This change begins to lay the groundwork for doing semantic analysis and lowering to the cloud target's representation. In particular: * Split the mu/schema package. There is now mu/ast which contains the core types and mu/encoding which concerns itself with JSON and YAML serialization. * Notably I am *not* yet introducing a second AST form. Instead, we will keep the parse tree and AST unified for the time being. I envision very little difference between them -- at least for now -- and so this keeps things simpler, at the expense of two downsides: 1) the trees will be mutable (which turns out to be a good thing for performance), and 2) some fields will need to be ignored during de/serialization. We can always revisit this later when and if the need to split them arises. * Add a binder phase. It is currently a no-op.
31 lines
741 B
Go
31 lines
741 B
Go
// Copyright 2016 Marapongo, Inc. All rights reserved.
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package diag
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// Pos represents a position in a file.
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type Pos struct {
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Ln int
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Col int
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}
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// EmptyPos may be used when no position is needed.
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var EmptyPos = Pos{0, 0}
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// IsEmpty returns true if the Pos information is missing.
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func (pos Pos) IsEmpty() bool {
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return pos.Ln == 0 && pos.Col == 0
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}
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// Location represents a region spanning two positions in a file.
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type Location struct {
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From Pos
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To Pos
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}
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// EmptyLocation may be used when no position information is available.
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var EmptyLocation = Location{EmptyPos, EmptyPos}
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// IsEmpty returns true if the Location information is missing.
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func (loc Location) IsEmpty() bool {
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return loc.From.IsEmpty() && loc.To.IsEmpty()
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}
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