Work on graph build and metarule matching.
This commit is contained in:
Daniel Jones
parent
f812efe3ad
commit
207e052372
4 changed files with 369 additions and 189 deletions
214
expand.go
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214
expand.go
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@ -0,0 +1,214 @@
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// String substitution and expansion.
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package main
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import (
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"strings"
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"unicode/utf8"
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)
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// Expand a word. This includes substituting variables and handling quotes.
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func expand(input string, vars map[string][]string, expandBackticks bool) string {
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expanded := make([]byte, 0)
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var i, j int
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for i = 0; i < len(input); {
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j = i + strings.IndexAny(input[i:], "\"'`$\\")
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if j < 0 {
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expanded = append(expanded, input[i:]...)
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break
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}
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expanded = append(expanded, input[i:j]...)
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c, w := utf8.DecodeRuneInString(input[j:])
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i = j + w
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var off int
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var out string
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switch c {
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case '\\':
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out, off = expandEscape(input[i:])
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case '"':
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out, off = expandDoubleQuoted(input[i:], vars, expandBackticks)
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case '\'':
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out, off = expandSingleQuoted(input[i:])
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case '`':
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if expandBackticks {
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out, off = expandBackQuoted(input[i:], vars)
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} else {
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out = input
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off = len(input)
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}
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case '$':
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out, off = expandSigil(input[i:], vars)
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}
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expanded = append(expanded, out...)
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i += off
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}
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return string(expanded)
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}
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// Expand following a '\\'
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func expandEscape(input string) (string, int) {
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c, w := utf8.DecodeRuneInString(input)
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return string(c), w
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}
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// Expand a double quoted string starting after a '\"'
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func expandDoubleQuoted(input string, vars map[string][]string, expandBackticks bool) (string, int) {
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// find the first non-escaped "
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j := 0
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for {
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j = strings.IndexAny(input[j:], "\"\\")
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if j < 0 {
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break
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}
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_, w := utf8.DecodeRuneInString(input[j:])
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j += w
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c, w := utf8.DecodeRuneInString(input[j:])
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j += w
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if c == '"' {
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return expand(input[:j], vars, expandBackticks), (j + w)
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}
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if c == '\\' {
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if j+w < len(input) {
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j += w
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_, w := utf8.DecodeRuneInString(input[j:])
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j += w
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} else {
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break
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}
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}
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}
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return input, len(input)
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}
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// Expand a single quoted string starting after a '\''
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func expandSingleQuoted(input string) (string, int) {
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j := strings.Index(input, "'")
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if j < 0 {
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return input, len(input)
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}
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return input[:j], (j + 1)
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}
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// Expand something starting with at '$'.
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func expandSigil(input string, vars map[string][]string) (string, int) {
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c, w := utf8.DecodeRuneInString(input)
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var offset int
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var varname string
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if c == '{' {
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j := strings.IndexRune(input[w:], '}')
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if j < 0 {
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return input, len(input)
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}
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varname = input[w:j]
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offset = j + 1
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} else {
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// try to match a variable name
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i := w
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j := i
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for j < len(input) {
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c, w = utf8.DecodeRuneInString(input)
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if !(isalpha(c) || c == '_' || (j > i && isdigit(c))) {
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break
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}
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j += w
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}
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if j > i {
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varname = input[i:j]
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} else {
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return input, len(input)
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}
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}
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if isValidVarName(varname) {
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varvals, ok := vars[varname]
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if ok {
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return strings.Join(varvals, " "), offset
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}
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}
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return input, len(input)
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}
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// Find and expand all sigils.
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func expandSigils(input string, vars map[string][]string) string {
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expanded := make([]byte, 0)
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for i := 0; i < len(input); {
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j := strings.IndexRune(input[i:], '$')
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if j < 0 {
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expanded = append(expanded, input[i:]...)
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break
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}
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ex, k := expandSigil(input[j+1:], vars)
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expanded = append(expanded, ex...)
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i = k
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}
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return string(expanded)
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}
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// Expand all unescaped '%' characters.
