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go/constant: stringVal.String truncates final quotation mark #14261

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alandonovan opened this issue Feb 8, 2016 · 1 comment
Closed

go/constant: stringVal.String truncates final quotation mark #14261

alandonovan opened this issue Feb 8, 2016 · 1 comment
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@alandonovan
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% cat a.go
package main

import (
        "fmt"
        "go/token"
        "go/types"
        "log"
)

func main() {
        fset := token.NewFileSet()
        tv, err := types.Eval(fset, nil, 0, `"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"`)
        if err != nil {
                log.Fatal(err)
        }
        fmt.Println(tv.Value.String())
}

% go run a.go
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...
@griesemer
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This is working as intended: The output of value.String() may be shortened:

    // String returns a short, human-readable form of the value.
    // For numeric values, the result may be an approximation;
    // for String values the result may be a shortened string.
    // Use ExactString for a string representing a value exactly.
    String() string

The reason we print a shortened string w/o closing quote (e.g.: "xxxxx...) is so we can tell it apart from an actual (not shortened) string (here: "xxxxx...").

Use ExactString() to get the complete string. (i.e., String() is a short form for human readable output).

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@alandonovan @griesemer @gopherbot