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refactor: separation of json-stream-parser to own crate
This commit is contained in:
Per Stark
640
json-stream-parser/src/lib.rs
Normal file
640
json-stream-parser/src/lib.rs
Normal file
@@ -0,0 +1,640 @@
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// This code is based on the json-stream-rust library (https://github.com/json-stream/json-stream-rust)
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// Original code is MIT licensed
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// Modified to fix escape character handling in strings
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use serde_json::{json, Value};
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#[derive(Clone, Debug)]
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enum ObjectStatus {
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Ready,
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StringQuoteOpen(bool),
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StringQuoteClose,
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Scalar {
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value_so_far: Vec<char>,
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},
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ScalarNumber {
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value_so_far: Vec<char>,
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},
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StartProperty,
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KeyQuoteOpen {
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key_so_far: Vec<char>,
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escaped: bool,
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},
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KeyQuoteClose {
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key: Vec<char>,
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},
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Colon {
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key: Vec<char>,
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},
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ValueQuoteOpen {
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key: Vec<char>,
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escaped: bool,
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},
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ValueQuoteClose,
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ValueScalar {
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key: Vec<char>,
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value_so_far: Vec<char>,
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},
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Closed,
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}
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fn add_char_into_object(
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object: &mut Value,
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current_status: &mut ObjectStatus,
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current_char: char,
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) -> Result<(), String> {
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match (&*object, &*current_status, current_char) {
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// String escape handling
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(&Value::String(_), &ObjectStatus::StringQuoteOpen(true), '"') => {
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if let Value::String(str) = object {
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str.push('"');
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}
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*current_status = ObjectStatus::StringQuoteOpen(false);
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}
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(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), '"') => {
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*current_status = ObjectStatus::StringQuoteClose;
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}
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(&Value::String(_), &ObjectStatus::StringQuoteOpen(true), c) => {
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// Handle other escaped chars
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if let Value::String(str) = object {
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str.push('\\');
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str.push(c);
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}
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*current_status = ObjectStatus::StringQuoteOpen(false);
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}
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(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), '\\') => {
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*current_status = ObjectStatus::StringQuoteOpen(true);
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}
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(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), c) => {
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if let Value::String(str) = object {
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str.push(c);
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}
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}
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// Key escape handling
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(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: true, .. }, '"') => {
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if let ObjectStatus::KeyQuoteOpen {
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ref mut key_so_far, ..
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} = current_status
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{
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key_so_far.push('"');
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*current_status = ObjectStatus::KeyQuoteOpen {
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key_so_far: key_so_far.clone(),
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escaped: false,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, '"') => {
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if let ObjectStatus::KeyQuoteOpen { ref key_so_far, .. } = current_status {
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let key = key_so_far.iter().collect::<String>();
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if let Value::Object(obj) = object {
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obj.insert(key.clone(), Value::Null);
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}
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*current_status = ObjectStatus::KeyQuoteClose {
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key: key_so_far.clone(),
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: true, .. }, c) => {
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if let ObjectStatus::KeyQuoteOpen {
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ref mut key_so_far, ..
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} = current_status
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{
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key_so_far.push('\\');
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key_so_far.push(c);
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*current_status = ObjectStatus::KeyQuoteOpen {
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key_so_far: key_so_far.clone(),
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escaped: false,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, '\\') => {
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if let ObjectStatus::KeyQuoteOpen { ref key_so_far, .. } = current_status {
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*current_status = ObjectStatus::KeyQuoteOpen {
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key_so_far: key_so_far.clone(),
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escaped: true,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, c) => {
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if let ObjectStatus::KeyQuoteOpen {
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ref mut key_so_far, ..