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func expandSuffixes(input string, stem string) string {
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expanded := make([]byte, 0)
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for i := 0; i < len(input); {
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j := strings.IndexAny(input[i:], "\\%")
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if j < 0 {
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expanded = append(expanded, input[i:]...)
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break
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}
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c, w := utf8.DecodeRuneInString(input[j:])
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if c == '%' {
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expanded = append(expanded, stem...)
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i += w
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} else {
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j += w
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c, w := utf8.DecodeRuneInString(input[j:])
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if c == '%' {
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expanded = append(expanded, '%')
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i = j + w
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}
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}
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}
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return string(expanded)
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}
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// TODO: expand RegexpRefs
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// Expand a backtick quoted string, by executing the contents.
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func expandBackQuoted(input string, vars map[string][]string) (string, int) {
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// TODO: expand sigils?
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j := strings.Index(input, "`")
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if j < 0 {
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return input, len(input)
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}
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output := executeRecipe("sh", nil, input[:j], false, false, true)
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return output, (j + 1)
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}
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70
mk.go
70
mk.go
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@ -1,25 +1,69 @@
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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)
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func main() {
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input, _ := ioutil.ReadAll(os.Stdin)
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// TEST LEXING
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//_, tokens := lex(string(input))
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//for t := range tokens {
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//fmt.Printf("%s %s\n", t.typ, t.val)
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//}
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// The maximum number of times an rule may be applied.
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const max_rule_cnt = 3
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// TEST PARSING
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rs := parse(string(input), "<stdin>")
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fmt.Println(rs)
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// TEST STRING EXPANSION
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//rules := &ruleSet{make(map[string][]string), make([]rule, 0)}
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//println(rules.expand("\"This is a quote: \\\"\""))
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func mk(rs *ruleSet, target string, dryrun bool) {
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// Build a graph
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// 1. Introduce special variables into the ruleSet
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}
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func mkError(msg string) {
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fmt.Fprintf(os.Stderr, "mk: %s\n", msg)
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os.Exit(1)
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}
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func main() {
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var mkfilepath string
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var dryrun bool
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flag.StringVar(&mkfilepath, "f", "mkfile", "use the given file as mkfile")
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flag.BoolVar(&dryrun, "n", false, "print commands without actually executing")
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flag.Parse()
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mkfile, err := os.Open(mkfilepath)
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if err != nil {
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mkError("no mkfile found")
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}
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input, _ := ioutil.ReadAll(mkfile)
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mkfile.Close()
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rs := parse(string(input), mkfilepath)
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targets := flag.Args()
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// build the first non-meta rule in the makefile, if none are given explicitly
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for i := range rs.rules {
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if !rs.rules[i].ismeta {
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for j := range rs.rules[i].targets {
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targets = append(targets, rs.rules[i].targets[j].spat)
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}
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}
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}
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if len(targets) == 0 {
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fmt.Println("mk: nothing to mk")
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return
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}
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for _, target := range targets {
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//fmt.Printf("building: %q\n", target)
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g := buildgraph(rs, target)
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g.visualize(os.Stdout)
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//mk(rs, target, dryrun)
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}
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}
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68
parse.go
68
parse.go
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@ -6,6 +6,8 @@ package main
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import (
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"fmt"
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"os"
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"regexp"
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"strings"
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)
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type parser struct {
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@ -50,7 +52,9 @@ type parserStateFun func(*parser, token) parserStateFun
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// Parse a mkfile, returning a new ruleSet.
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func parse(input string, name string) *ruleSet {
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rules := &ruleSet{make(map[string][]string), make([]rule, 0)}
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rules := &ruleSet{make(map[string][]string),
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make([]rule, 0),
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make(map[string][]int)}
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parseInto(input, name, rules)
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return rules
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}
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@ -155,14 +159,12 @@ func parseRedirInclude(p *parser, t token) parserStateFun {
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// Encountered a bare string at the beginning of the line.
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func parseAssignmentOrTarget(p *parser, t token) parserStateFun {
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fmt.Println("assignment or target")
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p.push(t)
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return parseEqualsOrTarget
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}
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// Consumed one bare string ot the beginning of the line.
