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template.rs
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template.rs
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use super::indent::{
extract_with_deindent, get_indent_at_offset, indent_lines, DeindentedExtract, IndentSensitive,
};
use super::{split_first_meta_var, MetaVarExtract, Replacer, Underlying};
use crate::language::Language;
use crate::matcher::NodeMatch;
use crate::meta_var::MetaVarEnv;
use crate::source::{Content, Doc};
use std::borrow::Cow;
use thiserror::Error;
pub enum Fixer<C: IndentSensitive> {
// no meta_var, pure text
Textual(Vec<C::Underlying>),
WithMetaVar(Template<C>),
}
#[derive(Debug, Error)]
pub enum FixerError {}
impl<C: IndentSensitive> Fixer<C> {
pub fn try_new<L: Language>(template: &str, lang: &L) -> Result<Self, FixerError> {
Ok(create_fixer(template, lang.meta_var_char(), &[]))
}
}
impl<C, D> Replacer<D> for Fixer<C>
where
C: IndentSensitive,
D: Doc<Source = C>,
{
fn generate_replacement(&self, nm: &NodeMatch<D>) -> Underlying<D::Source> {
let leading = nm.root.doc.get_source().get_range(0..nm.range().start);
let indent = get_indent_at_offset::<D::Source>(leading);
let bytes = replace_fixer(self, nm.get_env());
let replaced = DeindentedExtract::MultiLine(&bytes, 0);
indent_lines::<D::Source>(indent, replaced).to_vec()
}
}
type Indent = usize;
pub struct Template<C: IndentSensitive> {
fragments: Vec<Vec<C::Underlying>>,
vars: Vec<(MetaVarExtract, Indent)>,
}
fn create_fixer<C: IndentSensitive>(
mut template: &str,
mv_char: char,
transforms: &[String],
) -> Fixer<C> {
let mut fragments = vec![];
let mut vars = vec![];
let mut offset = 0;
while let Some(i) = template[offset..].find(mv_char) {
if let Some((meta_var, remaining)) =
split_first_meta_var(&template[offset + i..], mv_char, transforms)
{
fragments.push(C::decode_str(&template[..offset + i]).into_owned());
let indent = get_indent_at_offset::<String>(template[..offset + i].as_bytes());
vars.push((meta_var, indent));
template = remaining;
offset = 0;
continue;
}
debug_assert!(offset + i < template.len());
// offset = 0, i = 0,
// 0 1 2
// $ a $
offset = offset + i + 1;
}
if fragments.is_empty() {
Fixer::Textual(C::decode_str(template).into_owned())
} else {
fragments.push(C::decode_str(template).into_owned());
Fixer::WithMetaVar(Template { fragments, vars })
}
}
fn replace_fixer<D: Doc>(
fixer: &Fixer<D::Source>,
env: &MetaVarEnv<D>,
) -> Vec<<D::Source as Content>::Underlying>
where
D::Source: IndentSensitive,
{
let template = match fixer {
Fixer::Textual(n) => return n.to_vec(),
Fixer::WithMetaVar(t) => t,
};
let mut ret = vec![];
let mut frags = template.fragments.iter();
let vars = template.vars.iter();
if let Some(frag) = frags.next() {
ret.extend_from_slice(frag);
}
for ((var, indent), frag) in vars.zip(frags) {
if let Some(bytes) = maybe_get_var(env, var, indent) {
ret.extend_from_slice(&bytes);
}
ret.extend_from_slice(frag);
}
ret
}
fn maybe_get_var<'e, C, D>(
env: &'e MetaVarEnv<D>,
var: &MetaVarExtract,
indent: &usize,
) -> Option<Cow<'e, [C::Underlying]>>
where
C: IndentSensitive + 'e,
D: Doc<Source = C>,
{
let (source, range) = match var {
MetaVarExtract::Transformed(name) => {
let source = env.get_transformed(name)?;
return Some(Cow::Borrowed(source));
}
MetaVarExtract::Single(name) => {
let replaced = env.get_match(name)?;
let source = replaced.root.doc.get_source();
let range = replaced.range();
(source, range)
}
MetaVarExtract::Multiple(name) => {
let nodes = env.get_multiple_matches(name);
if nodes.is_empty() {
return None;
}
// NOTE: start_byte is not always index range of source's slice.
