use specs::*;
use util::*;
use amq_protocol_types::AMQPType;
use handlebars::{self, Handlebars, Helper, Renderable, RenderContext, RenderError, to_json};
use serde_json::{self};
use std::fs::File;
use std::io::Write;
use std::path::Path;
use std::collections::BTreeMap;
pub type CodeGenerator = Handlebars;
pub trait HandlebarsAMQPExtension {
fn register_amqp_helpers(self) -> Self;
fn simple_codegen(out_dir: &str, target: &str, template_name: &str, template: &str, var_name: &str);
}
impl HandlebarsAMQPExtension for CodeGenerator {
fn register_amqp_helpers(mut self) -> CodeGenerator {
self.register_escape_fn(handlebars::no_escape);
self.register_helper("camel", Box::new(camel_helper));
self.register_helper("snake", Box::new(snake_helper));
self.register_helper("snake_type", Box::new(snake_type_helper));
self.register_helper("sanitize_name", Box::new(sanitize_name_helper));
self.register_helper("each_argument", Box::new(each_argument_helper));
self.register_helper("each_flag", Box::new(each_flag_helper));
self
}
fn simple_codegen(out_dir: &str, target: &str, template_name: &str, template: &str, var_name: &str) {
let dest_path = Path::new(out_dir).join(format!("{}.rs", target));
let mut f = File::create(&dest_path).expect(&format!("Failed to create {}.rs", target));
let specs = AMQProtocolDefinition::load();
let mut codegen = CodeGenerator::new().register_amqp_helpers();
let mut data = BTreeMap::new();
codegen.register_template_string(template_name, template.to_string()).expect(&format!("Failed to register {} template", template_name));
data.insert(var_name.to_string(), specs);
writeln!(f, "{}", codegen.render(template_name, &data).expect(&format!("Failed to render {} template", template_name))).expect(&format!("Failed to generate {}.rs", target));
}
}
pub fn camel_helper (h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"camel\""))?;
let param = value.value().as_str().ok_or_else(|| RenderError::new("Non-string param given to helper \"camel\""))?;
rc.writer.write_all(camel_case(param).as_bytes())?;
Ok(())
}
pub fn snake_helper (h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"snake\""))?;
let param = value.value().as_str().ok_or_else(|| RenderError::new("Non-string param given to helper \"snake\""))?;
rc.writer.write_all(snake_case(param).as_bytes())?;
Ok(())
}
pub fn snake_type_helper (h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"snake\""))?;
let param: AMQPType = serde_json::from_value(value.value().clone()).map_err(|_| RenderError::new("Param is not an AMQPType for helper \"snake_type\""))?;
rc.writer.write_all(snake_case(¶m.to_string()).as_bytes())?;
Ok(())
}
pub fn sanitize_name_helper (h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"sanitize_name\""))?;
let param = value.value().as_str().ok_or_else(|| RenderError::new("Non-string param given to helper \"sanitize_name\""))?;
rc.writer.write_all(param.replace('-', "_").as_bytes())?;
Ok(())
}
pub fn each_argument_helper (h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"each_argument\""))?;
if let Some(t) = h.template() {
rc.promote_local_vars();
let local_path_root = value.path_root().map(|p| format!("{}/{}", rc.get_path(), p));
let arguments : Vec<AMQPArgument> = serde_json::from_value(value.value().clone()).map_err(|_| RenderError::new("Param is not a Vec<AMQPArgument> for helper \"each_argument\""))?;
for (index, argument) in arguments.iter().enumerate() {
let mut local_rc = rc.derive();
if let Some(ref p) = local_path_root {
local_rc.push_local_path_root(p.clone());
}
local_rc.set_local_var("@index".to_string(), to_json(&index));
if let Some(inner_path) = value.path() {
let new_path = format!("{}/{}.[{}]", local_rc.get_path(), inner_path, index);
local_rc.set_path(new_path.clone());
}
if let Some(block_param) = h.block_param() {
let mut map = BTreeMap::new();
match *argument {
AMQPArgument::Value(ref v) => {
map.insert(block_param.to_string(), to_json(v));
map.insert("argument_is_value".to_string(), to_json(&true));
},
AMQPArgument::Flags(ref f) => {
map.insert(block_param.to_string(), to_json(f));
map.insert("argument_is_value".to_string(), to_json(&false));
},
};
local_rc.push_block_context(&map);
}
