Add more selectors and property values

binding.gyp

@@ -8,6 +8,7 @@
       ],
       "sources": [
         "src/parser.c",
+        "src/scanner.c",
         "src/binding.cc"
       ],
       "cflags_c": [

corpus/declarations.txt

@@ -5,3 +5,17 @@ Functions
 a {
   color: rgba(0, 255, 0, 0.5);
 }
+
+---
+
+(stylesheet
+  (rule_set
+    (selectors (tag_name))
+    (block
+      (declaration
+        (property_name)
+        (function_value (function_name) (arguments
+          (integer_value)
+          (integer_value)
+          (integer_value)
+          (float_value)))))))

corpus/selectors.txt

@@ -18,31 +18,39 @@ div, span {}
 ---
 
 (stylesheet
-  (rule_set (selectors (type_selector (identifier)) (type_selector (identifier))) (block)))
+  (rule_set (selectors (tag_name) (tag_name)) (block)))
 
 =========================
 Class selectors
 =========================
 
 .class-a {}
-.class-b, .class-c {}
+div.class-b, .class-c.class-d {}
 
 ---
 
 (stylesheet
-  (rule_set (selectors (class_selector (identifier))) (block))
+  (rule_set
-  (rule_set (selectors (class_selector (identifier)) (class_selector (identifier))) (block)))
+    (selectors (class_selector (class_name)))
+    (block))
+  (rule_set
+    (selectors
+      (class_selector (tag_name) (class_name))
+      (class_selector (class_selector (class_name)) (class_name)))
+    (block)))
 
 =========================
 Id selectors
 =========================
 
-#some-id {}
+#some-id, a#another-id {}
 
 ---
 
 (stylesheet
-  (rule_set (selectors (id_selector (identifier))) (block)))
+  (rule_set
+    (selectors (id_selector (id_name)) (id_selector (tag_name) (id_name)))
+    (block)))
 
 =========================
 Attribute selectors
@@ -51,13 +59,45 @@ Attribute selectors
 [a] {}
 [b=c] {}
 [d~=e] {}
+a[b] {}
 
 ---
 
 (stylesheet
-  (rule_set (selectors (attribute_selector (property_name (identifier)))) (block))
+  (rule_set (selectors (attribute_selector (attribute_name))) (block))
-  (rule_set (selectors (attribute_selector (property_name (identifier)) (property_value))) (block))
+  (rule_set (selectors (attribute_selector (attribute_name) (value_name))) (block))
-  (rule_set (selectors (attribute_selector (property_name (identifier)) (property_value))) (block)))
+  (rule_set (selectors (attribute_selector (attribute_name) (value_name))) (block))
+  (rule_set (selectors (attribute_selector (tag_name) (attribute_name))) (block)))
+
+=========================
+Pseudo-class selectors
+=========================
+
+a:hover {}
+:nth-child(2) {}
+
+---
+
+(stylesheet
+  (rule_set
+    (selectors (pseudo_class_selector (tag_name) (class_name)))
+    (block))
+  (rule_set
+    (selectors (pseudo_class_selector (class_name) (arguments (integer_value))))
+    (block)))
+
+=========================
+Pseudo-element selectors
+=========================
+
+a::first-line {}
+
+---
+
+(stylesheet
+  (rule_set
+    (selectors (pseudo_element_selector (tag_name) (tag_name)))
+    (block)))
 
 =========================
 Child selectors
@@ -70,12 +110,12 @@ c > d > e {}
 
 (stylesheet
   (rule_set
-    (selectors (child_selector (type_selector (identifier)) (type_selector (identifier))))
+    (selectors (child_selector (tag_name) (tag_name)))
     (block))
   (rule_set
     (selectors (child_selector
-      (child_selector (type_selector (identifier)) (type_selector (identifier)))
+      (child_selector (tag_name) (tag_name))
-      (type_selector (identifier))))
+      (tag_name)))
     (block)))
 
 =========================
@@ -89,10 +129,30 @@ c d e {}
 
 (stylesheet
   (rule_set
-    (selectors (descendant_selector (type_selector (identifier)) (type_selector (identifier))))
+    (selectors (descendant_selector (tag_name) (tag_name)))
     (block))
   (rule_set
     (selectors (descendant_selector
-      (descendant_selector (type_selector (identifier)) (type_selector (identifier)))
+      (descendant_selector (tag_name) (tag_name))
-      (type_selector (identifier))))
+      (tag_name)))
     (block)))
+
+===========================
+Nesting selectors
+===========================
+
+a {
+  &.b {}
+  & c {}
+  & > d {}
+}
+
+---
+
+(stylesheet
+  (rule_set
+    (selectors (tag_name))
+    (block
+      (rule_set (selectors (class_selector (nesting_selector) (class_name))) (block))
+      (rule_set (selectors (descendant_selector (nesting_selector) (tag_name))) (block))
+      (rule_set (selectors (child_selector (nesting_selector) (tag_name))) (block)))))