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} = current_status
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{
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key_so_far.push(c);
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}
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}
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// Value string escape handling
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(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: true, .. }, '"') => {
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if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
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let key_str = key.iter().collect::<String>();
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if let Value::Object(obj) = object {
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if let Some(Value::String(value)) = obj.get_mut(&key_str) {
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value.push('"');
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}
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}
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*current_status = ObjectStatus::ValueQuoteOpen {
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key: key.clone(),
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escaped: false,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, '"') => {
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*current_status = ObjectStatus::ValueQuoteClose;
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}
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(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: true, .. }, c) => {
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if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
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let key_str = key.iter().collect::<String>();
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if let Value::Object(obj) = object {
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if let Some(Value::String(value)) = obj.get_mut(&key_str) {
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value.push('\\');
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value.push(c);
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}
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}
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*current_status = ObjectStatus::ValueQuoteOpen {
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key: key.clone(),
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escaped: false,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, '\\') => {
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if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
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*current_status = ObjectStatus::ValueQuoteOpen {
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key: key.clone(),
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escaped: true,
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};
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}
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}
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(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, c) => {
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if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
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let key_str = key.iter().collect::<String>();
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if let Value::Object(obj) = object {
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if let Some(Value::String(value)) = obj.get_mut(&key_str) {
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value.push(c);
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} else {
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return Err(format!("Invalid value type for key {}", key_str));
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}
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}
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}
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}
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// All other cases from the original implementation
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(&Value::Null, &ObjectStatus::Ready, '"') => {
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*object = json!("");
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*current_status = ObjectStatus::StringQuoteOpen(false);
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}
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(&Value::Null, &ObjectStatus::Ready, '{') => {
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*object = json!({});
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*current_status = ObjectStatus::StartProperty;
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}
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// ------ true ------
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(&Value::Null, &ObjectStatus::Ready, 't') => {
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*object = json!(true);
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*current_status = ObjectStatus::Scalar {
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value_so_far: vec!['t'],
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};
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}
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(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'r') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['t'] {
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value_so_far.push('r');
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}
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}
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}
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(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'u') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['t', 'r'] {
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value_so_far.push('u');
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}
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}
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}
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(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'e') => {
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*current_status = ObjectStatus::Closed;
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}
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// ------ false ------
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(&Value::Null, &ObjectStatus::Ready, 'f') => {
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*object = json!(false);
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*current_status = ObjectStatus::Scalar {
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value_so_far: vec!['f'],
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};
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}
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(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'a') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['f'] {
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value_so_far.push('a');
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}
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}
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}
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(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'l') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['f', 'a'] {
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value_so_far.push('l');
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}
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}
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}
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(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 's') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['f', 'a', 'l'] {
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value_so_far.push('s');
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}
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}
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}
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(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'e') => {
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*current_status = ObjectStatus::Closed;
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}
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// ------ null ------
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(&Value::Null, &ObjectStatus::Ready, 'n') => {
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*object = json!(null);
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*current_status = ObjectStatus::Scalar {
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value_so_far: vec!['n'],
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};
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}
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(&Value::Null, &ObjectStatus::Scalar { .. }, 'u') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['n'] {
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value_so_far.push('u');
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}
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}
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}
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(&Value::Null, &ObjectStatus::Scalar { .. }, 'l') => {
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if let ObjectStatus::Scalar {
