71 lines
1.5 KiB
Plaintext
71 lines
1.5 KiB
Plaintext
#! GRAMMAR:
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#! * type ..... -> identifier
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#! * assignment -> :: | :=
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#! * literal .. -> int | float | string
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#! * expr ..... -> identifier | literal
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#! * decl ..... -> identifier [type] assignment expr
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#! * stmt ..... -> decl
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import "@std/debug"
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import "@source/lexer"
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@hide:file
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TokenId :: alias lexer.TokenId
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NodeId :: distinct u32
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ExtraId :: distinct u32
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NO_ID_NODE :: maxval!(NodeId)
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NO_ID_EXTRA :: maxval!(ExtraId)
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# unsafe access on its own; NodeKind serves as a the tag
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# that determines the variant.
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NodeData :: union {
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token_id TokenId
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node_id NodeId
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extra_id ExtraId
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}
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Node :: struct {
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kind NodeKind
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main_token TokenId
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data0 NodeData = NodeData{ node_id = NO_ID_NODE }
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data1 NodeData = NodeData{ node_id = NO_ID_NODE }
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}
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NodeKind :: enum {
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# LITERALS:
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# * main_token: token literal
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literal_int
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literal_float
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literal_string
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# IDENTIFIER EXPR:
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# * main_token: token literal
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expr_identifier
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expr_unary
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expr_binary
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# DECL:
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# * main_token: symbol name (identifier)
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# * data0: ExtraId
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# + extra[data0]: NodeId - type identifier node
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# + extra[data0 + 1]: NodeId - initializer expression
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# * data1: TokenId of either `::` or `:=` indicating mutability
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stmt_decl
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invalid
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}
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node_id proc(idx uint) NodeId {
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debug.assert(u64(idx) < u64(NO_ID_NODE))
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return NodeId(idx)
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}
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extra_id proc(idx uint) ExtraId {
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debug.assert(u64(idx) < u64(NO_ID_EXTRA))
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return ExtraId(idx)
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}
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