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func parseEqualsOrTarget(p *parser, t token) parserStateFun {
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fmt.Println("equals or target")
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switch t.typ {
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case tokenAssign:
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return parseAssignment
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@ -220,7 +222,6 @@ func parseTargets(p *parser, t token) parserStateFun {
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// Consumed one or more strings followed by a first ':'.
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func parseAttributesOrPrereqs(p *parser, t token) parserStateFun {
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fmt.Println("attributes or prereqs")
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switch t.typ {
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case tokenNewline:
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return parseRecipe
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@ -239,7 +240,6 @@ func parseAttributesOrPrereqs(p *parser, t token) parserStateFun {
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// Targets and attributes and the second ':' have been consumed.
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func parsePrereqs(p *parser, t token) parserStateFun {
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fmt.Println("prereqs")
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switch t.typ {
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case tokenNewline:
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return parseRecipe
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@ -256,8 +256,6 @@ func parsePrereqs(p *parser, t token) parserStateFun {
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// An entire rule has been consumed.
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func parseRecipe(p *parser, t token) parserStateFun {
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fmt.Println("recipe")
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// Assemble the rule!
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r := rule{}
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@ -269,39 +267,73 @@ func parseRecipe(p *parser, t token) parserStateFun {
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for ; j < len(p.tokenbuf) && p.tokenbuf[j].typ != tokenColon; j++ {
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}
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// targets
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r.targets = make([]string, i)
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for k := 0; k < i; k++ {
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r.targets[k] = p.rules.expand(p.tokenbuf[k].val, true)
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}
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// rule has attributes
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// TODO: should we be expanding the attribute strings?
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if j < len(p.tokenbuf) {
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attribs := make([]string, j-i-1)
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for k := i + 1; k < j; k++ {
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attribs[k-i-1] = p.tokenbuf[k].val
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attribs[k-i-1] = expand(p.tokenbuf[k].val, p.rules.vars, true)
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}
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err := r.parseAttribs(attribs)
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if err != nil {
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msg := fmt.Sprintf("while reading a rule's attributes expected an attribute but found \"%c\".", err.found)
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p.basicErrorAtToken(msg, p.tokenbuf[i+1])
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}
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if r.attributes.regex {
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r.ismeta = true
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}
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} else {
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j = i
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}
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// targets
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r.targets = make([]pattern, i)
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for k := 0; k < i; k++ {
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targetstr := expand(p.tokenbuf[k].val, p.rules.vars, true)
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r.targets[k].spat = targetstr
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if r.attributes.regex {
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rpat, err := regexp.Compile(targetstr)
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if err != nil {
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msg := fmt.Sprintf("invalid regular expression: %q", err)
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p.basicErrorAtToken(msg, p.tokenbuf[k])
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}
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r.targets[k].rpat = rpat
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} else {
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idx := strings.IndexRune(targetstr, '%')
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if idx >= 0 {
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var left, right string
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if idx > 0 {
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left = regexp.QuoteMeta(targetstr[:idx])
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}
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if idx < len(targetstr) - 1 {
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right = regexp.QuoteMeta(targetstr[idx+1:])
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}
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patstr := fmt.Sprintf("^%s(.*)%s$", left, right)
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rpat, err := regexp.Compile(patstr)
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if err != nil {
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msg := fmt.Sprintf("error compiling suffix rule. This is a bug.", err)
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p.basicErrorAtToken(msg, p.tokenbuf[k])
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}
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r.targets[k].rpat = rpat
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r.targets[k].issuffix = true
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r.ismeta = true
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}
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}
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}
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// prereqs
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r.prereqs = make([]string, len(p.tokenbuf)-j-1)
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for k := j + 1; k < len(p.tokenbuf); k++ {
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r.prereqs[k-j-1] = p.rules.expand(p.tokenbuf[k].val, true)
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r.prereqs[k-j-1] = expand(p.tokenbuf[k].val, p.rules.vars, true)
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}
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if t.typ == tokenRecipe {
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r.recipe = p.rules.expand(t.val, false)
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r.recipe = t.val
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}
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p.rules.push(r)
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p.rules.add(r)
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p.clear()
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// the current token doesn't belong to this rule
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200
ruleset.go
200
ruleset.go
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@ -6,8 +6,8 @@ package main
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import (
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"fmt"
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"strings"
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"unicode/utf8"
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"regexp"
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)
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type attribSet struct {
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@ -26,15 +26,51 @@ type attribError struct {
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found rune
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}
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// target and rereq patterns
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type pattern struct {
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issuffix bool // is a suffix '%' rule, so we should define $stem.
