Trait wast::parser::Peek[−][src]

pub trait Peek {
    fn peek(cursor: Cursor<'_>) -> bool;
    fn display() -> &'static str;

    fn peek2(cursor: Cursor<'_>) -> bool { ... }
}

A trait for types which be used to “peek” to see if they’re the next token in an input stream of Parser.

Often when implementing Parse you’ll need to query what the next token in the stream is to figure out what to parse next. This Peek trait defines the set of types that can be tested whether they’re the next token in the input stream.

Implementations of Peek should only be present on types that consume exactly one token (not zero, not more, exactly one). Types implementing Peek should also typically implement Parse should also typically implement Parse.

See the documentation of Parser::peek for example usage.

Required methods

`fn peek(cursor: Cursor<'_>) -> bool`[src]

Tests to see whether this token is the first token within the Cursor specified.

Returns true if Parse for this type is highly likely to succeed failing no other error conditions happening (like an integer literal being too big).

`fn display() -> &'static str`[src]

Returns a human-readable name of this token to display when generating errors about this token missing.

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Provided methods

`fn peek2(cursor: Cursor<'_>) -> bool`[src]

The same as peek, except it checks the token immediately following the current token.

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Implementations on Foreign Types

`impl Peek for u8`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for u16`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for u32`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for u64`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i8`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i16`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i32`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i64`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for &[u8]`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for &str`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

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Implementors

`impl Peek for Index<'_>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for custom`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for name`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for after`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for alias`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for any`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for anyfunc`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for anyref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for arg`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for array`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_exhaustion`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_invalid`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_malformed`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_arithmetic_nan`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_arithmetic_nan_f32x4`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_arithmetic_nan_f64x2`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_canonical_nan`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_canonical_nan_f32x4`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_canonical_nan_f64x2`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_return_func`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_trap`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for assert_unlinkable`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for before`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for binary`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for block`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for catch`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for catch_all`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for code`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for data`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for dataref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for declare`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for delegate`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for do`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for elem`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for else`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for end`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for eq`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for eqref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for event`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for export`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for extern`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for externref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for f32`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for f32x4`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for f64`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for f64x2`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for field`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for first`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for func`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for funcref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for get`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for global`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i8`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i8x16`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i16`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i16x8`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i31`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i31ref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i32`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i32x4`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i64`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for i64x2`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for if`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for import`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for instance`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for instantiate`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for invoke`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for item`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for last`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for local`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for loop`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for memory`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for module`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for modulecode`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for mut`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for nan_arithmetic`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for nan_canonical`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for null`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for nullref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for offset`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for outer`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for param`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for parent`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for passive`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for quote`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for ref`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for ref_func`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for ref_null`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for register`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for result`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for rtt`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for shared`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for start`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for struct`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for table`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for then`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for try`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for type`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for unwind`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for v128`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for Id<'_>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for InlineExport<'_>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for InlineImport<'_>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl Peek for LParen`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for HeapType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for ValType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for FunctionType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for FunctionTypeNoNames<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for InstanceType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for ModuleType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a> Peek for RefType<'a>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a, K: Peek> Peek for ItemRef<'a, K>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

`impl<'a, K: Peek> Peek for IndexOrRef<'a, K>`[src]

`fn peek(cursor: Cursor<'_>) -> bool`[src]

`fn display() -> &'static str`[src]

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