corpus/stylesheets.txt

@@ -10,6 +10,6 @@ Rule sets
 
 (stylesheet
   (rule_set
-    (selectors (id_selector (identifier)))
+    (selectors (id_selector (id_name)))
     (block
-      (declaration (property_name (identifier)) (property_value)))))
+      (declaration (property_name) (integer_value (unit))))))

grammar.js

@@ -6,6 +6,10 @@ module.exports = grammar({
     $.comment,
   ],
 
+  externals: $ => [
+    $._descendant_operator,
+  ],
+
   rules: {
     stylesheet: $ => repeat(choice(
       $.rule_set,
@@ -27,60 +31,130 @@ module.exports = grammar({
 
     selectors: $ => commaSep1($._selector),
 
-    block: $ => seq('{', repeat($.declaration), '}'),
+    block: $ => seq(
+      '{',
+      repeat(choice($.declaration, $.rule_set)),
+      '}'
+    ),
 
     // Selectors
 
     _selector: $ => choice(
       $.universal_selector,
-      $.type_selector,
+      alias($.identifier, $.tag_name),
       $.class_selector,
+      $.nesting_selector,
+      $.pseudo_class_selector,
+      $.pseudo_element_selector,
       $.id_selector,
       $.attribute_selector,
       $.child_selector,
       $.descendant_selector
     ),
 
+    nesting_selector: $ => '&',
+
     universal_selector: $ => '*',
 
-    type_selector: $ => $.identifier,
+    class_selector: $ => seq(
+      optional($._selector),
+      '.',
+      alias($.identifier, $.class_name),
+    ),
 
-    class_selector: $ => seq('.', $.identifier),
+    pseudo_class_selector: $ => seq(
+      optional($._selector),
+      ':',
+      alias($.identifier, $.class_name),
+      optional($.arguments)
+    ),
 
-    id_selector: $ => seq('#', $.identifier),
+    pseudo_element_selector: $ => seq(
+      optional($._selector),
+      '::',
+      alias($.identifier, $.tag_name)
+    ),
+
+    id_selector: $ => seq(
+      optional($._selector),
+      '#',
+      alias($.identifier, $.id_name)
+    ),
 
     attribute_selector: $ => seq(
-      choice(
+      optional($._selector),
-        '[',
+      '[',
-        seq($._selector, token.immediate('['))
+      alias($.identifier, $.attribute_name),
-      ),
-      $.property_name,
       optional(seq(
         choice('=', '~=', '^=', '|=', '*=', '$='),
-        $.property_value
+        $._value
       )),
       ']'
     ),
 
     child_selector: $ => prec.left(seq($._selector, '>', $._selector)),
 
-    descendant_selector: $ => prec.left(seq($._selector, $._selector)),
+    descendant_selector: $ => prec.left(seq($._selector, $._descendant_operator, $._selector)),
 
     // Declarations
 
-    declaration: $ => seq(
+    declaration: $ => prec(1, seq(
-      $.property_name,
+      alias($.identifier, $.property_name),
       ':',
-      $.property_value,
+      repeat1($._value),
       ';'
+    )),
+
+    // Property Values
+
+    _value: $ => choice(
+      alias($.identifier, $.value_name),
+      $.color_value,
+      $.integer_value,
+      $.float_value,
+      $.function_value
+    ),
+
+    integer_value: $ => seq(
+      token(seq(
+        optional(choice('+', '-')),
+        /\d+/
+      )),
+      optional($.unit)
+    ),
+
+    float_value: $ => seq(
+      token(seq(
+        optional(choice('+', '-')),
+        /\d*/,
+        choice(
+          seq('.', /\d+/),
+          seq('e', optional('-'), /\d+/),
+          seq('.', /\d+/, 'e', optional('-'), /\d+/)
+        )
+      )),
+      optional($.unit)
+    ),
+
+    unit: $ => token.immediate(/[a-z]+/),
+
+    color_value: $ => /#[0-9a-fA-F]{3,6}/,
+
+    function_value: $ => seq(
+      alias($.identifier, $.function_name),
+      $.arguments
+    ),
+
+    arguments: $ => seq(
+      '(',
+      commaSep($._value),
+      ')'
     ),
 
     property_name: $ => $.identifier,
 
     identifier: $ => /[a-zA-Z-_]+/,
 
-    property_value: $ => /[^;()\[\]]+/,
-
     comment: $ => token(choice(
       seq('//', /.*/),
       seq(
@@ -92,6 +166,10 @@ module.exports = grammar({
   }
 })
 
