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use crate::stats::types::{ElementType, ResultStats};
pub struct StatsParser;
impl StatsParser {
pub fn parse(result: &str) -> ResultStats {
let trimmed = result.trim();
if trimmed.is_empty() {
return ResultStats::Null;
}
if let Some(count) = Self::is_stream(trimmed) {
return ResultStats::Stream { count };
}
match trimmed.chars().next() {
Some('[') => {
let count = Self::count_array_items(trimmed);
let element_type = if count == 0 {
ElementType::Empty
} else {
Self::detect_element_type(trimmed)
};
ResultStats::Array {
count,
element_type,
}
}
Some('{') => ResultStats::Object,
Some('"') => ResultStats::String,
Some('t') | Some('f') => ResultStats::Boolean,
Some('n') => ResultStats::Null,
Some(c) if c.is_ascii_digit() || c == '-' => ResultStats::Number,
_ => ResultStats::Null,
}
}
fn count_array_items(result: &str) -> usize {
let mut depth = 0;
let mut comma_count = 0;
let mut in_string = false;
let mut escape_next = false;
let mut has_content = false;
for ch in result.chars() {
if escape_next {
escape_next = false;
continue;
}
if ch == '\\' && in_string {
escape_next = true;
continue;
}
if ch == '"' {
in_string = !in_string;
if depth == 1 {
has_content = true;
}
continue;
}
if in_string {
continue;
}
match ch {
'[' | '{' => {
if depth == 1 {
has_content = true;
}
depth += 1;
}
']' | '}' => {
depth -= 1;
}
',' => {
if depth == 1 {
comma_count += 1;
}
}
c if !c.is_whitespace() && depth == 1 => {
has_content = true;
}
_ => {}
}
}
if has_content { comma_count + 1 } else { 0 }
}
fn detect_element_type(result: &str) -> ElementType {
let mut depth = 0;
let mut in_string = false;
let mut escape_next = false;
let mut first_type: Option<ElementType> = None;
let mut elements_checked = 0;
const MAX_ELEMENTS_TO_CHECK: usize = 10;
let chars: Vec<char> = result.chars().collect();
let mut i = 0;
while i < chars.len() && elements_checked < MAX_ELEMENTS_TO_CHECK {
let ch = chars[i];
if escape_next {
escape_next = false;
i += 1;
continue;
}
if ch == '\\' && in_string {
escape_next = true;
i += 1;
continue;
}
if ch == '"' {
if depth == 1 && !in_string {
let element_type = ElementType::Strings;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Strings => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
in_string = !in_string;
i += 1;
continue;
}
if in_string {
i += 1;
continue;
}
match ch {
'[' => {
if depth == 1 {
let element_type = ElementType::Arrays;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Arrays => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
depth += 1;
}
'{' => {
if depth == 1 {
let element_type = ElementType::Objects;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Objects => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
depth += 1;
}
']' | '}' => {
depth -= 1;
}
't' | 'f' if depth == 1 => {
let element_type = ElementType::Booleans;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Booleans => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
'n' if depth == 1 => {
let element_type = ElementType::Nulls;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Nulls => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
c if (c.is_ascii_digit() || c == '-') && depth == 1 => {
let element_type = ElementType::Numbers;
match &first_type {
None => first_type = Some(element_type),
Some(t) if *t != ElementType::Numbers => return ElementType::Mixed,
_ => {}
}
elements_checked += 1;
}
_ => {}
}
i += 1;
}
first_type.unwrap_or(ElementType::Empty)
}
fn is_stream(result: &str) -> Option<usize> {
let mut count = 0;
let mut depth = 0;
let mut in_string = false;
let mut escape_next = false;
let mut in_value = false;
for ch in result.chars() {
if escape_next {
escape_next = false;
continue;
}
if ch == '\\' && in_string {
escape_next = true;
continue;
}
if ch == '"' {
if !in_string && depth == 0 && !in_value {
count += 1;
in_value = true;
}
in_string = !in_string;
continue;
}
if in_string {
continue;
}
match ch {
'[' | '{' => {
if depth == 0 && !in_value {
count += 1;
in_value = true;
}
depth += 1;
}
']' | '}' => {
depth -= 1;
if depth == 0 {
in_value = false;
}
}
't' | 'f' | 'n' if depth == 0 && !in_value => {
count += 1;
in_value = true;
}
c if (c.is_ascii_digit() || c == '-') && depth == 0 && !in_value => {
count += 1;
in_value = true;
}
c if c.is_whitespace() && depth == 0 => {
in_value = false;
}
_ => {}
}
}
if count > 1 { Some(count) } else { None }
}
}
#[cfg(test)]
#[path = "parser_tests.rs"]
mod parser_tests;