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    walt-syntax

    0.7.0 • Public • Published

    Walt Syntax

    Syntax definitions for the Walt, WebAssembly Alternative Syntax.

    Syntax

    Numbers

    • decimals 1, 20, 42
    • floating point 1.1
    • hex 0xFF

    Stings

    • character literals 'x'
    • words "hello world!"*

    *words require a memory to be present in the module

    Types

    • i32
    • i64
    • f32
    • f64
    • u32
    • u64

    Keywords

    Most JavaScript keywords are supported and have similar(when possible) semantics.

    • break
    • if
    • else
    • import
    • as
    • from
    • export
    • return
    • switch
    • case
    • default
    • const
    • let
    • for
    • continue
    • do
    • while
    • function

    Native

    Abstract Syntax Tree

    Syntax nodes are Plain Old JavaScript Objects.

    export type NodeType = {
      range: Marker[],
      Type: string,
      type: string | null,
      value: string,
      meta: { [string]: any },
      params: NodeType[],
    };
    

    Type is a pre-defined walt-specific string constant. For a full list of these constants, refer to the source. type(lowercase) is the WebAssembly type and must be one of i32 | f32 | i64 | f64 or the literal null value which represents a void value. Note: Any valid string could be the type value but only the 5 supported values above will compile.

    params are the children of the node.

    meta is used to hold information about the node which is not present in the source program and is either inferred or implied. For example a struct type definition may contain the key value offsets which are used to compile it's property look ups.

    Compile-able AST Types

    While many different nodes are possible a strict subset of node Type are considered valid by the generator and are compile-able.

      Syntax.Typedef,
      Syntax.Import,
      Syntax.Export,
      Syntax.FunctionDeclaration,
      Syntax.FunctionCall,
      Syntax.IndirectFunctionCall,
      Syntax.Constant,
      Syntax.BinaryExpression,
      Syntax.TernaryExpression,
      Syntax.IfThenElse,
      Syntax.Else,
      Syntax.Select,
      Syntax.Block,
      Syntax.Identifier,
      Syntax.FunctionIdentifier,
      Syntax.FunctionPointer,
      Syntax.ReturnStatement,
      Syntax.Declaration,
      Syntax.ArraySubscript,
      Syntax.Access,
      Syntax.Assignment,
      Syntax.MemoryAssignment,
      Syntax.Loop,
      Syntax.Break,
      Syntax.TypeCast,
      Syntax.Noop,
      Syntax.NativeMethod
    

    Install

    npm i walt-syntax

    DownloadsWeekly Downloads

    14

    Version

    0.7.0

    License

    MIT

    Unpacked Size

    34.6 kB

    Total Files

    10

    Last publish

    Collaborators

    • abuldauskas