From ed3be39037ec1500602bb74139771116af5017ed Mon Sep 17 00:00:00 2001
From: Krzosa Karol <krzosa.karol@gmail.com>
Date: Sun, 1 Feb 2026 17:45:15 +0100
Subject: [PATCH] Begin data_desc

---
 src/text_editor/data_desc.cpp   | 184 ++++++++++++++++++++++++++++++++
 src/text_editor/text_editor.cpp |   1 +
 2 files changed, 185 insertions(+)
 create mode 100644 src/text_editor/data_desc.cpp

diff --git a/src/text_editor/data_desc.cpp b/src/text_editor/data_desc.cpp
new file mode 100644
index 0000000..cac0883
--- /dev/null
+++ b/src/text_editor/data_desc.cpp
@@ -0,0 +1,184 @@
+namespace DataDesc {
+struct Lexer {
+    Allocator allocator;
+    char *at;
+    char *start;
+    char *end;
+
+    char *file;
+    int line, column;
+};
+
+enum TokenKind {
+    TokenKind_EOF,
+    TokenKind_String,
+    TokenKind_Colon,
+    TokenKind_Comma,
+    TokenKind_OpenBrace,
+    TokenKind_CloseBrace,
+    TokenKind_Error,
+};
+
+struct Token {
+    TokenKind kind;
+    union {
+        struct {char *data; Int len;};
+        String string;
+    };
+    int line, column;
+    char *file;
+};
+
+Lexer MakeLexer(Allocator allocator, String string, char *file) {
+    Assert(string.data != NULL && string.data != 0);
+    Lexer result = {allocator, string.data, string.data, string.data + string.len};
+    result.file = file;
+    return result;
+}
+
+char At(Lexer *lex) {
+    if (lex->at < lex->end) {
+        return lex->at[0];
+    }
+    return 0;
+}
+
+void Advance(Lexer *lex) {
+    if (lex->at >= lex->end) {
+        return;
+    }
+    if (lex->at[0] == '\n') {
+        lex->line += 1;
+        lex->column = 0;
+    }
+    lex->column += 1;
+    lex->at += 1;
+}
+
+void EatWhitespace(Lexer *lex) {
+    while (IsWhitespace(At(lex))) {
+        Advance(lex);
+    }
+}
+
+void LexString(Lexer *lex, Token *t) {
+    t->kind = TokenKind_String;
+    char end_char = t->data[0];
+    t->data += 1;
+    for (;;) {
+        char c = At(lex);
+        if (c == 0) {
+            break;
+        }
+        if (c == end_char) {
+            break;
+        }
+        if (c == '\\') {
+            Advance(lex);
+        }
+        Advance(lex);
+    }
+    Advance(lex);
+    t->len = (Int)(lex->at - t->data) - 1;
+}
+
+bool IsOkForIdent(char cc) {
+    bool result = IsAlphanumeric(cc) || cc == '_' || cc == '/' || cc == '-' || cc == '.' || cc == '@';
+    return result;
+}
+
+Token Next(Lexer *lex) {
+    EatWhitespace(lex);
+    Token t = {};
+    t.data = lex->at;
+    t.len = 1;
+    t.line = lex->line;
+    t.column = lex->column;
+    t.file = lex->file;
+    char c = At(lex);
+    Advance(lex);
+
+    if (c == 0) {
+        t.kind = TokenKind_EOF;
+    } else if (c == '{') {
+        t.kind = TokenKind_OpenBrace;
+    } else if (c == '}') {
+        t.kind = TokenKind_CloseBrace;
+    } else if (c == ':') {
+        t.kind = TokenKind_Colon;
+    } else if (c == ',') {
+        t.kind = TokenKind_Comma;
+    } else if (c == '"') {
+        LexString(lex, &t);
+    } else if (c == '`') {
+        LexString(lex, &t);
+    } else if (IsOkForIdent(c)) {
+        t.kind = TokenKind_String;
+        for (;;) {
+            char cc = At(lex);
+            bool ok = IsOkForIdent(cc);
+            if (!ok) {
+                break;
+            }
+            Advance(lex);
+        }
+        t.len = (Int)(lex->at - t.data);
+    } else {
+        t.kind = TokenKind_Error;
+        t.string = Format(lex->allocator, "Got invalid character when parsing: '%c'", c);
+        return t;
+    }
+
+    return t;
+}
+
+void RunDataDescriptionTest() {
+    Scratch scratch;
+    String s = "{/usr/bin/python3, `Hidden`, Input:Clipboard}";
+    Lexer lexer = MakeLexer(scratch, s, "test");
+    {
+        Token tok = {};
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_OpenBrace);
+        Assert(tok.len == 1);
+        Assert(tok.data[0] == '{');
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_String);
+        Assert(tok.string == "/usr/bin/python3");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_Comma);
+        Assert(tok.string == ",");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_String);
+        Assert(tok.string == "Hidden");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_Comma);
+        Assert(tok.string == ",");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_String);
+        Assert(tok.string == "Input");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_Colon);
+        Assert(tok.string == ":");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_String);
+        Assert(tok.string == "Clipboard");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_CloseBrace);
+        Assert(tok.string == "}");
+
+        tok = Next(&lexer);
+        Assert(tok.kind == TokenKind_EOF);
+    }
+
+
+} RegisterFunction(&TestFunctions, RunDataDescriptionTest);
+}
diff --git a/src/text_editor/text_editor.cpp b/src/text_editor/text_editor.cpp
index 7990f33..2c3cf83 100644
--- a/src/text_editor/text_editor.cpp
+++ b/src/text_editor/text_editor.cpp
@@ -45,6 +45,7 @@
 #include "text_editor.h"
 #include "globals.cpp"
 #include "coroutines.cpp"
+#include "data_desc.cpp"
 #include "buffer.cpp"
 #include "view.cpp"
 #include "window.cpp"