116 lines
3.5 KiB
Go
116 lines
3.5 KiB
Go
package json
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import (
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"fmt"
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"io/ioutil"
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"os"
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"github.com/zclconf/go-zcl/zcl"
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)
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// Parse attempts to parse the given buffer as JSON and, if successful, returns
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// a zcl.File for the zcl configuration represented by it.
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//
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// This is not a generic JSON parser. Instead, it deals only with the profile
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// of JSON used to express zcl configuration.
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//
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// The returned file is valid only if the returned diagnostics returns false
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// from its HasErrors method. If HasErrors returns true, the file represents
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// the subset of data that was able to be parsed, which may be none.
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func Parse(src []byte, filename string) (*zcl.File, zcl.Diagnostics) {
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rootNode, diags := parseFileContent(src, filename)
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if _, ok := rootNode.(*objectVal); !ok {
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diags = diags.Append(&zcl.Diagnostic{
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Severity: zcl.DiagError,
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Summary: "Root value must be object",
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Detail: "The root value in a JSON-based configuration must be a JSON object.",
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Subject: rootNode.StartRange().Ptr(),
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})
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// Put in a placeholder objectVal just so the caller always gets
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// a valid file, even if it appears empty. This is useful for callers
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// that are doing static analysis of possibly-erroneous source code,
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// which will try to process the returned file even if we return
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// diagnostics of severity error. This way, they'll get a file that
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// has an empty body rather than a body that panics when probed.
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fakePos := zcl.Pos{
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Byte: 0,
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Line: 1,
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Column: 1,
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}
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fakeRange := zcl.Range{
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Filename: filename,
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Start: fakePos,
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End: fakePos,
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}
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rootNode = &objectVal{
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Attrs: map[string]*objectAttr{},
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SrcRange: fakeRange,
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OpenRange: fakeRange,
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}
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}
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file := &zcl.File{
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Body: &body{
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obj: rootNode.(*objectVal),
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},
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Bytes: src,
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Nav: navigation{rootNode.(*objectVal)},
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}
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return file, diags
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}
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// ParseFile is a convenience wrapper around Parse that first attempts to load
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// data from the given filename, passing the result to Parse if successful.
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//
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// If the file cannot be read, an error diagnostic with nil context is returned.
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func ParseFile(filename string) (*zcl.File, zcl.Diagnostics) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, zcl.Diagnostics{
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{
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Severity: zcl.DiagError,
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Summary: "Failed to open file",
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Detail: fmt.Sprintf("The file %q could not be opened.", filename),
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},
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}
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}
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defer f.Close()
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src, err := ioutil.ReadAll(f)
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if err != nil {
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return nil, zcl.Diagnostics{
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{
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Severity: zcl.DiagError,
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Summary: "Failed to read file",
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Detail: fmt.Sprintf("The file %q was opened, but an error occured while reading it.", filename),
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},
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}
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}
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return Parse(src, filename)
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}
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// ParseWithHIL is like Parse except the returned file will use the HIL
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// template syntax for expressions in strings, rather than the native zcl
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// template syntax.
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//
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// This is intended for providing backward compatibility for applications that
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// used to use HCL/HIL and thus had a JSON-based format with HIL
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// interpolations.
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func ParseWithHIL(src []byte, filename string) (*zcl.File, zcl.Diagnostics) {
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file, diags := Parse(src, filename)
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if file != nil && file.Body != nil {
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file.Body.(*body).useHIL = true
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}
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return file, diags
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}
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// ParseFileWithHIL is like ParseWithHIL but it reads data from a file before
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// parsing it.
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func ParseFileWithHIL(filename string) (*zcl.File, zcl.Diagnostics) {
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file, diags := ParseFile(filename)
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if file != nil && file.Body != nil {
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file.Body.(*body).useHIL = true
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}
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return file, diags
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}
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