reader.go

Documentation: golang.org/x/arch/x86/x86csv

     1  // Copyright 2017 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package x86csv
     6  
     7  import (
     8  	"encoding/csv"
     9  	"io"
    10  )
    11  
    12  // A Reader reads entries from an "x86.csv" file.
    13  type Reader struct {
    14  	csv *csv.Reader
    15  }
    16  
    17  // NewReader returns a Reader reading from r, which should
    18  // be of the content of the "x86.csv" (format version=0.2).
    19  func NewReader(r io.Reader) *Reader {
    20  	rcsv := csv.NewReader(r)
    21  	rcsv.Comment = '#'
    22  	return &Reader{csv: rcsv}
    23  }
    24  
    25  // ReadAll reads all remaining rows from r.
    26  //
    27  // If error has occurred, still returns all rows
    28  // that have been read during method execution.
    29  //
    30  // A successful call returns err == nil, not err == io.EOF.
    31  // Because ReadAll is defined to read until EOF,
    32  // it does not treat end of file as an error to be reported.
    33  func (r *Reader) ReadAll() ([]*Inst, error) {
    34  	var err error
    35  	var insts []*Inst
    36  	for inst, err := r.Read(); err == nil; inst, err = r.Read() {
    37  		insts = append(insts, inst)
    38  	}
    39  	if err == io.EOF {
    40  		return insts, nil
    41  	}
    42  	return insts, err
    43  }
    44  
    45  // Read reads and returns the next Row from the "x86.csv" file.
    46  // If there is no data left to be read, Read returns {nil, io.EOF}.
    47  func (r *Reader) Read() (*Inst, error) {
    48  	cols, err := r.csv.Read()
    49  	if err != nil {
    50  		return nil, err
    51  	}
    52  
    53  	// This should be the only place where indexes
    54  	// are used. Everything else should rely on Row records.
    55  	inst := &Inst{
    56  		Intel:     cols[0],
    57  		Go:        cols[1],
    58  		GNU:       cols[2],
    59  		Encoding:  cols[3],
    60  		Mode32:    cols[4],
    61  		Mode64:    cols[5],
    62  		CPUID:     cols[6],
    63  		Tags:      cols[7],
    64  		Action:    cols[8],
    65  		Multisize: cols[9],
    66  		DataSize:  cols[10],
    67  	}
    68  	return inst, nil
    69  }
    70
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