Function evaluate

src/commands/evaluate.rs:10–85

Evaluate a JavaScript expression in the page and return the result.

(
    client: &mut CdpClient,
    session_id: &str,
    expression: &str,
    format: OutputFormat,
    output: Option<&str>,
    track_navigation: bool,
)

/// Evaluate a JavaScript expression in the page and return the result.
pub async fn evaluate(
    client: &mut CdpClient,
    session_id: &str,
    expression: &str,
    format: OutputFormat,
    output: Option<&str>,
    track_navigation: bool,
) -> Result<CommandResult> {
    // Handle JavaScript dialogs (alert, confirm, prompt) during evaluation.
    // `client.dialog_action` must be set to "accept", "dismiss", or a prompt
    // response string before calling this function. The underlying
    // `send_to_target` call will then automatically handle any
    // `Page.javascriptDialogOpening` events that occur.

    let initial_url = if track_navigation {
        Some(client.current_url(session_id).await?)
    } else {
        None
    };

    let result = client
        .send_to_target(
            session_id,
            "Runtime.evaluate",
            json!({
                "expression": expression,
                "returnByValue": true,
                "awaitPromise": true,
            }),
        )
        .await?;

    if let Some(exception) = result.get("exceptionDetails") {
        let text = exception["text"].as_str().unwrap_or("Unknown error");
        let desc = exception["exception"]["description"]
            .as_str()
            .unwrap_or(text);
        anyhow::bail!("{desc}");
    }

    let value = &result["result"];
    let val_type = value["type"].as_str().unwrap_or("undefined");

    let output_hint = if format.is_text() {
        let text = match val_type {
            "undefined" => "undefined".to_string(),
            "string" => value["value"].as_str().unwrap_or("").to_string(),
            _ => {
                if let Some(v) = value.get("value") {
                    serde_json::to_string_pretty(v)?
                } else {
                    value["description"].as_str().unwrap_or("").to_string()
                }
            }
        };

        text
    } else {