# All files / assets/js gfmr-language-detection.js

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     /**
     * GFMR Language Detection Module
     *
     * Handles language detection for syntax highlighting.
     * Extracted from gfmr-main.js for better modularity.
     *
     * @package MarkdownRendererForGitHub
     * @since 1.8.0
     */

    (function () {
      "use strict";

      /**
       * Language Detector - provides language detection utilities
       */
      const LanguageDetector = {
        /**
         * Detect language from element class, data attributes, or content
         *
         * @param {HTMLElement} element - The code element to analyze
         * @return {string} Detected language or 'plaintext'
         */
        detectLanguage(element) {
          console.log("[DEBUG] Starting language detection for element:", {
            tagName: element.tagName,
            className: element.className,
            classList: Array.from(element.classList || []),
            outerHTML: element.outerHTML.substring(0, 200),
          });

          // 1. Standard language class detection
          const className = element.className || "";
          const match = className.match(/language-(\w+)/);
          if (match) {
            console.log("[DEBUG] Language detected from element:", match[1]);
            return match[1];
          }

          // 2. Detection from parent elements
          let parent = element.parentElement;
          while (parent && parent !== document.body) {
            const parentClassName = parent.className || "";
            const parentMatch = parentClassName.match(/language-(\w+)/);
            if (parentMatch) {
              console.log(
                "[DEBUG] Language detected from parent:",
                parentMatch[1],
                "parent:",
                parent.tagName
              );
              return parentMatch[1];
            }
            parent = parent.parentElement;
          }

          // 3. Data attribute check
          const dataLang =
            element.getAttribute("data-language") ||
            element.closest("[data-language]")?.getAttribute("data-language");
          if (dataLang) {
            console.log("[DEBUG] Language detected from data attribute:", dataLang);
            return dataLang;
          }

          // 4. Infer language from already Shiki-highlighted code
          if (this.isAlreadyHighlighted(element)) {
            const inferredLang = this.inferLanguageFromHighlightedCode(element);
            if (inferredLang !== "plaintext") {
              console.log(
                "[DEBUG] Language inferred from highlighted code:",
                inferredLang
              );
              return inferredLang;
            }
          }

          console.log("[DEBUG] No language detected, falling back to plaintext");
          return "plaintext";
        },

        /**
         * Check if element is already syntax highlighted
         *
         * @param {HTMLElement} element - The code element to check
         * @return {boolean} True if already highlighted
         */
        isAlreadyHighlighted(element) {
          const hasShikiSpans = element.querySelector(
            'span.line, span[style*="color:"]'
          );
          const hasHighlightClass =
            element.classList.contains("hljs") ||
            element.classList.contains("shiki");
          return !!(hasShikiSpans || hasHighlightClass);
        },

        /**
         * Infer language from highlighted code content
         *
         * @param {HTMLElement} element - The code element to analyze
         * @return {string} Inferred language or 'plaintext'
         */
        inferLanguageFromHighlightedCode(element) {
          const text = element.textContent || "";
          console.log(
            "[DEBUG] Language inference target text:",
            text.substring(0, 100) + "..."
          );

          // 1. Language detection by comment syntax (highest priority)
          if (/^\/\/\s*(JavaScript|JS|TypeScript|TS)/i.test(text.trim())) {
            console.log("[DEBUG] Inferred as JavaScript from comment");
            return "javascript";
          }
          if (/^#\s*Python/i.test(text.trim())) {
            console.log("[DEBUG] Inferred as Python from comment");
            return "python";
          }
          if (/^#\s*(YAML|YML)/i.test(text.trim())) {
            console.log("[DEBUG] Inferred as YAML from comment");
            return "yaml";
          }
          if (
            /^\/\*\s*(CSS|Style)/i.test(text.trim()) ||
            /^\/\/\s*(CSS|Style)/i.test(text.trim())
          ) {
            console.log("[DEBUG] Inferred as CSS from comment");
            return "css";
          }
          if (/^<!--\s*(HTML)/i.test(text.trim())) {
            console.log("[DEBUG] Inferred as HTML from comment");
            return "html";
          }

