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https://github.com/unidoc/unioffice.git
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a5ef37c0bc
* evaluation errors fixed * allow underscores in sheet names * allow wildcard in *LOOKUP functions * horizontal and vertical ranges * horizontal and vertical ranges for sheet references * remove redundant recalculate * caching * fixed named ranges, made Evaluator more generic * Memory usage shown in flatten example * temporary file deleted * ParseCellReference duplicate removed * ISREF is fixed
55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
// Copyright 2017 FoxyUtils ehf. All rights reserved.
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//
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// Use of this source code is governed by the terms of the Affero GNU General
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// Public License version 3.0 as published by the Free Software Foundation and
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// appearing in the file LICENSE included in the packaging of this file. A
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// commercial license can be purchased on https://unidoc.io.
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package formula
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import "fmt"
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// defEval is the default formula evaluator which implements the Evaluator interface.
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type defEval struct {
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evCache
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lastEvalIsRef bool
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}
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// Eval evaluates and returns the result of a formula.
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func (d *defEval) Eval(ctx Context, formula string) Result {
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expr := ParseString(formula)
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if expr != nil {
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d.checkLastEvalIsRef(ctx, expr)
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result := expr.Eval(ctx, d)
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if result.Type == ResultTypeError {
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d.lastEvalIsRef = false
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}
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return result
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}
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return MakeErrorResult(fmt.Sprintf("unable to parse formula %s", formula))
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}
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// LastEvalIsRef returns if last evaluation with the evaluator was a reference.
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func (d *defEval) LastEvalIsRef() bool {
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return d.lastEvalIsRef
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}
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// checkLastEvalIsRef adds information which is needed for some functions but is lost after evaluation. E.g. which arguments are actually references.
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func (d *defEval) checkLastEvalIsRef(ctx Context, expr Expression) {
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switch expr.(type) {
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case FunctionCall:
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switch expr.(FunctionCall).name {
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case "ISREF":
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for _, arg := range expr.(FunctionCall).args {
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switch arg.(type) {
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case CellRef, Range, HorizontalRange, VerticalRange, NamedRangeRef, PrefixExpr, PrefixRangeExpr, PrefixHorizontalRange, PrefixVerticalRange:
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evResult := arg.Eval(ctx, d)
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d.lastEvalIsRef = !(evResult.Type == ResultTypeError && evResult.ValueString == "#NAME?")
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default:
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d.lastEvalIsRef = false
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}
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}
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}
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}
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}
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