Struct handlebars::PathAndJson

source · 
pub struct PathAndJson<'reg, 'rc> { /* private fields */ }
Expand description

Json wrapper that holds the Json value and reference path information

Implementations§

Examples found in repository?
src/render.rs (line 568)
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fn call_helper_for_value<'reg: 'rc, 'rc>(
    hd: &dyn HelperDef,
    ht: &Helper<'reg, 'rc>,
    r: &'reg Registry<'reg>,
    ctx: &'rc Context,
    rc: &mut RenderContext<'reg, 'rc>,
) -> Result<PathAndJson<'reg, 'rc>, RenderError> {
    match hd.call_inner(ht, r, ctx, rc) {
        Ok(result) => Ok(PathAndJson::new(None, result)),
        Err(e) => {
            if e.is_unimplemented() {
                // parse value from output
                let mut so = StringOutput::new();

                // here we don't want subexpression result escaped,
                // so we temporarily disable it
                let disable_escape = rc.is_disable_escape();
                rc.set_disable_escape(true);

                hd.call(ht, r, ctx, rc, &mut so)?;
                rc.set_disable_escape(disable_escape);

                let string = so.into_string().map_err(RenderError::from)?;
                Ok(PathAndJson::new(
                    None,
                    ScopedJson::Derived(Json::String(string)),
                ))
            } else {
                Err(e)
            }
        }
    }
}

impl Parameter {
    pub fn expand_as_name<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> Result<Cow<'reg, str>, RenderError> {
        match self {
            Parameter::Name(ref name) => Ok(Cow::Borrowed(name)),
            Parameter::Path(ref p) => Ok(Cow::Borrowed(p.raw())),
            Parameter::Subexpression(_) => self
                .expand(registry, ctx, rc)
                .map(|v| v.value().render())
                .map(Cow::Owned),
            Parameter::Literal(ref j) => Ok(Cow::Owned(j.render())),
        }
    }

    pub fn expand<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> Result<PathAndJson<'reg, 'rc>, RenderError> {
        match self {
            Parameter::Name(ref name) => {
                // FIXME: raise error when expanding with name?
                Ok(PathAndJson::new(Some(name.to_owned()), ScopedJson::Missing))
            }
            Parameter::Path(ref path) => {
                if let Some(rc_context) = rc.context() {
                    let result = rc.evaluate2(rc_context.borrow(), path)?;
                    Ok(PathAndJson::new(
                        Some(path.raw().to_owned()),
                        ScopedJson::Derived(result.as_json().clone()),
                    ))
                } else {
                    let result = rc.evaluate2(ctx, path)?;
                    Ok(PathAndJson::new(Some(path.raw().to_owned()), result))
                }
            }
            Parameter::Literal(ref j) => Ok(PathAndJson::new(None, ScopedJson::Constant(j))),
            Parameter::Subexpression(ref t) => match *t.as_element() {
                Expression(ref ht) => {
                    let name = ht.name.expand_as_name(registry, ctx, rc)?;

                    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
                    if let Some(ref d) = rc.get_local_helper(&name) {
                        call_helper_for_value(d.as_ref(), &h, registry, ctx, rc)
                    } else {
                        let mut helper = registry.get_or_load_helper(&name)?;

                        if helper.is_none() {
                            helper = registry.get_or_load_helper(if ht.block {
                                BLOCK_HELPER_MISSING
                            } else {
                                HELPER_MISSING
                            })?;
                        }

                        helper
                            .ok_or_else(|| {
                                RenderError::new(format!("Helper not defined: {:?}", ht.name))
                            })
                            .and_then(|d| call_helper_for_value(d.as_ref(), &h, registry, ctx, rc))
                    }
                }
                _ => unreachable!(),
            },
        }
    }

Returns relative path when the value is referenced If the value is from a literal, the path is None

