merge tools/lsp (full) — 184 completions, hover, go-to-def, live diagnostics, enhanced VSCode extension

el-compiler/runtime/el_runtime.c

@@ -155,6 +155,39 @@ el_val_t readline(void) {
     return el_wrap_str(el_strdup(buf));
 }
 
+/* __read_n — read exactly n bytes from stdin.
+ * Allocates a buffer of size n+1, calls fread(buf, 1, n, stdin) to read
+ * exactly n raw bytes (including \r, \n, NUL, etc.), null-terminates, and
+ * returns the buffer as an El String.  Returns "" on EOF or I/O error.
+ *
+ * Used by the El LSP server to read JSON-RPC message bodies after parsing
+ * the Content-Length header.  readline() cannot be used for the body because
+ * it stops at the first \n and LSP JSON bodies are not newline-terminated.  */
+el_val_t __read_n(el_val_t nv) {
+    int64_t n = EL_INT(nv);
+    if (n <= 0) return el_wrap_str(el_strdup(""));
+    char* buf = malloc((size_t)n + 1);
+    if (!buf) { fputs("el_runtime: __read_n: out of memory\n", stderr); return el_wrap_str(el_strdup("")); }
+    size_t got = fread(buf, 1, (size_t)n, stdin);
+    buf[got] = '\0';
+    if (got == 0) { free(buf); return el_wrap_str(el_strdup("")); }
+    /* Track in arena so the allocation is freed when the request ends. */
+    el_arena_track(buf);
+    return el_wrap_str(buf);
+}
+
+/* __print_raw — write a string to stdout without any modification.
+ * Unlike println/print (which call puts/fputs and may add newlines or flush
+ * in platform-specific ways), this uses fwrite with the exact byte count so
+ * that embedded \r\n pairs in LSP Content-Length headers survive intact.    */
+void __print_raw(el_val_t sv) {
+    const char* s = EL_CSTR(sv);
+    if (!s) return;
+    size_t len = strlen(s);
+    fwrite(s, 1, len, stdout);
+    fflush(stdout);
+}
+
 /* ── String builtins ─────────────────────────────────────────────────────── */
 
 el_val_t el_str_concat(el_val_t av, el_val_t bv) {

el-compiler/runtime/el_runtime.h

@@ -80,6 +80,16 @@ void      println(el_val_t s);
 void      print(el_val_t s);
 el_val_t  readline(void);
 
+/* __read_n — read exactly n bytes from stdin; returns String of length n.
+ * Returns "" on EOF or read error. Used by the El LSP server to read
+ * JSON-RPC message bodies after the Content-Length header is parsed.        */
+el_val_t  __read_n(el_val_t n);
+
+/* __print_raw — write a string to stdout using fwrite + fflush, preserving
+ * embedded \r\n byte pairs as-is. Used by the El LSP server to emit
+ * Content-Length framed JSON-RPC messages.                                  */
+void      __print_raw(el_val_t s);
+
 /* ── String builtins ─────────────────────────────────────────────────────── */
 
 el_val_t  el_str_concat(el_val_t a, el_val_t b);

el-compiler/src/codegen.el

@@ -2049,6 +2049,9 @@ fn builtin_arity(name: String) -> Int {
     if str_eq(name, "println") { return 1 }
     if str_eq(name, "print") { return 1 }
     if str_eq(name, "readline") { return 0 }
+    // LSP seed primitives
+    if str_eq(name, "__read_n") { return 1 }
+    if str_eq(name, "__print_raw") { return 1 }
     // String
     if str_eq(name, "el_str_concat") { return 2 }
     if str_eq(name, "str_eq") { return 2 }