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// RichValueRel - A module for creating the Excel richValueRel.xml file.
//
// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright 2022-2026, John McNamara, jmcnamara@cpan.org
use std::io::Cursor;
use crate::xmlwriter::{xml_declaration, xml_empty_tag, xml_end_tag, xml_start_tag};
pub struct RichValueRel {
pub(crate) writer: Cursor<Vec<u8>>,
pub(crate) num_embedded_images: u32,
}
impl RichValueRel {
// -----------------------------------------------------------------------
// Crate public methods.
// -----------------------------------------------------------------------
// Create a new RichValueRel struct.
pub(crate) fn new() -> RichValueRel {
let writer = Cursor::new(Vec::with_capacity(2048));
RichValueRel {
writer,
num_embedded_images: 0,
}
}
// -----------------------------------------------------------------------
// XML assembly methods.
// -----------------------------------------------------------------------
// Assemble and generate the XML file.
pub(crate) fn assemble_xml_file(&mut self) {
xml_declaration(&mut self.writer);
// Write the <richValueRels> element.
self.write_rich_value_rels();
// Close the final tag.
xml_end_tag(&mut self.writer, "richValueRels");
}
// Write the <richValueRels> element.
fn write_rich_value_rels(&mut self) {
let attributes = [
(
"xmlns",
"http://schemas.microsoft.com/office/spreadsheetml/2022/richvaluerel",
),
(
"xmlns:r",
"http://schemas.openxmlformats.org/officeDocument/2006/relationships",
),
];
xml_start_tag(&mut self.writer, "richValueRels", &attributes);
for index in 1..=self.num_embedded_images {
// Write the <rel> element.
self.write_rel(index);
}
}
// Write the <rel> element.
fn write_rel(&mut self, index: u32) {
let attributes = [("r:id", format!("rId{index}"))];
xml_empty_tag(&mut self.writer, "rel", &attributes);
}
}