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textencoding: simplify code of IdentityEncoder

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This commit is contained in:
Denys Smirnov 2018-10-16 02:45:21 +03:00
parent 991aa2727a
commit d06cbae6c5
1 changed files with 16 additions and 19 deletions
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35
pdf/internal/textencoding/identity.go
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@ -7,8 +7,9 @@ package textencoding
import (
"fmt"
"strconv"
"strings"
"github.com/unidoc/unidoc/common"
"github.com/unidoc/unidoc/pdf/core"
)
@ -49,17 +50,11 @@ func (enc IdentityEncoder) CharcodeToGlyph(code uint16) (string, bool) {
// GlyphToCharcode returns the character code matching glyph `glyph`.
// The bool return flag is true if there was a match, and false otherwise.
func (enc IdentityEncoder) GlyphToCharcode(glyph string) (uint16, bool) {
// String with "uniXXXX" format where XXXX is the hexcode.
if len(glyph) == 7 && glyph[0:3] == "uni" {
var unicode uint16
n, err := fmt.Sscanf(glyph, "uni%X", &unicode)
if n == 1 && err == nil {
return enc.RuneToCharcode(rune(unicode))
}
r, ok := enc.GlyphToRune(glyph)
if !ok {
return 0, false
}
common.Log.Debug("Symbol encoding error: unable to find glyph->charcode entry (%s)", glyph)
return 0, false
return enc.RuneToCharcode(r)
}
// RuneToCharcode converts rune `r` to a PDF character code.
@ -77,7 +72,7 @@ func (enc IdentityEncoder) CharcodeToRune(code uint16) (rune, bool) {
// RuneToGlyph returns the glyph name for rune `r`.
// The bool return flag is true if there was a match, and false otherwise.
func (enc IdentityEncoder) RuneToGlyph(r rune) (string, bool) {
if r == 0x20 {
if r == ' ' {
return "space", true
}
glyph := fmt.Sprintf("uni%.4X", r)
@ -88,14 +83,16 @@ func (enc IdentityEncoder) RuneToGlyph(r rune) (string, bool) {
// The bool return flag is true if there was a match, and false otherwise.
func (enc IdentityEncoder) GlyphToRune(glyph string) (rune, bool) {
// String with "uniXXXX" format where XXXX is the hexcode.
if len(glyph) == 7 && glyph[0:3] == "uni" {
unicode := uint16(0)
n, err := fmt.Sscanf(glyph, "uni%X", &unicode)
if n == 1 && err == nil {
return rune(unicode), true
}
if glyph == "space" {
return ' ', true
} else if !strings.HasPrefix(glyph, "uni") || len(glyph) != 7 {
return 0, false
}
return 0, false
r, err := strconv.ParseUint(glyph[3:], 16, 16)
if err != nil {
return 0, false
}
return rune(r), true
}
// ToPdfObject returns a nil as it is not truly a PDF object and should not be attempted to store in file.