Examples found in repository?
src/helpers/helper_log.rs (line 32)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        _: &'reg Registry<'reg>,
        _: &'rc Context,
        _: &mut RenderContext<'reg, 'rc>,
        _: &mut dyn Output,
    ) -> HelperResult {
        let param_to_log = h
            .params()
            .iter()
            .map(|p| {
                if let Some(ref relative_path) = p.relative_path() {
                    format!("{}: {}", relative_path, p.value().render())
                } else {
                    p.value().render()
                }
            })
            .collect::<Vec<String>>()
            .join(", ");

        let level = h
            .hash_get("level")
            .and_then(|v| v.value().as_str())
            .unwrap_or("info");

        if let Ok(log_level) = Level::from_str(level) {
            log!(log_level, "{}", param_to_log)
        } else {
            return Err(RenderError::new(&format!(
                "Unsupported logging level {}",
                level
            )));
        }
        Ok(())
    }
More examples
Hide additional examples
src/helpers/helper_with.rs (line 52)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        r: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> HelperResult {
        let param = h
            .param(0)
            .ok_or_else(|| RenderError::new("Param not found for helper \"with\""))?;

        if param.value().is_truthy(false) {
            let mut block = create_block(param);

            if let Some(block_param) = h.block_param() {
                let mut params = BlockParams::new();
                if param.context_path().is_some() {
                    params.add_path(block_param, Vec::with_capacity(0))?;
                } else {
                    params.add_value(block_param, param.value().clone())?;
                }

                block.set_block_params(params);
            }

            rc.push_block(block);

            if let Some(t) = h.template() {
                t.render(r, ctx, rc, out)?;
            };

            rc.pop_block();
            Ok(())
        } else if let Some(t) = h.inverse() {
            t.render(r, ctx, rc, out)
        } else if r.strict_mode() {
            Err(RenderError::strict_error(param.relative_path()))
        } else {
            Ok(())
        }
    }
src/render.rs (line 815)
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    fn render<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> Result<(), RenderError> {
        match self {
            RawString(ref v) => indent_aware_write(v.as_ref(), rc, out),
            Expression(ref ht) | HtmlExpression(ref ht) => {
                let is_html_expression = matches!(self, HtmlExpression(_));
                if is_html_expression {
                    rc.set_disable_escape(true);
                }

                // test if the expression is to render some value
                let result = if ht.is_name_only() {
                    let helper_name = ht.name.expand_as_name(registry, ctx, rc)?;
                    if helper_exists(&helper_name, registry, rc) {
                        render_helper(ht, registry, ctx, rc, out)
                    } else {
                        debug!("Rendering value: {:?}", ht.name);
                        let context_json = ht.name.expand(registry, ctx, rc)?;
                        if context_json.is_value_missing() {
                            if registry.strict_mode() {
                                Err(RenderError::strict_error(context_json.relative_path()))
                            } else {
                                // helper missing
                                if let Some(hook) = registry.get_or_load_helper(HELPER_MISSING)? {
                                    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
                                    hook.call(&h, registry, ctx, rc, out)
                                } else {
                                    Ok(())
                                }
                            }
                        } else {
                            let rendered = context_json.value().render();
                            let output = do_escape(registry, rc, rendered);
                            indent_aware_write(output.as_ref(), rc, out)
                        }
                    }
                } else {
                    // this is a helper expression
                    render_helper(ht, registry, ctx, rc, out)
                };

                if is_html_expression {
                    rc.set_disable_escape(false);
                }

                result
            }
            HelperBlock(ref ht) => render_helper(ht, registry, ctx, rc, out),
            DecoratorExpression(_) | DecoratorBlock(_) => self.eval(registry, ctx, rc),
            PartialExpression(ref dt) | PartialBlock(ref dt) => {
                let di = Decorator::try_from_template(dt, registry, ctx, rc)?;