t.render(r, &mut local_rc)?;
if h.block_param().is_some() {
local_rc.pop_block_context();
}
if local_path_root.is_some() {
local_rc.pop_local_path_root();
}
}
rc.demote_local_vars();
}
Ok(())
}
pub fn each_flag_helper (h: &Helper, r: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
let value = h.param(0).ok_or_else(|| RenderError::new("Param not found for helper \"each_flag\""))?;
if let Some(t) = h.template() {
rc.promote_local_vars();
let local_path_root = value.path_root().map(|p| format!("{}/{}", rc.get_path(), p));
let flags : Vec<AMQPFlagArgument> = serde_json::from_value(value.value().clone()).map_err(|_| RenderError::new("Param is not a Vec<AMQPFlagArgument> for helper \"each_flag\""))?;
for (index, flag) in flags.iter().enumerate() {
let mut local_rc = rc.derive();
if let Some(ref p) = local_path_root {
local_rc.push_local_path_root(p.clone());
}
local_rc.set_local_var("@index".to_string(), to_json(&index));
if let Some(inner_path) = value.path() {
let new_path = format!("{}/{}.[{}]", local_rc.get_path(), inner_path, index);
local_rc.set_path(new_path.clone());
}
if let Some(block_param) = h.block_param() {
let mut map = BTreeMap::new();
map.insert(block_param.to_string(), to_json(flag));
local_rc.push_block_context(&map);
}
t.render(r, &mut local_rc)?;
if h.block_param().is_some() {
local_rc.pop_block_context();
}
if local_path_root.is_some() {
local_rc.pop_local_path_root();
}
}
rc.demote_local_vars();
}
Ok(())
}
#[cfg(test)]
mod test {
use super::*;
use amq_protocol_types::*;
use std::collections::BTreeMap;
pub const TEMPLATE: &'static str = r#"
{{protocol.name}} - {{protocol.major_version}}.{{protocol.minor_version}}.{{protocol.revision}}
{{protocol.copyright}}
port {{protocol.port}}
{{#each protocol.domains ~}}
{{@key}}: {{this}}
{{/each ~}}
{{#each protocol.constants as |constant| ~}}
{{constant.name}} = {{constant.value}}
{{/each ~}}
{{#each protocol.classes as |class| ~}}
{{class.id}} - {{class.name}}
{{#each class.properties as |property| ~}}
{{property.name}}: {{property.type}}
{{/each ~}}
{{#each class.methods as |method| ~}}
{{method.id}} - {{method.name}}
synchronous: {{method.synchronous}}
{{#each_argument method.arguments as |argument| ~}}
{{#if argument_is_value ~}}
{{argument.name}}({{argument.domain}}): {{argument.type}}
{{else}}
{{#each_flag argument as |flag| ~}}
{{flag.name}}: {{flag.default_value}}
{{/each_flag ~}}
{{/if ~}}
{{/each_argument ~}}
{{/each ~}}
{{/each ~}}
"#;
fn specs() -> AMQProtocolDefinition {
let mut domains = BTreeMap::new();
domains.insert("domain1".to_string(), AMQPType::LongString);
AMQProtocolDefinition {
name: "AMQP".to_string(),
major_version: 0,
minor_version: 9,
revision: 1,
port: 5672,
copyright: "Copyright 1\nCopyright 2".to_string(),
domains: domains,
constants: vec![
AMQPConstant {
name: "constant1".to_string(),
amqp_type: AMQPType::ShortUInt,
value: 128,
}
],
soft_errors: Vec::new(),
hard_errors: Vec::new(),
classes: vec![
AMQPClass {
id: 42,
methods: vec![
AMQPMethod {
id: 64,
arguments: vec![
AMQPArgument::Value(AMQPValueArgument {
amqp_type: AMQPType::LongString,
name: "argument1".to_string(),
default_value: Some(AMQPValue::LongString("value1".to_string())),
domain: Some("domain1".to_string()),
}),
AMQPArgument::Flags(vec![
AMQPFlagArgument {
name: "flag1".to_string(),
default_value: true,
},
AMQPFlagArgument {
name: "flag2".to_string(),
default_value: false,
},
]),
],
has_arguments: true,
has_flags: true,
name: "method1".to_string(),
synchronous: true,
}
],
name: "class1".to_string(),
properties: vec![
AMQPProperty {
amqp_type: AMQPType::LongString,
name: "property1".to_string(),
}
],
has_properties: true,
is_connection: false,
}
],
}
}
#[test]
fn main_template() {
let mut data = BTreeMap::new();
let mut codegen = CodeGenerator::new().register_amqp_helpers();
data.insert("protocol".to_string(), specs());
assert!(codegen.register_template_string("main", TEMPLATE.to_string()).is_ok());
assert_eq!(codegen.render("main", &data).unwrap(), r#"
AMQP - 0.9.1
Copyright 1
Copyright 2
port 5672
domain1: LongString
constant1 = 128
42 - class1
property1: LongString
64 - method1
synchronous: true
argument1(domain1): LongString
flag1: true
flag2: false
"#);
}
}