Function parse_gql

crates/gitql-parser/src/parser.rs:49–85

(tokens: Vec<Token>, env: &mut Environment)

use crate::type_checker::type_check_projection_symbols;

pub fn parse_gql(tokens: Vec<Token>, env: &mut Environment) -> Result<Vec<Query>, Box<Diagnostic>> {
    let mut queries: Vec<Query> = vec![];
    let mut position = 0;

    while position < tokens.len() {
        env.clear_session();

        let query = match &tokens[position].kind {
            TokenKind::Do => parse_do_query(env, &tokens, &mut position),
            TokenKind::Set => parse_set_query(env, &tokens, &mut position),
            TokenKind::Select => parse_select_query(env, &tokens, &mut position),
            TokenKind::Describe => parse_describe_query(env, &tokens, &mut position),
            TokenKind::Show => parse_show_query(&tokens, &mut position),
            _ => Err(un_expected_query_start_error(&tokens, &mut position)),
        }?;

        // Consume optional `;` at the end of valid statement
        if let Some(last_token) = tokens.get(position) {
            if last_token.kind == TokenKind::Semicolon {
                position += 1;
            }
        }

        queries.push(query);
    }

    // Check for unexpected content after valid statement
    if position < tokens.len() {
        return Err(un_expected_content_after_correct_query(
            &tokens[0].to_string(),
            &tokens,
            &mut position,
        ));
    }

    Ok(queries)
}

fn parse_do_query(
    env: &mut Environment,