                partial::expand_partial(&di, registry, ctx, rc, out)
            }
            _ => Ok(()),
        }
    }
src/helpers/helper_each.rs (line 147)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        r: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> HelperResult {
        let value = h
            .param(0)
            .ok_or_else(|| RenderError::new("Param not found for helper \"each\""))?;

        let template = h.template();

        match template {
            Some(t) => match *value.value() {
                Json::Array(ref list)
                    if !list.is_empty() || (list.is_empty() && h.inverse().is_none()) =>
                {
                    let block_context = create_block(value);
                    rc.push_block(block_context);

                    let len = list.len();

                    let array_path = value.context_path();

                    for (i, v) in list.iter().enumerate().take(len) {
                        if let Some(ref mut block) = rc.block_mut() {
                            let is_first = i == 0usize;
                            let is_last = i == len - 1;

                            let index = to_json(i);
                            block.set_local_var("first", to_json(is_first));
                            block.set_local_var("last", to_json(is_last));
                            block.set_local_var("index", index.clone());

                            update_block_context(block, array_path, i.to_string(), is_first, v);
                            set_block_param(block, h, array_path, &index, v)?;
                        }

                        t.render(r, ctx, rc, out)?;
                    }

                    rc.pop_block();
                    Ok(())
                }
                Json::Object(ref obj)
                    if !obj.is_empty() || (obj.is_empty() && h.inverse().is_none()) =>
                {
                    let block_context = create_block(value);
                    rc.push_block(block_context);

                    let len = obj.len();

                    let obj_path = value.context_path();

                    for (i, (k, v)) in obj.iter().enumerate() {
                        if let Some(ref mut block) = rc.block_mut() {
                            let is_first = i == 0usize;
                            let is_last = i == len - 1;

                            let key = to_json(k);
                            block.set_local_var("first", to_json(is_first));
                            block.set_local_var("last", to_json(is_last));
                            block.set_local_var("key", key.clone());

                            update_block_context(block, obj_path, k.to_string(), is_first, v);
                            set_block_param(block, h, obj_path, &key, v)?;
                        }

                        t.render(r, ctx, rc, out)?;
                    }

                    rc.pop_block();
                    Ok(())
                }
                _ => {
                    if let Some(else_template) = h.inverse() {
                        else_template.render(r, ctx, rc, out)
                    } else if r.strict_mode() {
                        Err(RenderError::strict_error(value.relative_path()))
                    } else {
                        Ok(())
                    }
                }
            },
            None => Ok(()),
        }
    }

Returns full path to this value if any

Examples found in repository?
src/helpers/block_util.rs (line 9)
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pub(crate) fn create_block<'reg: 'rc, 'rc>(
    param: &'rc PathAndJson<'reg, 'rc>,
) -> BlockContext<'reg> {
    let mut block = BlockContext::new();

    if let Some(new_path) = param.context_path() {
        *block.base_path_mut() = new_path.clone();
    } else {
        // use clone for now
        block.set_base_value(param.value().clone());
    }

    block
}
More examples
Hide additional examples
src/helpers/helper_with.rs (line 32)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        r: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> HelperResult {
        let param = h
            .param(0)
            .ok_or_else(|| RenderError::new("Param not found for helper \"with\""))?;

        if param.value().is_truthy(false) {
            let mut block = create_block(param);

            if let Some(block_param) = h.block_param() {
                let mut params = BlockParams::new();
                if param.context_path().is_some() {
                    params.add_path(block_param, Vec::with_capacity(0))?;
                } else {
                    params.add_value(block_param, param.value().clone())?;
                }

                block.set_block_params(params);
            }

            rc.push_block(block);

            if let Some(t) = h.template() {
                t.render(r, ctx, rc, out)?;
            };

            rc.pop_block();
            Ok(())
        } else if let Some(t) = h.inverse() {
            t.render(r, ctx, rc, out)
        } else if r.strict_mode() {
            Err(RenderError::strict_error(param.relative_path()))
        } else {
            Ok(())
        }
    }
src/helpers/helper_each.rs (line 91)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        r: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> HelperResult {
        let value = h
            .param(0)
            .ok_or_else(|| RenderError::new("Param not found for helper \"each\""))?;