          // Diff/patch patterns (MUST be checked BEFORE bash due to 'sh' in path patterns)
          // Includes: git diff headers, unified diff headers, hunk headers, and content-only diffs
          if (
            /^diff --git\s/m.test(text) ||                    // git diff header
            /^---\s+[ab]\//.test(text.trim()) ||             // unified diff file header (a/...)
            /^---\s+\/dev\/null/.test(text.trim()) ||        // new file diff header
            /^\+\+\+\s+[ab]\//.test(text.trim()) ||          // unified diff file header (b/...)
            /^\+\+\+\s+\/dev\/null/.test(text.trim()) ||     // deleted file diff header
            /^@@\s+-\d+,?\d*\s+\+\d+,?\d*\s+@@/m.test(text) || // hunk header (anywhere in content)
            this.isContentOnlyDiff(text)                      // content-only patch (just +/- lines)
          ) {
            console.log('[DEBUG] Inferred as diff language');
            return 'diff';
          }

          // 2. Bash/Shell patterns (high priority)
          if (
            /^#!/.test(text.trim()) ||
            /\b(set -[euxo]|function\s+\w+|if\s*\[|for\s+\w+\s+in|case\s+.*\s+in|echo\s|export\s|source\s|bash|sh\b)/m.test(
              text
            )
          ) {
            console.log("[DEBUG] Inferred as Bash language");
            return "bash";
          }

          // Mermaid patterns (high priority)
          if (
            /\b(graph|flowchart|sequenceDiagram|classDiagram|stateDiagram|erDiagram|gitGraph|gantt|pie|journey)\b/i.test(
              text
            )
          ) {
            console.log("[DEBUG] Inferred as Mermaid language");
            return "mermaid";
          }

          // YAML patterns (priority over JavaScript/TypeScript)
          if (this.isYamlContent(text)) {
            console.log("[DEBUG] Inferred as YAML language");
            return "yaml";
          }

          // JSX/TSX patterns (high priority)
          if (
            /<[A-Z]\w*[^>]*\/?>/.test(text) &&
            /\b(const|let|var|import|export|function|return)\b/.test(text)
          ) {
            console.log("[DEBUG] Inferred as JSX/TSX language");
            return "javascript";
          }

          // Rust patterns (check before Java/C++)
          if (
            /\b(fn\s+\w+|let\s+mut|impl\s+|pub\s+fn|trait\s+|match\s+\{|&mut\s|&self|Option<|Result<|\.unwrap\(\)|\.expect\(|use\s+std::|use\s+\w+::\{|mod\s+\w+|#\[derive)/i.test(text)
          ) {
            console.log('[DEBUG] Inferred as Rust language');
            return 'rust';
          }

          // Java/C++ patterns
          if (
            /\b(public|private|protected|static|void|int|String|System\.out|#include|std::)\b/.test(
              text
            )
          ) {
            if (
              /\bSystem\.out|public\s+class|public\s+static\s+void\s+main/.test(
                text
              )
            ) {
              console.log("[DEBUG] Inferred as Java language");
              return "java";
            } else if (/#include/.test(text) || /std::(cout|cin|endl|string|vector|map|set)/.test(text)) {
              console.log("[DEBUG] Inferred as C++ language");
              return "cpp";
            }
          }

          // Python patterns (improved version)
          if (
            /\b(def |class |import |from |print\(|if __name__|elif |except:|finally:|with |as |lambda |yield )/m.test(
              text
            ) &&
            !/<[^>]*>/.test(text) && // No HTML tags
            !/\bfunction\b/.test(text)
          ) {
            // No JavaScript functions
            console.log("[DEBUG] Inferred as Python language");
            return "python";
          }

          // JavaScript/TypeScript patterns (revised version)
          if (
            /\b(function\s+\w+|const|let|var|class|import|export|=>|\w+\.\w+\()\b/.test(
              text
            ) &&
            !/^#!/.test(text.trim()) &&
            !this.isYamlContent(text)
          ) {
            // Not YAML
            console.log("[DEBUG] Inferred as JavaScript language");
            return "javascript";
          }

