文字列リテラルでエスケープできるようにする #1
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tuchida
commented
Jun 17, 2021
| string = '"' (any - '"')* '"' | "'" (any - "'")* "'" ; # TODO escapes | ||
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| dqchar = [^"\\] | ( '\\' any ); | ||
| string = '"' . dqchar* . '"' | "'" (any - "'")* "'" ; |
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| if lex.data[lex.ts] == '\'' { | ||
| s = string(lex.data[lex.ts+1:lex.te-1]) | ||
| } else { | ||
| unquotedStr, err := strconv.Unquote(string(lex.data[lex.ts:lex.te])) |
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https://golang.org/pkg/strconv/#Unquote
strconv.Unquoteはシングルクォートを（文字列ではなく）文字として認識するため、2文字以上あるとエラーになる
ちなみにstrconv.Unquoteは``も有効な文字列として認識するのだけど、字句解析では許容していないので、ここにこないはず
anoChick
approved these changes
Jun 17, 2021
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ref. https://github.com/smartoperation/saasx/issues/3675, osteele#45
まずLiquidはShopifyのものが本家みたいなんだけど、その仕様では文字列リテラルのエスケープをしないと書いてある
https://shopify.github.io/liquid/basics/types/#string
このproposalでは``内ではエスケープできるようにするという仕様が提案されている
Shopify/liquid#1174 (comment)
本PRでは、クライアント側の都合によりJSONと互換性があると楽なのと、
strconv.Unquoteがよさそうだったので、""のみエスケープする、という実装にした