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|
//! structural search replace
use crate::source_change::SourceFileEdit;
use ra_ide_db::RootDatabase;
use ra_syntax::ast::make::expr_from_text;
use ra_syntax::ast::{AstToken, Comment};
use ra_syntax::{AstNode, SyntaxElement, SyntaxNode};
use ra_text_edit::{TextEdit, TextEditBuilder};
use rustc_hash::FxHashMap;
use std::collections::HashMap;
use std::str::FromStr;
pub use ra_db::{SourceDatabase, SourceDatabaseExt};
use ra_ide_db::symbol_index::SymbolsDatabase;
#[derive(Debug, PartialEq)]
pub struct SsrError(String);
impl std::fmt::Display for SsrError {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "Parse error: {}", self.0)
}
}
impl std::error::Error for SsrError {}
pub fn parse_search_replace(
query: &str,
db: &RootDatabase,
) -> Result<Vec<SourceFileEdit>, SsrError> {
let mut edits = vec![];
let query: SsrQuery = query.parse()?;
for &root in db.local_roots().iter() {
let sr = db.source_root(root);
for file_id in sr.walk() {
dbg!(db.file_relative_path(file_id));
let matches = find(&query.pattern, db.parse(file_id).tree().syntax());
if !matches.matches.is_empty() {
edits.push(SourceFileEdit { file_id, edit: replace(&matches, &query.template) });
}
}
}
Ok(edits)
}
#[derive(Debug)]
struct SsrQuery {
pattern: SsrPattern,
template: SsrTemplate,
}
#[derive(Debug)]
struct SsrPattern {
pattern: SyntaxNode,
vars: Vec<Var>,
}
/// represents an `$var` in an SSR query
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
struct Var(String);
#[derive(Debug)]
struct SsrTemplate {
template: SyntaxNode,
placeholders: FxHashMap<SyntaxNode, Var>,
}
type Binding = HashMap<Var, SyntaxNode>;
#[derive(Debug)]
struct Match {
place: SyntaxNode,
binding: Binding,
ignored_comments: Vec<Comment>,
}
#[derive(Debug)]
struct SsrMatches {
matches: Vec<Match>,
}
impl FromStr for SsrQuery {
type Err = SsrError;
fn from_str(query: &str) -> Result<SsrQuery, SsrError> {
let mut it = query.split("==>>");
let pattern = it.next().expect("at least empty string").trim();
let mut template = it
.next()
.ok_or_else(|| SsrError("Cannot find delemiter `==>>`".into()))?
.trim()
.to_string();
if it.next().is_some() {
return Err(SsrError("More than one delimiter found".into()));
}
let mut vars = vec![];
let mut it = pattern.split('$');
let mut pattern = it.next().expect("something").to_string();
for part in it.map(split_by_var) {
let (var, var_type, remainder) = part?;
is_expr(var_type)?;
let new_var = create_name(var, &mut vars)?;
pattern.push_str(new_var);
pattern.push_str(remainder);
template = replace_in_template(template, var, new_var);
}
let template = expr_from_text(&template).syntax().clone();
let mut placeholders = FxHashMap::default();
traverse(&template, &mut |n| {
if let Some(v) = vars.iter().find(|v| v.0.as_str() == n.text()) {
placeholders.insert(n.clone(), v.clone());
false
} else {
true
}
});
let pattern = SsrPattern { pattern: expr_from_text(&pattern).syntax().clone(), vars };
let template = SsrTemplate { template, placeholders };
Ok(SsrQuery { pattern, template })
}
}
fn traverse(node: &SyntaxNode, go: &mut impl FnMut(&SyntaxNode) -> bool) {
if !go(node) {
return;
}
for ref child in node.children() {
traverse(child, go);
}
}
fn split_by_var(s: &str) -> Result<(&str, &str, &str), SsrError> {
let end_of_name = s.find(':').ok_or_else(|| SsrError("Use $<name>:expr".into()))?;
let name = &s[0..end_of_name];
is_name(name)?;
let type_begin = end_of_name + 1;
let type_length =
s[type_begin..].find(|c| !char::is_ascii_alphanumeric(&c)).unwrap_or_else(|| s.len());
let type_name = &s[type_begin..type_begin + type_length];
Ok((name, type_name, &s[type_begin + type_length..]))
