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Is there a way to write a rule to identify sentence that have number separated by “,” or “-”

See original GitHub issue

Hello, I got a couple questions. I read all the doc on the web site and two blogs abut nearley.js and I’m still stuck with, that seem, a simple problem.

I have a rule targeting a sentence with number separated by “,” and a other rule that number are separated by “-”.

But the rule that target “,” take over on the rule that target “-”.

My grammar:


BUCKET -> [a-zA-Z0-9-]:+ {%     function(data) {
                                     return {
                                         value: data.join('').replace(/,/g,"")
                                 } %}

                                      return  {type: 'rangeSelection', body: data}
                                     } %}

                    return  {type: 'rangeSelection', body: [data[0],data[2]]}
                   } %}

The result I would like to have is, when a user enter “select 111-222” the return is a object saying that is a range selection and the 2 values (min, max). And when the sentence is “select a1,a2,a3,a4,a5” the return is a object saying that is a accumulation selection and all the value entered.

thanks in advance for the help

Issue Analytics

  • State:open
  • Created 4 years ago
  • Comments:10

github_iconTop GitHub Comments

Seallycommented, Apr 11, 2019
  • The data argument for the post-processors is an array. You want data[0], data[1], and so on, as appropriate. Note that since we’re using a lexer, each of them is a lexer object, so you want to call data[i].value (or data[i].text in some cases, the Moo docs explains the difference) to get the actual value.
  • You may want to “gather” each value in ACCUMULATION_SELECTION into an array and return it. Check how the JSON grammar example handles the arrays. The return value should be the gathered array with all the values you’ll need inside them.
  • Basically, the top level rule’s post-processor should return the object you want, with stuff like data[0] acting as placeholders for every non-terminal that you want to add into the object (keep in mind that within parentheses the object will actually be in something like data[2][0] and not data[2]). You may want to reorganize the rules to make it easier for you to do this.
Seallycommented, Apr 11, 2019

When you use a lexer, every string you use needs to be declared in the lexer. So if you have a grammar like:

helloString -> "Hello" __ "World"
__          -> %whitespaces

Then in the lexer, you must declare:

let lexer = moo.compile({
    whitespaces: { match: /\s+/, lineBreaks: true },
    'Hello': 'Hello',
    'World': 'World'

It tripped me up the first time too, but if you think about it, it kinda makes sense, since the lexer completely replaces Nearley’s tokenizer, so it has to know them too. This fact is also subtly demonstrated in the JSON grammar example (you’ll notice all the braces and brackets used are declared in the lexer), but can be easy to miss 😃.

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