Add double-paren expression

* Use the external scanner for regexes
* Add some missing operators

Fixes #22
Fixes #32

corpus/literals.txt

@@ -90,7 +90,7 @@ F="${G%% *}"
     (string (expansion (subscript (variable_name) (word)))))
   (variable_assignment
     (variable_name)
-    (string (expansion (variable_name) (regex) (word) (word))))
+    (string (expansion (variable_name) (regex))))
   (variable_assignment
     (variable_name)
     (string (expansion (variable_name) (word) (word)))))

grammar.js

@@ -34,6 +34,7 @@ module.exports = grammar({
     $._empty_value,
     $._concat,
     $.variable_name, // Variable name followed by an operator like '=' or '+='
+    $.regex,
     '}',
     ']',
     '\n',
@@ -229,7 +230,8 @@ module.exports = grammar({
     test_command: $ => seq(
       choice(
         seq('[', $._expression, ']'),
-        seq('[[', $._expression, ']]')
+        seq('[[', $._expression, ']]'),
+        seq('((', $._expression, '))')
       ),
       repeat(choice(
         $.file_redirect,
@@ -265,7 +267,7 @@ module.exports = grammar({
         $._literal,
         seq(
           choice('=~', '=='),
-          choice($.regex, $._literal)
+          choice($._literal, $.regex)
         )
       )),
       repeat(choice(
@@ -338,13 +340,20 @@ module.exports = grammar({
       $._literal,
       $.unary_expression,
       $.binary_expression,
+      $.postfix_expression,
       $.parenthesized_expression
     ),
 
     binary_expression: $ => prec.left(choice(
       seq(
         $._expression,
-        choice('==', '=', '=~', '!=', '<', '>', '||', '&&', $.test_operator),
+        choice(
+          '=', '==', '=~', '!=',
+          '+', '-', '+=', '-=',
+          '<', '>', '<=', '>=',
+          '||', '&&',
+          $.test_operator
+        ),
         $._expression
       ),
       seq(
@@ -359,6 +368,11 @@ module.exports = grammar({
       $._expression
     )),
 
+    postfix_expression: $ => seq(
+      $._expression,
+      choice('++', '--'),
+    ),
+
     parenthesized_expression: $ => seq(
       '(',
       $._expression,
@@ -453,7 +467,7 @@ module.exports = grammar({
           ),
           optional(seq(
             token(prec(1, '/')),
-            alias($.regex_without_right_brace, $.regex)
+            optional($.regex)
           )),
           repeat(choice(
             $._literal,
@@ -488,10 +502,6 @@ module.exports = grammar({
 
     test_operator: $ => token(prec(1, seq('-', /[a-zA-Z]+/))),
 
-    regex: $ => /([^"\s]|\\.)([^\s]|\\.)*/,
-
-    regex_without_right_brace: $ => /([^"\s}]|\\.)([^\s}]|\\.)*/,
-
     _terminator: $ => choice(';', ';;', '\n', '&')
   }
 });

script/known-failures.txt

@@ -4,7 +4,6 @@ examples/bash-it/plugins/available/go.plugin.bash
 examples/bash-it/install.sh
 examples/bash-it/completion/available/svn.completion.bash
 examples/bash-it/completion/available/docker-compose.completion.bash
-examples/bash-it/completion/available/jboss7.completion.bash
 examples/bash-it/completion/available/gh.completion.bash
 examples/bash-it/completion/available/drush.completion.bash
 examples/bash-it/completion/available/hub.completion.bash
@@ -12,7 +11,6 @@ examples/bash-it/completion/available/docker-machine.completion.bash
 examples/bash-it/completion/available/git.completion.bash
 examples/bash-it/completion/available/defaults.completion.bash
 examples/bash-it/completion/available/packer.completion.bash
-examples/bash-it/completion/available/vault.completion.bash
 examples/bash-it/completion/available/docker.completion.bash
 examples/bash-it/completion/available/tmux.completion.bash
 examples/bash-it/lib/preexec.bash

