chore: import upstream snapshot with attribution

docs/javascripts/pycon_copy.js

@@ -0,0 +1,197 @@
+/**
+ * Custom copy handler for Python console (pycon) code blocks.
+ * Strips >>> and ... prompts when copying code examples.
+ */
+document.addEventListener("DOMContentLoaded", function () {
+  const COPY_BUTTON_SELECTOR = ".md-clipboard, .md-code__button";
+
+  function handleCopyButtonClick(event) {
+    const copyButton = event.target.closest(COPY_BUTTON_SELECTOR);
+    if (!copyButton) return;
+
+    const codeBlock = findCodeBlockForCopyButton(copyButton);
+    if (!codeBlock) return;
+
+    const rawText = codeBlock.textContent || "";
+    if (!shouldStripPrompts(codeBlock, rawText)) return;
+
+    const strippedText = stripPythonPrompts(rawText);
+    primeClipboardButton(copyButton, strippedText);
+  }
+
+  function handleCopyButtonPointerDown(event) {
+    const copyButton = event.target.closest(COPY_BUTTON_SELECTOR);
+    if (!copyButton) return;
+
+    const codeBlock = findCodeBlockForCopyButton(copyButton);
+    if (!codeBlock) return;
+
+    const rawText = codeBlock.textContent || "";
+    if (!shouldStripPrompts(codeBlock, rawText)) return;
+
+    const strippedText = stripPythonPrompts(rawText);
+    primeClipboardButton(copyButton, strippedText);
+  }
+
+  function handleSelectionCopy(event) {
+    const selection = window.getSelection();
+    if (!selection || selection.rangeCount === 0) return;
+
+    const range = selection.getRangeAt(0);
+    const anchorNode = range.commonAncestorContainer;
+    const codeBlock =
+      anchorNode.nodeType === Node.ELEMENT_NODE
+        ? anchorNode.closest("code")
+        : anchorNode.parentElement?.closest("code");
+
+    if (!codeBlock) return;
+
+    const rawText = selection.toString();
+    if (!shouldStripPrompts(codeBlock, rawText)) return;
+
+    event.preventDefault();
+    event.stopPropagation();
+
+    const strippedText = stripPythonPrompts(rawText);
+    event.clipboardData?.setData("text/plain", strippedText);
+  }
+
+  function bindCopyButtons(root) {
+    root
+      .querySelectorAll(COPY_BUTTON_SELECTOR)
+      .forEach((button) => {
+        button.removeEventListener("click", handleCopyButtonClick, true);
+        button.addEventListener("click", handleCopyButtonClick, true);
+        button.removeEventListener(
+          "pointerdown",
+          handleCopyButtonPointerDown,
+          true
+        );
+        button.addEventListener(
+          "pointerdown",
+          handleCopyButtonPointerDown,
+          true
+        );
+      });
+  }
+
+  function observeDynamicCopyButtons() {
+    const observer = new MutationObserver((mutations) => {
+      for (const mutation of mutations) {
+        if (mutation.type !== "childList") continue;
+        mutation.addedNodes.forEach((node) => {
+          if (node.nodeType !== Node.ELEMENT_NODE) return;
+          if (node.matches?.(COPY_BUTTON_SELECTOR)) {
+            bindCopyButtons(node.parentElement || document);
+            return;
+          }
+          if (node.querySelectorAll) {
+            const hasButtons = node.querySelectorAll(COPY_BUTTON_SELECTOR);
+            if (hasButtons.length > 0) {
+              bindCopyButtons(node);
+            }
+          }
+        });
+      }
+    });
+
+    observer.observe(document.body, { childList: true, subtree: true });
+  }
+
+  document.addEventListener("click", handleCopyButtonClick, true);
+  document.addEventListener("pointerdown", handleCopyButtonPointerDown, true);
+  document.addEventListener("copy", handleSelectionCopy, true);
+  bindCopyButtons(document);
+  observeDynamicCopyButtons();
+});
+
+function primeClipboardButton(copyButton, strippedText) {
+  copyButton.setAttribute("data-clipboard-text", strippedText);
+  copyButton.removeAttribute("data-clipboard-target");
+  copyButton.setAttribute("data-md-clipboard", "true");
+}
+
+function shouldStripPrompts(codeBlock, rawText) {
+  const hasReplPrompts = /(^|\n)[ \t]*(>>>|\.\.\.)/.test(rawText);
+  return (
+    hasReplPrompts ||
+    codeBlock.classList.contains("language-pycon") ||
+    codeBlock.closest("pre")?.classList.contains("pycon") ||
+    codeBlock.closest(".pycon") !== null ||
+    codeBlock.closest(".highlight")?.classList.contains("pycon")
+  );
+}
+
+function findCodeBlockForCopyButton(copyButton) {
+  const targetSelector = copyButton.getAttribute("data-clipboard-target");
+  if (targetSelector) {
+    const target = document.querySelector(targetSelector);
+    const targetCode = target?.querySelector?.("code") || target;
+    if (targetCode?.tagName?.toLowerCase() === "code") {
+      return targetCode;
+    }
+  }
+  return (
+    copyButton.closest("pre")?.querySelector("code") ||
+    copyButton.parentElement?.querySelector("pre code") ||
+    copyButton
+      .closest(".highlight, .codehilite, .md-typeset__scrollwrap, .md-typeset")
+      ?.querySelector("pre code") ||
+    copyButton
+      .closest(".highlight, .codehilite, .md-typeset__scrollwrap, .md-typeset")
+      ?.querySelector("code")
+  );
+}
+
+/**
+ * Strips Python REPL prompts (>>> and ...) from code text.
+ * Also removes output lines (lines that don't start with >>> or ...).
+ *
+ * NOTE: This is a best-effort parser. It preserves unprompted lines inside
+ * triple-quoted strings, but it does not fully model Python's tokenizer.
+ */
+function stripPythonPrompts(text) {
+  const lines = text.split("\n");
+  const codeLines = [];
+  let inTripleQuotedString = false;
+
+  function toggleTripleQuoteState(sourceLine) {
+    const tripleQuotePattern = /("""|''')/g;
+    const matches = sourceLine.match(tripleQuotePattern);
+    if (!matches) return;
+    if (matches.length % 2 === 1) {
+      inTripleQuotedString = !inTripleQuotedString;
+    }
+  }
+
+  for (const line of lines) {
+    const trimmedLine = line.trimEnd();
+    // Primary prompt: ">>> "
+    if (trimmedLine.startsWith(">>> ")) {
+      const stripped = trimmedLine.slice(4);
+      codeLines.push(stripped);
+      toggleTripleQuoteState(stripped);
+    }
+    // Continuation prompt: "... "
+    else if (trimmedLine.startsWith("... ")) {
+      const stripped = trimmedLine.slice(4);
+      codeLines.push(stripped);
+      toggleTripleQuoteState(stripped);
+    }
+    // Handle prompts without space after (edge case)
+    else if (trimmedLine === ">>>") {
+      codeLines.push("");
+    }
+    else if (trimmedLine === "...") {
+      codeLines.push("");
+    }
+    else if (inTripleQuotedString) {
+      codeLines.push(trimmedLine);
+      toggleTripleQuoteState(trimmedLine);
+    }
+    // Skip output lines (lines that don't start with prompts)
+    // This intentionally excludes output like "1.0" from the copied text
+  }
+
+  return codeLines.join("\n").trim();
+}