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parser.go
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/
parser.go
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package makex
import (
"bytes"
"fmt"
"sort"
"strings"
)
// Parse parses a Makefile into a *Makefile struct.
//
// TODO(sqs): super hacky.
func Parse(data []byte) (*Makefile, error) {
var mf Makefile
lines := bytes.Split(data, []byte{'\n'})
var rule *BasicRule
for lineno, lineBytes := range lines {
line := string(lineBytes)
if strings.HasPrefix(line, "\t") {
if rule == nil {
return nil, fmt.Errorf("line %d: indented recipe not inside a rule", lineno)
}
recipe := strings.TrimPrefix(line, "\t")
recipe = ExpandAutoVars(rule, recipe)
rule.RecipeCmds = append(rule.RecipeCmds, recipe)
} else if strings.Contains(line, ":") {
sep := strings.Index(line, ":")
targets := strings.Fields(line[:sep])
if len(targets) > 1 {
return nil, errMultipleTargetsUnsupported(lineno)
}
target := targets[0]
prereqs := strings.Fields(line[sep+1:])
prereqs = uniqAndSort(prereqs)
rule = &BasicRule{TargetFile: target, PrereqFiles: prereqs}
mf.Rules = append(mf.Rules, rule)
} else {
rule = nil
}
}
return &mf, nil
}
func errMultipleTargetsUnsupported(lineno int) error {
return fmt.Errorf("line %d: rule with multiple targets is yet implemented", lineno)
}
func uniqAndSort(strs []string) []string {
sort.Strings(strs)
uniq := make([]string, 0, len(strs))
for i, s := range strs {
if i == 0 || strs[i-1] != s {
uniq = append(uniq, s)
}
}
return uniq
}