        let template = h.template();

        match template {
            Some(t) => match *value.value() {
                Json::Array(ref list)
                    if !list.is_empty() || (list.is_empty() && h.inverse().is_none()) =>
                {
                    let block_context = create_block(value);
                    rc.push_block(block_context);

                    let len = list.len();

                    let array_path = value.context_path();

                    for (i, v) in list.iter().enumerate().take(len) {
                        if let Some(ref mut block) = rc.block_mut() {
                            let is_first = i == 0usize;
                            let is_last = i == len - 1;

                            let index = to_json(i);
                            block.set_local_var("first", to_json(is_first));
                            block.set_local_var("last", to_json(is_last));
                            block.set_local_var("index", index.clone());

                            update_block_context(block, array_path, i.to_string(), is_first, v);
                            set_block_param(block, h, array_path, &index, v)?;
                        }

                        t.render(r, ctx, rc, out)?;
                    }

                    rc.pop_block();
                    Ok(())
                }
                Json::Object(ref obj)
                    if !obj.is_empty() || (obj.is_empty() && h.inverse().is_none()) =>
                {
                    let block_context = create_block(value);
                    rc.push_block(block_context);

                    let len = obj.len();

                    let obj_path = value.context_path();

                    for (i, (k, v)) in obj.iter().enumerate() {
                        if let Some(ref mut block) = rc.block_mut() {
                            let is_first = i == 0usize;
                            let is_last = i == len - 1;

                            let key = to_json(k);
                            block.set_local_var("first", to_json(is_first));
                            block.set_local_var("last", to_json(is_last));
                            block.set_local_var("key", key.clone());

                            update_block_context(block, obj_path, k.to_string(), is_first, v);
                            set_block_param(block, h, obj_path, &key, v)?;
                        }

                        t.render(r, ctx, rc, out)?;
                    }

                    rc.pop_block();
                    Ok(())
                }
                _ => {
                    if let Some(else_template) = h.inverse() {
                        else_template.render(r, ctx, rc, out)
                    } else if r.strict_mode() {
                        Err(RenderError::strict_error(value.relative_path()))
                    } else {
                        Ok(())
                    }
                }
            },
            None => Ok(()),
        }
    }
src/partial.rs (line 78)
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pub fn expand_partial<'reg: 'rc, 'rc>(
    d: &Decorator<'reg, 'rc>,
    r: &'reg Registry<'reg>,
    ctx: &'rc Context,
    rc: &mut RenderContext<'reg, 'rc>,
    out: &mut dyn Output,
) -> Result<(), RenderError> {
    // try eval inline partials first
    if let Some(t) = d.template() {
        t.eval(r, ctx, rc)?;
    }

    let tname = d.name();
    if rc.is_current_template(tname) {
        return Err(RenderError::new("Cannot include self in >"));
    }

    let partial = find_partial(rc, r, d, tname)?;

    if let Some(t) = partial {
        // clone to avoid lifetime issue
        // FIXME refactor this to avoid
        let mut local_rc = rc.clone();

        // if tname == PARTIAL_BLOCK
        let is_partial_block = tname == PARTIAL_BLOCK;

        // add partial block depth there are consecutive partial
        // blocks in the stack.
        if is_partial_block {
            local_rc.inc_partial_block_depth();
        } else {
            // depth cannot be lower than 0, which is guaranted in the
            // `dec_partial_block_depth` method
            local_rc.dec_partial_block_depth();
        }

        let mut block_created = false;

        // create context if param given
        if let Some(base_path) = d.param(0).and_then(|p| p.context_path()) {
            // path given, update base_path
            let mut block_inner = BlockContext::new();
            *block_inner.base_path_mut() = base_path.to_vec();

