Squashed 'docs/standards/playbook/' changes from c3f8137..25d895d

25d895d 🐛 fix(gitea_workflow): clean up temp repos after job steps
2bc3b11 🐛 fix(gitea_workflow): clean up temporary repo dirs in workflows
98c3f30 📝 docs(agent_rules): allow plan execution on current branch
16c7230 📝 docs(prompts): define custom verify layering
8efc4dd 🐛 fix(skills): quote commit-message description
bc8498f 🐛 fix(ci): install tomli for gitea tests
55cda3b 🐛 fix(tests): report missing toml parser clearly
c0729c7 🐛 fix(playbook): import Optional for cli compatibility
63e24bf 📦 deps(skills): sync thirdparty skills
d2f9356 🐛 fix(ci): isolate gitea workflow repos
588b81d 🐛 fix(ci): inline gitea workflow bootstrap
e0b1c3a ♻️ refactor(skills): standardize first-party skill contracts
2c5050d ♻️ refactor(skills): rename repo skills source dir
f049dfb 📦 deps(skills): drop duplicate first-party superpowers skills
234b335  feat(workflow): add superpowers planning and execution state tracking
c1702a6 📝 docs(markdown): format tracked markdown and drop stale templates
2325409 📝 docs(markdown): clarify optional markdownlint usage
214c44e 🔧 chore(markdown): add markdownlint baseline and lint fixes
a22b324 📝 docs(templates): add execution and memory-bank prompt templates
223a797 📝 docs(templates): update README for Claude Code and current features
4ac8672 📝 docs: simplify README + platform-agnostic tools + auto-create local rules
2431c9d 📝 docs: add claude_md config and use cross-platform paths
d64b248 📝 docs: fix README.md inaccuracies and add Claude Code info
c8d6bf2 🐛 fix(playbook): use relative paths in CLAUDE.md when not at project root
6518f0f  feat(playbook): auto-create CLAUDE.md with path discovery
6ec9a45  feat(skills): add skill_link symlink support + platform-agnostic prompt
9f8b6b5 📝 docs: update README and config example for Claude Code support
79cff6c 📝 docs(skills): add Claude Code platform support
452c6f5  feat(playbook): auto-inject AGENTS.md into CLAUDE.md
e1dbf3c 🐛 fix(skills): remove dual-path from commit-message skill
f3a7259 🔧 chore(ci): use prepare_repo.sh in both workflows
da08212 🔧 chore(ci): extract prepare_repo.sh and clean up workflows
7ade85e 🗑️ remove(tsl): drop syntax_book/, data/ source and build script
f94dba0 ♻️ refactor(skills): update playbook.py and tests for thirdparty/ layout
b3df412 ♻️ refactor(skills): separate thirdparty skills into thirdparty/ subdirectory
64950e7 📦 deps(skills): sync thirdparty skills
a2e3cb0  feat(playbook): add no_backup deploy controls
8609d59 🐛 fix(docs): repair reference catalog source links
956da11 🐛 fix(playbook): publish hidden ci test fixes
3f67754 📦 deps(skills): sync thirdparty skills
08ca87b 📦 deps(skills): add karpathy thirdparty sync
96b705b 📝 docs(tsl): rebuild canonical syntax and routing manual
3ed5052 📦 deps(skills): sync thirdparty skills
60108dd 📦 deps(skills): sync thirdparty skills
da85d4e 🐛 fix(thirdparty): prune nested project snapshots
a2a697e 📦 deps(skills): sync thirdparty skills
