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Re: Parsing quoted text
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Re: Parsing quoted text


  • Subject: Re: Parsing quoted text
  • From: T&B <email@hidden>
  • Date: Wed, 27 Sep 2006 13:22:49 +1000

Hi Yvan,

Important question.

Are the datas allowed to contain this kind of values:

item1  item2    'item [3]'  [item's 4]  "item's [5]"

I think to that because it may be the reason explaining the use of several delimiters.

That's correct. So if the quotePairList contains "" '' and [] then the output should be:

{"item1", "item2", "item [3]", "item's 4", "item's [5]"}

or, as per my original post:

item1 item2 'item 3' 'item 4' [item 5] "item[6]" 'item "7"'

parsed using a delimiter of:  a space
and a list of quote pairs: ""    ''    []

Would give:

{"item1", "item2", "item 3", "item 4", "item 5", "item[6]", "item \"7\""}

Or, for an everyday example:

osascript -e 'tell application "iChat" to set status message to "AppleScripting"'

parsed by space delimiter and quotes "" and '', would give:

--> {"osascript", "-e", "tell application \"iChat\" to set status message to \"AppleScripting\""}

and parsing the last item of that result would give:

--> {"tell", "application", "iChat", "to", "set", "status", "message", "to", "AppleScripting"}

or, if parsing a shell SQL statement:

sqlite3 test.db 'CREATE TABLE [Customer List]([First name] TEXT, [Last name] TEXT, id INTEGERPRIMARY KEY AUTOINCREMENT, status TEXT DEFAULT \"Current\")'

with delimiter = space, quotePairList = ""  ''

gives:

{"sqlite3", "test.db", "CREATE TABLE [Customer List]([First name] TEXT, [Last name] TEXT, id INTEGER AUTOINCREMENT PRIMARY KEY, status TEXT DEFAULT \"Current\")"}

And further on, using the field definitions to parse again:

set textBlock to "[First name] TEXT, [Last name] TEXT, id INTEGERPRIMARY KEY AUTOINCREMENT , status TEXT DEFAULT \"Current\""
set delimiter to ","
set quotePairList to {} -- ie none
set doTrimSpace to true -- ie remove white space (spaces and tabs) surrounding each parsed item

set columnDefList to ParseQuotedText of textBlock between delimiter out of quotePairList with doTrimSpace

--> {"[First name] TEXT", "[Last name] TEXT", "id INTEGER PRIMARY KEY AUTOINCREMENT", "status TEXT DEFAULT \"Current\""}

--Then parsing each of those items using:

set delimiter to " "
set quotePairList to {{quote, quote}, {"'", "'"}, {"[", "]"}}
set doTrimSpace to true

set tableDefList to {}
repeat with columnDef in columnDefList
 set end in tableDefList to ParseQuotedText of columnDef between delimiter out of quotePairList with doTrimSpace
end repeat
return tableDefList

--> {
{"First name", "TEXT"},
{"Last name", "TEXT"},
{"id", "INTEGER", "PRIMARY", "KEY", "AUTOINCREMENT"},
{"status", "TEXT", "DEFAULT", "Current"}
}

I hope this gives a thorough background. Thanks for your input. It seems like a common requirement, to parse with this level of flexibility. Has no-one else come across such a need? I'll post my own solution soon, if anyone else would like it.

Thanks,
Tom
T&B

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References: 
 >Parsing quoted text (From: T&B <email@hidden>)
 >Re: Parsing quoted text (From: Yvan KOENIG <email@hidden>)
 >Re: Parsing quoted text (From: T&B <email@hidden>)
 >Re: Parsing quoted text (From: Yvan KOENIG <email@hidden>)

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