Dart-based command-line analyzer.

pkg/analyzer_experimental/lib/error_formatter.dart

Index: pkg/analyzer_experimental/lib/error_formatter.dart
diff --git a/pkg/analyzer_experimental/lib/error_formatter.dart b/pkg/analyzer_experimental/lib/error_formatter.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9aafb9fb8a79cc69088d27667cfa38980d689f49
--- /dev/null
+++ b/pkg/analyzer_experimental/lib/error_formatter.dart
@@ -0,0 +1,143 @@
+part of analyzer;
+
+/**
+ * Helper for formatting [AnalysisError]s.
+ * The two format options are a user consumable format and a machine consumable format.
+ */
+class _ErrorFormatter {
+  StringSink out;
+  CommandLineOptions options;
+
+  _ErrorFormatter(this.out, this.options);
+
+  void startAnalysis() {
+    if (!options.machineFormat) {
+      out.writeln("Analyzing ${options.sourceFiles}...");
+    }
+  }
+
+  void formatErrors(List<AnalysisErrorInfo> errorInfos) {
+    var errors = new List<AnalysisError>();
+    var errorToLine = new Map<AnalysisError, LineInfo>();
+    for (AnalysisErrorInfo errorInfo in errorInfos) {
+      for (AnalysisError error in errorInfo.errors) {
+        errors.add(error);
+        errorToLine[error] = errorInfo.lineInfo;
+      }
+    }
+    // sort errors
+    errors.sort((AnalysisError error1, AnalysisError error2) {
+      // severity
+      int compare = error2.errorCode.errorSeverity.compareTo(error1.errorCode.errorSeverity);
+      if (compare != 0) {
+        return compare;
+      }
+      // path
+      compare = Comparable.compare(error1.source.fullName.toLowerCase(), error2.source.fullName.toLowerCase());
+      if (compare != 0) {
+        return compare;
+      }
+      // offset
+      return error1.offset - error2.offset;
+    });
+    // format errors
+    int errorCount = 0;
+    int warnCount = 0;
+    for (AnalysisError error in errors) {
+      if (error.errorCode.errorSeverity == ErrorSeverity.ERROR) {
+        errorCount++;
+      } else if (error.errorCode.errorSeverity == ErrorSeverity.WARNING) {
+        if (options.warningsAreFatal) {
+          errorCount++;
+        } else {
+          warnCount++;
+        }
+      }
+      formatError(errorToLine, error);
+    }
+    // print statistics
+    if (!options.machineFormat) {
+      if (errorCount != 0 && warnCount != 0) {
+        out.write(errorCount);
+        out.write(' ');
+        out.write(pluralize("error", errorCount));
+        out.write(' and ');
+        out.write(warnCount);
+        out.write(' ');
+        out.write(pluralize("warning", warnCount));
+        out.writeln(' found.');
+      } else if (errorCount != 0) {
+        out.write(errorCount);
+        out.write(' ');
+        out.write(pluralize("error", errorCount));
+        out.writeln(' found.');
+      } else if (warnCount != 0) {
+        out.write(warnCount);
+        out.write(' ');
+        out.write(pluralize("warning", warnCount));
+        out.writeln(' found.');
+      } else {
+        out.writeln("No issues found.");
+      }
+    }
+  }
+
+  void formatError(Map<AnalysisError, LineInfo> errorToLine, AnalysisError error) {
+    Source source = error.source;
+    LineInfo_Location location = errorToLine[error].getLocation(error.offset);
+    int length = error.length;
+    var severity = error.errorCode.errorSeverity;
+    if (options.machineFormat) {
+      if (severity == ErrorSeverity.WARNING && options.warningsAreFatal) {
+        severity = ErrorSeverity.ERROR;
+      }
+      out.write(severity);
+      out.write('|');
+      out.write(error.errorCode.type);
+      out.write('|');
+      out.write(error.errorCode);
+      out.write('|');
+      out.write(escapePipe(source.fullName));
+      out.write('|');
+      out.write(location.lineNumber);
+      out.write('|');
+      out.write(location.columnNumber);
+      out.write('|');
+      out.write(length);
+      out.write('|');
+      out.writeln(escapePipe(error.message));
+    } else {
+      // [warning] 'foo' is not a method or function (/Users/devoncarew/temp/foo.dart:-1:-1)
+      out.write('[');
+      out.write(severity.displayName);
+      out.write('] ');
+      out.write(error.message);
+      out.write(' (');
+      out.write(source.fullName);
+      out.write(':');
+      out.write(location.lineNumber);
+      out.write(':');
+      out.write(location.columnNumber);
+      out.writeln(')');
+    }
+  }
+
+  static String escapePipe(String input) {
+    var result = new StringBuffer();
+    for (var c in input.codeUnits) {
+      if (c == '\\' || c == '|') {
+        result.write('\\');
+      }
+      result.writeCharCode(c);
+    }
+    return result.toString();
+  }
+
+  static String pluralize(String word, int count) {
+    if (count == 1) {
+      return word;
+    } else {
+      return word + "s";
+    }
+  }
+}