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use crate::constants::{LAST_COLUMN, LAST_ROW};
use crate::expressions::{token::TokenType, utils::column_to_number};
use super::Lexer;
use super::{ParsedRange, ParsedReference, Result};
impl<'a> Lexer<'a> {
/// Consumes a reference in A1 style like:
/// AS23, $AS23, AS$23, $AS$23, R12
/// Or returns an error
fn consume_reference_a1(&mut self) -> Result<ParsedReference> {
let mut absolute_column = false;
let mut absolute_row = false;
let mut position = self.position;
let len = self.len;
if position < len && self.chars[position] == '$' {
absolute_column = true;
position += 1;
}
let mut column = "".to_string();
while position < len {
let x = self.chars[position].to_ascii_uppercase();
match x {
'A'..='Z' => column.push(x),
_ => break,
}
position += 1;
}
if column.is_empty() {
return Err(self.set_error("Failed to parse reference", position));
}
if position < len && self.chars[position] == '$' {
absolute_row = true;
position += 1;
}
let mut row = "".to_string();
while position < len {
let x = self.chars[position];
match x {
'0'..='9' => row.push(x),
_ => break,
}
position += 1;
}
// Note that row numbers could start with 0
self.position = position;
let column = column_to_number(&column).map_err(|error| self.set_error(&error, position))?;
match row.parse::<i32>() {
Ok(row) => {
if row > LAST_ROW {
return Err(self.set_error("Row too large in reference", position));
}
Ok(ParsedReference {
column,
row,
absolute_column,
absolute_row,
})
}
Err(..) => Err(self.set_error("Failed to parse integer", position)),
}
}
// Parsing a range is a parser on it's own right. Here is the grammar:
//
// range -> cell | cell ':' cell | row ':' row | column ':' column
// cell -> column row
// column -> '$' column_name | column_name
// row -> '$' row_name | row_name
// column_name -> 'A'..'XFD'
// row_name -> 1..1_048_576
//
/// Consumes a range of references in A1 style like:
/// AS23:AS24, $AS23:AS24, AS$23:AS24, $AS$23:AS24, R12:R23, $R12:R23, R$12:R23, $R$12:R23
pub(super) fn consume_range_a1(&mut self) -> Result<ParsedRange> {
// first let's try to parse a cell
let mut position = self.position;
match self.consume_reference_a1() {
Ok(cell) => {
if self.peek_char() == Some(':') {
// It's a range
self.position += 1;
if let Ok(cell2) = self.consume_reference_a1() {
Ok(ParsedRange {
left: cell,
right: Some(cell2),
})
} else {
Err(self.set_error("Expecting reference in range", self.position))
}
} else {
// just a reference
Ok(ParsedRange {
left: cell,
right: None,
})
}
}
Err(_) => {
self.position = position;
// It's either a row range or a column range (or not a range at all)
let len = self.len;
let mut absolute_left = false;
if position < len && self.chars[position] == '$' {
absolute_left = true;
position += 1;
}
let mut column_left = "".to_string();
let mut row_left = "".to_string();
while position < len {
let x = self.chars[position].to_ascii_uppercase();
match x {
'A'..='Z' => column_left.push(x),
'0'..='9' => row_left.push(x),
_ => break,
}
position += 1;
}
if position >= len || self.chars[position] != ':' {
return Err(self.set_error("Expecting reference in range", self.position));
}
position += 1;
let mut absolute_right = false;
if position < len && self.chars[position] == '$' {
absolute_right = true;
position += 1;
}
let mut column_right = "".to_string();
let mut row_right = "".to_string();
while position < len {
let x = self.chars[position].to_ascii_uppercase();
match x {
'A'..='Z' => column_right.push(x),
'0'..='9' => row_right.push(x),
_ => break,
}
position += 1;
}
self.position = position;
// At this point either the columns are the empty string or the rows are the empty string
if !row_left.is_empty() {
// It is a row range 23:56
if row_right.is_empty() || !column_left.is_empty() || !column_right.is_empty() {
return Err(self.set_error("Error parsing Range", position));
}
// Note that row numbers can start with 0