// e.g. start_byte is still byte_offset in utf_16 (napi). start_byte
// so we need to call source's get_range method
let start = nodes[0].inner.start_byte() as usize;
let end = nodes[nodes.len() - 1].inner.end_byte() as usize;
let source = nodes[0].root.doc.get_source();
(source, start..end)
}
};
let extracted = extract_with_deindent(source, range);
let bytes = indent_lines::<D::Source>(*indent, extracted);
Some(bytes)
}
// replace meta_var in template string, e.g. "Hello $NAME" -> "Hello World"
pub fn gen_replacement<D: Doc>(template: &str, nm: &NodeMatch<D>) -> Underlying<D::Source>
where
D::Source: IndentSensitive,
{
let fixer = create_fixer(template, nm.lang().meta_var_char(), &[]);
fixer.generate_replacement(nm)
}
#[cfg(test)]
mod test {
use super::*;
use crate::language::{Language, Tsx};
use crate::meta_var::MetaVarEnv;
use crate::Pattern;
use std::collections::HashMap;
#[test]
fn test_example() {
let src = r"
if (true) {
a(
1
+ 2
+ 3
)
}";
let pattern = "a($B)";
let template = r"c(
$B
)";
let mut src = Tsx.ast_grep(src);
let pattern = Pattern::str(pattern, Tsx);
let success = src.replace(pattern, template).expect("should replace");
assert!(success);
let expect = r"if (true) {
c(
1
+ 2
+ 3
)
}";
assert_eq!(src.root().text(), expect);
}
fn test_str_replace(replacer: &str, vars: &[(&str, &str)], expected: &str) {
let mut env = MetaVarEnv::new();
let roots: Vec<_> = vars
.iter()
.map(|(v, p)| (v, Tsx.ast_grep(p).inner))
.collect();
for (var, root) in &roots {
env.insert(var.to_string(), root.root());
}
let dummy = Tsx.ast_grep("dummy");
let node_match = NodeMatch::new(dummy.root(), env.clone());
let replaced = replacer.generate_replacement(&node_match);
let replaced = String::from_utf8_lossy(&replaced);
assert_eq!(
replaced,
expected,
"wrong replacement {replaced} {expected} {:?}",
HashMap::from(env)
);
}
#[test]
fn test_no_env() {
test_str_replace("let a = 123", &[], "let a = 123");
test_str_replace(
"console.log('hello world'); let b = 123;",
&[],
"console.log('hello world'); let b = 123;",
);
}
#[test]
fn test_single_env() {
test_str_replace("let a = $A", &[("A", "123")], "let a = 123");
test_str_replace(
"console.log($HW); let b = 123;",
&[("HW", "'hello world'")],
"console.log('hello world'); let b = 123;",
);
}
#[test]
fn test_multiple_env() {
test_str_replace("let $V = $A", &[("A", "123"), ("V", "a")], "let a = 123");
test_str_replace(
"console.log($HW); let $B = 123;",
&[("HW", "'hello world'"), ("B", "b")],
"console.log('hello world'); let b = 123;",
);
}
#[test]
fn test_multiple_occurrences() {
test_str_replace("let $A = $A", &[("A", "a")], "let a = a");
test_str_replace("var $A = () => $A", &[("A", "a")], "var a = () => a");
test_str_replace(
"const $A = () => { console.log($B); $A(); };",
&[("B", "'hello world'"), ("A", "a")],
"const a = () => { console.log('hello world'); a(); };",
);
}
fn test_ellipsis_replace(replacer: &str, vars: &[(&str, &str)], expected: &str) {
let mut env = MetaVarEnv::new();
let roots: Vec<_> = vars
.iter()
.map(|(v, p)| (v, Tsx.ast_grep(p).inner))
.collect();
for (var, root) in &roots {
env.insert_multi(var.to_string(), root.root().children().collect());
}
let dummy = Tsx.ast_grep("dummy");
let node_match = NodeMatch::new(dummy.root(), env.clone());
let replaced = replacer.generate_replacement(&node_match);
let replaced = String::from_utf8_lossy(&replaced);
assert_eq!(
replaced,
expected,
"wrong replacement {replaced} {expected} {:?}",
HashMap::from(env)
);
}
#[test]
fn test_ellipsis_meta_var() {
test_ellipsis_replace(
"let a = () => { $$$B }",
&[("B", "alert('works!')")],
"let a = () => { alert('works!') }",
);
test_ellipsis_replace(
"let a = () => { $$$B }",
&[("B", "alert('works!');console.log(123)")],
"let a = () => { alert('works!');console.log(123) }",
);
}
#[test]
fn test_multi_ellipsis() {
test_ellipsis_replace(
"import {$$$A, B, $$$C} from 'a'",
&[("A", "A"), ("C", "C")],
"import {A, B, C} from 'a'",
);
}
#[test]
fn test_replace_in_string() {
test_str_replace("'$A'", &[("A", "123")], "'123'");
}
fn test_template_replace(template: &str, vars: &[(&str, &str)], expected: &str) {
let mut env = MetaVarEnv::new();
let roots: Vec<_> = vars
.iter()
.map(|(v, p)| (v, Tsx.ast_grep(p).inner))
.collect();
for (var, root) in &roots {
env.insert(var.to_string(), root.root());
}
let dummy = Tsx.ast_grep("dummy");
let node_match = NodeMatch::new(dummy.root(), env.clone());
let bytes = template.generate_replacement(&node_match);
let ret = String::from_utf8(bytes).expect("replacement must be valid utf-8");
assert_eq!(expected, ret);
}
#[test]
fn test_template() {
test_template_replace("Hello $A", &[("A", "World")], "Hello World");
test_template_replace("$B $A", &[("A", "World"), ("B", "Hello")], "Hello World");
}
#[test]
fn test_nested_matching_replace() {
// TODO
}
}