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resolver.go
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resolver.go
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// Copyright 2015 ThoughtWorks, Inc.
// This file is part of Gauge.
// Gauge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Gauge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Gauge. If not, see <http://www.gnu.org/licenses/>.
package parser
import (
"fmt"
"regexp"
"strings"
"github.com/getgauge/common"
"github.com/getgauge/gauge/gauge"
"github.com/getgauge/gauge/gauge_messages"
"github.com/getgauge/gauge/util"
)
type invalidSpecialParamError struct {
message string
}
type resolverFn func(string) (*gauge.StepArg, error)
type specialTypeResolver struct {
predefinedResolvers map[string]resolverFn
}
type ParamResolver struct {
}
func (invalidSpecialParamError invalidSpecialParamError) Error() string {
return invalidSpecialParamError.message
}
func (paramResolver *ParamResolver) GetResolvedParams(step *gauge.Step, parent *gauge.Step, dataTableLookup *gauge.ArgLookup) []*gauge_messages.Parameter {
parameters := make([]*gauge_messages.Parameter, 0)
for _, arg := range step.Args {
parameter := new(gauge_messages.Parameter)
parameter.Name = arg.Name
if arg.ArgType == gauge.Static {
parameter.ParameterType = gauge_messages.Parameter_Static
parameter.Value = arg.Value
} else if arg.ArgType == gauge.Dynamic {
var resolvedArg *gauge.StepArg
if parent != nil {
resolvedArg = parent.GetArg(arg.Value)
} else {
resolvedArg = dataTableLookup.GetArg(arg.Value)
}
//In case a special table used in a concept, you will get a dynamic table value which has to be resolved from the concept lookup
parameter.Name = resolvedArg.Name
if resolvedArg.Table.IsInitialized() {
parameter.ParameterType = gauge_messages.Parameter_Special_Table
parameter.Table = paramResolver.createProtoStepTable(&resolvedArg.Table, dataTableLookup)
} else {
parameter.ParameterType = gauge_messages.Parameter_Dynamic
parameter.Value = resolvedArg.Value
}
} else if arg.ArgType == gauge.SpecialString {
parameter.ParameterType = gauge_messages.Parameter_Special_String
parameter.Value = arg.Value
} else if arg.ArgType == gauge.SpecialTable {
parameter.ParameterType = gauge_messages.Parameter_Special_Table
parameter.Table = paramResolver.createProtoStepTable(&arg.Table, dataTableLookup)
} else {
parameter.ParameterType = gauge_messages.Parameter_Table
parameter.Table = paramResolver.createProtoStepTable(&arg.Table, dataTableLookup)
}
parameters = append(parameters, parameter)
}
return parameters
}
func (resolver *ParamResolver) createProtoStepTable(table *gauge.Table, dataTableLookup *gauge.ArgLookup) *gauge_messages.ProtoTable {
protoTable := new(gauge_messages.ProtoTable)
protoTable.Headers = &gauge_messages.ProtoTableRow{Cells: table.Headers}
tableRows := make([]*gauge_messages.ProtoTableRow, 0)
if len(table.Columns) == 0 {
protoTable.Rows = tableRows
return protoTable
}
for i := 0; i < len(table.Columns[0]); i++ {
row := make([]string, 0)
for _, header := range table.Headers {
tableCell := table.Get(header)[i]
value := tableCell.Value
if tableCell.CellType == gauge.Dynamic {
//if concept has a table with dynamic cell, fetch from datatable
value = dataTableLookup.GetArg(tableCell.Value).Value
}
row = append(row, value)
}
tableRows = append(tableRows, &gauge_messages.ProtoTableRow{Cells: row})
}
protoTable.Rows = tableRows
return protoTable
}
func newSpecialTypeResolver() *specialTypeResolver {
resolver := new(specialTypeResolver)
resolver.predefinedResolvers = initializePredefinedResolvers()
return resolver
}
func initializePredefinedResolvers() map[string]resolverFn {
return map[string]resolverFn{
"file": func(filePath string) (*gauge.StepArg, error) {
fileContent, err := common.ReadFileContents(util.GetPathToFile(filePath))
if err != nil {
return nil, err
}
return &gauge.StepArg{Value: fileContent, ArgType: gauge.SpecialString}, nil
},
"table": func(filePath string) (*gauge.StepArg, error) {
csv, err := common.ReadFileContents(util.GetPathToFile(filePath))
if err != nil {
return nil, err
}
csvTable, err := convertCsvToTable(csv)
if err != nil {
return nil, err
}
return &gauge.StepArg{Table: *csvTable, ArgType: gauge.SpecialTable}, nil
},
}
}
func (resolver *specialTypeResolver) resolve(arg string) (*gauge.StepArg, error) {
if util.IsWindows() {
arg = GetUnescapedString(arg)
}
regEx := regexp.MustCompile("(.*?):(.*)")
match := regEx.FindAllStringSubmatch(arg, -1)
specialType := strings.TrimSpace(match[0][1])
value := strings.TrimSpace(match[0][2])
stepArg, err := resolver.getStepArg(specialType, value, arg)
if err == nil {
stepArg.Name = arg
}
return stepArg, err
}
func (resolver *specialTypeResolver) getStepArg(specialType string, value string, arg string) (*gauge.StepArg, error) {
resolveFunc, found := resolver.predefinedResolvers[specialType]
if found {
return resolveFunc(value)
}
return nil, invalidSpecialParamError{message: fmt.Sprintf("Resolver not found for special param <%s>", arg)}
}
// Creating a copy of the lookup and populating table values
func PopulateConceptDynamicParams(concept *gauge.Step, dataTableLookup *gauge.ArgLookup) {
//If it is a top level concept
if concept.Parent == nil {
lookup := concept.Lookup.GetCopy()
for key, _ := range lookup.ParamIndexMap {
conceptLookupArg := lookup.GetArg(key)
if conceptLookupArg.ArgType == gauge.Dynamic {
resolvedArg := dataTableLookup.GetArg(conceptLookupArg.Value)
lookup.AddArgValue(key, resolvedArg)
}
}
concept.Lookup = *lookup
}
//Updating values inside the concept step as well
newArgs := make([]*gauge.StepArg, 0)
for _, arg := range concept.Args {
if arg.ArgType == gauge.Dynamic {
if concept.Parent != nil {
newArgs = append(newArgs, concept.Parent.GetArg(arg.Value))
} else {
newArgs = append(newArgs, dataTableLookup.GetArg(arg.Value))
}
} else {
newArgs = append(newArgs, arg)
}
}
concept.Args = newArgs
concept.PopulateFragments()
}