| /* |
| * Copyright (c) 2002-2020, the original author or authors. |
| * |
| * This software is distributable under the BSD license. See the terms of the |
| * BSD license in the documentation provided with this software. |
| * |
| * https://opensource.org/licenses/BSD-3-Clause |
| */ |
| package jdk.internal.org.jline.reader; |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public interface Parser { |
| static final String REGEX_VARIABLE = "[a-zA-Z_]{1,}[a-zA-Z0-9_-]*"; |
| static final String REGEX_COMMAND = "[:]{0,1}[a-zA-Z]{1,}[a-zA-Z0-9_-]*"; |
| |
| ParsedLine parse(String line, int cursor, ParseContext context) throws SyntaxError; |
| |
| default ParsedLine parse(String line, int cursor) throws SyntaxError { |
| return parse(line, cursor, ParseContext.UNSPECIFIED); |
| } |
| |
| default boolean isEscapeChar(char ch) { |
| return ch == '\\'; |
| } |
| |
| default boolean validCommandName(String name) { |
| return name != null && name.matches(REGEX_COMMAND); |
| } |
| |
| default boolean validVariableName(String name) { |
| return name != null && name.matches(REGEX_VARIABLE); |
| } |
| |
| default String getCommand(final String line) { |
| String out = ""; |
| Pattern patternCommand = Pattern.compile("^\\s*" + REGEX_VARIABLE + "=(" + REGEX_COMMAND + ")(\\s+.*|$)"); |
| Matcher matcher = patternCommand.matcher(line); |
| if (matcher.find()) { |
| out = matcher.group(1); |
| } else { |
| out = line.trim().split("\\s+")[0]; |
| int idx = out.indexOf("="); |
| if (idx > -1) { |
| out = out.substring(idx + 1); |
| } |
| if (!out.matches(REGEX_COMMAND)) { |
| out = ""; |
| } |
| } |
| return out; |
| } |
| |
| default String getVariable(final String line) { |
| String out = null; |
| Pattern patternCommand = Pattern.compile("^\\s*(" + REGEX_VARIABLE + ")\\s*=[^=~].*"); |
| Matcher matcher = patternCommand.matcher(line); |
| if (matcher.find()) { |
| out = matcher.group(1); |
| } |
| return out; |
| } |
| |
| enum ParseContext { |
| UNSPECIFIED, |
| |
| /** Try a real "final" parse. |
| * May throw EOFError in which case we have incomplete input. |
| */ |
| ACCEPT_LINE, |
| |
| /** Parsed words will have all characters present in input line |
| * including quotes and escape chars. |
| * May throw EOFError in which case we have incomplete input. |
| */ |
| SPLIT_LINE, |
| |
| /** Parse to find completions (typically after a Tab). |
| * We should tolerate and ignore errors. |
| */ |
| COMPLETE, |
| |
| /** Called when we need to update the secondary prompts. |
| * Specifically, when we need the 'missing' field from EOFError, |
| * which is used by a "%M" in a prompt pattern. |
| */ |
| SECONDARY_PROMPT |
| } |
| } |