Added syntax colorization. Remove all references to deprecated lark_to_lezer module.

Added syntax colorization
2026-02-07 11:08:34 +01:00 · 2026-02-07 10:52:40 +01:00
17 changed files with 883 additions and 519 deletions
--- a/docs/DataGrid
+++ b/docs/DataGrid
@@ -700,11 +700,99 @@ export const daisyTheme = [
 ]
 ```

-### Lezer Grammar (Translated from lark)
+### CodeMirror Simple Mode (Generated from lark)

-The lark grammar is translated to Lezer format for client-side parsing:
+The lark grammar terminals are extracted and converted to CodeMirror 5 Simple Mode format for syntax highlighting:

 ```javascript
+// Generated from lark grammar terminals
+CodeMirror.defineSimpleMode("formatting-dsl", {
+  start: [
+    // Comments
+    {regex: /#.*/, token: "comment"},
+
+    // Keywords
+    {regex: /\b(?:column|row|cell|if|not|and|or|in|between|case)\b/, token: "keyword"},
+
+    // Built-in functions
+    {regex: /\b(?:style|format)\b/, token: "builtin"},
+
+    // Operators
+    {regex: /\b(?:contains|startswith|endswith|isempty|isnotempty)\b/, token: "operator"},
+    {regex: /==|!=|<=|>=|<|>/, token: "operator"},
+
+    // References
+    {regex: /\b(?:value|col)\b/, token: "variable-2"},
+
+    // Booleans
+    {regex: /\b(?:True|False|true|false)\b/, token: "atom"},
+
+    // Numbers
+    {regex: /\b\d+(?:\.\d+)?\b/, token: "number"},
+
+    // Strings
+    {regex: /"(?:[^\\]|\\.)*?"/, token: "string"},
+    {regex: /'(?:[^\\]|\\.)*?'/, token: "string"},
+
+    // Cell IDs
+    {regex: /\btcell_[a-zA-Z0-9_-]+\b/, token: "variable-3"},
+  ]
+});
+```
+
+**Token classes**:
+- `comment` - Comments (`#`)
+- `keyword` - Keywords (`column`, `row`, `cell`, `if`, `not`, `and`, `or`, `in`, `between`, `case`)
+- `builtin` - Built-in functions (`style`, `format`)
+- `operator` - Comparison/string operators (`==`, `<`, `contains`, etc.)
+- `variable-2` - Special variables (`value`, `col`)
+- `atom` - Literals (`True`, `False`)
+- `number` - Numeric literals
+- `string` - String literals
+- `variable-3` - Cell IDs (`tcell_*`)
+
+These classes are styled via CSS using DaisyUI color variables for automatic theme support.
+
+### Editor Setup (CodeMirror 5)
+
+```javascript
+function initDslEditor(config) {
+  const editor = CodeMirror(container, {
+    value: initialValue,
+    mode: "formatting-dsl",  // Use generated Simple Mode
+    lineNumbers: true,
+    extraKeys: {
+      "Ctrl-Space": "autocomplete"
+    },
+    hintOptions: {
+      hint: dslHint,  // Server-side completions
+      completeSingle: false
+    },
+    gutters: ["CodeMirror-linenumbers", "CodeMirror-lint-markers"],
+    lint: {
+      getAnnotations: dslLint,  // Server-side validation
+      async: true
+    }
+  });
+
+  return editor;
+}
+```
+
+**Note**: The Simple Mode provides instant syntax highlighting (approximative, lexer-level). Server-side validation via `/myfasthtml/validations` provides accurate error reporting.
+
+---
+
+## CodeMirror Integration (Deprecated - CodeMirror 6)
+
+The following sections describe the original approach using CodeMirror 6 + Lezer, which was abandoned due to bundler requirements incompatible with FastHTML.
+
+### ~~Lezer Grammar (Translated from lark)~~ (Deprecated)
+
+~~The lark grammar is translated to Lezer format for client-side parsing:~~
+
+```javascript
+// DEPRECATED: CodeMirror 6 + Lezer approach (requires bundler)
 // formatrules.grammar (Lezer)

@top Program { scope+ }
@@ -807,9 +895,10 @@ kw<term> { @specialize[@name={term}]<Name, term> }
@detectDelim
 ```

-### Editor Setup
+### ~~Editor Setup~~ (Deprecated - CodeMirror 6)

 ```javascript
+// DEPRECATED: CodeMirror 6 approach (requires bundler, incompatible with FastHTML)
 import { EditorState } from '@codemirror/state'
 import { EditorView, keymap, lineNumbers, drawSelection } from '@codemirror/view'
 import { defaultKeymap, indentWithTab } from '@codemirror/commands'
@@ -875,54 +964,31 @@ Both `lark` and `pyparsing` are mature Python parsing libraries. We chose **lark
 | Criterion | lark | pyparsing |
 |-----------|------|-----------|
 | **Grammar definition** | Declarative EBNF string | Python combinators |
-| **Portability to Lezer** | Direct translation possible | Manual rewrite required |
+| **Regex extraction** | Easy to extract terminals | Embedded in Python logic |
 | **Grammar readability** | Standard BNF-like notation | Embedded in Python code |
 | **Maintenance** | Single grammar source | Two separate grammars to sync |

 **The key factor**: We need the same grammar for both:
 1. **Server-side** (Python): Validation and execution
-2. **Client-side** (JavaScript): Syntax highlighting and autocompletion
+2. **Client-side** (JavaScript): Syntax highlighting

-With lark's declarative EBNF grammar, we can translate it to Lezer (CodeMirror 6's parser system) with minimal effort. With pyparsing, the grammar is embedded in Python logic, making extraction and translation significantly harder.
+With lark's declarative EBNF grammar, we can extract terminal regex patterns and translate them to CodeMirror Simple Mode for client-side syntax highlighting. With pyparsing, the grammar is embedded in Python logic, making extraction significantly harder.

-**Example comparison:**
+### Why CodeMirror 5 (not 6)

-```python
-# lark - declarative grammar (easy to translate)
-grammar = """
-    scope: "column" NAME ":" NEWLINE INDENT rule+ DEDENT
-    NAME: /[a-zA-Z_][a-zA-Z0-9_]*/
-"""
-```
+For the web-based DSL editor, we chose **CodeMirror 5**:

-```javascript
-// Lezer - similar structure
-@top Program { scope+ }
-scope { "column" Name ":" newline indent rule+ dedent }
-Name { @asciiLetter (@asciiLetter | @digit | "_")* }
-```
+| Criterion | CodeMirror 5 | CodeMirror 6 | Monaco | Ace |
+|-----------|--------------|--------------|--------|-----|
+| **Bundle requirements** | CDN ready | Requires bundler | ~2MB | ~300KB |
+| **FastHTML compatibility** | Direct `<script>` include | Not compatible | Requires build | Partial |
+| **Custom languages** | Simple Mode (regex) | Lezer parser | Monarch tokenizer | Custom modes |
+| **Theming** | CSS classes | CSS variables | JSON themes | CSS |
+| **DaisyUI integration** | CSS classes + variables | Native (CSS vars) | Requires mapping | Partial |

-```python
-# pyparsing - grammar in Python code (hard to translate)
-NAME = Word(alphas, alphanums + "_")
-scope = Keyword("column") + NAME + ":" + LineEnd() + IndentedBlock(rule)
-```
+**Key constraint**: CodeMirror 6 requires a bundler (Webpack, Rollup, etc.) which is incompatible with FastHTML's direct script inclusion approach. CodeMirror 5's Simple Mode addon allows us to define syntax highlighting using regex patterns extracted from the lark grammar.

-### Why CodeMirror 6
-
-For the web-based DSL editor, we chose **CodeMirror 6**:
-
-| Criterion | CodeMirror 6 | Monaco | Ace |
-|-----------|--------------|--------|-----|
-| **Bundle size** | ~150KB | ~2MB | ~300KB |
-| **Custom languages** | Lezer parser | Monarch tokenizer | Custom modes |
-| **Theming** | CSS variables | JSON themes | CSS |
-| **DaisyUI integration** | Native (CSS vars) | Requires mapping | Partial |
-| **Architecture** | Modern, modular | Monolithic | Legacy |
-
-CodeMirror 6's use of CSS variables makes it trivial to integrate with DaisyUI's theming system, ensuring visual consistency across the application.
-
-### Shared Grammar Architecture
+### Grammar Architecture

 ```
 ┌─────────────────────────────────────────────────────────────┐
@@ -934,15 +1000,18 @@ CodeMirror 6's use of CSS variables makes it trivial to integrate with DaisyUI's
              ▼                               ▼
 ┌─────────────────────────┐     ┌─────────────────────────────┐
 │     Python (Server)      │     │    JavaScript (Client)       │
-│     lark parser          │     │    Lezer parser              │
-│                          │     │    (translated from lark)    │
+│     lark parser          │     │    CodeMirror Simple Mode    │
+│                          │     │    (regex from terminals)    │
 │  • Validation            │     │                              │
 │  • Execution             │     │  • Syntax highlighting       │
-│  • Error messages        │     │  • Autocompletion            │
-│  • Preset resolution     │     │  • Error markers             │
+│  • Error messages        │     │    (approximative, instant)  │
+│  • Preset resolution     │     │                              │
+│  • Autocompletion logic  │     │  • Autocompletion display    │
 └─────────────────────────┘     └─────────────────────────────┘
 ```

+**Note**: Client-side syntax highlighting is **approximative** (lexer-level only) but **instantaneous**. Server-side validation provides accurate error reporting with debouncing.
