dmntk-feel-parser 0.1.0

/*
 * DMNTK - Decision Model and Notation Toolkit
 *
 * MIT license
 *
 * Copyright (c) 2018-2023 Dariusz Depta Engos Software
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Apache license, Version 2.0
 *
 * Copyright (c) 2018-2023 Dariusz Depta Engos Software
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//! Parser for `FEEL` language.

extern crate ascii_tree;
extern crate dmntk_feel;

mod ast;
mod closure;
mod context;
mod errors;
mod lalr;
mod lexer;
mod parser;
mod scope;

#[cfg(test)]
mod tests;

pub use ast::AstNode;
pub use closure::ClosureBuilder;
pub use scope::ParsingScope;

use crate::errors::*;
use crate::lalr::TokenType;
use crate::parser::Parser;
use dmntk_common::Result;
use dmntk_feel::{FeelScope, Name};

/// Parses an `expression` as defined in grammar rule `1`.
pub fn parse_expression(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartExpression, input, trace).parse()
}

/// Parses a `textual expression` as defined in grammar rule `2`.
pub fn parse_textual_expression(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartTextualExpression, input, trace).parse()
}

/// Parses `textual expressions` as defined in grammar rule `3`.
pub fn parse_textual_expressions(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartTextualExpressions, input, trace).parse()
}

/// Parses `unary tests` as defined in grammar rule `17`.
pub fn parse_unary_tests(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartUnaryTests, input, trace).parse()
}

/// Parses a `name` as defined grammar rule `25`.
pub fn parse_name(scope: &FeelScope, input: &str, trace: bool) -> Result<Name> {
  if let AstNode::Name(name) = Parser::new(&scope.into(), TokenType::StartTextualExpression, input, trace).parse()? {
    Ok(name)
  } else {
    Err(err_not_a_feel_name(input))
  }
}

/// Parses the `longest name` as defined in grammar rule `25`.
pub fn parse_longest_name(input: &str) -> Result<Name> {
  parse_name(&Default::default(), input, false)
}

/// Parses a `boxed expression` as defined in grammar rule `53`.
pub fn parse_boxed_expression(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartBoxedExpression, input, trace).parse()
}

/// Parses a `context` as defined in grammar rule `59`.
pub fn parse_context(scope: &FeelScope, input: &str, trace: bool) -> Result<AstNode> {
  Parser::new(&scope.into(), TokenType::StartContext, input, trace).parse()
}