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* GFMR Charts Module
* Chart.js integration for WordPress (UMD version)
*
* @package WpGfmRenderer
* @since 2.1.0
*/
(function(global) {
'use strict';
class WPGFMCharts {
constructor() {
this.chartjsLoaded = false;
this.chartjsLoadPromise = null;
this.processedCharts = new WeakSet();
// All supported chart types (all free)
this.supportedTypes = new Set([
'line', 'bar', 'pie', 'doughnut',
'scatter', 'bubble', 'radar', 'polarArea'
]);
// Chart configuration defaults
this.defaultConfig = {
responsive: true,
maintainAspectRatio: true,
animation: { duration: 750 }
};
}
/**
* Get current theme mode
* Charts always use light mode for consistency
*/
isDarkTheme() {
// Charts always use light mode
return false;
}
/**
* Get theme colors for charts
* Charts always use light theme colors for consistency
*/
getThemeColors() {
// Charts always use light theme colors
return {
text: '#24292f',
grid: '#d0d7de',
border: '#d0d7de'
};
}
/**
* Merge theme colors into chart config options
* Preserves user-specified colors, applies theme colors only where unspecified
* @param {Object} config - Chart.js configuration object
* @returns {Object} Object containing isDark and colors for container styling
*/
mergeThemeColors(config) {
const colors = this.getThemeColors();
// Deep merge helper - preserves user-specified values
const deepMerge = (target, source) => {
const result = { ...target };
for (const key in source) {
if (source[key] && typeof source[key] === 'object' && !Array.isArray(source[key])) {
result[key] = deepMerge(target[key] || {}, source[key]);
} else if (target[key] === undefined) {
// Only apply source value if target doesn't have it
result[key] = source[key];
}
}
return result;
};
// Theme options (applied only if not user-specified)
const themeOptions = {
color: colors.text,
borderColor: colors.border,
scales: {
x: {
grid: { color: colors.grid },
ticks: { color: colors.text }
},
y: {
grid: { color: colors.grid },
ticks: { color: colors.text }
}
},
plugins: {
legend: { labels: { color: colors.text } },
title: { color: colors.text },
tooltip: {
backgroundColor: 'rgba(255, 255, 255, 0.95)',
titleColor: colors.text,
bodyColor: colors.text,
borderColor: colors.border,
borderWidth: 1
}
}
};
// Merge: user options override theme options
config.options = deepMerge(themeOptions, config.options || {});
// Charts always use light mode
return { isDark: false, colors };
}
/**
* Apply theme colors to Chart.js global defaults
* Charts always use light theme colors
*/
applyThemeToDefaults() {
Iif (!global.Chart) return;
const colors = this.getThemeColors();
// Global text color
global.Chart.defaults.color = colors.text;
// Global border color
global.Chart.defaults.borderColor = colors.border;
// Scale defaults (affects all axes)
Eif (global.Chart.defaults.scale) {
global.Chart.defaults.scale.grid = global.Chart.defaults.scale.grid || {};
global.Chart.defaults.scale.grid.color = colors.grid;
global.Chart.defaults.scale.ticks = global.Chart.defaults.scale.ticks || {};
global.Chart.defaults.scale.ticks.color = colors.text;
}
// Plugins
Eif (global.Chart.defaults.plugins) {
Eif (global.Chart.defaults.plugins.legend?.labels) {
global.Chart.defaults.plugins.legend.labels.color = colors.text;
}
Eif (global.Chart.defaults.plugins.title) {
global.Chart.defaults.plugins.title.color = colors.text;
}
Eif (global.Chart.defaults.plugins.tooltip) {
global.Chart.defaults.plugins.tooltip.backgroundColor = 'rgba(255, 255, 255, 0.95)';
global.Chart.defaults.plugins.tooltip.titleColor = colors.text;
global.Chart.defaults.plugins.tooltip.bodyColor = colors.text;
global.Chart.defaults.plugins.tooltip.borderColor = colors.border;
global.Chart.defaults.plugins.tooltip.borderWidth = 1;
}
}
}
/**
* Load Chart.js library (UMD version)
*/
async ensureChartJSLoaded() {
if (this.chartjsLoaded && global.Chart) {
return global.Chart;
}
Iif (this.chartjsLoadPromise) {
return this.chartjsLoadPromise;
}
this.chartjsLoadPromise = new Promise((resolve, reject) => {
Eif (global.Chart) {
this.chartjsLoaded = true;
resolve(global.Chart);
return;
}
const script = document.createElement('script');
// UMD version
script.src = global.wpGfmBuildAssetUrl('assets/libs/chartjs/chart.umd.min.js');
script.onload = () => {
this.chartjsLoaded = true;
console.log('[GFMR Charts] Chart.js UMD loaded');
// Apply theme defaults after Chart.js is loaded
this.applyThemeToDefaults();
resolve(global.Chart);
};
script.onerror = (error) => {
console.error('[GFMR Charts] Failed to load Chart.js:', error);
reject(error);
};
document.head.appendChild(script);
});
return this.chartjsLoadPromise;
}
/**
* Check if chart type is supported
*/
