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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Style Validator - Construct 3 UI</title>
<script>
// Inside the docs shell (index.html embeds this page in an iframe) the
// standalone chrome is hidden and the page blends with the docs theme.
if (window.self !== window.top) {
document.documentElement.classList.add("embedded");
}
</script>
<link
rel="icon"
type="image/png"
href="./favicon-96x96.png"
sizes="96x96"
/>
<link rel="icon" type="image/svg+xml" href="./favicon.svg" />
<link rel="shortcut icon" href="./favicon.ico" />
<link
rel="apple-touch-icon"
sizes="180x180"
href="./apple-touch-icon.png"
/>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
"Helvetica Neue", Arial, sans-serif;
line-height: 1.6;
color: #24292e;
background-color: #fafafa;
padding: 20px;
}
.container {
max-width: 880px;
margin: 0 auto;
background: white;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
overflow: hidden;
}
.header {
background: #f6f8fa;
padding: 20px;
border-bottom: 1px solid #e1e4e8;
position: relative;
}
.back-button {
position: absolute;
top: 20px;
left: 20px;
background: transparent;
color: black;
border: none;
outline: none;
padding: 0px 4px;
border-radius: 6px;
cursor: pointer;
font-size: 24px;
transition: background 0.2s ease;
display: flex;
align-items: center;
gap: 6px;
text-decoration: none;
width: 32px;
height: 32px;
justify-content: center;
}
.back-button:hover {
background: rgba(0, 0, 0, 0.1);
}
.back-button:focus {
outline: none;
}
.back-arrow {
font-size: 18px;
}
.header h1 {
font-size: 1.5rem;
font-weight: 600;
margin-bottom: 8px;
margin-left: 48px; /* Add space for back button */
}
.header p {
color: #586069;
margin: 0;
margin-left: 48px; /* Add space for back button */
}
.validator-section {
padding: 20px;
}
.input-section {
margin-bottom: 20px;
}
.input-label {
display: block;
font-weight: 600;
margin-bottom: 8px;
color: #24292e;
}
.textarea-container {
position: relative;
}
.css-input {
width: 100%;
height: 300px;
border: 2px solid #e1e4e8;
border-radius: 6px;
padding: 12px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
font-size: 14px;
line-height: 1.4;
resize: vertical;
background: #fafbfc;
transition: border-color 0.2s ease;
}
.css-input:focus {
outline: none;
border-color: #0366d6;
background: white;
}
.css-input.has-errors {
border-color: #d73a49;
}
.css-input.has-warnings {
border-color: #f66a0a;
}
.line-numbers {
position: absolute;
left: 0;
top: 0;
bottom: 0;
width: 40px;
background: #f6f8fa;
border-right: 1px solid #e1e4e8;
padding: 12px 8px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
font-size: 14px;
line-height: 1.4;
color: #586069;
user-select: none;
pointer-events: none;
overflow: hidden;
}
.controls {
display: flex;
gap: 12px;
align-items: center;
margin-bottom: 20px;
}
.validate-btn {
background: #28a745;
color: white;
border: none;
padding: 10px 20px;
border-radius: 6px;
cursor: pointer;
font-size: 14px;
font-weight: 500;
transition: background 0.2s ease;
}
.validate-btn:hover {
background: #218838;
}
.validate-btn:disabled {
background: #6c757d;
cursor: not-allowed;
}
.clear-btn {
background: #6c757d;
color: white;
border: none;
padding: 10px 20px;
border-radius: 6px;
cursor: pointer;
font-size: 14px;
font-weight: 500;
transition: background 0.2s ease;
}
.clear-btn:hover {
background: #5a6268;
}
.auto-validate {
display: flex;
align-items: center;
gap: 6px;
margin-left: auto;
}
.auto-validate input[type="checkbox"] {
margin: 0;
}
.auto-validate label {
font-size: 14px;
cursor: pointer;
margin: 0;
}
.results-section {
border-top: 1px solid #e1e4e8;
background: #fafbfc;
}
.results-header {
padding: 16px 20px;
background: #f6f8fa;
border-bottom: 1px solid #e1e4e8;
display: flex;
justify-content: space-between;
align-items: center;
}
.results-title {
font-weight: 600;
font-size: 16px;
}
.summary-stats {
display: flex;
gap: 16px;
font-size: 14px;
}
.stat {
display: flex;
align-items: center;
gap: 4px;
}
.stat-icon {
width: 12px;
height: 12px;
border-radius: 50%;
