Function parse_if

nodedb/src/control/planner/procedural/parser/statements.rs:128–162

`IF cond THEN ... [ELSIF cond THEN ...] [ELSE ...] END IF;`

(tokens: &[Token], pos: &mut usize)

/// `IF cond THEN ... [ELSIF cond THEN ...] [ELSE ...] END IF;`
fn parse_if(tokens: &[Token], pos: &mut usize) -> Result<Statement, ProceduralError> {
    *pos += 1;
    let condition = collect_sql_until(tokens, pos, &[Token::Then])?;
    expect_token(tokens, pos, &Token::Then)?;
    let then_block = super::parse_statements(tokens, pos)?;

    let mut elsif_branches = Vec::new();
    while matches!(tokens.get(*pos), Some(Token::Elsif)) {
        *pos += 1;
        let cond = collect_sql_until(tokens, pos, &[Token::Then])?;
        expect_token(tokens, pos, &Token::Then)?;
        let body = super::parse_statements(tokens, pos)?;
        elsif_branches.push(ElsIfBranch {
            condition: cond,
            body,
        });
    }

    let else_block = if matches!(tokens.get(*pos), Some(Token::Else)) {
        *pos += 1;
        Some(super::parse_statements(tokens, pos)?)
    } else {
        None
    };

    expect_token(tokens, pos, &Token::EndIf)?;
    skip_if(tokens, pos, &Token::Semicolon);

    Ok(Statement::If {
        condition,
        then_block,
        elsif_branches,
        else_block,
    })
}

/// `WHILE cond LOOP ... END LOOP;`
fn parse_while(tokens: &[Token], pos: &mut usize) -> Result<Statement, ProceduralError> {