diff_man/parser.rs
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use {
crate::diff::*,
std::{path::PathBuf, str::FromStr},
};
pub struct Parser {}
#[derive(Debug)]
enum ParserState {
Init,
Command,
Index,
OriginPath,
NewPath,
Hunk,
LineChange(Change),
}
#[derive(Debug)]
pub struct ParseError {
kind: ParseErrorKind,
reason: String,
line: String,
}
#[derive(Debug)]
pub enum ParseErrorKind {
InvalidLineStart,
ExpectationFailed,
InvalidLine,
}
impl Parser {
fn parse_line_kind(state: &ParserState, line: &str) -> Line {
match state {
ParserState::Init => {
if line.starts_with("diff") {
Line::Command
} else {
Line::Unknown
}
}
ParserState::Command => {
if line.starts_with("index") {
Line::Index
} else if line.starts_with(DIFF_SIGN_HEADER_ORIGIN) {
Line::OrignPath
} else {
Line::Unknown
}
}
ParserState::Index => {
if line.starts_with(DIFF_SIGN_HEADER_ORIGIN) {
Line::OrignPath
} else {
Line::Unknown
}
}
ParserState::OriginPath => {
if line.starts_with(DIFF_SIGN_HEADER_NEW) {
Line::NewPath
} else {
Line::Unknown
}
}
ParserState::NewPath => {
if line.starts_with(DIFF_SIGN_HUNK) {
Line::Hunk
} else {
Line::Unknown
}
}
ParserState::Hunk => match line.split_at(1) {
(DIFF_SIGN_LINE_ADDED, _) => Line::LineChange(Change::Added),
(DIFF_SIGN_LINE_DEFAULT, _) => {
Line::LineChange(Change::Default)
}
(DIFF_SIGN_LINE_DELETED, _) => {
Line::LineChange(Change::Deleted)
}
_ => Line::Unknown,
},
ParserState::LineChange(_) => {
if line.starts_with("diff") {
Line::Command
} else if line.starts_with("index") {
Line::Index
} else if line.starts_with(DIFF_SIGN_HEADER_ORIGIN) {
Line::OrignPath
} else if line.starts_with(DIFF_SIGN_HUNK) {
Line::Hunk
} else {
match line.split_at(1) {
(DIFF_SIGN_LINE_ADDED, _) => {
Line::LineChange(Change::Added)
}
(DIFF_SIGN_LINE_DEFAULT, _) => {
Line::LineChange(Change::Default)
}
(DIFF_SIGN_LINE_DELETED, _) => {
Line::LineChange(Change::Deleted)
}
_ => Line::Unknown,
}
}
}
}
}
fn parse_line_content<'line>(
line: &'line str,
kind: &Line,
) -> Result<&'line str, ParseError> {
let content = match kind {
Line::Command => line,
Line::Index => {
line.strip_prefix("index ").ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect line start with `index `".to_string(),
line: line.to_string(),
})?
}
Line::OrignPath => {
line.strip_prefix("--- ").ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect line start with `--- `".to_string(),
line: line.to_string(),
})?
}
Line::NewPath => {
line.strip_prefix("+++ ").ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect line start with `+++ `".to_string(),
line: line.to_string(),
})?
}
Line::Hunk => {
let end_offset =
line.find(" @@").ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot find hunk end with ` @@`".to_string(),
line: line.to_string(),
})?;
line.split_at(end_offset).0.strip_prefix("@@ ").ok_or_else(
|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect line start with `@@ `".to_string(),
line: line.to_string(),
},
)?
}
Line::LineChange(_) => line.split_at(1).1,
// this should be unreachable
Line::Unknown => panic!("unknown line start"),
};
Ok(content)
}
pub fn parse_git_udiff(src: &str) -> Result<DiffComposition, ParseError> {
let mut state = ParserState::Init;
// State
// command diff --git a/tests/vm.rs b/tests/vm.rs
// index index 90d5af1..30044cb 100644
// old_path --- a/tests/vm.rs
// new_path +++ b/tests/vm.rs
// hunk @@ -16,7 +16,9 @@ scope..