          // HTML patterns (excluding JSX)
          if (
            /<[a-z][^>]*>/.test(text) && // Lowercase tags (JSX components start with uppercase)
            !/\b(const|let|var|function|import|export|=>)\b/.test(text)
          ) {
            // No JS/TS keywords
            console.log("[DEBUG] Inferred as HTML language");
            return "html";
          }

          // CSS patterns (strict validation)
          if (
            /^\s*[.#]?\w+\s*\{|@media|@import|@keyframes/.test(text) ||
            (/\b(margin|padding|display|position|color|background|font-family|font-size|width|height|border|text-align):\s*/.test(
              text
            ) &&
              !/\b(const|let|var|function|return|if|for|while)\b/.test(text))
          ) {
            console.log("[DEBUG] Inferred as CSS language");
            return "css";
          }

          // JSON patterns
          if (/^\s*[{[]/.test(text.trim()) && /[}\]]\s*$/.test(text.trim())) {
            try {
              JSON.parse(text);
              console.log("[DEBUG] Inferred as JSON language");
              return "json";
            } catch {
              // Ignore JSON parsing errors
            }
          }

          console.log("[DEBUG] Inferred as plaintext language");
          return "plaintext";
        },

        /**
         * Detailed method for YAML content determination
         *
         * @param {string} text - The text content to analyze
         * @return {boolean} True if content appears to be YAML
         */
        isYamlContent(text) {
          console.log(
            "[DEBUG] Starting YAML validation:",
            text.substring(0, 150) + "..."
          );

          // Exclude diff patterns from YAML detection
          // Covers: unified diff headers, git diff, /dev/null, hunk headers
          if (
            /^---\s+[ab]\//.test(text.trim()) ||
            /^---\s+\/dev\/null/.test(text.trim()) ||
            /^\+\+\+\s+[ab]\//.test(text.trim()) ||
            /^\+\+\+\s+\/dev\/null/.test(text.trim()) ||
            /^diff --git\s/.test(text.trim()) ||
            /^@@\s+-\d+,?\d*\s+\+\d+,?\d*\s+@@/m.test(text) ||
            this.isContentOnlyDiff(text)
          ) {
            console.log('[DEBUG] Excluded diff content from YAML detection');
            return false;
          }

          // 1. YAML comment patterns
          if (/^#.*\.(ya?ml|yml)/i.test(text) || /# YAML/.test(text)) {
            console.log("[DEBUG] Matched YAML comment pattern");
            return true;
          }

          // 2. Docker Compose specific keywords
          if (
            /^\s*(version|services|volumes|networks|configs|secrets|deploy|build):\s*["']?[\w.-]+["']?\s*$/m.test(
              text
            )
          ) {
            console.log("[DEBUG] Matched Docker Compose specific keywords");
            return true;
          }

          // 3. Typical YAML key:value patterns (colon and space)
          const yamlKeyValuePattern =
            /^\s*[a-zA-Z_][a-zA-Z0-9_-]*:\s*(["'].*["']|\d+\.?\d*|true|false|null|\[|\{|\||>|-\s|$)/m;
          if (yamlKeyValuePattern.test(text)) {
            console.log("[DEBUG] Matched YAML key:value pattern");
            // Additional check to distinguish from JavaScript object notation
            const hasJsPatterns =
              /\b(function|const|let|var|class|=>|\(\)|\.prototype)\b/.test(text);
            if (!hasJsPatterns) {
              console.log(
                "[DEBUG] No JavaScript notation found, determined as YAML"
              );
              return true;
            }
          }

          // 4. YAML list syntax (hyphen + space)
          if (/^\s*-\s+\w+/m.test(text) && !/^\s*-\s*\d+\s*[-+*/]/.test(text)) {
            console.log("[DEBUG] Matched YAML list syntax");
            return true;
          }

