leo_errors/errors/parser/

parser_errors.rs

// Copyright (C) 2019-2026 Provable Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

use std::fmt::{Debug, Display};

create_messages!(
    /// ParserError enum that represents all the errors for the `leo-parser` crate.
    ParserError,
    code_mask: 0000i32,
    code_prefix: "PAR",

    /// For when the parser encountered an unexpected token.
    @formatted
    unexpected_token {
        args: (message: impl Display),
        msg: message,
        help: None,
    }

    /// For when the parser encountered an invalid address literal.
    @formatted
    invalid_address_lit {
        args: (token: impl Display),
        msg: format!("invalid address literal: '{token}'"),
        help: None,
    }

    /// For when the parser encountered an empty import list.
    @formatted
    invalid_import_list {
        args: (),
        msg: "Cannot import empty list",
        help: None,
    }

    /// For when the parser encountered an unexpected End of File.
    @formatted
    unexpected_eof {
        args: (),
        msg: "unexpected EOF",
        help: None,
    }

    /// For when the parser encountered an unexpected whitespace.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    unexpected_whitespace {
        args: (left: impl Display, right: impl Display),
        msg: format!("Unexpected white space between terms {left} and {right}"),
        help: None,
    }

    /// For when the parser encountered an unexpected list of tokens.
    @formatted
    unexpected {
        args: (found: impl Display, expected: impl Display),
        msg: format!("expected {expected} -- found '{found}'"),
        help: None,
    }

    /// For when the parser encountered a mix of commas and semi-colons in struct member variables.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    mixed_commas_and_semicolons {
        args: (),
        msg: "Cannot mix use of commas and semi-colons for struct member variable declarations.",
        help: None,
    }

    /// For when the parser encountered an unexpected identifier.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    unexpected_ident {
        args: (found: impl Display, expected: &[impl Display]),
        msg: format!(
            "unexpected identifier: expected {} -- found '{found}'",
            expected
                .iter()
                .map(|x| format!("'{x}'"))
                .collect::<Vec<_>>()
                .join(", "),
        ),
        help: None,
    }

    /// For when the parser encountered an unexpected statement.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    unexpected_statement {
        args: (found: impl Display, expected: impl Display),
        msg: format!("unexpected statement: expected '{expected}', found '{found}'"),
        help: None,
    }

    /// For when the parser encountered an unexpected string.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    unexpected_str {
        args: (found: impl Display, expected: impl Display),
        msg: format!("unexpected string: expected '{expected}', found '{found}'"),
        help: None,
    }

    /// For when the parser encountered an unexpected spread in an array init expression.
    @formatted
    spread_in_array_init {
        args: (),
        msg: "illegal spread in array initializer",
        help: None,
    }

    /// When more input was expected but not found.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_empty_input {
        args: (),
        msg: "Expected more characters to lex but found none.",
        help: None,
    }

    /// When an integer is started with a leading zero.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_expected_valid_escaped_char {
    args: (input: impl Display),
    msg: format!("Expected a valid escape character but found `{input}`."),
    help: None,
    }

    /// When a string is not properly closed.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_string_not_closed {
    args: (input: impl Display),
    msg: format!("Expected a closed string but found `{input}`."),
    help: None,
    }

    /// When a block comment is empty.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_empty_block_comment {
    args: (),
    msg: "Empty block comment.",
    help: None,
    }

    /// When a block comment is not closed before end of file.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_block_comment_does_not_close_before_eof {
    args: (input: impl Display),
    msg: format!("Block comment does not close with content: `{input}`."),
    help: None,
    }

    /// When the lexer could not lex some text.
    @backtraced
    could_not_lex {
    args: (input: impl Display),
    msg: format!("Could not lex the following content: `{input}`.\n"),
    help: None,
    }

    /// When the user tries to pass an implicit value.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    implicit_values_not_allowed {
        args: (input: impl Display),
        msg: format!("Could not parse the implicit value: {input}."),
        help: None,
    }

    /// When a hex number is provided.
    // TODO This error is unused. Remove it in a future version.
    @backtraced
    lexer_hex_number_provided {
        args: (input: impl Display),
        msg: format!("A hex number `{input}..` was provided but hex is not allowed."),
        help: None,
    }

    /// For when a user specified more than one mode on a parameter.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    inputs_multiple_variable_modes_specified {
        args: (),
        msg: "A parameter cannot have multiple modes.",
        help: Some("Consider using either `constant`, `public`, `private`, or none at all.".to_string()),
    }

    /// For when the lexer encountered a bidi override character
    @backtraced
    lexer_bidi_override {
        args: (),
        msg: "Unicode bidi override code point encountered.",
        help: None,
    }

    /// Parsed an unknown method call on the type of an expression.
    @formatted
    invalid_method_call {
        args: (expr: impl Display, func: impl Display, num_args: impl Display),
        msg: format!("The type of `{expr}` has no associated function `{func}` that takes {num_args} argument(s)."),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    invalid_associated_access {
        args: (name: impl Display),
        msg: format!("Invalid associated access call to struct {name}."),
        help: Some("Double colon `::` syntax is only supported for core functions in Leo for mainnet.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    leo_and_aleo_imports_only {
        args: (),
        msg: "Invalid import call to non-leo non-aleo file.",
        help: Some("Only imports of Leo `.leo` and Aleo `.aleo` files are currently supported.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    space_in_annotation {
        args: (),
        msg: "Illegal spacing in the annotation declaration.",
        help: Some("Remove whitespace between the `@` symbol and the identifier.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    circuit_is_deprecated {
        args: (),
        msg: "The keyword `circuit` is deprecated.",
        help: Some("Use `struct` instead.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    only_one_program_scope_is_allowed {
        args: (),
        msg: "Only one program scope is allowed in a Leo file.",
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    missing_program_scope {
        args: (),
        msg: "Missing a program scope in a Leo file.",
        help: Some("Add a program scope of the form: `program <name>.aleo { ... }` to the Leo file.".to_string()),
    }