+function commaSep (rule) {
+  return optional(commaSep1(rule))
+}
+
 function commaSep1 (rule) {
   return seq(rule, repeat(seq(',', rule)))
 }

src/grammar.json

@@ -74,8 +74,17 @@
         {
           "type": "REPEAT",
           "content": {
-            "type": "SYMBOL",
+            "type": "CHOICE",
-            "name": "declaration"
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "declaration"
+              },
+              {
+                "type": "SYMBOL",
+                "name": "rule_set"
+              }
+            ]
           }
         },
         {
@@ -92,13 +101,30 @@
           "name": "universal_selector"
         },
         {
-          "type": "SYMBOL",
+          "type": "ALIAS",
-          "name": "type_selector"
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "tag_name"
         },
         {
           "type": "SYMBOL",
           "name": "class_selector"
         },
+        {
+          "type": "SYMBOL",
+          "name": "nesting_selector"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "pseudo_class_selector"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "pseudo_element_selector"
+        },
         {
           "type": "SYMBOL",
           "name": "id_selector"
@@ -117,37 +143,143 @@
         }
       ]
     },
+    "nesting_selector": {
+      "type": "STRING",
+      "value": "&"
+    },
     "universal_selector": {
       "type": "STRING",
       "value": "*"
     },
-    "type_selector": {
-      "type": "SYMBOL",
-      "name": "identifier"
-    },
     "class_selector": {
       "type": "SEQ",
       "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "_selector"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "STRING",
           "value": "."
         },
         {
-          "type": "SYMBOL",
+          "type": "ALIAS",
-          "name": "identifier"
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "class_name"
+        }
+      ]
+    },
+    "pseudo_class_selector": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "_selector"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": ":"
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "class_name"
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "arguments"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        }
+      ]
+    },
+    "pseudo_element_selector": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "_selector"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": "::"
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "tag_name"
         }
       ]
     },
     "id_selector": {
       "type": "SEQ",
       "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "_selector"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "STRING",
           "value": "#"
         },
         {
-          "type": "SYMBOL",
+          "type": "ALIAS",
-          "name": "identifier"
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "id_name"
         }
       ]
     },
@@ -158,30 +290,26 @@
           "type": "CHOICE",
           "members": [
             {
-              "type": "STRING",
+              "type": "SYMBOL",
-              "value": "["
+              "name": "_selector"
             },
             {
-              "type": "SEQ",
+              "type": "BLANK"
-              "members": [
-                {
-                  "type": "SYMBOL",
-                  "name": "_selector"
-                },
-                {
-                  "type": "IMMEDIATE_TOKEN",
-                  "content": {
-                    "type": "STRING",
-                    "value": "["
-                  }
-                }
-              ]
             }
           ]
         },
         {
-          "type": "SYMBOL",
+          "type": "STRING",
-          "name": "property_name"
+          "value": "["
+        },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "attribute_name"
         },
         {
           "type": "CHOICE",
@@ -220,7 +348,7 @@
                 },
                 {
                   "type": "SYMBOL",
-                  "name": "property_value"
+                  "name": "_value"
                 }
               ]
             },
@@ -266,6 +394,10 @@
             "type": "SYMBOL",
             "name": "_selector"
           },
+          {
+            "type": "SYMBOL",
+            "name": "_descendant_operator"
+          },
           {
             "type": "SYMBOL",
             "name": "_selector"
@@ -274,23 +406,316 @@
       }
     },
     "declaration": {
+      "type": "PREC",
+      "value": 1,
+      "content": {
+        "type": "SEQ",
+        "members": [
+          {
+            "type": "ALIAS",
+            "content": {
+              "type": "SYMBOL",
+              "name": "identifier"
+            },
+            "named": true,
+            "value": "property_name"
+          },
+          {
+            "type": "STRING",
+            "value": ":"
+          },
+          {
+            "type": "REPEAT1",
+            "content": {
+              "type": "SYMBOL",
+              "name": "_value"
+            }
+          },
+          {
+            "type": "STRING",
+            "value": ";"
+          }
+        ]
+      }
+    },
+    "_value": {
+      "type": "CHOICE",
+      "members": [
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "value_name"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "color_value"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "integer_value"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "float_value"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "function_value"
+        }
+      ]
+    },
+    "integer_value": {
       "type": "SEQ",
       "members": [
         {
-          "type": "SYMBOL",
+          "type": "TOKEN",
-          "name": "property_name"
+          "content": {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "CHOICE",
+                "members": [
+                  {
+                    "type": "CHOICE",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": "+"
+                      },
+                      {
+                        "type": "STRING",
+                        "value": "-"
+                      }
+                    ]
+                  },
+                  {
+                    "type": "BLANK"
+                  }
+                ]
+              },
+              {
+                "type": "PATTERN",
+                "value": "\\d+"
+              }
+            ]
+          }
         },
         {
-          "type": "STRING",
+          "type": "CHOICE",
-          "value": ":"
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "unit"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        }
+      ]
+    },
+    "float_value": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "TOKEN",
+          "content": {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "CHOICE",
+                "members": [
+                  {
+                    "type": "CHOICE",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": "+"
+                      },
+                      {
+                        "type": "STRING",
+                        "value": "-"
+                      }
+                    ]
+                  },
+                  {
+                    "type": "BLANK"
+                  }
+                ]
+              },
+              {
+                "type": "PATTERN",
+                "value": "\\d*"
+              },
+              {
+                "type": "CHOICE",
+                "members": [
+                  {
+                    "type": "SEQ",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": "."
+                      },
+                      {
+                        "type": "PATTERN",
+                        "value": "\\d+"
+                      }
+                    ]
+                  },
+                  {
+                    "type": "SEQ",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": "e"
+                      },
+                      {
+                        "type": "CHOICE",
+                        "members": [
+                          {
+                            "type": "STRING",
+                            "value": "-"
+                          },
+                          {
+                            "type": "BLANK"
+                          }
+                        ]
+                      },
+                      {
+                        "type": "PATTERN",
+                        "value": "\\d+"
+                      }
+                    ]
+                  },
+                  {
+                    "type": "SEQ",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": "."
+                      },
+                      {
+                        "type": "PATTERN",
+                        "value": "\\d+"
+                      },
+                      {
+                        "type": "STRING",
+                        "value": "e"
+                      },
+                      {
+                        "type": "CHOICE",
+                        "members": [
+                          {
+                            "type": "STRING",
+                            "value": "-"
+                          },
+                          {
+                            "type": "BLANK"
+                          }
+                        ]
+                      },
+                      {
+                        "type": "PATTERN",
+                        "value": "\\d+"
+                      }
+                    ]
+                  }
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "unit"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        }
+      ]
+    },
+    "unit": {
+      "type": "IMMEDIATE_TOKEN",
+      "content": {
+        "type": "PATTERN",
+        "value": "[a-z]+"
+      }
+    },
+    "color_value": {
+      "type": "PATTERN",
+      "value": "#[0-9a-fA-F]{3,6}"
+    },
+    "function_value": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          },
+          "named": true,
+          "value": "function_name"
         },
         {
           "type": "SYMBOL",
-          "name": "property_value"
+          "name": "arguments"
+        }
+      ]
+    },
+    "arguments": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "("
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "SYMBOL",
+                  "name": "_value"
+                },
+                {
+                  "type": "REPEAT",
+                  "content": {
+                    "type": "SEQ",
+                    "members": [
+                      {
+                        "type": "STRING",
+                        "value": ","
+                      },
+                      {
+                        "type": "SYMBOL",
+                        "name": "_value"
+                      }
+                    ]
+                  }
+                }
+              ]
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
         },
         {
           "type": "STRING",
-          "value": ";"
+          "value": ")"
         }
       ]
     },
@@ -302,10 +727,6 @@
       "type": "PATTERN",
       "value": "[a-zA-Z-_]+"
     },
-    "property_value": {
-      "type": "PATTERN",
-      "value": "[^;()\\[\\]]+"
-    },
     "comment": {
       "type": "TOKEN",
       "content": {
@@ -356,6 +777,11 @@
     }
   ],
   "conflicts": [],
-  "externals": [],
+  "externals": [
+    {
+      "type": "SYMBOL",
+      "name": "_descendant_operator"
+    }
+  ],
   "inline": []
 }