+
 ---

 ## Autocompletion API
@@ -1258,12 +1327,13 @@ The following features are excluded from autocompletion for simplicity:
 | Unit Tests (Completion) | :white_check_mark: ~50 tests | `tests/core/formatting/dsl/test_completion.py` |
 | REST Endpoint | :white_check_mark: Implemented | `src/myfasthtml/core/utils.py` → `/myfasthtml/completions` |
 | **Client-side** | | |
-| Lark to Lezer converter | :white_check_mark: Implemented | `src/myfasthtml/core/dsl/lark_to_lezer.py` |
+| Lark to Simple Mode converter | :o: To implement | - |
 | CodeMirror 5 assets | :white_check_mark: Implemented | `assets/codemirror.min.js`, `show-hint.min.js` |
 | DslEditor control | :white_check_mark: Implemented | `src/myfasthtml/controls/DslEditor.py` |
 | initDslEditor() JS | :white_check_mark: Implemented | `assets/myfasthtml.js` (static completions only) |
 | Dynamic completions (server calls) | :white_check_mark: Implemented | `assets/myfasthtml.js` → `/myfasthtml/completions` |
-| DaisyUI Theme | :o: Deferred | - |
+| DaisyUI Theme (CSS styling) | :o: To implement | `myfasthtml.css` |
+| Syntax highlighting (Simple Mode) | :o: To implement | `myfasthtml.js` |
 | **Syntax Validation (Linting)** | | |
 | REST Endpoint | :white_check_mark: Implemented | `src/myfasthtml/core/utils.py` → `/myfasthtml/validations` |
 | CodeMirror lint integration | :white_check_mark: Implemented | `assets/myfasthtml.js` → `dslLint()` |
@@ -1400,14 +1470,23 @@ These warnings would be non-blocking (DSL still parses) but displayed with a dif

 1. ~~**Add `lark` to dependencies** in `pyproject.toml`~~ Done
 2. ~~**Implement autocompletion API**~~ Done
-3. ~~**Translate lark grammar to Lezer**~~ Done (`lark_to_lezer.py`)
-4. ~~**Build CodeMirror extension**~~ Done (`DslEditor.py` + `initDslEditor()`)
-5. ~~**Integrate with DataGrid** - connect DSL output to formatting engine~~ Done
+3. ~~**Build CodeMirror 5 wrapper**~~ Done (`DslEditor.py` + `initDslEditor()`)
+4. ~~**Integrate with DataGrid** - connect DSL output to formatting engine~~ Done
   - `DataGridFormattingEditor.on_content_changed()` dispatches rules to column/row/cell formats
   - `DataGrid.mk_body_cell_content()` applies formatting via `FormattingEngine`
-6. ~~**Implement dynamic client-side completions**~~ Done
+5. ~~**Implement dynamic client-side completions**~~ Done
   - Engine ID: `DSLDefinition.get_id()` passed via `completionEngineId` in JS config
   - Trigger: Hybrid (Ctrl+Space + auto after `.` `(` `"` and space)
   - Files modified:
-     - `src/myfasthtml/controls/DslEditor.py:134` - Added `completionEngineId`
-     - `src/myfasthtml/assets/myfasthtml.js:2138-2300` - Async fetch to `/myfasthtml/completions`
+     - `src/myfasthtml/controls/DslEditor.py:149` - Added `dslId`
+     - `src/myfasthtml/assets/myfasthtml.js:2138-2349` - Async fetch to `/myfasthtml/completions`
+6. ~~**Implement validation (linting)**~~ Done
+   - REST endpoint: `/myfasthtml/validations`
+   - CodeMirror lint addon integration in `initDslEditor()`
+7. **DaisyUI Theme for CodeMirror** - To implement
+   - Add CSS styles in `myfasthtml.css` mapping CodeMirror classes to DaisyUI variables
+   - Ensures editor adapts to theme changes (dark mode, etc.)
+8. **Syntax highlighting (Simple Mode)** - To implement
+   - Extract terminals from lark grammar → generate Simple Mode config
+   - Add Simple Mode addon (~3KB) to assets
+   - Register mode in `initDslEditor()`
--- a/src/myfasthtml/assets/Readme.md
+++ b/src/myfasthtml/assets/Readme.md
@@ -9,6 +9,7 @@ wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/codemirror.min.cs
 wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/hint/show-hint.min.js 
 wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/hint/show-hint.min.css
 wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/display/placeholder.min.js
-wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/addon/lint/lint.min.css
-wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/addon/lint/lint.min.js
+wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/lint/lint.min.css
+wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/lint/lint.min.js
+wget https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.20/addon/mode/simple.min.js
 ```
--- a/src/myfasthtml/assets/lint.min.js
+++ b/src/myfasthtml/assets/lint.min.js
@@ -1 +1 @@
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+!function(t){"object"==typeof exports&&"object"==typeof module?t(require("../../lib/codemirror")):"function"==typeof define&&define.amd?define(["../../lib/codemirror"],t):t(CodeMirror)}(function(p){"use strict";var h="CodeMirror-lint-markers",g="CodeMirror-lint-line-";function u(t){t.parentNode&&t.parentNode.removeChild(t)}function v(t,e,n,o){t=t,e=e,n=n,(i=document.createElement("div")).className="CodeMirror-lint-tooltip cm-s-"+t.options.theme,i.appendChild(n.cloneNode(!0)),(t.state.lint.options.selfContain?t.getWrapperElement():document.body).appendChild(i),p.on(document,"mousemove",a),a(e),null!=i.style.opacity&&(i.style.opacity=1);var i,r=i;function a(t){if(!i.parentNode)return p.off(document,"mousemove",a);var e=Math.max(0,t.clientY-i.offsetHeight-5),t=Math.max(0,Math.min(t.clientX+5,i.ownerDocument.defaultView.innerWidth-i.offsetWidth));i.style.top=e+"px",i.style.left=t+"px"}function l(){var t;p.off(o,"mouseout",l),r&&((t=r).parentNode&&(null==t.style.opacity&&u(t),t.style.opacity=0,setTimeout(function(){u(t)},600)),r=null)}var s=setInterval(function(){if(r)for(var t=o;;t=t.parentNode){if((t=t&&11==t.nodeType?t.host:t)==document.body)return;if(!t){l();break}}if(!r)return clearInterval(s)},400);p.on(o,"mouseout",l)}function a(s,t,e){for(var n in this.marked=[],(t=t instanceof Function?{getAnnotations:t}:t)&&!0!==t||(t={}),this.options={},this.linterOptions=t.options||{},o)this.options[n]=o[n];for(var n in t)o.hasOwnProperty(n)?null!=t[n]&&(this.options[n]=t[n]):t.options||(this.linterOptions[n]=t[n]);this.timeout=null,this.hasGutter=e,this.onMouseOver=function(t){var e=s,n=t.target||t.srcElement;if(/\bCodeMirror-lint-mark-/.test(n.className)){for(var n=n.getBoundingClientRect(),o=(n.left+n.right)/2,n=(n.top+n.bottom)/2,i=e.findMarksAt(e.coordsChar({left:o,top:n},"client")),r=[],a=0;a<i.length;++a){var l=i[a].__annotation;l&&r.push(l)}r.length&&!function(t,e,n){for(var o=n.target||n.srcElement,i=document.createDocumentFragment(),r=0;r<e.length;r++){var a=e[r];i.appendChild(M(a))}v(t,n,i,o)}(e,r,t)}},this.waitingFor=0}var o={highlightLines:!1,tooltips:!0,delay:500,lintOnChange:!0,getAnnotations:null,async:!1,selfContain:null,formatAnnotation:null,onUpdateLinting:null};function C(t){var n,e=t.state.lint;e.hasGutter&&t.clearGutter(h),e.options.highlightLines&&(n=t).eachLine(function(t){var e=t.wrapClass&&/\bCodeMirror-lint-line-\w+\b/.exec(t.wrapClass);e&&n.removeLineClass(t,"wrap",e[0])});for(var o=0;o<e.marked.length;++o)e.marked[o].clear();e.marked.length=0}function M(t){var e=(e=t.severity)||"error",n=document.createElement("div");return n.className="CodeMirror-lint-message CodeMirror-lint-message-"+e,void 0!==t.messageHTML?n.innerHTML=t.messageHTML:n.appendChild(document.createTextNode(t.message)),n}function l(e){var t,n,o,i,r,a,l=e.state.lint;function s(){a=-1,o.off("change",s)}!l||(t=(i=l.options).getAnnotations||e.getHelper(p.Pos(0,0),"lint"))&&(i.async||t.async?