81 lines
3.2 KiB
CoffeeScript
81 lines
3.2 KiB
CoffeeScript
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Pattern = require './Pattern'
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# Escaper encapsulates escaping rules for single
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# and double-quoted YAML strings.
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class Escaper
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# Mapping arrays for escaping a double quoted string. The backslash is
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# first to ensure proper escaping.
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@LIST_ESCAPEES: ['\\', '\\\\', '\\"', '"',
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"\x00", "\x01", "\x02", "\x03", "\x04", "\x05", "\x06", "\x07",
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"\x08", "\x09", "\x0a", "\x0b", "\x0c", "\x0d", "\x0e", "\x0f",
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"\x10", "\x11", "\x12", "\x13", "\x14", "\x15", "\x16", "\x17",
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"\x18", "\x19", "\x1a", "\x1b", "\x1c", "\x1d", "\x1e", "\x1f",
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(ch = String.fromCharCode)(0x0085), ch(0x00A0), ch(0x2028), ch(0x2029)]
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@LIST_ESCAPED: ['\\\\', '\\"', '\\"', '\\"',
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"\\0", "\\x01", "\\x02", "\\x03", "\\x04", "\\x05", "\\x06", "\\a",
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"\\b", "\\t", "\\n", "\\v", "\\f", "\\r", "\\x0e", "\\x0f",
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"\\x10", "\\x11", "\\x12", "\\x13", "\\x14", "\\x15", "\\x16", "\\x17",
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"\\x18", "\\x19", "\\x1a", "\\e", "\\x1c", "\\x1d", "\\x1e", "\\x1f",
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"\\N", "\\_", "\\L", "\\P"]
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@MAPPING_ESCAPEES_TO_ESCAPED: do =>
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mapping = {}
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for i in [0...@LIST_ESCAPEES.length]
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mapping[@LIST_ESCAPEES[i]] = @LIST_ESCAPED[i]
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return mapping
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# Characters that would cause a dumped string to require double quoting.
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@PATTERN_CHARACTERS_TO_ESCAPE: new Pattern '[\\x00-\\x1f]|\xc2\x85|\xc2\xa0|\xe2\x80\xa8|\xe2\x80\xa9'
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# Other precompiled patterns
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@PATTERN_MAPPING_ESCAPEES: new Pattern @LIST_ESCAPEES.join('|').split('\\').join('\\\\')
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@PATTERN_SINGLE_QUOTING: new Pattern '[\\s\'":{}[\\],&*#?]|^[-?|<>=!%@`]'
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# Determines if a JavaScript value would require double quoting in YAML.
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#
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# @param [String] value A JavaScript value value
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#
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# @return [Boolean] true if the value would require double quotes.
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#
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@requiresDoubleQuoting: (value) ->
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return @PATTERN_CHARACTERS_TO_ESCAPE.test value
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# Escapes and surrounds a JavaScript value with double quotes.
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#
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# @param [String] value A JavaScript value
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#
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# @return [String] The quoted, escaped string
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#
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@escapeWithDoubleQuotes: (value) ->
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result = @PATTERN_MAPPING_ESCAPEES.replace value, (str) =>
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return @MAPPING_ESCAPEES_TO_ESCAPED[str]
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return '"'+result+'"'
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# Determines if a JavaScript value would require single quoting in YAML.
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#
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# @param [String] value A JavaScript value
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#
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# @return [Boolean] true if the value would require single quotes.
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#
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@requiresSingleQuoting: (value) ->
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return @PATTERN_SINGLE_QUOTING.test value
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# Escapes and surrounds a JavaScript value with single quotes.
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#
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# @param [String] value A JavaScript value
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#
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# @return [String] The quoted, escaped string
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#
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@escapeWithSingleQuotes: (value) ->
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return "'"+value.replace(/'/g, "''")+"'"
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module.exports = Escaper
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