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< ul class = "crumbs" > < li > < a href = "../webs.html" > Source< / a > < / li > < li > < a href = "../compiler.html" > Compiler Modules< / a > < / li > < li > < a href = "index.html" > inbuild< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: Incremental Builds< / a > < / li > < li > < b > Build Scripts< / b > < / li > < / ul > < p class = "purpose" > Scripts are nothing more than lists of build steps.< / p >
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< ul class = "toc" > < li > < a href = "#SP1" > § 1. Build scripts< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "inwebparagraph" > < a id = "SP1" > < / a > < b > § 1. Build scripts. < / b > Suppose the incremental build algorithm has decided it wants to build node
< code class = "display" > < span class = "extract" > V< / span > < / code > in the graph: it does so by calling < code class = "display" > < span class = "extract" > BuildScripts::execute< / span > < / code > on the script
attached to < code class = "display" > < span class = "extract" > V< / span > < / code > . This is only a list of steps:
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< / p >
< pre class = "display" >
< span class = "reserved" > typedef< / span > < span class = "plain" > < / span > < span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "reserved" > build_script< / span > < span class = "plain" > {< / span >
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< span class = "reserved" > struct< / span > < span class = "plain" > < / span > < span class = "identifier" > linked_list< / span > < span class = "plain" > *< / span > < span class = "identifier" > steps< / span > < span class = "plain" > ; < / span > < span class = "comment" > of < code class = "display" > < span class = "extract" > build_step< / span > < / code > < / span >
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< span class = "identifier" > MEMORY_MANAGEMENT< / span >
< span class = "plain" > } < / span > < span class = "reserved" > build_script< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > build_script< / span > < span class = "plain" > *< / span > < span class = "functiontext" > BuildScripts::new< / span > < span class = "plain" > (< / span > < span class = "reserved" > void< / span > < span class = "plain" > ) {< / span >
< span class = "reserved" > build_script< / span > < span class = "plain" > *< / span > < span class = "identifier" > BS< / span > < span class = "plain" > = < / span > < span class = "identifier" > CREATE< / span > < span class = "plain" > (< / span > < span class = "reserved" > build_script< / span > < span class = "plain" > );< / span >
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< span class = "identifier" > BS< / span > < span class = "plain" > -> < / span > < span class = "element" > steps< / span > < span class = "plain" > = < / span > < span class = "identifier" > NEW_LINKED_LIST< / span > < span class = "plain" > (< / span > < span class = "reserved" > build_step< / span > < span class = "plain" > );< / span >
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< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > BS< / span > < span class = "plain" > ;< / span >
< span class = "plain" > }< / span >
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< span class = "reserved" > void< / span > < span class = "plain" > < / span > < span class = "functiontext" > BuildScripts::add_step< / span > < span class = "plain" > (< / span > < span class = "reserved" > build_script< / span > < span class = "plain" > *< / span > < span class = "identifier" > BS< / span > < span class = "plain" > , < / span > < span class = "reserved" > build_step< / span > < span class = "plain" > *< / span > < span class = "identifier" > S< / span > < span class = "plain" > ) {< / span >
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< span class = "identifier" > ADD_TO_LINKED_LIST< / span > < span class = "plain" > (< / span > < span class = "identifier" > S< / span > < span class = "plain" > , < / span > < span class = "reserved" > build_step< / span > < span class = "plain" > , < / span > < span class = "identifier" > BS< / span > < span class = "plain" > -> < / span > < span class = "element" > steps< / span > < span class = "plain" > );< / span >
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< span class = "plain" > }< / span >
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< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "functiontext" > BuildScripts::script_length< / span > < span class = "plain" > (< / span > < span class = "reserved" > build_script< / span > < span class = "plain" > *< / span > < span class = "identifier" > BS< / span > < span class = "plain" > ) {< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > BS< / span > < span class = "plain" > == < / span > < span class = "identifier" > NULL< / span > < span class = "plain" > ) < / span > < span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "constant" > 0< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > LinkedLists::len< / span > < span class = "plain" > (< / span > < span class = "identifier" > BS< / span > < span class = "plain" > -> < / span > < span class = "element" > steps< / span > < span class = "plain" > );< / span >