(i=t,r=(o=e).state.lint,a=++r.waitingFor,o.on("change",s),i(o.getValue(),function(t,e){o.off("change",s),r.waitingFor==a&&(e&&t instanceof p&&(t=e),o.operation(function(){c(o,t)}))},r.linterOptions,o)):(n=t(e.getValue(),l.linterOptions,e))&&(n.then?n.then(function(t){e.operation(function(){c(e,t)})}):e.operation(function(){c(e,n)})))}function c(t,e){var n=t.state.lint;if(n){for(var o,i,r=n.options,a=(C(t),function(t){for(var e=[],n=0;n<t.length;++n){var o=t[n],i=o.from.line;(e[i]||(e[i]=[])).push(o)}return e}(e)),l=0;l<a.length;++l){var s=a[l];if(s){for(var u=null,c=n.hasGutter&&document.createDocumentFragment(),f=0;f<s.length;++f){var m=s[f],d=m.severity;i=d=d||"error",u="error"==(o=u)?o:i,r.formatAnnotation&&(m=r.formatAnnotation(m)),n.hasGutter&&c.appendChild(M(m)),m.to&&n.marked.push(t.markText(m.from,m.to,{className:"CodeMirror-lint-mark CodeMirror-lint-mark-"+d,__annotation:m}))}n.hasGutter&&t.setGutterMarker(l,h,function(e,n,t,o,i){var r=document.createElement("div"),a=r;return r.className="CodeMirror-lint-marker CodeMirror-lint-marker-"+t,o&&((a=r.appendChild(document.createElement("div"))).className="CodeMirror-lint-marker CodeMirror-lint-marker-multiple"),0!=i&&p.on(a,"mouseover",function(t){v(e,t,n,a)}),r}(t,c,u,1<s.length,r.tooltips)),r.highlightLines&&t.addLineClass(l,"wrap",g+u)}}r.onUpdateLinting&&r.onUpdateLinting(e,a,t)}}function s(t){var e=t.state.lint;e&&(clearTimeout(e.timeout),e.timeout=setTimeout(function(){l(t)},e.options.delay))}p.defineOption("lint",!1,function(t,e,n){if(n&&n!=p.Init&&(C(t),!1!==t.state.lint.options.lintOnChange&&t.off("change",s),p.off(t.getWrapperElement(),"mouseover",t.state.lint.onMouseOver),clearTimeout(t.state.lint.timeout),delete t.state.lint),e){for(var o=t.getOption("gutters"),i=!1,r=0;r<o.length;++r)o[r]==h&&(i=!0);n=t.state.lint=new a(t,e,i);n.options.lintOnChange&&t.on("change",s),0!=n.options.tooltips&&"gutter"!=n.options.tooltips&&p.on(t.getWrapperElement(),"mouseover",n.onMouseOver),l(t)}}),p.defineExtension("performLint",function(){l(this)})});
--- a/src/myfasthtml/assets/myfasthtml.css
+++ b/src/myfasthtml/assets/myfasthtml.css
@@ -1187,3 +1187,213 @@
 .dt2-column-manager-label:hover {
    background-color: var(--color-base-300);
 }
+
+/* *********************************************** */
+/* ********** CodeMirror DaisyUI Theme *********** */
+/* *********************************************** */
+
+/* Theme selector - uses DaisyUI variables for automatic theme switching */
+.cm-s-daisy.CodeMirror {
+    background-color: var(--color-base-100);
+    color: var(--color-base-content);
+    font-family: var(--font-mono, ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Monaco, 'Courier New', monospace);
+    font-size: 14px;
+    line-height: 1.5;
+    height: auto;
+    border-radius: 0.5rem;
+    border: 1px solid var(--color-border);
+}
+
+/* Cursor */
+.cm-s-daisy .CodeMirror-cursor {
+    border-left-color: var(--color-primary);
+    border-left-width: 2px;
+}
+
+/* Selection */
+.cm-s-daisy .CodeMirror-selected {
+    background-color: var(--color-selection) !important;
+}
+
+.cm-s-daisy.CodeMirror-focused .CodeMirror-selected {
+    background-color: color-mix(in oklab, var(--color-primary) 30%, transparent) !important;
+}
+
+/* Line numbers and gutters */
+.cm-s-daisy .CodeMirror-gutters {
+    background-color: var(--color-base-200);
+    border-right: 1px solid var(--color-border);
+}
+
+.cm-s-daisy .CodeMirror-linenumber {
+    color: color-mix(in oklab, var(--color-base-content) 50%, transparent);
+    padding: 0 8px;
+}
+
+/* Active line */
+.cm-s-daisy .CodeMirror-activeline-background {
+    background-color: color-mix(in oklab, var(--color-base-content) 5%, transparent);
+}
+
+.cm-s-daisy .CodeMirror-activeline-gutter {
+    background-color: var(--color-base-300);
+}
+
+/* Matching brackets */
+.cm-s-daisy .CodeMirror-matchingbracket {
+    color: var(--color-success) !important;
+    font-weight: bold;
+}
+
+.cm-s-daisy .CodeMirror-nonmatchingbracket {
+    color: var(--color-error) !important;
+}
+
+/* *********************************************** */
+/* ******** CodeMirror Syntax Highlighting ******* */
+/* *********************************************** */
+
+/* Keywords (column, row, cell, if, not, and, or, in, between, case) */
+.cm-s-daisy .cm-keyword {
+    color: var(--color-primary);
+    font-weight: bold;
+}
+
+/* Built-in functions (style, format) */
+.cm-s-daisy .cm-builtin {
+    color: var(--color-secondary);
+    font-weight: 600;
+}
+
+/* Operators (==, <, >, contains, startswith, etc.) */
+.cm-s-daisy .cm-operator {
+    color: var(--color-warning);
+}
+
+/* Strings ("error", "EUR", etc.) */
+.cm-s-daisy .cm-string {
+    color: var(--color-success);
+}
+
+/* Numbers (0, 100, 3.14) */
+.cm-s-daisy .cm-number {
+    color: var(--color-accent);
+}
+
+/* Booleans (True, False, true, false) */
+.cm-s-daisy .cm-atom {
+    color: var(--color-info);
+}
+
+/* Special variables (value, col, row, cell) */
+.cm-s-daisy .cm-variable-2 {
+    color: var(--color-accent);
+    font-style: italic;
+}
+
+/* Cell IDs (tcell_*) */
+.cm-s-daisy .cm-variable-3 {
+    color: color-mix(in oklab, var(--color-base-content) 70%, transparent);
+}
+
+/* Comments (#...) */
+.cm-s-daisy .cm-comment {
+    color: color-mix(in oklab, var(--color-base-content) 50%, transparent);
+    font-style: italic;
+}
+
+/* Property names (bold=, color=, etc.) */
+.cm-s-daisy .cm-property {
+    color: var(--color-base-content);
+    opacity: 0.8;
+}
+
+/* Errors/invalid syntax */
+.cm-s-daisy .cm-error {
+    color: var(--color-error);
+    text-decoration: underline wavy;
+}
+
+/* *********************************************** */
+/* ********** CodeMirror Autocomplete ************ */
+/* *********************************************** */
+
+/* Autocomplete dropdown container */
+.CodeMirror-hints {
+    background-color: var(--color-base-100);
+    border: 1px solid var(--color-border);
+    border-radius: 0.5rem;
+    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
+    font-family: var(--font-mono, ui-monospace, monospace);
+    font-size: 13px;
+    max-height: 20em;
+    overflow-y: auto;
+}
+
+/* Individual hint items */
+.CodeMirror-hint {
+    color: var(--color-base-content);
+    padding: 4px 8px;
+    cursor: pointer;
+}
+
+/* Hovered/selected hint */
+.CodeMirror-hint-active {
+    background-color: var(--color-primary);
+    color: var(--color-primary-content);
+}
+
+/* *********************************************** */
+/* ********** CodeMirror Lint Markers ************ */
+/* *********************************************** */
+
+/* Lint gutter marker */
+.CodeMirror-lint-marker {
+    cursor: pointer;
+}
+
+.CodeMirror-lint-marker-error {
+    color: var(--color-error);
+}
+
+.CodeMirror-lint-marker-warning {
+    color: var(--color-warning);
+}
+
+/* Lint tooltip */
+.CodeMirror-lint-tooltip {
+    background-color: var(--color-base-100);
+    border: 1px solid var(--color-border);
+    border-radius: 0.375rem;
+    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+    color: var(--color-base-content);
+    font-family: var(--font-sans, ui-sans-serif, system-ui);
+    font-size: 13px;
+    padding: 8px 12px;
+    max-width: 400px;
+}
+
+.CodeMirror-lint-message-error {
+    color: var(--color-error);
+}
+
+.CodeMirror-lint-message-warning {
+    color: var(--color-warning);
+}
+
+/* *********************************************** */
+/* ********** DslEditor Wrapper Styles *********** */
+/* *********************************************** */
+
+/* Wrapper container for DslEditor */
+.mf-dsl-editor-wrapper {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+}
+
+/* Editor container */
+.mf-dsl-editor {
+    border-radius: 0.5rem;
+    overflow: hidden;
+}
--- a/src/myfasthtml/assets/myfasthtml.js
+++ b/src/myfasthtml/assets/myfasthtml.js
@@ -2250,6 +2250,27 @@ function initDslEditor(config) {
