125 lines
3.1 KiB
Java
125 lines
3.1 KiB
Java
package it.cavallium.warppi.math.rules.dsl.errorutils;
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import it.cavallium.warppi.math.rules.dsl.DslError;
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import it.cavallium.warppi.math.rules.dsl.UndefinedSubFunction;
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import it.cavallium.warppi.math.rules.dsl.frontend.*;
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import java.util.stream.Collectors;
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/**
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* Creates human-readable error messages from instances of {@link DslError}.
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*/
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public class DslErrorMessageFormatter implements DslError.Visitor<String> {
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/**
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* Formats the given <code>DslError</code> as a human-readable message, according to its type.
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*
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* @param error The error to format.
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* @return One or more lines of text which describe the error (without a trailing newline).
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*/
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public String format(final DslError error) {
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return error.accept(this);
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}
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@Override
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public String visit(final IncompleteNumberLiteral incompleteNumberLiteral) {
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return String.format(
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"Number has a decimal point but no digits following it: %s",
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incompleteNumberLiteral.getLiteral()
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);
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}
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@Override
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public String visit(final UndefinedSubFunction undefinedSubFunction) {
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return String.format(
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"Sub-function \"%s\" is used in a replacement pattern,\nbut not defined in the target pattern",
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undefinedSubFunction.getName()
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);
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}
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@Override
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public String visit(final UnexpectedCharacters unexpectedCharacters) {
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final String plural = unexpectedCharacters.getLength() > 1 ? "s" : "";
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return String.format("Unexpected character%s: %s", plural, unexpectedCharacters.getUnexpectedCharacters());
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}
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@Override
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public String visit(final UnexpectedToken unexpectedToken) {
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final String suggestions;
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if (unexpectedToken.getSuggested().isEmpty()) {
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suggestions = "";
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} else {
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suggestions = "\nSome suggestions are: " + unexpectedToken.getSuggested().stream()
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.map(DslErrorMessageFormatter::tokenTypeName)
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.collect(Collectors.joining(", "));
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}
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return String.format(
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"Unexpected %s%s",
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tokenTypeName(unexpectedToken.getUnexpected().type),
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suggestions
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);
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}
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@Override
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public String visit(final UnterminatedComment unterminatedComment) {
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return "Unterminated comment";
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}
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private static String tokenTypeName(final TokenType type) {
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switch (type) {
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case EOF:
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return "end of input";
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case COLON:
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return "\":\"";
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case ARROW:
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return "\"->\"";
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case COMMA:
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return "\",\"";
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case LEFT_PAREN:
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return "\"(\"";
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case RIGHT_PAREN:
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return "\")\"";
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case LEFT_BRACKET:
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return "\"[\"";
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case RIGHT_BRACKET:
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return "\"]\"";
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case EQUALS:
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return "\"=\"";
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case PLUS:
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return "\"+\"";
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case MINUS:
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return "\"-\"";
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case PLUS_MINUS:
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return "\"+-\"";
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case TIMES:
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return "\"*\"";
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case DIVIDE:
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return "\"/\"";
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case POWER:
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return "\"^\"";
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case REDUCTION:
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case EXPANSION:
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case CALCULATION:
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case EXISTENCE:
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case ARCCOS:
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case ARCSIN:
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case ARCTAN:
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case COS:
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case SIN:
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case TAN:
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case ROOT:
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case SQRT:
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case LOG:
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case UNDEFINED:
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case PI:
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case E:
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return '"' + type.name().toLowerCase() + '"';
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case NUMBER:
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return "number";
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case IDENTIFIER:
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return "identifier";
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}
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throw new RuntimeException("unknown token type");
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}
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}
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