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parser.go
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/
parser.go
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// Copyright 2017 Baliance. All rights reserved.
//
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting sales@baliance.com.
package formula
import (
"io"
"strings"
"github.com/qifengzhang007/gooxml"
)
//go:generate goyacc -l -o grammar.go grammar.y
type plex struct {
nodes chan *node
result Expression
}
func (f *plex) Lex(lval *yySymType) int {
//yyDebug = 3
yyErrorVerbose = true
n := <-f.nodes
if n != nil {
lval.node = n
return int(lval.node.token)
}
return 0
}
func (f *plex) Error(s string) {
gooxml.Log("parse error: %s", s)
}
func Parse(r io.Reader) Expression {
p := &plex{LexReader(r), nil}
yyParse(p)
return p.result
}
func ParseString(s string) Expression {
if s == "" {
return NewEmptyExpr()
}
return Parse(strings.NewReader(s))
}