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…280) `env_var(key)` looks up the value of the environment variable with name `key`, aborting execution if it is not found. `env_var_or_default(key, default)` looks up the value of the environment variable with name `key`, returning `default` if it is not found.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,33 +1,104 @@ | ||
| use common::*; | ||
| use target; | ||
|
|
||
| pub fn resolve_function<'a>(token: &Token<'a>) -> CompilationResult<'a, ()> { | ||
| if !&["arch", "os", "os_family"].contains(&token.lexeme) { | ||
| Err(token.error(CompilationErrorKind::UnknownFunction{function: token.lexeme})) | ||
| lazy_static! { | ||
| static ref FUNCTIONS: Map<&'static str, Function> = vec![ | ||
| ("arch", Function::Nullary(arch )), | ||
| ("os", Function::Nullary(os )), | ||
| ("os_family", Function::Nullary(os_family )), | ||
| ("env_var", Function::Unary (env_var )), | ||
| ("env_var_or_default", Function::Binary (env_var_or_default)), | ||
| ].into_iter().collect(); | ||
| } | ||
|
|
||
| enum Function { | ||
| Nullary(fn( ) -> Result<String, String>), | ||
| Unary (fn(&str ) -> Result<String, String>), | ||
| Binary (fn(&str, &str) -> Result<String, String>), | ||
| } | ||
|
|
||
| impl Function { | ||
| fn argc(&self) -> usize { | ||
| use self::Function::*; | ||
| match *self { | ||
| Nullary(_) => 0, | ||
| Unary(_) => 1, | ||
| Binary(_) => 2, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn resolve_function<'a>(token: &Token<'a>, argc: usize) -> CompilationResult<'a, ()> { | ||
| let name = token.lexeme; | ||
| if let Some(function) = FUNCTIONS.get(&name) { | ||
| use self::Function::*; | ||
| match (function, argc) { | ||
| (&Nullary(_), 0) => Ok(()), | ||
| (&Unary(_), 1) => Ok(()), | ||
| (&Binary(_), 2) => Ok(()), | ||
| _ => { | ||
| Err(token.error(CompilationErrorKind::FunctionArgumentCountMismatch{ | ||
| function: name, found: argc, expected: function.argc(), | ||
| })) | ||
| } | ||
| } | ||
| } else { | ||
| Ok(()) | ||
| Err(token.error(CompilationErrorKind::UnknownFunction{function: token.lexeme})) | ||
| } | ||
| } | ||
|
|
||
| pub fn evaluate_function<'a>(name: &'a str) -> RunResult<'a, String> { | ||
| match name { | ||
| "arch" => Ok(arch().to_string()), | ||
| "os" => Ok(os().to_string()), | ||
| "os_family" => Ok(os_family().to_string()), | ||
| _ => Err(RuntimeError::Internal { | ||
| pub fn evaluate_function<'a>(token: &Token<'a>, name: &'a str, arguments: &[String]) -> RunResult<'a, String> { | ||
| if let Some(function) = FUNCTIONS.get(name) { | ||
| use self::Function::*; | ||
| let argc = arguments.len(); | ||
| match (function, argc) { | ||
| (&Nullary(f), 0) => f() | ||
| .map_err(|message| RuntimeError::FunctionCall{token: token.clone(), message}), | ||
| (&Unary(f), 1) => f(&arguments[0]) | ||
| .map_err(|message| RuntimeError::FunctionCall{token: token.clone(), message}), | ||
| (&Binary(f), 2) => f(&arguments[0], &arguments[1]) | ||
| .map_err(|message| RuntimeError::FunctionCall{token: token.clone(), message}), | ||
| _ => { | ||
| Err(RuntimeError::Internal { | ||
| message: format!("attempted to evaluate function `{}` with {} arguments", name, argc) | ||
| }) | ||
| } | ||
| } | ||
| } else { | ||
| Err(RuntimeError::Internal { | ||
| message: format!("attempted to evaluate unknown function: `{}`", name) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| pub fn arch() -> &'static str { | ||
| target::arch() | ||
| pub fn arch() -> Result<String, String> { | ||
| Ok(target::arch().to_string()) | ||
| } | ||
|
|
||
| pub fn os() -> Result<String, String> { | ||
| Ok(target::os().to_string()) | ||
| } | ||
|
|
||
| pub fn os() -> &'static str { | ||
| target::os() | ||
| pub fn os_family() -> Result<String, String> { | ||
| Ok(target::os_family().to_string()) | ||
| } | ||
|
|
||
| pub fn os_family() -> &'static str { | ||
| target::os_family() | ||
| pub fn env_var<'a>(key: &str) -> Result<String, String> { | ||
| use std::env::VarError::*; | ||
| match env::var(key) { | ||
| Err(NotPresent) => Err(format!("environment variable `{}` not present", key)), | ||
| Err(NotUnicode(os_string)) => | ||
| Err(format!("environment variable `{}` not unicode: {:?}", key, os_string)), | ||
| Ok(value) => Ok(value), | ||
| } | ||
| } | ||
|
|
||
| pub fn env_var_or_default<'a>(key: &str, default: &str) -> Result<String, String> { | ||
| use std::env::VarError::*; | ||
| match env::var(key) { | ||
| Err(NotPresent) => Ok(default.to_string()), | ||
| Err(NotUnicode(os_string)) => | ||
| Err(format!("environment variable `{}` not unicode: {:?}", key, os_string)), | ||
| Ok(value) => Ok(value), | ||
| } | ||
| } |
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