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42 lines
912 B
42 lines
912 B
6 years ago
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package jstream
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import (
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"fmt"
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"strconv"
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)
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// Predefined errors
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var (
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ErrSyntax = SyntaxError{msg: "invalid character"}
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ErrUnexpectedEOF = SyntaxError{msg: "unexpected end of JSON input"}
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)
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type errPos [2]int // line number, byte offset where error occurred
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type SyntaxError struct {
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msg string // description of error
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context string // additional error context
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pos errPos
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atChar byte
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}
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func (e SyntaxError) Error() string {
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loc := fmt.Sprintf("%s [%d,%d]", quoteChar(e.atChar), e.pos[0], e.pos[1])
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return fmt.Sprintf("%s %s: %s", e.msg, e.context, loc)
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}
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// quoteChar formats c as a quoted character literal
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func quoteChar(c byte) string {
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// special cases - different from quoted strings
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if c == '\'' {
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return `'\''`
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}
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if c == '"' {
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return `'"'`
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}
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// use quoted string with different quotation marks
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s := strconv.Quote(string(c))
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return "'" + s[1:len(s)-1] + "'"
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}
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