1 files changed, 117 insertions, 0 deletions
diff --git a/qls/parser/lexer.py b/qls/parser/lexer.py
new file mode 100644
index 0000000..f7b8b98
--- /dev/null
+++ b/qls/parser/lexer.py
@@ -0,0 +1,117 @@
+from ply.lex import lex
+
+
+class QLSLexer:
+    def __init__(self):
+        self.__errors = []
+        self.__lexer = None
+
+    @property
+    def lexer(self):
+        return self.__lexer
+
+    @property
+    def errors(self):
+        return self.__errors
+
+    def build(self):
+        self.__lexer = lex(module=self)
+
+    def tokenize(self, data):
+        self.__errors = []
+        self.lexer.input(data)
+        token = self.lexer.token()
+        tokens = [token]
+
+        while token:
+            token = self.lexer.token()
+            tokens.append(token)
+
+        return tokens
+
+    tokens = [
+        'COLON', 'COMMA',
+        'LEFT_BRACE', 'RIGHT_BRACE',
+        'LEFT_BRACKET', 'RIGHT_BRACKET',
+        'IDENTIFIER',
+        'HEX_COLOR',
+        'INTEGER_LITERAL', 'STRING_LITERAL',
+    ]
+
+    # List of reserved keywords
+    reserved = {
+        'stylesheet':   'STYLESHEET',
+        'page':         'PAGE',
+        'section':      'SECTION',
+        'question':     'QUESTION',
+        'default':      'DEFAULT',
+
+        # Properties
+        'height':       'HEIGHT',
+        'width':        'WIDTH',
+        'font':         'FONT',
+        'fontsize':     'FONT_SIZE',
+        'color':        'COLOR',
+        'widget':       'WIDGET',
+
+        # QL types
+        'boolean':      'BOOLEAN',
+        'date':         'DATE',
+        'decimal':      'DECIMAL',
+        'integer':      'INTEGER',
+        'money':        'MONEY',
+        'string':       'STRING',
+
+        # Widgets
+        'calendar':     'CALENDAR',
+        'checkbox':     'CHECKBOX',
+        'line_edit':    'LINE_EDIT',
+        'spinbox':      'SPINBOX',
+        'radio':        'RADIO',
+    }
+
+    tokens += list(reserved.values())
+
+    # Regular expression rules for simple tokens
+    t_ignore = ' \t'
+
+    t_COLON = r':'
+    t_COMMA = r','
+
+    t_LEFT_BRACE = r'\{'
+    t_RIGHT_BRACE = r'\}'
+
+    t_LEFT_BRACKET = r'\('
+    t_RIGHT_BRACKET = r'\)'
+
+    t_HEX_COLOR = r'\#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})'
+
+    @staticmethod
+    def t_newline(token):
+        r'\n+'
+        token.lexer.lineno += len(token.value)
+
+    @staticmethod
+    def t_eof(token):
+        token.lexer.lineno = 1
+
+    @staticmethod
+    def t_INTEGER_LITERAL(token):
+        r'\d+'
+        token.value = int(token.value)
+        return token
+
+    @staticmethod
+    def t_STRING_LITERAL(token):
+        r'\"(.+?)\"'
+        token.value = token.value[1:-1]
+        return token
+
+    def t_IDENTIFIER(self, token):
+        r'[a-zA-Z][a-zA-Z_0-9]*'
+        token.type = self.reserved.get(token.value, 'IDENTIFIER')  # Check for reserved words
+        return token
+
+    def t_error(self, token):
+        self.errors.append("Illegal character '%s'" % token.value[0])
+        token.lexer.skip(1)