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|
package pongo2
import (
"fmt"
"math"
)
type tagWidthratioNode struct {
position *Token
current, max IEvaluator
width IEvaluator
ctxName string
}
func (node *tagWidthratioNode) Execute(ctx *ExecutionContext, writer TemplateWriter) *Error {
current, err := node.current.Evaluate(ctx)
if err != nil {
return err
}
max, err := node.max.Evaluate(ctx)
if err != nil {
return err
}
width, err := node.width.Evaluate(ctx)
if err != nil {
return err
}
value := int(math.Ceil(current.Float()/max.Float()*width.Float() + 0.5))
if node.ctxName == "" {
writer.WriteString(fmt.Sprintf("%d", value))
} else {
ctx.Private[node.ctxName] = value
}
return nil
}
func tagWidthratioParser(doc *Parser, start *Token, arguments *Parser) (INodeTag, *Error) {
widthratioNode := &tagWidthratioNode{
position: start,
}
current, err := arguments.ParseExpression()
if err != nil {
return nil, err
}
widthratioNode.current = current
max, err := arguments.ParseExpression()
if err != nil {
return nil, err
}
widthratioNode.max = max
width, err := arguments.ParseExpression()
if err != nil {
return nil, err
}
widthratioNode.width = width
if arguments.MatchOne(TokenKeyword, "as") != nil {
// Name follows
nameToken := arguments.MatchType(TokenIdentifier)
if nameToken == nil {
return nil, arguments.Error("Expected name (identifier).", nil)
}
widthratioNode.ctxName = nameToken.Val
}
if arguments.Remaining() > 0 {
return nil, arguments.Error("Malformed widthratio-tag arguments.", nil)
}
return widthratioNode, nil
}
func init() {
RegisterTag("widthratio", tagWidthratioParser)
}
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