}
.stat-icon.success {
background: #28a745;
}
.stat-icon.error {
background: #d73a49;
}
.stat-icon.warning {
background: #f66a0a;
}
.results-content {
padding: 20px;
}
.validation-result {
border-radius: 6px;
padding: 16px;
margin-bottom: 16px;
font-size: 14px;
}
.validation-success {
background: #d4edda;
border: 1px solid #c3e6cb;
color: #155724;
}
.validation-error {
background: #f8d7da;
border: 1px solid #f5c6cb;
color: #721c24;
}
.validation-warning {
background: #fff3cd;
border: 1px solid #ffeaa7;
color: #856404;
}
.error-list {
margin-top: 16px;
}
.error-item {
background: white;
border: 1px solid #e1e4e8;
border-radius: 6px;
padding: 12px;
margin-bottom: 8px;
position: relative;
}
.error-item.error {
border-left: 4px solid #d73a49;
}
.error-item.warning {
border-left: 4px solid #f66a0a;
}
.error-header {
display: flex;
justify-content: between;
align-items: flex-start;
gap: 12px;
margin-bottom: 8px;
}
.error-type {
background: #f6f8fa;
color: #586069;
padding: 2px 6px;
border-radius: 3px;
font-size: 12px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
}
.error-position {
font-size: 12px;
color: #586069;
margin-left: auto;
}
.error-message {
color: #24292e;
margin-bottom: 8px;
}
.error-context {
background: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 3px;
padding: 8px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
font-size: 12px;
white-space: pre-wrap;
}
.error-highlight {
background: #ffebee;
color: #d32f2f;
padding: 0 2px;
border-radius: 2px;
}
.suggestions {
margin-top: 8px;
}
.suggestions-label {
font-size: 12px;
color: #586069;
margin-bottom: 4px;
}
.suggestion-item {
display: inline-block;
background: #e1f5ff;
color: #0366d6;
padding: 2px 6px;
border-radius: 3px;
font-size: 12px;
margin-right: 6px;
}
.parsed-output {
background: white;
border: 1px solid #e1e4e8;
border-radius: 6px;
margin-top: 16px;
}
.parsed-output-header {
background: #f6f8fa;
padding: 12px 16px;
border-bottom: 1px solid #e1e4e8;
font-weight: 600;
}
.parsed-output-content {
padding: 16px;
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
font-size: 13px;
white-space: pre-wrap;
max-height: 300px;
overflow-y: auto;
}
.tabs {
display: flex;
border-bottom: 1px solid #e1e4e8;
}
.tab {
padding: 12px 16px;
background: none;
border: none;
cursor: pointer;
font-size: 14px;
color: #586069;
transition: color 0.2s ease;
}
.tab.active {
color: #0366d6;
border-bottom: 2px solid #0366d6;
}
.tab:hover {
color: #24292e;
}
.tab-content {
display: none;
padding: 20px;
}
.tab-content.active {
display: block;
}
.example-section {
background: #f6f8fa;
border: 1px solid #e1e4e8;
border-radius: 6px;
padding: 16px;
margin-top: 20px;
}
.example-header {
font-weight: 600;
margin-bottom: 12px;
color: #24292e;
}
.example-item {
margin-bottom: 8px;
padding: 8px;
background: white;
border-radius: 3px;
cursor: pointer;
transition: background 0.2s ease;
}
.example-item:hover {
background: #f0f0f0;
}
.example-label {
font-weight: 500;
color: #0366d6;
font-size: 13px;
}
.example-code {
font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
monospace;
font-size: 12px;
color: #586069;
margin-top: 2px;
}
/* Embedded in the docs shell: no page padding, no card, no back button */
.embedded body {
padding: 0;
background-color: #ffffff;
overflow: hidden; /* the docs shell scrolls; no inner scrollbar */
}
.embedded .container {
max-width: none;
border-radius: 0;
box-shadow: none;
}
.embedded .back-button {
display: none;
}
.embedded .header h1,
.embedded .header p {
margin-left: 0;
}
/* Responsive design for back button */
@media (max-width: 768px) {
.back-button {
position: static;
margin-bottom: 16px;
}
.header h1 {
margin-left: 0;
}
.header p {
margin-left: 0;
}
}
</style>
</head>
<body>
<div class="container">
<div class="header">
<button class="back-button" onclick="goBack()">
<span class="back-arrow">←</span>
</button>
<h1>Style Validator</h1>
<p>
Check a style string against the properties and values the Construct 3
UI layout engine actually supports, with error reporting and suggestions.
