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parser.go
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/
parser.go
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package svg
import (
"strconv"
)
func parseDAttr(in chan token) ([]svgCmd, error) {
var cmds []svgCmd
tmp := new(svgCmd)
tok, ok := <-in
for ok {
switch tok.typ {
case bad:
// ignore for now
case num:
f, err := strconv.ParseFloat(string(tok.text), 64)
if err != nil {
return nil, err
}
tmp.args = append(tmp.args, f)
case op:
if len(tmp.args) > 0 {
cmds = append(cmds, *tmp)
tmp.args = nil
val := parseCmd(tok.text)
if val != repeat {
tmp.op = val
}
if tmp.op == zAbs || tmp.op == zRel {
cmds = append(cmds, *tmp)
}
} else {
tmp.op = parseCmd(tok.text)
}
}
tok, ok = <-in
}
if len(tmp.args) > 0 {
cmds = append(cmds, *tmp)
}
return cmds, nil
}
func parsePointsAttr(in chan token) ([]svgCmd, error) {
var coords []float64
tok, ok := <-in
for ok {
if tok.typ == num {
f, err := strconv.ParseFloat(string(tok.text), 64)
if err != nil {
return nil, err
}
coords = append(coords, f)
}
tok, ok = <-in
}
cmds := make([]svgCmd, len(coords)/2)
for i, j := 0, 0; i < len(cmds); i, j = i+1, j+2 {
cmds[i].op = lAbs
cmds[i].args = []float64{coords[j], coords[j+1]}
}
cmds[0].op = mAbs
cmds = append(cmds, svgCmd{op: zAbs})
return cmds, nil
}