isChartAllowed(element, config) {
// All chart types are allowed (no Pro/Free distinction)
const chartType = config.type;
if (!this.supportedTypes.has(chartType)) {
return {
allowed: false,
reason: 'unsupported_type',
message: `Unsupported chart type: ${chartType}`
};
}
return { allowed: true };
}
/**
* Parse chart configuration from JSON
*/
parseChartConfig(content) {
try {
const config = JSON.parse(content);
if (!config.type) {
throw new Error('Chart type is required');
}
if (!config.data) {
throw new Error('Chart data is required');
}
config.options = {
...this.defaultConfig,
...(config.options || {})
};
return config;
} catch (error) {
throw new Error(`Invalid chart config: ${error.message}`);
}
}
/**
* Render a single chart
*/
async renderChart(element, config) {
if (this.processedCharts.has(element)) {
return;
}
try {
// Fence-priority check
const checkResult = this.isChartAllowed(element, config);
Eif (global.wpGfmConfig?.debug) {
console.log('[GFMR Charts] Permission check:', config.type, checkResult.allowed ? 'allowed' : checkResult.reason);
}
if (!checkResult.allowed) {
this.renderBlockedMessage(element, checkResult);
return;
}
const Chart = await this.ensureChartJSLoaded();
// Merge theme colors into config (preserves user-specified colors)
// Charts always use light mode
this.mergeThemeColors(config);
// Create container (light theme fixed)
const container = document.createElement('div');
container.className = 'gfmr-chart-container';
const canvas = document.createElement('canvas');
canvas.id = 'gfmr-chart-' + Date.now() + '-' +
Math.random().toString(36).substr(2, 9);
container.appendChild(canvas);
// Replace original element
const targetElement = element.closest('pre') || element.parentElement;
if (targetElement?.parentNode) {
targetElement.parentNode.replaceChild(container, targetElement);
}
new Chart(canvas.getContext('2d'), config);
Eif (global.wpGfmConfig?.debug) {
console.log('[GFMR Charts] Chart rendered:', config.type);
}
this.processedCharts.add(container);
container.setAttribute('data-gfmr-processed', 'true');
} catch (error) {
console.error('[GFMR Charts] Render error:', error);
this.renderErrorMessage(element, error.message);
}
}
/**
* Render blocked message (unsupported chart type)
*/
renderBlockedMessage(element, checkResult) {
Eif (global.wpGfmConfig?.debug) {
console.log('[GFMR Charts] Rendering blocked message:', checkResult.reason);
}
const container = document.createElement('div');
container.className = 'gfmr-chart-blocked';
const message = checkResult.message || 'Chart not available';
container.innerHTML = `
<div class="gfmr-chart-error-content">
<div class="gfmr-chart-error-icon">📊</div>
<strong>${this.escapeHtml(message)}</strong>
</div>
`;
const targetElement = element.closest('pre') || element.parentElement;
if (targetElement?.parentNode) {
targetElement.parentNode.replaceChild(container, targetElement);
}
this.processedCharts.add(container);
}
/**
* Render error message
*/
renderErrorMessage(element, message) {
const container = document.createElement('div');
container.className = 'gfmr-chart-error';
container.innerHTML = `
<div class="gfmr-chart-error-content">
<strong>Chart Error:</strong> ${this.escapeHtml(message)}
</div>
`;
const targetElement = element.closest('pre') || element.parentElement;
if (targetElement?.parentNode) {
targetElement.parentNode.replaceChild(container, targetElement);
}
}
/**
* HTML escape utility
*/
escapeHtml(text) {
const div = document.createElement('div');
div.textContent = text;
return div.innerHTML;
}
/**
* Find and process all chart blocks
*/
async processAllCharts() {
// Search for both chart and chart-pro (exclude processed)
const chartBlocks = document.querySelectorAll(
'code[class*="language-chart"]:not([data-gfmr-chart-processed]), ' +
'code.language-chart:not([data-gfmr-chart-processed]), ' +
'code.language-chart-pro:not([data-gfmr-chart-processed])'
);
console.log(`[GFMR Charts] Found ${chartBlocks.length} chart blocks`);
for (const block of chartBlocks) {
block.setAttribute('data-gfmr-chart-processed', 'true');
const content = block.textContent || '';
try {
const config = this.parseChartConfig(content);
await this.renderChart(block, config);
} catch (error) {
this.renderErrorMessage(block, error.message);
}
}
}
}
// Initialize and export
function initializeCharts() {
const charts = new WPGFMCharts();
global.wpGfmCharts = charts;
// If Chart.js is already loaded, apply theme defaults
if (global.Chart) {
charts.applyThemeToDefaults();
}
return charts;
}
global.WPGFMCharts = WPGFMCharts;
global.wpGfmInitializeCharts = initializeCharts;
})(typeof window !== 'undefined' ? window : global);
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