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ref mut value_so_far,
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} = current_status
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{
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if *value_so_far == vec!['n', 'u'] {
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value_so_far.push('l');
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} else if *value_so_far == vec!['n', 'u', 'l'] {
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// This is for the second 'l' in "null"
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*current_status = ObjectStatus::Closed;
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}
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}
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}
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// ------ number ------
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(&Value::Null, &ObjectStatus::Ready, c @ '0'..='9') => {
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*object = Value::Number(c.to_digit(10).unwrap().into());
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*current_status = ObjectStatus::ScalarNumber {
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value_so_far: vec![c],
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};
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}
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(&Value::Null, &ObjectStatus::Ready, '-') => {
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*object = Value::Number(0.into());
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*current_status = ObjectStatus::ScalarNumber {
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value_so_far: vec!['-'],
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};
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}
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(&Value::Number(_), &ObjectStatus::ScalarNumber { .. }, c @ '0'..='9') => {
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if let ObjectStatus::ScalarNumber {
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ref mut value_so_far,
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} = current_status
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{
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value_so_far.push(c);
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// Parse based on whether it's a float or int
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if let Value::Number(ref mut num) = object {
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if value_so_far.contains(&'.') {
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let parsed_number = value_so_far
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.iter()
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.collect::<String>()
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.parse::<f64>()
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.unwrap();
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if let Some(json_number) = serde_json::Number::from_f64(parsed_number) {
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*num = json_number;
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}
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} else {
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let parsed_number = value_so_far
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.iter()
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.collect::<String>()
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.parse::<i64>()
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.unwrap();
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*num = parsed_number.into();
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}
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}
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}
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}
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(&Value::Number(_), &ObjectStatus::ScalarNumber { .. }, '.') => {
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if let ObjectStatus::ScalarNumber {
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ref mut value_so_far,
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} = current_status
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{
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value_so_far.push('.');
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}
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}
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// Object handling
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(&Value::Object(_), &ObjectStatus::StartProperty, '"') => {
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*current_status = ObjectStatus::KeyQuoteOpen {
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key_so_far: vec![],
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escaped: false,
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};
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}
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(&Value::Object(_), &ObjectStatus::KeyQuoteClose { .. }, ':') => {
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if let ObjectStatus::KeyQuoteClose { ref key } = current_status {
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*current_status = ObjectStatus::Colon { key: key.clone() };
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}
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}
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(&Value::Object(_), &ObjectStatus::Colon { .. }, ' ' | '\n') => {}
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(&Value::Object(_), &ObjectStatus::Colon { .. }, '"') => {
|
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if let ObjectStatus::Colon { ref key } = current_status {
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let key_str = key.iter().collect::<String>();
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if let Value::Object(obj) = object {
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obj.insert(key_str, json!(""));
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}
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*current_status = ObjectStatus::ValueQuoteOpen {
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key: key.clone(),
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escaped: false,
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};
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}
|
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}
|
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// ------ Add Scalar Value ------
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(&Value::Object(_), &ObjectStatus::Colon { .. }, char) => {
|
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if let ObjectStatus::Colon { ref key } = current_status {
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*current_status = ObjectStatus::ValueScalar {
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key: key.clone(),
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value_so_far: vec![char],
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};
|
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}
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}
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(&Value::Object(_), &ObjectStatus::ValueScalar { .. }, ',') => {
|
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if let ObjectStatus::ValueScalar {
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ref key,
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ref value_so_far,
|
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} = current_status
|
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{
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let key_str = key.iter().collect::<String>();
|
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let value_str = value_so_far.iter().collect::<String>();
|
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if let Value::Object(obj) = object {
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match value_str.parse::<Value>() {
|
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Ok(value) => {
|
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obj.insert(key_str, value);
|
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}
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Err(e) => return Err(format!("Invalid value for key {}: {}", key_str, e)),
|
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}
|
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}
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*current_status = ObjectStatus::StartProperty;
|
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}
|
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}
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(&Value::Object(_), &ObjectStatus::ValueScalar { .. }, '}') => {
|
||||
if let ObjectStatus::ValueScalar {
|
||||
ref key,
|
||||
ref value_so_far,
|
||||
} = current_status
|
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{
|
||||
let key_str = key.iter().collect::<String>();
|
||||
let value_str = value_so_far.iter().collect::<String>();
|
||||
if let Value::Object(obj) = object {
|
||||
match value_str.parse::<Value>() {
|
||||
Ok(value) => {
|
||||
obj.insert(key_str, value);
|
||||
}
|
||||
Err(e) => return Err(format!("Invalid value for key {}: {}", key_str, e)),
|
||||
}
|
||||
}
|
||||
*current_status = ObjectStatus::Closed;
|
||||
}
|
||||
}
|
||||
(&Value::Object(_), &ObjectStatus::ValueScalar { .. }, char) => {
|
||||
if let ObjectStatus::ValueScalar {
|
||||
ref mut value_so_far,
|
||||
..