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spat string // simple string pattern
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rpat *regexp.Regexp // non-nil if this is a regexp pattern
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}
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// Match a pattern, returning an array of submatches, or nil if it doesn'm
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// match.
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func (p *pattern) match(target string) []string {
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if p.rpat != nil {
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return p.rpat.FindStringSubmatch(target)
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}
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if target == p.spat {
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return make([]string, 0)
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}
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return nil
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}
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// A single rule.
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type rule struct {
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targets []string // non-empty array of targets
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targets []pattern // non-empty array of targets
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attributes attribSet // rule attributes
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prereqs []string // possibly empty prerequesites
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shell []string // command used to execute the recipe
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recipe string // recipe source
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command []string // command attribute
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ismeta bool // is this a meta rule
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}
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// A set of rules.
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type ruleSet struct {
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vars map[string][]string
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rules []rule
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// map a target to an array of indexes into rules
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targetrules map[string][]int
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}
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// Read attributes for an array of strings, updating the rule.
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func (r *rule) parseAttribs(inputs []string) *attribError {
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for i := 0; i < len(inputs); i++ {
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|
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@ -84,164 +120,18 @@ func (r *rule) parseAttribs(inputs []string) *attribError {
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return nil
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}
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type ruleSet struct {
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vars map[string][]string
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rules []rule
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}
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// Add a rule to the rule set.
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func (rs *ruleSet) push(r rule) {
|
||||
func (rs *ruleSet) add(r rule) {
|
||||
rs.rules = append(rs.rules, r)
|
||||
}
|
||||
|
||||
// Expand a word. This includes substituting variables and handling quotes.
|
||||
func (rs *ruleSet) expand(input string, expandBackticks bool) string {
|
||||
expanded := make([]byte, 0)
|
||||
var i, j int
|
||||
for i = 0; i < len(input); {
|
||||
j = i + strings.IndexAny(input[i:], "\"'`$\\")
|
||||
|
||||
if j < 0 {
|
||||
expanded = append(expanded, []byte(input[i:])...)
|
||||
break
|
||||
}
|
||||
|
||||
expanded = append(expanded, []byte(input[i:j])...)
|
||||
c, w := utf8.DecodeRuneInString(input[j:])
|
||||
i = j + w
|
||||
|
||||
var off int
|
||||
var out string
|
||||
switch c {
|
||||
case '\\':
|
||||
out, off = rs.expandEscape(input[i:])
|
||||
|
||||
case '"':
|
||||
out, off = rs.expandDoubleQuoted(input[i:], expandBackticks)
|
||||
|
||||
case '\'':
|
||||
out, off = rs.expandSingleQuoted(input[i:])
|
||||
|
||||
case '`':
|
||||
if expandBackticks {
|
||||
out, off = rs.expandBackQuoted(input[i:])
|
||||
} else {
|
||||
out = input
|
||||
off = len(input)
|
||||
}
|
||||
|
||||
case '$':
|
||||
out, off = rs.expandSigil(input[i:])
|
||||
}
|
||||
|
||||
expanded = append(expanded, []byte(out)...)
