78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
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package imap
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import "strings"
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// tokenize splits an IMAP command line into space-separated tokens, treating
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// "quoted strings" and (parenthesized lists) as single tokens (lists keep
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// their outer parens so command handlers can recognize and further split
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// them). Literal syntax ({n}\r\n<bytes>) is not handled here — see session.go's
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// readCommand, which handles literals as a pre-pass before tokenizing since
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// they require reading raw bytes off the connection, not just string scanning.
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func tokenize(line string) []string {
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var tokens []string
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i, n := 0, len(line)
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for i < n {
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for i < n && (line[i] == ' ' || line[i] == '\t') {
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i++
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}
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if i >= n {
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break
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}
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switch line[i] {
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case '"':
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j := i + 1
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var sb strings.Builder
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for j < n && line[j] != '"' {
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if line[j] == '\\' && j+1 < n {
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j++
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}
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sb.WriteByte(line[j])
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j++
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}
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tokens = append(tokens, sb.String())
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i = j + 1
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case '(':
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depth := 1
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j := i + 1
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for j < n && depth > 0 {
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switch line[j] {
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case '(':
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depth++
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case ')':
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depth--
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}
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j++
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}
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tokens = append(tokens, line[i:j])
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i = j
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default:
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j := i
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for j < n && line[j] != ' ' && line[j] != '\t' {
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j++
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}
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tokens = append(tokens, line[i:j])
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i = j
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}
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}
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return tokens
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}
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// splitList takes a token like "(FLAGS UID)" and returns its inner
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// space-separated items — used by FETCH/STORE argument parsing.
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func splitList(token string) []string {
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inner := strings.TrimPrefix(token, "(")
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inner = strings.TrimSuffix(inner, ")")
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if inner == "" {
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return nil
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}
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return tokenize(inner)
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}
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func isList(token string) bool {
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return strings.HasPrefix(token, "(") && strings.HasSuffix(token, ")")
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}
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