|
||||
} = current_status
|
||||
{
|
||||
value_so_far.push(char);
|
||||
}
|
||||
}
|
||||
|
||||
// ------ Finished taking value ------
|
||||
(&Value::Object(_), &ObjectStatus::ValueQuoteClose, ',') => {
|
||||
*current_status = ObjectStatus::StartProperty;
|
||||
}
|
||||
(&Value::Object(_), &ObjectStatus::ValueQuoteClose, '}') => {
|
||||
*current_status = ObjectStatus::Closed;
|
||||
}
|
||||
|
||||
// ------ white spaces ------
|
||||
(_, _, ' ' | '\n') => {}
|
||||
|
||||
(val, st, c) => {
|
||||
return Err(format!(
|
||||
"Invalid character {} status: {:?} value: {:?}",
|
||||
c, st, val
|
||||
));
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// The rest of the code remains the same
|
||||
#[cfg(debug_assertions)]
|
||||
pub fn parse_stream(json_string: &str) -> Result<Value, String> {
|
||||
let mut out: Value = Value::Null;
|
||||
let mut current_status = ObjectStatus::Ready;
|
||||
for current_char in json_string.chars() {
|
||||
println!(
|
||||
"variables: {:?} {:?} {:?}",
|
||||
out,
|
||||
current_status.clone(),
|
||||
current_char.to_string()
|
||||
);
|
||||
if let Err(e) = add_char_into_object(&mut out, &mut current_status, current_char) {
|
||||
return Err(e);
|
||||
}
|
||||
}
|
||||
return Ok(out);
|
||||
}
|
||||
|
||||
#[cfg(not(debug_assertions))]
|
||||
pub fn parse_stream(json_string: &str) -> Result<Value, String> {
|
||||
let mut out: Value = Value::Null;
|
||||
let mut current_status = ObjectStatus::Ready;
|
||||
for current_char in json_string.chars() {
|
||||
if let Err(e) = add_char_into_object(&mut out, &mut current_status, current_char) {
|
||||
return Err(e);
|
||||
}
|
||||
}
|
||||
return Ok(out);
|
||||
}
|
||||
|
||||
pub struct JsonStreamParser {
|
||||
object: Value,
|
||||
current_status: ObjectStatus,
|
||||
}
|
||||
|
||||
impl JsonStreamParser {
|
||||
pub fn new() -> JsonStreamParser {
|
||||
JsonStreamParser {
|
||||
object: Value::Null,
|
||||
current_status: ObjectStatus::Ready,
|
||||
}
|
||||
}
|
||||
pub fn add_char(&mut self, current_char: char) -> Result<(), String> {
|
||||
add_char_into_object(&mut self.object, &mut self.current_status, current_char)
|
||||
}
|
||||
pub fn get_result(&self) -> &Value {
|
||||
&self.object
|
||||
}
|
||||
}
|
||||
|
||||
macro_rules! param_test {
|
||||
($($name:ident: $string:expr, $value:expr)*) => {
|
||||
$(
|
||||
mod $name {
|
||||
#[allow(unused_imports)]
|
||||
use super::{parse_stream, JsonStreamParser};
|
||||
#[allow(unused_imports)]
|
||||
use serde_json::{Value, json};
|
||||
|
||||
#[test]
|
||||
fn simple() {
|
||||
let string: &str = $string;
|
||||
let value: Value = $value;
|
||||
let result = parse_stream(&string);
|
||||
assert_eq!(result.unwrap(), value);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in string.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &value);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn object_single_key_value() {
|
||||
let string = $string;
|
||||
let value = $value;
|
||||
let raw_json = format!("{{\"key\": {}}}", string);
|
||||
let expected = json!({"key": value});
|
||||
let result = parse_stream(&raw_json);
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn object_multiple_key_value() {
|
||||
let string = $string;
|
||||
let value = $value;
|
||||
let raw_json = format!("{{\"key1\": {}, \"key2\": {}}}", string, string);
|
||||
let expected = json!({"key1": value, "key2": value});
