convert-helpers.js

'use strict';

var STYLE_ATTRIBUTE = 'TEXT-STYLE-NAME';

var styleMatches = function (item, styleName) {
  if (!item || item.attributes === undefined || item.attributes[STYLE_ATTRIBUTE] === undefined) {
    return false;
  }

  return item.attributes[STYLE_ATTRIBUTE].match(styleName);
};

module.exports = {
  replaceStyle: function (oldStyleName, newStyleName){
    return function(item){

      if (styleMatches(item, oldStyleName)) {
        item.attributes[STYLE_ATTRIBUTE] = newStyleName;
      }

      return item;
    }
  }
};

convert.js

#!/usr/bin/env node

var sax = require('sax').createStream();
var fileStream = require('fs').createReadStream('data.xml');

var helpers = require('./convert-helpers.js');
var replaceStyle = helpers.replaceStyle;

sax.on('opentag', replaceStyle('Text_20_body', 'BodyText'));
sax.on('opentag', replaceStyle(/Heading_\d+_1/, 'HeadingLevel1'));
sax.on('opentag', replaceStyle(/P\d+/, 'ListItem'));

fileStream.pipe(sax).pipe(process.stdout);

data.xml

<root>
  <section>
    <text:h text-style-name="Heading_20_1">Title 1</title>
    
    <text:p text-style-name="Text_20_body">Some text</text:p>
    <text:list text-style-name="L20">
      <text:list-item>
        <text:p text-style-name="P12">Bullet point 1</text:p>
      </text:list-item>
      <text:list-item>
        <text:p text-style-name="P12">Bullet point 2</text:p>
      </text:list-item>
    </text:list>
  </section>
</root>

package.json

{
  "name": "node-streams",
  "version": "0.0.0",
  "description": "",
  "main": "convert.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "https://gist.github.com/10409366.git"
  },
  "author": "",
  "license": "MIT",
  "bugs": {
    "url": "https://gist.github.com/10409366"
  },
  "homepage": "https://gist.github.com/10409366",
  "dependencies": {
    "sax": "^0.6.0"
  }
}