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46 lines
1.7 KiB
Go
46 lines
1.7 KiB
Go
package postgresql
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import (
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"embed"
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"sync"
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"github.com/sqlc-dev/sqlc/internal/core"
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"github.com/sqlc-dev/sqlc/internal/core/seed"
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"github.com/sqlc-dev/sqlc/internal/sql/catalog"
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)
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// The dialect directory describes PostgreSQL's type system. Two things in it
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// are worth knowing about: the serial types are column definition sugar for an
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// integer plus a sequence, but they are what a schema declares, so the catalog
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// carries them as types of their own; and the numeric, string and datetime
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// categories are listed as mutually castable, which is what an unadorned
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// "WHERE bigint_col = 1" depends on.
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//
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// functions.jsonl and relations.jsonl are pg_catalog's functions and the
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// tables and views of pg_catalog and information_schema, all generated from
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// a live PostgreSQL 16 server by goldeneye (internal/goldeneye), which also
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// checks them against one. Both the analysis core and the catalog the legacy
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// compiler builds read them. Each contrib extension sqlc knows is a directory
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// under extensions/ holding the types and functions CREATE EXTENSION adds.
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//
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//go:embed dialect
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var dialectFS embed.FS
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// Dialect returns the catalog option that seeds PostgreSQL's type system.
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func Dialect() core.Option {
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return seed.Dialect(dialectFS, "dialect")
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}
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// pgCatalogFuncs is pg_catalog's functions in the form the catalog uses. The
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// list runs to thousands of entries and never changes within a run, so it is
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// read once.
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var pgCatalogFuncs = sync.OnceValue(func() []*catalog.Function {
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funcs, err := seed.Functions(dialectFS, "dialect")
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if err != nil {
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// The list is embedded in the binary: a failure here means sqlc was
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// built from a broken tree, which no caller can do anything about.
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panic(err)
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}
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return funcs
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})
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