHILE:
+        lsp_walk_node(idx, node->while_stmt.condition);
+        lsp_walk_node(idx, node->while_stmt.body);
+        break;
+    case NODE_RETURN:
+        lsp_walk_node(idx, node->ret.value);
+        break;
+    case NODE_EXPR_BINARY:
+        lsp_walk_node(idx, node->binary.left);
+        lsp_walk_node(idx, node->binary.right);
+        break;
+    case NODE_EXPR_CALL:
+        lsp_walk_node(idx, node->call.callee);
+        lsp_walk_node(idx, node->call.args);
+        break;
+    default:
+        break;
+    }
+
+    // Walk next sibling.
+    lsp_walk_node(idx, node->next);
 }
 
-void lsp_build_index(LSPIndex *idx, ASTNode *root) { lsp_walk_node(idx, root); }
+void lsp_build_index(LSPIndex *idx, ASTNode *root)
+{
+    lsp_walk_node(idx, root);
+}
diff --git a/src/lsp/lsp_index.h b/src/lsp/lsp_index.h
index 8b8207b..f4aaf96 100644
--- a/src/lsp/lsp_index.h
+++ b/src/lsp/lsp_index.h
@@ -4,31 +4,36 @@
 
 #include "parser.h"
 
-typedef enum { RANGE_DEFINITION, RANGE_REFERENCE } RangeType;
-
-typedef struct LSPRange {
-  int start_line;
-  int start_col;
-  int end_line;
-  int end_col; // Approximation.
-  RangeType type;
-  int def_line;
-  int def_col;
-  char *hover_text;
-  ASTNode *node;
-  struct LSPRange *next;
+typedef enum
+{
+    RANGE_DEFINITION,
+    RANGE_REFERENCE
+} RangeType;
+
+typedef struct LSPRange
+{
+    int start_line;
+    int start_col;
+    int end_line;
+    int end_col; // Approximation.
+    RangeType type;
+    int def_line;
+    int def_col;
+    char *hover_text;
+    ASTNode *node;
+    struct LSPRange *next;
 } LSPRange;
 
-typedef struct LSPIndex {
-  LSPRange *head;
-  LSPRange *tail;
+typedef struct LSPIndex
+{
+    LSPRange *head;
+    LSPRange *tail;
 } LSPIndex;
 
 // API.
 LSPIndex *lsp_index_new();
 void lsp_index_free(LSPIndex *idx);
-void lsp_index_add_def(LSPIndex *idx, Token t, const char *hover,
-                       ASTNode *node);
+void lsp_index_add_def(LSPIndex *idx, Token t, const char *hover, ASTNode *node);
 void lsp_index_add_ref(LSPIndex *idx, Token t, Token def_t, ASTNode *node);
 LSPRange *lsp_find_at(LSPIndex *idx, int line, int col);
 
diff --git a/src/lsp/lsp_main.c b/src/lsp/lsp_main.c
index a9a9f06..fbe5312 100644
--- a/src/lsp/lsp_main.c
+++ b/src/lsp/lsp_main.c
@@ -6,47 +6,55 @@
 #include <unistd.h>
 
 // Simple Main Loop for LSP.
-int lsp_main(int argc, char **argv) {
-  (void)argc;
-  (void)argv;
-  fprintf(stderr, "zls: Zen Language Server starting...\n");
-
-  while (1) {
-    // Read headers
-    int content_len = 0;
-    char line[512];
-    while (fgets(line, sizeof(line), stdin)) {
-      if (0 == strcmp(line, "\r\n")) {
-        break; // End of headers
-      }
-      if (0 == strncmp(line, "Content-Length: ", 16)) {
-        content_len = atoi(line + 16);
-      }
+int lsp_main(int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+    fprintf(stderr, "zls: Zen Language Server starting...\n");
+
+    while (1)
+    {
+        // Read headers
+        int content_len = 0;
+        char line[512];
+        while (fgets(line, sizeof(line), stdin))
+        {
+            if (0 == strcmp(line, "\r\n"))
+            {
+                break; // End of headers
+            }
+            if (0 == strncmp(line, "Content-Length: ", 16))
+            {
+                content_len = atoi(line + 16);
+            }
+        }
+
+        if (content_len <= 0)
+        {
+            // Maybe EOF or error?
+            if (feof(stdin))
+            {
+                break;
+            }
+            continue; // Wait for more (yeah we gotta work on this).
+        }
+
+        // Read body.
+        char *body = malloc(content_len + 1);
+        if (fread(body, 1, content_len, stdin) != (size_t)content_len)
+        {
+            fprintf(stderr, "zls: Error reading body\n");
+            free(body);
+            break;
+        }
+        body[content_len] = 0;
+
+        // Process JSON-RPC.
+        fprintf(stderr, "zls: Received: %s\n", body);
+        handle_request(body);
+
+        free(body);
     }
 
-    if (content_len <= 0) {
-      // Maybe EOF or error?
-      if (feof(stdin)) {
-        break;
-      }
-      continue; // Wait for more (yeah we gotta work on this).
-    }
-
-    // Read body.
-    char *body = malloc(content_len + 1);
-    if (fread(body, 1, content_len, stdin) != (size_t)content_len) {
-      fprintf(stderr, "zls: Error reading body\n");
-      free(body);
-      break;
-    }
-    body[content_len] = 0;
-
-    // Process JSON-RPC.
-    fprintf(stderr, "zls: Received: %s\n", body);
-    handle_request(body);
-
-    free(body);
-  }
-
-  return 0;
+    return 0;
 }