93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
= Command Parsing
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Kakoune commands, either loaded from a script, or written in the command
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prompt are parsed according to the following rules:
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== Basic parsing
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- Commands are separated by `;` or end of lines
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- Words (command names and parameters) are separated by whitespaces
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== Quoted Strings
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If a word starts with `'`, `"` or `%X` with `X` a non nestable
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punctuation character it is parsed as a quoted string whose delimiter is,
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respectively, `'`, `"` or `X`.
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A quoted string contains every character (including whitespaces) until
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its closing delimiter. If its closing delimiter is doubled, then it is
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considered to be part of the string content as a single delimiter.
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Inside double quotes, `%`-strings are processed unless the `%` is escaped by
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doubling it. Double quotes inside these nested strings must still be escaped.
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No other escaping takes place in quoted strings.
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=== Quoted Strings Examples
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- `'foo'` contains *foo*
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- `foo'bar'` is read verbatim, so it contains *foo'bar'*
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- `foo%|bar|` is read verbatim, so it contains *foo%|bar|*.
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- `'foo''bar'` is a single word whose content is *foo'bar*
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- `"baz"""` is a single word whose content is *baz"*.
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- `%|foo||bar|` is a single word whose content is *foo|bar*.
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- `"foo %|""bar| %%,baz,"` is a single word whose content is *foo "bar %,baz,*.
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== Balanced Strings
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If a word starts with `%X` with `X` a nestable punctuation character (one
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of `(`, `[`, `{` and `<`), it is parsed as a balanced string whose closing
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delimiter is the matching character of its opening delimiter (respectively
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`)`, `]`, `}` and `>`).
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A balanced string contains every character (including whitespaces) until
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a closing delimiter is found, and opening and closing delimiters are
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balanced inside the string (each opening delimiter appearing inside the
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string have been closed by a matching closing delimiter).
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No other escaping takes place in balanced strings.
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=== Balanced Strings Examples
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- `%{foo}` contains *foo*
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- `%{foo\{bar}}` contains *foo\{bar}*
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- `foo%{bar}` contains *foo%{bar}*
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- `"foo %{bar}"` is a single word whose content is *foo bar*
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== Non Quoted words
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Other words are non-quoted. Non-quoted words end either on a whitespaces
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or a `;`.
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If they start with `\\` followed by `%`, `'` or `"`, then that leading
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`\\` is discarded.
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If a whitespace or `;` is preceded by `\\`, then the `\\` is discarded
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and the whitespace or `;` becomes part of the word. Any other `\\`
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is treated as a literal `\\`.
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== Typed Expansions
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Quoted and Balanced strings starting with `%` might have an optional
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alphabetic *expansion type* between the `%` and their delimiter (which
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is always a punctuation character). This *expansion type* defines how the
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string content is going to be expanded. Rules for expanding and escaping typed
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expansions are the same as for `%`-strings.
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- If the *expansion type* is empty, the string content is used verbatim.
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- If the *expansion type* is one of `sh`, `reg`, `opt`, `val` or `arg`,
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The string is expanded as described in <<expansions#,`:doc expansions`>>
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- For any other *expansion type* a parsing error is raised.
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