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Tweak: execution instead of evaluation

This commit is contained in:
Tony Garnock-Jones 2022-02-25 14:49:24 +01:00
parent f11cacf513
commit 808b991a35
1 changed files with 9 additions and 9 deletions
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18
src/operation/scripting.md
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@ -120,7 +120,7 @@ the contents of a variable, use the `+=` form of *AssertionInstruction*.
    `<`*ValueExpr*` `*ValueExpr*...`>` |
    `{`*ValueExpr*`:`*ValueExpr*` `...`}`
The most general form of *AssertionInstruction* is "`+= `*ValueExpr*". When evaluated, the
The most general form of *AssertionInstruction* is "`+= `*ValueExpr*". When executed, the
result of evaluating *ValueExpr* will be published (asserted) at the entity denoted by the
active target register.
@ -131,7 +131,7 @@ As a convenient shorthand, the compiler also interprets every Preserves record o
*SendInstruction* = `! `*ValueExpr*
When evaluated, the result of evaluating *ValueExpr* will be sent as a message to the entity
When executed, the result of evaluating *ValueExpr* will be sent as a message to the entity
denoted by the active target register.
### Reacting to events
@ -183,10 +183,10 @@ facet terminates, *Instruction* is run.
    *ValueExpr*
Values can be destructured and new variables introduced into the environment with `let`, which
is a "destructuring bind" or "pattern-match definition" statement. When evaluated, the result
of evaluating *ConvenienceExpr* is matched against the result of evaluating *PatternExpr*. If
the match fails, the actor crashes. If the match succeeds, the resulting binding variables (if
any) are introduced into the environment.
is a "destructuring bind" or "pattern-match definition" statement. When executed, the result of
evaluating *ConvenienceExpr* is matched against the result of evaluating *PatternExpr*. If the
match fails, the actor crashes. If the match succeeds, the resulting binding variables (if any)
are introduced into the environment.
The right-hand-side of a `let`, after the equals sign, is either a normal *ValueExpr* or one of
the following special "convenience" expressions:
@ -200,15 +200,15 @@ the following special "convenience" expressions:
`stop` to the entity (using e.g. the *SendInstruction* "`! stop`") triggers termination of
its associated facet. The entity does not respond to any other assertion or message.
### Conditional evaluation
### Conditional execution
*ConditionalInstruction* = `$`*var*` =~ `*PatternExpr*` `*Instruction*` `*Instruction* ...
When evaluated, the value in variable *var* is matched against the result of evaluating
When executed, the value in variable *var* is matched against the result of evaluating
*PatternExpr*.
- If the match succeeds, the resulting bound variables are placed in the environment and
evaluation continues with the first *Instruction*. The subsequent *Instruction*s are not
execution continues with the first *Instruction*. The subsequent *Instruction*s are not
executed in this case.
- If the match fails, then the first *Instruction* is skipped, and the subsequent