Fixed compiler improvements and added comprehensive test suite

- Fixed makefile preprocessor macro definitions (removed spaces in -D flags)
- Added null pointer check in compiler class declaration handling
- Added comprehensive test specifications for various language features:
  - attrib, backcall, cond, config, existential, export, goto
  - import, literals, macro, metatable, operators, return
  - string, switch, vararg, with

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/spec/inputs/test/string_spec.yue b/spec/inputs/test/string_spec.yue
new file mode 100644
index 0000000..b790518
--- /dev/null
+++ b/spec/inputs/test/string_spec.yue
@@ -0,0 +1,143 @@
+describe "string", ->
+        it "should support single quote strings", ->
+                s = 'hello'
+                assert.same s, "hello"
+
+        it "should support double quote strings", ->
+                s = "world"
+                assert.same s, "world"
+
+        it "should support escape sequences", ->
+                s = "hello\nworld"
+                assert.is_true s\match("\n") ~= nil
+
+        it "should support escaped quotes", ->
+                s = "he said \"hello\""
+                assert.same s, 'he said "hello"'
+
+        it "should support backslash escape", ->
+                s = "\\"
+                assert.same s, "\\"
+
+        it "should support multi-line strings with [[ ]]", ->
+                s = [[
+                        hello
+                        world
+                ]]
+                assert.is_true s\match("hello") ~= nil
+                assert.is_true s\match("world") ~= nil
+
+        it "should support multi-line strings with [=[ ]=]", ->
+                s = [==[
+                        hello
+                        world
+                ]==]
+                assert.is_true s\match("hello") ~= nil
+                assert.is_true s\match("world") ~= nil
+
+        it "should support string interpolation with double quotes", ->
+                name = "world"
+                s = "hello #{name}"
+                assert.same s, "hello world"
+
+        it "should support expression interpolation", ->
+                a, b = 1, 2
+                s = "#{a} + #{b} = #{a + b}"
+                assert.same s, "1 + 2 = 3"
+
+        it "should not interpolate in single quotes", ->
+                name = "world"
+                s = 'hello #{name}'
+                assert.same s, "hello #{name}"
+
+        it "should escape interpolation with \\#", ->
+                name = "world"
+                s = "hello \\#{name}"
+                assert.same s, "hello #{name}"
+
+        it "should support method calls on string literals", ->
+                result = "hello"\upper!
+                assert.same result, "HELLO"
+
+        it "should support chained method calls", ->
+                result = "hello world"\upper!\match "HELLO"
+                assert.same result, "HELLO"
+
+        it "should support YAML style strings", ->
+                s = |
+                        hello
+                        world
+                assert.is_true s\match("hello") ~= nil
+                assert.is_true s\match("world") ~= nil
+
+        it "should support YAML style with interpolation", ->
+                name = "test"
+                s = |
+                        hello #{name}
+                assert.same s, "hello test\n"
+
+        it "should support string concatenation", ->
+                s = "hello" .. " " .. "world"
+                assert.same s, "hello world"
+
+        it "should handle empty strings", ->
+                s = ""
+                assert.same s, ""
+
+        it "should support Unicode characters", ->
+                s = "hello 世界"
+                assert.is_true s\match("世界") ~= nil
+
+        it "should support string length", ->
+                s = "hello"
+                assert.same #s, 5
+
+        it "should support multi-line YAML with complex content", ->
+                config = |
+                        key1: value1
+                        key2: value2
+                        key3: value3
+                assert.is_true config\match("key1") ~= nil
+
+        it "should support interpolation in YAML strings", ->
+                x, y = 10, 20
+                s = |
+                        point:
+                                x: #{x}
+                                y: #{y}
+                assert.is_true s\match("x: 10") ~= nil
+                assert.is_true s\match("y: 20") ~= nil
+
+        it "should support function call in interpolation", ->
+                s = "result: #{-> 42}"
+                assert.same s, "result: 42"
+
+        it "should support table indexing in interpolation", ->
+                t = {value: 100}
+                s = "value: #{t.value}"
+                assert.same s, "value: 100"
+
+        it "should handle escaped characters correctly", ->
+                s = "tab:\t, newline:\n, return:\r"
+                assert.is_true s\match("\t") ~= nil
+                assert.is_true s\match("\n") ~= nil
+
+        it "should support string methods with colon syntax", ->
+                s = "hello"
+                assert.same s\sub(1, 2), "he"
+
+        it "should work in expressions", ->
+                result = "hello" .. " world"
+                assert.same result, "hello world"
+
+        it "should support octal escape", ->
+                s = "\65"
+                assert.same s, "A"
+
+        it "should support hex escape", ->
+                s = "\x41"
+                assert.same s, "A"
+
+        it "should support unicode escape", ->
+                s = "\u{4e16}"
+                assert.same s, "世"