9df610a 🐛 fix(thirdparty): exclude duplicated superpowers skills
33dd5bb 🐛 fix(thirdparty): preserve optional manifest fields
91b0ea7 🐛 fix(thirdparty): preserve manifest during snapshot update
2e26f98 🔧 chore(thirdparty): generalize skills sync pipeline
5b9c1e3 📦 deps(skills): sync superpowers
2f2d34a 📝 docs(readme): normalize subtree command spacing
62db7db 🐛 fix(ci): serialize superpowers update and sync
3463223 🐛 fix(ci): use literal superpowers sync paths
48f6de8 📦 deps(skills): sync superpowers
4b23529 🔧 chore(ci): merge superpowers update and sync workflow
a56d75b 📦 deps(skills): sync superpowers
84bcefa 🔧 chore(ci): use ci[bot] commit author name
00a07e5 📦 deps(skills): sync superpowers
7b84daf 🐛 fix(templates): enforce main loop progress tracking
51373d7 🔧 chore(ci): automate superpowers sync workflow
eaaa39c 🐛 fix(ci): prevent stale superpowers sync from restoring skills block
79755c6 📦 deps(skills): sync superpowers
836d878 📦 deps(skills): sync superpowers
8216c9f 📦 deps(skills): sync superpowers
9439505 🐛 fix(playbook): address reported repo issues

git-subtree-dir: docs/standards/playbook
git-subtree-split: 25d895d8b3f56624ccfe99ad7289e9eb49e0f316
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# Variables And Constants
文档类型:语法主线
是否可直接用于生成代码:是
是否含已验证可执行示例:是
是否含已验证反例:是
遇到不确定时跳转到:[04_values_and_literals.md](04_values_and_literals.md)、[06_functions_and_calls.md](06_functions_and_calls.md)、[12_pitfalls.md](12_pitfalls.md)
手册位置:第 5 篇,共 32 篇。上一篇:[04_values_and_literals.md](04_values_and_literals.md)。下一篇:[06_functions_and_calls.md](06_functions_and_calls.md)。
这一篇收拢变量、常量与两种常量写法。
## 这一篇解决什么问题
回答“普通变量怎样直接使用、`var` 在什么位置出现、常量有哪些基本写法、哪些名字一旦绑定就不能再赋值”。
## 必须记住的规则
- 默认变量模型是“直接赋值即得到变量”,不要求先写 `var`
- 例如:`a := 1; b := array(1, 2, 3);` 这种写法已验证可直接编译。
- `var name;` 目前只能当成一种显式声明写法,不能当成默认必需步骤。
- `const Name = value;``const name := value;` 不能当成完全等价的两种写法。
- 已验证:
- `const Name = value;` 适合函数内部 `const` 段、`unit` 接口常量、类成员常量。
- `const name := value;` 适合顶层直接写的常量,单独成段也能编译。
- 当前已验证:函数内部 `const = expr`、以及松散脚本顶层的 `const = expr` / `const := expr`,都可以把右侧写成常量表达式。
- 这两种常量在当前解释器里都不能再次赋值。
- 当前解释器接受多参数赋值:`[a, b] := array(...)`
- 左侧只有一个变量时,末尾逗号不能省略,必须写成 `[a, ] := array(...)`
- 当左侧变量数大于右侧数组长度时,多出的变量会得到 `nil`
- 右侧数组元素也可以是数组;拆出来的变量会直接得到对应子数组。
- 多参数赋值也可以出现在函数调用参数里。
- 截至 `2026-04-15` 的最小验证里,`{$Explicit+}` 开启后,后续变量必须先用 `var` 声明;未声明变量会报 `variable not defined`
## 已验证语法
默认变量模型:
代码块身份:已验证可执行示例
```tsl
a := 1;
b := array(1, 2, 3);
```
显式 `var` 写法:
代码块身份:已验证可执行示例
```tsl
var a;
a := 1;
```
`{$Explicit+}` 下的显式声明:
代码块身份:已验证可执行示例
```tsl
program test;
begin
{$Explicit+}
var a;
a := 1;
WriteLn(a);
end.
```
顶层最稳的常量写法:
代码块身份:已验证可执行示例
```tsl
const value := 1;
```
顶层 `const :=` 也可以写常量表达式:
代码块身份:已验证可执行示例
```tsl
const value := 1 + 2 * 3;
WriteLn(value);
```
函数内部 `const` 段:
代码块身份:已验证可执行示例
```tsl
function Demo();
const MaxRetries = 1 + 2 * 3;
begin
return MaxRetries;
end;
```
`unit` 接口常量:
代码块身份:已验证可执行示例
```tsl
unit DemoUnit;
interface
const value = 1;
function GetValue();
implementation
function GetValue();
begin
return value;
end;
end.
