mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-12 17:27:50 +08:00
176 lines
3.8 KiB
Go
176 lines
3.8 KiB
Go
package eval
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import (
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"bytes"
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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"unicode/utf8"
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"github.com/elves/elvish/pkg/eval/vals"
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"github.com/elves/elvish/pkg/util"
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)
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// String operations.
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// ErrInputOfEawkMustBeString is thrown when eawk gets a non-string input.
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var ErrInputOfEawkMustBeString = errors.New("input of eawk must be string")
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func init() {
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addBuiltinFns(map[string]interface{}{
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"<s": func(a, b string) bool { return a < b },
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"<=s": func(a, b string) bool { return a <= b },
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"==s": func(a, b string) bool { return a == b },
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"!=s": func(a, b string) bool { return a != b },
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">s": func(a, b string) bool { return a > b },
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">=s": func(a, b string) bool { return a >= b },
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"to-string": toString,
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"ord": ord,
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"chr": chr,
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"base": base,
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"wcswidth": util.Wcswidth,
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"-override-wcwidth": util.OverrideWcwidth,
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"has-prefix": strings.HasPrefix,
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"has-suffix": strings.HasSuffix,
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"joins": joins,
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"splits": splits,
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"replaces": replaces,
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"eawk": eawk,
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})
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}
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// toString converts all arguments to strings.
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func toString(fm *Frame, args ...interface{}) {
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out := fm.OutputChan()
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for _, a := range args {
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out <- vals.ToString(a)
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}
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}
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// joins joins all input strings with a delimiter.
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func joins(sep string, inputs Inputs) (string, error) {
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var buf bytes.Buffer
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var errJoin error
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first := true
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inputs(func(v interface{}) {
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if errJoin != nil {
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return
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}
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if s, ok := v.(string); ok {
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if first {
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first = false
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} else {
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buf.WriteString(sep)
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}
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buf.WriteString(s)
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} else {
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errJoin = fmt.Errorf("join wants string input, got %s", vals.Kind(v))
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}
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})
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return buf.String(), errJoin
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}
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type maxOpt struct{ Max int }
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func (o *maxOpt) SetDefaultOptions() { o.Max = -1 }
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// splits splits an argument strings by a delimiter and writes all pieces.
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func splits(fm *Frame, opts maxOpt, sep, s string) {
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out := fm.ports[1].Chan
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parts := strings.SplitN(s, sep, opts.Max)
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for _, p := range parts {
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out <- p
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}
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}
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func replaces(opts maxOpt, old, repl, s string) string {
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return strings.Replace(s, old, repl, opts.Max)
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}
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func ord(fm *Frame, s string) {
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out := fm.ports[1].Chan
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for _, r := range s {
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out <- "0x" + strconv.FormatInt(int64(r), 16)
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}
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}
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func chr(nums ...int) (string, error) {
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var b bytes.Buffer
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for _, num := range nums {
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if !utf8.ValidRune(rune(num)) {
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return "", fmt.Errorf("Invalid codepoint: %d", num)
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}
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b.WriteRune(rune(num))
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}
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return b.String(), nil
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}
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// ErrBadBase is thrown by the "base" builtin if the base is smaller than 2 or
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// greater than 36.
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var ErrBadBase = errors.New("bad base")
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func base(fm *Frame, b int, nums ...int) error {
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if b < 2 || b > 36 {
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return ErrBadBase
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}
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out := fm.ports[1].Chan
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for _, num := range nums {
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out <- strconv.FormatInt(int64(num), b)
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}
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return nil
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}
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var eawkWordSep = regexp.MustCompile("[ \t]+")
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// eawk takes a function. For each line in the input stream, it calls the
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// function with the line and the words in the line. The words are found by
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// stripping the line and splitting the line by whitespaces. The function may
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// call break and continue. Overall this provides a similar functionality to
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// awk, hence the name.
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func eawk(fm *Frame, f Callable, inputs Inputs) error {
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broken := false
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var err error
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inputs(func(v interface{}) {
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if broken {
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return
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}
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line, ok := v.(string)
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if !ok {
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broken = true
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err = ErrInputOfEawkMustBeString
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return
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}
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args := []interface{}{line}
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for _, field := range eawkWordSep.Split(strings.Trim(line, " \t"), -1) {
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args = append(args, field)
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}
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newFm := fm.fork("fn of eawk")
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// TODO: Close port 0 of newFm.
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ex := newFm.Call(f, args, NoOpts)
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newFm.Close()
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if ex != nil {
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switch Cause(ex) {
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case nil, Continue:
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// nop
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case Break:
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broken = true
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default:
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broken = true
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err = ex
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}
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}
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})
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return err
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}
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