  // Mark lint function as async for CodeMirror
  dslLint.async = true;

+  /* --------------------------------------------------
+   * Register Simple Mode if available and config provided
+   * -------------------------------------------------- */
+
+  let modeName = null;
+
+  if (typeof CodeMirror.defineSimpleMode !== "undefined" && dsl && dsl.simpleModeConfig) {
+    // Generate unique mode name from DSL name
+    modeName = `dsl-${dsl.name.toLowerCase().replace(/\s+/g, '-')}`;
+
+    // Register the mode if not already registered
+    if (!CodeMirror.modes[modeName]) {
+      try {
+        CodeMirror.defineSimpleMode(modeName, dsl.simpleModeConfig);
+      } catch (err) {
+        console.error(`Failed to register Simple Mode for ${dsl.name}:`, err);
+        modeName = null;
+      }
+    }
+  }
+
  /* --------------------------------------------------
   * Create CodeMirror editor
   * -------------------------------------------------- */
@@ -2262,6 +2283,8 @@ function initDslEditor(config) {

  const editorOptions = {
    value: textarea.value || "",
+    mode: modeName || undefined,  // Use Simple Mode if available
+    theme: "daisy",  // Use DaisyUI theme for automatic theme switching
    lineNumbers: !!lineNumbers,
    readOnly: !!readonly,
    placeholder: placeholder || "",
--- a/src/myfasthtml/assets/simple.min.js
+++ b/src/myfasthtml/assets/simple.min.js
@@ -0,0 +1 @@
+!function(e){"object"==typeof exports&&"object"==typeof module?e(require("../../lib/codemirror")):"function"==typeof define&&define.amd?define(["../../lib/codemirror"],e):e(CodeMirror)}(function(v){"use strict";function h(e,t){if(!e.hasOwnProperty(t))throw new Error("Undefined state "+t+" in simple mode")}function k(e,t){if(!e)return/(?:)/;var n="";return e=e instanceof RegExp?(e.ignoreCase&&(n="i"),e.unicode&&(n+="u"),e.source):String(e),new RegExp((!1===t?"":"^")+"(?:"+e+")",n)}function g(e,t){(e.next||e.push)&&h(t,e.next||e.push),this.regex=k(e.regex),this.token=function(e){if(!e)return null;if(e.apply)return e;if("string"==typeof e)return e.replace(/\./g," ");for(var t=[],n=0;n<e.length;n++)t.push(e[n]&&e[n].replace(/\./g," "));return t}(e.token),this.data=e}v.defineSimpleMode=function(e,t){v.defineMode(e,function(e){return v.simpleMode(e,t)})},v.simpleMode=function(e,t){h(t,"start");var n,a={},o=t.meta||{},r=!1;for(n in t)if(n!=o&&t.hasOwnProperty(n))for(var i=a[n]=[],l=t[n],s=0;s<l.length;s++){var d=l[s];i.push(new g(d,t)),(d.indent||d.dedent)&&(r=!0)}var c,p,S,m,u={startState:function(){return{state:"start",pending:null,local:null,localState:null,indent:r?[]:null}},copyState:function(e){var t={state:e.state,pending:e.pending,local:e.local,localState:null,indent:e.indent&&e.indent.slice(0)};e.localState&&(t.localState=v.copyState(e.local.mode,e.localState)),e.stack&&(t.stack=e.stack.slice(0));for(var n=e.persistentStates;n;n=n.next)t.persistentStates={mode:n.mode,spec:n.spec,state:n.state==e.localState?t.localState:v.copyState(n.mode,n.state),next:t.persistentStates};return t},token:(m=e,function(e,t){var n,a;if(t.pending)return a=t.pending.shift(),0==t.pending.length&&(t.pending=null),e.pos+=a.text.length,a.token;if(t.local)return t.local.end&&e.match(t.local.end)?(n=t.local.endToken||null,t.local=t.localState=null):(n=t.local.mode.token(e,t.localState),t.local.endScan&&(a=t.local.endScan.exec(e.current()))&&(e.pos=e.start+a.index)),n;for(var o=S[t.state],r=0;r<o.length;r++){var i=o[r],l=(!i.data.sol||e.sol())&&e.match(i.regex);if(l){if(i.data.next?t.state=i.data.next:i.data.push?((t.stack||(t.stack=[])).push(t.state),t.state=i.data.push):i.data.pop&&t.stack&&t.stack.length&&(t.state=t.stack.pop()),i.data.mode){h=d=f=s=u=p=c=d=void 0;var s,d=m,c=t,p=i.data.mode,u=i.token;if(p.persistent)for(var f=c.persistentStates;f&&!s;f=f.next)(p.spec?function e(t,n){if(t===n)return!0;if(!t||"object"!=typeof t||!n||"object"!=typeof n)return!1;var a=0;for(var o in t)if(t.hasOwnProperty(o)){if(!n.hasOwnProperty(o)||!e(t[o],n[o]))return!1;a++}for(var o in n)n.hasOwnProperty(o)&&a--;return 0==a}(p.spec,f.spec):p.mode==f.mode)&&(s=f);var d=s?s.mode:p.mode||v.getMode(d,p.spec),h=s?s.state:v.startState(d);p.persistent&&!s&&(c.persistentStates={mode:d,spec:p.spec,state:h,next:c.persistentStates}),c.localState=h,c.local={mode:d,end:p.end&&k(p.end),endScan:p.end&&!1!==p.forceEnd&&k(p.end,!1),endToken:u&&u.join?u[u.length-1]:u}}i.data.indent&&t.indent.push(e.indentation()+m.indentUnit),i.data.dedent&&t.indent.pop();h=i.token;if(h&&h.apply&&(h=h(l)),2<l.length&&i.token&&"string"!=typeof i.token){for(var g=2;g<l.length;g++)l[g]&&(t.pending||(t.pending=[])).push({text:l[g],token:i.token[g-1]});return e.backUp(l[0].length-(l[1]?l[1].length:0)),h[0]}return h&&h.join?h[0]:h}}return e.next(),null}),innerMode:function(e){return e.local&&{mode:e.local.mode,state:e.localState}},indent:(c=S=a,function(e,t,n){if(e.local&&e.local.mode.indent)return e.local.mode.indent(e.localState,t,n);if(null==e.indent||e.local||p.dontIndentStates&&-1<function(e,t){for(var n=0;n<t.length;n++)if(t[n]===e)return!0}(e.state,p.dontIndentStates))return v.Pass;var a=e.indent.length-1,o=c[e.state];e:for(;;){for(var r=0;r<o.length;r++){var i=o[r];if(i.data.dedent&&!1!==i.data.dedentIfLineStart){var l=i.regex.exec(t);if(l&&l[0]){a--,(i.next||i.push)&&(o=c[i.next||i.push]),t=t.slice(l[0].length);continue e}}}break}return a<0?0:e.indent[a]})};if(p=o)for(var f in o)o.hasOwnProperty(f)&&(u[f]=o[f]);return u}});
--- a/src/myfasthtml/controls/DslEditor.py
+++ b/src/myfasthtml/controls/DslEditor.py
@@ -137,6 +137,11 @@ class DslEditor(MultipleInstance):
  
  def _get_editor_config(self) -> dict:
    """Build the JavaScript configuration object."""
+    # Get Simple Mode config if available
+    simple_mode_config = None
+    if hasattr(self._dsl, 'simple_mode_config'):
+      simple_mode_config = self._dsl.simple_mode_config
+
    config = {
        "elementId": str(self._id),
        "textareaId": f"ta_{self._id}",
@@ -150,6 +155,7 @@ class DslEditor(MultipleInstance):
        "dsl": {
            "name": self._dsl.name,
            "completions": self._dsl.completions,
+            "simpleModeConfig": simple_mode_config,
        },
    }
    return config
--- a/src/myfasthtml/core/dsl/base.py
+++ b/src/myfasthtml/core/dsl/base.py
@@ -9,10 +9,7 @@ from abc import ABC, abstractmethod
 from functools import cached_property
 from typing import List, Dict, Any

-from myfasthtml.core.dsl.lark_to_lezer import (
-  lark_to_lezer_grammar,
-  extract_completions_from_grammar,
-)
+from myfasthtml.core.dsl.lark_to_simple_mode import extract_completions_from_grammar
 from myfasthtml.core.utils import make_safe_id


@@ -39,18 +36,6 @@ class DSLDefinition(ABC):
    """
    pass
  
-  @cached_property
-  def lezer_grammar(self) -> str:
-    """
-    Return the Lezer grammar derived from the Lark grammar.
-
-    This is cached after first computation.
-
-    Returns:
-        The Lezer grammar as a string.
-    """
-    return lark_to_lezer_grammar(self.get_grammar())
-  
  @cached_property
  def completions(self) -> Dict[str, List[str]]:
    """
@@ -68,19 +53,39 @@ class DSLDefinition(ABC):
    """
    return extract_completions_from_grammar(self.get_grammar())
  
+  @cached_property
+  def simple_mode_config(self) -> Dict[str, Any]:
+    """
+    Return the CodeMirror 5 Simple Mode configuration for syntax highlighting.
+
+    This is cached after first computation.
+
+    Returns:
+        Dictionary with Simple Mode rules:
+        {
+            "start": [
+                {"regex": "...", "token": "keyword"},
+                {"regex": "...", "token": "string"},
+                ...