|
||||
i += off
|
||||
}
|
||||
|
||||
return string(expanded)
|
||||
}
|
||||
|
||||
// Expand following a '\\'
|
||||
func (rs *ruleSet) expandEscape(input string) (string, int) {
|
||||
c, w := utf8.DecodeRuneInString(input)
|
||||
return string(c), w
|
||||
}
|
||||
|
||||
// Expand a double quoted string starting after a '\"'
|
||||
func (rs *ruleSet) expandDoubleQuoted(input string, expandBackticks bool) (string, int) {
|
||||
// find the first non-escaped "
|
||||
j := 0
|
||||
for {
|
||||
j = strings.IndexAny(input[j:], "\"\\")
|
||||
if j < 0 {
|
||||
break
|
||||
}
|
||||
|
||||
_, w := utf8.DecodeRuneInString(input[j:])
|
||||
j += w
|
||||
|
||||
c, w := utf8.DecodeRuneInString(input[j:])
|
||||
j += w
|
||||
|
||||
if c == '"' {
|
||||
return rs.expand(input[:j], expandBackticks), (j + w)
|
||||
}
|
||||
|
||||
if c == '\\' {
|
||||
if j+w < len(input) {
|
||||
j += w
|
||||
_, w := utf8.DecodeRuneInString(input[j:])
|
||||
j += w
|
||||
} else {
|
||||
break
|
||||
k := len(rs.rules) - 1
|
||||
for i := range r.targets {
|
||||
if r.targets[i].rpat == nil {
|
||||
rs.targetrules[r.targets[i].spat] =
|
||||
append(rs.targetrules[r.targets[i].spat], k)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return input, len(input)
|
||||
}
|
||||
|
||||
// Expand a single quoted string starting after a '\''
|
||||
func (rs *ruleSet) expandSingleQuoted(input string) (string, int) {
|
||||
j := strings.Index(input, "'")
|
||||
if j < 0 {
|
||||
return input, len(input)
|
||||
}
|
||||
return input[:j], (j + 1)
|
||||
}
|
||||
|
||||
// Expand something starting with at '$'.
|
||||
func (rs *ruleSet) expandSigil(input string) (string, int) {
|
||||
c, w := utf8.DecodeRuneInString(input)
|
||||
var offset int
|
||||
var varname string
|
||||
if c == '{' {
|
||||
j := strings.Index(input[w:], "}")
|
||||
if j < 0 {
|
||||
return input, len(input)
|
||||
}
|
||||
|
||||
varname = input[w:j]
|
||||
offset = j + 1
|
||||
} else {
|
||||
// try to match a variable name
|
||||
i := w
|
||||
j := i
|
||||
for j < len(input) {
|
||||
c, w = utf8.DecodeRuneInString(input)
|
||||
if !(isalpha(c) || c == '_' || (j > i && isdigit(c))) {
|
||||
break
|
||||
}
|
||||
j += w
|
||||
}
|
||||
|
||||
if j > i {
|
||||
varname = input[i:j]
|
||||
} else {
|
||||
return input, len(input)
|
||||
}
|
||||
}
|
||||
|
||||
if isValidVarName(varname) {
|
||||
varvals, ok := rs.vars[varname]
|
||||
if ok {
|
||||
return strings.Join(varvals, " "), offset
|
||||
}
|
||||
}
|
||||
|
||||
return input, len(input)
|
||||
}
|
||||
|
||||
// Expand a backtick quoted string, by executing the contents.
|
||||
func (rs *ruleSet) expandBackQuoted(input string) (string, int) {
|
||||
j := strings.Index(input, "`")
|
||||
if j < 0 {
|
||||
return input, len(input)
|
||||
}
|
||||
|
||||
output := executeRecipe("sh", nil, input[:j], false, false, true)
|
||||
return output, (j + 1)
|
||||
}
|
||||
|
||||
func isValidVarName(v string) bool {
|
||||
for i := 0; i < len(v); {
|
||||
|
|
@ -286,7 +176,7 @@ func (rs *ruleSet) executeAssignment(ts []token) *assignmentError {
|
|||
// expanded variables
|
||||
vals := make([]string, len(ts)-1)
|
||||
for i := 0; i < len(vals); i++ {
|
||||
vals[i] = rs.expand(ts[i+1].val, true)
|
||||
vals[i] = expand(ts[i+1].val, rs.vars, true)
|
||||
}
|
||||
|
||||
rs.vars[assignee] = vals
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue