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dotCooCoo
05c1be3548
New crate vectorcraft-js reads ECMAScript 5.1 source into a syntax tree with source positions: a UTF-16 lexer (line and column tracking, automatic semicolon insertion, the regexp and division goals), preprocessor lines read as directive tokens, a recursive-descent parser to an arena tree, and the ES5 early errors, strict mode included. Nesting deeper than Options::max_depth (200 by default) gives a SyntaxError with its line and column rather than overflowing the stack. Nothing runs scripts yet. cargo xtask test262 downloads test262 at a pinned commit, checks its SHA-256, unpacks it into the gitignored corpus/ folder and runs the ES5 syntax tests. A differential test in the engine compares the lexer with scriptcheck on line counts, directives and unterminated literals.
30 lines
1.1 KiB
Rust
30 lines
1.1 KiB
Rust
//! The error a script that cannot be read gives: a `SyntaxError` with its message and where in the
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//! source it is.
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use std::fmt;
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/// A script that does not follow the grammar, or breaks one of its early-error rules. `line` and
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/// `column` count from 1; the column counts UTF-16 code units from the start of the line, as
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/// JavaScript source positions do. `offset` is the UTF-16 offset from the start of the source.
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct SyntaxError {
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pub message: String,
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pub line: u32,
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pub column: u32,
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pub offset: u32,
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}
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impl fmt::Display for SyntaxError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "SyntaxError: {} (line {}, column {})", self.message, self.line, self.column)
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}
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}
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impl std::error::Error for SyntaxError {}
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/// The message of the error nesting deeper than [`crate::Options::max_depth`] gives.
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pub const TOO_DEEP: &str = "nesting too deep";
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/// The message of the error a source longer than [`crate::Options::max_source_units`] gives.
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pub const TOO_LONG: &str = "source too long";
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