87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package zclsyntax
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import (
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"bytes"
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"fmt"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/convert"
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"github.com/zclconf/go-zcl/zcl"
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)
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type TemplateExpr struct {
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Parts []Expression
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SrcRange zcl.Range
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}
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func (e *TemplateExpr) walkChildNodes(w internalWalkFunc) {
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for i, part := range e.Parts {
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e.Parts[i] = w(part).(Expression)
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}
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}
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func (e *TemplateExpr) Value(ctx *zcl.EvalContext) (cty.Value, zcl.Diagnostics) {
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buf := &bytes.Buffer{}
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var diags zcl.Diagnostics
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isKnown := true
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for _, part := range e.Parts {
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partVal, partDiags := part.Value(ctx)
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diags = append(diags, partDiags...)
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if partVal.IsNull() {
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diags = append(diags, &zcl.Diagnostic{
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Severity: zcl.DiagError,
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Summary: "Invalid template interpolation value",
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Detail: fmt.Sprintf(
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"The expression result is null. Cannot include a null value in a string template.",
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),
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Subject: part.Range().Ptr(),
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Context: &e.SrcRange,
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})
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continue
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}
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if !partVal.IsKnown() {
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// If any part is unknown then the result as a whole must be
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// unknown too. We'll keep on processing the rest of the parts
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// anyway, because we want to still emit any diagnostics resulting
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// from evaluating those.
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isKnown = false
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continue
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}
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strVal, err := convert.Convert(partVal, cty.String)
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if err != nil {
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diags = append(diags, &zcl.Diagnostic{
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Severity: zcl.DiagError,
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Summary: "Invalid template interpolation value",
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Detail: fmt.Sprintf(
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"Cannot include the given value in a string template: %s.",
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err.Error(),
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),
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Subject: part.Range().Ptr(),
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Context: &e.SrcRange,
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})
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continue
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}
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buf.WriteString(strVal.AsString())
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}
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if !isKnown {
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return cty.UnknownVal(cty.String), diags
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}
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return cty.StringVal(buf.String()), diags
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}
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func (e *TemplateExpr) Range() zcl.Range {
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return e.SrcRange
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}
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func (e *TemplateExpr) StartRange() zcl.Range {
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return e.Parts[0].StartRange()
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}
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