src/grammar.json

@@ -858,6 +858,23 @@
                   "value": "]]"
                 }
               ]
+            },
+            {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "STRING",
+                  "value": "(("
+                },
+                {
+                  "type": "SYMBOL",
+                  "name": "_expression"
+                },
+                {
+                  "type": "STRING",
+                  "value": "))"
+                }
+              ]
             }
           ]
         },
@@ -1031,11 +1048,11 @@
                       "members": [
                         {
                           "type": "SYMBOL",
-                          "name": "regex"
+                          "name": "_literal"
                         },
                         {
                           "type": "SYMBOL",
-                          "name": "_literal"
+                          "name": "regex"
                         }
                       ]
                     }
@@ -1326,6 +1343,10 @@
           "type": "SYMBOL",
           "name": "binary_expression"
         },
+        {
+          "type": "SYMBOL",
+          "name": "postfix_expression"
+        },
         {
           "type": "SYMBOL",
           "name": "parenthesized_expression"
@@ -1350,11 +1371,11 @@
                 "members": [
                   {
                     "type": "STRING",
-                    "value": "=="
+                    "value": "="
                   },
                   {
                     "type": "STRING",
-                    "value": "="
+                    "value": "=="
                   },
                   {
                     "type": "STRING",
@@ -1364,6 +1385,22 @@
                     "type": "STRING",
                     "value": "!="
                   },
+                  {
+                    "type": "STRING",
+                    "value": "+"
+                  },
+                  {
+                    "type": "STRING",
+                    "value": "-"
+                  },
+                  {
+                    "type": "STRING",
+                    "value": "+="
+                  },
+                  {
+                    "type": "STRING",
+                    "value": "-="
+                  },
                   {
                     "type": "STRING",
                     "value": "<"
@@ -1372,6 +1409,14 @@
                     "type": "STRING",
                     "value": ">"
                   },
+                  {
+                    "type": "STRING",
+                    "value": "<="
+                  },
+                  {
+                    "type": "STRING",
+                    "value": ">="
+                  },
                   {
                     "type": "STRING",
                     "value": "||"
@@ -1447,6 +1492,28 @@
         ]
       }
     },
+    "postfix_expression": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "SYMBOL",
+          "name": "_expression"
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "++"
+            },
+            {
+              "type": "STRING",
+              "value": "--"
+            }
+          ]
+        }
+      ]
+    },
     "parenthesized_expression": {
       "type": "SEQ",
       "members": [
@@ -1874,13 +1941,16 @@
                           }
                         },
                         {
-                          "type": "ALIAS",
+                          "type": "CHOICE",
-                          "content": {
+                          "members": [
+                            {
                               "type": "SYMBOL",
-                            "name": "regex_without_right_brace"
+                              "name": "regex"
                             },
-                          "named": true,
+                            {
-                          "value": "regex"
+                              "type": "BLANK"
+                            }
+                          ]
                         }
                       ]
                     },
@@ -2114,14 +2184,6 @@
         }
       }
     },
-    "regex": {
-      "type": "PATTERN",
-      "value": "([^\"\\s]|\\\\.)([^\\s]|\\\\.)*"
-    },
-    "regex_without_right_brace": {
-      "type": "PATTERN",
-      "value": "([^\"\\s}]|\\\\.)([^\\s}]|\\\\.)*"
-    },
     "_terminator": {
       "type": "CHOICE",
       "members": [
@@ -2192,6 +2254,10 @@
       "type": "SYMBOL",
       "name": "variable_name"
     },
+    {
+      "type": "SYMBOL",
+      "name": "regex"
+    },
     {
       "type": "STRING",
       "value": "}"

src/scanner.cc

@@ -16,6 +16,7 @@ enum TokenType {
   EMPTY_VALUE,
   CONCAT,
   VARIABLE_NAME,
+  REGEX,
   CLOSING_BRACE,
   CLOSING_BRACKET,
   NEWLINE,
@@ -202,6 +203,63 @@ struct Scanner {
       return false;
     }
 
+    if (valid_symbols[REGEX]) {
+      while (iswspace(lexer->lookahead)) skip(lexer);
+
+      if (
+        lexer->lookahead != '"' &&
+        lexer->lookahead != '\'' &&
+        lexer->lookahead != '$'
+      ) {
+        struct State {
+          bool done;
+          uint32_t paren_depth;
+          uint32_t bracket_depth;
+          uint32_t brace_depth;
+        };
+
+        lexer->mark_end(lexer);
+
+        State state = {false, 0, 0, 0};
+        while (!state.done) {
+          switch (lexer->lookahead) {
+            case '\0':
+              return false;
+            case '(':
+              state.paren_depth++;
+              break;
+            case '[':
+              state.bracket_depth++;
+              break;
+            case '{':
+              state.bracket_depth++;
+              break;
+            case ')':
+              if (state.paren_depth == 0) state.done = true;
+              state.paren_depth--;
+              break;
+            case ']':
+              if (state.bracket_depth == 0) state.done = true;
+              state.bracket_depth--;
+              break;
+            case '}':
+              if (state.brace_depth == 0) state.done = true;
+              state.brace_depth--;
+              break;
+          }
+
+          if (!state.done) {
+            bool was_space = iswspace(lexer->lookahead);
+            advance(lexer);
+            if (!was_space) lexer->mark_end(lexer);
+          }
+        }
+
+        lexer->result_symbol = REGEX;
+        return true;
+      }
+    }
+
     return false;
   }