vendor/handlebars/src/helpers/helper_log.rs

   1 use crate::context::Context;
   2 #[cfg(not(feature = "no_logging"))]
   3 use crate::error::RenderError;
   4 use crate::helpers::{HelperDef, HelperResult};
   5 #[cfg(not(feature = "no_logging"))]
   6 use crate::json::value::JsonRender;
   7 use crate::output::Output;
   8 use crate::registry::Registry;
   9 use crate::render::{Helper, RenderContext};
  10 #[cfg(not(feature = "no_logging"))]
  11 use log::Level;
  12 #[cfg(not(feature = "no_logging"))]
  13 use std::str::FromStr;
  14
  15 #[derive(Clone, Copy)]
  16 pub struct LogHelper;
  17
  18 #[cfg(not(feature = "no_logging"))]
  19 impl HelperDef for LogHelper {
  20     fn call<'reg: 'rc, 'rc>(
  21         &self,
  22         h: &Helper<'reg, 'rc>,
  23         _: &'reg Registry,
  24         _: &'rc Context,
  25         _: &mut RenderContext<'reg, 'rc>,
  26         _: &mut dyn Output,
  27     ) -> HelperResult {
  28         let param = h
  29             .param(0)
  30             .ok_or_else(|| RenderError::new("Param not found for helper \"log\""))?;
  31         let level = h
  32             .hash_get("level")
  33             .and_then(|v| v.value().as_str())
  34             .unwrap_or("info");
  35
  36         if let Ok(log_level) = Level::from_str(level) {
  37             log!(
  38                 log_level,
  39                 "{}: {}",
  40                 param.relative_path().unwrap_or(&"".to_owned()),
  41                 param.value().render()
  42             )
  43         } else {
  44             return Err(RenderError::new(&format!(
  45                 "Unsupported logging level {}",
  46                 level
  47             )));
  48         }
  49         Ok(())
  50     }
  51 }
  52
  53 #[cfg(feature = "no_logging")]
  54 impl HelperDef for LogHelper {
  55     fn call<'reg: 'rc, 'rc>(
  56         &self,
  57         _: &Helper,
  58         _: &Registry,
  59         _: &Context,
  60         _: &mut RenderContext,
  61         _: &mut dyn Output,
  62     ) -> HelperResult {
  63         Ok(())
  64     }
  65 }
  66
  67 pub static LOG_HELPER: LogHelper = LogHelper;