forked from M-Labs/nac3
97 lines
2.9 KiB
Rust
97 lines
2.9 KiB
Rust
use ahash::RandomState;
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use std::collections::HashSet;
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use crate::ast;
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use crate::error::{LexicalError, LexicalErrorType};
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pub struct ArgumentList {
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pub args: Vec<ast::Expr>,
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pub keywords: Vec<ast::Keyword>,
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}
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type ParameterDefs = (Vec<ast::Arg>, Vec<ast::Arg>, Vec<ast::Expr>);
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type ParameterDef = (ast::Arg, Option<ast::Expr>);
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pub fn parse_params(
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params: (Vec<ParameterDef>, Vec<ParameterDef>),
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) -> Result<ParameterDefs, LexicalError> {
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let mut posonly = Vec::with_capacity(params.0.len());
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let mut names = Vec::with_capacity(params.1.len());
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let mut defaults = vec![];
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let mut try_default = |name: &ast::Arg, default| {
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if let Some(default) = default {
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defaults.push(default);
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} else if !defaults.is_empty() {
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// Once we have started with defaults, all remaining arguments must
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// have defaults
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return Err(LexicalError {
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error: LexicalErrorType::DefaultArgumentError,
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location: name.location,
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});
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}
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Ok(())
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};
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for (name, default) in params.0 {
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try_default(&name, default)?;
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posonly.push(name);
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}
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for (name, default) in params.1 {
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try_default(&name, default)?;
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names.push(name);
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}
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Ok((posonly, names, defaults))
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}
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type FunctionArgument = (Option<(ast::Location, Option<String>)>, ast::Expr);
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pub fn parse_args(func_args: Vec<FunctionArgument>) -> Result<ArgumentList, LexicalError> {
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let mut args = vec![];
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let mut keywords = vec![];
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let mut keyword_names = HashSet::with_capacity_and_hasher(func_args.len(), RandomState::new());
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for (name, value) in func_args {
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match name {
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Some((location, name)) => {
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if let Some(keyword_name) = &name {
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if keyword_names.contains(keyword_name) {
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return Err(LexicalError {
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error: LexicalErrorType::DuplicateKeywordArgumentError,
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location,
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});
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}
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keyword_names.insert(keyword_name.clone());
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}
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keywords.push(ast::Keyword::new(
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location,
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ast::KeywordData {
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arg: name,
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value: Box::new(value),
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},
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));
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}
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None => {
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// Allow starred args after keyword arguments.
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if !keywords.is_empty() && !is_starred(&value) {
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return Err(LexicalError {
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error: LexicalErrorType::PositionalArgumentError,
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location: value.location,
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});
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}
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args.push(value);
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}
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}
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}
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Ok(ArgumentList { args, keywords })
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}
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fn is_starred(exp: &ast::Expr) -> bool {
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matches!(exp.node, ast::ExprKind::Starred { .. })
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}
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