}
fn is_name(s: &str) -> Result<(), SsrError> {
if s.chars().all(|c| c.is_ascii_alphanumeric() || c == '_') {
Ok(())
} else {
Err(SsrError("Name can contain only alphanumerics and _".into()))
}
}
fn is_expr(s: &str) -> Result<(), SsrError> {
if s == "expr" {
Ok(())
} else {
Err(SsrError("Only $<name>:expr is supported".into()))
}
}
fn replace_in_template(template: String, var: &str, new_var: &str) -> String {
let name = format!("${}", var);
template.replace(&name, new_var)
}
fn create_name<'a>(name: &str, vars: &'a mut Vec<Var>) -> Result<&'a str, SsrError> {
let sanitized_name = format!("__search_pattern_{}", name);
if vars.iter().any(|a| a.0 == sanitized_name) {
return Err(SsrError(format!("Name `{}` repeats more than once", name)));
}
vars.push(Var(sanitized_name));
Ok(&vars.last().unwrap().0)
}
fn find(pattern: &SsrPattern, code: &SyntaxNode) -> SsrMatches {
fn check(
pattern: &SyntaxElement,
code: &SyntaxElement,
placeholders: &[Var],
mut match_: Match,
) -> Option<Match> {
match (pattern, code) {
(SyntaxElement::Token(ref pattern), SyntaxElement::Token(ref code)) => {
if pattern.text() == code.text() {
Some(match_)
} else {
None
}
}
(SyntaxElement::Node(ref pattern), SyntaxElement::Node(ref code)) => {
if placeholders.iter().any(|n| n.0.as_str() == pattern.text()) {
match_.binding.insert(Var(pattern.text().to_string()), code.clone());
Some(match_)
} else {
let mut pattern_children = pattern
.children_with_tokens()
.filter(|element| !element.kind().is_trivia());
let mut code_children =
code.children_with_tokens().filter(|element| !element.kind().is_trivia());
let new_ignored_comments = code.children_with_tokens().filter_map(|element| {
element.as_token().and_then(|token| Comment::cast(token.clone()))
});
match_.ignored_comments.extend(new_ignored_comments);
let match_from_children = pattern_children
.by_ref()
.zip(code_children.by_ref())
.fold(Some(match_), |accum, (a, b)| {
accum.and_then(|match_| check(&a, &b, placeholders, match_))
});
match_from_children.and_then(|match_| {
if pattern_children.count() == 0 && code_children.count() == 0 {
Some(match_)
} else {
None
}
})
}
}
_ => None,
}
}
let kind = pattern.pattern.kind();
let matches = code
.descendants_with_tokens()
.filter(|n| n.kind() == kind)
.filter_map(|code| {
let match_ = Match {
place: code.as_node().unwrap().clone(),
binding: HashMap::new(),
ignored_comments: vec![],
};
check(&SyntaxElement::from(pattern.pattern.clone()), &code, &pattern.vars, match_)
})
.collect();
SsrMatches { matches }
}
fn replace(matches: &SsrMatches, template: &SsrTemplate) -> TextEdit {
let mut builder = TextEditBuilder::default();
for match_ in &matches.matches {
builder.replace(
match_.place.text_range(),
render_replace(&match_.binding, &match_.ignored_comments, template),
);
}
builder.finish()
}
fn render_replace(
binding: &Binding,
ignored_comments: &Vec<Comment>,
template: &SsrTemplate,
) -> String {
let mut builder = TextEditBuilder::default();
for element in template.template.descendants() {
if let Some(var) = template.placeholders.get(&element) {
builder.replace(element.text_range(), binding[var].to_string())
}
}
for comment in ignored_comments {
builder.insert(template.template.text_range().end(), comment.syntax().to_string())
}
builder.finish().apply(&template.template.text().to_string())
}
#[cfg(test)]
mod tests {
use super::*;
use ra_syntax::SourceFile;
fn parse_error_text(query: &str) -> String {
format!("{}", query.parse::<SsrQuery>().unwrap_err())
