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//! ZLE text objects
//!
//! Direct port from zsh/Src/Zle/zle_thingy.c text object support
//!
//! Text objects for vi mode operations (e.g., "iw" for inner word, "a)" for a-parenthesis)
use super::main::Zle;
/// Text object type
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TextObjectType {
/// Inner (inside delimiters)
Inner,
/// A (including delimiters)
A,
}
/// Text object kind
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TextObjectKind {
Word,
BigWord,
Sentence,
Paragraph,
Parenthesis,
Bracket,
Brace,
Angle,
SingleQuote,
DoubleQuote,
BackQuote,
}
/// A text object selection (start and end positions)
#[derive(Debug, Clone, Copy)]
pub struct TextObject {
pub start: usize,
pub end: usize,
}
impl Zle {
/// Compute a vi text object range (`iw`/`aw`/`is`/`as`/`ip`/`ap`)
/// at the cursor.
///
/// Port of the dispatcher behind `selectinword` / `selectaword`
/// at Src/Zle/textobjects.c:41 (`selectword`). The C source
/// branches on the bound widget (selectinword, selectaword,
/// selectinblankword, selectablankword, selectinshellword,
/// selectashellword); this Rust helper takes an explicit kind +
/// variant and returns the `(start, end)` range so widget bodies
/// can apply the operator-pending semantics themselves.
pub fn select_text_object(
&self,
obj_type: TextObjectType,
kind: TextObjectKind,
) -> Option<TextObject> {
match kind {
TextObjectKind::Word => self.select_word_object(obj_type, false),
TextObjectKind::BigWord => self.select_word_object(obj_type, true),
TextObjectKind::Sentence => self.select_sentence_object(obj_type),
TextObjectKind::Paragraph => self.select_paragraph_object(obj_type),
TextObjectKind::Parenthesis => self.select_pair_object(obj_type, '(', ')'),
TextObjectKind::Bracket => self.select_pair_object(obj_type, '[', ']'),
TextObjectKind::Brace => self.select_pair_object(obj_type, '{', '}'),
TextObjectKind::Angle => self.select_pair_object(obj_type, '<', '>'),
TextObjectKind::SingleQuote => self.select_quote_object(obj_type, '\''),
TextObjectKind::DoubleQuote => self.select_quote_object(obj_type, '"'),
TextObjectKind::BackQuote => self.select_quote_object(obj_type, '`'),
}
}
fn select_word_object(&self, obj_type: TextObjectType, big_word: bool) -> Option<TextObject> {
if self.zlell == 0 {
return None;
}
let is_word_char = if big_word {
|c: char| !c.is_whitespace()
} else {
|c: char| c.is_alphanumeric() || c == '_'
};
let mut start = self.zlecs;
let mut end = self.zlecs;
// Determine if we're on a word or whitespace
let on_word = if self.zlecs < self.zlell {
is_word_char(self.zleline[self.zlecs])
} else {
false
};
if on_word {
// Find word boundaries
while start > 0 && is_word_char(self.zleline[start - 1]) {
start -= 1;
}
while end < self.zlell && is_word_char(self.zleline[end]) {
end += 1;
}
// For "a word", include trailing whitespace
if obj_type == TextObjectType::A {
while end < self.zlell && self.zleline[end].is_whitespace() {
end += 1;
}
}
} else {
// On whitespace - select whitespace
while start > 0 && self.zleline[start - 1].is_whitespace() {
start -= 1;
}
while end < self.zlell && self.zleline[end].is_whitespace() {
end += 1;
}
// For "a whitespace", include adjacent word
if obj_type == TextObjectType::A && end < self.zlell {
while end < self.zlell && is_word_char(self.zleline[end]) {
end += 1;
}
}
}
if start < end {
Some(TextObject { start, end })
} else {
None
}
}
fn select_sentence_object(&self, obj_type: TextObjectType) -> Option<TextObject> {
// Simplified sentence detection
let mut start = self.zlecs;
let mut end = self.zlecs;
// Find sentence start (after previous . ! ?)
while start > 0 {
let c = self.zleline[start - 1];
if c == '.' || c == '!' || c == '?' {
break;
}
start -= 1;
}
// Skip whitespace at start (for inner)
if obj_type == TextObjectType::Inner {
while start < self.zlell && self.zleline[start].is_whitespace() {
start += 1;
}
}
// Find sentence end
while end < self.zlell {
let c = self.zleline[end];
end += 1;
if c == '.' || c == '!' || c == '?' {
break;
}
}
// Include trailing whitespace for "a sentence"
if obj_type == TextObjectType::A {
while end < self.zlell && self.zleline[end].is_whitespace() {
end += 1;
}
}
if start < end {
Some(TextObject { start, end })
} else {
None
}
}
fn select_paragraph_object(&self, obj_type: TextObjectType) -> Option<TextObject> {
let mut start = self.zlecs;
let mut end = self.zlecs;
// Find paragraph start (blank line)
while start > 0 {
if start >= 2 && self.zleline[start - 1] == '\n' && self.zleline[start - 2] == '\n' {
break;
}
start -= 1;
}
// Find paragraph end
while end < self.zlell {
if end + 1 < self.zlell && self.zleline[end] == '\n' && self.zleline[end + 1] == '\n' {
if obj_type == TextObjectType::A {
end += 2;
}
break;
}
end += 1;
}
if start < end {
Some(TextObject { start, end })
} else {
None
}
}
fn select_pair_object(
&self,
obj_type: TextObjectType,
open: char,
close: char,
) -> Option<TextObject> {
let mut depth = 0;
let mut start = None;
let mut end = None;
// Find opening bracket
for i in (0..=self.zlecs).rev() {
let c = self.zleline[i];
if c == close {
depth += 1;
} else if c == open {
if depth == 0 {
start = Some(i);
break;
}
depth -= 1;
}
}
// Find closing bracket
depth = 0;
for i in self.zlecs..self.zlell {
let c = self.zleline[i];
if c == open {
depth += 1;
} else if c == close {
if depth == 0 {
end = Some(i + 1);
break;
}
depth -= 1;
}
}
match (start, end) {
(Some(s), Some(e)) => {
if obj_type == TextObjectType::Inner {
Some(TextObject {
start: s + 1,
end: e - 1,
})
} else {
Some(TextObject { start: s, end: e })
}
}
_ => None,
}
}
fn select_quote_object(&self, obj_type: TextObjectType, quote: char) -> Option<TextObject> {
let mut start = None;
let mut end = None;
// Find opening quote (searching backward)
for i in (0..=self.zlecs).rev() {
if self.zleline[i] == quote {
start = Some(i);
break;
}
}
// Find closing quote (searching forward)
if let Some(s) = start {
for i in (s + 1)..self.zlell {
if self.zleline[i] == quote {
end = Some(i + 1);
break;
}
}
}
match (start, end) {
(Some(s), Some(e)) => {
if obj_type == TextObjectType::Inner {
Some(TextObject {
start: s + 1,
end: e - 1,
})
} else {
Some(TextObject { start: s, end: e })
}
}
_ => None,
}
}
}