src/scanner.c

@@ -0,0 +1,36 @@
+#include <tree_sitter/parser.h>
+#include <wctype.h>
+
+enum TokenType {
+  DESCENDANT_OP,
+};
+
+void *tree_sitter_css_external_scanner_create() { return NULL; }
+void tree_sitter_css_external_scanner_destroy(void *p) {}
+void tree_sitter_css_external_scanner_reset(void *p) {}
+unsigned tree_sitter_css_external_scanner_serialize(void *p, char *buffer) { return 0; }
+void tree_sitter_css_external_scanner_deserialize(void *p, const char *b, unsigned n) {}
+
+bool tree_sitter_css_external_scanner_scan(void *payload, TSLexer *lexer, const bool *valid_symbols) {
+  if (iswspace(lexer->lookahead)) {
+    lexer->advance(lexer, true);
+
+    while (iswspace(lexer->lookahead)) {
+      lexer->advance(lexer, true);
+    }
+
+    if (
+      lexer->lookahead == '#' ||
+      lexer->lookahead == '.' ||
+      lexer->lookahead == '[' ||
+      lexer->lookahead == ':' ||
+      lexer->lookahead == '-' ||
+      iswalnum(lexer->lookahead)
+    ) {
+      lexer->result_symbol = DESCENDANT_OP;
+      return true;
+    }
+  }
+
+  return false;
+}