let row_left = match row_left.parse::<i32>() {
Ok(n) => n,
Err(_) => {
return Err(
self.set_error(&format!("Failed parsing row {row_left}"), position)
)
}
};
let row_right = match row_right.parse::<i32>() {
Ok(n) => n,
Err(_) => {
return Err(self
.set_error(&format!("Failed parsing row {row_right}"), position))
}
};
if row_left > LAST_ROW {
return Err(self.set_error("Row too large in reference", position));
}
if row_right > LAST_ROW {
return Err(self.set_error("Row too large in reference", position));
}
return Ok(ParsedRange {
left: ParsedReference {
row: row_left,
absolute_row: absolute_left,
column: 1,
absolute_column: true,
},
right: Some(ParsedReference {
row: row_right,
absolute_row: absolute_right,
column: LAST_COLUMN,
absolute_column: true,
}),
});
}
// It is a column range
if column_right.is_empty() || !row_right.is_empty() {
return Err(self.set_error("Error parsing Range", position));
}
let column_left = column_to_number(&column_left)
.map_err(|error| self.set_error(&error, position))?;
let column_right = column_to_number(&column_right)
.map_err(|error| self.set_error(&error, position))?;
Ok(ParsedRange {
left: ParsedReference {
row: 1,
absolute_row: true,
column: column_left,
absolute_column: absolute_left,
},
right: Some(ParsedReference {
row: LAST_ROW,
absolute_row: true,
column: column_right,
absolute_column: absolute_right,
}),
})
}
}
}
/// Consumes a range of references in R1C1 style like:
/// R12C3:R23C4, R[2]C[-2]:R[3]C[6], R3C[6]:R[-3]C4, R[-2]C:R[-2]C
pub(super) fn consume_range_r1c1(&mut self) -> Result<ParsedRange> {
// first let's try to parse a cell
match self.consume_reference_r1c1() {
Ok(cell) => {
if self.peek_char() == Some(':') {
// It's a range
self.position += 1;
if let Ok(cell2) = self.consume_reference_r1c1() {
Ok(ParsedRange {
left: cell,
right: Some(cell2),
})
} else {
Err(self.set_error("Expecting reference in range", self.position))
}
} else {
// just a reference
Ok(ParsedRange {
left: cell,
right: None,
})
}
}
Err(s) => Err(s),
}
}
/// Consumes a reference in R1C1 style like:
/// R12C3, R[2]C[-2], R3C[6], R[-3]C4, RC1, R[-2]C
pub(super) fn consume_reference_r1c1(&mut self) -> Result<ParsedReference> {
// R12C3, R[2]C[-2], R3C[6], R[-3]C4, RC1, R[-2]C
let absolute_column;
let absolute_row;
let position = self.position;
let row;
let column;
self.expect_char('R')?;
match self.peek_char() {
Some('[') => {
absolute_row = false;
self.expect_char('[')?;
let c = match self.read_next_char() {
Some(s) => s,
None => {
return Err(self.set_error("Expected column number", position));
}
};
match self.consume_integer(c) {
Ok(v) => row = v,
Err(_) => {
return Err(self.set_error("Expected row number", position));
}
}
self.expect(TokenType::RightBracket)?;
}
Some(c) => {
absolute_row = true;
self.expect_char(c)?;
match self.consume_integer(c) {
Ok(v) => row = v,
Err(_) => {
return Err(self.set_error("Expected row number", position));
}
}
}
None => {
return Err(self.set_error("Expected row number or '['", position));
}
}
self.expect_char('C')?;
match self.peek_char() {
Some('[') => {
self.expect_char('[')?;
absolute_column = false;
let c = match self.read_next_char() {
Some(s) => s,
None => {
return Err(self.set_error("Expected column number", position));
}
};
match self.consume_integer(c) {
Ok(v) => column = v,
Err(_) => {
return Err(self.set_error("Expected column number", position));
}
}
self.expect(TokenType::RightBracket)?;
}
Some(c) => {
absolute_column = true;
self.expect_char(c)?;
match self.consume_integer(c) {
Ok(v) => column = v,
Err(_) => {
return Err(self.set_error("Expected column number", position));
}
}
}
None => {
return Err(self.set_error("Expected column number or '['", position));
}
}
if let Some(c) = self.peek_char() {
if c.is_alphanumeric() {
return Err(self.set_error("Expected end of reference", position));
}
}
Ok(ParsedReference {
column,
row,
absolute_column,
absolute_row,
})
}
}