+            ]
+        }
+    """
+    from myfasthtml.core.dsl.lark_to_simple_mode import lark_to_simple_mode
+    return lark_to_simple_mode(self.get_grammar())
+  
  def get_editor_config(self) -> Dict[str, Any]:
    """
    Return the configuration for the DslEditor JavaScript initialization.

    Returns:
        Dictionary with:
-        - 'lezerGrammar': The Lezer grammar string
+        - 'simpleModeConfig': The CodeMirror Simple Mode configuration
        - 'completions': The completion items
        - 'name': The DSL name
    """
    return {
        "name": self.name,
-        "lezerGrammar": self.lezer_grammar,
+        "simpleModeConfig": self.simple_mode_config,
        "completions": self.completions,
    }
  
--- a/src/myfasthtml/core/dsl/lark_to_lezer.py
+++ b/src/myfasthtml/core/dsl/lark_to_lezer.py
@@ -1,256 +0,0 @@
-"""
-Utilities for converting Lark grammars to Lezer format and extracting completions.
-
-This module provides functions to:
-1. Transform a Lark grammar to a Lezer grammar for CodeMirror
-2. Extract completion items (keywords, operators, etc.) from a Lark grammar
-"""
-
-import re
-from typing import Dict, List, Set
-
-
-def lark_to_lezer_grammar(lark_grammar: str) -> str:
-  """
-  Convert a Lark grammar to a Lezer grammar.
-
-  This is a simplified converter that handles common Lark patterns.
-  Complex grammars may require manual adjustment.
-
-  Args:
-      lark_grammar: The Lark grammar string.
-
-  Returns:
-      The Lezer grammar string.
-  """
-  lines = lark_grammar.strip().split("\n")
-  lezer_rules = []
-  tokens = []
-  
-  for line in lines:
-    line = line.strip()
-    
-    # Skip empty lines and comments
-    if not line or line.startswith("//") or line.startswith("#"):
-      continue
-    
-    # Skip Lark-specific directives
-    if line.startswith("%"):
-      continue
-    
-    # Parse rule definitions (lowercase names only)
-    rule_match = re.match(r"^([a-z_][a-z0-9_]*)\s*:\s*(.+)$", line)
-    if rule_match:
-      name, body = rule_match.groups()
-      lezer_rule = _convert_rule(name, body)
-      if lezer_rule:
-        lezer_rules.append(lezer_rule)
-      continue
-    
-    # Parse terminal definitions (uppercase names)
-    terminal_match = re.match(r"^([A-Z_][A-Z0-9_]*)\s*:\s*(.+)$", line)
-    if terminal_match:
-      name, pattern = terminal_match.groups()
-      token = _convert_terminal(name, pattern)
-      if token:
-        tokens.append(token)
-  
-  # Build Lezer grammar
-  lezer_output = ["@top Start { scope+ }", ""]
-  
-  # Add rules
-  for rule in lezer_rules:
-    lezer_output.append(rule)
-  
-  lezer_output.append("")
-  lezer_output.append("@tokens {")
-  
-  # Add tokens
-  for token in tokens:
-    lezer_output.append(f"  {token}")
-  
-  # Add common tokens
-  lezer_output.extend([
-      '  whitespace { $[ \\t]+ }',
-      '  newline { $[\\n\\r] }',
-      '  Comment { "#" ![$\\n]* }',
-  ])
-  
-  lezer_output.append("}")
-  lezer_output.append("")
-  lezer_output.append("@skip { whitespace | Comment }")
-  
-  return "\n".join(lezer_output)
-
-
-def _convert_rule(name: str, body: str) -> str:
-  """Convert a single Lark rule to Lezer format."""
-  # Skip internal rules (starting with _)
-  if name.startswith("_"):
-    return ""
-  
-  # Convert rule name to PascalCase for Lezer
-  lezer_name = _to_pascal_case(name)
-  
-  # Convert body
-  lezer_body = _convert_body(body)
-  
-  if lezer_body:
-    return f"{lezer_name} {{ {lezer_body} }}"
-  return ""
-
-
-def _convert_terminal(name: str, pattern: str) -> str:
-  """Convert a Lark terminal to Lezer token format."""
-  pattern = pattern.strip()
-  
-  # Handle regex patterns
-  if pattern.startswith("/") and pattern.endswith("/"):
-    regex = pattern[1:-1]
-    # Convert to Lezer regex format
-    return f'{name} {{ ${regex}$ }}'
-  
-  # Handle string literals
-  if pattern.startswith('"') or pattern.startswith("'"):
-    return f'{name} {{ {pattern} }}'
-  
-  # Handle alternatives (literal strings separated by |)
-  if "|" in pattern:
-    alternatives = [alt.strip() for alt in pattern.split("|")]
-    if all(alt.startswith('"') or alt.startswith("'") for alt in alternatives):
-      return f'{name} {{ {" | ".join(alternatives)} }}'
-  
-  return ""
-
-
-def _convert_body(body: str) -> str:
-  """Convert the body of a Lark rule to Lezer format."""
-  # Remove inline transformations (-> name)
-  body = re.sub(r"\s*->\s*\w+", "", body)
-  
-  # Convert alternatives
-  parts = []
-  for alt in body.split("|"):
-    alt = alt.strip()
-    if alt:
-      converted = _convert_sequence(alt)
-      if converted:
-        parts.append(converted)
-  
-  return " | ".join(parts)
-
-
-def _convert_sequence(seq: str) -> str:
-  """Convert a sequence of items in a rule."""
-  items = []
-  
-  # Tokenize the sequence
-  tokens = re.findall(
-    r'"[^"]*"|\'[^\']*\'|/[^/]+/|\([^)]+\)|\[[^\]]+\]|[a-zA-Z_][a-zA-Z0-9_]*|\?|\*|\+',
-    seq
-  )
-  
-  for token in tokens:
-    if token.startswith('"') or token.startswith("'"):
-      # String literal
-      items.append(token)
-    elif token.startswith("("):
-      # Group
-      inner = token[1:-1]
-      items.append(f"({_convert_body(inner)})")
-    elif token.startswith("["):
-      # Optional group in Lark
-      inner = token[1:-1]
-      items.append(f"({_convert_body(inner)})?")
-    elif token in ("?", "*", "+"):
-      # Quantifiers - attach to previous item
-      if items:
-        items[-1] = items[-1] + token
-    elif token.isupper() or token.startswith("_"):
-      # Terminal reference
-      items.append(token)
-    elif token.islower() or "_" in token:
-      # Rule reference - convert to PascalCase
-      items.append(_to_pascal_case(token))
-  
-  return " ".join(items)
-
-
-def _to_pascal_case(name: str) -> str:
-  """Convert snake_case to PascalCase."""
-  return "".join(word.capitalize() for word in name.split("_"))
-
-
-def extract_completions_from_grammar(lark_grammar: str) -> Dict[str, List[str]]:
-  """
-  Extract completion items from a Lark grammar.
-
-  Parses the grammar to find:
-  - Keywords (reserved words like if, not, and)
-  - Operators (==, !=, contains, etc.)
-  - Functions (style, format, etc.)
-  - Types (number, date, boolean, etc.)
-  - Literals (True, False, etc.)
-
-  Args:
-      lark_grammar: The Lark grammar string.
-
-  Returns:
-      Dictionary with completion categories.
-  """
-  keywords: Set[str] = set()
-  operators: Set[str] = set()
-  functions: Set[str] = set()
-  types: Set[str] = set()
-  literals: Set[str] = set()
-  
-  # Find all quoted strings (potential keywords/operators)
-  quoted_strings = re.findall(r'"([^"]+)"', lark_grammar)
-  
-  # Also look for terminal definitions with string alternatives (e.g., BOOLEAN: "True" | "False")
-  terminal_literals = re.findall(r'[A-Z_]+:\s*"([^"]+)"(?:\s*\|\s*"([^"]+)")*', lark_grammar)
-  for match in terminal_literals:
-    for literal in match:
-      if literal:
-        quoted_strings.append(literal)
-  
-  for s in quoted_strings:
-    s_lower = s.lower()
-    
-    # Classify based on pattern
-    if s in ("==", "!=", "<=", "<", ">=", ">", "+", "-", "*", "/"):
-      operators.add(s)
-    elif s_lower in ("contains", "startswith", "endswith", "in", "between", "isempty", "isnotempty"):
-      operators.add(s_lower)
-    elif s_lower in ("if", "not", "and", "or"):
-      keywords.add(s_lower)
-    elif s_lower in ("true", "false"):
-      literals.add(s)
-    elif s_lower in ("style", "format"):
-      functions.add(s_lower)
-    elif s_lower in ("column", "row", "cell", "value", "col"):
-      keywords.add(s_lower)
-    elif s_lower in ("number", "date", "boolean", "text", "enum"):
-      types.add(s_lower)
-    elif s_lower == "case":
-      keywords.add(s_lower)
-  
-  # Find function-like patterns: word "("
-  function_patterns = re.findall(r'"(\w+)"\s*"?\("', lark_grammar)
-  for func in function_patterns:
-    if func.lower() not in ("true", "false"):
-      functions.add(func.lower())
-  
-  # Find type patterns from format_type rule
-  type_match = re.search(r'format_type\s*:\s*(.+?)(?:\n\n|\Z)', lark_grammar, re.DOTALL)
-  if type_match:
-    type_strings = re.findall(r'"(\w+)"', type_match.group(1))
-    types.update(t.lower() for t in type_strings)
-  
-  return {
-      "keywords": sorted(keywords),
-      "operators": sorted(operators),
-      "functions": sorted(functions),
-      "types": sorted(types),
-      "literals": sorted(literals),
-  }
--- a/src/myfasthtml/core/dsl/lark_to_simple_mode.py
+++ b/src/myfasthtml/core/dsl/lark_to_simple_mode.py
@@ -0,0 +1,324 @@
+"""
+Utilities for converting Lark grammars to CodeMirror 5 Simple Mode format.