|
||||
let result = parse_stream(&raw_json);
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn object_multiple_key_value_with_blank_1() {
|
||||
let string = $string;
|
||||
let value = $value;
|
||||
let raw_json = format!("{{ \"key1\": {}, \"key2\": {}}}", string, string);
|
||||
let expected = json!({"key1": value, "key2": value});
|
||||
let result = parse_stream(&raw_json);
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn object_multiple_key_value_with_blank_2() {
|
||||
let string = $string;
|
||||
let value = $value;
|
||||
let raw_json = format!("{{\"key1\": {}, \"key2\": {} }}", string, string);
|
||||
let expected = json!({"key1": value, "key2": value});
|
||||
let result = parse_stream(&raw_json);
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn object_multiple_key_value_with_blank_3() {
|
||||
let string = $string;
|
||||
let value = $value;
|
||||
let raw_json = format!("{{
|
||||
\"key1\": {} ,
|
||||
\"key2\": {}
|
||||
}}", string, string);
|
||||
let expected = json!({"key1": value, "key2": value});
|
||||
let result = parse_stream(&raw_json);
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
parser.add_char(c).unwrap();
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_escaped_quotes_in_objects() {
|
||||
let raw_json = r#"{"key with \"quotes\"": "value with \"quotes\""}"#;
|
||||
let expected = json!({"key with \"quotes\"": "value with \"quotes\""});
|
||||
|
||||
let result = parse_stream(raw_json);
|
||||
assert!(result.is_ok(), "Parse error: {:?}", result.err());
|
||||
assert_eq!(result.unwrap(), expected);
|
||||
|
||||
let mut parser = JsonStreamParser::new();
|
||||
for c in raw_json.chars() {
|
||||
assert!(parser.add_char(c).is_ok(), "Add char error");
|
||||
}
|
||||
assert_eq!(parser.get_result(), &expected);
|
||||
}
|
||||
}
|
||||
)*
|
||||
}
|
||||
}
|
||||
|
||||
param_test! {
|
||||
null: r#"null"#, Value::Null
|
||||
true_value: r#"true"#, Value::Bool(true)
|
||||
false_value: r#"false"#, Value::Bool(false)
|
||||
empty_string: r#""""#, Value::String("".to_string())
|
||||
single_character_string: r#""a""#, Value::String("a".to_string())
|
||||
string_with_spaces: r#""a b c""#, Value::String("a b c".to_string())
|
||||
string_with_space_at_end: r#""a b c ""#, Value::String("a b c ".to_string())
|
||||
string_with_space_at_start: r#"" a b c""#, Value::String(" a b c".to_string())
|
||||
string_with_space_at_start_and_end: r#"" a b c ""#, Value::String(" a b c ".to_string())
|
||||
number: r#"1234567890"#, Value::Number(1234567890.into())
|
||||
single_digit_number: r#"1"#, Value::Number(1.into())
|
||||
number_with_spaces_at_start: r#" 1234567890"#, Value::Number(1234567890.into())
|
||||
number_with_spaces_at_end: r#"1234567890 "#, Value::Number(1234567890.into())
|
||||
number_with_spaces_at_start_and_end: r#" 1234567890 "#, Value::Number(1234567890.into())
|
||||
negative_number: r#"-1234567890"#, Value::Number((-1234567890).into())
|
||||
negative_single_digit_number: r#"-1"#, Value::Number((-1).into())
|
||||
zero: r#"0"#, Value::Number(0.into())
|
||||
float: r#"123.456"#, Value::Number(serde_json::Number::from_f64(123.456).unwrap())
|
||||
negative_float: r#"-123.456"#, Value::Number(serde_json::Number::from_f64(-123.456).unwrap())
|
||||
escaped_quotes: r#""he said \"hello\"""#, Value::String(r#"he said "hello""#.to_string())
|
||||
}
|
||||
Reference in New Issue
Block a user