    @formatted
    invalid_network {
        args: (),
        msg: "Invalid network identifier. The only supported identifier is `.aleo`.",
        help: None,
    }

    @formatted
    tuple_must_have_at_least_two_elements {
        args: (kind: impl Display),
        msg: format!("A tuple {kind} must have at least two elements."),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    async_finalize_is_deprecated {
        args: (),
        msg: format!("`async finalize` is deprecated."),
        help: Some("Use `return <expr> then finalize(<args>)` instead.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    finalize_statements_are_deprecated {
        args: (),
        msg: format!("`finalize` statements are deprecated."),
        help: Some("Use `return <expr> then finalize(<args>)` instead.".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    console_statements_are_not_yet_supported {
        args: (),
        msg: format!("`console` statements are not yet supported."),
        help: Some("Consider using `assert`, `assert_eq`, or `assert_neq` instead.".to_string()),
    }

    /// Enforce that tuple index must not have leading 0, or underscore in between digits
    // TODO This error is unused. Remove it in a future version.
    @formatted
    tuple_index_must_be_whole_number {
        args: (found: impl Display),
        msg: format!("expected no underscores or leading zeros -- found '{found}'"),
        help: None,
    }

    @formatted
    array_must_have_at_least_one_element {
        args: (kind: impl Display),
        msg: format!("An array {kind} must have at least one element."),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    invalid_external_type {
        args: (),
        msg: format!("Invalid external type."),
        help: Some("External type should have the form `<program>.aleo/<record>`. For example `bank.aleo/loan`".to_string()),
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    cannot_declare_external_struct {
        args: (),
        msg: format!("Cannot declare external struct."),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    external_type_cannot_be_used_inside_function {
        args: (program: impl Display, file_type: impl Display),
        msg: format!("External types cannot be used inside function (only as input/output types) -- found exported type from '{program}.{file_type}'."),
        help: None,
    }

    /// Enforce that cannot use import in program scope
    // TODO This error is unused. Remove it in a future version.
    @formatted
    cannot_import_inside_program_body {
        args: (),
        msg: format!("Cannot use import inside program body."),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    only_aleo_external_calls {
        args: (),
        msg: format!("Only external calls to `.aleo` programs are supported."),
        help: None,
    }

    @formatted
    cannot_define_external_record {
        args: (),
        msg: format!("Cannot create an external record. Records can only be created in the program that they are defined in."),
        help: None,
    }

    /// For when the parser encountered a member declaration not followed by a comma.
    // TODO This error is unused. Remove it in a future version.
    @formatted
    comma_expected_after_member {
        args: (),
        msg: "Each member declaration in a struct or record must be followed by a comma (except the last).",
        help: None,
    }

    @formatted
    hexbin_literal_nonintegers {
        args: (),
        msg: format!("Hex, octal, and binary literals may only be used for integer types."),
        help: None,
    }

    @backtraced
    wrong_digit_for_radix {
        args: (digit: char, radix: u32, token: String),
        msg: format!("Digit {digit} invalid in radix {radix} (token {token})."),
        help: None,
    }

    @formatted
    identifier_too_long {
        args: (ident: impl Display, length: usize, max_length: usize),
        msg: format!("Identifier {ident} is too long ({length} bytes; maximum is {max_length})"),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @formatted
    expected_identifier {
        args: (),
        msg: format!("Expected an identifier."),
        help: None,
    }

    @formatted
    identifier_cannot_contain_double_underscore {
        args : (ident: impl Display),
        msg: format!("Identifier {ident} cannot contain a double underscore `__`"),
        help: None,
    }

    @formatted
    custom {
        args: (msg: impl Display),
        msg: format!("{msg}"),
        help: None,
    }

    // TODO This error is unused. Remove it in a future version.
    @backtraced
    conflicting_module_definitions {
        args: (module_name: impl Display, file_a: impl Display, file_b: impl Display),
        msg: format!(
            "Module `{module_name}` is defined in both `{file_a}` and `{file_b}`"
        ),
        help: Some({
            let module_path_fs = format!("{module_name}").replace("::", "/");
            format!(
                "Use `{module_path_fs}.leo` for a simple module with no submodules, or place a `mod.leo` file in a `{module_path_fs}/` directory if it contains submodules — not both."
            )
        }),
    }

    @backtraced
    keyword_used_as_module_name {
        args: (module_name: impl Display, keyword: impl Display),
        msg: format!(
            "Module `{module_name}` uses the reserved keyword `{keyword}` as a name"
        ),
        help: {
            Some(format!(
                "Rename the module so it does not conflict with the language keyword `{keyword}`."
            ))
        },
    }

    @formatted
    could_not_lex_span {
    args: (input: impl Display),
    msg: format!("Could not lex the following content: `{input}`.\n"),
    help: None,
    }

    /// For when the lexer encountered a bidi override character
    @formatted
    lexer_bidi_override_span {
        args: (),
        msg: "Unicode bidi override code point encountered.",
        help: None,
    }

    @formatted
    wrong_digit_for_radix_span {
        args: (digit: char, radix: u32, token: impl Display),
        msg: format!("Digit {digit} invalid in radix {radix} (token {token})."),
        help: None,
    }

    @formatted
    identifier_cannot_start_with_underscore {
        args: (),
        msg: "Identifiers cannot start with an underscore.",
        help: Some("Identifiers must start with a letter.".to_string()),
    }
);