+
+This module provides functions to:
+1. Extract regex patterns from Lark grammar terminals
+2. Generate CodeMirror Simple Mode configuration for syntax highlighting
+3. Extract completion items from Lark grammar (keywords, operators, etc.)
+"""
+
+import re
+from typing import Dict, List, Any, Set
+
+
+def lark_to_simple_mode(lark_grammar: str) -> Dict[str, Any]:
+    """
+    Convert a Lark grammar to CodeMirror 5 Simple Mode configuration.
+
+    Extracts terminal definitions (regex patterns) from the Lark grammar and
+    maps them to CodeMirror token classes for syntax highlighting.
+
+    Args:
+        lark_grammar: The Lark grammar string.
+
+    Returns:
+        Dictionary with Simple Mode configuration:
+        {
+            "start": [
+                {"regex": "...", "token": "keyword"},
+                {"regex": "...", "token": "string"},
+                ...
+            ]
+        }
+    """
+    # Extract keywords from literal strings in grammar rules
+    keywords = _extract_keywords(lark_grammar)
+
+    # Extract terminals (regex patterns)
+    terminals = _extract_terminals(lark_grammar)
+
+    # Build Simple Mode rules
+    rules = []
+
+    # Comments (must come first to have priority)
+    rules.append({
+        "regex": r"#.*",
+        "token": "comment"
+    })
+
+    # Keywords
+    if keywords:
+        keyword_pattern = r"\b(?:" + "|".join(re.escape(k) for k in keywords) + r")\b"
+        rules.append({
+            "regex": keyword_pattern,
+            "token": "keyword"
+        })
+
+    # Terminals mapped to token types
+    terminal_mappings = {
+        "QUOTED_STRING": "string",
+        "SIGNED_NUMBER": "number",
+        "INTEGER": "number",
+        "BOOLEAN": "atom",
+        "CELL_ID": "variable-3",
+        "NAME": "variable",
+    }
+
+    for term_name, pattern in terminals.items():
+        if term_name in terminal_mappings:
+            token_type = terminal_mappings[term_name]
+            js_pattern = _lark_regex_to_js(pattern)
+            if js_pattern:
+                rules.append({
+                    "regex": js_pattern,
+                    "token": token_type
+                })
+
+    return {"start": rules}
+
+
+def _extract_keywords(grammar: str) -> List[str]:
+    """
+    Extract keyword literals from grammar rules.
+
+    Looks for quoted string literals in rules (e.g., "column", "if", "style").
+
+    Args:
+        grammar: The Lark grammar string.
+
+    Returns:
+        List of keyword strings.
+    """
+    keywords = set()
+
+    # Match quoted literals in rules (not in terminal definitions)
+    # Pattern: "keyword" but not in lines like: TERMINAL: "pattern"
+    lines = grammar.split("\n")
+    for line in lines:
+        # Skip terminal definitions (uppercase name followed by colon)
+        if re.match(r'\s*[A-Z_]+\s*:', line):
+            continue
+
+        # Skip comments
+        if line.strip().startswith("//") or line.strip().startswith("#"):
+            continue
+
+        # Find quoted strings in rules
+        matches = re.findall(r'"([a-z_]+)"', line)
+        for match in matches:
+            # Filter out regex-like patterns, keep only identifiers
+            if re.match(r'^[a-z_]+$', match):
+                keywords.add(match)
+
+    return sorted(keywords)
+
+
+def _extract_terminals(grammar: str) -> Dict[str, str]:
+    """
+    Extract terminal definitions from Lark grammar.
+
+    Args:
+        grammar: The Lark grammar string.
+
+    Returns:
+        Dictionary mapping terminal names to their regex patterns.
+    """
+    terminals = {}
+    lines = grammar.split("\n")
+
+    for line in lines:
+        # Match terminal definitions: NAME: /regex/ or NAME: "literal"
+        match = re.match(r'\s*([A-Z_]+)\s*:\s*/([^/]+)/', line)
+        if match:
+            name, pattern = match.groups()
+            terminals[name] = pattern
+            continue
+
+        # Match literal alternatives: BOOLEAN: "True" | "False"
+        match = re.match(r'\s*([A-Z_]+)\s*:\s*(.+)', line)
+        if match:
+            name, alternatives = match.groups()
+            # Extract quoted literals
+            literals = re.findall(r'"([^"]+)"', alternatives)
+            if literals:
+                # Build regex alternation
+                pattern = "|".join(re.escape(lit) for lit in literals)
+                terminals[name] = pattern
+
+    return terminals
+
+
+def _lark_regex_to_js(lark_pattern: str) -> str:
+    """
+    Convert a Lark regex pattern to JavaScript regex.
+
+    This is a simplified converter that handles common patterns.
+    Complex patterns may need manual adjustment.
+
+    Args:
+        lark_pattern: Lark regex pattern.
+
+    Returns:
+        JavaScript regex pattern string, or empty string if conversion fails.
+    """
+    # Remove Lark-specific flags
+    pattern = lark_pattern.strip()
+
+    # Handle common patterns
+    conversions = [
+        # Escape sequences
+        (r'\[', r'['),
+        (r'\]', r']'),
+
+        # Character classes are mostly compatible
+        # Numbers: [0-9]+ or \d+
+        # Letters: [a-zA-Z]
+        # Whitespace: [ \t]
+    ]
+
+    result = pattern
+    for lark_pat, js_pat in conversions:
+        result = result.replace(lark_pat, js_pat)
+
+    # Wrap in word boundaries for identifier-like patterns
+    # Example: [a-zA-Z_][a-zA-Z0-9_]* → \b[a-zA-Z_][a-zA-Z0-9_]*\b
+    if re.match(r'\[[a-zA-Z_]+\]', result):
+        result = r'\b' + result + r'\b'
+
+    return result
+
+
+def generate_formatting_dsl_mode() -> Dict[str, Any]:
+    """
+    Generate Simple Mode configuration for the Formatting DSL.
+
+    This is a specialized version with hand-tuned rules for better highlighting.
+
+    Returns:
+        Simple Mode configuration dictionary.
+    """
+    return {
+        "start": [
+            # Comments (highest priority)
+            {"regex": r"#.*", "token": "comment"},
+
+            # Scope keywords
+            {"regex": r"\b(?:column|row|cell)\b", "token": "keyword"},
+
+            # Condition keywords
+            {"regex": r"\b(?:if|not|and|or|in|between|case)\b", "token": "keyword"},
+
+            # Built-in functions
+            {"regex": r"\b(?:style|format)\b", "token": "builtin"},
+
+            # Format types
+            {"regex": r"\b(?:number|date|boolean|text|enum)\b", "token": "builtin"},
+
+            # String operators (word-like)
+            {"regex": r"\b(?:contains|startswith|endswith|isempty|isnotempty)\b", "token": "operator"},
+
+            # Comparison operators (symbols)
+            {"regex": r"==|!=|<=|>=|<|>", "token": "operator"},
+
+            # Special references
+            {"regex": r"\b(?:value|col|row|cell)\b", "token": "variable-2"},
+
+            # Booleans
+            {"regex": r"\b(?:True|False|true|false)\b", "token": "atom"},
+
+            # Numbers (integers and floats, with optional sign)
+            {"regex": r"[+-]?\b\d+(?:\.\d+)?\b", "token": "number"},
+
+            # Strings (double or single quoted)
+            {"regex": r'"(?:[^\\"]|\\.)*"', "token": "string"},
+            {"regex": r"'(?:[^\\']|\\.)*'", "token": "string"},
+
+            # Cell IDs
+            {"regex": r"\btcell_[a-zA-Z0-9_-]+\b", "token": "variable-3"},
+
+            # Names (identifiers) - lowest priority
+            {"regex": r"\b[a-zA-Z_][a-zA-Z0-9_]*\b", "token": "variable"},
+        ]
+    }
+
+
+def extract_completions_from_grammar(lark_grammar: str) -> Dict[str, List[str]]:
+    """
+    Extract completion items from a Lark grammar.
+
+    Parses the grammar to find:
+    - Keywords (reserved words like if, not, and)
+    - Operators (==, !=, contains, etc.)
+    - Functions (style, format, etc.)
+    - Types (number, date, boolean, etc.)
+    - Literals (True, False, etc.)
+
+    Args:
+        lark_grammar: The Lark grammar string.
+
+    Returns:
+        Dictionary with completion categories:
+        {
+            "keywords": [...],
+            "operators": [...],
+            "functions": [...],
+            "types": [...],
+            "literals": [...]
