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function.rs
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83 lines (69 loc) · 2.55 KB
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use std::collections::HashSet;
use crate::ast;
use crate::error::{LexicalError, LexicalErrorType};
type ParameterDefs = (Vec<ast::Parameter>, Vec<ast::Expression>);
type ParameterDef = (ast::Parameter, Option<ast::Expression>);
pub fn parse_params(
params: (Vec<ParameterDef>, Vec<ParameterDef>),
) -> Result<ParameterDefs, LexicalError> {
let mut names = vec![];
let mut defaults = vec![];
let mut try_default = |name: &ast::Parameter, default| {
if let Some(default) = default {
defaults.push(default);
} else if !defaults.is_empty() {
// Once we have started with defaults, all remaining arguments must
// have defaults
return Err(LexicalError {
error: LexicalErrorType::DefaultArgumentError,
location: name.location,
});
}
Ok(())
};
for (name, default) in params.0 {
try_default(&name, default)?;
names.push(name);
}
for (name, default) in params.1 {
try_default(&name, default)?;
names.push(name);
}
Ok((names, defaults))
}
type FunctionArgument = (Option<Option<String>>, ast::Expression);
pub fn parse_args(func_args: Vec<FunctionArgument>) -> Result<ast::ArgumentList, LexicalError> {
let mut args = vec![];
let mut keywords = vec![];
let mut keyword_names = HashSet::with_capacity(func_args.len());
for (name, value) in func_args {
match name {
Some(n) => {
if let Some(keyword_name) = n.clone() {
if keyword_names.contains(&keyword_name) {
return Err(LexicalError {
error: LexicalErrorType::DuplicateKeywordArgumentError,
location: value.location,
});
}
keyword_names.insert(keyword_name.clone());
}
keywords.push(ast::Keyword { name: n, value });
}
None => {
// Allow starred args after keyword arguments.
if !keywords.is_empty() && !is_starred(&value) {
return Err(LexicalError {
error: LexicalErrorType::PositionalArgumentError,
location: value.location,
});
}
args.push(value);
}
}
}
Ok(ast::ArgumentList { args, keywords })
}
fn is_starred(exp: &ast::Expression) -> bool {
matches!(exp.node, ast::ExpressionType::Starred { .. })
}