As a personal project, trying to learn Go(lang) by applying it to something, I am writing an EMCAScript/JavaScript "compiler"; all it will (initially) do is allow you to include other .js files.
Functionality aside, I am pulling my hair out trying to figure out the regexp
package. Here is the snippet that does not seem to be doing what I want it to:
// Note: "lines" is an array of strings.
var includeRegex, _ = regexp.Compile("^[ \t]*include[(]{1}\"([^\"]+)\"[)]{1};")
for _, line := range lines {
var isInclude = includeRegex.Match([]byte(line))
if isInclude {
var includeFile = includeRegex.FindString(line)
fmt.Println("INCLUDE", includeFile)
} else {
// ...
}
I have already stumbled across Go's subset of regular expressions, hence why the regex does not read as ^\s*include\("([^"]+)"\);
. I have already tested both the preferred, and the Go-style regex, in RegexPal, and both definitely work. The match just never seems to occurr; what am I doing wrong?
For what it's worth, the include()
statement I am trying to parse looks like so:
include("somefile.js");
EDIT: For what it's worth, I am keeping the code here.
This seems to work with the latest weekly
package main
import (
"fmt"
"log"
"regexp"
"strings"
)
func main() {
includeRegex, err := regexp.Compile(`^\s*include\("(\\\"|[^"])+"\);`)
if err != nil {
log.Fatal(err)
}
for _, line := range strings.Split(`
foo
include "abc.def"
include("file.js");
include "me\"to\""
include("please\"!\"");
nothing here
`, "
") {
if includeRegex.Match([]byte(line)) {
includeFile := includeRegex.FindString(line)
fmt.Println("INCLUDE", includeFile)
} else {
fmt.Printf("no match for \"%s\"
", line)
}
}
}
Output:
$ go build && ./tmp
no match for ""
no match for "foo"
no match for "include "abc.def""
INCLUDE include("file.js");
no match for " include "me\"to\"""
INCLUDE include("please\"!\"");
no match for " nothing here "
no match for ""
$
Try putting the following line at the start of your program:
println(runtime.Version())
It should print weekly.2012-03-13
or something close to that date.