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Support for string interpolation #20.
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Dec 12, 2012
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100 changes: 100 additions & 0 deletions
100
src/main/java/com/github/sommeri/less4j/core/compiler/expressions/StringInterpolator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package com.github.sommeri.less4j.core.compiler.expressions; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
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| import com.github.sommeri.less4j.core.ast.CssString; | ||
| import com.github.sommeri.less4j.core.ast.Expression; | ||
| import com.github.sommeri.less4j.core.ast.Variable; | ||
| import com.github.sommeri.less4j.core.parser.HiddenTokenAwareTree; | ||
| import com.github.sommeri.less4j.utils.InStringCssPrinter; | ||
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| public class StringInterpolator { | ||
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| private final static Pattern STR_INTERPOLATION = Pattern.compile("@\\{([^\\{\\}@])*\\}"); | ||
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| public String replaceInterpolatedVariables(String originalValue, ExpressionEvaluator expressionEvaluator, HiddenTokenAwareTree technicalUnderlying) { | ||
| StringBuilder result = new StringBuilder(); | ||
| List<MatchRange> matches = findMatches(originalValue); | ||
| int lastEnd = 0; | ||
| for (MatchRange matchRange : matches) { | ||
| // add everything from the last end to match from | ||
| result.append(originalValue.substring(lastEnd, matchRange.getFrom())); | ||
| // replace match by value | ||
| result.append(evaluate(expressionEvaluator, technicalUnderlying, matchRange)); | ||
| // update last end | ||
| lastEnd = matchRange.getTo(); | ||
| } | ||
| // add everything from the last end to end of string | ||
| if (lastEnd<originalValue.length()) | ||
| result.append(originalValue.substring(lastEnd)); | ||
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| return result.toString(); | ||
| } | ||
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| private String evaluate(ExpressionEvaluator expressionEvaluator, HiddenTokenAwareTree technicalUnderlying, MatchRange matchRange) { | ||
| Expression value = expressionEvaluator.evaluateIfPresent(new Variable(technicalUnderlying, matchRange.getVariableName())); | ||
| if (value!=null && (value instanceof CssString)) { | ||
| CssString string = (CssString) value; | ||
| return replaceInterpolatedVariables(string.getValue(), expressionEvaluator, technicalUnderlying); | ||
| } else if (value==null) { | ||
| return matchRange.getFullMatch(); | ||
| } else { | ||
| InStringCssPrinter builder = new InStringCssPrinter(); | ||
| builder.append(value); | ||
| String replacement = builder.toString(); | ||
| return replacement; | ||
| } | ||
| } | ||
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| private List<MatchRange> findMatches(String originalValue) { | ||
| List<MatchRange> result = new ArrayList<MatchRange>(); | ||
| Matcher matcher = STR_INTERPOLATION.matcher(originalValue); | ||
| while (matcher.find()) { | ||
| result.add(createMatchRange(matcher)); | ||
| } | ||
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| return result; | ||
| } | ||
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| private MatchRange createMatchRange(Matcher matcher) { | ||
| String group = matcher.group(); | ||
| return new MatchRange(matcher.start(), matcher.end(), "@"+group.substring(2, group.length()-1), group); | ||
| } | ||
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| } | ||
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| class MatchRange { | ||
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| private final int from; | ||
| private final int to; | ||
| private final String variableName; | ||
| private final String fullMatch; | ||
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| public MatchRange(int from, int to, String variableName, String fullMatch) { | ||
| super(); | ||
| this.from = from; | ||
| this.to = to; | ||
| this.variableName = variableName; | ||
| this.fullMatch = fullMatch; | ||
| } | ||
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| public int getFrom() { | ||
| return from; | ||
| } | ||
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| public int getTo() { | ||
| return to; | ||
| } | ||
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| public String getVariableName() { | ||
| return variableName; | ||
| } | ||
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| public String getFullMatch() { | ||
| return fullMatch; | ||
| } | ||
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| } |
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26 changes: 26 additions & 0 deletions
26
src/main/java/com/github/sommeri/less4j/utils/InStringCssPrinter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package com.github.sommeri.less4j.utils; | ||
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| import java.util.List; | ||
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| import com.github.sommeri.less4j.core.ast.ColorExpression; | ||
| import com.github.sommeri.less4j.core.ast.Comment; | ||
| import com.github.sommeri.less4j.core.ast.CssString; | ||
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| public class InStringCssPrinter extends CssPrinter { | ||
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| @Override | ||
| protected void appendComments(List<Comment> comments, boolean ensureSeparator) { | ||
| } | ||
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| @Override | ||
| public boolean appendCssString(CssString expression) { | ||
| builder.append(expression.getValue()); | ||
| return true; | ||
| } | ||
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| @Override | ||
| protected boolean appendColorExpression(ColorExpression expression) { | ||
| builder.append(expression.getValue()); | ||
| return true; | ||
| } | ||
| } |
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