            // because block is moved here, we need another bool variable to track
            // its status for later cleanup
            block_created = true;
            // clear blocks to prevent block params from parent
            // template to be leaked into partials
            // see `test_partial_context_issue_495` for the case.
            local_rc.clear_blocks();
            local_rc.push_block(block_inner);
        }

        if !d.hash().is_empty() {
            // hash given, update base_value
            let hash_ctx = d
                .hash()
                .iter()
                .map(|(k, v)| (*k, v.value()))
                .collect::<HashMap<&str, &Json>>();

            // create block if we didn't (no param provided for partial expression)
            if !block_created {
                let block_inner = if let Some(block) = local_rc.block() {
                    // reuse current block information, including base_path and
                    // base_value if any
                    block.clone()
                } else {
                    BlockContext::new()
                };

                local_rc.clear_blocks();
                local_rc.push_block(block_inner);
            }

            // evaluate context within current block, this includes block
            // context provided by partial expression parameter
            let merged_context = merge_json(
                local_rc.evaluate2(ctx, &Path::current())?.as_json(),
                &hash_ctx,
            );

            // update the base value, there must be a block for this so it's
            // also safe to unwrap.
            if let Some(block) = local_rc.block_mut() {
                block.set_base_value(merged_context);
            }
        }

        // @partial-block
        if let Some(pb) = d.template() {
            local_rc.push_partial_block(pb);
        }

        // indent
        local_rc.set_indent_string(d.indent());

        let result = t.render(r, ctx, &mut local_rc, out);

        // cleanup
        if block_created {
            local_rc.pop_block();
        }

        if d.template().is_some() {
            local_rc.pop_partial_block();
        }

        result
    } else {
        Ok(())
    }
}

Returns the value

Examples found in repository?
src/helpers/block_util.rs (line 13)
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pub(crate) fn create_block<'reg: 'rc, 'rc>(
    param: &'rc PathAndJson<'reg, 'rc>,
) -> BlockContext<'reg> {
    let mut block = BlockContext::new();

    if let Some(new_path) = param.context_path() {
        *block.base_path_mut() = new_path.clone();
    } else {
        // use clone for now
        block.set_base_value(param.value().clone());
    }

    block
}
More examples
Hide additional examples
src/decorators/inline.rs (line 14)
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fn get_name<'reg: 'rc, 'rc>(d: &Decorator<'reg, 'rc>) -> Result<String, RenderError> {
    d.param(0)
        .ok_or_else(|| RenderError::new("Param required for decorator \"inline\""))
        .and_then(|v| {
            v.value()
                .as_str()
                .map(|v| v.to_owned())
                .ok_or_else(|| RenderError::new("inline name must be string"))
        })
}
src/render.rs (line 606)
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    pub fn expand_as_name<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> Result<Cow<'reg, str>, RenderError> {
        match self {
            Parameter::Name(ref name) => Ok(Cow::Borrowed(name)),
            Parameter::Path(ref p) => Ok(Cow::Borrowed(p.raw())),
            Parameter::Subexpression(_) => self
                .expand(registry, ctx, rc)
                .map(|v| v.value().render())
                .map(Cow::Owned),
            Parameter::Literal(ref j) => Ok(Cow::Owned(j.render())),
        }
    }

    pub fn expand<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> Result<PathAndJson<'reg, 'rc>, RenderError> {
        match self {
            Parameter::Name(ref name) => {
                // FIXME: raise error when expanding with name?
                Ok(PathAndJson::new(Some(name.to_owned()), ScopedJson::Missing))
            }
            Parameter::Path(ref path) => {
                if let Some(rc_context) = rc.context() {
                    let result = rc.evaluate2(rc_context.borrow(), path)?;
                    Ok(PathAndJson::new(
                        Some(path.raw().to_owned()),
                        ScopedJson::Derived(result.as_json().clone()),
                    ))
                } else {
                    let result = rc.evaluate2(ctx, path)?;
                    Ok(PathAndJson::new(Some(path.raw().to_owned()), result))
                }
            }
            Parameter::Literal(ref j) => Ok(PathAndJson::new(None, ScopedJson::Constant(j))),
            Parameter::Subexpression(ref t) => match *t.as_element() {
                Expression(ref ht) => {
                    let name = ht.name.expand_as_name(registry, ctx, rc)?;