</p>
</div>
<div class="validator-section">
<div class="input-section">
<label for="cssInput" class="input-label">CSS Properties</label>
<div class="textarea-container">
<textarea
id="cssInput"
class="css-input"
placeholder="display: column;
gap: 10;
align-items: center;
flex-grow: 1;
width: 100%;
margin: 10;"
></textarea>
</div>
</div>
<div class="controls">
<button class="validate-btn" onclick="validateStyles()">
Validate CSS
</button>
<button class="clear-btn" onclick="clearInput()">Clear</button>
<div class="auto-validate">
<input
type="checkbox"
id="autoValidate"
onchange="toggleAutoValidate()"
/>
<label for="autoValidate">Auto-validate</label>
</div>
</div>
</div>
<div class="results-section" id="resultsSection" style="display: none">
<div class="tabs">
<button class="tab active" onclick="showTab('overview', this)">
Overview
</button>
<button class="tab" onclick="showTab('errors', this)">
Errors & Warnings
</button>
<button class="tab" onclick="showTab('output', this)">Parsed Output</button>
</div>
<div id="overview-tab" class="tab-content active">
<div class="results-header">
<div class="results-title">Validation Results</div>
<div class="summary-stats" id="summaryStats">
<!-- Summary stats will be populated here -->
</div>
</div>
<div class="results-content">
<div id="validationResult">
<!-- Main validation result will be shown here -->
</div>
</div>
</div>
<div id="errors-tab" class="tab-content">
<div class="results-content">
<div id="errorsList">
<!-- Detailed errors list will be shown here -->
</div>
</div>
</div>
<div id="output-tab" class="tab-content">
<div class="parsed-output">
<div class="parsed-output-header">Computed Style Object</div>
<div class="parsed-output-content" id="parsedOutput">
<!-- Parsed output will be shown here -->
</div>
</div>
</div>
</div>
<div class="example-section">
<div class="example-header">Quick Examples</div>
<div class="example-item" onclick="loadExample('basic')">
<div class="example-label">Basic Layout</div>
<div class="example-code">
display: column; gap: 10; align-items: center;
</div>
</div>
<div class="example-item" onclick="loadExample('flex')">
<div class="example-label">Flex Layout</div>
<div class="example-code">
display: row; flex-grow: 1; flex-shrink: 0; flex-basis: auto;
</div>
</div>
<div class="example-item" onclick="loadExample('positioning')">
<div class="example-label">Absolute Positioning</div>
<div class="example-code">
position: absolute; top: 10; left: 20; width: 200; height: 100;
</div>
</div>
<div class="example-item" onclick="loadExample('anchor')">
<div class="example-label">Anchor Positioning</div>
<div class="example-code">
position: anchor; anchor-target: parent; anchor-point: center;
self-anchor: top;
</div>
</div>
<div class="example-item" onclick="loadExample('boxmodel')">
<div class="example-label">Box Model</div>
<div class="example-code">
margin: 10; padding: 15; border: 2; margin-top: 0;
</div>
</div>
<div class="example-item" onclick="loadExample('fitcontent')">
<div class="example-label">Fit Content</div>
<div class="example-code">
display: row; fit-content: true; gap: 8; padding: 12;
</div>
</div>
<div class="example-item" onclick="loadExample('errors')">
<div class="example-label">Common Errors</div>
<div class="example-code">
display: invalid; gap: -5; unknown-property: value;
</div>
</div>
</div>
</div>
<!-- Include the CSSPropertyValidator class -->
<script>
// Insert the CSSPropertyValidator class code here
/**
* CSS Property Validator for Construct 3 Flexbox Layout Engine
* Validates individual properties and their values with detailed error reporting
*/
// Every name getAnchorPoint() in the layout engine understands.
