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use std::collections::HashMap;
use super::{StringTemplaterError, StringTemplaterOptions};
/// Generate the template with options using translation and data.
pub fn generate(
template_str: &str,
translation: &HashMap<String, String>,
data: &HashMap<String, String>,
option: &StringTemplaterOptions,
) -> Result<String, StringTemplaterError> {
let mut result = String::new();
let mut chars = template_str.chars().peekable();
while let Some(c) = chars.next() {
match c {
'{' => {
if let Some('{') = chars.peek() {
chars.next();
let mut apply_template = false;
let mut pointer = false;
let mut inject = false;
let mut key = String::new();
// Templating
if let Some('{') = chars.peek() {
apply_template = true;
chars.next();
}
// Pointer
if let Some('*') = chars.peek() {
pointer = true;
chars.next();
if let Some('*') = chars.peek() {
inject = apply_template; // inject can only be true in a template
pointer = !apply_template; // If inject, then bye pointer
chars.next();
}
}
// Key looking
while let Some(&next) = chars.peek() {
if next == '}' {
break;
} else if next == '\\' {
chars.next();
match chars.peek() {
Some('*') => {
chars.next();
key.push('*');
}
Some('\\') => {
chars.next();
key.push('\\');
}
Some('{') => {
chars.next();
key.push('{');
}
Some('}') => {
chars.next();
key.push('}');
}
_ => key.push('\\'),
}
} else {
key.push(chars.next().unwrap());
}
}
// Error handling
if let Some('}') = chars.peek() {
chars.next();
} else if apply_template {
return Err(StringTemplaterError::MissingCurvyBracket(format!(
"Missing three curvy bracket `}}` around `{}`.",
key
)));
} else {
return Err(StringTemplaterError::MissingCurvyBracket(format!(
"Missing two curvy bracket `}}` around `{}`.",
key
)));
}
if let Some('}') = chars.peek() {
chars.next();
} else if apply_template {
return Err(StringTemplaterError::MissingCurvyBracket(format!(
"Missing two curvy bracket `}}` around `{}`.",
key
)));
} else {
return Err(StringTemplaterError::MissingCurvyBracket(format!(
"Missing one curvy bracket `}}` around `{}`.",
key
)));
}
if apply_template {
if let Some('}') = chars.peek() {
chars.next();
} else {
return Err(StringTemplaterError::MissingCurvyBracket(format!(
"Missing one curvy bracket `}}` around `{}`.",
key
)));
}
}
// Data handling
if apply_template {
if pointer {
if let Some(value) = data.get(&key) {
if let Some(value) = translation.get(value) {
match generate(value, translation, data, option) {
Ok(value) => {
result.push_str(&value);
}
Err(err) => return Err(err),
};
} else if option.safe_parse {
if option.display_missing_translations {
let patched_value =
option.override_missing_translations.as_ref();
let patched_value =
patched_value.map(|f| f(value)).unwrap_or(format!(
"[MISSING_TRANSLATION_KEY: `{}`]",
value
));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in translations.",
key
)));
}
} else if option.safe_parse {
if option.display_missing_keys {
let patched_value = option.override_missing_keys.as_ref();
let patched_value = patched_value
.map(|f| f(&key))
.unwrap_or(format!("[MISSING_DATA_KEY: `{}`]", key));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in data.",
key
)));
}
} else if inject {
if let Some(value) = data.get(&key) {
match generate(value, translation, data, option) {
Ok(value) => {
result.push_str(&value);
}
Err(err) => return Err(err),
};
} else if option.safe_parse {
if option.display_missing_keys {
let patched_value = option.override_missing_keys.as_ref();
let patched_value = patched_value
.map(|f| f(&key))
.unwrap_or(format!("[MISSING_DATA_KEY: `{}`]", key));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in data.",
key
)));
}
} else if let Some(value) = translation.get(&key) {
match generate(value, translation, data, option) {
Ok(value) => {
result.push_str(&value);
}
Err(err) => return Err(err),
};
} else if option.safe_parse {
if option.display_missing_translations {
let patched_value = option.override_missing_translations.as_ref();
let patched_value = patched_value
.map(|f| f(&key))
.unwrap_or(format!("[MISSING_TRANSLATION_KEY: `{}`]", key));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in translations.",
key
)));
}
} else {
// Not template
if pointer {
// Use the value of a data as a translation key
if let Some(value) = data.get(&key) {
if let Some(value) = translation.get(value) {
result.push_str(value);
} else if option.safe_parse {
if option.display_missing_translations {
let patched_value =
option.override_missing_translations.as_ref();
let patched_value =
patched_value.map(|f| f(value)).unwrap_or(format!(
"[MISSING_TRANSLATION_KEY: `{}`]",
value
));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in translations.",
key
)));
}
} else if option.safe_parse {
if option.display_missing_keys {
let patched_value = option.override_missing_keys.as_ref();
let patched_value = patched_value
.map(|f| f(&key))
.unwrap_or(format!("[MISSING_DATA_KEY: `{}`]", key));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in data.",
key
)));
}
} else if let Some(value) = data.get(&key) {
result.push_str(value);
} else if option.safe_parse {
if option.display_missing_keys {
let patched_value = option.override_missing_keys.as_ref();
let patched_value = patched_value
.map(|f| f(&key))
.unwrap_or(format!("[MISSING_DATA_KEY: `{}`]", key));
result.push_str(&patched_value);
}
} else {
return Err(StringTemplaterError::UnknownField(format!(
"The field `{}` does not exist in data.",
key
)));
}
}
} else {
result.push('{');
}
}
'\\' => {
if let Some(&next) = chars.peek() {
if next == '{' {
chars.next();
result.push('{');
} else if next == '}' {
chars.next();
result.push('}');
} else if next == '\\' {
chars.next();
result.push(c);
} else {
result.push(c);
}
} else {
result.push(c);
}
}
_ => result.push(c),
};
}
Ok(result)
}