                    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
                    if let Some(ref d) = rc.get_local_helper(&name) {
                        call_helper_for_value(d.as_ref(), &h, registry, ctx, rc)
                    } else {
                        let mut helper = registry.get_or_load_helper(&name)?;

                        if helper.is_none() {
                            helper = registry.get_or_load_helper(if ht.block {
                                BLOCK_HELPER_MISSING
                            } else {
                                HELPER_MISSING
                            })?;
                        }

                        helper
                            .ok_or_else(|| {
                                RenderError::new(format!("Helper not defined: {:?}", ht.name))
                            })
                            .and_then(|d| call_helper_for_value(d.as_ref(), &h, registry, ctx, rc))
                    }
                }
                _ => unreachable!(),
            },
        }
    }
}

impl Renderable for Template {
    fn render<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> Result<(), RenderError> {
        rc.set_current_template_name(self.name.as_ref());
        let iter = self.elements.iter();

        for (idx, t) in iter.enumerate() {
            t.render(registry, ctx, rc, out).map_err(|mut e| {
                // add line/col number if the template has mapping data
                if e.line_no.is_none() {
                    if let Some(&TemplateMapping(line, col)) = self.mapping.get(idx) {
                        e.line_no = Some(line);
                        e.column_no = Some(col);
                    }
                }

                if e.template_name.is_none() {
                    e.template_name = self.name.clone();
                }

                e
            })?;
        }
        Ok(())
    }
}

impl Evaluable for Template {
    fn eval<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
    ) -> Result<(), RenderError> {
        let iter = self.elements.iter();

        for (idx, t) in iter.enumerate() {
            t.eval(registry, ctx, rc).map_err(|mut e| {
                if e.line_no.is_none() {
                    if let Some(&TemplateMapping(line, col)) = self.mapping.get(idx) {
                        e.line_no = Some(line);
                        e.column_no = Some(col);
                    }
                }

                e.template_name = self.name.clone();
                e
            })?;
        }
        Ok(())
    }
}

fn helper_exists<'reg: 'rc, 'rc>(
    name: &str,
    reg: &Registry<'reg>,
    rc: &RenderContext<'reg, 'rc>,
) -> bool {
    rc.has_local_helper(name) || reg.has_helper(name)
}

#[inline]
fn render_helper<'reg: 'rc, 'rc>(
    ht: &'reg HelperTemplate,
    registry: &'reg Registry<'reg>,
    ctx: &'rc Context,
    rc: &mut RenderContext<'reg, 'rc>,
    out: &mut dyn Output,
) -> Result<(), RenderError> {
    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
    debug!(
        "Rendering helper: {:?}, params: {:?}, hash: {:?}",
        h.name(),
        h.params(),
        h.hash()
    );
    if let Some(ref d) = rc.get_local_helper(h.name()) {
        d.call(&h, registry, ctx, rc, out)
    } else {
        let mut helper = registry.get_or_load_helper(h.name())?;

        if helper.is_none() {
            helper = registry.get_or_load_helper(if ht.block {
                BLOCK_HELPER_MISSING
            } else {
                HELPER_MISSING
            })?;
        }

        helper
            .ok_or_else(|| RenderError::new(format!("Helper not defined: {:?}", h.name())))
            .and_then(|d| d.call(&h, registry, ctx, rc, out))
    }
}

pub(crate) fn do_escape(r: &Registry<'_>, rc: &RenderContext<'_, '_>, content: String) -> String {
    if !rc.is_disable_escape() {
        r.get_escape_fn()(&content)
    } else {
        content
    }
}