// linechange... |+|
// linechange... |-|
// linechange... | |
// *hunk @@ ...
let mut diffcom = DiffComposition {
format: DiffFormat::GitUdiff,
diff: Vec::new(),
};
let mut diff_cur: Option<Diff> = None;
let mut hunk_cur: Option<DiffHunk> = None;
for line in src.lines() {
let tag = Self::parse_line_kind(&state, line);
state = match &tag {
Line::Command => ParserState::Command,
Line::Index => ParserState::Index,
Line::OrignPath => ParserState::OriginPath,
Line::NewPath => ParserState::NewPath,
Line::Hunk => ParserState::Hunk,
Line::LineChange(change_kind) => {
ParserState::LineChange(*change_kind)
}
Line::Unknown => Err(ParseError {
kind: ParseErrorKind::InvalidLineStart,
reason: "line starting with invalid token".to_string(),
line: line.to_string(),
})?,
};
let content = Self::parse_line_content(line, &tag)?;
match state {
ParserState::Init => unreachable!(),
ParserState::Command => {
if diff_cur.is_some() {
let mut diff_before = diff_cur.take().unwrap();
if hunk_cur.is_some() {
let hunk_before = hunk_cur.take().unwrap();
diff_before.hunk.push(hunk_before);
}
diffcom.diff.push(diff_before);
}
let (file_path_a, file_path_b) = content
.strip_prefix("diff --git ")
.and_then(|s|s.split_once(' '))
.ok_or_else(||{
ParseError{
kind:ParseErrorKind::ExpectationFailed,
reason:"lines not starting with `diff --git ` or cannot split command's arguments".to_string(
),
line:line.to_string(),
}
})?;
let file_path_a = file_path_a
.strip_prefix("a/")
.ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect to path_a start with `a/`"
.to_string(),
line: line.to_string(),
})?;
let file_path_b = file_path_b
.strip_prefix("b/")
.ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "expect to path_a start with `b/`"
.to_string(),
line: line.to_string(),
})?;
if file_path_a != file_path_b {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "file path a and b are different"
.to_string(),
line: line.to_string(),
})?;
}
let path = PathBuf::from_str(file_path_a).map_err(|e| {
ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!("cannot parse file_path, {:?}", e),
line: line.to_string(),
}
})?;
diff_cur = Some(Diff {
path,
hunk: Vec::new(),
command: Some(content.to_string()),
index: None,
});
}
ParserState::Index => match &mut diff_cur {
Some(cur) => {
if cur.index.is_some() {
Err(ParseError {
kind: ParseErrorKind::InvalidLine,
reason: format!(
"there is index in current diff {:?}",
&diff_cur
),
line: line.to_string(),
})?;
} else {
cur.index = Some(content.to_string())
}
}
None => {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"there is no current diff {:?}",
&diff_cur
),
line: line.to_string(),
})?;
}
},
ParserState::OriginPath => match &diff_cur {
Some(d) => {
let diff_path =
d.path.to_str().ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot convert diff path to str"
.to_string(),
line: line.to_string(),
})?;
let origin_path = content
.strip_prefix("a/")
.ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "old file path not start with `a/`"
.to_string(),
line: line.to_string(),
})?;
if diff_path != origin_path {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"diff path and origin path is different, [diff: {}] [origin: {}]",
diff_path, origin_path
),
line: line.to_string(),
})?;
}
}
None => {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"there is no current diff {:?}",
&diff_cur
),
line: line.to_string(),
})?;
}
},
ParserState::NewPath => match &diff_cur {
Some(d) => {
let diff_path =
d.path.to_str().ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot convert diff path to str"
.to_string(),
line: line.to_string(),
})?;
let new_path =
content.strip_prefix("b/").ok_or_else(|| {
ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "old file path not start with `b/`"
.to_string(),
line: line.to_string(),
}
})?;
if diff_path != new_path {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"diff path and new path is different, [diff: {}] [new: {}]",
diff_path, new_path
),
line: line.to_string(),
})?;
}
}
None => {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"there is no current diff {:?}",
&diff_cur
),
line: line.to_string(),
})?;
}
},
ParserState::Hunk => match &mut diff_cur {
Some(dc) => {
if let Some(hunk_before) = hunk_cur.take() {
dc.hunk.push(hunk_before)
}
let (old, new) =
content.split_once(' ').ok_or_else(|| {
ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "there is no space in hunk line"
.to_string(),
line: line.to_string(),
}
})?;
let (old_line, old_len) =
old.split_once(',').ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot split hunk old range with `,`"
.to_string(),
line: line.to_string(),
})?;
let (new_line, new_len) =
new.split_once(',').ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot split hunk new range with `,`"
.to_string(),
line: line.to_string(),
})?;
let old_line = old_line
.strip_prefix('-')
.ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot strip `-` of old_line"
.to_string(),
line: line.to_string(),
})?