+        }
+    """
+    keywords: Set[str] = set()
+    operators: Set[str] = set()
+    functions: Set[str] = set()
+    types: Set[str] = set()
+    literals: Set[str] = set()
+
+    # Find all quoted strings (potential keywords/operators)
+    quoted_strings = re.findall(r'"([^"]+)"', lark_grammar)
+
+    # Also look for terminal definitions with string alternatives (e.g., BOOLEAN: "True" | "False")
+    terminal_literals = re.findall(r'[A-Z_]+:\s*"([^"]+)"(?:\s*\|\s*"([^"]+)")*', lark_grammar)
+    for match in terminal_literals:
+        for literal in match:
+            if literal:
+                quoted_strings.append(literal)
+
+    for s in quoted_strings:
+        s_lower = s.lower()
+
+        # Classify based on pattern
+        if s in ("==", "!=", "<=", "<", ">=", ">", "+", "-", "*", "/"):
+            operators.add(s)
+        elif s_lower in ("contains", "startswith", "endswith", "in", "between", "isempty", "isnotempty"):
+            operators.add(s_lower)
+        elif s_lower in ("if", "not", "and", "or"):
+            keywords.add(s_lower)
+        elif s_lower in ("true", "false"):
+            literals.add(s)
+        elif s_lower in ("style", "format"):
+            functions.add(s_lower)
+        elif s_lower in ("column", "row", "cell", "value", "col"):
+            keywords.add(s_lower)
+        elif s_lower in ("number", "date", "boolean", "text", "enum"):
+            types.add(s_lower)
+        elif s_lower == "case":
+            keywords.add(s_lower)
+
+    # Find function-like patterns: word "("
+    function_patterns = re.findall(r'"(\w+)"\s*"?\("', lark_grammar)
+    for func in function_patterns:
+        if func.lower() not in ("true", "false"):
+            functions.add(func.lower())
+
+    # Find type patterns from format_type rule
+    type_match = re.search(r'format_type\s*:\s*(.+?)(?:\n\n|\Z)', lark_grammar, re.DOTALL)
+    if type_match:
+        type_strings = re.findall(r'"(\w+)"', type_match.group(1))
+        types.update(t.lower() for t in type_strings)
+
+    return {
+        "keywords": sorted(keywords),
+        "operators": sorted(operators),
+        "functions": sorted(functions),
+        "types": sorted(types),
+        "literals": sorted(literals),
+    }
--- a/src/myfasthtml/core/formatting/dsl/completion/suggestions.py
+++ b/src/myfasthtml/core/formatting/dsl/completion/suggestions.py
@@ -283,9 +283,11 @@ def _get_column_value_suggestions(
  """Get column value suggestions based on the current scope."""
  if not scope.column_name:
    return []
-  
+
  try:
-    values = provider.list_column_values(scope.column_name)
+    # Use table_name from scope, or empty string as fallback
+    table_name = scope.table_name or ""
+    values = provider.list_column_values(table_name, scope.column_name)
    suggestions = []
    for value in values:
      if value is None:
--- a/src/myfasthtml/core/formatting/dsl/definition.py
+++ b/src/myfasthtml/core/formatting/dsl/definition.py
@@ -5,6 +5,9 @@ Provides the Lark grammar and derived completions for the
 DataGrid Formatting DSL.
 """

+from functools import cached_property
+from typing import Dict, Any
+
 from myfasthtml.core.dsl.base import DSLDefinition
 from myfasthtml.core.formatting.dsl.grammar import GRAMMAR

@@ -15,9 +18,20 @@ class FormattingDSL(DSLDefinition):

  Uses the existing Lark grammar from grammar.py.
  """
-  
+
  name: str = "Formatting DSL"
-  
+
  def get_grammar(self) -> str:
    """Return the Lark grammar for formatting DSL."""
    return GRAMMAR
+
+  @cached_property
+  def simple_mode_config(self) -> Dict[str, Any]:
+    """
+    Return hand-tuned Simple Mode configuration for optimal highlighting.
+
+    Overrides the base class to use a specialized configuration
+    rather than auto-generated one.
+    """
+    from myfasthtml.core.dsl.lark_to_simple_mode import generate_formatting_dsl_mode
+    return generate_formatting_dsl_mode()
--- a/src/myfasthtml/examples/dsl_syntax.py
+++ b/src/myfasthtml/examples/dsl_syntax.py
@@ -0,0 +1,125 @@
+"""
+Test page for DSL syntax highlighting with DaisyUI theme.
+"""
+
+from fasthtml.common import *
+from myfasthtml.myfastapp import create_app
+from myfasthtml.controls.DslEditor import DslEditor, DslEditorConf
+from myfasthtml.core.formatting.dsl.definition import FormattingDSL
+from myfasthtml.core.instances import RootInstance
+
+# Create app
+app, rt = create_app(protect_routes=False)
+
+# Sample DSL content
+SAMPLE_DSL = """# DataGrid Formatting Example
+
+column amount:
+    format.number(precision=2, suffix=" €", thousands_sep=" ")
+    style("error") if value < 0
+    style("success", bold=True) if value > 10000
+
+column status:
+    format.enum(source={"draft": "Draft", "pending": "Pending", "approved": "Approved"})
+    style("neutral") if value == "draft"
+    style("warning") if value == "pending"
+    style("success") if value == "approved"
+
+column progress:
+    format("percentage")
+    style("error") if value < 0.5
+    style("warning") if value between 0.5 and 0.8
+    style("success") if value > 0.8
+
+row 0:
+    style("neutral", bold=True)
+
+cell (amount, 10):
+    style("accent", bold=True)
+"""
+
+
+@rt("/")
+def get():
+    root = RootInstance
+    formatting_dsl = FormattingDSL()
+
+    editor = DslEditor(
+        root,
+        formatting_dsl,
+        DslEditorConf(
+            name="test_editor",
+            line_numbers=True,
+            autocompletion=True,
+            linting=True,
+            placeholder="Type your DSL code here..."
+        ),
+        save_state=False
+    )
+
+    editor.set_content(SAMPLE_DSL)
+
+    return Titled(
+        "DSL Syntax Highlighting Test",
+        Div(
+            H1("Formatting DSL Editor", cls="text-3xl font-bold mb-4"),
+            P("This editor demonstrates:", cls="mb-2"),
+            Ul(
+                Li("✅ DaisyUI theme integration (adapts to dark mode)"),
+                Li("✅ Syntax highlighting with CodeMirror Simple Mode"),
+                Li("✅ Server-side validation (try adding syntax errors)"),
+                Li("✅ Server-side autocompletion (Ctrl+Space)"),
+                cls="list-disc list-inside mb-4 space-y-1"
+            ),
+            Div(
+                editor,
+                cls="border border-base-300 rounded-lg p-4"
+            ),
+            Div(
+                P("Theme:", cls="font-bold mb-2"),
+                Select(
+                    Option("light", value="light"),
+                    Option("dark", value="dark"),
+                    Option("cupcake", value="cupcake"),
+                    Option("bumblebee", value="bumblebee"),
+                    Option("emerald", value="emerald"),
+                    Option("corporate", value="corporate"),
+                    Option("synthwave", value="synthwave"),
+                    Option("retro", value="retro"),
+                    Option("cyberpunk", value="cyberpunk"),
+                    Option("valentine", value="valentine"),
+                    Option("halloween", value="halloween"),
+                    Option("garden", value="garden"),
+                    Option("forest", value="forest"),
+                    Option("aqua", value="aqua"),
+                    Option("lofi", value="lofi"),
+                    Option("pastel", value="pastel"),
+                    Option("fantasy", value="fantasy"),
+                    Option("wireframe", value="wireframe"),
+                    Option("black", value="black"),
+                    Option("luxury", value="luxury"),
+                    Option("dracula", value="dracula"),
+                    Option("cmyk", value="cmyk"),
+                    Option("autumn", value="autumn"),
+                    Option("business", value="business"),
+                    Option("acid", value="acid"),
+                    Option("lemonade", value="lemonade"),
+                    Option("night", value="night"),
+                    Option("coffee", value="coffee"),
+                    Option("winter", value="winter"),
+                    Option("dim", value="dim"),
+                    Option("nord", value="nord"),
+                    Option("sunset", value="sunset"),
+                    cls="select select-bordered",
+                    onchange="document.documentElement.setAttribute('data-theme', this.value)"
+                ),
+                cls="mt-4"
+            ),
+            cls="container mx-auto p-8"
+        )
+    )
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=5010)
--- a/src/myfasthtml/myfastapp.py
+++ b/src/myfasthtml/myfastapp.py
@@ -82,12 +82,13 @@ def create_app(daisyui: Optional[bool] = True,
    hdrs += [
        Script(src="/myfasthtml/codemirror.min.js"),
        Link(href="/myfasthtml/codemirror.min.css", rel="stylesheet", type="text/css"),
-        
+
        Script(src="/myfasthtml/placeholder.min.js"),
-        
+        Script(src="/myfasthtml/simple.min.js"),
+
        Script(src="/myfasthtml/show-hint.min.js"),
        Link(href="/myfasthtml/show-hint.min.css", rel="stylesheet", type="text/css"),
-        
+
        Script(src="/myfasthtml/lint.min.js"),
        Link(href="/myfasthtml/lint.min.css", rel="stylesheet", type="text/css"),
    ]
--- a/tests/core/dsl/test_lark_to_lezer.py
+++ b/tests/core/dsl/test_lark_to_lezer.py
@@ -1,172 +0,0 @@
-"""Tests for lark_to_lezer module."""