#[inline]
fn indent_aware_write(
    v: &str,
    rc: &mut RenderContext<'_, '_>,
    out: &mut dyn Output,
) -> Result<(), RenderError> {
    if let Some(indent) = rc.get_indent_string() {
        out.write(support::str::with_indent(v, indent).as_ref())?;
    } else {
        out.write(v.as_ref())?;
    }
    Ok(())
}

impl Renderable for TemplateElement {
    fn render<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> Result<(), RenderError> {
        match self {
            RawString(ref v) => indent_aware_write(v.as_ref(), rc, out),
            Expression(ref ht) | HtmlExpression(ref ht) => {
                let is_html_expression = matches!(self, HtmlExpression(_));
                if is_html_expression {
                    rc.set_disable_escape(true);
                }

                // test if the expression is to render some value
                let result = if ht.is_name_only() {
                    let helper_name = ht.name.expand_as_name(registry, ctx, rc)?;
                    if helper_exists(&helper_name, registry, rc) {
                        render_helper(ht, registry, ctx, rc, out)
                    } else {
                        debug!("Rendering value: {:?}", ht.name);
                        let context_json = ht.name.expand(registry, ctx, rc)?;
                        if context_json.is_value_missing() {
                            if registry.strict_mode() {
                                Err(RenderError::strict_error(context_json.relative_path()))
                            } else {
                                // helper missing
                                if let Some(hook) = registry.get_or_load_helper(HELPER_MISSING)? {
                                    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
                                    hook.call(&h, registry, ctx, rc, out)
                                } else {
                                    Ok(())
                                }
                            }
                        } else {
                            let rendered = context_json.value().render();
                            let output = do_escape(registry, rc, rendered);
                            indent_aware_write(output.as_ref(), rc, out)
                        }
                    }
                } else {
                    // this is a helper expression
                    render_helper(ht, registry, ctx, rc, out)
                };

                if is_html_expression {
                    rc.set_disable_escape(false);
                }

                result
            }
            HelperBlock(ref ht) => render_helper(ht, registry, ctx, rc, out),
            DecoratorExpression(_) | DecoratorBlock(_) => self.eval(registry, ctx, rc),
            PartialExpression(ref dt) | PartialBlock(ref dt) => {
                let di = Decorator::try_from_template(dt, registry, ctx, rc)?;

                partial::expand_partial(&di, registry, ctx, rc, out)
            }
            _ => Ok(()),
        }
    }
src/helpers/helper_if.rs (line 28)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        r: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> HelperResult {
        let param = h
            .param(0)
            .ok_or_else(|| RenderError::new("Param not found for helper \"if\""))?;
        let include_zero = h
            .hash_get("includeZero")
            .and_then(|v| v.value().as_bool())
            .unwrap_or(false);

        let mut value = param.value().is_truthy(include_zero);

        if !self.positive {
            value = !value;
        }

        let tmpl = if value { h.template() } else { h.inverse() };
        match tmpl {
            Some(t) => t.render(r, ctx, rc, out),
            None => Ok(()),
        }
    }
src/helpers/scripting.rs (line 26)
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fn call_script_helper<'reg: 'rc, 'rc>(
    params: &[PathAndJson<'reg, 'rc>],
    hash: &BTreeMap<&'reg str, PathAndJson<'reg, 'rc>>,
    engine: &Engine,
    script: &AST,
) -> Result<ScopedJson<'reg, 'rc>, RenderError> {
    let params: Dynamic = to_dynamic(params.iter().map(|p| p.value()).collect::<Vec<&Json>>())?;

    let hash: Dynamic = to_dynamic(
        hash.iter()
            .map(|(k, v)| ((*k).to_owned(), v.value()))
            .collect::<HashMap<String, &Json>>(),
    )?;

    let mut scope = Scope::new();
    scope.push_dynamic("params", params);
    scope.push_dynamic("hash", hash);

    let result = engine
        .eval_ast_with_scope::<Dynamic>(&mut scope, script)
        .map_err(RenderError::from)?;

    let result_json: Json = from_dynamic(&result)?;