.parse::<usize>()
.map_err(|e| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"cannot parse old_line to usize, {:?}",
e
),
line: line.to_string(),
})?;
let old_len =
old_len.parse::<usize>().map_err(|e| {
ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"cannot parse old_len to usize, {:?}",
e
),
line: line.to_string(),
}
})?;
let new_line = new_line
.strip_prefix('+')
.ok_or_else(|| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "cannot strip `+` of new_line"
.to_string(),
line: line.to_string(),
})?
.parse::<usize>()
.map_err(|e| ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"cannot parse new_line to usize, {:?}",
e
),
line: line.to_string(),
})?;
let new_len =
new_len.parse::<usize>().map_err(|e| {
ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"cannot parse new_len to usize, {:?}",
e
),
line: line.to_string(),
}
})?;
hunk_cur = Some(DiffHunk {
old_line,
old_len,
new_line,
new_len,
change: Vec::new(),
});
}
None => {
panic!("there is no current diff {:?}", &diff_cur)
}
},
ParserState::LineChange(kind) => match &mut hunk_cur {
Some(h) => {
let change = LineChange {
kind,
content: content.to_string(),
};
h.change.push(change)
}
None => {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: format!(
"there is no current hunk. current diff {:?}",
&diff_cur
),
line: line.to_string(),
})?;
}
},
}
}
if let Some(hunk) = hunk_cur {
match &mut diff_cur {
Some(c) => c.hunk.push(hunk),
None => {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "there is no diff_cur to add hunk".to_string(),
line: "".to_string(),
})?;
}
}
}
if let Some(diff) = diff_cur {
diffcom.diff.push(diff);
} else {
Err(ParseError {
kind: ParseErrorKind::ExpectationFailed,
reason: "there is no diff_cur at end".to_string(),
line: "".to_string(),
})?;
}
Ok(diffcom)
}
}
#[cfg(test)]
mod test {
use core::panic;
use crate::{
diff::*,
parser::{Parser, ParserState},
};
const short_test_data: &str = r#"diff --git a/tests/vm.rs b/tests/vm.rs
index 90d5af1..30044cb 100644
--- a/tests/vm.rs
+++ b/tests/vm.rs
@@ -16,7 +16,9 @@ fn run_vm_test(tests: Tests<Option<Object>>) {
let program = Parser::new(lexer).parse().unwrap();
let mut comp = Compiler::create().unwrap();
- comp.compile(program);
+ if let Err(e) = comp.compile(program) {
+ panic!("Compile error {:?}", e);
+ }
let bytecode = comp.bytecode().unwrap();
println!("Bytecode\n{}", bytecode.to_string());
@@ -25,7 +27,7 @@ fn run_vm_test(tests: Tests<Option<Object>>) {
while vm.is_runable() {
if let Err(err) = vm.run_single() {
- eprintln!("Error {:?}", err);
+ panic!("VmError {:?}", err)
}
}
println!("VM STACK:\n {}", vm.stack_to_string());
@@ -262,8 +264,7 @@ let no_return = fn() { };no_return() no_return() no_return() no_return()
tests.add((
"
-let fun = fn() { 10 + 20 };
-fun()
+let fun = fn() { 10 + 20 }; fun()
",
Some(Object::Int(Int { value: 30 })),
));
"#;
#[test]
fn test_parse_linestart() {
let mut state = ParserState::Init;
for line in short_test_data.lines() {
let tag = Parser::parse_line_kind(&state, line);
state = match &tag {
Line::Command => ParserState::Command,
Line::Index => ParserState::Index,
Line::OrignPath => ParserState::OriginPath,
Line::NewPath => ParserState::NewPath,
Line::Hunk => ParserState::Hunk,
Line::LineChange(change_kind) => {
ParserState::LineChange(*change_kind)
}
Line::Unknown => panic!("Unknown line start"),
};
println!("[S:{:?}] [T:{:?}] -- L>{}", &state, &tag, &line);
}
}
#[test]
fn test_parse_udiff() {
let com = Parser::parse_git_udiff(short_test_data).unwrap();
println!("{:#?}", com);
}
}