}
#[test]
fn parser_happy_case() {
let result: SsrQuery = "foo($a:expr, $b:expr) ==>> bar($b, $a)".parse().unwrap();
assert_eq!(&result.pattern.pattern.text(), "foo(__search_pattern_a, __search_pattern_b)");
assert_eq!(result.pattern.vars.len(), 2);
assert_eq!(result.pattern.vars[0].0, "__search_pattern_a");
assert_eq!(result.pattern.vars[1].0, "__search_pattern_b");
assert_eq!(&result.template.template.text(), "bar(__search_pattern_b, __search_pattern_a)");
dbg!(result.template.placeholders);
}
#[test]
fn parser_empty_query() {
assert_eq!(parse_error_text(""), "Parse error: Cannot find delemiter `==>>`");
}
#[test]
fn parser_no_delimiter() {
assert_eq!(parse_error_text("foo()"), "Parse error: Cannot find delemiter `==>>`");
}
#[test]
fn parser_two_delimiters() {
assert_eq!(
parse_error_text("foo() ==>> a ==>> b "),
"Parse error: More than one delimiter found"
);
}
#[test]
fn parser_no_pattern_type() {
assert_eq!(parse_error_text("foo($a) ==>>"), "Parse error: Use $<name>:expr");
}
#[test]
fn parser_invalid_name() {
assert_eq!(
parse_error_text("foo($a+:expr) ==>>"),
"Parse error: Name can contain only alphanumerics and _"
);
}
#[test]
fn parser_invalid_type() {
assert_eq!(
parse_error_text("foo($a:ident) ==>>"),
"Parse error: Only $<name>:expr is supported"
);
}
#[test]
fn parser_repeated_name() {
assert_eq!(
parse_error_text("foo($a:expr, $a:expr) ==>>"),
"Parse error: Name `a` repeats more than once"
);
}
#[test]
fn parse_match_replace() {
let query: SsrQuery = "foo($x:expr) ==>> bar($x)".parse().unwrap();
let input = "fn main() { foo(1+2); }";
let code = SourceFile::parse(input).tree();
let matches = find(&query.pattern, code.syntax());
assert_eq!(matches.matches.len(), 1);
assert_eq!(matches.matches[0].place.text(), "foo(1+2)");
assert_eq!(matches.matches[0].binding.len(), 1);
assert_eq!(
matches.matches[0].binding[&Var("__search_pattern_x".to_string())].text(),
"1+2"
);
let edit = replace(&matches, &query.template);
assert_eq!(edit.apply(input), "fn main() { bar(1+2); }");
}
fn assert_ssr_transform(query: &str, input: &str, result: &str) {
let query: SsrQuery = query.parse().unwrap();
let code = SourceFile::parse(input).tree();
let matches = find(&query.pattern, code.syntax());
let edit = replace(&matches, &query.template);
assert_eq!(edit.apply(input), result);
}
#[test]
fn ssr_function_to_method() {
assert_ssr_transform(
"my_function($a:expr, $b:expr) ==>> ($a).my_method($b)",
"loop { my_function( other_func(x, y), z + w) }",
"loop { (other_func(x, y)).my_method(z + w) }",
)
}
#[test]
fn ssr_nested_function() {
assert_ssr_transform(
"foo($a:expr, $b:expr, $c:expr) ==>> bar($c, baz($a, $b))",
"fn main { foo (x + value.method(b), x+y-z, true && false) }",
"fn main { bar(true && false, baz(x + value.method(b), x+y-z)) }",
)
}
#[test]
fn ssr_expected_spacing() {
assert_ssr_transform(
"foo($x:expr) + bar() ==>> bar($x)",
"fn main() { foo(5) + bar() }",
"fn main() { bar(5) }",
);
}
#[test]
fn ssr_with_extra_space() {
assert_ssr_transform(
"foo($x:expr ) + bar() ==>> bar($x)",
"fn main() { foo( 5 ) +bar( ) }",
"fn main() { bar(5) }",
);
}
#[test]
fn ssr_keeps_nested_comment() {
assert_ssr_transform(
"foo($x:expr) ==>> bar($x)",
"fn main() { foo(other(5 /* using 5 */)) }",
"fn main() { bar(other(5 /* using 5 */)) }",
)
}
#[test]
fn ssr_keeps_comment() {
assert_ssr_transform(
"foo($x:expr) ==>> bar($x)",
"fn main() { foo(5 /* using 5 */) }",
"fn main() { bar(5)/* using 5 */ }",
)
}
}
|