1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/handlebars/src/block.rs b/vendor/handlebars/src/block.rs
new file mode 100644
index 000000000..1c520bf5b
--- /dev/null
+++ b/vendor/handlebars/src/block.rs
@@ -0,0 +1,126 @@
+use std::collections::BTreeMap;
+
+use serde_json::value::Value as Json;
+
+use crate::error::RenderError;
+use crate::local_vars::LocalVars;
+
+#[derive(Clone, Debug)]
+pub enum BlockParamHolder {
+    // a reference to certain context value
+    Path(Vec<String>),
+    // an actual value holder
+    Value(Json),
+}
+
+impl BlockParamHolder {
+    pub fn value(v: Json) -> BlockParamHolder {
+        BlockParamHolder::Value(v)
+    }
+
+    pub fn path(r: Vec<String>) -> BlockParamHolder {
+        BlockParamHolder::Path(r)
+    }
+}
+
+/// A map holds block parameters. The parameter can be either a value or a reference
+#[derive(Clone, Debug, Default)]
+pub struct BlockParams<'reg> {
+    data: BTreeMap<&'reg str, BlockParamHolder>,
+}
+
+impl<'reg> BlockParams<'reg> {
+    /// Create a empty block parameter map.
+    pub fn new() -> BlockParams<'reg> {
+        BlockParams::default()
+    }
+
+    /// Add a path reference as the parameter. The `path` is a vector of path
+    /// segments the relative to current block's base path.
+    pub fn add_path(&mut self, k: &'reg str, path: Vec<String>) -> Result<(), RenderError> {
+        self.data.insert(k, BlockParamHolder::path(path));
+        Ok(())
+    }
+
+    /// Add a value as parameter.
+    pub fn add_value(&mut self, k: &'reg str, v: Json) -> Result<(), RenderError> {
+        self.data.insert(k, BlockParamHolder::value(v));
+        Ok(())
+    }
+
+    /// Get a block parameter by its name.
+    pub fn get(&self, k: &str) -> Option<&BlockParamHolder> {
+        self.data.get(k)
+    }
+}
+
+/// A data structure holds contextual data for current block scope.
+#[derive(Debug, Clone, Default)]
+pub struct BlockContext<'reg> {
+    /// the base_path of current block scope
+    base_path: Vec<String>,
+    /// the base_value of current block scope, when the block is using a
+    /// constant or derived value as block base
+    base_value: Option<Json>,
+    /// current block context variables
+    block_params: BlockParams<'reg>,
+    /// local variables in current context
+    local_variables: LocalVars,
+}
+
+impl<'reg> BlockContext<'reg> {
+    /// create a new `BlockContext` with default data
+    pub fn new() -> BlockContext<'reg> {
+        BlockContext::default()
+    }
+
+    /// set a local variable into current scope
+    pub fn set_local_var(&mut self, name: &str, value: Json) {
+        self.local_variables.put(name, value);
+    }
+
+    /// get a local variable from current scope
+    pub fn get_local_var(&self, name: &str) -> Option<&Json> {
+        self.local_variables.get(name)
+    }
+
+    /// borrow a reference to current scope's base path
+    /// all paths inside this block will be relative to this path
+    pub fn base_path(&self) -> &Vec<String> {
+        &self.base_path
+    }
+
+    /// borrow a mutable reference to the base path
+    pub fn base_path_mut(&mut self) -> &mut Vec<String> {
+        &mut self.base_path
+    }
+
+    /// borrow the base value
+    pub fn base_value(&self) -> Option<&Json> {
+        self.base_value.as_ref()
+    }
+
+    /// set the base value
+    pub fn set_base_value(&mut self, value: Json) {
+        self.base_value = Some(value);
+    }
+
+    /// Get a block parameter from this block.
+    /// Block parameters needed to be supported by the block helper.
+    /// The typical syntax for block parameter is:
+    ///
+    /// ```skip
+    /// {{#myblock param1 as |block_param1|}}
+    ///    ...
+    /// {{/myblock}}
+    /// ```
+    ///
+    pub fn get_block_param(&self, block_param_name: &str) -> Option<&BlockParamHolder> {
+        self.block_params.get(block_param_name)
+    }
+
+    /// Set a block parameter into this block.
+    pub fn set_block_params(&mut self, block_params: BlockParams<'reg>) {
+        self.block_params = block_params;
+    }
+}