terraform/repl/format.go

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package repl
import (
"fmt"
"strconv"
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"strings"
"github.com/zclconf/go-cty/cty"
)
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// FormatValue formats a value in a way that resembles Terraform language syntax
// and uses the type conversion functions where necessary to indicate exactly
// what type it is given, so that equality test failures can be quickly
// understood.
func FormatValue(v cty.Value, indent int) string {
if !v.IsKnown() {
return "(known after apply)"
}
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if v.IsMarked() {
return "(sensitive)"
}
if v.IsNull() {
ty := v.Type()
switch {
case ty == cty.DynamicPseudoType:
return "null"
case ty == cty.String:
return "tostring(null)"
case ty == cty.Number:
return "tonumber(null)"
case ty == cty.Bool:
return "tobool(null)"
case ty.IsListType():
return fmt.Sprintf("tolist(null) /* of %s */", ty.ElementType().FriendlyName())
case ty.IsSetType():
return fmt.Sprintf("toset(null) /* of %s */", ty.ElementType().FriendlyName())
case ty.IsMapType():
return fmt.Sprintf("tomap(null) /* of %s */", ty.ElementType().FriendlyName())
default:
return fmt.Sprintf("null /* %s */", ty.FriendlyName())
}
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}
ty := v.Type()
switch {
case ty.IsPrimitiveType():
switch ty {
case cty.String:
if formatted, isMultiline := formatMultilineString(v, indent); isMultiline {
return formatted
}
return strconv.Quote(v.AsString())
case cty.Number:
bf := v.AsBigFloat()
return bf.Text('g', -1)
case cty.Bool:
if v.True() {
return "true"
} else {
return "false"
}
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}
case ty.IsObjectType():
return formatMappingValue(v, indent)
case ty.IsTupleType():
return formatSequenceValue(v, indent)
case ty.IsListType():
return fmt.Sprintf("tolist(%s)", formatSequenceValue(v, indent))
case ty.IsSetType():
return fmt.Sprintf("toset(%s)", formatSequenceValue(v, indent))
case ty.IsMapType():
return fmt.Sprintf("tomap(%s)", formatMappingValue(v, indent))
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}
// Should never get here because there are no other types
return fmt.Sprintf("%#v", v)
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}
func formatMultilineString(v cty.Value, indent int) (string, bool) {
str := v.AsString()
lines := strings.Split(str, "\n")
if len(lines) < 2 {
return "", false
}
// If the value is indented, we use the indented form of heredoc for readability.
operator := "<<"
if indent > 0 {
operator = "<<-"
}
// Default delimiter is "End Of Text" by convention
delimiter := "EOT"
OUTER:
for {
// Check if any of the lines are in conflict with the delimiter. The
// parser allows leading and trailing whitespace, so we must remove it
// before comparison.
for _, line := range lines {
// If the delimiter matches a line, extend it and start again
if strings.TrimSpace(line) == delimiter {
delimiter = delimiter + "_"
continue OUTER
}
}
// None of the lines match the delimiter, so we're ready
break
}
// Write the heredoc, with indentation as appropriate.
var buf strings.Builder
buf.WriteString(operator)
buf.WriteString(delimiter)
for _, line := range lines {
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
buf.WriteString(line)
}
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
buf.WriteString(delimiter)
return buf.String(), true
}
func formatMappingValue(v cty.Value, indent int) string {
var buf strings.Builder
count := 0
buf.WriteByte('{')
indent += 2
for it := v.ElementIterator(); it.Next(); {
count++
k, v := it.Element()
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
buf.WriteString(FormatValue(k, indent))
buf.WriteString(" = ")
buf.WriteString(FormatValue(v, indent))
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}
indent -= 2
if count > 0 {
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
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}
buf.WriteByte('}')
return buf.String()
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}
func formatSequenceValue(v cty.Value, indent int) string {
var buf strings.Builder
count := 0
buf.WriteByte('[')
indent += 2
for it := v.ElementIterator(); it.Next(); {
count++
_, v := it.Element()
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
buf.WriteString(FormatValue(v, indent))
buf.WriteByte(',')
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}
indent -= 2
if count > 0 {
buf.WriteByte('\n')
buf.WriteString(strings.Repeat(" ", indent))
}
buf.WriteByte(']')
return buf.String()
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}