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December 15, 2015 22:39
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Yet another simple literate programming tool
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package main | |
import ( | |
"regexp" | |
"flag" | |
"bufio" | |
"fmt" | |
"os" | |
"io" | |
"strings" | |
) | |
func main() { | |
var sourceFile string | |
var docFile string | |
var parsingFile string | |
var defaultChunk string | |
flag.Usage = func() { | |
fmt.Fprintf(os.Stderr, "Usage of lit: lit [options] file-to-parse.w\n") | |
flag.PrintDefaults() | |
} | |
flag.StringVar(&defaultChunk, "default-chunk", "*", "Default program chunk") | |
flag.StringVar(&sourceFile, "src-out", "", "File to write source code") | |
flag.StringVar(&docFile, "doc-out", "", "File to write document") | |
flag.Parse() | |
if len(flag.Args()) > 0 { | |
parsingFile = flag.Arg(0) | |
} | |
if parsingFile == "" || (sourceFile == "" && docFile == "") { | |
flag.Usage() | |
os.Exit(0) | |
} | |
chunks, document := parseFile(parsingFile) | |
chunks = expandChunks(chunks) | |
if sourceFile != "" { | |
sourceOutput, err := os.Create(sourceFile) | |
defer sourceOutput.Close() | |
if err != nil { | |
panic(err) | |
} | |
sourceOutput.WriteString(chunks[defaultChunk]) | |
} | |
if docFile != "" { | |
docOutput, err := os.Create(docFile) | |
defer docOutput.Close() | |
if err != nil { | |
panic(err) | |
} | |
docOutput.WriteString(document) | |
} | |
} | |
func parseFile(fileName string) (map[string]string, string) { | |
f, err := os.Open(fileName) | |
if err != nil { | |
panic(err) | |
} | |
defer f.Close() | |
fileBuf := bufio.NewReader(f) | |
var ( | |
endOfChunkMatcher *regexp.Regexp | |
chunkMatcher *regexp.Regexp | |
regexpError error | |
) | |
chunkMatcher, regexpError = regexp.Compile("<<([^>]+)>>=") | |
if regexpError != nil { | |
panic(regexpError) | |
} | |
endOfChunkMatcher, regexpError = regexp.Compile("@") | |
if regexpError != nil { | |
panic(regexpError) | |
} | |
var document string | |
var chunkName string | |
var chunks = make(map[string]string) | |
var processLine = func(line string) { | |
if chunkName != "" { | |
chunks[chunkName] += line | |
} else { | |
document += line | |
} | |
} | |
for { | |
line, err := fileBuf.ReadString('\n') | |
if err == io.EOF { | |
processLine(line) | |
break | |
} else if err != nil { | |
panic(err) | |
} | |
var matches = chunkMatcher.FindStringSubmatch(line) | |
if matches != nil { | |
chunkName = matches[1] | |
chunks[chunkName] = "" | |
} else if matches = endOfChunkMatcher.FindStringSubmatch(line); matches != nil { | |
chunkName = "" | |
} else { | |
processLine(line) | |
} | |
} | |
return chunks, document | |
} | |
func expandChunks(chunks map[string]string) map[string]string { | |
var expandedChunks = make(map[string]string) | |
chunkMatcher, err := regexp.Compile("<<([^>]+)>>") | |
if err != nil { | |
panic(err) | |
} | |
var expandBody func(b string) string | |
expandBody = func(b string) string { | |
var newBody = b | |
submatches := chunkMatcher.FindAllStringSubmatch(b, -1) | |
if submatches != nil { | |
for _, matches := range submatches { | |
fullChunk, chunkName := matches[0], matches[1] | |
if chunks[chunkName] != "" { | |
newBody = strings.Replace(newBody, fullChunk, expandBody(chunks[chunkName]), -1) | |
} | |
} | |
} | |
return newBody | |
} | |
for name, body := range chunks { | |
expandedChunks[name] = expandBody(body) | |
} | |
return expandedChunks | |
} |
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