    Ok(ScopedJson::Derived(result_json))
}
src/helpers/helper_log.rs (line 33)
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    fn call<'reg: 'rc, 'rc>(
        &self,
        h: &Helper<'reg, 'rc>,
        _: &'reg Registry<'reg>,
        _: &'rc Context,
        _: &mut RenderContext<'reg, 'rc>,
        _: &mut dyn Output,
    ) -> HelperResult {
        let param_to_log = h
            .params()
            .iter()
            .map(|p| {
                if let Some(ref relative_path) = p.relative_path() {
                    format!("{}: {}", relative_path, p.value().render())
                } else {
                    p.value().render()
                }
            })
            .collect::<Vec<String>>()
            .join(", ");

        let level = h
            .hash_get("level")
            .and_then(|v| v.value().as_str())
            .unwrap_or("info");

        if let Ok(log_level) = Level::from_str(level) {
            log!(log_level, "{}", param_to_log)
        } else {
            return Err(RenderError::new(&format!(
                "Unsupported logging level {}",
                level
            )));
        }
        Ok(())
    }
Additional examples can be found in:

Test if value is missing

Examples found in repository?
src/render.rs (line 813)
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    fn render<'reg: 'rc, 'rc>(
        &'reg self,
        registry: &'reg Registry<'reg>,
        ctx: &'rc Context,
        rc: &mut RenderContext<'reg, 'rc>,
        out: &mut dyn Output,
    ) -> Result<(), RenderError> {
        match self {
            RawString(ref v) => indent_aware_write(v.as_ref(), rc, out),
            Expression(ref ht) | HtmlExpression(ref ht) => {
                let is_html_expression = matches!(self, HtmlExpression(_));
                if is_html_expression {
                    rc.set_disable_escape(true);
                }

                // test if the expression is to render some value
                let result = if ht.is_name_only() {
                    let helper_name = ht.name.expand_as_name(registry, ctx, rc)?;
                    if helper_exists(&helper_name, registry, rc) {
                        render_helper(ht, registry, ctx, rc, out)
                    } else {
                        debug!("Rendering value: {:?}", ht.name);
                        let context_json = ht.name.expand(registry, ctx, rc)?;
                        if context_json.is_value_missing() {
                            if registry.strict_mode() {
                                Err(RenderError::strict_error(context_json.relative_path()))
                            } else {
                                // helper missing
                                if let Some(hook) = registry.get_or_load_helper(HELPER_MISSING)? {
                                    let h = Helper::try_from_template(ht, registry, ctx, rc)?;
                                    hook.call(&h, registry, ctx, rc, out)
                                } else {
                                    Ok(())
                                }
                            }
                        } else {
                            let rendered = context_json.value().render();
                            let output = do_escape(registry, rc, rendered);
                            indent_aware_write(output.as_ref(), rc, out)
                        }
                    }
                } else {
                    // this is a helper expression
                    render_helper(ht, registry, ctx, rc, out)
                };

                if is_html_expression {
                    rc.set_disable_escape(false);
                }

                result
            }
            HelperBlock(ref ht) => render_helper(ht, registry, ctx, rc, out),
            DecoratorExpression(_) | DecoratorBlock(_) => self.eval(registry, ctx, rc),
            PartialExpression(ref dt) | PartialBlock(ref dt) => {
                let di = Decorator::try_from_template(dt, registry, ctx, rc)?;

                partial::expand_partial(&di, registry, ctx, rc, out)
            }
            _ => Ok(()),
        }
    }

Trait Implementations§

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Should always be Self
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.