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casting syntax

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Altareos
2022-02-24 15:21:23 +01:00
parent 6c5533ae98
commit 05b989125d
1 changed files with 76 additions and 23 deletions
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99
src/lib.rs
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@@ -27,8 +27,11 @@ pub enum Instruction {
Value(String),
Assign(String, Box<Instruction>),
Integer(String),
IntegerCast(Box<Instruction>),
Float(String),
FloatCast(Box<Instruction>),
String(String),
StringCast(Box<Instruction>),
Array(Vec<Instruction>),
Add(Vec<Instruction>),
Subtract(Vec<Instruction>),
@@ -74,20 +77,45 @@ impl Instruction {
.ok_or("missing child on 'assign' tag")?,
)?),
),
"integer" => Instruction::Integer(
node.attribute("value")
.ok_or("missing 'value' attribute on 'integer' tag")?
.parse()?,
),
"float" => Instruction::Float(
node.attribute("value")
.ok_or("missing 'value' attribute on 'float' tag")?
.parse()?,
),
"string" => Instruction::String(String::from(
node.attribute("value")
.ok_or("missing 'value' attribute on 'string' tag")?,
)),
"integer" => node
.attribute("value")
.and_then(|v| Some(Some(Ok(Instruction::Integer(String::from(v))))))
.or_else(|| {
Some(node.first_element_child().and_then(|n| {
Some(
Instruction::new(n)
.and_then(|ins| Ok(Instruction::IntegerCast(Box::new(ins)))),
)
}))
})
.ok_or("missing 'value' attribute or child in 'integer' tag")?
.ok_or("missing 'value' attribute or child in 'integer' tag")??,
"float" => node
.attribute("value")
.and_then(|v| Some(Some(Ok(Instruction::Float(String::from(v))))))
.or_else(|| {
Some(node.first_element_child().and_then(|n| {
Some(
Instruction::new(n)
.and_then(|ins| Ok(Instruction::FloatCast(Box::new(ins)))),
)
}))
})
.ok_or("missing 'value' attribute or child in 'float' tag")?
.ok_or("missing 'value' attribute or child in 'float' tag")??,
"string" => node
.attribute("value")
.and_then(|v| Some(Some(Ok(Instruction::String(String::from(v))))))
.or_else(|| {
Some(node.first_element_child().and_then(|n| {
Some(
Instruction::new(n)
.and_then(|ins| Ok(Instruction::StringCast(Box::new(ins)))),
)
}))
})
.ok_or("missing 'value' attribute or child in 'string' tag")?
.ok_or("missing 'value' attribute or child in 'string' tag")??,
"array" => Instruction::Array(Instruction::from_children(node)?),
"add" => Instruction::Add(Instruction::from_children(node)?),
"subtract" => Instruction::Subtract(Instruction::from_children(node)?),
@@ -482,8 +510,32 @@ impl Instruction {
None
}
Instruction::Integer(val) => Some(Value::Integer(val.parse()?)),
Instruction::IntegerCast(ins) => Some(
Value::Integer(match ins.run(ctx)?.ok_or("no value to be cast to 'integer'")? {
Value::Integer(i) => i,
Value::Float(f) => f as i64,
Value::String(s) => s.parse()?,
_ => Err("value cannot be cast to 'integer'")?
})
),
Instruction::Float(val) => Some(Value::Float(val.parse()?)),
Instruction::FloatCast(ins) => Some(
Value::Float(match ins.run(ctx)?.ok_or("no value to be cast to 'float'")? {
Value::Integer(i) => i as f64,
Value::Float(f) => f,
Value::String(s) => s.parse()?,
_ => Err("value cannot be cast to 'float'")?
})
),
Instruction::String(val) => Some(Value::String(val.clone())),
Instruction::StringCast(ins) => Some(
Value::String(match ins.run(ctx)?.ok_or("no value to be cast to 'string'")? {
Value::Integer(i) => i.to_string(),
Value::Float(f) => f.to_string(),
Value::String(s) => s,
_ => Err("value cannot be cast to 'string'")?
})
),
Instruction::Array(args) => Some(Value::Array(Rc::new(RefCell::new(
Instruction::run_all(args, ctx)?
.ok_or("invalid child values in 'array' tag")?,
@@ -776,7 +828,10 @@ mod stl {
ctx.assign(String::from("array-push"), Value::StdFunction(array_push));
ctx.assign(String::from("array-pop"), Value::StdFunction(array_pop));
ctx.assign(String::from("array-get"), Value::StdFunction(array_get));
ctx.assign(String::from("array-length"), Value::StdFunction(array_length));
ctx.assign(
String::from("array-length"),
Value::StdFunction(array_length),
);
}
fn print(vals: Vec<Value>) -> Result<Option<Value>, Box<dyn Error>> {
@@ -785,8 +840,7 @@ mod stl {
Value::Integer(i) => println!("{}", i),
Value::Float(f) => println!("{}", f),
Value::String(s) => println!("{}", s),
v => println!("{:?}", v)
// _ => Err("unprintable value")?,
v => println!("{:?}", v), // _ => Err("unprintable value")?,
};
Ok(Some(vals[0].clone()))
} else {
@@ -809,9 +863,10 @@ mod stl {
if vals.len() == 2 {
if let Value::String(s) = &vals[0] {
if let Value::String(d) = &vals[1] {
let mut v = s.split(d)
.map(|sub| Value::String(sub.to_string()))
.collect::<Vec<Value>>();
let mut v = s
.split(d)
.map(|sub| Value::String(sub.to_string()))
.collect::<Vec<Value>>();
v.remove(0);
v.pop();
Ok(Some(Value::Array(Rc::new(RefCell::new(v)))))
@@ -901,9 +956,7 @@ mod stl {
fn array_length(vals: Vec<Value>) -> Result<Option<Value>, Box<dyn Error>> {
if vals.len() == 1 {
if let Value::Array(v) = &vals[0] {
Ok(Some(
Value::Integer(v.borrow().len() as i64)
))
Ok(Some(Value::Integer(v.borrow().len() as i64)))
} else {
Err("invalid array in call to 'array-length'")?
}