autocomplete - Sublime Text 2 : trying to escape the dollar sign

Question

我试图在 Sublime 中定义一个按键绑定(bind)，让它自动配对美元符号“$”，就像它自动配对以下符号一样:

• “
• (
• [
• {
• '

我打开了默认的键盘映射文件并添加了以下代码:

// Auto-pair dollar signs
{ "keys": ["\$"], "command": "insert_snippet", "args": {"contents": "\$$0\$"}, "context":
    [
        { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
        { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
        { "key": "following_text", "operator": "regex_contains", "operand": "^(?:\t| |\\)|]|\\}|>|$)", "match_all": true },
        { "key": "preceding_text", "operator": "not_regex_contains", "operand": "[\$a-zA-Z0-9_]$", "match_all": true },
        { "key": "eol_selector", "operator": "not_equal", "operand": "string.quoted.double", "match_all": true }
    ]
},
{ "keys": ["\$"], "command": "insert_snippet", "args": {"contents": "\$${0:$SELECTION}\$"}, "context":
    [
        { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
        { "key": "selection_empty", "operator": "equal", "operand": false, "match_all": true }
    ]
},
{ "keys": ["\$"], "command": "move", "args": {"by": "characters", "forward": true}, "context":
    [
        { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
        { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
        { "key": "following_text", "operator": "regex_contains", "operand": "^\$", "match_all": true }
    ]
},
{ "keys": ["backspace"], "command": "run_macro_file", "args": {"file": "Packages/Default/Delete Left Right.sublime-macro"}, "context":
    [
        { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
        { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
        { "key": "preceding_text", "operator": "regex_contains", "operand": "\$$", "match_all": true },
        { "key": "following_text", "operator": "regex_contains", "operand": "^\$", "match_all": true }
    ]
},

注意转义的美元符号\$。在编辑器中，它们以红色突出显示，当我尝试保存文件时，收到无效转义错误消息。转义美元符号的正确方法是什么？

Answer 1

注意逃生

您将在这里经历两层编程。首先是 Python，然后是 JSON。所以，你的转义美元符号实际上需要转义两次:

"args": {"contents": "\\$$0\\$"}

Sublime Text 读取设置文件后，Python 会去掉第一个转义，留下以下 JSON 表示

"args": {"contents": "\$$0\$"}

然后，一旦 JSON 被解析，你最终会得到

"args": {"contents": "$$0$"}

不要逃避击键

您不需要在 keys 列表中转义 $。击键是一个字面上的美元符号，因此不需要转义

第一个设置应如下所示:

{ "keys": ["$"], "command": "insert_snippet", "args": {"contents": "\\$$0\\$"}, "context":
    [
        { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
        { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
        { "key": "following_text", "operator": "regex_contains", "operand": "^(?:\t| |\\)|]|\\}|>|$)", "match_all": true },
        { "key": "preceding_text", "operator": "not_regex_contains", "operand": "[\\$a-zA-Z0-9_]$", "match_all": true },
        { "key": "eol_selector", "operator": "not_equal", "operand": "string.quoted.double", "match_all": true }
    ]
},