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use derive_new::new;
use getset::Getters;
use nu_source::{
b, span_for_spanned_list, DebugDocBuilder, HasFallibleSpan, PrettyDebug, Span, Spanned,
SpannedItem,
};
use num_bigint::BigInt;
use serde::{Deserialize, Serialize};
use crate::hir::{Expression, Literal, Member, SpannedExpression};
use nu_errors::ParseError;
#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize)]
pub enum UnspannedPathMember {
String(String),
Int(BigInt),
}
impl UnspannedPathMember {
pub fn into_path_member(self, span: impl Into<Span>) -> PathMember {
PathMember {
unspanned: self,
span: span.into(),
}
}
}
#[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize)]
pub struct PathMember {
pub unspanned: UnspannedPathMember,
pub span: Span,
}
impl PrettyDebug for &PathMember {
fn pretty(&self) -> DebugDocBuilder {
match &self.unspanned {
UnspannedPathMember::String(string) => b::primitive(format!("{:?}", string)),
UnspannedPathMember::Int(int) => b::primitive(format!("{}", int)),
}
}
}
#[derive(
Debug, Hash, Serialize, Deserialize, Ord, PartialOrd, Eq, PartialEq, Getters, Clone, new,
)]
pub struct ColumnPath {
#[get = "pub"]
members: Vec<PathMember>,
}
impl ColumnPath {
pub fn iter(&self) -> impl Iterator<Item = &PathMember> {
self.members.iter()
}
pub fn split_last(&self) -> Option<(&PathMember, &[PathMember])> {
self.members.split_last()
}
pub fn last(&self) -> Option<&PathMember> {
self.iter().last()
}
pub fn build(text: &Spanned<String>) -> ColumnPath {
if let (
SpannedExpression {
expr: Expression::Literal(Literal::ColumnPath(path)),
span: _,
},
_,
) = parse(&text)
{
ColumnPath {
members: path.iter().map(|member| member.to_path_member()).collect(),
}
} else {
ColumnPath { members: vec![] }
}
}
}
impl PrettyDebug for ColumnPath {
fn pretty(&self) -> DebugDocBuilder {
let members: Vec<DebugDocBuilder> =
self.members.iter().map(|member| member.pretty()).collect();
b::delimit(
"(",
b::description("path") + b::equals() + b::intersperse(members, b::space()),
")",
)
.nest()
}
}
impl HasFallibleSpan for ColumnPath {
fn maybe_span(&self) -> Option<Span> {
if self.members.is_empty() {
None
} else {
Some(span_for_spanned_list(self.members.iter().map(|m| m.span)))
}
}
}
impl PathMember {
pub fn string(string: impl Into<String>, span: impl Into<Span>) -> PathMember {
UnspannedPathMember::String(string.into()).into_path_member(span)
}
pub fn int(int: impl Into<BigInt>, span: impl Into<Span>) -> PathMember {
UnspannedPathMember::Int(int.into()).into_path_member(span)
}
pub fn as_string(&self) -> String {
match &self.unspanned {
UnspannedPathMember::String(string) => string.clone(),
UnspannedPathMember::Int(int) => format!("{}", int),
}
}
}
fn parse(raw_column_path: &Spanned<String>) -> (SpannedExpression, Option<ParseError>) {
let mut delimiter = '.';
let mut inside_delimiter = false;
let mut output = vec![];
let mut current_part = String::new();
let mut start_index = 0;
let mut last_index = 0;
for (idx, c) in raw_column_path.item.char_indices() {
last_index = idx;
if inside_delimiter {
if c == delimiter {
inside_delimiter = false;
}
} else if c == '\'' || c == '"' || c == '`' {
inside_delimiter = true;
delimiter = c;
} else if c == '.' {
let part_span = Span::new(
raw_column_path.span.start() + start_index,
raw_column_path.span.start() + idx,
);
if let Ok(row_number) = current_part.parse::<u64>() {
output.push(Member::Int(BigInt::from(row_number), part_span));
} else {
let trimmed = trim_quotes(¤t_part);
output.push(Member::Bare(trimmed.clone().spanned(part_span)));
}
current_part.clear();
start_index = idx + '.'.len_utf8();
continue;
}
current_part.push(c);
}
if !current_part.is_empty() {
let part_span = Span::new(
raw_column_path.span.start() + start_index,
raw_column_path.span.start() + last_index + 1,
);
if let Ok(row_number) = current_part.parse::<u64>() {
output.push(Member::Int(BigInt::from(row_number), part_span));
} else {
let current_part = trim_quotes(¤t_part);
output.push(Member::Bare(current_part.spanned(part_span)));
}
}
(
SpannedExpression::new(Expression::simple_column_path(output), raw_column_path.span),
None,
)
}
fn trim_quotes(input: &str) -> String {
let mut chars = input.chars();
match (chars.next(), chars.next_back()) {
(Some('\''), Some('\'')) => chars.collect(),
(Some('"'), Some('"')) => chars.collect(),
(Some('`'), Some('`')) => chars.collect(),
_ => input.to_string(),
}
}