// top = top-center, left = center-left, right = center-right,
// bottom = bottom-center.
const ANCHOR_POINTS = [
"top-left",
"top",
"top-center",
"top-right",
"left",
"center-left",
"center",
"right",
"center-right",
"bottom-left",
"bottom",
"bottom-center",
"bottom-right",
];
class CSSPropertyValidator {
constructor() {
// Define validation rules for each property
this.propertyRules = {
// ---- Container layout ----
display: {
type: "enum",
values: ["column", "row", "column-reverse", "row-reverse", "grid"],
default: "column",
},
"flex-wrap": {
type: "enum",
values: ["nowrap", "wrap", "wrap-reverse"],
default: "nowrap",
},
gap: {
type: "number",
min: 0,
default: 0,
},
columns: {
type: "number",
min: 1,
default: 2,
description: "Number of columns for display: grid.",
},
"align-items": {
type: "enum",
values: ["start", "center", "end"],
default: "start",
},
"justify-content": {
type: "enum",
values: ["start", "center", "end", "space-between", "space-around"],
default: "start",
},
"align-content": {
type: "enum",
values: ["start", "center", "end", "space-between", "space-around", "stretch"],
default: "start",
description: "Places the lines of a wrapped container on the cross axis.",
},
"fit-content": {
type: "enum",
values: ["true", "false", "x", "y"],
default: "false",
description: "Size the container to its children, on both axes or one.",
},
// ---- Child sizing in a flex container ----
flex: {
type: "flex-shorthand",
default: "0 1 auto",
},
"flex-grow": {
type: "number",
min: 0,
default: 0,
},
"flex-shrink": {
type: "number",
min: 0,
default: 1,
},
"flex-basis": {
type: "flex-basis",
default: "auto",
},
"align-self": {
type: "enum",
values: ["start", "center", "end"],
default: "(inherits align-items)",
},
"justify-self": {
type: "enum",
values: ["start", "center", "end"],
default: "start",
description: "Only used by display: grid.",
},
// ---- Size ----
width: {
type: "size",
min: 0,
default: "(instance size)",
},
height: {
type: "size",
min: 0,
default: "(instance size)",
},
"min-width": {
type: "number",
min: 0,
default: "none",
},
"max-width": {
type: "number",
min: 0,
default: "none",
},
"min-height": {
type: "number",
min: 0,
default: "none",
},
"max-height": {
type: "number",
min: 0,
default: "none",
},
// ---- Box model (CSS 1-4 value shorthands, expanded to the per-side longhands) ----
margin: {
type: "box",
default: 0,
description: "1 to 4 numbers: all | vertical horizontal | top horizontal bottom | top right bottom left. Negative values allowed.",
},
"margin-top": { type: "number", default: 0 },
"margin-right": { type: "number", default: 0 },
"margin-bottom": { type: "number", default: 0 },
"margin-left": { type: "number", default: 0 },
padding: {
type: "box",
min: 0,
default: 0,
description: "1 to 4 numbers: all | vertical horizontal | top horizontal bottom | top right bottom left.",
},
"padding-top": { type: "number", min: 0, default: 0 },
"padding-right": { type: "number", min: 0, default: 0 },
"padding-bottom": { type: "number", min: 0, default: 0 },
"padding-left": { type: "number", min: 0, default: 0 },
border: {
type: "box",
min: 0,
default: 0,
description: "Same as border-width: 1 to 4 numbers.",
warning:
"Border only reserves space inside the element; it does not draw anything",
},
"border-width": {
type: "box",
min: 0,
default: 0,
description: "1 to 4 numbers: all | vertical horizontal | top horizontal bottom | top right bottom left.",
warning:
"Border only reserves space inside the element; it does not draw anything",
},
"border-top-width": { type: "number", min: 0, default: 0 },
"border-right-width": { type: "number", min: 0, default: 0 },
