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https://github.com/sjwhitworth/golearn.git
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db086a864e
Each method now ontains a -FromReader counterpart such that it'll allow use of those helper-methods even when someone does not have his data in a physical file. The original methods make use of those -FromReader methods. The reader is being reset (Seek(0, 0)) before every method- specific read, to ensure it's reading from the start of the reader. Test cases are not yet touched, and I'm not sure they should.
109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
package base
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import (
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"os"
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)
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// ParseCSVGetRows returns the number of rows in a given file.
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func ParseCSVGetRows(filepath string) (int, error) {
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f, err := os.Open(filepath)
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if err != nil {
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return 0, err
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}
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defer f.Close()
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return ParseCSVGetRowsFromReader(f)
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}
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// ParseCSVEstimateFilePrecision determines what the maximum number of
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// digits occuring anywhere after the decimal point within the file.
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func ParseCSVEstimateFilePrecision(filepath string) (int, error) {
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// Open the source file
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f, err := os.Open(filepath)
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if err != nil {
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return 0, err
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}
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defer f.Close()
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return ParseCSVEstimateFilePrecisionFromReader(f)
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}
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// ParseCSVGetAttributes returns an ordered slice of appropriate-ly typed
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// and named Attributes.
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func ParseCSVGetAttributes(filepath string, hasHeaders bool) []Attribute {
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f, err := os.Open(filepath)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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return ParseCSVGetAttributesFromReader(f, hasHeaders)
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}
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// ParseCSVSniffAttributeNames returns a slice containing the top row
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// of a given CSV file, or placeholders if hasHeaders is false.
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func ParseCSVSniffAttributeNames(filepath string, hasHeaders bool) []string {
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f, err := os.Open(filepath)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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return ParseCSVSniffAttributeNamesFromReader(f, hasHeaders)
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}
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// ParseCSVSniffAttributeTypes returns a slice of appropriately-typed Attributes.
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//
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// The type of a given attribute is determined by looking at the first data row
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// of the CSV.
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func ParseCSVSniffAttributeTypes(filepath string, hasHeaders bool) []Attribute {
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// Open file
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f, err := os.Open(filepath)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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return ParseCSVSniffAttributeTypesFromReader(f, hasHeaders)
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}
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// ParseCSVToInstances reads the CSV file given by filepath and returns
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// the read Instances.
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func ParseCSVToInstances(filepath string, hasHeaders bool) (instances *DenseInstances, err error) {
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// Open the file
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f, err := os.Open(filepath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return ParseCSVToInstancesFromReader(f, hasHeaders)
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}
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// ParseCSVToInstancesTemplated reads the CSV file given by filepath and returns
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// the read Instances, using another already read DenseInstances as a template.
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func ParseCSVToTemplatedInstances(filepath string, hasHeaders bool, template *DenseInstances) (instances *DenseInstances, err error) {
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// Open the file
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f, err := os.Open(filepath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return ParseCSVToTemplatedInstancesFromReader(f, hasHeaders, template)
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}
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// ParseCSVToInstancesWithAttributeGroups reads the CSV file given by filepath,
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// and returns the read DenseInstances, but also makes sure to group any Attributes
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// specified in the first argument and also any class Attributes specified in the second
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func ParseCSVToInstancesWithAttributeGroups(filepath string, attrGroups, classAttrGroups map[string]string, attrOverrides map[int]Attribute, hasHeaders bool) (instances *DenseInstances, err error) {
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// Open file
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f, err := os.Open(filepath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return ParseCSVToInstancesWithAttributeGroupsFromReader(f, attrGroups, classAttrGroups, attrOverrides, hasHeaders)
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}
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