Examples of com.google.caja.lang.css.CssPropertyPatterns$JSREBuilder

com.google.caja.lang.css.CssPropertyPatterns
of allowed literal tokens. var CSS_LIT_GROUP = [["auto",...],...]; var CSS_REGEX = [/^...$/]; var cssSchema = { "float": { // Describe the kinds of tokens that can appear in the named // property's value and any additional restrictions. cssPropBits: CSS_PROP_BIT_x | CSS_PROP_BIT_y | ..., // Aliases for the named property. cssAlternates: ["cssFloat", "styleFloat"], // Groups of literal values allowed. cssLitGroup: [CSS_LIT_GROUP[1],CSS_LIT_GROUP[3],CSS_LIT_GROUP[16]], // Matches any other tokens that can be part of the value including // function calls like rgba(...). cssExtra: CSS_REGEX[2] }, ... };
The {@code css} map does not contain every property in the given{@link CssSchema} since some cannot be matched efficiently by values.See comments on {@code [ a || b ]*} constructs inline below.
Program Flow

This class examines a schema and builds a list of all allowed CSS properties. It then tries to convert each property's signature to a regular expression pattern. It may fail for some patterns, especially the aggregate ones like {@code background} which combine{@code background-image}, {@code background-style}, etc.
Next it optimizes the patterns it found. This includes flattening concatenation and union operators, and moving the {@code \s+} out of unions.Optimizing {@code /((blue\s+|red\s+|green\s+)|inherit\s+)/} might yield thesimpler expression {@code /(blue|red|green|inherit)\s+/}.
Once it has a mapping of property names to regular expressions it builds a constant pool by hashing on regular expression text. This allows properties with identical patterns such as {@code border-top} and{@code border-bottom} to share an instance.
Finally it builds a javascript parse tree that assigns the {@code css}namespace to an object whose keys are CSS property names, and whose values are regular expressions.
Caveats

Some of the regular expressions do match URLs. If valid css text contains the string 'uri' case-insensitively, then a client may need to extract and rewrite URLs. Since all strings are double quoted, this should be doable without lexing CSS. @author mikesamuel@gmail.com

  CssPropertyPatterns pp;


  @Override
  public void setUp() throws Exception {
    super.setUp();
    pp = new CssPropertyPatterns(CssSchema.getDefaultCss21Schema(mq));
  }

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    assertDigest("[ foo | [ a || b || c || d ] | bar ]",
                 "{\n  'lits': [ 'a', 'b', 'bar', 'c', 'd', 'foo' ]\n}");
  }


  public final void testLiteralExtraction() {
    CssPropertyPatterns pp = new CssPropertyPatterns(
        CssSchema.getDefaultCss21Schema(mq));
    String text = "[ foo || bar() ]";
    CssPropertyData actual = pp.cssPropertyToData("test", parseSignature(text));
    assertEquals("test", actual.key);
    assertEquals(actual.fns.toString(), 1, actual.fns.size());
    assertEquals("bar", actual.fns.iterator().next().getName());


  }

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   */
  private void fixTerms(AncestorChain<? extends CssTree> t) {
    SymbolInfo stdColors = cssSchema.getSymbol(Name.css("color-standard"));
    final Pattern stdColorMatcher;
    if (stdColors != null) {
      stdColorMatcher = new CssPropertyPatterns(cssSchema)
          .cssPropertyToJavaRegex(stdColors.sig);
    } else {
      stdColorMatcher = null;
    }
    t.node.visitPreOrder(new ParseTreeNodeVisitor() {

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            + "}",
            getName()));
}


  private String toPattern(String sig) {
    CssPropertyPatterns pp = new CssPropertyPatterns(
        CssSchema.getDefaultCss21Schema(mq));
    return pp.cssPropertyToPattern(parseSignature(sig), true).regex;
  }

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   */
  private void fixTerms(AncestorChain<? extends CssTree> t) {
    SymbolInfo stdColors = schema.getSymbol(Name.css("color-standard"));
    final Pattern stdColorMatcher;
    if (stdColors != null) {
      stdColorMatcher = new CssPropertyPatterns(schema)
          .cssPropertyToJavaRegex(stdColors.sig);
    } else {
      stdColorMatcher = null;
    }
    t.node.visitPreOrder(new ParseTreeNodeVisitor() {

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Examples of com.google.caja.lang.css.CssPropertyPatterns$JSREBuilder

Program Flow

Caveats

Related Classes of com.google.caja.lang.css.CssPropertyPatterns$JSREBuilder