From 55247a3f12a9eee7ba3fd7ca6d8fcea7a82c20f3 Mon Sep 17 00:00:00 2001
From: Zuhaitz Méndez Fernández de Aránguiz <zuhaitz@debian>
Date: Sun, 11 Jan 2026 15:11:00 +0000
Subject: Added src/ folder. Now I will add the rest.

---
 src/lsp/json_rpc.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 src/lsp/json_rpc.c

(limited to 'src/lsp/json_rpc.c')

diff --git a/src/lsp/json_rpc.c b/src/lsp/json_rpc.c
new file mode 100644
index 0000000..008a147
--- /dev/null
+++ b/src/lsp/json_rpc.c
@@ -0,0 +1,192 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "json_rpc.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;
+}
+
+// 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++;
+        }
+    }
+    *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 lsp_check_file(const char *uri, const char *src);
+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);
+        }
+
+        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/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);
+        }
+    }
+}
-- 
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