```
类成员常量:
代码块身份:已验证可执行示例
```tsl
type DemoType = class
const value = 1;
end;
```
顶层 `const =` 只有在“后面继续接可执行语句”的脚本模型里才已验证成立:
代码块身份:已验证可执行示例
```tsl
const MaxRetries = 3 + 4;
value := MaxRetries;
```
代码块身份:已验证可执行示例
```tsl
var a;
a := 1;
```
多参数赋值:
代码块身份:已验证可执行示例
```tsl
[r1, r2] := array(1, 3, 5, 7, 9);
WriteLn(r1);
WriteLn(r2);
```
已验证运行结果:
- 依次输出 `1``3`
单变量拆包时,末尾逗号不能省略:
代码块身份:已验证可执行示例
```tsl
[re, ] := array(1, 2, 3, 4);
WriteLn(re);
```
已验证运行结果:
- 输出 `1`
左侧变量比右侧数组更长时,多出的变量为 `nil`
代码块身份:已验证可执行示例
```tsl
[r1, r2] := array(1);
WriteLn(r1);
WriteLn(r2 = nil);
```
已验证运行结果:
- `r1` 输出 `1`
- `r2 = nil` 输出 `1`
右侧元素也可以是数组:
代码块身份:已验证可执行示例
```tsl
[r1, r2] := array((1, 2), (3, 4));
WriteLn(r1[0]);
WriteLn(r1[1]);
WriteLn(r2[0]);
WriteLn(r2[1]);
```
已验证运行结果:
- 依次输出 `1``2``3``4`
函数返回数组后也可以直接拆包:
代码块身份:已验证可执行示例
```tsl
program test;
function PairAdd(a, b);
begin
return array(0, a + b);
end;
begin
[error, re] := PairAdd(3, 4);
WriteLn(error);
WriteLn(re);
end.
```
已验证运行结果:
- 依次输出 `0``7`
函数参数里也可以使用多参数赋值:
代码块身份:已验证可执行示例
```tsl
program test;
function Test(a, b, c);
begin
return a + b + c;
end;
begin
WriteLn(Test(e := 3, [f, g] := array(1, 2), g));
end.
```
已验证运行结果:
- 输出 `6`
## 最小可编译示例
如果你只是想先落一个可续写的普通变量和顶层常量骨架,用下面这组:
代码块身份:已验证可执行示例
```tsl
const MaxRetries := 3;
counter := MaxRetries;
items := array(1, 2, 3);
```
## 常见误写
- 以为普通变量必须先写 `var` 才能使用。
- 以为 `const =``const :=` 只是初始化方式不同,可以在任何上下文里互换。
- 以为 `const =` 顶层单独写一行就一定成立。
- 以为单变量拆包可以写成 `[a] := array(...)`
- 以为 `{$Explicit+}` 开启后仍然可以继续直接写未声明变量。
代码块身份:反例 / 不可照写
```text
const value := 1;
value := 2;
```
上面这类写法会编译失败,报错点在重新赋值这一行。
代码块身份:反例 / 不可照写
```text
const value = 1;
```
上面这类“顶层单独一行”的 `const =` 在当前解释器里也会编译失败。
代码块身份:反例 / 不可照写
```text
[re] := array(1, 2, 3);
```
上面这种单变量拆包写法在当前解释器里会报 `left side can not be assign to`。单变量时必须写成 `[re, ] := ...`
代码块身份:反例 / 不可照写
```text
program test;
begin
{$Explicit+}
a := 1;
end.
```
上面这类写法在当前解释器里会编译失败,主因是 `variable not defined`
## 跳转指引
- 回看基本类型:见 [04_values_and_literals.md](04_values_and_literals.md)
- 进入表达式:见 [07_expressions_and_operators.md](07_expressions_and_operators.md)
- 看词法和编译选项:见 [18_lexical_structure_and_compile_options.md](18_lexical_structure_and_compile_options.md)
- 看类型与转换:见 [19_types_and_conversions.md](19_types_and_conversions.md)