use crate::ast::{AstNode, NodeType};
use crate::error::Result;
use crate::formatters::base::{Formatter, FormatterOptions};
use crate::formatters::ssml::base::{
attrs_merge, format_attr_string_ordered, SsmlFormatterBase, TagAttrs, TagInfo,
};
pub struct GoogleAssistantSsmlFormatter {
base: SsmlFormatterBase,
options: FormatterOptions,
}
impl GoogleAssistantSsmlFormatter {
pub fn new(options: FormatterOptions) -> Self {
let base = SsmlFormatterBase::new(options.clone());
Self { base, options }
}
fn google_attribute_to_tag(&self, key: &str, value: &str) -> Option<TagInfo> {
let mut attributes: TagAttrs = Vec::new();
match key.to_lowercase().as_str() {
"whisper" => {
attributes.push(("volume".to_string(), "x-soft".to_string()));
attributes.push(("rate".to_string(), "slow".to_string()));
Some(("prosody".to_string(), attributes))
}
"excited" | "disappointed" => None,
"voice" | "lang" => None,
"ipa" => None,
"style" => {
if !value.is_empty() {
attributes.push(("name".to_string(), value.to_string()));
}
Some(("google:style".to_string(), attributes))
}
_ => self.base.attribute_to_tag(key, value),
}
}
fn format_google_text_modifier(&self, node: &AstNode) -> Result<String> {
let mut tags: Vec<TagInfo> = Vec::new();
let mut last_say_as: Option<TagInfo> = None;
let mut has_ipa = false;
let mut non_ipa_count = 0;
for key in &node.attribute_keys {
let value = match node.attributes.get(key) {
Some(v) => v,
None => continue,
};
if key.to_lowercase() == "ipa" {
has_ipa = true;
} else {
non_ipa_count += 1;
}
if let Some(tag_info) = self.google_attribute_to_tag(key, value) {
let tag_name = tag_info.0.clone();
if tag_name == "prosody" {
if let Some(existing) = tags.iter_mut().find(|(name, _)| name == "prosody") {
attrs_merge(&mut existing.1, tag_info.1);
continue;
}
}
if tag_name == "say-as" {
last_say_as = Some(tag_info);
continue;
}
tags.push(tag_info);
}
}
if has_ipa && non_ipa_count == 0 {
return Ok(node.text.clone());
}
if has_ipa {
if let Some(ipa_tag) = self
.base
.attribute_to_tag("ipa", node.attributes.get("ipa").unwrap_or(&String::new()))
{
tags.push(ipa_tag);
}
}
if let Some(say_as) = last_say_as {
tags.push(say_as);
}
if tags.is_empty() {
return Ok(node.text.clone());
}
self.base.apply_tags_to_text(&node.text, &tags)
}
fn format_google_section(&self, node: &AstNode) -> Result<String> {
let mut tags: Vec<TagInfo> = Vec::new();
for key in &node.attribute_keys {
let value = match node.attributes.get(key) {
Some(v) => v,
None => continue,
};
if let Some(tag_info) = self.google_attribute_to_tag(key, value) {
let tag_name = tag_info.0.clone();
if tag_name == "prosody" {
if let Some(existing) = tags.iter_mut().find(|(name, _)| name == "prosody") {
attrs_merge(&mut existing.1, tag_info.1);
continue;
}
}
tags.push(tag_info);
}
}
if tags.is_empty() {
return Ok(String::new());
}
let section_tag_order = ["voice", "lang", "prosody", "emphasis"];
tags.sort_by_key(|(tag_name, _)| {
section_tag_order
.iter()
.position(|t| t == tag_name)
.unwrap_or(usize::MAX)
});
let mut result = String::new();
for (i, (tag_name, attrs)) in tags.iter().enumerate() {
let attr_string = format_attr_string_ordered(tag_name, attrs);
if i > 0 {
result.push('\n');
}
if attr_string.is_empty() {
result.push_str(&format!("<{}>", tag_name));
} else {
result.push_str(&format!("<{} {}>", tag_name, attr_string));
}
}
Ok(result)
}
fn format_google_section_close(&self, node: &AstNode) -> Result<String> {
let mut tags: Vec<TagInfo> = Vec::new();
for key in &node.attribute_keys {
let value = match node.attributes.get(key) {
Some(v) => v,
None => continue,
};
if let Some(tag_info) = self.google_attribute_to_tag(key, value) {
let tag_name = tag_info.0.clone();
if tag_name == "prosody" {
if let Some(existing) = tags.iter_mut().find(|(name, _)| name == "prosody") {
attrs_merge(&mut existing.1, tag_info.1);
continue;
}
}
tags.push(tag_info);
}
}
let section_tag_order = ["voice", "lang", "prosody", "emphasis"];
tags.sort_by_key(|(tag_name, _)| {
section_tag_order
.iter()
.position(|t| t == tag_name)
.unwrap_or(usize::MAX)
});
if tags.is_empty() {
return Ok(String::new());
}
let mut result = String::new();
for (i, (tag_name, _)) in tags.iter().rev().enumerate() {
result.push_str(&format!("</{}>", tag_name));
if i < tags.len() - 1 {
result.push('\n');
}
}
Ok(result)
}
}
impl Formatter for GoogleAssistantSsmlFormatter {
fn format(&self, ast: &AstNode) -> Result<String> {
let mut content = String::new();
let mut children_iter = ast.children.iter().peekable();
while let Some(child) = children_iter.next() {
if child.node_type == NodeType::Section {
let mut section_content_raw = String::new();
while let Some(next_child) = children_iter.peek() {
if next_child.node_type == NodeType::Section {
break;
}
let next_child = children_iter.next().unwrap();
section_content_raw.push_str(&self.format_google_node(next_child)?);
}
let section_content = if let Some(stripped) = section_content_raw.strip_prefix('\n')
{
stripped
} else {
§ion_content_raw
};
let section_open = self.format_google_section(child)?;
let section_close = if !section_open.is_empty() {
self.format_google_section_close(child)?
} else {
String::new()
};
content.push_str(§ion_open);
if !section_open.is_empty() && section_content.starts_with('\n') {
content.push('\n');
}
let final_content = if section_open.is_empty() {
section_content.trim_start()
} else {
section_content
};
content.push_str(final_content);
content.push_str(§ion_close);
} else {
content.push_str(&self.format_google_node(child)?);
}
}
if self.options.include_speak_tag {
let content = content.trim_end_matches('\n');
Ok(format!("<speak>\n{}\n</speak>", content))
} else {
Ok(content)
}
}
fn format_node(&self, node: &AstNode) -> Result<String> {
self.format_google_node(node)
}
}
impl GoogleAssistantSsmlFormatter {
fn format_google_node(&self, node: &AstNode) -> Result<String> {
match node.node_type {
NodeType::PlainText => Ok(node.text.clone()),
NodeType::TextModifier => self.format_google_text_modifier(node),
_ => self.base.format_node_internal(node),
}
}
}