-
-import pytest
-
-from myfasthtml.core.dsl.lark_to_lezer import (
-  extract_completions_from_grammar,
-  lark_to_lezer_grammar,
-)
-
-# Sample grammars for testing
-SIMPLE_GRAMMAR = r'''
-    start: rule+
-    rule: "if" condition
-    condition: "value" operator literal
-    operator: "==" -> op_eq
-           | "!=" -> op_ne
-           | "contains" -> op_contains
-    literal: QUOTED_STRING -> string_literal
-          | BOOLEAN -> boolean_literal
-    QUOTED_STRING: /"[^"]*"/
-    BOOLEAN: "True" | "False"
-'''
-
-GRAMMAR_WITH_KEYWORDS = r'''
-    start: scope+
-    scope: "column" NAME ":" rule
-        | "row" INTEGER ":" rule
-        | "cell" cell_ref ":" rule
-    rule: style_expr condition?
-    condition: "if" "not"? comparison
-    comparison: operand "and" operand
-             | operand "or" operand
-    style_expr: "style" "(" args ")"
-    operand: "value" | literal
-'''
-
-GRAMMAR_WITH_TYPES = r'''
-    format_type: "number" -> fmt_number
-              | "date" -> fmt_date
-              | "boolean" -> fmt_boolean
-              | "text" -> fmt_text
-              | "enum" -> fmt_enum
-'''
-
-
-class TestExtractCompletions:
-  """Tests for extract_completions_from_grammar function."""
-  
-  def test_i_can_extract_keywords_from_grammar(self):
-    """Test that keywords like if, not, and are extracted."""
-    completions = extract_completions_from_grammar(GRAMMAR_WITH_KEYWORDS)
-    
-    assert "if" in completions["keywords"]
-    assert "not" in completions["keywords"]
-    assert "column" in completions["keywords"]
-    assert "row" in completions["keywords"]
-    assert "cell" in completions["keywords"]
-    assert "value" in completions["keywords"]
-  
-  @pytest.mark.parametrize(
-    "operator",
-    ["==", "!=", "contains"],
-  )
-  def test_i_can_extract_operators_from_grammar(self, operator):
-    """Test that operators are extracted from grammar."""
-    completions = extract_completions_from_grammar(SIMPLE_GRAMMAR)
-    
-    assert operator in completions["operators"]
-  
-  def test_i_can_extract_functions_from_grammar(self):
-    """Test that function-like constructs are extracted."""
-    completions = extract_completions_from_grammar(GRAMMAR_WITH_KEYWORDS)
-    
-    assert "style" in completions["functions"]
-  
-  @pytest.mark.parametrize(
-    "type_name",
-    ["number", "date", "boolean", "text", "enum"],
-  )
-  def test_i_can_extract_types_from_grammar(self, type_name):
-    """Test that type names are extracted from format_type rule."""
-    completions = extract_completions_from_grammar(GRAMMAR_WITH_TYPES)
-    
-    assert type_name in completions["types"]
-  
-  @pytest.mark.parametrize("literal", [
-      "True",
-      "False"
-  ])
-  def test_i_can_extract_literals_from_grammar(self, literal):
-    """Test that literal values like True/False are extracted."""
-    completions = extract_completions_from_grammar(SIMPLE_GRAMMAR)
-    
-    assert literal in completions["literals"]
-  
-  def test_i_can_extract_completions_returns_all_categories(self):
-    """Test that all completion categories are present in result."""
-    completions = extract_completions_from_grammar(SIMPLE_GRAMMAR)
-    
-    assert "keywords" in completions
-    assert "operators" in completions
-    assert "functions" in completions
-    assert "types" in completions
-    assert "literals" in completions
-  
-  def test_i_can_extract_completions_returns_sorted_lists(self):
-    """Test that completion lists are sorted alphabetically."""
-    completions = extract_completions_from_grammar(SIMPLE_GRAMMAR)
-    
-    for category in completions.values():
-      assert category == sorted(category)
-
-
-class TestLarkToLezerConversion:
-  """Tests for lark_to_lezer_grammar function."""
-  
-  def test_i_can_convert_simple_grammar_to_lezer(self):
-    """Test that a simple Lark grammar is converted to Lezer format."""
-    lezer = lark_to_lezer_grammar(SIMPLE_GRAMMAR)
-    
-    # Should have @top directive
-    assert "@top Start" in lezer
-    # Should have @tokens block
-    assert "@tokens {" in lezer
-    # Should have @skip directive
-    assert "@skip {" in lezer
-  
-  def test_i_can_convert_rule_names_to_pascal_case(self):
-    """Test that snake_case rule names become PascalCase."""
-    grammar = r'''
-            my_rule: other_rule
-            other_rule: "test"
-        '''
-    lezer = lark_to_lezer_grammar(grammar)
-    
-    assert "MyRule" in lezer
-    assert "OtherRule" in lezer
-  
-  def test_i_cannot_include_internal_rules_in_lezer(self):
-    """Test that rules starting with _ are not included."""
-    grammar = r'''
-            start: rule _NL
-            rule: "test"
-            _NL: /\n/
-        '''
-    lezer = lark_to_lezer_grammar(grammar)
-    
-    # Internal rules should not appear as Lezer rules
-    assert "Nl {" not in lezer
-  
-  def test_i_can_convert_terminal_regex_to_lezer(self):
-    """Test that terminal regex patterns are converted."""
-    grammar = r'''
-            NAME: /[a-zA-Z_][a-zA-Z0-9_]*/
-        '''
-    lezer = lark_to_lezer_grammar(grammar)
-    
-    assert "NAME" in lezer
-  
-  @pytest.mark.parametrize(
-    "terminal,pattern",
-    [
-        ('BOOLEAN: "True" | "False"', "BOOLEAN"),
-        ('KEYWORD: "if"', "KEYWORD"),
-    ],
-  )
-  def test_i_can_convert_terminal_strings_to_lezer(self, terminal, pattern):
-    """Test that terminal string literals are converted."""
-    grammar = f"start: test\n{terminal}"
-    lezer = lark_to_lezer_grammar(grammar)
-    
-    assert pattern in lezer
--- a/tests/core/formatting/dsl/test_completion.py
+++ b/tests/core/formatting/dsl/test_completion.py
@@ -34,13 +34,13 @@ class MockProvider:
    Provides predefined data for columns, values, and presets.
    """

-    def get_tables(self) -> list[str]:
+    def list_tables(self) -> list[str]:
        return ["app.orders"]

-    def get_columns(self, table: str) -> list[str]:
+    def list_columns(self, table: str) -> list[str]:
        return ["id", "amount", "status"]

-    def get_column_values(self, column: str) -> list[Any]:
+    def list_column_values(self, table: str, column: str) -> list[Any]:
        if column == "status":
            return ["draft", "pending", "approved"]
        if column == "amount":
@@ -50,10 +50,10 @@ class MockProvider:
    def get_row_count(self, table: str) -> int:
        return 150

-    def get_style_presets(self) -> list[str]:
+    def list_style_presets(self) -> list[str]:
        return ["custom_highlight"]

-    def get_format_presets(self) -> list[str]:
+    def list_format_presets(self) -> list[str]:
        return ["CHF"]


--- a/tests/core/formatting/test_formatting_dsl_definition.py
+++ b/tests/core/formatting/test_formatting_dsl_definition.py
@@ -84,14 +84,14 @@ class TestFormattingDSL:

        assert completions1 is completions2

-    def test_i_can_get_lezer_grammar_is_cached(self):
-        """Test that lezer_grammar property is cached (same object returned)."""
+    def test_i_can_get_simple_mode_config_is_cached(self):
+        """Test that simple_mode_config property is cached (same object returned)."""
        dsl = FormattingDSL()

-        lezer1 = dsl.lezer_grammar
-        lezer2 = dsl.lezer_grammar
+        config1 = dsl.simple_mode_config
+        config2 = dsl.simple_mode_config

-        assert lezer1 is lezer2
+        assert config1 is config2

    def test_i_can_get_editor_config(self):
        """Test that get_editor_config() returns expected structure."""
@@ -100,6 +100,7 @@ class TestFormattingDSL:
        config = dsl.get_editor_config()

        assert "name" in config
-        assert "lezerGrammar" in config
+        assert "simpleModeConfig" in config
        assert "completions" in config
        assert config["name"] == "Formatting DSL"
+        assert "start" in config["simpleModeConfig"]  # Simple Mode structure
Author	SHA1	Message	Date
Kodjo Sossouvi	ab4f251f0c	Added syntax colorization. Remove all references to deprecated lark_to_lezer module.	2026-02-07 11:08:34 +01:00
Kodjo Sossouvi	1c1ced2a9f	Added syntax colorization	2026-02-07 10:52:40 +01:00
				`@@ -0,0 +1 @@`
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