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package textutil
import (
"strings"
)
// SplitLinesBytes splits data into lines, handling both \n and \r\n endings.
// The returned slices share the underlying data array.
func SplitLinesBytes(data []byte) [][]byte {
var lines [][]byte
start := 0
for i := 0; i < len(data); i++ {
if data[i] == '\n' {
end := i
if end > start && data[end-1] == '\r' {
end--
}
lines = append(lines, data[start:end])
start = i + 1
}
}
// Handle last line if it doesn't end with newline
if start < len(data) {
lines = append(lines, data[start:])
}
return lines
}
// RenderTemplate performs simple {{var}} replacement in a template string.
func RenderTemplate(t string, vars map[string]string) string {
if t == "" || len(vars) == 0 {
return t
}
out := t
for k, v := range vars {
out = strings.ReplaceAll(out, "{{"+k+"}}", v)
}
return out
}
// StripCodeFences removes surrounding Markdown triple-backtick fences.
func StripCodeFences(s string) string {
t := strings.TrimSpace(s)
if t == "" {
return t
}
lines := strings.Split(t, "\n")
start := 0
for start < len(lines) && strings.TrimSpace(lines[start]) == "" {
start++
}
end := len(lines) - 1
for end >= 0 && strings.TrimSpace(lines[end]) == "" {
end--
}
if start >= len(lines) || end < 0 || start > end {
return t
}
first := strings.TrimSpace(lines[start])
last := strings.TrimSpace(lines[end])
if strings.HasPrefix(first, "```") && last == "```" && end > start {
inner := strings.Join(lines[start+1:end], "\n")
return inner
}
return t
}
// InstructionFromSelection extracts the first inline instruction and returns
// (instruction, cleanedSelection). It detects markers on the earliest position
// per line in precedence: strict ;text;, /* */, <!-- -->, //, #, --.
func InstructionFromSelection(sel string) (string, string) {
lines := strings.Split(sel, "\n")
for idx, line := range lines {
if instr, cleaned, ok := FindFirstInstructionInLine(line); ok && strings.TrimSpace(instr) != "" {
lines[idx] = cleaned
return instr, strings.Join(lines, "\n")
}
}
return "", sel
}
// FindFirstInstructionInLine returns (instruction, cleaned, ok) for a single line.
func FindFirstInstructionInLine(line string) (instr, cleaned string, ok bool) {
type cand struct {
start, end int
text string
}
cands := []cand{}
if t, l, r, ok := FindStrictInlineTag(line); ok {
cands = append(cands, cand{start: l, end: r, text: t})
}
if i := strings.Index(line, "/*"); i >= 0 {
if j := strings.Index(line[i+2:], "*/"); j >= 0 {
start := i
end := i + 2 + j + 2
text := strings.TrimSpace(line[i+2 : i+2+j])
cands = append(cands, cand{start: start, end: end, text: text})
}
}
if i := strings.Index(line, "<!--"); i >= 0 {
if j := strings.Index(line[i+4:], "-->"); j >= 0 {
start := i
end := i + 4 + j + 3
text := strings.TrimSpace(line[i+4 : i+4+j])
cands = append(cands, cand{start: start, end: end, text: text})
}
}
if i := strings.Index(line, "//"); i >= 0 {
cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+2:])})
}
if i := strings.Index(line, "#"); i >= 0 {
cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+1:])})
}
if i := strings.Index(line, "--"); i >= 0 {
cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+2:])})
}
if len(cands) == 0 {
return "", line, false
}
best := cands[0]
for _, c := range cands[1:] {
if c.start >= 0 && (best.start < 0 || c.start < best.start) {
best = c
}
}
cleaned = strings.TrimRight(line[:best.start]+line[best.end:], " \t")
return best.text, cleaned, true
}
// FindStrictInlineTag finds ;text; with no spaces after/before semicolons.
func FindStrictInlineTag(line string) (text string, left, right int, ok bool) {
for i := 0; i < len(line); i++ {
if line[i] != ';' {
continue
}
if i+1 < len(line) && line[i+1] == ' ' {
continue
}
for j := i + 1; j < len(line); j++ {
if line[j] == ';' {
if j-1 >= 0 && line[j-1] == ' ' {
continue
}
inner := strings.TrimSpace(line[i+1 : j])
if inner != "" {
return inner, i, j + 1, true
}
}
}
}
return "", -1, -1, false
}
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