          // 5. Indent-based hierarchical structure
          const lines = text.split("\n").filter((line) => line.trim());
          let hasIndentedStructure = false;
          let prevIndent = -1;

          for (const line of lines.slice(0, 10)) {
            // Check the first 10 lines
            if (line.trim().startsWith("#")) continue; // Skip comment lines
            if (!/:\s/.test(line)) continue; // Skip lines without key:value format

            const indent = line.length - line.trimStart().length;
            if (prevIndent >= 0 && indent !== prevIndent && indent > 0) {
              hasIndentedStructure = true;
              break;
            }
            if (prevIndent < 0) prevIndent = indent;
          }

          if (hasIndentedStructure) {
            console.log("[DEBUG] Matched indent hierarchical structure");
            return true;
          }

          console.log("[DEBUG] YAML validation: No match");
          return false;
        },

        /**
         * Detect content-only diff (patch without headers)
         * Only +/- lines without git diff, ---, +++ headers
         * @param {string} text - The text content to analyze
         * @return {boolean} True if content appears to be a content-only diff
         */
        isContentOnlyDiff(text) {
          const lines = text.trim().split('\n');

          // Must have at least 2 lines
          if (lines.length < 2) return false;

          // Check if we have both + and - lines (not headers)
          let hasAddLine = false;
          let hasRemoveLine = false;
          let hasNonDiffLine = false;

          for (const line of lines) {
            // Skip empty lines
            if (!line.trim()) continue;

            // Headers are not content-only
            if (/^(diff --git|---\s|^\+\+\+\s|@@\s+-\d|index\s+[a-f0-9])/.test(line)) {
              return false; // Has headers, let other patterns handle it
            }

            if (/^\+(?!\+)/.test(line)) {
              hasAddLine = true;
            } else if (/^-(?!-)/.test(line)) {
              hasRemoveLine = true;
            } else if (/^\s/.test(line)) {
              // Context lines (leading space) are OK
            } else {
              hasNonDiffLine = true;
            }
          }

          // Content-only diff needs both + and - lines, minimal non-diff content
          if (hasAddLine && hasRemoveLine && !hasNonDiffLine) {
            console.log('[DEBUG] Detected content-only diff pattern');
            return true;
          }

          return false;
        },

        /**
         * Extract plain text from existing Shiki styles
         *
         * @param {HTMLElement} element - The highlighted element
         * @return {string} Plain text content
         */
        extractPlainTextFromHighlighted(element) {
          // Remove all span elements to get text only
          const clone = element.cloneNode(true);
          const spans = clone.querySelectorAll("span");
          spans.forEach((span) => {
            // Replace span content with text node
            const textNode = document.createTextNode(span.textContent);
            span.parentNode.replaceChild(textNode, span);
          });

          let text = clone.textContent || clone.innerText || "";

          // Decode HTML entities
          text = text
            .replace(/&lt;/g, "<")
            .replace(/&gt;/g, ">")
            .replace(/&amp;/g, "&")
            .replace(/&quot;/g, '"')
            .replace(/&#39;/g, "'");

          console.log(
            "[DEBUG] Extracted plain text:",
            text.substring(0, 200) + "..."
          );
          return text;
        },

        /**
         * Mermaid block detection
         *
         * @param {HTMLElement} element - The element to check
         * @return {boolean} True if element is a Mermaid block
         */
        isMermaidBlock(element) {
          const className = element.className || "";

          // CSS class-based detection (existing)
          if (
            className.includes("language-mermaid") ||
            className.includes("mermaid")
          ) {
            return true;
          }

          // Content-based detection for all Mermaid diagram types
          const textContent = (element.textContent || "")
            .trim()
            .replace(/\s+/g, " ");
          // Support all Mermaid diagram types with typo tolerance
          return (
            /^(graph|flowchart)/i.test(textContent) ||
            /^sequenceDiagram/i.test(textContent) ||
            /^stat(e)?Diagram/i.test(textContent) ||
            /^erDiagram/i.test(textContent) ||
            /^gitgraph/i.test(textContent) ||
            /^classDiagram/i.test(textContent) ||
            /^pie/i.test(textContent) ||
            /^gantt/i.test(textContent) ||
            textContent.includes("journey")
          );
        },
      };

      // Export to global scope
      window.wpGfmLanguageDetector = LanguageDetector;
    })();