mirror of https://github.com/databricks/cli.git
105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
package dyn
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import (
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"fmt"
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"maps"
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"slices"
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)
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// Pattern represents a matcher for paths in a [Value] configuration tree.
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// It is used by [MapByPattern] to apply a function to the values whose paths match the pattern.
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// Every [Path] is a valid [Pattern] that matches a single unique path.
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// The reverse is not true; not every [Pattern] is a valid [Path], as patterns may contain wildcards.
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type Pattern []patternComponent
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// A pattern component can visit a [Value] and recursively call into [visit] for matching elements.
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// Fixed components can match a single key or index, while wildcards can match any key or index.
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type patternComponent interface {
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visit(v Value, prefix Path, suffix Pattern, opts visitOptions) (Value, error)
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}
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// NewPattern returns a new pattern from the given components.
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// The individual components may be created with [Key], [Index], or [Any].
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func NewPattern(cs ...patternComponent) Pattern {
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return cs
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}
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// NewPatternFromPath returns a new pattern from the given path.
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func NewPatternFromPath(p Path) Pattern {
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cs := make(Pattern, len(p))
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for i, c := range p {
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cs[i] = c
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}
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return cs
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}
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// Append appends the given components to the pattern.
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func (p Pattern) Append(cs ...patternComponent) Pattern {
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out := make(Pattern, len(p)+len(cs))
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copy(out, p)
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copy(out[len(p):], cs)
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return out
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}
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type anyKeyComponent struct{}
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// AnyKey returns a pattern component that matches any key.
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func AnyKey() patternComponent {
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return anyKeyComponent{}
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}
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// This function implements the patternComponent interface.
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func (c anyKeyComponent) visit(v Value, prefix Path, suffix Pattern, opts visitOptions) (Value, error) {
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m, ok := v.AsMap()
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if !ok {
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return InvalidValue, fmt.Errorf("expected a map at %q, found %s", prefix, v.Kind())
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}
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m = maps.Clone(m)
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for key, value := range m {
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var err error
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nv, err := visit(value, append(prefix, Key(key)), suffix, opts)
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if err != nil {
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// Leave the value intact if the suffix pattern didn't match any value.
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if IsNoSuchKeyError(err) || IsIndexOutOfBoundsError(err) {
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continue
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}
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return InvalidValue, err
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}
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m[key] = nv
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}
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return NewValue(m, v.Location()), nil
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}
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type anyIndexComponent struct{}
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// AnyIndex returns a pattern component that matches any index.
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func AnyIndex() patternComponent {
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return anyIndexComponent{}
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}
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// This function implements the patternComponent interface.
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func (c anyIndexComponent) visit(v Value, prefix Path, suffix Pattern, opts visitOptions) (Value, error) {
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s, ok := v.AsSequence()
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if !ok {
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return InvalidValue, fmt.Errorf("expected a sequence at %q, found %s", prefix, v.Kind())
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}
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s = slices.Clone(s)
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for i, value := range s {
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var err error
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nv, err := visit(value, append(prefix, Index(i)), suffix, opts)
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if err != nil {
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// Leave the value intact if the suffix pattern didn't match any value.
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if IsNoSuchKeyError(err) || IsIndexOutOfBoundsError(err) {
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continue
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}
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return InvalidValue, err
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}
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s[i] = nv
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}
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return NewValue(s, v.Location()), nil
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}
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