1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
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 "#); } }