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< span class = "plain" > }< / span >
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< / pre >
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< p class = "inwebparagraph" > < / p >
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< p class = "endnote" > The function BuildScripts::new is used in 3/bg (< a href = "3-bg.html#SP2" > § 2< / a > ).< / p >
< p class = "endnote" > The function BuildScripts::add_step is used in 3/bs2 (< a href = "3-bs2.html#SP4" > § 4< / a > ).< / p >
< p class = "endnote" > The function BuildScripts::script_length is used in 3/bg (< a href = "3-bg.html#SP5" > § 5< / a > ).< / p >
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< p class = "endnote" > The structure build_script is private to this section.< / p >
< p class = "inwebparagraph" > < a id = "SP2" > < / a > < b > § 2. < / b > We execute the steps in sequence, of course. As soon as any step fails,
returning < code class = "display" > < span class = "extract" > FALSE< / span > < / code > , the script halts and returns < code class = "display" > < span class = "extract" > FALSE< / span > < / code > . An empty script
always succeeds and returns < code class = "display" > < span class = "extract" > TRUE< / span > < / code > .
< / p >
< pre class = "display" >
< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "functiontext" > BuildScripts::execute< / span > < span class = "plain" > (< / span > < span class = "reserved" > build_vertex< / span > < span class = "plain" > *< / span > < span class = "identifier" > V< / span > < span class = "plain" > , < / span > < span class = "reserved" > build_script< / span > < span class = "plain" > *< / span > < span class = "identifier" > BS< / span > < span class = "plain" > , < / span > < span class = "reserved" > build_methodology< / span > < span class = "plain" > *< / span > < span class = "identifier" > BM< / span > < span class = "plain" > ) {< / span >
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< span class = "reserved" > int< / span > < span class = "plain" > < / span > < span class = "identifier" > rv< / span > < span class = "plain" > = < / span > < span class = "identifier" > TRUE< / span > < span class = "plain" > ;< / span >
< span class = "reserved" > build_step< / span > < span class = "plain" > *< / span > < span class = "identifier" > S< / span > < span class = "plain" > ;< / span >
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< span class = "identifier" > LOOP_OVER_LINKED_LIST< / span > < span class = "plain" > (< / span > < span class = "identifier" > S< / span > < span class = "plain" > , < / span > < span class = "reserved" > build_step< / span > < span class = "plain" > , < / span > < span class = "identifier" > BS< / span > < span class = "plain" > -> < / span > < span class = "element" > steps< / span > < span class = "plain" > )< / span >
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< span class = "reserved" > if< / span > < span class = "plain" > (< / span > < span class = "identifier" > rv< / span > < span class = "plain" > )< / span >
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< span class = "identifier" > rv< / span > < span class = "plain" > = < / span > < span class = "functiontext" > BuildSteps::execute< / span > < span class = "plain" > (< / span > < span class = "identifier" > V< / span > < span class = "plain" > , < / span > < span class = "identifier" > S< / span > < span class = "plain" > , < / span > < span class = "identifier" > BM< / span > < span class = "plain" > );< / span >
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< span class = "reserved" > return< / span > < span class = "plain" > < / span > < span class = "identifier" > rv< / span > < span class = "plain" > ;< / span >
< span class = "plain" > }< / span >
< / pre >
< p class = "inwebparagraph" > < / p >
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< p class = "endnote" > The function BuildScripts::execute is used in 3/ib (< a href = "3-ib.html#SP7_1_3" > § 7.1.3< / a > ).< / p >
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< hr class = "tocbar" >
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< ul class = "toc" > < li > < a href = "3-ib.html" > Back to 'Incremental Building'< / a > < / li > < li > < a href = "3-bs2.html" > Continue with 'Build Steps'< / a > < / li > < / ul > < hr class = "tocbar" >
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