"border-bottom-width": { type: "number", min: 0, default: 0 },
"border-left-width": { type: "number", min: 0, default: 0 },
// ---- Positioning ----
position: {
type: "enum",
values: ["relative", "absolute", "anchor"],
default: "relative",
},
top: { type: "number", default: "(unset)" },
right: { type: "number", default: "(unset)" },
bottom: { type: "number", default: "(unset)" },
left: { type: "number", default: "(unset)" },
"anchor-target": {
type: "string",
default: "parent",
description: "\"parent\" or the tag of the instance to anchor to.",
},
"anchor-point": {
type: "enum",
values: ANCHOR_POINTS,
default: "center",
},
"self-anchor": {
type: "enum",
values: ANCHOR_POINTS,
default: "center",
},
"anchor-offset-x": { type: "number", default: 0 },
"anchor-offset-y": { type: "number", default: 0 },
};
// Create lookup for valid properties
this.validProperties = new Set(Object.keys(this.propertyRules));
}
/**
* Validate a single property-value pair
* @param {string} property - The CSS property name
* @param {string} value - The CSS property value
* @param {number} lineNumber - Line number for error reporting (optional)
* @param {number} columnStart - Starting column position (optional)
* @returns {Object} Validation result with isValid, errors, warnings, and parsed value
*/
validateProperty(property, value, lineNumber = 1, columnStart = 1) {
const result = {
isValid: true,
errors: [],
warnings: [],
parsedValue: null,
property: property,
originalValue: value,
};
// Check if property exists
if (!this.validProperties.has(property)) {
result.isValid = false;
const suggestions = this.getSuggestions(property);
result.errors.push({
type: "unknown-property",
message: `'${property}' is not supported by the layout engine`,
line: lineNumber,
column: columnStart,
length: property.length,
severity: "error",
suggestions: suggestions.length ? suggestions : undefined,
});
return result;
}
const rule = this.propertyRules[property];
if (!rule) {
result.isValid = false;
result.errors.push({
type: "internal-error",
message: `Internal validation error for property '${property}'`,
line: lineNumber,
column: columnStart,
length: property.length,
severity: "error",
});
return result;
}
// Add warning for work-in-progress properties
if (rule.warning) {
result.warnings.push({
type: "work-in-progress",
message: rule.warning,
line: lineNumber,
column: columnStart,
length: property.length,
severity: "warning",
});
}
// Validate the value based on the rule type
const valueStart = columnStart + property.length + 1; // +1 for the colon
const validation = this.validateValue(
value,
rule,
lineNumber,
valueStart
);
result.isValid = validation.isValid;
result.errors = validation.errors;
result.warnings = validation.warnings;
result.parsedValue = validation.parsedValue;
return result;
}
/**
* Validate a value against a specific rule
* @param {string} value - The value to validate
* @param {Object} rule - The validation rule
* @param {number} lineNumber - Line number for error reporting
* @param {number} columnStart - Starting column position
* @returns {Object} Validation result
*/
validateValue(value, rule, lineNumber, columnStart) {
const result = {
isValid: true,
errors: [],
warnings: [],
parsedValue: null,
};
// Remove !important if present
const cleanValue = value.replace(/\s*!important\s*$/, "").trim();
if (!cleanValue) {
result.isValid = false;
result.errors.push({
type: "empty-value",
message: "Value cannot be empty",
line: lineNumber,
column: columnStart,
length: value.length,
severity: "error",
});
return result;
}
switch (rule.type) {
case "enum":
return this.validateEnum(
cleanValue,
rule,
lineNumber,